U.S. patent application number 17/540749 was filed with the patent office on 2022-04-28 for single-insertion, multiple sampling biopsy device with linear drive.
This patent application is currently assigned to C.R. Bard, Inc.. The applicant listed for this patent is C.R. Bard, Inc.. Invention is credited to Timothy J. Coonahan, Jon Taylor, Stanley O. Thompson.
Application Number | 20220125418 17/540749 |
Document ID | / |
Family ID | |
Filed Date | 2022-04-28 |
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United States Patent
Application |
20220125418 |
Kind Code |
A1 |
Thompson; Stanley O. ; et
al. |
April 28, 2022 |
SINGLE-INSERTION, MULTIPLE SAMPLING BIOPSY DEVICE WITH LINEAR
DRIVE
Abstract
A single-insertion, multiple sampling biopsy device for
insertion into a host includes an outer cutting cannula that has an
inner lumen, a cutting distal end, and a proximal sample receiving
port. The device includes a stylet extending at least partially
within the inner lumen of the outer cutting cannula and along a
longitudinal axis of the outer cutting cannula. A sheath extends at
least partially within the inner lumen of the outer cutting
cannula. A stylet tip is attached to a stylet rail. Each of the
sheath and the stylet rail extends along the longitudinal axis. The
stylet tip extends in the distal direction beyond the distal end of
the outer cutting cannula. A drive unit is configured to translate
each of the cutting cannula, the sheath, and the stylet relative to
the stylet tip in proximal and distal directions. The stylet rail
remains stationary relative to the drive unit.
Inventors: |
Thompson; Stanley O.; (New
Boston, NH) ; Coonahan; Timothy J.; (Sterling,
MA) ; Taylor; Jon; (Groton, MA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
C.R. Bard, Inc. |
Franklin Lakes |
NJ |
US |
|
|
Assignee: |
C.R. Bard, Inc.
Franklin Lakes
NJ
|
Appl. No.: |
17/540749 |
Filed: |
December 2, 2021 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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16003877 |
Jun 8, 2018 |
11219431 |
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17540749 |
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14318081 |
Jun 27, 2014 |
10010307 |
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16003877 |
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13592062 |
Aug 22, 2012 |
8771200 |
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14318081 |
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11997403 |
Jul 7, 2008 |
8262585 |
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PCT/US2006/031325 |
Aug 10, 2006 |
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13592062 |
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60707289 |
Aug 10, 2005 |
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International
Class: |
A61B 10/02 20060101
A61B010/02; A61B 90/00 20060101 A61B090/00 |
Claims
1-58. (canceled)
59. A single-insertion, multiple sampling biopsy device for
insertion into a host, comprising: an outer cutting cannula having
an inner lumen and extending along a longitudinal axis from a
proximal end to a distal end, the outer cutting cannula having a
cutting distal end, the outer cutting cannula having a proximal
sample receiving port, the configured to translate in a proximal
direction and a distal direction; a stylet extending along the
longitudinal axis, the stylet extends at least partially within the
inner lumen of the outer cutting cannula, the stylet configured to
translate in the proximal direction and the distal direction; a
sheath extending along the longitudinal axis, the sheath extends at
least partially within the inner lumen of the outer cutting
cannula, the sheath configured to translate in the proximal
direction and the distal direction; a stylet tip attached to a
stylet rail, the stylet tip extends in the distal direction beyond
the distal end of the outer cutting cannula, the stylet rail
extends along the longitudinal axis; and a drive unit configured to
translate the outer cutting cannula, the sheath, and the stylet
relative to the stylet tip, the stylet rail remains stationary
relative to the drive unit.
60. The single-insertion, multiple sampling biopsy device of claim
59, wherein the stylet rail is disposed between the stylet and the
sheath.
61. The single-insertion, multiple sampling biopsy device of claim
59, wherein the stylet rail extends at least partially within the
outer cutting cannula.
62. The single-insertion, multiple sampling biopsy device of claim
59, wherein the sheath comprises a beveled distal end.
63. The single-insertion, multiple sampling biopsy device of claim
59, wherein the sheath is configured to translate along the stylet
rail.
64. The single-insertion, multiple sampling biopsy device of claim
59, further comprising a second stylet rail.
65. The single-insertion, multiple sampling biopsy device of claim
59, further comprising: a bulkhead having a bulkhead distal end, a
bulkhead proximal end, a length that extends from the bulkhead
distal end to the bulkhead proximal end, and a vacuum passage
extending along the longitudinal axis through the length of the
bulkhead.
66. The single-insertion, multiple sampling biopsy device of claim
65, wherein the bulkhead is disposed inside the stylet.
67. The single-insertion, multiple sampling biopsy device of claim
66, wherein, collectively, the stylet tip, the stylet, and the
bulkhead are configured to form a longitudinal port.
68. The single-insertion, multiple sampling biopsy device of claim
67, wherein the drive unit is configured to translate and rotate
the outer cutting cannula to expose the longitudinal port.
69. The single-insertion, multiple sampling biopsy device of claim
67, wherein the drive unit is configured to distally advance the
sheath to enclose the longitudinal port.
70. A single-insertion, multiple sampling biopsy device for
insertion into a host, comprising: an outer cutting cannula having
an inner lumen and extending along a longitudinal axis from a
proximal end to a distal end, the outer cutting cannula having a
cutting distal end, the outer cutting cannula having a proximal
sample receiving port, the configured to translate in a proximal
direction and a distal direction; a stylet extending along the
longitudinal axis, the stylet extends at least partially within the
inner lumen of the outer cutting cannula, the stylet configured to
translate in the proximal direction and the distal direction; a
sheath extending along the longitudinal axis, the sheath extends at
least partially within the inner lumen of the outer cutting
cannula, the sheath configured to translate in the proximal
direction and the distal direction; a first stylet rail; a second
stylet rail; a stylet tip attached to the first stylet rail and the
second stylet rail, the stylet tip extends in the distal direction
beyond the distal end of the outer cutting cannula, the first
stylet rail and the second stylet rail extends along the
longitudinal axis; and a drive unit configured to translate the
outer cutting cannula, the sheath, and the stylet relative to the
stylet tip, the first stylet rail, and the second stylet rail,
wherein the stylet tip, the first stylet rail, and the second
stylet rail are stationary relative to the drive unit.
71. The single-insertion, multiple sampling biopsy device of claim
70, wherein the first stylet rail is disposed between the stylet
and the sheath and the second stylet rail is disposed between the
stylet and the sheath.
72. The single-insertion, multiple sampling biopsy device of claim
70, wherein the first and second stylet rails extend at least
partially within the outer cutting cannula.
73. The single-insertion, multiple sampling biopsy device of claim
70, wherein the sheath is configured to translate along the first
and second stylet rails.
74. The single-insertion, multiple sampling biopsy device of claim
70, further comprising: a bulkhead having a bulkhead distal end, a
bulkhead proximal end, a length that extends from the bulkhead
distal end to the bulkhead proximal end, and a vacuum passage
extending along the longitudinal axis through the length of the
bulkhead.
75. The single-insertion, multiple sampling biopsy device of claim
74, wherein the bulkhead is disposed inside the stylet.
76. The single-insertion, multiple sampling biopsy device of claim
74, wherein a combination of the stylet tip, the stylet, and the
bulkhead forms a longitudinal port.
77. The single-insertion, multiple sampling biopsy device of claim
76, wherein the drive unit is configured to translate and rotate
the outer cutting cannula to expose the longitudinal port.
