U.S. patent application number 12/025672 was filed with the patent office on 2009-10-08 for winding mandrel for vasoocclusive coils.
This patent application is currently assigned to Micrus Endovascular Corporation. Invention is credited to Marcelino Gorospe, Thu Anh Ho, Edsel San Diego.
Application Number | 20090254112 12/025672 |
Document ID | / |
Family ID | 39327127 |
Filed Date | 2009-10-08 |
United States Patent
Application |
20090254112 |
Kind Code |
A1 |
Gorospe; Marcelino ; et
al. |
October 8, 2009 |
WINDING MANDREL FOR VASOOCCLUSIVE COILS
Abstract
The winding mandrel includes a pair of generally rounded-cube
shaped or orthogonally flat-sided spherical main bodies connected
together and having a plurality of cylindrical posts for forming
vasoocclusive coils. The main bodies are connected together by a
transition post, and the posts of the two main bodies are typically
offset. A front end post and back end post are disposed on the
front and rear ends of the mandrel. A short winding post member may
be added between the connections of the two main bodies to provide
additional winding posts.
Inventors: |
Gorospe; Marcelino; (Redwood
City, CA) ; San Diego; Edsel; (San Jose, CA) ;
Ho; Thu Anh; (San Jose, CA) |
Correspondence
Address: |
FULWIDER PATTON LLP
HOWARD HUGHES CENTER, 6060 CENTER DRIVE, TENTH FLOOR
LOS ANGELES
CA
90045
US
|
Assignee: |
Micrus Endovascular
Corporation
San Jose
CA
|
Family ID: |
39327127 |
Appl. No.: |
12/025672 |
Filed: |
February 4, 2008 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
60899967 |
Feb 7, 2007 |
|
|
|
Current U.S.
Class: |
606/191 ;
140/71C; 242/470; 242/600 |
Current CPC
Class: |
A61B 2017/00867
20130101; B21C 47/00 20130101; A61B 17/12022 20130101; B21F 45/008
20130101; A61B 17/12109 20130101; A61B 2017/00526 20130101; A61B
17/12145 20130101 |
Class at
Publication: |
606/191 ;
242/600; 242/470; 140/71.C |
International
Class: |
A61M 29/00 20060101
A61M029/00; B65H 75/18 20060101 B65H075/18; B65H 54/10 20060101
B65H054/10; B65H 75/04 20060101 B65H075/04; B21F 45/00 20060101
B21F045/00 |
Claims
1. A winding mandrel for forming at least a portion of a
vasoocclusive coil, comprising: first and second main bodies, each
of said first and second main bodies having a plurality of
cylindrical posts disposed on the first and second main bodies, the
plurality of cylindrical posts disposed on the first main body
being substantially aligned with orthogonal x and y axes through
the first main body, and the plurality of cylindrical posts
disposed on the second main body being substantially aligned with
orthogonal x and y axes through the second main body; a front end
cylindrical post disposed on one of said first and second main
bodies; and a back end cylindrical post disposed on the other of
said first and second main bodies.
2. The winding mandrel of claim 1, wherein said first and second
main bodies have a plurality of flat sides, and said cylindrical
posts are attached to said flat sides, respectively.
3. The winding mandrel of claim 1, wherein said plurality of
cylindrical posts of said first and second main bodies are
angularly offset with respect to each other.
4. The winding mandrel of claim 1, wherein said cylindrical posts
have a diameter slightly smaller than a diameter of the main
bodies.
5. The winding mandrel of claim 1, wherein said one of the front
end and back end cylindrical posts is substantially elongated with
respect to the other.
6. The winding mandrel of claim 1, further comprising: a central
transition post extending between and connecting said first and
second main bodies; and at least one central cylindrical winding
post connected to and extending perpendicularly from said central
transition post.
7. A winding mandrel for forming at least a portion of a
vasoocclusive coil, comprising: first and second main bodies, each
of said first and second main bodies having a plurality of
cylindrical posts disposed on the first and second main bodies, the
plurality of cylindrical posts disposed on the first main body
being aligned with orthogonal x and y axes through the first main
body, and the plurality of cylindrical posts disposed on the second
main body being aligned with orthogonal x and y axes through the
second main body; a central transition post extending between and
connecting said first and second main bodies; a front end
cylindrical post disposed on one of said first and second main
bodies; a back end cylindrical post disposed on the other of said
first and second main bodies; and at least one central cylindrical
winding post connected to and extending perpendicularly from said
central transition post.
8. The winding mandrel of claim 7, wherein said first and second
main bodies have a plurality of flat sides, and said cylindrical
posts are attached to said flat sides, respectively.
9. The winding mandrel of claim 7, wherein said plurality of
cylindrical posts of said first and second main bodies are
angularly offset with respect to each other.
