U.S. patent application number 10/843702 was filed with the patent office on 2005-11-10 for devices and methods for retaining a gastro-esophageal implant.
Invention is credited to Athas, William L., Balbierz, Dan, Eubanks, William S. JR., Glenn, Richard A., Kouri, Richard, Lunsford, John, Stack, Richard S., van Bladel, Kevin.
Application Number | 20050247320 10/843702 |
Document ID | / |
Family ID | 34468360 |
Filed Date | 2005-11-10 |
United States Patent
Application |
20050247320 |
Kind Code |
A1 |
Stack, Richard S. ; et
al. |
November 10, 2005 |
Devices and methods for retaining a gastro-esophageal implant
Abstract
Various methods and devices are described for retaining a
medical implant within a body cavity. According to one aspect, at
least a portion of a medical implant is positioned within a body
cavity, and a wall of the body cavity is re-shaped such that the
re-shaped wall prevents migration of the medical implant out of the
body cavity. The re-shaped body wall may form a tissue pocket,
tunnel, or other barrier against migration of the implant.
Inventors: |
Stack, Richard S.; (Chapel
Hill, NC) ; Balbierz, Dan; (Redwood City, CA)
; Lunsford, John; (San Carlos, CA) ; van Bladel,
Kevin; (Livermore, CA) ; Eubanks, William S. JR.;
(Columbia, MO) ; Athas, William L.; (Chapel Hill,
NC) ; Glenn, Richard A.; (Santa Rosa, CA) ;
Kouri, Richard; (Raleigh, NC) |
Correspondence
Address: |
STALLMAN & POLLOCK LLP
Attn: Kathleen A. Frost
Suite 2200
353 Sacramento Street
San Francisco
CA
94111
US
|
Family ID: |
34468360 |
Appl. No.: |
10/843702 |
Filed: |
May 11, 2004 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
60510268 |
Oct 10, 2003 |
|
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Current U.S.
Class: |
128/898 ;
606/198 |
Current CPC
Class: |
A61B 17/07292 20130101;
A61B 17/0686 20130101; A61B 2017/0641 20130101; A61B 17/0469
20130101; A61B 2017/0464 20130101; A61F 5/0083 20130101; A61F
5/0079 20130101; A61B 2017/306 20130101; A61B 17/0644 20130101;
A61F 2/848 20130101; A61M 29/00 20130101; A61B 2017/0458 20130101;
A61B 2017/0419 20130101; A61B 17/072 20130101; A61B 2017/301
20130101; A61B 2017/0454 20130101; A61B 2017/0417 20130101; A61B
17/08 20130101; A61B 2017/0647 20130101; A61F 5/0076 20130101 |
Class at
Publication: |
128/898 ;
606/198 |
International
Class: |
A61B 017/08; A61B
001/00; A61M 029/00; A61B 019/00 |
Claims
We claim:
1. A method of retaining a medical implant within a body cavity,
the method comprising the steps of: providing a medical implant;
forming a tissue pocket on a wall of a body cavity, said tissue
pocket having a first opening exposed to the interior of the body
cavity; and retaining at least a portion of the medical implant
within the tissue pocket.
2. The method according to claim 1, wherein the forming step
includes the step of attaching regions of body tissue on the wall
of the body cavity.
3. The method according to claim 1 wherein the method includes
forming the tissue pocket and then inserting the portion of the
medical implant into the tissue pocket.
4. The method according to claim 1 wherein the method includes
placing the portion of the medical implant into contact with the
wall and forming the tissue pocket around the portion of the
medical implant.
5. The method according to claim 1 wherein: the tissue pocket
includes a second opening; the retaining step includes positioning
the medical implant such that a first portion of the medical
implant extends from the first opening and a second portion of the
medical implant extends from the second opening; and the second
portion of the medical implant includes a retention element
proportioned to resist passage of the retention element through the
second opening during the retaining step.
6. The method according to claim 5 wherein the positioning step
includes expanding the retention element to prevent release of the
medical implant from the tissue pocket.
7. The method according to claim 6 wherein the expanding step
includes inflating the retention element.
8. The method according to claim 5 wherein the positioning step
includes deforming the retention element to prevent release of the
medical implant from the tissue pocket.
9. The method according to claim 5 wherein: the method provides the
medical implant to include a leg member retainable within the
tissue pocket, wherein the retention element is positioned on the
leg member.
10. The method according to claim 5 wherein the retention element
is a clip and the positioning step positions the clip to extend
through the first and second openings.
11. The method according to claim 1 wherein the medical implant is
retained within the tissue pocket without the use of a fastener
that both physically penetrates body tissue and is physically
connected to the medical implant.
12. The method of claim 2, further including the step of causing
the attached regions of tissue to adhere to one another.
13. The method according to claim 2 wherein the body cavity is a
stomach having an interior and an exterior, and wherein the
attaching step attaches regions of tissue such that serosal tissue
from a first region and serosal tissue from a second region are in
contact with one another.
14. The method according to claim 13, further including the step of
causing the attached regions of serosal tissue to adhere to one
together to form a tissue adhesion.
15. The method according to claim 2 wherein the body cavity is a
stomach having an interior and an exterior, and wherein the
attaching step attaches interior regions of tissue.
16. The method according to claim 15 wherein the attached interior
regions of tissue comprise mucosal tissue.
17. The method according to claim 1, wherein the body cavity is a
stomach and the method forms the tissue pocket accessible from the
stomach interior.
18. The method according to claim 2, wherein the body cavity is a
stomach and the regions of body tissue are on the exterior surface
of the stomach.
19. The method according to claim 18 wherein the attaching step
includes attaching the regions to form a fully-enclosed tissue
pocket, and forming the at least one opening in the tissue
pocket.
20. The method according to claim 18 wherein: the method includes
drawing exterior stomach tissue into apposition to form a tissue
fold; the method includes forming a cut in the tissue fold to
create a window therein; and the attaching step includes attaching
opposed layers of tissue surrounding the window, wherein the tissue
pocket extends between the opposed layers of tissue bordered by the
cut.
21. The method according to claim 18, wherein: the method includes
drawing exterior stomach tissue into apposition to form a stomach
fold; the attaching step includes forming a hole extending through
the stomach fold and attaching opposed layers of tissue in the
region surrounding the hole; and the tissue pocket comprises the
hole extending through the opposed layers of tissue.
22. The method according to claim 2 wherein the attaching step
attaches the regions of body tissue together using suture.
23. The method according to claim 2 wherein the attaching step
attaches the regions of body tissue together using staples.
24. The method according to claim 2 wherein the attaching step
attaches the regions of body tissue together using clips.
25. The method according to claim 2 wherein the attaching step
attaches the regions of body tissue together using adhesives.
26. The method according to claim 2 wherein the method includes
modifying at least one of the regions of body tissue prior to
attaching the regions into contact with one another.
27. The method of claim 26 wherein the modifying step includes
ablating at least one of the regions of body tissue.
28. The method of claim 26 wherein the modifying step includes
cutting at least one of the spaced apart regions of body
tissue.
29. The method of claim 28 wherein the cutting step includes
shaving a tissue layer from at least one of the regions of body
tissue.
30. The method according to claim 26 further including the step of
causing the regions of body tissue to adhere to one another.
31. The method according to claim 26 wherein at least one of the
regions of body tissue is mucosal tissue, and wherein the modifying
step includes removing a portion of the mucosal tissue to expose
underlying tissue layers.
32. The method according to claim 31 wherein the modifying step
exposes a submucosal tissue layer.
33. The method according to claim 31 wherein the modifying step
exposes a serosal tissue layer.
34. The method according to claim 31 wherein the modifying step
exposes a muscularis tissue layer.
35. The method according to claim 1 wherein the medical implant is
a drug delivery device.
36. The method according to claim 1 wherein the medical implant is
a diagnostic device.
37. The method according to claim 1 wherein the medical implant is
an anti-reflux device.
38. The method according to claim 1 wherein the body cavity is the
stomach and wherein the medical implant is a device for inducing
weight loss.
39. The method according to claim 38, wherein the medical implant
is an expandable space-occupier and wherein the method includes
expanding the space-occupier within the stomach to decrease the
effective volume of the stomach.
40. The method according to claim 38, wherein the medical implant
is a flow-restrictive device and wherein the method includes
positioning the flow-restrictive device to restrict the rate of
flow of food into the stomach.
41. The method according to claim 1, further including the step of
retaining the medical implant using a plurality of tissue pockets
formed in the body cavity.
42. The method according to claim 41 wherein the medical implant
includes a plurality of leg members, and wherein the method
includes the step of forming a plurality of tissue pockets in the
body cavity and retaining the leg members within the tissue
pockets.
43. The method according to claim 1 wherein the body cavity is a
stomach and wherein the tissue pocket is formed using instruments
passed into the stomach through the esophagus.
44. The method according to claim 43 wherein the body cavity is a
stomach and wherein the tissue pocket is formed only using
instruments passed into the stomach through the esophagus.
45. The method according to claim 1 wherein the body cavity is a
stomach and wherein the tissue pocket is formed using instruments
passed through the abdominal wall.
46. An obesity-controlling apparatus retainable in at least one
tissue pocket formed on a wall of a human stomach, the apparatus
comprising: a member proportioned to be retained within a tissue
pocket formed on a wall of a human stomach; and a weight-loss
component attached to the member.
47. The apparatus according to claim 46 wherein the weight-loss
component includes a restrictive device proportioned to effectively
narrow a passage from the esophagus into the stomach to thereby
restrict the rate at which food flows into the stomach.
48. The apparatus according to claim 46 wherein the weight-loss
component includes an expandable space-occupier device proportioned
to reduce the effective volume of the stomach.
49. The apparatus according to claim 46 wherein the weight-loss
component includes a drug-eluting device containing a
hunger-controlling agent.
50. The apparatus according to claim 46 wherein the member is
retainable within the tissue pocket in the absence of a fastener
attached to the apparatus that physically penetrates body
tissue.
51. The apparatus according to claim 46 wherein apparatus is
positionable in a human stomach in which tissue pockets have been
formed to include first and second openings, and wherein the member
includes a retention element proportioned to prevent movement of
the retention element through the second opening to prevent release
of the member from the tissue pocket.
52. The apparatus according to claim 51 wherein the retention
element is expandable to prevent release of the member from the
tissue pocket.
53. The apparatus according to claim 52 wherein the retention
element is inflatable.
54. The apparatus according to claim 52 wherein the retention
element is compressible to a reduced-diameter position.
55. The apparatus according to claim 51 wherein the retention
element is deformable to prevent release of the member from the
tissue pocket.
56. The apparatus according to claim 51 wherein the retention
element is a clip extendable through first and second openings of a
tissue pocket.
57. The apparatus according to claim 47 wherein the restrictive
device is a ring.
58. The apparatus according to claim 47 wherein the restrictive
device is a mesh screen.
59. The apparatus according to claim 47 wherein the restrictive
device is an inflatable balloon.
60. The apparatus according to claim 47 wherein the restrictive
device is a pouch.
61. The apparatus according to claim 46, including a plurality of
said members proportioned to be retained within a tissue pocket
formed by attaching tissue surfaces of a human stomach.
62. The apparatus according to claim 46 including at least three of
said members.
63. A medical implant system, comprising: an instrument insertable
into a body for attaching regions of body tissue on the wall of a
body cavity to form a tissue pocket; and a medical implant
positionable within the body cavity, the medical implant including
at least one portion proportioned for retention within a tissue
pocket formed in the body cavity.
64. The implant system according to claim 63 wherein the medical
implant is a drug delivery device.
65. The implant system according to claim 63 wherein the medical
implant is a diagnostic device.
66. The implant system according to claim 63 wherein the medical
implant is an anti-reflux device.
67. The implant system according to claim 63 wherein the medical
implant is positionable within a stomach for inducing weight
loss.
68. The implant system according to claim 63, wherein the medical
implant is an expandable space-occupier positionable within a
stomach to decrease the effective volume of the stomach.