78. The single-insertion, multiple sampling biopsy device of claim
76, wherein the drive unit is configured to distally advance the
sheath to enclose the longitudinal port.
Description
PRIORITY DATA AND INCORPORATION BY REFERENCE
[0001] This application is a continuation of application Ser. No.
16/003,877 filed Jun. 8, 2018, now U.S. Pat. No. 11,219,431, which
is a continuation of U.S. patent application Ser. No. 14/318,081,
filed Jun. 27, 2014, now U.S. Pat. No. 10,010,307, which is a
continuation of U.S. patent application Ser. No. 13/592,062, filed
Aug. 22, 2012, now U.S. Pat. No. 8,771,200, which is a divisional
of U.S. patent application Ser. No. 11/997,403, filed Jul. 7, 2008,
now U.S. Pat. No. 8,262,585, which is a U.S. national phase of
International Application No. PCT/US2006/031325, filed Aug. 10,
2006, which claims benefit of priority to U.S. Provisional Patent
Application Ser. No. 60/707,289 filed Aug. 10, 2005, each of which
is incorporated by reference in its entirety.
FIELD OF THE INVENTION
[0002] This invention relates to a tissue biopsy sampling
device.
BACKGROUND OF THE INVENTION
[0003] It is sometimes desirable or necessary to obtain specimens
of tissue from humans and other animals, particularly in the
diagnosis and treatment of patients with cancerous tumors,
premalignant conditions, and other diseases or disorders. For
example, when it is discovered that suspicious conditions exist,
either by means of x-ray or ultrasound imaging in various tissues
of the body, a physician usually performs a biopsy to determine if
the cells at the suspected site are cancerous or benign.
[0004] A biopsy can be done either by an open or percutaneous
technique. Open biopsy is an invasive procedure using a scalpel, by
either a portion (incisional biopsy) being removed or the entire
mass (excisional biopsy) is removed. Percutaneous biopsy is usually
done with a needle-like instrument through a relatively small
incision, and can be performed by fine needle aspiration (FNA) or
through the taking of a core biopsy sample. In FNA biopsy,
individual cells or clusters of cells are obtained for cytologic
examination and can be prepared such as in a Papanicolaou smear. In
a core biopsy, a core or fragment of the tissue is obtained for
histologic examination.
[0005] Uncontaminated and intact tissue from the organ, lesion, or
tumor is preferred by medical personnel in order to arrive at a
definitive diagnosis regarding the patient's condition. In most
cases only part of the tissue in question needs to be sampled. The
portions of tissue extracted must be indicative of the organ,
lesion, or tumor as a whole. Often, multiple tissue samples from
various locations of the mass being sampled may be taken.
[0006] The percutaneous biopsy procedure can be performed utilizing
various techniques and devices. One such biopsy device can include
an inner stylet positioned inside an outer cannula, where the
stylet is able to slide into and out of the cannula. The stylet can
be a solid, pointed needle having a tissue sampling recess, and the
cannula can be a hollow, open-ended needle having a sharp tip. The
stylet and cannula can be manipulated cooperatively to capture a
tissue sample in the sample recess. Such existing devices can be
manually operated, semi-automated, and automated.
[0007] U.S. Pat. No. 6,485,436 shows a multiple sample biopsy
needle with a hydraulic mechanism that circulates fluid from the
tip of the needle back to a receiving basket or baskets. A
revolver-type array of receiving chambers is disclosed.
[0008] U.S. Pat. No. 5,827,305 shows a tissue sampling needle that
pushes a sample proximally using a saline wash. Samples remain
spaced apart within the needle such that the sequence of their
collection is preserved. Samples can also be removed from a port
while the needle remains in place. No mechanical transport
mechanisms or drives are disclosed.
[0009] U.S. Pat. No. 5,526,822 shows a transport system that uses a
cannula and knock-out pin combined with a vacuum source to shuttle
a tissue sample to a multiple-chamber cassette where it is knocked
out. The cannula is then repositioned for another sample. The
vacuum source is external. A revolving sample cassette is also
shown. A vent opening in each sample cylinder of the cassette is
provided to eject the fluid used to transport the tissue sample. A
removable disposable needle-bearing cassette interfaces with rotary
and linear drives by means of long gears and shuttles that cradle
the gears. Cutters operate in rotary and linear fashion (a
counter-rotating cutters embodiment is included) and the cannula
can be rotated to orient the sample opening.
[0010] U.S. Pat. No. 6,017,316 shows a transport system similar to
U.S. Pat. No. 5,827,822 in which a cutter transports with vacuum
assist. Multiple sampling with single insertion is described but
not automated multiple sample-handling. The details of a drive
system are not disclosed.
[0011] U.S. Pat. No. 6,193,673 shows a needle with a durable part
and a disposable part. An external cutting cannula rotates and
advances axially to cut a sample. The tissue cutter is driven
axially by a rack and pinion drive which are part of a durable
component. A cradle connects the rack to the cutting cannula.
[0012] U.S. Pat. No. 5,944,673 describes a tissue extractor that
rotates within a piercing needle to align with any one of multiple
receiving ports while obstructing the remaining ports. The tissue
sample is cut by advancing the cutter and removing by withdrawing
the extractor. A vacuum holds the tissue sample in place during the
removal of the tissue extractor from the cutter. The cutter rotates
as it advances.
[0013] It is known to obtain a single sample with a single
insertion. However, there are circumstances where there may be a
need to obtain more than one sample. While the known biopsy needle
can be re-inserted multiple times, such technique can cause pain
and scarring of the body site.
[0014] It is known to leave a marker at the biopsied site. To do
so, however, a physician or healthcare provider would typically
need to withdraw the biopsy needle and insert a different device to
leave a marker at the biopsied site. The additional step with the
marker device concurrent with the tissue sampling may not allow the
marker to be deposited at the actual biopsied site, which can lead
to inaccurate post-biopsy diagnosis.
[0015] There is a need in the art for improved systems for
performing multiple sample biopsies, particularly systems that are
amenable to self-contained designs and improved techniques for
sample extraction and handling. There is also a need for efficient
and precise marker delivery with minimal trauma.
SUMMARY OF THE INVENTION
[0016] The present invention provides for exemplary embodiments of
a single-insertion, multiple sampling biopsy device. The present
invention also provides for exemplary embodiments of a
single-insertion, multiple sampling device with integrated marker
release.
[0017] In one aspect, a single-insertion, multiple sampling biopsy
device includes an outer cannula, a stylet, a sheath and a drive
unit. The outer cannula extends along a longitudinal axis from a
proximal end to a distal end, the outer cannula having a cutting
end and a second through port proximal the cutting end. The stylet
is disposed in the outer cannula and configured to translate along
the longitudinal axis towards the distal and proximal ends in the
outer cannula. The stylet has a second bulkhead being in fluid
communication from a fluid source to the second bulkhead. The
sheath is disposed between the outer cannula and the stylet, the
sheath configured to translate along the longitudinal axis towards
the distal and proximal ends. The sheath is disposed inside the
outer cannula and configured to translate along the longitudinal
axis towards the distal and proximal ends. The drive unit is
coupled to the outer cannula, to transmit motive force to the
cutting tip. The inner stylet and sheath translate relative to the
outer cannula, and each other, via another drive unit.
[0018] In yet another aspect, a method of sampling biological
tissue with a biopsy device is provided. The device has four
elongated members that translate along a longitudinal axis between
a distal end and a proximal end. The method comprising: capturing a
biological sample in a chamber defined by two of the sheaths; and
translating the two sheaths as a single unit through the interior
first and fourth sheath to deliver the biological sample from the
distal end to the proximal end.
