Method and apparatus for retaining a fixation pin to a cannula
View Patent ↗A medical device for placement in an anatomy and for use with a guide wire that generally includes a cannula member configured to be inserted into the anatomy. The cannula member has a wall that includes an outer wall surface and an inner wall surface. The inner wall surface defines an inner passage that extends along a longitudinal axis of the medical device. A guide wire holding member is formed in the wall of the cannula member. The guide wire holding member defines a cavity in the wall of the cannula member and an aperture in the inner wall surface in communication with the cavity that can receive the guide wire from the inner passage of the cannula member.
1. A medical device for placement in an anatomy and for use with a guide wire, the medical device comprising:
a cannula member configured to be inserted into the anatomy, said cannula member having a terminal proximal end, a terminal distal end, and a wall that includes an outer wall surface and a cylindrical inner wall surface, said inner wall surface defining an inner passage that extends along a longitudinal axis of the medical device, said outer wall surface remaining circular in cross section from said terminal proximal end to said terminal distal end; and
a guide wire holding member formed in said wall of said cannula member and extending continuously from said terminal proximal end to said terminal distal end of said cannula member, said guide wire holding member defining a cavity in said wall of said cannula member between said outer wall surface and said inner wall surface and
wherein said inner wall surface comprises an aperture extending continuously from said terminal proximal end to said terminal distal end of said cannula member, said aperture in communication with said cavity that permits the guide wire to move between said inner passage and said cavity of said cannula member in a direction that is generally perpendicular to said longitudinal axis of the medical device when a longitudinal axis of the guide wire is generally parallel to said longitudinal axis of the medical device.
2. The medical device of claim 1 , wherein said cavity has a shape that is selected from a group consisting of a partially circular-shape and a partially oval-shape.
3. The medical device of claim 1 , wherein said guide wire holding member is bendable.
4. The medical device of claim 1 , wherein said guide wire holding member is steerable in response to motion of the guide wire.
5. The medical device of claim 1 , wherein said aperture permits the guide wire to move between said inner passage and said cavity of said cannula member at any location along said longitudinal axis of the medical device.
6. The medical device of claim 1 , wherein said aperture permits the guide wire to move between said inner passage and said cavity of said cannula member without moving the guide wire in a direction along said longitudinal axis of the cannula member.
7. A medical device for placement in an anatomy and for use with a guide wire, the medical device comprising:
a cannula member configured to be inserted into the anatomy, said cannula member having a terminal proximal end, a terminal distal end, and a wall that includes an outer wall surface and a cylindrical inner wall surface, said inner wall surface defining an inner passage that extends along a longitudinal axis of the medical device; and
a guide wire holding member formed in said wall of said cannula member and extending continuously from said terminal proximal end to said terminal distal end of said cannula member, said guide wire holding member defining a cavity in said wall of said cannula member between said outer wall surface and said inner wall surface,
wherein said inner wall surface comprises an aperture extending continuously from said terminal proximal end to said terminal distal end of said cannula member, said aperture in communication with said cavity that permits the guide wire to move between said inner passage and said cavity of said cannula member in a direction that is generally perpendicular to said longitudinal axis of the medical device when a longitudinal axis of the guide wire is generally parallel to said longitudinal axis of the medical device, and
wherein said cannula member is configured with threaded portions formed from said outer cylindrical wall of said cannula member.
8. The medical device of claim 7 , wherein said threaded portions are recessed in said outer cylindrical wall of said cannula member.
9. The medical device of claim 7 , wherein said threaded portions are raised relative to said outer cylindrical wall of said cannula member.
10. A medical device for placement in an anatomy and for use with one or more guide wires, the medical device comprising:
a cannula member configured to be inserted into the anatomy, said cannula member having a terminal proximal end and a terminal distal end and having a length measured from said terminal proximal end to said terminal distal end, said cannula member having a wall that includes an outer wall surface and a cylindrical inner wall surface, said inner wall surface defining an inner passage that extends along a longitudinal axis of the medical device; and
a first guide wire holding member and a second guide wire holding member formed in said wall of said cannula member between said outer wall surface and said inner wall surface, said first and second guide wire holding members each defining a respective cavity in said wall of said cannula member and a respective aperture in said inner wall surface in continuous communication with said respective cavity that permits the guide wire to move between said inner passage and said respective cavity of said cannula member, wherein each of said cavities and apertures associated with said first and second guide wire holding members and said inner passage extends continuously along the length of said cannula member from said terminal proximal end to said terminal distal end.
11. The medical device of claim 10 , wherein said first and second guide wire holding members are radially opposed to one another.
12. The medical device of claim 10 , wherein said cavity has a shape that is selected from a group consisting of a partially circular-shape and a partially oval-shape.
13. The medical device of claim 10 , wherein said apertures in said inner wall surface in continuous communication with said cavities permit the guide wire to move between said inner passage and said cavities of said cannula member in a direction that is generally perpendicular to said longitudinal axis of the medical device when a longitudinal axis of the guide is generally parallel to said longitudinal axis of the medical device.
14. A method of use for a medical device and a guide wire for placement in an anatomy, the method comprising:
providing a cannula member having a terminal proximal end, a terminal distal end, and a wall having an outer surface and a cylindrical inner surface, wherein the inner surface defines an inner passage, wherein the cannula member defines a longitudinal axis;
providing the guide wire in said inner passage, wherein the guide wire defines a longitudinal axis; and
moving the guide wire through an aperture between said inner passage and a cavity formed in said wall between said inner surface and said outer surface in a direction that is generally perpendicular to said longitudinal axis of said cannula member when said longitudinal axis of the guide wire is generally parallel to said longitudinal axis of said cannula member, said cavity and said aperture each extending continuously from said terminal proximal end to said terminal distal end of said cannula member.
15. The method of claim 14 , further comprising removing said guide wire from said cavity by drawing said guide wire from said cavity into said inner passage through said aperture.
16. The method of claim 14 , further comprising steering said cannula member in response to motion of the guide wire.
17. The method of claim 14 , wherein the guide wire is movable between said inner passage and said cavity through said aperture without moving the guide wire in a direction along said longitudinal axis of the cannula member.
18. The method of claim 14 , wherein the guide wire is movable between said inner passage and said cavity through said aperture at any location along said longitudinal axis of the cannula member.
19. A medical device for placement in an anatomy and for use with a guide wire, the medical device comprising:
a cannula member configured to be inserted into the anatomy, said cannula member having a terminal proximal end, a terminal distal end, and a wall that includes an outer wall surface and an inner wall surface, said inner wall surface defining an inner passage that extends along a longitudinal axis of the medical device from said terminal proximal end to said terminal distal end, said outer wall surface having a circular cross section with an outer diameter, and said inner wall surface having a circular cross section with an inner diameter; and
a guide wire holding member formed in said wall of said cannula member and extending continuously from said terminal proximal end to said terminal distal end of said cannula member, said guide wire holding member defining a cavity in said wall of said cannula member between said outer diameter of said outer wall surface and said inner diameter of said inner wall surface, and
wherein said inner wall surface defines an aperture extending continuously from said terminal proximal end to said terminal distal end of said cannula member, said aperture in communication with said cavity to permit the guide wire to move between said inner passage and said cavity of said cannula member in a direction that is generally perpendicular to said longitudinal axis of the medical device when a longitudinal axis of the guide wire is generally parallel to said longitudinal axis of the medical device.