Intra vascular snare and method of forming the same
First Claim
Patent Images
1. An intravascular snare comprising:
- a plurality of adjacent elongate loops each having a proximal end and a looped distal end, the distal end of each of said loops being free and not interconnected with adjacent loops, said loops are formed of shape memory material having an austenitic and martensitic state being curved at the distal end of the loop to form two elongate, spaced sides for the loop which angle toward one another from the distal end to the proximal end of the loop, each side of each said loop being directly interconnected with a side of an adjacent loop at only one joinder point spaced from the proximal and distal end thereof, and a shaft connected to the proximal ends of said loops, said proximal ends being gathered together at said shaft.
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Abstract
The intravascular snare is formed with a central shaft which is attached to the proximal ends of a plurality of loops. The loops are connected together at joinder points spaced from both the distal and proximal ends of the loops to maintain the relative geometry of the loops in both an expanded and compressed condition. The loops include a material which provides radiopacity.
258 Citations
29 Claims
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1. An intravascular snare comprising:
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a plurality of adjacent elongate loops each having a proximal end and a looped distal end, the distal end of each of said loops being free and not interconnected with adjacent loops, said loops are formed of shape memory material having an austenitic and martensitic state being curved at the distal end of the loop to form two elongate, spaced sides for the loop which angle toward one another from the distal end to the proximal end of the loop, each side of each said loop being directly interconnected with a side of an adjacent loop at only one joinder point spaced from the proximal and distal end thereof, and a shaft connected to the proximal ends of said loops, said proximal ends being gathered together at said shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An intravascular snare comprising:
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at least three adjacent loops which are equal in length each having a proximal end and a looped distal end, the distal end of each of said loops being free and not interconnected with adjacent loops, said loops are formed of shape memory material having an austenitic and martensitic state with each said loop including a plurality of strands being interconnected with an adjacent loop at a joinder point spaced from the proximal and distal end thereof, the joinder points between said loops forming an equal sided geometric figure by separating strands of one loop forming a space and passing the adjacent loop directly through the space formed between the strands of the one loop, and a shaft connected to the proximal ends of said loops, said proximal ends being gathered together at said shaft. - View Dependent Claims (13)
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14. An intravascular snare comprising:
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a plurality of adjacent loops each formed of multistrand material and each having a proximal end and a looped distal end, the distal end of each of said loops being free and not interconnected with adjacent loops, each said loop being interconnected with an adjacent loop at a joinder point spaced from the proximal and distal end thereof, each of said joinder points being formed by separating strands of one loop forming a space and passing the adjacent loop directly through the space formed between the strands of the one loop, and a shaft connected to the proximal ends of said loops, said proximal ends being gathered together at said shaft. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. An intravascular snare comprising:
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at least three adjacent loops each formed of multistrand braided material and each having a proximal end and a looped distal end, the distal end of each of said loops being free and not interconnected with adjacent loops, each said loop being interconnected with an adjacent loop at a joinder point spaced from the proximal and distal end thereof, each of said joinder points being formed by separating strands of one loop forming a space and passing the adjacent loop directly through the space formed between the strands of the one loop wherein the joinder points between the loops form an isosceles triangle, a shaft connected to the proximal ends of said loops, said proximal ends being gathered together at said shaft, and each loop adjacent to the proximal end thereof extends laterally outward from said shaft at substantially a fifteen degree angle and at a point spaced between said shaft and the distal end of said loop angles laterally outward for substantially an additional fifteen degrees. - View Dependent Claims (22, 23)
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24. A method for altering the remembered shape of a medical device formed of shape memory material having an austenitic and a martensitic state which includes
forming the medical device to have a first remembered shape in the austenitic state, causing the medical device to enter the martensitic state, mechanically deforming the medical device while in the martensitic state, and causing the medical device to return to the austenitic state and a new second remembered shape resulting from the mechanical deformation in the martensitic state which is different from said first remembered shape.
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26. An intravascular snare comprising:
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at least three elongate loops of substantially equal length each having a proximal end and a looped distal end, the distal end of each of said loops being See and not interconnected with adjacent loops, each loop being formed of a length of elongate material curved at the distal end of the loop to form two elongate spaced sides for the loop, each of which terminates at a free end of the proximal end of the loop, each side of each said loop being directly interconnected at only one joinder point with a side of an adjacent loop and each loop is directly interconnected at two joinder points to two adjacent loops, the joinder points for all of said plurality of loops being spaced from the proximal and distal ends of said loops and substantially equally spaced relative to said proximal and distal ends wherein the joinder points between the loops form an isosceles triangle, and a shaft connected to the proximal ends of said loops, the free ends of the sides of said loops being gathered together at said shaft, each said loop adjacent to the proximal end thereof extending laterally outward at an angle from said shaft. - View Dependent Claims (27, 28, 29)
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Specification