[0019] In yet a further aspect, a method of transporting a tissue
containing chamber with a biopsy device is provided. The biopsy
device has four elongated members that translate along a
longitudinal axis between a distal end and a proximal end. The
method can be achieved by: (a) exposing a first aperture of a
second sheath, the aperture having a chamber defined by a first and
second bulkhead, and floor of the second elongate member; (b)
providing a vacuum proximate the aperture; (c) enclosing the
aperture of the second sheath with first elongate member; and (d)
translating the chamber defined by the first, second, sheaths
through a substantial portion of the outer cannula to expose the
chamber in a proximal aperture formed through the outer
cannula.
[0020] A preferred embodiment can include a single-insertion,
multiple sampling biopsy device with an outer cannula extending
along a longitudinal axis from a proximal end to a distal end, the
outer cannula having a first port. A stylet may be provided and
disposed in the outer cannula and configured to translate along the
longitudinal axis towards the distal and proximal ends in the outer
cannula, the stylet having a second port. A sheath may be disposed
between the outer cannula and the stylet, the sheath configured to
translate along the longitudinal axis towards the distal and
proximal ends. A bulkhead may be disposed in the stylet and
configured to translate with the stylet along the longitudinal axis
towards the distal and proximal ends. A drive unit may be coupled
to at least one of the outer cannula, stylet, and sheath to
transmit motive force to at least one of the outer cannula, stylet,
sheath to move at least the stylet relative to the outer
cannula.
[0021] The bulkhead may include one or both of vacuum and
pressurized fluid supply in fluid communication with a passage
formed through the bulkhead. A fluid passage may be defined by the
inner surface of the stylet and the outer surface of bulkhead, the
fluid passage in fluid communication with one or more of a
pressurized fluid supply and vacuum supply. The sheath may include
a plurality of lands and openings that define a rack to engage with
a pinion of the drive unit.
[0022] The sheath may include a selection mechanism to select
between a first configuration where the sheath may be coupled to
the stylet to move as a single unit and a second configuration
where the stylet may be uncoupled from the sheath so that the
sheath may be movable independently of the stylet.
[0023] The sheath may enclose the second port of the stylet to
define a volume bounded by a rear bulkhead of the tip, the inner
surface of the tip and the bulkhead. The stylet tip may include a
marker disposed in the tip, the marker being ejected from the tip
in an operative condition of the device. The stylet tip may include
a marker mounted on the outer surface of the tip, the marker being
separated from the tip in an operative condition of the device. The
marker can be one or more of a hooked marker, helical marker and
serrated edge marker. The marker can be an annular marker or a
split-ring marker.
[0024] A preferred embodiment is also a method of sampling
biological tissue with a biopsy device having three elongated
members that translate along a longitudinal axis between a distal
end and a proximal end. The method can be achieved by: capturing a
biological sample in a chamber defined by two of the elongated
members; translating the two elongated members as a single unit
through the interior of a third elongated member to deliver the
biological sample from the distal end to the proximal end.
[0025] A preferred embodiment is also a method of transporting a
tissue-containing chamber with a biopsy device having four
elongated members that extends along a longitudinal axis between a
distal end and a proximal end, the method can be achieved by:
exposing a first aperture of a first sheath and a second aperture
of a second sheath, the second sheath having a chamber defined by a
first bulkhead, a second bulkhead and a floor portion of the second
sheath; providing a vacuum proximate the second aperture; enclosing
the second aperture of the second sheath with a third sheath; and
translating the chamber defined by the second and third sheaths
through a substantial portion of a fourth sheath to expose the
chamber in a third aperture formed through the fourth sheath.
[0026] A preferred embodiment also provides a single-insertion
multiple sample biopsy device, in which an outer cannula extends
along a longitudinal axis from a proximal end to a distal end. The
outer cannula has a cutting distal end and a side port arranged
proximal to the distal end. A trochar tip is supported by twin
longitudinal members that remains stationary relative to the outer
cannula and the two internal retracting longitudinal members. There
is a first sheath within the outer cannula, with a distal beveled
end. The sheath is configured to translate along a longitudinal
axis between the distal and proximal ends. There is a second sheath
within the outer cannula configured to translate along a
longitudinal axis between the distal and proximal ends. The sheath
has distal and proximal bulkheads that form a tissue accepting
port. The proximal bulkhead also forms a fluid passage in
communication with the proximal end. A drive unit translates and
revolves the outer cannula relative to the three inner members.
Another drive unit translates the first and second sheaths relative
to the trocar tip assembly and outer cannula where the two sheaths
can transpose relative to each other in a timed relationship.
[0027] A preferred embodiment also provides a single-insertion,
biopsy device that includes a cannula that has a proximal end, a
distal end, an extraction port at the distal end and a recovery
position at the proximal end. First and second elongate elements
have distal ends that are movable between the extraction port of
the cannula and the recovery position of the cannula. The first and
second elongate elements are also movable with respect to each
other to define extraction and closed configurations. In the open
configuration, the first and second elongate element distal ends
define a recess with an access. The access faces the extraction
port. In the closed configuration, the first and second elongate
element distal ends are mutually opposite to surround a volume. A
drive unit coupled to the first and second elongate elements
configures them between the open configuration and the closed
configurations and transfers the first and second elongate element
distal ends from the extraction port to the recovery position.
[0028] The drive unit may transfer the first and second elongate
element distal ends to the recovery position while the first and
second elongate elements are in the closed configuration. The
cannula may have a recovery port at the recovery position and the
drive unit configures the first and second elongate elements into
the open configuration after transferring their distal ends to the
recovery position such that the volume may be open to the recovery
port.
[0029] According to an embodiment, the invention is a
single-insertion, multiple sampling biopsy device having a sheath
extending along a longitudinal axis from a proximal end to a distal
end. The sheath has a sample recess space within it. The sheath is
selectively configurable to open and close the sample recess space.
The sheath has a movable bulkhead within it which is located at a
distal end of the sample recess. The sheath has a sample recovery
port located proximal of the sample acquisition port. A drive unit
is provided which couples to the first bulkhead to move it from the
distal end of the sheath to the sample recovery port to transport
the sample received in the sample recess to the sample recovery
port. According to this embodiment, the transport system transports
multiple samples in this manner under user control without removing
the sheath from the host.
[0030] Preferably, a second bulkhead is located on a side of the
sample recess opposite the first bulkhead. The second bulkhead
preferably has a port connected to a source of vacuum and/or
pressurized fluid. Preferably, the second bulkhead is connected to
the drive unit to move with the first bulkhead. Preferably, also,
the sheath contains first and second elements that move
independently in distal and proximal directions relative to the
sheath. Here, the directions are collinear with an axis of the
sheath, and the first and second elements form respective parts of
a cylindrical conduit connected at a proximal end to a vacuum
source and connected at a distal end to the sample recess.
[0031] Preferably, the sheath is directly adjacent the first and
second independently movable elements where the sheath holds the
first and second independently movable elements in alignment. In an
embodiment, the first and second independently movable elements are
hemicylinders.
[0032] Also, preferably, there is a selective engagement device and
the sheath contains first and second elements that move
independently in distal and proximal directions, where the
directions are collinear with an axis of the sheath. In this
embodiment, the selective engagement device interconnects the first
and second elements, the drive unit being connected to move one of
the first and second elements and to move the other of the first
and second elements selectively depending on whether the engagement
device is engaged to interconnect the first and second
elements.