10. The winding mandrel of claim 7, wherein said cylindrical posts
have a diameter slightly smaller than a diameter of the main
bodies.
11. The winding mandrel of claim 7, wherein said one of the front
end and back end cylindrical posts is substantially elongated with
respect to the other.
12. The winding mandrel of claim 7, wherein said at least one
central cylindrical winding post comprises first and second central
cylindrical winding posts connected to and extending
perpendicularly from said central transition post.
13. A method of forming at least a portion of a vasoocclusive coil,
comprising the steps of: a) providing a winding mandrel including:
(i) first and second main bodies, each of said first and second
main bodies having a plurality of cylindrical posts disposed on the
first and second main bodies, the plurality of cylindrical posts
disposed on the first main body being aligned with orthogonal x and
y axes through the first main body, and the plurality of
cylindrical posts disposed on the second main body being aligned
with orthogonal x and y axes through the second main body; (ii) a
front end cylindrical post disposed on one of said first and second
main bodies; and (iii) a back end cylindrical post disposed on the
other of said first and second main bodies; and b) winding a coil
about at least one of said first and second main bodies, said
plurality of cylindrical posts disposed on said first and second
main bodies, said front end cylindrical post, and said back end
cylindrical post to form at least a portion of the coil in a
three-dimensional configuration.
14. The method of claim 13, wherein one of said front end and back
end cylindrical posts is substantially elongated with respect to
the other, and further comprising the step of helically winding an
elongated portion of the coil about said one of said front end and
back end cylindrical posts.
15. The method of claim 13, wherein said winding mandrel further
includes a central transition post extending between and connecting
said first and second main bodies, and at least one central
cylindrical winding post connected to and extending perpendicularly
from said central transition post, and wherein said step of winding
a coil comprises: winding the coil about at least one of said first
and second main bodies, said plurality of cylindrical posts
disposed on said first and second main bodies, said central
transition post extending between and connecting said first and
second main bodies, said front end cylindrical post, said back end
cylindrical post, and said at least one central cylindrical winding
post, to form at least a portion of the coil in a three-dimensional
configuration.
16. The method of claim 15, wherein one of said front end and back
end cylindrical posts is substantially elongated with respect to
the other, and further comprising the step of helically winding an
elongated portion of the coil about said one of said front end and
back end cylindrical posts.
17. A vasoocclusive coil, wherein at least a portion of said
vasoocclusive coil is formed in a three-dimensional configuration
according to the method of claim 13.
18. The vasoocclusive coil of claim 17, wherein one of said front
end and back end cylindrical posts is substantially elongated with
respect to the other, and wherein said vasoocclusive coil comprises
an elongated portion formed by helically winding the elongated
portion of the coil about said one of said front end and back end
cylindrical posts.
19. A vasoocclusive coil, wherein at least a portion of said
vasoocclusive coil is formed by: a) providing a winding mandrel
including: (i) first and second main bodies, each of said first and
second main bodies having a plurality of cylindrical posts disposed
on the first and second main bodies, the plurality of cylindrical
posts disposed on the first main body being aligned with orthogonal
x and y axes through the first main body, and the plurality of
cylindrical posts disposed on the second main body being aligned
with orthogonal x and y axes through the second main body; (ii) a
front end cylindrical post disposed on one of said first and second
main bodies; and (iii) a back end cylindrical post disposed on the
other of said first and second main bodies; and b) winding the
vasoocclusive coil about at least one of said first and second main
bodies, said plurality of cylindrical posts disposed on said first
and second main bodies, said front end cylindrical post, and said
back end cylindrical post to form at least a portion of the
vasoocclusive coil in a three-dimensional configuration.
20. The vasoocclusive coil of claim 19, wherein one of said front
end and back end cylindrical posts is substantially elongated with
respect to the other, and wherein said vasoocclusive coil comprises
an elongated portion formed by helically winding the elongated
portion of the coil about said one of said front end and back end
cylindrical posts.
Description
CROSS-REFERENCES TO RELATED APPLICATIONS
[0001] This application is based upon Provisional Application No.
60/899,967, filed 7 Feb. 2007.
BACKGROUND OF THE INVENTION
[0002] This invention relates generally to vasoocclusive devices,
and more particularly concerns a mandrel for forming at least a
portion of a vasoocclusive coil in a three dimensional
configuration by winding of the coil about one or more portions of
the mandrel.
