Helical embolization coil
First Claim
1. An embolization coil (10) comprising:
- a wire strand (11) wound into a longitudinally extending coil (12) having a plurality of tightly spaced turns (13), said longitudinally extending coil wound into a first conically helically shaped coil (15) having a first plurality of radially expanding turns (16) expanding in a first direction (44) and into a second conically helically shaped coil (45) having a second plurality of radially expanding turns (46) expanding in a second direction (47) generally opposite to said first direction (44), the turns of at least one of said first and said second plurality of radially expanding turns longitudinally overlapping each other, whereby the turns of said at least one of said first and said second plurality of radially expanding turns longitudinally contact each other in response to blood flowing therethrough to occlude a vessel in which the embolization coil is positioned.
1 Assignment
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Accused Products
Abstract
A conically helically shaped embolization coil (10) for occluding a blood vessel, aneurysm, and the like. The embolization coil includes a continuous platinum-tungsten alloy wire strand (11) wound into a longitudinally extending coil (12) having a plurality of tightly spaced turns (13). The longitudinally extending coil is wound into a conically helically shaped coil (15) with a plurality of radially expanding turns (16). Distal turn (17) of the radially expanding turns has a minor diameter (18) less than a minimum diameter (34) of a vessel (32) of which the embolization is to be positioned therein. Uncompressed proximal turn (19) of the radially expanding turns has a major diameter (20) greater than a maximum diameter (33) of the vessel in which the coil to be positioned. The coil is stress relieved and, in particular, heat treated by heating the coil to a stress relief temperature of the continuous wire strand and cooled to relieve residual stresses formed during the winding of the coil and to minimize the formation of new residual stresses formed during the cool down period of the heat treatment. Thrombogenic fibers (26) are positioned in the tightly spaced turns of the coil to attract thrombus and build up a mass that occludes the vessel lumen. The embolization coil (10) can also include first and second conically helically shaped coils (15, 45) that expand radially in generally opposite directions. The multiple helically shaped coils (15, 45) of the embolization coil accurately and centrally position the embolization coil in the vessel. Each coil acts as an anchor for the other to cause the turns of the coil to make longitudinal contact with each other regardless of the direction of blood flow thereagainst. The longitudinally extending coil (12) of the embolization coil (10) can also be formed to include distal and proximal end turns extending longitudinally from the conically helically shaped coil (15) to better affix and centrally position the embolization coil at the occlusion site.
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Citations
20 Claims
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1. An embolization coil (10) comprising:
a wire strand (11) wound into a longitudinally extending coil (12) having a plurality of tightly spaced turns (13), said longitudinally extending coil wound into a first conically helically shaped coil (15) having a first plurality of radially expanding turns (16) expanding in a first direction (44) and into a second conically helically shaped coil (45) having a second plurality of radially expanding turns (46) expanding in a second direction (47) generally opposite to said first direction (44), the turns of at least one of said first and said second plurality of radially expanding turns longitudinally overlapping each other, whereby the turns of said at least one of said first and said second plurality of radially expanding turns longitudinally contact each other in response to blood flowing therethrough to occlude a vessel in which the embolization coil is positioned. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An embolization coil (10) comprising:
a wire strand (11) wound into a longitudinally extending coil (12) having a plurality of tightly spaced turns (13), said longitudinally extending coil wound into a conically helically shaped coil (15) having a plurality of radially expanding turns (16) expanding in a first direction (44), said plurality of radially expanding turns longitudinally overlapping each other and including a distal turn (17) having a minor diameter (18) said longitudinally extending coil (12) being also wound into at least one end turn (48) extending from said distal turn of said plurality of radially expanding turns in a second direction (47) generally opposite to said first direction and having an end diameter (49) larger than said minor diameter, whereby said radially expanding turns longitudinally contact each other in response to blood flowing therethrough to occlude a site in which the embolization coil is positioned. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An embolization coil (10) comprising:
a wire strand (11) wound into a longitudinally extending coil (12) having a plurality of tightly spaced turns (13), said longitudinally extending coil wound into a conically helically shaped coil (15) having a plurality of radially expanding turns (16), said plurality of radially expanding turns longitudinally overlapping each other and including a distal turn (17) having a minor diameter (18) and a proximal turn (19) having a major diameter (20), said longitudinally extending coil being also wound into at least one proximal end turn (50) extending from said first proximal turn and having an end diameter (51) no greater than said major diameter, whereby said radially expanding turns longitudinally contact each other in response to blood flowing against to occlude a site in which the embolization coil is positioned. - View Dependent Claims (16, 17, 18, 19, 20)
Specification