[0033] In an embodiment, the first bulkhead is connected to one of
the first and second elements. In another embodiment, the sheath
has a selection mechanism to select between a first configuration
where the sheath is coupled to the stylet to move as a single unit
and a second configuration where the stylet is uncoupled from the
sheath so that the sheath is movable independently of the
stylet.
[0034] In all the above embodiments, a cutting tip extends distally
of a distal terminus of the sheath where the cutting tip is
connected to one of the first and second elements.
[0035] In another variation of the base embodiment, a selective
engagement device is provided. The sheath contains first, second,
and third elements, the first and second of which move
independently in distal and proximal directions. The directions are
collinear with an axis of the sheath and the third element is
parallel and substantially coextensive with the first and second
elements along an axis of the sheath. In this case, the third
element has a cutting tip extending distally of a distal terminus
of the sheath.
[0036] Preferably, the tip includes a marker mounted on the outer
surface of the tip, the marker being separated from the tip in an
operative condition of the device. The marker is preferably one or
more of a hooked marker, helical marker and serrated edge
marker.
[0037] According to an embodiment, the invention is a method of
sampling biological tissue with a biopsy device having first and
second elongate members that translate within a third elongate
along a longitudinal axis between a distal end and a proximal end,
the method can be achieved by: capturing a biological sample in a
chamber defined between the first and second elongated members,
translating the first and second elongate members. According to
another embodiment, the invention is a single unit through the
interior of the third elongate member to deliver the biological
sample from the distal end of the third elongate member to the
proximal end of the third elongate member. Preferably, the method
includes translating the first and second elongated members through
the third elongated member in a reverse direction to repeat the
capture and translation of another sample. Also preferably, the
method includes cutting the sample from a host by translating the
third elongate member relative to the first and second elongate
members, the third elongate member having a cutting edge at a
distal end thereof that effects the cutting.
[0038] According to an embodiment, the invention is a method of
transporting a tissue-containing chamber with a biopsy device
having four elongated members that extends along a longitudinal
axis between a distal end and a proximal end, the method can be
achieved by: exposing a first aperture of a first sheath and a
second aperture of a second sheath, the second sheath having a
chamber defined by a first bulkhead, a second bulkhead and a floor
portion of the second sheath, providing a vacuum proximate the
second aperture, enclosing the second aperture of the second sheath
with a third sheath, and translating the chamber defined by the
second and third sheaths through a substantial portion of a fourth
sheath to expose the chamber in a third aperture formed through the
fourth sheath.
[0039] According to another embodiment, the invention is a
single-insertion, multiple sampling biopsy device with an outer
cannula extending along a longitudinal axis from a proximal end to
a distal end, the outer cannula having a cutting distal end and a
side port arranged proximal of the distal end. A cutting tip
supported by twin longitudinal members remains stationary relative
to the outer cannula, and the two internal retracting longitudinal
members. A first sheath within the outer cannula, with a distal
beveled end, translates in the distal and proximal directions. A
second sheath within the outer cannula is configured to translate
along a longitudinal axis between the distal and proximal ends. The
sheath has distal and proximal bulkheads that form a tissue
accepting recess, the proximal bulkhead also forming a fluid
passage in communication with the proximal end. A drive unit
translates and revolve the outer cannula relative to the three
inner members. The drive unit translates the first and second
sheaths relative to the cutting tip and outer cannula where the two
sheaths can translate relative to each other in a predetermined
relationship.
[0040] According to another embodiment, the invention is a
single-insertion, biopsy device with a cannula that has a proximal
end, a distal end, an extraction position at the distal end and a
recovery opening at the proximal end. There are first and second
elongate elements with distal ends that are movable between the
extraction position of the cannula and the recovery opening of the
cannula. The first and second elongate elements are also movable
with respect to each other to define extraction and closed
configurations. In the extraction configuration, the first and
second elongate element distal ends define a recess at the
extraction position. This recess has an access. In the closed
configuration, the first and second elongate element distal ends
are mutually opposite to surround a volume. A drive unit coupled to
the first and second elongate elements configures them between the
open configuration and the closed configuration. The drive unit
also transfers the first and second elongate element distal ends
from the extraction position to the recovery opening. Preferably,
the drive unit transfers the first and second elongate element
distal ends to the recovery opening after placing the first and
second elongate elements in the closed configuration. Also,
preferably, the drive unit configures the first and second elongate
elements into the open configuration after transferring their
distal ends to the recovery opening. The cannula preferably has a
cutting edge at its distal end and the drive unit moves the cannula
to place the cutting edge over the recess at the extraction
position.
[0041] In another embodiment, the invention is a method of taking a
biopsy tissue sample including receiving a sample in a stylet, held
within a cutting cannula, while the stylet and cutting cannula are
inserted in a host, and moving the stylet, relative to the cutting
cannula, repeatedly from a sample receiving position to a sample
recovery position, while maintaining the cutting cannula in place
within the host. Preferably, the stylet has a cutting tip affixed
thereto such that the cutting tip is moved with the stylet. Also,
preferably, the receiving operation includes receiving the sample
adjacent a bulkhead affixed to the stylet so that the bulkhead
pushes the sample as the stylet is moved.
[0042] In a variation of the embodiment, the method includes
applying a vacuum to the stylet where the sample is received and
cutting the sample free of the host. Preferably, the method also
includes extending a cover over the sample before moving the stylet
relative to the cutting cannula. The extending can include axially
moving an elongate member relative to the stylet and the cutting
cannula, the elongate member forming a portion of a cylinder with a
major portion of the stylet, the cylinder being coaxially arranged
within the cutting cannula. In another variation, the method
includes deploying a tissue marker from a tip of the stylet.
[0043] According to another embodiment, the invention is a method
of taking a biopsy tissue sample. The method includes receiving a
sample in a stylet, held within a cutting cannula, while the stylet
and cutting cannula are inserted in a host; and extending a cover
over the sample and moving the stylet relative to the cutting
cannula from a sample receiving position to a sample recovery
position, while maintaining the cutting cannula in place within the
host.
[0044] Preferably, the receiving and extending operations are done
repeatedly to recover multiple samples. The stylet preferably has a
cutting tip affixed thereto such that the cutting tip is moved with
the stylet. Preferably the receiving operation includes receiving
the sample adjacent a bulkhead affixed to the stylet, the bulkhead
pushing the sample as the stylet is moved. Preferably, a vacuum is
applied to the stylet where the sample is received and cutting the
sample free of the host. The extending preferably includes axially
moving an elongate member relative to the stylet and the cutting
cannula, the elongate member forming a portion of a cylinder with a
major portion of the stylet, the cylinder being coaxially arranged
within the cutting cannula. In a refined embodiment, the method
includes deploying a tissue marker from a tip of the stylet.
[0045] According to another embodiment, the invention is a biopsy
device, with a stylet that has a sample recess at a distal end and
a cannula with sample acquisition port and a sample recovery port.
The stylet is movable within the cannula to move its sample recess
from the sample acquisition port to the sample recovery port. A
cover member is movable relative to the stylet to cover the sample
recess selectively. A transport mechanism is connected to move the
stylet and cover. The transport mechanism covers the sample recess
when a sample is received thereat and moving the sample recess such
that a sample in the sample recess is prevented from rubbing
against the cannula. The transport mechanism moves the cover to
uncover the sample recess to recover the sample when the sample is
moved to the recovery port.
[0046] Preferably, the sample recess is only partially uncovered at
the recovery port while the transport mechanism conveys fluid under
pressure to the sample recess to eject the sample. Also preferably,
the stylet has a cutting tip affixed thereto such that the cutting
tip is moved with the stylet. The transport mechanism preferably
creates a vacuum in the stylet sample recess to urge tissue into it
and moves the cannula relative to the sample recess to cut a
sample.