[0003] Vasoocclusion devices are therapeutic devices that are
placed within the vasculature of the human body, typically via a
catheter, either to block the flow of blood through a vessel making
up that portion of the vasculature through the formation of an
embolus, or to form such an embolus within an aneurysm stemming
from the vessel. The vasoocclusive devices can take a variety of
configurations, and are generally formed of one or more elements
that are larger in the deployed configuration than when they are
within the delivery catheter prior to placement. One widely used
vasoocclusive device is a helical wire coil having a deployed
configuration which may be dimensioned to engage the walls of the
vessels. For example, the vasoocclusive device may include one or
more vasoocclusive members wound to form a generally spherical or
ovoid shape in a relaxed state. Vasoocclusive members can be wound
around an appropriately shaped mandrel or form and then
heat-treated to retain the shape after removal from the heating
form.
[0004] One type of mandrel used for winding and forming a
vasoocclusive coil around the surface of the mandrel has a
substantially spherical main body with six cylindrical posts having
a diameter slightly smaller than that of the main body, disposed on
the body and aligned with the three orthogonal x, y and z axes
through the body of the mandrel, for aligning and shaping one or
more portions of the vasoocclusive device as it is wound on the
mandrel. One of the posts is longer than the other posts, to serve
as a mandrel for helically winding a proximal portion of the
vasoocclusive coil. In one variation of the mandrel, the mandrel
has a main body that is substantially cubical, with six cylindrical
posts disposed on each of the faces of the main body, and one of
the posts being longer than the others.
[0005] Another type of mandrel has a substantially orthogonal main
body with six cylindrical posts having a diameter slightly smaller
than that of the main body, disposed on the body and aligned with
the three orthogonal x, y and z axes through the body of the
mandrel, for aligning and shaping the distal portion of the
vasoocclusive device as it is wound on the mandrel. Preferably one
of the posts is longer than the other posts, to serve as a mandrel
for helically winding the proximal portion of the vasoocclusive
coil. The mandrel may include a threaded aperture in a face of one
of the posts and coaxially aligned with the orthogonal axis the
post for receiving a corresponding end of a generally cylindrical
handle, which is correspondingly threaded, and the handle can also
be used as a mandrel for winding a portion of the vasoocclusive
coil with a helical shape.
[0006] Another type of mandrel has a substantially spherical main
body, with a plurality of circumferential grooves defined on the
surface of the main body, and this type of mandrel may additionally
have a plurality of posts mounted on the main body of the mandrel
for aligning the occlusive device as it is wound on the mandrel.
The surface of the mandrel may also have one or more apertures for
receiving one or more ends of the strands, to assist winding into
the desired form.
[0007] Heat treatment of the wound coil at a temperature of about
1100.degree. F. for approximately four hours or more is typically
sufficient to impart the form to the occlusive device when the
shape memory material is a nickel titanium super-elastic alloy.
After the heat treatment, the occlusive device is removed from the
mandrel, and cold worked into the desired collapsed elongated
configuration for placement into a catheter or cannula for use.
When the occlusive device reaches its destination in the
vasculature during vascular therapy, it assumes the primary shape
imparted from the heat treatment on the mandrel.
[0008] Such spherical, cubical or orthogonal mandrels for winding
of vasoocclusive coils have proved suitable for winding coils in
such shapes, and allow for the combination of multiple coils or the
winding of various shapes in an individual coil, but it would be
desirable to provide a winding mandrel offering a greater variety
of options for winding patterns for forming other shapes of
vasoocclusive coils, such as for forming longer framing coils, and
for providing shorter transitions between coils for coils with more
than six loops, for example. The present invention satisfies these
and other needs.
SUMMARY OF THE INVENTION
[0009] Briefly, and in general terms, the invention provides for a
winding mandrel having a pair of generally rounded-cube shaped or
orthogonally flat-sided spherical main bodies connected together,
and each having a plurality of cylindrical posts, to provide from
ten to twelve available winding posts, allowing for a greater
variety of options for winding patterns for forming other shapes of
vasoocclusive coils, as well as short transitions between portions
of coils wound on the mandrel.
[0010] The present invention accordingly provides for a winding
mandrel having a pair of generally rounded-cube shaped or
orthogonally flat-sided spherical main bodies, each having a
plurality of cylindrical posts disposed on the bodies and aligned
with orthogonal x and y axes through the bodies of the mandrel, for
aligning and shaping one or more portions of the vasoocclusive
device as it is wound on the mandrel. In a presently preferred
embodiment, the cylindrical posts are attached to flat sides of the
main bodies. In a presently preferred embodiment, the orthogonal x
and y axes through the main bodies of the mandrel are offset with
respect to each other. The cylindrical posts typically have a
diameter slightly smaller than that of the main bodies. The main
bodies are connected together by a central transition post
extending between the main bodies along a longitudinal central z
axis through the main bodies. A front end cylindrical post and a
back end cylindrical post are disposed on front and rear ends of
the main bodies extending along the longitudinal central z axis
through the main bodies, providing for a total of ten winding
posts. One of the front end and back end cylindrical posts may be
substantially elongated with respect to the other, to provide a
handle, or to serve as a post for helically winding an elongated
portion of a vasoocclusive coil.