69. The implant system according to claim 63, wherein the medical
implant is a flow-restrictive device positionable within a stomach
to restrict the rate of flow of food into the stomach.
70. The implant system according to claim 63 wherein the instrument
is a suturing instrument.
71. The implant system according to claim 63 wherein the instrument
is a stapling instrument.
72. The implant system according to claim 63 wherein the instrument
is a clip-applier.
73. The implant system according to claim 63 wherein the medical
implant includes a plurality of leg members proportioned to be
retained within a plurality of tissue pockets formed using the
instrument.
74. The implant system according to claim 63 wherein the medical
implant is retainable within the tissue pocket without the use of a
fastener that both physically penetrates body tissue and is
physically connected to the medical implant.
75. A method of retaining a medical implant within a body cavity
having a wall, comprising the steps of: positioning at least a
portion of a medical implant within a body cavity; and re-shaping a
wall of the body cavity such that the re-shaped wall prevents
migration of the medical implant out of the body cavity.
76. The method according to claim 75 wherein the re-shaped wall
prevents migration of the medical implant in the absence of a
fastener attached to the medical implant and physically penetrating
tissue of the wall.
77. The method according to claim 75 wherein the positioning step
is carried out prior to the re-shaping step.
78. The method according to claim 75 wherein the positioning step
is carried out after the re-shaping step.
79. The method according to claim 75 wherein the re-shaping step
includes forming a tissue pocket on the wall, wherein at least a
portion of the medical implant is retained within the tissue
pocket.
80. The method according to claim 75 wherein the re-shaping step
includes the step of positioning a re-shaping implant in contact
with the wall.
81. The method according to claim 80 wherein the re-shaping step
includes the step of positioning the re-shaping implant in contact
with an exterior surface of the wall.
82. The method according to claim 80 wherein the re-shaping step
includes the step of positioning the re-shaping device in contact
with an interior surface of the wall.
83. The method according to claim 80 wherein the re-shaping step
includes positioning a circumferential band in contact with the
wall.
84. The method according to claim 83 wherein the body cavity is a
stomach, and wherein the re-shaping step further includes the step
of positioning a re-shaping liner on an interior surface of the
stomach wall.
85. The method according to claim 84 wherein the liner includes a
neck portion, and wherein the re-shaping step further includes
positioning the circumferential band in contact with the wall such
that wall tissue is disposed between the neck portion and the
liner.
86. The method according to claim 75 wherein the re-shaping step
includes attaching regions of tissue together.
87. The method according to claim 86 wherein the attaching step
forms a tunnel and wherein the method includes positioning at least
a portion of the implant within the tunnel.
88. The method according to claim 87 wherein the implant includes
an expandable portion and wherein the positioning step includes
positioning the expandable portion into contact with tissue
surrounding the tunnel.
89. The method according to claim 87 wherein the body cavity is a
stomach and the attaching step forms a tunnel in the proximal
stomach, wherein the tunnel is at least partially contiguous with
the esophagus.
90. The method according to claim 85 wherein the attaching step
forms a barrier proportioned to obstruct passage of the implant
from one region of the body cavity into another region of the body
cavity.
91. The method according to claim 90 wherein the body cavity is a
stomach, and wherein the barrier prevents migration of the implant
towards the intestinal tract.
92. The method according claim 91 wherein the barrier is formed in
the proximal portion of the stomach and the positioning step
positions the implant between the barrier and the esophagus.
93. The method according to claim 74 wherein the medical implant is
an obstructive device positionable within a stomach.
94. The method according to claim 74 wherein the medical implant is
a restrictive device positionable within a stomach.
95. The method according to claim 74 wherein the medical implant is
an anti-reflux device positionable within a stomach.
96. The method according to claim 74 wherein the medical implant is
a drug-eluting device.
97. The method according to claim 75 wherein the medical implant is
a diagnostic device.
98. The method according to claim 74 wherein the medical implant is
a therapeutic device.
99. The method according to claim 19, further including the step of
forming a second opening in the tissue pouch.
100. The method according to claim 1 wherein the retaining step
retains the entire medical implant within the pocket.
101. The method according to claim 100, further including the step
of closing the opening after positioning the medical implant within
the pocket.
102. A method of attaching a medical implant to stomach tissue,
including the steps of: positioning a medical implant within
stomach having a wall; and attaching the medical implant to an
external reinforcement device positioned in contact with the
exterior surface of the wall using a connector extending through
the wall from the implant to the external reinforcement device.
103. The method according to claim 102 wherein the external
reinforcement device is a pledget.
104. The method according to claim 102 wherein the external
reinforcement device is a t-bar.
105. The method according to claim 102 wherein the external
reinforcement device is a band.
106. The method according to claim 102 wherein the external
reinforcement device is a patch of reinforcing material.
107. A method of positioning an implant within the stomach,
comprising the steps of: forming a plurality of plications in a
wall of a stomach to form at least one tissue ridge; and
positioning an implant in contact with the tissue ridge.
108. The method according to claim 107 wherein the forming step
includes the step of attaching regions of body tissue on the wall
of the stomach.
109. The method according to claim 108 wherein the attaching step
is performed using sutures.
110. The method according to claim 108 wherein the attaching step
is performed using t-bars.
111. The method according to claim 108 wherein the attaching step
is performed using pledgets.
112. The method according to claim 108, wherein attaching step
causes sections of serosal tissue to be positioned in apposition,
and wherein the method further includes the step of causing the
opposed sections of serosal tissue to adhere to one another.
113. The method according to claim 112 wherein the causing step is
performed prior to the positioning step.
114. The method according to claim 107, wherein the positioning
step includes fastening the implant to the tissue ridge.
115. The method according to claim 107 wherein the forming step is
performed using endoscopic instruments passed through the esophagus
into the stomach.
116. The method according to claim 115 wherein the forming step
includes the steps of: extending a tissue-engaging device through
the esophagus into the stomach; engaging tissue with the
tissue-engaging device and drawing the engaged tissue in a proximal
direction to form a plication; and during the drawing step,
advancing a fastener through the plication.
117. The method according to claim 107 wherein the positioning step
includes the steps of: extending tissue-engaging members through
the esophagus into the stomach; engaging portions of the tissue
ridge with the elements and drawing the engaged portions in a
proximal direction; and during the engaging step, advancing the
implant against the tissue ridge.
118. The method according to claim 117 wherein the tissue-engaging
members including a plurality of elongate members having
tissue-engaging distal ends, and wherein the advancing step
includes slidably attaching the implant to the elongate members and
sliding the implant along the members in a distal direction.
119. The method according to claim 107 wherein the implant is an
obesity-controlling implant.
120. The method according to claim 107, further including the step
of attaching a restrictive component to the implant, the
restrictive component having an opening oriented such that food
ingested by the patient flows through the opening and into the
stomach, the opening proportioned such food flows through the
opening at a rate that is slower than the rate at which food would
flow into the stomach in the absence of the restrictive
component.
121. The method according claim 120, wherein the restrictive
component is a first restrictive component, and wherein the method
further included the step of removing the first restrictive
component and attaching a second restrictive component, the second
restrictive component having an opening proportioned such food
flows through the opening at a rate that is different than the rate
at which food would flow into the stomach through the opening of
the first restrictive component.
122. The method according to claim 107 wherein the implant is a
device for controlling gastro-intestinal reflux disease.
Description
[0001] This application claims the benefit of U.S. Provisional
Application No. 60/510,268, filed Oct. 10, 2003.
[0002] Inventors: Richard S. Stack, MD; Dan Balbierz; John
Lunsford; Kevin van Bladel; William S. Eubanks MD, William L.
Athas, Richard A. Glenn, Richard Kouri
FIELD OF THE INVENTION
[0003] The present invention relates generally to the field of
gastro-esophageal implant devices, and specifically to devices and
methods for retaining such implants within the gastro-esophageal
junction region or stomach of a patient.
BACK GROUND OF THE INVENTION
[0004] An anatomical view of a human stomach S and associated
features is shown in FIG. IA. The esophagus E delivers food from
the mouth to the proximal portion of the stomach S. The z-line or
gastro-esophageal junction Z is the irregularly-shaped border
between the thin tissue of the esophagus and the thicker tissue of
the stomach wall. The gastro-esophageal junction region G is the
region encompassing the distal portion of the esophagus E, the
z-line, and the proximal portion of the stomach S.
[0005] Stomach S includes a fundus F at its proximal end and an
antrum A at its distal end. Antrum A feeds into the pylorus P which
attaches to the duodenum D, the proximal region of the small
intestine. Within the pylorus P is a sphincter that prevents
backflow of food from the duodenum D into the stomach. The middle
region of the small intestine, positioned distally of the duodenum
D, is the jejunum J.
[0006] FIG. 1B illustrates the tissue layers forming the stomach
wall. The outermost layer is the serosal layer or "serosa" S and
the innermost layer, lining the stomach interior, is the mucosal
layer or "mucosa" MUC. The submucosa SM and the multi-layer
muscularis M lie between the mucosa and the serosa.
[0007] Various types of implants are positionable within the
esophagus or stomach. These include prosthetic valves implanted for
treatment of gastro-esophageal reflux disease. Another category of
stomach implants includes prosthetic implants for controlling
obesity. These include space-occupying devices such as inflatable
balloons tethered to the stomach interior. Other
obesity-controlling implants are shown and described in U.S.
application Ser. No. 09/940,110, filed Aug. 27, 2001 and U.S.
application Ser. No. 10/118,211006 filed Apr. 8, 2002, and U.S.
Provisional Application No. 60/379,306 filed May 10, 2002, U.S.
application Ser. Nos. 10/345,666 and 10/345,1104 filed Jan. 16,
2003. These applications are owned by the assignee of the present
application, and the disclosures of these applications are
incorporated herein by reference. Certain forms of these devices
involve positioning a restrictive device in the proximal stomach.
For example, a prosthetic pouch 2 of the type shown in FIG. 2A may
be positioned in the proximal stomach or at the gastro-esophageal
junction region as shown in FIG. 2B. The pouch may act as a
restrictor, limiting the amount of food intake by restricting
passage of food from the esophagus into the stomach.
[0008] This type of pouch 2 may include a proximal opening 4 and a
smaller distal opening 6 and forms a small reservoir that collects
masticated food from the esophagus--thereby limiting the amount of
food that can be consumed at one time. Because of its small volume
(which may be on the order of approximately 2 cc-300 cc in volume,
but is preferably in the range of 10-30 cc), the pouch functions to
limit the amount of food that can be consumed at one time. Over
time the food within this reservoir descends into the stomach
through the distal opening.
[0009] As the pouch fills with food, it may distend, imparting
pressure against the upper stomach and lower esophageal sphincter
causing the patient to experience sensations of fullness. Other
types of restrictive devices are disclosed in the above-identified
prior applications as well as in this application.
[0010] The pouch 2 or other restrictive implant may be formed of a
flexible material. Examples of such materials include, but are not
limited to polyesters (e.g. Dacron.RTM. polyester), ePTFE fabric
(e.g. GoreTex.RTM. fabric or others), a polyurethane such as
ChronoFlex.RTM. polyurethane, nylon fabrics, silicone, other
polymeric materials, and bio-absorbable materials (e.g. PLLA, PGA,
PCL, poly-amhydride etc). In the case of the pouch 2, it is optimal
but not mandatory that the material prevents passage of food
through the sides of the pouch. The material may be a composite of
compliant, semi-compliant and/or non-compliant materials that give
different regions of the pouch different degrees of compliance so
as to allow/limit expansion of the pouch in various locations. For
example, it may be desirable to provide a pouch with a fairly
elastic exit port to as to prevent occlusion in the event a large
piece of food is ingested and/or to control the exit pressure of
food from the pouch, whereas the proximal end of the pouch may be
stiffer to prevent bulging. Varying degrees of compliance may also
be built into the pouch by varying the cross-sectional thickness in
different regions of the pouch. The material may be coated with a
lubricious, bio-compatible, chemically inert material, such as
paraleyne, to reduce friction on the base material's surface which
will help prevent sticking and food build up on the device.