[0047] According to another embodiment, the invention is a method
of taking a biopsy tissue sample. The method includes covering a
sample with a cover member in a sample recess while moving the
recess within a cannula, to prevent the sample from frictionally
engaging the cannula and partially uncovering the sample recess at
a sample recovery position while injecting fluid under pressure to
remove the sample from the sample recess.
[0048] In all of the above devices, a vacuum source and a power
source may be provided in a self-contained hand-held biopsy device.
In all of the methods, a biopsy unit may contain a controller
programmed to execute the methods automatically or contingent on
consecutive command being entered through the biopsy device.
BRIEF DESCRIPTION OF THE DRAWINGS
[0049] The accompanying drawings, which are incorporated herein and
constitute part of this specification, illustrate presently
preferred exemplary embodiments of the invention, and, together
with the general description given above and the detailed
description given below, serve to explain features of the
invention.
[0050] FIG. 1 illustrates a perspective view of a biopsy cutter and
transport subassembly according to one exemplary embodiment of the
present invention.
[0051] FIGS. 2A-2G illustrate an exemplary embodiment of ancillary
components for the biopsy cutter and transport assembly of FIG.
1.
[0052] FIGS. 3A-3H and 3J-3M illustrate a sequence of biopsy tissue
extraction of the device of FIG. 2A.
[0053] FIGS. 4A-4H illustrate a sequence of biopsy tissue
extraction using a variation of the device of FIG. 2A.
[0054] FIGS. 5A-5H, 5J and 5K illustrate a sequence of biopsy
tissue extraction using yet another variation of the device of FIG.
1.
[0055] FIGS. 6A-6G illustrate an integrated biopsy marking system
for each of the devices of FIGS. 1-5.
[0056] FIGS. 7A-7D illustrate another integrated biopsy marking
system for the devices of FIGS. 1-5.
[0057] FIGS. 8A1, 8A2, 8A3, 8B, and 8C illustrate a further
integrated biopsy marking system for each of the devices of FIGS.
1-5.
[0058] FIGS. 9A and 9B illustrate yet another integrated biopsy
marking system for each of the devices of FIGS. 1-5.
[0059] FIGS. 10 and 11 illustrate components of a drive mechanism
for a biopsy needle having a disposable part and a durable part
which mate to create an operable device.
[0060] FIGS. 12A and 12B illustrate an alternative embodiment of a
cutting cannula, stylet and sheath.
[0061] FIG. 13 illustrates a controller.
DETAILED DESCRIPTION OF THE PREFERRED EXEMPLARY EMBODIMENTS
[0062] FIGS. 1-12B illustrate the preferred exemplary embodiments
which utilize the same reference numeral to indicate generally
similar components. In particular, FIG. 1 is a perspective view of
a single-insertion, multiple samples biopsy device 100 provided
with a transport subassembly 200 and a biopsy needle 101. Visible
in FIG. 1 is a cylindrical outer cutting cannula 20 that has a
proximal sample recovery port 20A which provides access to a
channel 10B defined between a sheath 12 and a stylet 10. Cutting
cannula 20 has a distal sample acquisition port 20B (see FIGS. 3A
and 3D). The sheath 12 and the stylet 10 are shaped like
half-cylinders arranged in mirror-image fashion to surround the
channel 10B. The sheath 12 and the stylet 10 are surrounded, and
held in place, by the cutting cannula 20.
[0063] Referring now also to FIGS. 2A through 4H, the transport
subassembly 200 drives the stylet 10 and the sheath 12. The stylet
10 carries a stylet tip 11, which is preferably shaped for
insertion into a host, for example, a trocar. There is a first
bulkhead 11A at the rear end of the stylet tip 11. A second
bulkhead 14A or 14B, which may be a cylindrical element with a hole
(14A) or a D-shaped element (14B) acts as a mechanical barrier, but
allows fluid to pass through it. The first bulkhead 11A and second
bulkhead 14A or 14B together define a sample acquisition recess 10A
between them. The cutting cannula 20 extends over a substantial
length of the stylet 10, covering the sample acquisition recess 10A
when fully extended toward the distal end of the stylet 10.
[0064] Ancillary components of the device 100 such as respective
saline and vacuum reservoirs, motor drive, reduction gears,
switches and sensors (not shown) can be coupled to the sample
recess 10A through the transport subassembly 200. The sheath 12 can
be provided with a fluid conduit 110 (shown in FIGS. 3G to 3L) to
convey air through a pressurized or negative pressure (i.e.,
vacuum) source. In addition, or in the alternative, the second
bulkhead 14A or 14B can be in fluid communication with a
bio-compatible fluid such as, for example, saline. A passage 14C
(shown in FIG. 4E and corresponding to the second bulkhead 14A
embodiment of FIG. 4A) or 14D (shown in FIG. 3A and corresponding
to the second bulkhead embodiment 14B of FIGS. 4A through 4H) opens
to the sample acquisition recess 10A and allows a fluid, such as
air or saline, to pass through the passage 14C or 14D into the
sample acquisition recess 10A or 14C or 14D. Alternatively air or
fluid can be pumped out of the sample acquisition recess 10A
through the passage 14C or 14D. Additional passages can be provided
in the second bulkhead with respective conduits, similar to conduit
110, provided to connect them to a fluid conveyance mechanism.
[0065] Focusing for now on FIGS. 3G TO 3L, the conduit 110 may be a
flexible polymer tube, such as of polyvinyl chloride (PVC) commonly
used in medical equipment. In the embodiment, the conduit 110
terminates in a boss 99 that fits snugly in the channel 10B and is
attached to the stylet 10. In an embodiment in which the sheath 12
has a rack portion 12B with openings cutting through the sheath,
the boss 99 is preferably located distally of that rack portion 12B
so that the channel 10B, defined by the sheath 12 and stylet 10, is
substantially sealed between the boss 99 and the bulkhead 14A. The
bulkhead 14A is similarly attached to the stylet. Suction applied
to the conduit 110 draws air from the channel 10B out through the
opening 14D and out from the sample acquisition recess 10A. Air or
other fluids can be conveyed in the opposite direction, under
pressure, through the conduit 110 and into the sample acquisition
recess 10A.
[0066] In alternative embodiments, the bulkhead 14A can be replaced
in this embodiment by the D-shaped bulkhead 14B. The bulkhead 14A
and the boss 99 can also be replaced by an extension of the conduit
110 that runs right up to the sample acquisition recess 10A forming
a bulkhead with its distal end. The boss 99 can be located
proximally of a rack portion 12C without permitting a leak if the
rack portion 12C is formed by a closed toothed pattern on the
sheath 12 as illustrated in FIG. 3M.
[0067] In the transport subassembly 200, the rack portion 12B, 12C,
both of which are indicated generically by reference numeral 18,
engages a pinion 16 proximate the sample recovery port 20A.
Referring to FIGS. 2A through 2E, the use of the pinion 16 and rack
18 with the latching mechanism 21 allows both the sheath element 12
and the stylet 10 to be moved simultaneously when the latching
mechanism 21 is engaged. When the latching mechanism 21 is
disengaged, the sheath element 12 moves relative to the stylet 10
as the pinion 16 rotates. As shown in FIGS. 2A to 2E, the sheath
element 12 has a hinge 12C with at least one pivoting member 22
with a distally-located shoulder 12A and a proximally-located tab
12B. The pivoting member 22 is moved into an engaged position (up)
to connect the stylet 10 to the sheath element 12 and into a
disengaged position (down) to disconnect the stylet 10, thereby
allowing the sheath element to move relative to the stylet.