[0011] In another embodiment, a short winding post is added between
the connections of the two main bodies for two additional winding
posts.
[0012] Other features and advantages of the present invention will
become more apparent from the following detailed description of the
preferred embodiments in conjunction with the accompanying
drawings, which illustrate, by way of example, the operation of the
invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] FIG. 1 is a rear elevational view of a first embodiment of a
winding mandrel according to the present invention.
[0014] FIG. 2 is a top plan view of the winding mandrel of FIG.
1.
[0015] FIG. 3 is a perspective view of the winding mandrel of FIG.
1.
[0016] FIG. 4 is a top plan view of a second embodiment of a
winding mandrel according to the present invention.
[0017] FIG. 5 is a rear elevational view of the winding mandrel of
FIG. 4.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0018] Referring to the drawings, which are provided for purposes
of illustration and by way of example, the present invention
provides for a winding mandrel for forming at least a portion of a
vasoocclusive coil in a three-dimensional configuration by winding
of the coil about one or more portions of the mandrel.
[0019] As is illustrated in FIGS. 1-3, in a first embodiment, the
mandrel 10 includes ten winding posts 12 (one front post 14, four
primary winding posts 16a, b, c, d, four secondary winding posts
18a, b, c, d, and one back post 20) and two generally rounded-cube
shaped or orthogonally flat-sided spherical main bodies 22, 24,
with a transition post 26 between the two main bodies. Each main
body is machined on six sides to provide flat sides 28 for
connecting to the winding posts and the other main body. The front
winding post may be smaller in diameter than the diameter of the
other posts, and is typically approximately 75% the size of the
other posts. This front winding post is connected to one of the
machined flat sides and may be generally tangent to the main body
22 as the starter for the first coil loop.
[0020] The four primary winding posts are connected to the other
four flat sides perpendicular to the front winding post. These
posts form a cross pattern perpendicular to the front winding
post.
[0021] The second main body 24 is connected at the last machined
flat spot of the first main body. Four secondary winding posts and
a back post are connected at the machine flat sides of the second
main body. The four secondary winding posts will form a similar
pattern as the primary winding posts, except that they are
preferably indexed over or offset (such as approximately 45
degrees, for example), so that the individual secondary posts line
up between the primary winding posts. The back winding post is
mounted on the end opposite to the front winding post, and in line
with the front winding post, and is longer to serve as a handle for
holding the mandrel during the winding process, or to serve as a
post for helically winding an elongated portion of a vasoocclusive
coil.
[0022] In a second embodiment, a twelve post winding mandrel is
substantially the same as the ten post winding mandrel of FIGS.
1-3, except that a short winding post is added between the
connections of the two generally rounded-cube shaped or
orthogonally flat-sided spherical main bodies for two additional
winding posts. Referring to FIGS. 4 and 5, in the second
embodiment, the mandrel 30 includes winding posts 32 (one front
post 34, four primary winding posts 36a, b, c, d, four secondary
winding posts 38a, b, c, d, and one back post 40) and two generally
rounded-cube shaped or orthogonally flat-sided spherical main
bodies 42, 44, with a transition post 46 between the two main
bodies. Each main body is machined on six sides to provide flat
sides 48 for connecting to the winding posts and the other main
body. The front winding post may be smaller in diameter than the
diameter of the other posts, and is typically approximately 75% the
size of the other posts. This front winding post is connected to
one of the machined flat sides and may be generally tangent to the
main body 42 as the starter for the first coil loop.
[0023] The four primary winding posts are connected to the other
four flat sides perpendicular to the front winding post. These
posts form a cross pattern perpendicular to the front winding
post.
[0024] The first and second main bodies are connected by the
transition post 46 between the two main bodies. Four secondary
winding posts and a back post are connected at the machine flat
sides of the second main body. The four secondary winding posts
form a similar pattern as the primary winding posts, except that
they are preferably indexed over or offset (such as approximately
45 degrees, for example), so that the individual secondary posts
line up between the primary winding posts. The back winding post is
mounted on the end opposite to the front winding post, and in line
with the front winding post, and is longer to serve as a handle for
holding the mandrel during the winding process, or to serve as a
post for helically winding an elongated portion of a vasoocclusive
coil. Two additional winding posts 50a, 50b are mounted to the
transition post 46, extending perpendicularly from the longitudinal
axis of the transition post, between the two main bodies, to
provide for a twelve post winding mandrel.
[0025] It will be apparent from the foregoing that, while
particular forms of the invention have been illustrated and
described, various modifications can be made without departing from
the spirit and scope of the invention. Accordingly, it is not
intended that the invention be limited, except as by the appended
claims.
* * * * *