[0011] The restrictive implant may be reinforced with, constructed
of, or supported by supporting members, such as a soft mesh, a cage
structure, ribs, rings etc. The supporting members may be formed of
stainless steel, polymer, shape memory materials such as nitinol,
shape memory alloys, or shape memory polymers, or thickened regions
of material. The implant may be constructed so as to be
self-expanding, so that it will spring radially open into an
expanded condition upon ejection from a deployment device or
catheter.
[0012] The pouch 2 or other implant in the stomach/esophagus may be
fixed in place using sutures 8a, 8b or other means such as clips or
suitable adhesives at anchor points around the perimeter of the
proximal opening 4. The implant may include a reinforced section
such as rim section 9 on pouch 2 for receiving the sutures 8a, 8b
or other anchoring means. As illustrated in FIG. 2B, where
anchoring means such as clips or sutures are used, the anchoring
means may be passed completely through the wall of the stomach as
with suture 8a (called a "full thickness" suture or clip), or
partially through the wall of the stomach as with suture 8b (called
a "partial thickness" suture or clip). One suture attachment device
found useful for applying sutures between the pouch and tissue is
the "Sew-Right" suturing device available from LSI Solutions of
Victor, N.Y. Although the pouch may be secured to the esophageal
tissue, it is more preferable to apply sutures/clips below the
Z-line to allow for attachment to the thicker tissue of the stomach
wall.
[0013] Once secured within the stomach, the implant and associated
anchoring means are subjected to significant forces caused by
stomach motility and by forces imparted against the pouch by
ingested food. Such forces may be imparted against restrictive
devices such as pouch 2 as well as other forms of gastro-esophageal
implants, such as prosthetic valves implanted within the esophagus
for treatment of gastro-esophageal reflux disease or
space-occupying implants for hunger control. Over time, such forces
could cause the implant to become detached from the wall of the
stomach or esophagus due to erosion of the stomach/esophageal
tissue at the anchoring points. It is thus desirable to provide an
anchoring mechanism that will retain an implant within the stomach
and/or esophagus over an extended period of time.
SUMMARY
[0014] Various methods and devices are described for retaining a
medical implant within a body cavity. According to one aspect, at
least a portion of a medical implant is positioned within a body
cavity, and a wall of the body cavity is re-shaped such that the
re-shaped wall prevents migration of the medical implant out of the
body cavity.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] FIG. 1A is a schematic illustration of a human stomach and a
portion of the small intestine.
[0016] FIG. 1B is a cross-sectional perspective view of a portion
of a stomach wall, illustrating the layers of tissue forming the
wall.
[0017] FIG. 2A is a perspective view of a restrictive device of a
type that may be used to promote weight loss.
[0018] FIG. 2B is a cross-sectional elevation view of an esophagus
and proximal stomach, showing the restrictive device of FIG. 2A
implanted in the gastro-esophageal junction region.
[0019] FIG. 3 is a perspective view illustrating a restrictive
device retained by tissue structures in the proximal portion of a
human stomach.
[0020] FIGS. 4A and 4B are perspective views of alternate
embodiments of restrictive implant utilizing a ring as a
restrictive element.
[0021] FIG. 4C is a perspective view illustrating an alternate
embodiment of a restrictive implant utilizing a notched disk as a
restrictive element. The implant is shown positioned at the
gastro-esophageal junction region. FIG. 4D is a cross-sectional
front view showing the implant positioned within the
gastro-esophageal junction region.
[0022] FIG. 4E is a perspective view similar to FIG. 3 showing an
inflatable restrictive implant retained within the
gastro-esophageal junction region. Also shown are an inflation tube
and an endoscope. FIG. 4F is similar to FIG. 4E but shows the
implant following inflation, with the inflation tube still attached
to the restrictive implant.
[0023] FIG. 5A is a front perspective view of a stomach wall
illustrating formation of a vertical tissue pocket formed using
plications in the wall.
[0024] FIG. 5B is a perspective view looking downwardly into the
interior of a stomach, illustrating placement of the implant of
FIG. 4A into pockets formed by plications of the type shown in FIG.
5A.
[0025] FIG. 6A is a front schematic illustration of an esophagus
and stomach, illustrating formation of tissue pockets using a
surgical stapler.
[0026] FIG. 6B is a cross-section view of a tissue pocket, taken
along the plane designated 6B-6B in FIG. 6A.
[0027] FIG. 6C is a cross-sectional side view of a proximal
stomach.
[0028] FIG. 6D is cross-section view taken along the plane
designated 6D-6D in FIG. 6C, illustrating one form of plication
formed in the stomach wall to create tissue pockets.
[0029] FIG. 7 is a cross-section view of a portion of a stomach
wall, showing a modification to the FIG. 6A-6B arrangement in which
the tissue pocket is formed from within the stomach.
[0030] FIGS. 8A and 8B are a cross-sectional side view of a stomach
wall illustrating methods for drawing tissue together to form
plications in the stomach wall.
[0031] FIGS. 8C and 8D are similar to FIGS. 8A and 8B further
illustrate methods of attaching the folds of tissue that have been
drawn together to form a tissue pocket.
[0032] FIGS. 8E through 8G are cross-sectional top views of a
portion of a stomach wall, illustrating various configurations of
plications that may be formed to create tissue pockets.
[0033] FIG. 9B is a cross-section view of a stomach similar to FIG.
6D, illustrating an alternate form of plication used to create
tissue pockets. A more detailed view of one of the pockets of FIG.
9B is shown in FIG. 9A. FIG. 9C is a cross-sectional top view of a
portion of a stomach wall showing yet another plication arrangement
for forming a tissue pocket.
[0034] FIG. 10A is a cross-sectional perspective view of a portion
of stomach wall, showing yet another type of plication that may be
used. FIG. 10B is a cross-sectional top view of a stomach, similar
to FIG. 6D, showing three such plications in the wall of a
stomach.
[0035] FIGS. 11A through 11D are a sequence of cross-sectional
perspective views of a portion of stomach wall, showing yet another
plication method for forming tissue pockets.
[0036] FIGS. 12A through G are a sequence of cross-sectional
perspective views of a proximal portion of a stomach, illustrating
another method for forming plications to create tissue pockets.
[0037] FIG. 13A is a side elevation view of suturing device for
modifying a tissue surface and for forming a plication in tissue.
FIG. 13B is a cross-section view of the distal portion of the
device of FIG. 13A. FIGS. 13C-13G illustrate use of the device of
FIGS. 13A-13B to form tissue pockets, and FIG. 13H illustrates
positioning portions of a restrictive implant within the tissue
pockets.
[0038] FIG. 14A is a cross-sectional side view of a distal portion
of an alternative embodiment of a tissue modification device which
uses an ablative wire loop. FIG. 14B is a cross-sectional side view
of a distal portion of yet another alternative embodiment of a
tissue modification device which uses an ablative contact
plate.
[0039] FIGS. 15A and 15B schematically illustrate implantation of a
restrictive device of the type shown in FIG. 3.
[0040] FIGS. 16A and 16B schematically illustrate an endoscopic
method for threading portions of a restrictive device into tissue
pockets within the stomach.
[0041] FIGS. 17-19 are cross-sectional plan views of a portion of a
stomach and esophagus, showing restrictive devices and arrangements
of components for retaining the restrictive devices in
position.
[0042] FIG. 20A is a top perspective view looking down into a
stomach and illustrating the use of plications for retaining a ring
within the stomach.
[0043] FIG. 20B is a cross-section view of a plication and ring
taken along the plane designated 20B-20B in FIG. 20A.
[0044] FIG. 20C is a top perspective view similar to FIG. 20A
illustrating the use of plications for retaining an alternative
ring within the stomach.
[0045] FIG. 20D is a top perspective view looking down into a
stomach and illustrating the use of plications for retaining
multiple members within the stomach.
[0046] FIG. 21 A is a cross-sectional top view of a stomach,
illustrating plications formed in the stomach.
[0047] FIG. 21B is a cross-sectional elevation view of a plication
illustrating use of the plications to support a liner within the
stomach.
[0048] FIGS. 22A-24 are cross-sectional front views of an esophagus
and stomach illustrating the use of rings to shape the stomach wall
for retaining an implant.
[0049] FIG. 25 is a cross-sectional front view of a proximal
stomach illustrating a method of forming an anchoring structure
within the stomach.
[0050] FIG. 26A is a schematic illustration of a portion of an
exterior stomach wall, showing a pledget anchored to the wall as an
external reinforcement to an internally positioned restrictive
device.
[0051] FIG. 26B is a schematic illustration similar to FIG. 26A,
showing a T-bar anchored to the wall as an external reinforcement
to an internally positioned restrictive device.
[0052] FIG. 27A is a schematic illustration of the exterior of a
lower esophagus and proximal stomach, showing "moly bolt" type
external reinforcements used to facilitate anchoring of an
internally positioned restrictive device. FIGS. 27B and 27C are
cross-sectional side views showing introduction of the external
reinforcement device through the stomach wall and its subsequent
expansion to anchor a restrictive device in place
[0053] FIGS. 28A through 28C are schematic illustrations of the
exteriors of a lower esophagus and proximal stomach, each showing
four additional embodiments of external reinforcements used to
facilitate anchoring of an internally positioned restrictive
device.
[0054] FIG. 29A is a perspective view of a stud-type fastener which
may be used to connect an internally positioned restrictive device
to an external reinforcement device. FIGS. 29B through 29F are side
elevation views showing examples of means for connecting the device
of FIG. 29A through stomach tissue to the externally positioned
external reinforcement device. The stomach tissue is shown in
cross-section.
[0055] FIGS. 30A and 30B are cross-sectional side elevation views
showing self-balancing external reinforcements connected to stomach
tissue. FIG. 30A shows the reinforcements in an equilibrium state,
whereas FIG. 30B shows the alteration of the reinforcements in
response to a force.
[0056] FIGS. 31A through 31I are schematic illustrations of a lower
esophagus and proximal stomach, each showing a different embodiment
of an external collar.
[0057] FIG. 32A is a cross-sectional side elevation view of a
distal esophagus, proximal stomach, and external collar.
[0058] FIG. 32B is a perspective view of the collar shown in FIG.
32A in a straightened configuration.
[0059] FIG. 32C is a perspective view of a collar of the type shown
in FIG. 32B, but having an alternative locking mechanism. FIG. 33A
is a perspective view of an example of an alternative restrictive
device, in which the restrictive device takes the form of a rigid
ring.
[0060] FIG. 33B is a perspective view of another example of an
alternative restrictive device, which has a tapered geometry.
[0061] FIG. 33C is a perspective view of still another example of
an alternative restrictive device, which has a bellows
configuration.
[0062] FIG. 33D is a perspective view of another example of an
alternative restrictive device, which includes a collection of
separate segments that collectively form a restriction in the
stomach.
[0063] FIG. 34A is a side elevation view of a stomach which has
been re-shaped to include a tunnel. FIG. 34B is a cross-section
view of the stomach showing a restrictive device anchored in the
tunnel.
[0064] FIG. 35A is a cross-section view of a stomach which has been
re-shaped for retention of an implant. FIGS. 35B and 35C illustrate
implants retained by the re-shaped wall of the stomach.
[0065] FIGS. 36A through 36F are a sequence of cross-section views
of a stomach illustrating a method of re-shaping tissue to form a
circumferential plication, and using the circumferential plication
to retain an implant.
[0066] FIGS. 37A through 37D are a sequence of cross-section views
illustrating a modification to the method shown in FIGS. 36A
through 36F. FIG. 37E illustrates insertion of a restrictive insert
into the support ring. FIGS. 37F and 37G show the support ring
before and after insertion of the orifice, respectively.
DETAILED DESCRIPTION OF THE DRAWINGS
[0067] The drawings show a number of methods and components that
may be used individually or in combination with one another to
facilitate retention of an implant in the stomach or esophagus,
including in the gastro-esophageal junction region. These methods
and components may facilitate retention by (1) re-shaping tissue or
otherwise modifying the structure of the tissue at the implant
location in a manner which allows a tissue structure to aid in
retaining the implant either with or without a physical connection
between the tissue and the implant; (2) anchoring the devices in
place; and/or (3) facilitating even distribution of forces (e.g.
forces resulting from food pressure or stomach motility) around the
implant to minimize the chance of tissue erosion at points where
the implant contacts or is anchored to tissue. This application
also describes alternative embodiments to the restrictive device 2
of FIG. 2A.