[0068] Referring to FIGS. 2A and 2B, the cutting cannula 20 can be
retracted (FIG. 2A) and advanced (FIG. 2B) by a suitable mechanism
such as, for example, the worm drive assembly described in U.S.
Patent Application Publication No. 2005/0165328 published on Jul.
28, 2005, which is incorporated by reference in its entirety herein
to this application.
[0069] Referring to FIGS. 2C through 2G, the pivoting member 22 can
be moved into engaged and disengaged positions by any suitable
actuator, for example a solenoid actuator 67 connected to a glide
66 both of which are attached to a housing. When the glide 66 is in
an engagement position, it pushes the pivoting member 22 into the
engaged position and holds it while permitting the pivoting member
22 to move with the sheath element 12 by allowing the pivoting
member 22 to slide on it. Preferably, the glide 66 has a low
friction surface, such as Nylon.
[0070] Referring to FIGS. 3G to 3L, the outer cutting cannula 20 is
shown in an extended position for insertion into a host from which
a sample is to be obtained. The sheath element 12 is also in the
extended position covering the sample acquisition recess 10A. A
vacuum is applied through the conduit 110 causing a vacuum to be
generated in the sample acquisition recess 10A. The cutting cannula
20 and the sheath element 12 are then retracted as shown in FIG.
3H. For this operation, the sheath element 12 is disconnected from
the stylet 10 by disengaging the latch mechanism 22 so that the
stylet can remain in place as the sheath element 12 is retracted.
The sheath element 12 may be retracted before the cutting cannula
20, or simultaneously with the cutting cannula 20. When the sample
acquisition recess 10A is exposed to the host 103, the vacuum
causes tissue from the host 103 to be drawn into the sample
acquisition recess 10A. External pressure may also be applied at
this point, for example manually by the user. The cutting cannula
20 is then extended as shown in FIG. 3J, severing a tissue sample
BSM from the host 103. Next, as shown in FIG. 3K, the sheath
element 12 is advanced so that its distal end covers the sample
acquisition recess 10A. The latch mechanism 21 is then engaged
locking the sheath element 12 to the stylet 10 so that when the
sheath element is again retracted, as shown in FIG. 3L, the stylet
10 is also retracted. The cutting cannula 20 stays in position
relative to the host 103.
[0071] Note that the extension of the sheath element 12 so that its
distal end covers the sample acquisition recess 10A is a beneficial
feature of the embodiments here and elsewhere in the present
disclosure. By covering the sample acquisition recess 10A, the
sample is prevented from frictionally engaging the cutting cannula
as the stylet and cover are moved proximally. This helps to ensure
sample integrity. Also, the sheath element helps to reduce the
outlet area for ejection of the sample as discussed elsewhere.
[0072] FIGS. 3A to 3F show the biopsy needle operations just
described in a perspective view. In FIG. 3A, the cutting cannula 20
is retracted, exposing the sample acquisition recess 10A within the
stylet 10. The sample acquisition recess 10A has an internal volume
defined by the second bulkhead 14A, the first bulkhead 11A, and the
inside surface of the stylet 10 and cutting cannula 20 (when
closed). The vacuum is caused by sucking air through the passages
14D (or 14C in the alternative embodiment) causing the biological
tissue sample BSM to be deposited in the sample acquisition recess
10A, shown here in FIG. 3B.
[0073] For a 14 gauge stylet or needle, the internal volume is
sufficient to capture a mass of at least 50 milligrams of
biological tissues, e.g., turkey breast tissues used in testing.
For a 10 gauge stylet 10, the internal volume is sufficient to
capture a mass of at least 150 milligrams or more of biological
tissues, e.g., turkey breast tissues. The length of the stylet 10
can be of any suitable lengths, such as, for example, about 250 to
about 300 millimeters. The volume V of the housing containing all
of the components of the device 100 is preferably 500 cubic
centimeters or less and preferably about 320 cubic centimeters with
particularly preferable dimensions of about 40 millimeters by about
40 millimeters and about 200 millimeters. As used herein, the term
"about" or "approximately" for any numerical values indicates a
suitable dimensional tolerance that allows the part or collection
of components to function for its intended purpose as a biopsy
cutter, biopsy system or the combination of both the system and
cutter.
[0074] Once the cutting cannula 20 extends proximate the rear
bulkhead 11A of the stylet tip 11 to sever the biological tissue
BSM, as shown in FIG. 3B, the sheath element 12 can be extended
distally to completely surround the tissue sample (FIG. 3C). The
cutting action by the cutting cannula 20 can be by translation,
rotation, translation and rotation or a combination of these
movements along with back and forth axial movements of the cutting
cannula 20 as part of the cutting strategy. FIG. 3E shows the
cutting cannula 20 in its preferred stationary position with the
stylet 10, stylet tip 11, and the sheath element 12 retracted. The
sample acquisition recess 10A is retracted until it is aligned with
the sample recovery port 20A where bio-compatible liquid 26, fluid
28, or air can be used to expel the sample BSM from the sample
recovery port 20A, shown here in FIG. 3F, into a receptacle (not
shown). The device 100 is then ready to move towards the initial
position in FIG. 3A to take another sample.
[0075] An alternative device to obtain a tissue sample or multiple
tissue samples can be seen with reference to FIGS. 4A-4H. In this
embodiment, the second bulkhead 14B is not provided with a hollow
fluid passage 14D. Instead, the second bulkhead 14B is formed with
a D-shaped cross-section so that a fluid passage 14C can be formed
between the inner surface of the stylet 10 and the longitudinal
outer surface of the second bulkhead 14B. While it is preferable
that the second bulkhead 14B is fixed in relation to the stylet 10,
the second bulkhead 14B can be configured to move for other
purposes, such as, for example, adjusting the sampling volume. As
shown in FIG. 4A, vacuum can be provided via passage 14C to draw
the biological tissue into the sample acquisition recess 10A. The
cutting cannula 20 can be translated or both translated and rotated
to sever the tissue sample BSM from the main mass of biological
tissue M (FIG. 4B). The sheath 12 can be extended via the rack and
pinion mechanism to enclose the biological tissue BSM for transport
towards the sample recovery port 20A (FIG. 4C) while maintaining
the outer cannula generally at a fixed location (FIG. 4D). It
should be noted that a volume to contain the sample is defined by
the bulkhead 11A of the tip, the inner surface 11B of the stylet
tip 11, the inner surface of the sheath 12 and the second bulkhead
14B.
[0076] Referring to FIGS. 5A-5K, in another alternative embodiment,
the stylet tip 11 of an alternate stylet 13 is stationary while the
sheath 12 with a distal beveled end 12D and stylet 10 are
translated along at least one stylet rail 13A. This embodiment
serves to reduce the possibility of biological tissue being drawn
into the interior of the cutting cannula 20 as would be the
tendency in the embodiment of FIG. 3D as the stylet 10 is retracted
proximally. In this embodiment, the second bulkhead 15 is provided
with first port 15A and the cutting cannula 20 is provided, as in
the previous embodiments, with the sample recovery port 20A. The
stylet tip 11 is attached to a stylet rail 13A which remains fixed
relative to a drive system (not shown here), while the cutting
cannula 20, sheath element 12, and stylet 13 move relative to it.
The drive system may be similar to transport subassembly 200
described above. The stylet 13, the cutting cannula 20, and the
sheath element 12 move as in the previous embodiment, but the
stylet rail 13A remains fixed to keep the stylet tip 11 in a fixed
location relative to the host.
