Vessel occlusion clip and application thereof
An occlusion clip for permanently occluding a bodily vessel, such as the vas deferens. The occlusion clip has a first leg, a second leg, joined on their proximal ends by a spring coil. The spring coil provides a biased torsional force to the first leg and the second leg, to force them into a closed position. The first leg and the second leg have on their distal ends a vessel occlusion portion that occludes the targeted vessel when the clip is in a closed position.
1. A vessel occlusion clip, comprising:
a spring coil having a first terminal end and a second terminal end;
a first leg joined on a proximal end with the first terminal end of the spring coil;
a second leg joined on a proximal end with the second terminal end of the spring coil,
wherein each of the first and second legs has a distal end and comprises a vessel occlusion portion comprising an inner surface adapted to contact and occlude a vessel, said vessel occlusion portion further comprising on its inner surface a proximal projection extending inward from a proximal end of the vessel occlusion portion adjacent the proximal end of each of the first and second legs, a distal projection extending inward from a distal end of said vessel occlusion portion adjacent the distal end, and a planar central region extending from the proximal projection to the distal projection, and
wherein said spring coil provides a torsional force that biases said first leg and said second leg inward toward a closed position in which the distal projections of the vessel occlusion portions of said first and second legs are in forced contact with one another, the proximal projections of the vessel occlusion portions of said first and second legs are in forced contact with one another, and said planar central region of said first leg opposes and is spaced apart from said planar central region of said second leg by a spacing distance determined at least in part by a dimension of each of the proximal projections, thereby forming a vessel occluding space between the planar central regions of the vessel occlusion portions of said first and second legs; and
a transverse alignment mechanism to keep the first and second legs aligned in the closed position, said transverse alignment mechanism comprising:
a first alignment projection extending inward from the distal end of the vessel occlusion portion of the first leg, and
a second alignment projection extending inward from the distal end of the vessel occlusion portion of the second leg,
wherein said first alignment projection provides a mechanical interference point to prevent the second leg from shifting in a transverse direction under the torsional force provided by the spring, and
wherein said second alignment projection provides a mechanical interference point to prevent the first leg from shifting in a transverse direction under the torsional force provided by the spring.
2. The clip recited in claim 1 , wherein at least one of said proximal projections is a tapered projection.
3. The clip recited in claim 1 , wherein at least one of said distal projections is a tapered projection.
4. The clip recited in claim 1 , wherein each of said first and second legs further comprises at least one transversely-extending, cylindrical clip-guide projection on its distal end.
5. The clip recited in claim 1 , further comprising at least one longitudinally extending ridge projecting from the planar central region of the inner surface of the vessel occluding portion and extending from the proximal projection to the distal projection of at least one of said first and said second legs.
6. The clip recited in claim 1 , wherein said spring provides a torsional force of from 0.5 pounds force to 1.0 pounds force.
7. The clip recited in claim 1 , wherein:
said first alignment projection has a first laterally facing surface intermediate the distal end of the vessel occlusion portion of the first leg and an inwardly extending first alignment projection tip,
said second alignment projection has a second laterally facing surface intermediate the distal end of the vessel occlusion portion of the second leg and an inwardly extending second alignment projection tip, and
said first and second laterally facing surfaces being in lateral opposition when said clip is in said closed position.
8. The clip recited in claim 7 , wherein the mechanical interference point of the first alignment projection is part of the first laterally facing surface and the mechanical interference point of the second alignment projection is part of the second laterally facing surface.
9. The clip recited in claim 1 wherein the spring coil comprises a plurality of coil wraps.
10. The clip recited in claim 1 wherein the proximal projection and the distal projection are spaced apart by a distance greater than or equal to a width dimension of the vessel after occlusion.
11. The clip recited in claim 1 wherein the spring coil is formed from metal and the vessel occlusion portion is formed from plastic.
12. A vessel occlusion clip, comprising:
a spring coil having a first terminal end and a second terminal end;
a first leg joined on a proximal end with the first terminal end of the spring coil; and
a second leg joined on a proximal end with the second terminal end of the spring coil;
wherein each of the first and second legs has a distal end and comprises a vessel occlusion portion comprising an inner surface adapted to contact and occlude a vessel; said vessel occlusion portion further comprising on its inner surface a proximal projection extending inward from a proximal end of the vessel occlusion portion adjacent the proximal end of each of the first and second legs, a distal projection extending inward from a distal end of said vessel occlusion portion adjacent the distal end, a planar central region extending from the proximal projection to the distal projection and having first and second lateral edges, and a longitudinal ridge projecting inward from the planar central region and extending from the proximal projection to the distal projection, the longitudinal ridge being spaced apart from each of the first and second lateral edges;
wherein said spring coil provides a torsional force that biases said first leg and said second leg inward toward a closed position in which at least a portion of the distal projections of the vessel occlusion portions of said first and second legs are in forced contact with one another, at least a portion of the proximal projections of the vessel occlusion portions of said first and second legs are in forced contact with one another, and said planar central region of said first leg opposes and is spaced apart from said planar central region of said second leg by a spacing distance determined at least in part by a dimension of each of the proximal projections, thereby forming a vessel occluding space between the central regions of the vessel occlusion portions of said first and second legs.
13. The clip recited in claim 12 wherein the longitudinal ridge has a rounded inward facing surface.