[0068] For the purposes of this application, the terms "restrictive
devices", "satiation devices," "obstructive devices" or "satiation
pouches" will be used to mean devices or pouches intended to induce
weight loss in one or more of a variety of ways. These include, but
are not limited to, slowing the rate at which food passes from the
esophagus into the stomach, physically restricting the amount of
food that can be consumed, and/or imparting pressure against
portions of the body (e.g. stomach, esophagus, esophageal
sphincter, etc) causing the patient to experience sensations of
fullness, and/or affecting levels of hormones or other substances
in the body that control or affect feelings of hunger, and/or
affecting the amount of ingested food absorbed by the body. The
anchoring devices and methods described herein are useful for
various types of satiation implants, including those not
specifically described herein and including those positionable in
the esophagus, the gastro-esophageal junction region and other
portions of the stomach including the proximal stomach, fundus,
antrum, etc.
[0069] It should be noted that although the embodiments are
described in the context of satiation devices, the components and
methods described for facilitating retention and/or promoting even
distribution of forces may be equally suitable with other types of
implants. These implants include, but are not limited to prosthetic
valves for the treatment of gastro-esophageal reflux disease,
gastric stimulators, pH monitors and drug eluting devices that
release drugs, biologics or cells into the stomach or elsewhere in
the GI tract. Such drug eluting devices might include those which
release leptin (a hormone which creates feelings of satiety),
Ghrelin (a hormone which creates feelings of hunger), octreotide
(which reduces Ghrelin levels and thus reduces hunger), Insulin,
chemotherapeutic agents, natural biologics (e.g. growth factor,
cytokines) which aid in post surgery trauma, ulcers, lacerations
etc. As yet another example, the implant may provide a platform to
which specific cell types can adhere, grow and provide
biologically-active gene products to the GI tract. As other
alternatives, an implant may provide a platform for radiation
sources that can provide a local source of radiation for
therapeutic purposes, or provide a platform whereby diagnostic
ligands are immobilized and used to sample the GI tract for
evidence of specific normal or pathological conditions, or provide
an anchor point for imaging the GI tract via cameras and other
image collecting devices.
[0070] It should also be noted that the embodiments described
herein have broad applicability for retaining implants in parts of
the body outside the GI system. The term "implant" will thus be
used to refer to satiation devices as well as other types of
medical devices that may be implanted in the esophagus,
gastro-esophageal junction, stomach, elsewhere within the GI tract,
or in other hollow organs, vessels, and cavities of the body.
[0071] Retention Methods Utilizing Re-Shaping Techniques
[0072] FIGS. 3-24 illustrate implants and implantation techniques
which minimize or largely avoid connecting the implant and body
tissue using connectors (i.e. sutures, staples, clips etc.) that
both penetrate the surface of the body tissue and physically
connect to the implant. In these embodiments, a portion of the
implant is captured by a tissue structure formed within the body by
re-shaping body tissue. As will be appreciated from the description
that follows, such tissue structures may be strictures created in
the stomach to retain the device, or they may be pockets, tunnels,
ledges or other barriers against implant migration formed by
attaching regions of tissue and/or creating plications in the
stomach tissue. The tissue structures may be formed using
endoscopic procedures passed through the esophagus into the
stomach, and/or using laparoscopic or surgical procedures..
[0073] FIG. 3 shows a restrictive implant 10 being retained by
plications 12 formed in stomach tissue. The plications may be
formed by grasping sections of tissue and suturing the tissue
together to form pocket-like tissue structures 14. Such structures
are pocket-like in the sense that they have an interior space
bounded by tissue, and at least one opening extending into the
interior space. The interior walls of the pocket may lie in contact
with one another, collapsing the interior space in the same way the
space within a shirt pocket is collapsed. The pockets may also be
tunnel-like in the sense that there may be openings on opposite
sides of the interior space so that an instrument or portion of a
medical device may be passed through the pocket. If necessary, more
than two such openings may be provided in the pocket. In other
embodiments, the pockets may be more tubular or tunnel-like.
[0074] The implant 10 includes leg members 16 that are retained
within the pockets 14 of the plications 12. During implantation,
the leg members may be inserted into the pockets 14, or the implant
may be positioned before the plications are formed, in which case
the plications 12 may be formed around the leg members 16.
[0075] Restrictive implant 10 includes a restrictive component 18
which may be any configuration that slows the passage of food into
the stomach, such as by reducing the effective cross-sectional area
of the flow path between the esophagus and stomach or between one
region of the stomach and another region of the stomach. For
example, the restrictive component may be a pouch similar to see
pouch 2 of FIG. 2A, or a restrictive ring 18a (see FIGS. 3, 4A, 4B)
or a notched disk 18b (FIGS. 4C and 4D), or a mesh screen. The
restrictive component might also be a partially obstructive balloon
18b that may be implanted in a deflated condition under
visualization using an endoscope 19 (FIG. 4E and 4F), and then
inflated using an inflation tube 21 coupled to a source of
inflation medium such as air or gas. The balloon 18b may be
torroidal etc so as to include an opening for passage of food, or
it may be shaped to permit flow of food around its exterior. As yet
another alternative, a ring such as ring 18a FIGS. 4A and 4B may be
provided, and an additional restrictive component (e.g. an
obstructive member such as a pouch, disk, balloon, etc.) may be
separately attachable to the ring before or after implantation. An
examples of this type of configuration is shown in FIG. 37E. This
allows the physician to select and alter the amount of restriction
needed for a particular patient.
[0076] The leg members 16 may be long enough to be retained in
tissue pockets formed well into the stomach, such as in the antrum,
the fundus or other regions of the stomach while still positioning
the restrictive orifice of the device in the proximal stomach.
Alternatively, the leg members 16 may be shorter for retention by
plications in the gastro-esophageal junction region or other
proximal portions of the stomach. This concept of retaining the
implant using tissue plications may be applied to implants
positionable in other regions of the stomach (and throughout the
body) as well, and is not limited to use with implants that provide
restriction in the proximal stomach.
[0077] Implant 10a of FIG. 4A includes retention elements such as
soft stops 24 at the ends of members 16a. These elements deform for
passage into a pocket and expand upon exiting the pocket.
Inflatable retention elements may likewise be used. As another
alternative shown in FIG. 4B, the soft stops may be replaced with
barbs or hooks 24a that are deployed through the pockets 14 in a
straight orientation and that are deformable or adjustable to a
curved orientation following deployment to facilitate
retention.
[0078] Formation of Pockets
[0079] The orientation of the pockets may be selected depending on
the purpose to be achieved by the plications and/or the orientation
of the implant to be retained. Referring again to FIG. 3, pockets
14 may be formed to have a more vertical orientation (i.e. more or
less radiating away from the gastro-esophageal junction) as opposed
to the more horizontal pockets shown in later drawings which may
line up somewhat circumferentially around a portion of the stomach.
Referring to FIG. 5A, the pockets 14 may comprise plications 12
created by drawing folds 20 of tissue around a mandrel 22 within
the stomach, and then attaching the folds together using sutures
24. The mandrel may then be removed, leaving a pocket 14 in its
place. Afterwards, legs 16 of the implant 10 are inserted into the
pocket 14 as shown in FIG. 5B. Over time, the regions of tissue
held in apposition will adhere together due to the body's
physiological or biological response, such as formation of fibrous
tissue or scar tissue, growth of new tissue, or a growing, healing,
or knitting together of the opposed tissue layers. The term
"adhesion" will be used in this application to refer to the
adhering of opposed tissue layers as a result of any physiological
or biological response, including but not limited to those listed
above.
[0080] FIG. 6A illustrates formation of plications 12 using a
surgical stapler 28 approaching the exterior surface of the stomach
in a laparoscopic or open surgical procedure. As shown, the stapler
28 is provided with staples 30 in the distal most portion of its
jaws, but there are no staples in the more proximal portion 32 of
the jaws. To form a plication, the jaws are clamped onto a section
of stomach tissue and staples 30 are passed through the tissue. As
shown in FIG. 9B, the section of tissue 34 that was within proximal
portion 32 (FIG. 6A) of the jaws is not stapled, and thus forms a
tissue pocket 14. Referring to the top cross-section view of FIG.
6D, several such tissue pockets 14 may be formed around the stomach
so that portions of a restrictive device (such as leg members 16)
may be positioned within the pockets 14 as shown in FIG. 3. As will
be discussed in greater detail below, the manner of joining the
tissue to form the tissue plications should be chosen to allow the
plications to withstand the expansion forces F (FIG. 6D) that occur
along the stomach walls.
[0081] FIG. 7 is a top cross-section view of a portion of a stomach
wall, illustrating that the vertical plications 12 may be formed
from within the stomach (e.g. endoscopically using access through
the esophagus) to create tissue pocket 14. This may be performed
using an endoscopic staple, suturing device, or clip applier
introduced transorally into the stomach.
[0082] FIGS. 8A and 8B illustrate methods of forming a tissue
pocket such as that shown in FIG. 7 using endoscopic devices passed
into the stomach via the esophagus. These methods may also be
performed using a surgical or laparoscopic approach through the
stomach wall.
[0083] According to these methods, an endoscopic grasper 36 (FIG.
8A), corkscrew mechanism 38 (FIG. 8B), vacuum device 40 (FIG. 8B)
or alternative device is passed through the stomach via the
esophagus and used to pinch folds 42 of tissue, on the interior
stomach wall. Sutures (or clips, staples etc.) are passed through
the folds 42 to draw the folds into contact with one another into
the configuration shown in FIG. 7. It may be desirable to add rows
46 of sutures or staples through each fold 42 before the folds are
joined together, as shown in FIG. 8C The sutures/staples etc. may
optionally be passed through patches or strips 44 (FIG. 7) of
buttressing material such as bovine pericardium strips, Teflon
strips or polycarbonate strips so as to facilitate retention of the
staples/suture within the body tissue until such time as the
contacting tissue layers adhere together. Alternatively, pledgets,
t-bars, etc. of the type described in connection with FIGS. 26A-30B
may be used to buttress the sutures/staples until such time as
tissue adhesion occurs.
[0084] Over time, adhesions form between the tissue surfaces held
in contact by the sutures, thereby creating a much stronger bond
between the tissue surfaces than would be achieved using sutures
alone. If desired, dissolvable or bioabsorbable sutures may be used
to create the plications.
[0085] The procedure illustrated in FIGS. 8A through 8C is
particularly advantageous in that it relies in part on adhesion of
the serosal tissue lining the outer surface of the stomach. It has
been found that serosal tissue layers can adhere to form relatively
strong bonds when held in apposition to one another. Because the
procedure of FIGS. 8A-8C also strives for adhesion of some interior
stomach tissue after tissue folds or tabs 20 are attached together,
modification of the interior tissue surface may further be needed
in order to optimize adhesion of opposed regions of internal
stomach tissue. In particular, it is believed that better adhesion
of the interior wall surfaces may be achieved when a portion of the
mucosal layer of tissue lining the stomach interior is removed,
such that the tissue surfaces sutured in apposition to one another
are serosal, sub-mucosal or muscularis layers. It is believed that
opposed layers of mucosal tissue do not adhere together as well as
opposed layers of serosal, sub-mucosal, or muscularis tissue.
[0086] Referring to FIG. 8C, one surface modification method for
promoting tissue adhesion includes cutting, ablating (using RF,
laser, or chemical ablation) or abrading the mucosal surface of
each tissue fold 20 within the stomach as indicated by dashed
lines. This modification is ideally performed before the folds are
placed in apposition and sutured together. Depending on the depth
to which cutting, ablation or abrasion is performed, the
sub-mucosal, musclaris, or serosal layer beneath the mucosal layer
is exposed, and the corresponding abraded/cut sections of each fold
are placed in apposition and sutured/stapled together as indicated
in FIG. 8D. This allows the exposed regions of tissue to be sutured
together and causes the opposed surfaces to tightly adhere over
time. During the procedure, it may be helpful for the physician to
mark the exposed tissue regions using dyes or other markers to
allow the tissue to be easily identified when it is time to
position the exposed regions in apposition to one another.