[0077] The sampling sequence is as follows. In FIG. 5A, the cutting
cannula 20 is translated or rotated or a combination of both
proximally to expose the port 15A of the stylet 10 and bulkhead 15.
Vacuum can be provided through passage 15B to draw the tissue
sample into the port 15A. To separate a tissue sample from the
host, the outer cannula is moved distally as shown in FIG. 5B.
Thereafter, the sheath 12 is advanced over the port 15A to enclose
the sample and the sample transported along stylet rails 13A
towards the sample recovery port 20A, shown here in FIGS. 5C, 5D,
and 5E. The sequence of tissue sampling is also shown in a side
view in FIG. 5F for clarity. In the preferred embodiments, there
are two rails but three, four or more rails can be used as needed
for structural rigidity. FIG. 5K shows the section A-A indicated in
FIG. 5A for clarification of the relationship between the elements
discussed above.
[0078] The examples shown in the illustrations and described in
detail above can be integrated with one or more of four exemplary
marking systems. In particular, each of four marking systems can be
integrated with each of the examples described above to provide for
at least eight different integrated biopsy cutter and marking
systems. For clarity, only the four marking systems will be
described and shown below. However, it should be clear that each
marking system can be combined with another of the biopsy cutter
systems as appropriate to arrive at a suitable combination of
biopsy sampling device and integrated marker.
[0079] In the foregoing embodiments, the sheath element 12 and
stylet 10, 13, and stylet rail 13A can be made of materials and
thicknesses with insufficient strength to be entirely
self-supporting. This is because the cutting cannula 20 closely
surrounds and helps to support these elements. So the cutting
cannula 20 can help to support these elements. Also, these elements
also act together, held in close alignment by the cutting cannula
20 so that they can better resist any tendency to be twisted by the
cutting cannula 20 as it rotates.
[0080] Referring to FIGS. 6A-6G, a marking system utilizing a hook
type marker 40 (i.e., a "harpoon") to prevent migration of the
marker 40 once it has been deployed, is shown. The hook type marker
40 with hook 42 or 44 can be deployed in sequence or simultaneously
with the sampling of biopsy tissues with the various technologies
described in relation to FIGS. 1-5 above. As shown in FIGS. 6A and
6E, a member (e.g., an internal D-Rod 14A, 14B, or the cutting
cannula 20) can be used to eject a marker 40 stored in the stylet
tip 11. In the exemplary embodiment of FIGS. 6A-6G, a second
bulkhead 14B is provided with a cut-out portion 14B1 having a ramp
14B2 formed on a distal end of the rod 14B. The ramp 14B2 can be
used (depending on whether the cutting cannula 20 or rod 14B is
axially translated only, rotated only or a combination of axial
translation and rotation) to ensure that the marker 40 is deposited
sufficiently near the tissue sampling site. Various marker
configurations can be utilized. For example, as shown in FIG. 6D, a
marker with wire like hooks 40, square sectioned hook 40B, or
marker with serrated edges 40C can be used in this system.
[0081] Referring FIGS. 7A-7D, a marking system utilizing a split
ring marker 50 can be utilized with various biopsy techniques
described above in relation to FIGS. 1-5. In FIGS. 7A and 7B, the
split-ring marker 50 can be mounted to the stylet 10 via a suitable
technique such as, for example, crimping, swaging or semi-permanent
bonding. Optionally, an intermediate member 38 that forms a seal
with the cannula or cutting cannula 20 can be provided to maintain
a generally constant outer diameter of the cutting cannula 20
without an abrupt transition to the stylet tip 11. Referring to
FIGS. 7C and 7D, the split-ring marker 50 can be deployed by
itself, simultaneously with the sampling of the tissue, prior to
sampling or subsequent to the sampling. As shown in FIGS. 7C and
7D, the stylet tip 11 can be actuated proximally towards the user
to force the split-ring marker 50 to detach from the stylet tip 11.
Alternatively, the cutting cannula 20 can be actuated distally away
from the user to force the split-ring marker 50 to separate from
the stylet tip 11.
[0082] Referring to FIGS. 8A1, 8A2, 8A3, 8B, and 8C, a marking
system using a blossom-type marker 60 can be utilized with various
biopsy techniques described above in relation to FIGS. 1 and 2. As
shown in FIGS. 8A1-8A3, in perspective, and in 8B and 8C in
section, the blossom marker 60 is mounted on a specially configured
stylet tip 111 (FIG. 6C), which has grooves 112 and ramps 114
disposed about a longitudinal axis of the stylet tip 111. The
blossom marker 60 can be mounted by a suitable technique, such as,
for example, crimping, swaging, or casting onto the specially
configured stylet tip 111. The cutting cannula 20 can be moved
distally away from the user to force the blossom marker 60 to be
separated from the stylet tip 110. As the marker 60 is separated
from the stylet tip 111, the ramps 114 on the stylet tip 111 force
the sectioned tips 62A-62E to blossom, thereby forming hooks
64A-64E. Alternatively, the stylet tip 111 can be moved proximally
towards the user so that the marker is deployed by pushing against
the cutting cannula 20.
[0083] Referring to FIGS. 9A and 9B, another marking system is
shown which uses a spiral-type marker 70 in conjunction with
various biopsy systems described above in relation to FIGS. 1-5. As
shown in FIG. 9A, a coiled marker wire 70 can be disposed in an
interior hollow section 113 of the stylet tip 11. A suitable
deployment mechanism can be used to eject the coiled marker wire
out of its storage space in the stylet tip 11. The deployment
mechanism can be a suitable mechanism, such as, for example, a
linear-to-rotary motion converter that converts a linear motion
into a rotary motion to rotatably expel the marker. For example,
the shuttle 14A can have a notch at its distal end that engages
with the marker wire 70 and rotates it.
[0084] The materials suitable for use as part of each marker can
be, for example, stainless steel, gold, titanium, platinum,
tantalum, barium sulfate, biodegradable iron or shape memory
polymer or metal alloy such as Nitinol. It is noted that Nitinol is
radio-opaque, ultrasonically opaque and MRI compatible and
therefore would be preferred by itself or in combination with other
materials described herein and as known to those skilled in the
art. Further, the markers can be of any suitable size so that it
can be fitted onto a 7, 8, 9, 10, 11, 12, 14, or 16 gauge
needle.
[0085] Although the markers have been shown as a single deployment
marker, some of the embodiments disclosed herein can be utilized in
a multiple deployment aspect. For example, the stylet tip 11 can be
configured to store a plurality of harpoon markers 40; the stylet
10 can be mounted with a longitudinal series of split-ring markers
50; the stylet tip 11 can be configured with a cutter so that
multiple helical markers 70 can be deployed.
[0086] FIGS. 10 and 11 show an alternative embodiment of a drive
system for driving the cutting cannula 20, the sheath 12 and the
stylet 10 of the above embodiments as well as other embodiments.
The assembly 201 and 251 consists of a disposable component 201
carrying a cutting cannula 20, a stylet 10 within the cutting
cannula 20, which carries a trocar tip 211. The stylet 10 has a
port 210A. The assembly 201 and 251 is illustrated such that only
the drive components are shown, and a durable component 251.
Although not shown in the figure, the disposable component 201 may
include components such as a sample chamber, fluid circuits for
conveying saline and a vacuum, and other elements which may be
identified with the above descriptions of embodiments of biopsy
devices and their operation.