[0087] FIG. 8E is a perspective view of a plication 12a and tissue
pocket 14a formed using the method described in connection with
FIGS. 8A through 8D. As can be seen, the plication includes long
serosal contact lines 220. The mucosal or submucosal contact line
222 (assuming tissue modification as shown in FIG. 8D) is
relatively small. Because an adhesion which forms along the serosal
contact line 220 is believed to be stronger than adhesions which
form along the mucosal or submucosal contact line 222, it is
desirable to proportion the plication such that the dimension
identified by arrow "X" is greater than the dimension identified by
arrow "Y". This configuration allows the greatest of the forces
imparted against the stomach (see forces F of FIG. 6D) to be borne
by the serosal adhesion. As illustrated in FIG. 8F, an elongated
versions of the plications of FIG. 8E may be formed to further
extend the length of the contacting regions so as to optimize the
strength of the adhered tissue. Another configuration resulting
from even longer adhesions is illustrated in FIG. 8G.
[0088] FIG. 9A illustrates another configuration of a tissue pocket
14b which relies in large part on regions of serosal contact 220
and relatively smaller regions of mucosal or submucosal contact
222. In addition, as illustrated in FIG. 9B, the contact lines
which result in adhesions are oriented "in shear" relative to the
primary forces F experienced by the stomach, and thus may be less
likely to pull apart in response to such forces. This is in
contrast to the pockets 14 FIG. 6D in which the contact lines are
oriented "in peel" relative to the forces F.
[0089] FIG. 9C illustrates another configuration of tissue pocket
14c in which the contact lines forming plications 12c are oriented
in shear. This configuration utilizes three plication folds and
forms a very long region of serosal contact 220.
[0090] FIGS. 10A, 11D, and 36A illustrate alternative forms of
tissue structures that may be formed, in which the serosal contact
lines form an adhesion that is in peel, but that differ from the
FIG. 6D plications in that they utilizes a serosal adhesion line
rather than a mucosal adhesion line.
[0091] Referring to FIG. 10A, to form plication 12d, tissue within
the stomach interior is pinched together to draw serosal layers on
the stomach exterior into contact with one another, thereby forming
folded tissue tab 20d. A hole 15 is formed in the tab 20d, and
staples 17 or sutures, etc., are placed around the hole 15 to keep
the tissue pinched together until a serosal adhesion forms.
Multiple tabs 20d may be formed as shown in FIG. 10B, and a portion
of the restrictive device (such legs 16 shown in FIG. 3) may be
passed into the holes 15 in the tabs to secure the implant within
the stomach. Alternatively, an implant may be hung from the tabs
20d using sutures or clips.
[0092] As yet another alternative, the FIG. 10A plications may be
used without tissue pockets by eliminating the holes 20d and by
using sutures or clips to penetrate the tissue and to connect the
tissue to the implant. A variation of this alternative is described
in connection with FIGS. 3A-36F described below.
[0093] To form a structure of the type shown in FIG. 11D, tissue
within the stomach interior again is pinched to draw the serosal
layers into contact as shown in FIG. 11A, thereby forming a folded
tab 20e. Next, staples 17 or sutures etc. are used to define a
C-shaped (or similarly shaped) line through the tab 20e. Cuts 21
are formed through the full thickness of the stomach tissue as
shown in FIG. 11B. It should be noted that because the cuts 21 are
full thickness cuts, the staples 17 are used to seal the stomach
interior from the stomach exterior.
[0094] After the cuts 21 are formed, the areas of tissue
surrounding the cuts 21 are folded downwardly as indicated by
arrows in FIG. 11B. The remainder of the tab 20e is opened as shown
in FIG. 11D to create a serosal pocket 14e which is accessible from
the mucosal (interior) side of the stomach. The serosal tissue
forming the interior of the pocket may be lined with a small
stent-like device or another liner to protect it from stomach
acids. Over time, a mucosal tissue layer may grow over this serosal
interior of the pocket (and/or over the stent or liner) and thereby
further protecting it from the acidic stomach environment.
[0095] FIGS. 12A through 12G illustrate another method of forming
tissue pockets that take advantage of the strong adhesions formed
when serosal tissue surfaces are held in apposition. Referring to
FIG. 12A, a rod 226 is positioned on the exterior surface of the
stomach, and sutures 228 are attached to the rod 226 and passed
through the stomach walls. The sutures 228 are drawn inwardly using
an endoscopic grasper (not shown) to "tent" a section 230 of tissue
of the type shown in FIG. 12C. If desired, the rod 226 may be
eliminated, in which case a pair of sutures 228a may be passed from
the stomach interior, through the stomach wall, and then back into
the stomach interior, and then drawn inwardly using an endoscopic
grasper 232 to tent the tissue as shown in dashed lines.
[0096] Next, a line 234 of staples or sutures are applied across
the tented tissue from the mucosal side of the stomach--thereby
forming an enclosed pocket 236 on the exterior surface of the
stomach as shown in FIG. 12D. The rod 226 (if used) is enclosed
within the pocket 236. Stapling/suturing may be performed using an
endoscopic stapler 238a passed through the esophagus into the
stomach, or using a laparoscopic stapler 238b introduced into the
stomach through a surgical gastronomy site--both of which are shown
in FIG. 12C. The stapler/suture device preferably has
characteristics that will form a suture/staple line 234 that is
sufficiently patent to seal the serosal tissue together to prevent
stomach leakage prior to complete serosal adhesion, but that
ensures good blood flow so as to promote healing of the stapled
tissue. For example, a conventional stapler modified to have a
staple cartridge in which alternate staples have been removed may
achieve this purpose.
[0097] A collar 220 may be placed around the tented tissue 230 as
shown in FIG. 12C prior to suturing/stapling so as to apply tension
to the wall tissue to facilitate suturing or stapling.
[0098] The suture line 234 holds the serosal layers of tissue
together as shown in FIG. 12E, thereby holding the pocket 236
together. The ends 242 of the pocket are cut, turning the pocket
216 into a tissue pocket 244 having ends that open into the stomach
interior. The rod 226, if used, is removed from the pocket 244. As
with the other embodiments, the tissue preferably heals together to
form an adhesion that maintains the pocket.
[0099] Because the tissue pocket 244 is formed of serosal tissue,
it may be desirable to line the pocket 244 with a stent-like device
246 or another liner to both reinforce the pocket and protect the
serosal surface from the acidic stomach environment.
[0100] As with the other embodiments, the procedure continues with
formation of as many pockets as are needed to retain the desired
implant in the stomach. Then, implants (or portions of implants)
are fed into the pockets for retention within the stomach. As one
example, legs 16 of a device such as device 10 (FIG. 3) may be
extended through the pockets. Alternatively, other forms of
implants (e.g. capsules containing diagnostic or therapeutic agents
or devices, c-bars 248 of FIG. 12G to which implants or space
occupying devices may be attached) may be positioned within the
pockets 244. A drug-eluting capsule or similar implant may be
proportioned to fit in its entirety within the pocket form using
this or other methods. The openings in the pocket may be closed
following insertion of the capsule such that drugs eluted by the
capsule pass through the walls of the pocket and into the
stomach.
[0101] As a third alternative, a member may be positioned in a
pocket and tethered to a gastric balloon or other space-occupying
device used in for inducing weight loss, or to another type of
medical device such as a therapeutic or diagnostic device.
[0102] Tissue Surface Modification
[0103] As discussed in connection with FIGS. 8C and 8D, when
interior stomach surfaces are to be placed in apposition so as to
induce adhesion, it may be advantageous to modify the tissue
surface so that submucosal, serosal, or muscularis tissue (rather
than mucosal tissue) is used to form the adhesion. FIGS. 13A
through 14B illustrate various methods for altering the interior
stomach surface for this purpose.
[0104] As one example, a single device may be used to modify
regions of surface tissue and to join modified tissue surfaces.
FIGS. 13A and 13B, illustrate a cutting and suturing device 48 that
may be used for slicing a layer of tissue from the interior of the
stomach and passing a suture through a portion of the remaining
tissue. In particular, the device can modify neighboring surface
regions of tissue, and then drawing the modified surface regions
into contact with one another to promote adhesion and to form a
tissue pocket.
[0105] Referring to FIG. 13A, device 48 includes an elongate shaft
50 extending from a handle 52. Means is provided in the handle 52
for articulating the shaft 50 in one or more planes using methods
known to those skilled in the art.
[0106] Referring to FIG. 13B, a recess 54 is formed in the distal
end of the device 48. A suture lumen 56, a needle lumen 58, and a
cutting blade lumen 60 extend through the shaft 50 and separately
open into the recess. The device may optionally be provided with a
vacuum source (not shown) that allows a vacuum to be applied to
draw tissue into the recess 54. For this purpose, a fourth lumen
having a plurality of inlets exposed to the interior of the recess
may be provided and be connectable to a vacuum source.
[0107] A suture 62 is disposed within the suture lumen 56. The
suture 62 has a suture catch 64 on its distal end, positioned
adjacent to the opening of the lumen 56 into the recess 54. A
suture needle 66 is slidable within the needle lumen 58. The needle
lumen 58 and suture lumen 56 are oriented such that during
operation needle 66 may be extended from the needle lumen 58,
through tissue disposed within the recess and into engagement with
the suture catch 64. As will be described in further detail below,
subsequent retraction of the suture needle 66 carries the suture
catch 64 and the end of suture 62 through the tissue and into
needle lumen 58.
[0108] A cutting blade 68 is slidable within the cutting blade
lumen 60 to shave a layer from tissue disposed within the recess
54. The handle 52 (FIG. 13A) includes actuators (not shown) for
extending and retracting both the cutting blade 68 and the needle
66.
[0109] Use of the device 48 will next be described with reference
to FIGS. 13C through 13H.
[0110] First, the device 48 is introduced into the stomach under
endoscopic visualization. The device 48 is placed into contact with
the target stomach tissue, and tissue is drawn into the recess 54.
This may be accomplished by pressing the recess 54 against the
tissue surface, or by activating a vacuum source configured to draw
tissue into the recess 54. As discussed previously and as indicated
in FIG. 13C, the tissue is comprised of several tissue layers: the
mucosa MUC which lines the stomach interior, the submucosa SM
beneath the mucosa MUC, the muscularis M, and the serosa S which
lines the stomach exterior. The dimensions of the recess 54 and the
position of the blade 68 are chosen such that tissue will be drawn
into recess 54 by an amount that will appropriately align the
tissue layer(s) to be removed with the blade 68. In preferred
examples, the mucosa MUC will be removed to expose the submucosa SM
or both the mucosa and submucosa SM will be removed to expose the
muscularis M. For purposes of illustration, removal of the mucosa
MUC will be described in connection with FIGS. 13C through 13F.
[0111] Once tissue has been drawn into recess 54, the cutting blade
68 is advanced (FIG. 13D) into the recess 54 to shave off the
mucosa MUC, thereby leaving an exposed region E1 of submucosa (FIG.
13E). A source of RF energy (not shown) may be electrically
connected to the cutting blade 68 to coagulate tissue during or
after resection, so as to reduce bleeding and promote tissue
healing. If ablation energy is used, a grounding electrode is
positioned in contact with the patient during use of the
device.
[0112] Next (or simultaneously with advancement of the cutting
blade 68), the suture needle 66 is driven through the tissue,
engages with the suture catch 64 (FIG. 13D), and carries the catch
64 and the suture end back through the tissue into the device 48.
The tissue is released from the recess 54, and the suture end is
retrieved from the proximal end of the device, leaving a loop of
suture in tissue as shown.