[0087] According to one embodiment, a cutter extension 220 forms an
axial extension to the cutting cannula 20 and surrounds an upper
half-pipe 242 and a lower half-pipe 224. The upper half-pipe is an
axial extension of sheath 12 and the lower half-pipe is an axial
extension of the stylet 10. The three: cutter extension 220, lower
half-pipe 224 and upper half-pipe 424 are independently movable, in
an axial direction, with respect to each other. In this and other
embodiments, the half-pipes can be replaced with other partial
cylindrical or prism sections capable of providing mating sections.
For example, a 3/4 pipe could be made with a 1/4 pipe. In addition,
the longitudinal members could overlap such that the mating pairs
define a complete (circular) section but the sum of the
circumferential extent of their cross-sections can be greater than
a full circle.
[0088] The upper half-pipe 224 and the lower half-pipe 242 are
driven by respective lead screws 206 and 208, which rotate in the
chassis 218; the lead screw 206 driving the upper half-pipe 224 and
the lead screw 208 driving the lower half-pipe 242. The lead screws
206 and 208 thread into traveling carriages 210 and 212,
respectively.
[0089] The carriage 210 engages a journal 228 affixed to the end of
upper half-pipe 224 so that when the lead screw 206 turns, the
carriage 210 moves axially causing the upper half-pipe 224 to move
axially with it. Similarly, the carriage 212 engages a journal 226
affixed to the end of lower half-pipe 242 so that when the lead
screw 208 turns, the carriage 212 moves axially causing the upper
half-pipe 242 to move axially with it.
[0090] The lead screw 208 has a lead screw gear 202 affixed to an
end thereof for driving the lead screw 208. Similarly, the lead
screw 206 has a lead screw gear 204 affixed to an end thereof for
driving the lead screw 206. The cutter extension 220 is driven
axially by a cutter screw 214 which is rotated by a cutter gear
215. The cutter screw 214 is threaded in a nut which is affixed to
a disposable chassis 218.
[0091] The lead screw gear 202 engages a pinion 252 in the durable
component 251. The lead screw gear 204 engages a pinion 254 in the
durable component 251. The cutter gear 215 engages a pinion 256 in
the durable component 251. Motor/transmission drives 264, 256 and
260 are connected to rotate pinions 252, 254, and 256,
respectively. The lead screw gears 202 and 204 and the cutter gear
215 engage the pinions 252, 254, and 256 when the disposable
component 201 is attached to the durable component 251 with the
durable component and the disposable chassis 218 registering the
various components.
[0092] Referring now also to FIGS. 4A to 4D, it should be clear
from the above description that when the lead screw gears 202 and
204 and the cutter gear 215 engage the pinions 252, 254, and 256,
respectively, the cutting cannula 20, the sheath 12, and the stylet
10, can be moved independently by controlling the
motor/transmission drives 260, 256 and 264, respectively.
Therefore, the above embodiment permits a sample to be taken into
the sample port 210A, in accord with the embodiment of FIGS. 4A to
4D and moved to a chamber port 244 in the cutter extension where it
can be recovered.
[0093] A controller (not shown) may be configured to control the
motor/transmission drives 260, 256 and 264 such that the following
operation sequence can be realized to obtaining a sample and
deliver it to the port 244. Note that the port 244 corresponds, in
this embodiment, to the sample recovery port 20A or sample
acquisition recess 10A of the embodiments of FIGS. 3A to 4D as
described above. The procedure may be as follows. [0094] 1. Upon
insertion of the disposable component 201, assert home position in
which the cutting cannula 20 and the stylet 10 are fully extended
toward the needle distal end and sheath 12 is retracted to the
position shown in FIG. 4A. This is done by running motor
transmission drives 260, 256 and 264 to registration positions,
where respective (limit) switches are triggered, and counting the
pulses of respective encoders. The indication of insertion may be
by means of a switch (not shown) on the durable component 251
triggered by a boss (not shown) on the chassis 218. The
registration may be followed by the retraction of the chassis 218
in preparation for a thrusting operation as is known for biopsy
needles. [0095] 2. Upon receipt of a command (e.g., a control panel
switch) to obtain a sample, a vacuum pump (not shown, but
preferably a component such as a syringe is provided in the
disposable component 201 and a mating drive is provided in the
durable component 251) is operated to obtain an initial vacuum.
[0096] 3. As soon an initial vacuum is generated, the cutting
cannula 20 is retracted by running motor/transmission drive 260
while counting pulses of an encoder to a proximal stop point.
Alternatively control signaling can be provided by a limit switch.
[0097] 4. After a programmed interval, following the retraction of
the cutting cannula 20, the cutting cannula 20 is driven distally
by operating the motor/transmission drive 260 while counting pulses
of an encoder to a proximal stop point. Alternatively control
signaling can be provided by a limit switch. [0098] 5. At the same
time as the cutting operation, the sheath 12 may be driven distally
so that it covers and protects the sample from frictional
engagement with the surrounding surfaces (e.g., the cannula 20)
when the stylet 10 and sheath 12 are moved proximally. The sheath
12 may be driven distally at a later time. The sheath 12 may be
driven by operating the motor/transmission drive 256 while counting
pulses of an encoder to a distal stop point or according to signals
of a limit switch. [0099] 6. At this point, the sample is covered
by the sheath 12 and stylet 10 may be retracted to the port 244.
This may be done by operating the motor/transmission drives 256 and
264 simultaneously while counting pulses of an encoder to a distal
stop point or according to signals of a limit switch. Preferably
the rotation of the drives is synchronized to keep the sheath 12
and stylet 10 together as they travel to the port 244. [0100] 7.
After the sample reaches the port 244, the sheath 12 may be further
retracted to uncover the sample for extraction through the port
244. The sample may be ejected as described above, for example
using a puff of air or saline or both. [0101] In the present
embodiment, the upper and lower half-pipes 242 and 224 are
equal-diameter hemi-cylindrical elements that slide within cutter
extension 220, which defines a full cylinder. However, other
arrangements are possible, such as one in which all three, upper
and lower half-pipes 242 and 224 and the cutter extension 220
define full cylinders which are arranged coaxially, or where upper
and lower half-pipes 242 and 224 are replaced by rods which are
connected to the sheath 12 and stylet 10 toward the distal end of
the stylet 10.
[0102] FIGS. 12A and 12B illustrate an alternative embodiment of a
cutting cannula 320, stylet 310 and sheath 312 which may be
implemented with a coaxial arrangement of the cutting cannula 320,
stylet 310 and sheath 312 whose functions are similar to cutting
cannula 20, stylet 10 and sheath 12 but where instead of the sheath
12 being positioned over the sample by displacing it in an axial
direction, the sheath 312 is rotated about a common axis of the
assembly. In FIG. 12A, the arrangement is shown with the sheath 312
in position for receiving or ejecting a sample or for cutting. In
FIG. 12B, the arrangement is shown with the sheath 312 in position
for transporting the sample through the cutting cannula 320.
[0103] Referring to FIG. 13, in all of the above embodiments,
various motors, drives, valves, and other actuators are variously
described along with their respective operations and operational
sequences. It is clear from the particulars of each embodiment that
a device may employ a controller 350 such as a programmable
microprocessor controller, to provide the described
functionality.
[0104] While the present invention has been disclosed with
reference to certain preferred embodiments, numerous modifications,
alterations, and changes to the described embodiments are possible
without departing from the sphere and scope of the present
invention, which is described, by way of example, in the appended
numbered paragraphs below. Accordingly, it is intended that the
present invention not be limited to the described embodiments, but
that it have the full scope defined by the language of at least the
following paragraphs, and equivalents thereof.
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