[0113] Next, the process is repeated at an adjacent location
(preferably using the same unit of device 48 but alternatively
using a second unit), thus creating a second exposed patch E2 of
submucosa and placing a second suture 70 through the tissue as
shown in FIG. 13F. The exposed patches E1 and E2 of submucosal
tissue are brought into contact with. one another, such as by
pulling the sutures 62, 70, thereby forming tissue pocket 72 (FIG.
13G). The sutures are anchored together to retain contact between
the exposed patches. Eventually, the exposed submucosa (or
muscularis) surfaces adhere together, forming a strong tissue
adhesion that retains the tissue pocket within the stomach. As
shown in FIG. 13G, both the interior of the stomach and the
interior of the pocket 72 remain lined with healthy mucosa MUC.
[0114] Referring to FIG. 13H, the leg members 16 of the implant 10
are secured within the tissue pocket 72. This may be done at a
later date so as to allow tissue adhesion to occur before the
tissue is subjected to loading by the implant. The tissue pockets
72 may be marked using dyes or other markers to allow them to be
easily identified when it is time to secure the implant 10.
[0115] Depending on the length of the leg members 16, only one or
two such pockets 72 may be needed for retaining a leg member 16, or
each leg member may be retained by an elongate array of pockets 72
as shown.
[0116] Other techniques may also be used for modifying the tissue
surface to achieve optimal tissue adhesion between opposed tissue
surfaces. Referring to FIG. 14A, the cutting blade 68 of the FIG.
13B embodiment may be replaced with an RF loop snare 74. During
use, the loop snare 74 is oriented such that tissue passes into the
loop when tissue is drawn into the recess 54. Once tissue is within
the recess, the snare (which is energized with RF energy) in
retracted in a proximal direction to shave off the target tissue
layer.
[0117] In another alternative shown in FIG. 14B, the cutting blade
is replaced by an RF electrode plate 76 disposed within the recess.
Tissue drawn into the recess 54 is thus drawn into contact with the
plate 76 and is ablated.
[0118] Positioning Implants within Tissue Pockets
[0119] FIGS. 15A and 15B illustrate one method for securing implant
10 using pockets of the type formed with device 48. Referring to
FIG. 15A, a hollow guide sheath 78 is passed into the patient's
esophagus via the mouth. Implant 10 is passed in a streamlined
position through the guide sheath and into the stomach using a
plurality of mandrels 80 individually attached to each of the legs
16 and to the implant body 18, if necessary. The mandrels 80 are
preferably steerable to allow for manipulation of the legs to the
desired positions within the stomach. After the implant 10 enters
the stomach, it is allowed or caused to open to its expanded
position. An endoscope 82 is passed through the guide sheath 78 and
into the stomach.
[0120] Laparoscopic incisions are next formed into the abdominal
cavity, a trocar 84 is positioned in the incision, and the
abdominal cavity is insufflated using procedures well known to
those of skill in the art. Suture device 48 (or another type of
device such as a laparoscopic stapler or clip applier) is passed
through the trocar 84 and used under endoscopic visualization to
plicate tissue pockets around the device leg members 16. The
laparoscopic procedure is repeated for each of the leg members 16.
Naturally, an open surgical procedure may be carried out in place
of the laparoscopic procedure. In a less invasive procedure, the
suture device 48 may be introduced through the esophagus into the
stomach rather than through surgical or laparoscopic incisions.
[0121] As discussed previously, it may be desirable to form the
tissue pockets 72 before introducing the implant. The pre-formed
tissue pockets 72 may be plicated as described in connection with
FIGS. 13D through 13G or using alternative methods.
[0122] One method of delivering the legs 16 into the tissue pockets
72 is shown in FIGS. 16A and 16B. In preparation for introducing
implant 10, the distal ends of a plurality of guidewires 86 are
passed down the esophagus into the stomach. The number of
guidewires is selected to match the number of legs 16 on the
implant 10.
[0123] An articulating endoscopic grasper 88 is passed through the
esophagus and into the stomach, and its distal end is fed into the
distal end of a tissue pocket 72 until it exits the pocket's
proximal end. The grasper 88 engages one of the guidewires 86 and
pulls the guidewire through the tissue pocket such that the distal
end of the guidewire extends out the pocket's distal end. The
procedure is repeated for each guidewire. Outside the body, each
leg 16 of the implant 10 is attached to the proximal end of one of
the guidewires. The grasper 88 then engages the distal ends of the
guidewires 86 and draws the distal ends 102 of the guidewires 86
out of the body, thereby towing the implant through the esophagus
towards the stomach. As the implant 10 approaches the stomach, the
distal ends of the guidewires 86 are individually manipulated to
separately draw each leg 16 into a corresponding one of the tissue
pockets 72.
[0124] Although anchoring of an implant using tissue pockets has
been described with respect to implant 10, it should be kept in
mind that other types of implants may also be retained using one or
more tissue pockets. For example, a drug-eluting capsule may be
positioned within a tissue pocket, or a drug-eluting device may
include a capsule attached to one or more anchoring members that
are retained within tissue pockets. Similar arrangements may be
configured for other forms of diagnostic or therapeutic implants of
the types mentioned above.
[0125] Alternative Methods
[0126] FIGS. 17 through 24 and 34A through 36F show alternative
ways in which a stomach wall may be re-shaped to facilitate implant
retention.
[0127] The configuration shown in FIG. 17 is advantageous in that
it can be used without sutures or other physical attachments
between the implant or body tissue, although it can also be used
with partial thickness sutures or anchors (which only go through a
portion of the wall thickness) or "full thickness" sutures or
anchors that penetrate through the full thickness of the wall of
the gastro-esophageal junction, esophagus, or stomach.
[0128] Referring to FIG. 17, components positionable within the
stomach include a hourglass shaped liner 90 having a waist section
92, and an implant such as pouch 2 positioned within the liner 90.
Preferably, the contour of the liner 90 silhouettes that of the
proximal portion of the pouch 2 as shown. The liner 90 is
sufficiently rigid to restrict movement of the pouch 2 up or down
within the stomach.
[0129] A ring 94 is positioned on the exterior surface of the body
wall surrounding the waist portion 92 of the hourglass liner 90,
such that it causes the body wall tissue to conform to the
hourglass shape of the liner 90, altering the shape of the stomach
by creating a stricture as shown. If necessary, the ring 94 may be
secured in place using partial or full thickness . sutures, barbs,
clips etc. The ring 94 may have features similar to the collar 56
described in connection with FIG. 31G below.
[0130] The relative positions of the ring 94, liner 90 and pouch 2
are such that the ring holds the liner 90 in position, and the
liner in turn holds pouch 2 in position. Optional mounting studs 96
may be connected to the pouch 2 and sutured through the liner 90 to
the body wall using partial or full thickness sutures. Further
details of studs of this type are described in connection with
FIGS. 29A-29F. The liner 90 protects the mucosal lining of the
stomach against erosion, and both the liner 90 and the ring 94 are
themselves sufficiently flexible to prevent/minimize tissue erosion
caused by their own surfaces.
[0131] An optional feature in the FIG. 17 configuration includes a
fundal component 98 extending in a distal direction from the liner
90. The fundal component 98 functions to reduce the area of the
fundus exposed to ingested food. Over time, the presence of the
fundal component may cause cells within the stomach to decrease
their production of Ghrelin, the hormone that causes feelings of
hunger. Thus, the overall level of hunger experienced by a patient
will decrease and may result in weight loss by the patient. Contact
between the fundal component and surrounding tissue may
additionally aid in weight loss by causing the patient to
experience sensations of fullness.
[0132] Another optional feature in the FIG. 17 configuration
includes a proximal chute 100, which extends the pouch 2 into the
esophagus. This restricts. dilatation of the stomach in the region
above the ring 94 and thus provides additional restriction against
overeating by the patient.
[0133] Another configuration shown in FIG. 18 is similar to the
FIG. 17 configuration, but it adds sutures 102 extending between
tissue above and below the ring 94 to form plications 104 in the
tissue to retain the ring in place. The plications 104 are formed
by grasping tissue above and below the ring, and then suturing the
grasped bunches of tissue together (see FIGS. 12A and 12B and
associated discussion). Obviously, in this and each of the
described embodiments staples or clips may be used in place of the
sutures. Pledgets or anchors 106, which may be of a type described
below, may be attached to the. free ends of the sutures to prevent
them from sliding through the tissue. Over time, the serosal and/or
mucosal tissue layers contacting one another as a result of the
plications will adhere together at regions labeled 108 and thereby
increase the strength of the plications. Tissue having, abrasion,
ablation etc. of the type described above may additional be used to
ensure optimal tissue adhesion. This embodiment may be varied by
eliminating the ring 94, and by simply using the plications to
create the narrowing in the stomach that retains the hourglass
liner 90 and the pouch 2.
[0134] FIG. 19 shows a variation of the FIG. 18 configuration in
which all components may be implanted endoscopically, thereby
eliminating the need for a laparoscopic or surgical step.
[0135] In the FIG. 19 embodiment, the ring 94 is positioned within
the stomach, surrounding the hourglass liner 90 and pouch 2 as
shown. Plications 104 are formed using sutures 102 (or clips,
staples, etc.) applied from within the stomach to retain the ring
94 as shown. In the 30 FIG. 18 and 19 embodiments, bioabsorbable
sutures may be used such that once adhesion occurs across the
plications, the sutures may be absorbed by the body, leaving the
ring 94 captured by the body tissue alone. Although in each of the
FIG. 17-FIG. 19 configurations the ring 94 may be proportioned to
affect stomach finction or eating behavior, it may be desirable to
proportion the ring 94 to have no such effect, so that when the
pouch 2 is removed by the physician, the ring 94 may be left in
place without interfering with normal eating by the patient.
[0136] FIG. 20A is a top perspective view looking down into a
stomach. The figure shows plications 104 used to retain the ring
94. The plications 104 may be spaced apart around the circumference
of the ring 94 as shown. FIG. 20B illustrates that the sutures may
be passed through only the interior mucosal layer of tissue as
indicated by suture line 102a, or through the interior mucosal and
exterior serosal layers of tissue as indicated by suture line
102b.
[0137] As discussed in connection with FIGS. 18 and 19, the ring 94
may be used to "shape" the stomach in order to restrain a
restrictive device and/or associated component (e.g. liner 90)
against migration within the stomach. As another example shown in
FIG. 20C, the ring 94a may be more disk-like and include windows
110 for receiving the plication tissue as well as an integral or
detachable restrictive orifice 114. Preferably, the exterior
perimeter of the ring seals against the surrounding tissue
sufficiently to prevent passage of large amounts of food between
the perimeter and adjacent tissue.
[0138] The ring 94 may also function as an anchor to which the
implant may be attached using sutures, clips etc. In yet another
alternative shown in FIG. 20D, bars 116 (or hooks, individual
rings, hooks, buttons, barbs etc.) may be supported using tissue
plications 104 and a restrictive device may be mounted to them
during the same or a subsequent procedure. Because each of these
embodiments relies primarily on tissue plications to support the
implant, reliance on sutures or clips to connect the implant to the
tissue may be minimized or even eliminated. This may in turn
increase the amount of time that the implant will remain in place
within the stomach.
[0139] FIGS. 21A and 21B illustrate that a plication 104 may be
formed without a ring, bar or other component simply by forming a
fold in the tissue and passing a suture 102 through the fold.
Pledgets 118 may be connected to the ends of the suture 102 to
prevent it from slipping out of the tissue. The plications 104 may
be used to "shape" the stomach to support the liner 90 as shown,
such as in an arrangement similar to those shown in FIGS. 18 and
19.
[0140] FIGS. 22A through 24 show additional arrangements in which a
ring or band may be used to facilitate retention of an implant. In
the arrangement of FIG. 22A, rings 94 or restrictive bands are
positioned above and below an implant 2a to provide "stops" that
prevent proximal and distal movement of the device within the
stomach. A similar configuration using only a ring 94 below the
implant 2b is shown in FIG. 22B. As a third alternative, the rings
94 may be eliminated and plications may instead be formed in tissue
above and below (or only below) the implant to prevent its
migration.
[0141] In FIG. 23, a ring 94 or band is again positioned below the
implant to create a stop against distal migration of the implant.
In this configuration, the implant 2c may take the form of an
inflatable or self-expanding balloon 120 that is free floating in
the region above the ring 94. The balloon 120 occupies a large
percentage of the gastro-esophageal junction region and thus
restricts food intake by only allowing food to pass through the
spaces between the balloon and the surrounding body wall as
indicated by arrows.
[0142] FIG. 24 shows another variation of the FIG. 22B embodiment
in which the ring 94 includes magnetic elements that are of the
same polarity as magnet elements in the proximal portion of the
implant 2d. Thus, repulsive forces between the implant 2d and the
ring 94 prevent distal movement of the implant 2d.
[0143] FIG. 25 shows an arrangement of components intended to form
a framework within the stomach that an implant device may later be
attached to. The components include a mesh band 122 positionable
around the interior wall of the stomach. Interior pledgets 124 are
spaced apart along the interior wall of the mesh band 122. Exterior
pledgets 126 are spaced apart along the exterior wall of the
stomach. The pledgets 124, 126 are connected to the mesh band by
sutures 128. Over time, the mesh band will migrate into the wall
tissue. Exterior pledgets 126 prevent the mesh band from migrating
completely through the wall tissue, while the interior pledgets 124
prevent the mesh band from moving inwardly and separating from the
wall tissue in the stomach interior. Eventually, the mesh band will
become encapsulated within the wall tissue and form a sturdy
structure to which implants such as pouch 2 may be attached using
sutures, clips or other devices.
[0144] FIGS. 34A and 35A illustrate embodiments in which the
stomach wall tissue may be re-shaped to allow an implant to seat
against the re-shaped tissue. As shown in FIG. 34A, the stomach
wall may be re-shaped to create a tunnel 220 extending from the
esophagus E into the stomach S. The tunnel 220 may be formed
endoscopically or surgically by suturing/stapling tissue along line
222. As illustrated in FIG. 34A, a restrictive device 224 may
include an expandable stent-like structure positionable within the
tissue tunnel 220 formed from re-shaped wall tissue.
[0145] Referring to FIG. 35A, an alternative re-shaping method may
including forming one or more suture/staple lines 226 extending
into the stomach to form a location within which an implant may
seat. For example, a restrictive pouch 228 or an obstructive
gastric balloon 230 may be seated within the created location such
that the re-shaped wall tissue prevents the implant from descending
into the intestinal tract. In the FIG. 34A and 35A embodiments, the
tissue surfaces along the suture/staple lines will eventually
adhere together. If desired, the orientation of the suture/staple
lines may be selected such that while the re-shaped tissue provides
a platform for supporting an implant that causes a patient to eat
less, removing the implant will allow the person to eat without
experiencing restriction caused by the re-shaped tissue.
[0146] FIGS. 36A through 36F illustrate another method in which the
stomach wall may be re-shaped for retention of an implant.
According to this method, a circumferential ridge of tissue may be
formed around the interior stomach wall, such as at the
gastro-esophageal junction region, and the circumferential ridge
may be used to retain the implant. Referring to FIG. 36B, a serosal
plication may be formed by engaging a region of the interior
stomach wall using an endoscopic grasper 240, hook, pronged
instrument, or similar device. By pulling the engaged wall region
inwardly, sections of external serosal tissue are drawn into
contact with one another to form serosa-to-serosal plication 242
(FIG. 36D). With the plication engaged by the endoscopic
instrument, a suture 243, staple or other fastener is passed
through the plication 242 as shown in FIG. 36B to retain the
plication. A plurality of the plications 242 are formed around the
interior circumference of the stomach, thus creating a
circumferential ridge 244 (FIG. 36E) of plicated tissue encircling
the wall of the stomach. Over time, the opposed serosal layers form
an adhesion. A restrictive implant 246 is then positioned in the
stomach, proximally of the ridge 244 as shown in FIG. 36F.
[0147] In one embodiment, the circumferential ridge may finction as
a physical barrier that prevents migration of the implant away from
the proximal stomach, similar to the manner in which the wall
re-shaped by ring 94 in FIG. 22B prevents migration. Alternatively,
the implant may be physically connected to the ridge 244 using
sutures 248, staples or clips as shown in FIG. 36F. This may be
performed by grasping the ridge 244 using an endoscopic instrument
and drawing the ridge 244 in the direction of the esophagus,
advancing the implant 246 into contact with the ridge 244 while
retaining the ridge with the endoscopic instrument, and passing
sutures/staples etc. through the implant and the ridge 244.
Pledgets 250 may be used as shown in order to distribute forces
over a larger surface area as described elsewhere in this
application.
[0148] Attachment of the implant 246 may be performed during the
same procedure in which the circumferential ridge is formed, or at
a later date to permit the adhesions to form before the ridge is
subjected to the stresses that will be imparted against it by the
implant.
[0149] FIGS. 37A through 37D illustrate a slightly modified method
for using serosal-to-serosal plication of wall tissue to form a
circumferential ridge, and for securing an implant to the ridge.
Referring to FIGS. 37A and 37B, tissue is plicated using an
endoscopic instrument 240a which includes prong members 241. To
form a plication, prong members 241 are used to pull stomach wall
tissue in a proximal direction while a suture needle 243 or other
fastening instrument advanced distally to drive sutures, t-bars,
rivets or other fasteners downwardly into the plicated tissue as
shown in FIG. 37B. Force dissipating elements such as pledgets may
be used to dissipate forces against the tissue surface.
[0150] Referring to FIG. 37C, a few (for example two to four) such
plications are formed around the wall to form circumferential ridge
244a (FIG. 37C).
[0151] Introduction of an implant may be performed immediately
following formation of the plications, or at a later date after the
opposed serosal tissue has adhered as described above. In one
method of introducing the implant, a plurality of wires 252 having
hooked distal ends are passed through a sheath 254 and used to hook
the circumferential ridge 244a. Implant 246a, which has a plurality
of small holes (not shown), is slipped over the wires by
telescoping each of the small holes over a corresponding one of the
wires 252. The implant 246a is compressed and passed into the
sheath 254, and is then advanced through the sheath into contact
with the ridge 244a while tension is maintained on the wires 252.
The implant 246a may be physically connected to the ridge 244a
using sutures, t-bars, or other fasteners as described in
connection with FIG. 36F. This step may be performed with continued
application of tension on the wires 252. As shown in FIG. 37D, a
portion of the implant 246a is thus left seated against the ridge
as shown in FIG. 37D.
[0152] Although various types of implants may be retained using
this method as well as the other methods described in this
application, the implant 246a is shown in FIG. 37D as a ring 247
that may be similar to ring 18a found on implant 10a of FIG. 4A. As
with the other embodiments that utilize rings, the ring may itself
function as a restrictive device, or a restrictive device may be
used in combination with the ring. For example, a restrictive
device may be attached to, hung from, seated against, or inserted
into the ring 247.
[0153] Ring 247 may be formed of any of the materials described
above in connection with pouch 2, including silicone, polyurethane,
or one of a variety of types of polymers. A reinforcing element
formed of an annular band of stainless steel, polymer, shape memory
materials such as nitinol, shape memory alloys, or shape memory
polymers may extend through the ring 247. The ring may be
constructed so as to be self-expanding, so that it will spring
radially open into an expanded condition upon ejection from a
deployment sheath. Alternatively, the ring may be inflatable using
an inflation medium such as a gas or liquid (e.g. saline), or using
a photochemically or thermally curable polymer. As another
alternative, the ring may be formed of a material that will degrade
or erode within the body over a period of time.
[0154] The ring 247 may include an apron 256 having an annular
groove 258 as shown in FIG. 37E. Various materials may be used for
the ring, including PET, nylon or any of the other materials
described herein. A restrictive insert 260, which may have
properties similar to pouch 2 described above, is insertable into
the ring 247 as shown. The restrictive insert 260 has a restrictive
opening proportioned to slow the rate at which food passes through
the insert and into the stomach. A selection of restrictive inserts
may be provided, thus giving the physician a choice as to how much
restriction should be used for a particular patient.
[0155] Insert 260 includes a rim 262 that may be snapped into
groove 258 to engage the ring and insert. FIG. 37F is a view
looking down the esophagus into the stomach, showing the implant
246a positioned against the plication 244. FIG. 37G is a similar
view showing the implant 246a after the insert 260 has been
attached to it.
[0156] In one method of using this type of implant, the physician
may implant the ring 247 and delay placement of the insert 260
until the patient has had several days to adjust to the presence of
the implant. Later, the insert 260 may be endoscopically passed
down the esophagus and into the stomach, and be snapped into place.
On a later date, the physician may choose to remove the insert 260
and replace it with a more restrictive (i.e. one having a smaller
exit orifice) or a less restrictive insert (i.e. one having a large
exit orifice), depending on the needs of the patient. If desired,
the insert may be formed of a material that degrades or erodes
after a period of time, thereby eliminating the need for removal of
the insert.
[0157] External Reinforcements
[0158] Several components described in this disclosure function as
external reinforcement devices. As discussed in FIG. 2B, the
implant such as pouch 2 may be sutured or clipped into place by
passing a full thickness suture 8a from the pouch 2 through the
adjacent stomach tissue and back to the pouch. However, in some
patients it may be desirable to "buttress" the sutures 8a by
passing them through an external reinforcement device positioned on
the exterior surface of the wall. Some of these types of
reinforcing devices have been mentioned in the preceding
section.
[0159] Examples of external reinforcement devices include pledgets
130 (FIG. 26A) or t-bars 132 (FIG. 26B), each of which distributes
forces imparted against the suture over a larger surface area.
Pledgets or t-bars may be quite large (e.g. 10-30 mm in diameter)
or fairly small (e.g. 1-2 mm in diameter) as dictated by the
particular application. Examples of material suitable for the
pledgets or t-bars include silicone, felt, and/or the materials
listed above for use in constructing the pouch. T-bars may also be
formed of metallic bars crimped onto suture ends.
[0160] During implantation of the pledgets 130, the implant such as
pouch 2 (FIG. 2A) may be introduced into the stomach
endoscopically, while the pledgets are placed in contact with the
exterior of the stomach a laparoscopic or surgical approach.
Sutures are passed from within the stomach, through the stomach
wall, through the pledgets, and back to the interior of the
stomach. If desired, this may be carried out in two procedures: for
example a first laparoscopic procedure in which pledgets are
laparoscopically sewn onto the exterior wall of the stomach, and a
second endoscopic procedure in which the implant is passed through
the esophagus and into the stomach and in which sutures are passed
between the implant, stomach wall, and pledgets.
[0161] During implantation of the t-bars, the end of the suture
having the t-bar attached to it is endoscopically positioned
adjacent the exterior wall of the stomach, and the free end is sewn
through the stomach wall and the internally positioned implant
wall.
[0162] FIG. 27A shows an alternative external reinforcement device
which takes the form of a "moly bolt" type fasteners 134 that may
be introduced endoscopically through the esophagus into the
stomach. Referring to FIG. 27B, during implantation, the implant
(e.g. pouch 2) is positioned against the stomach and fasteners 134
are passed from the interior of the implant through the implant
wall and through the stomach wall. Each fastener 134 includes an
internal wire or string (not shown) that is attached to its distal
portion 136. The distal portions 136 of the fasteners 134 are
expanded into the position shown in FIG. 27C by pulling on these
wires or strings, thereby anchoring the fasteners 134 in place.
[0163] Other types of external reinforcement devices are shown in
FIGS. 28A through 28C. In the FIG. 28A embodiment, inflatable
balloons 138 may be passed through the implant and stomach wall
from the stomach interior (in similar fashion to that shown in FIG.
27B for the moly bolt type fasteners), and then subsequently
inflated such that the expanded balloons remain on the exterior
surface of the stomach.
[0164] FIGS. 28B and 28C illustrate alternatives to the pledgets
130 described with respect to FIG. 26A. As with the FIG. 26A
pledget, the pledgets of FIGS. 28B and 28C are positioned on the
exterior wall of the stomach and sutures are passed through the
pledgets to attach the implant to the stomach wall. As shown in
FIG. 28B, the pledgets 130a may have roughened surfaces to prevent
them from slipping through the suture openings in the stomach wall.
FIG. 28C illustrates that pledgets 130b may be formed of mesh or
other material known to promote cell ingrowth, such that over time
the stomach wall tissue will grow into the pledget to enhance
anchoring.
[0165] As another alternative to the pledget 130, a pledget may be
formed in situ by injecting a drop of gel onto the exterior surface
of the stomach, where the gel is a type that will solidify on the
tissue surface. The gel may be delivered laparoscopically by
approaching the stomach wall from outside the stomach, or it may be
delivered endoscopically by injecting the gel using a needle passed
through the wall of stomach from the stomach interior. Once the gel
hardens into a pledget, the implant may be anchored to the hardened
gel pledget using sutures, clips, etc. passed through the stomach
wall. As yet another alternative, the gel may be injected in
between the serosal and mucosal layers of stomach wall tissue to
form the gel pledget within the stomach wall.
[0166] Naturally, each of the external reinforcement devices
described above must in some way be connected to the implant
located in the interior of the stomach. FIG. 29A shows a "stud"
type fastener 96 of a type that may be attached to a implant within
the stomach, and that is also connected to an external
reinforcement device (not shown in FIG. 29A). Fastener 96 includes
a first button 142 having a pin 144, and second button 146 having a
bore for receiving the pin 144. As shown in FIG. 29B, pin 144 is
passed through the wall of the implant (e.g. pouch 2) such that one
of the buttons 142 is on the exterior of the implant and the other
button 146 is on the exterior of the pouch. Fastener 96 is then
connected to an external reinforcement device such as a pledget 130
positioned on the exterior wall of the stomach as shown.
[0167] As shown in FIGS. 29B through 31F, various devices may be
used to connect the fastener 96 to the pledget 130. It should be
noted that although the implant is only shown in FIG. 29B, it
should be assumed that in FIGS. 29C through 29F implant is attached
to the fastener such as in the manner shown in FIG. 29B.
[0168] Referring to FIG. 29B, a suture 148 may be sewn through the
stomach wall and attached to both the fastener 96 and the pledget
130 using suitable means. For example, to secure the suture 148 to
the fastener 96, the suture may be tied to the pin 144, or it may
be threaded through an opening in the button 142 and into a bore in
the pin 144, and the pin 144 may be crimped down to secure the
suture within it. A variety of types of sutures may be used for
this purpose, for example monofilament, braided suture, cotton,
silk, or bioabsorbable suture. The length of suture between the
fastener 96 and pledget 130 may be highly tensioned or loosely
tensioned. Referring to FIG. 29C, if it is desirable to keep the
suture in tension, the pledget 130 and fastener 96 may be
magnetized to the same polarities such that they will resist
movement towards one another as indicated by arrows and to thus
maintain the tension of the suture. Alternatively, as shown in FIG.
29D the pledget 130 and fastener 96 may be magnetized to opposite
polarities such that the attraction between them holds both the
pledget, implant, and fastener against the stomach tissue. This
embodiment may utilize a rigid post 150 (e.g. stainless steel,
nitinol, plastic) extending between the pledget 130 and fastener 96
to protect the tissue from being compressed between the pledget 130
and fastener 96. As another alternative, the rigid post 150 may
provide the connection between the pledget 130 and fastener 96,
without the use of magnetism. As shown in FIGS. 29E and 29F, a
physical connector between the pledget 130 and fastener 96 may be
formed of a material that promotes tissue ingrowth, such as a chain
152a or mesh 152b formed of nitinol, stainless steel, polymer, or
bio-absorbable material.
[0169] Referring to FIG. 30A, external reinforcement may
alternatively be provided by a combination of self-balancing
anchors. This may take the form of a pair of balloon pledgets 154a,
154b connected by a suture 148 extending through the stomach wall
such that one balloon 154a is within the stomach and the other
balloon 154b is outside the stomach. The suture preferably extends
through the interior of each balloon and is attached to the balloon
at a point that is furthest from the adjacent stomach wall. The
implant (not shown) is connected to the suture adjacent to the
balloon 154a positioned within the stomach. As illustrated in FIG.
30B, the balloons are proportioned such that when force draws one
of the balloons 154a away from the stomach wall (such as when the
implant pulls inwardly in response to food pressure) the other
balloon compresses and flattens against the wall, thereby
increasing the effective pledget size and thus distributing the
force over a larger area. It should be noted that the balloon
pledgets could be replaced with other resilient structures such as
three-dimensional mesh, stent-like frame structures, deformable
elastomers, or other structures that will deform when subjected to
force but that will resume their original shape upon release of the
force.
[0170] Collars
[0171] Another form of external reinforcement device is an external
collar encircling the exterior of the stomach. FIGS. 31A through
31I show a variety of collar configurations. Some of these
configurations are intended to be physically connected to the
implant using sutures or other connection methods, including those
shown in FIGS. 29B-29F for connecting the implant to the
pledget-type devices. These connections may be made with or without
the stud fasteners of FIG. 29A. When connected to the implant, the
collars may finction like the pledgets 130 to facilitate even
distribution of forces around the implant. The collars and pledgets
may also be combined such that a collar encircles the exterior
stomach wall and pledgets on the exterior surface of the collar are
connected to the device using sutures passed through the collar and
the stomach wall. In this configuration, the collar aids in force
distribution and also prevents the pledgets from eroding the
stomach wall.
[0172] For other configurations, the collar is not physically
connected to the implant, but may be positioned to restrict
movement of the device.
[0173] The collar embodiments of FIG. 31A through 31F are designed
to have the implant device anchored to them at anchor points 156.
The collars are intended to be flexible so as to more evenly
distribute forces rather than to have significant forces build at
any one anchor point. In the FIG. 31A embodiment, the flexibility
of the collar 158 comes from its pleated structure. The implant 2
within the stomach is attached to the collar at 158 anchoring
points 156. The FIG. 31B collar 160 is formed of a coil spring. In
both of these embodiments, the flexibility of the collar allows the
anchoring points 156 to move with the stomach rather than allowing
forces at the anchor points to build when such stomach movement
occurs.
[0174] Similar properties are found in the FIG. 31C-31E
embodiments. In the FIG. 31C embodiment, the collar 162 is formed
of material such as stainless steel, polymeric, or nitinol mesh
that has flexibility in multiple directions. The FIG. 31E collar
164 is also capable of stretching in multiple direction due to its
use of a thin flexible polymeric sheet. In the FIG. 31F embodiment,
the collar 166 includes a plurality of individual pledgets 168
mounted to an elastic member 170. FIG. 31D shows an expandable
collar 172 formed of telescoping components 174a, 174b. Spring
members 176 connect the components 174a, allowing the collar to
expand and contract with the stomach.
[0175] Referring to FIGS. 31G, 31H and 31I, the collar may be a
simple round or oval-shaped ring. It may have a torroidal shape
like the collar 178 of FIG. 31G, or a tapered shape like the collar
180 of FIG. 31H which conforms to the tapered shape of the exterior
stomach wall. The collar may be rigid or flexible. Alternatively,
referring to FIG. 31I, collar 182 may be flexible but include a
tensioning cable that may be activated to increase the rigidity of
the collar. With these embodiments, sutures attached to the implant
may be sewn through the stomach wall and be attached to the collar,
or the collar may remain physically separate from the implant but
function to maintain the implant's position as discussed in greater
detail in connection with FIG. 17.
[0176] FIG. 32A shows a front cross-section view of the collar 178
surrounding an exterior stomach wall. As shown, collar 178 may have
a D-shaped cross-section to minimize tissue trauma.
[0177] Because the collar is intended to be wrapped around the
stomach, its design must be such that it can be introduced into the
stomach cavity in an elongate configuration, and then have its free
ends attached to form it into a loop around the stomach. As
illustrated in FIG. 32B, collar 178 may include a slot 184 at one
end and a tab 186 at the opposite end. Tab 186 is engageable within
the slot to form the collar in to a loop. Raised buttons 188 on the
tab 186 may snap into recesses 190 in the slot to lock the collar
in the closed loop. The size of the collar may be pre-selected by
cutting the tab 186 to the desired length before it is inserted
into the slot.
[0178] As an alternative shown in FIG. 32C, collar 178 may include
a sleeve 192 that is slidable over the collar as indicated by
arrows to retain the ends of the collar 178 together once the
collar has been positioned around the stomach.
[0179] Alternative Restrictive Devices
[0180] The flexible nature of the pouch 2 allows it to move in
response to stomach movement, thereby producing little or no stress
on the sutures or anchors holding the pouch in place. This is
believed desirable towards minimizing the chance that the implant
will detach from the stomach wall. Other restrictive devices and
methods of retaining them are shown in FIGS. 20C, 22A, 22B, 23 and
24.
[0181] FIGS. 32A through 32D show restrictive devices having
alternative features which may likewise minimize risk for
detachment. These devices may be used with or without the various
attachment devices described in this application.
[0182] FIG. 32A shows a rigid ring 194 positionable in the
gastro-esophageal junction region and attached using sutures or
other means similar to those described for pouch 2. The ring 194
may be flexible for endoscopic insertion, and then convertable
(e.g. by inflation to a high pressure using a detachable inflation
tube) to a rigid ring following implantation so as to restrict
movement of the stomach. Such restriction of stomach movement is
intended to minimize stresses on the sutures or anchors and thus
reduce the risk of detachment.
[0183] Ring 194 includes a flow-restrictive orifice 196 through
which food passes. If desired, the ring 194 may include a
circumferential region surround the orifice 196 that is
independently inflatable or deflatable to adjust the diameter of
the exit orifice.
[0184] FIG. 32B shows an alternative restrictive device 198 which
has a tapered configuration, such that forces imparted against the
device by the stomach (as indicated by arrows) as well as forces
imparted by food passing through the tapered passageway 200 in the
device 198 will cause the device to seat more tightly within the
gastro-esophageal junction region. As with the other embodiments,
sutures, anchors, clips, adhesives etc. may be used to attach the
device 198 to the stomach walls.
[0185] FIG. 32C shows a restrictive device 202 that is pleated
between anchor points 204. The pleats allow the device 202 to
expand in response to forces against it, and thus minimize stress
at the anchor points. As with the other restrictive devices, device
202 includes a restrictive orifice 206.
[0186] Restrictive device 208 of FIG. 32D is formed of a plurality
of individual members 210, each of which is separately attachable
to the tissue of the gastro-esophageal junction using sutures,
clips or the like at anchoring points 212. The individual members
210 collectively form a restriction at the gastro-esophageal
junction so as to minimize food intake by the patient. The amount
of restriction may be reduced by reducing the size of the members
210. Because the individual members 210 are physically separate
from one another, movement of the stomach will produce little or no
stress on the anchors.
[0187] Tissue Modification to Increase Tissue Strength
[0188] If desired, the tissue of the stomach, esophagus, or
gastro-esophageal junction may be treated using techniques such as
mechanical abrasion, RF ablation/coagulation, laser ablation, or
chemical abrasion that can strengthen the tissue such as by forming
a layer of scar tissue. Cyanoacrylate coatings or growth inhibitors
may also be applied to the tissue to strengthen it. These forms of
tissue modification may be used in embodiments in which implant
devices are physically connected to the tissue using sutures,
staples, etc, or in embodiments in which there is no such physical
connection but in which increased tissue strength is desired for
prevention of erosion.
[0189] Various components and methods have been described herein.
These embodiments are given by way of example and are not intended
to limit the scope of the present invention. It should be
appreciated, moreover, that the various features of the embodiments
that have been described may be combined in various ways to produce
numerous additional embodiments. Also, while various materials,
dimensions, shapes, implantation locations, etc. have been
described for use with disclosed embodiments, others besides those
disclosed may be utilized without exceeding the scope of the
invention. For example, the retention methods and devices are not
limited to use within the gastrointestinal system and may be used
for implants placed elsewhere in the body.
* * * * *