Devices and methods for pressure-responsive reshaping of blood vessels
First Claim
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1. A system for controlling blood flow through a vein, said system comprising:
- (a) a clip being sized and configured for compressing a region of the vein when positioned therethrough to reduce blood flow through the vein; and
(b) a delivery device comprising a needle cannula, an over tube disposed over a proximal portion of the cannula, and an inner tube within a lumen of the needle cannula, said needle cannula having a tissue-penetrating distal end for penetrating tissue overlying a vein and delivering clip through said walls of the vein;
wherein said clip comprises an elongated coil which is wrapped tightly about an outer surface of the needle cannula in a delivery configuration and wherein said over tube holds a proximal end of the coil and the inner tube holds the distal end of the coil in said delivery configuration; and
wherein the over tube is configured to be reacted to release the proximal end of the coil and the inner tube is configured to be retracted to release the distal end of the coil, wherein the coil elastically recoils and foreshortens to form an upper flange configured to engage an upper wall of the vein and a lower flange configured to engage a lower wall of the vein.
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Abstract
A device for controlling blood flow through a vein is provided. The device includes a device body configured for implantation in or around the vein. The device body is capable of reducing flow through the vein in response to an increase in tissue pressure around the vein.
18 Citations
11 Claims
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1. A system for controlling blood flow through a vein, said system comprising:
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(a) a clip being sized and configured for compressing a region of the vein when positioned therethrough to reduce blood flow through the vein; and (b) a delivery device comprising a needle cannula, an over tube disposed over a proximal portion of the cannula, and an inner tube within a lumen of the needle cannula, said needle cannula having a tissue-penetrating distal end for penetrating tissue overlying a vein and delivering clip through said walls of the vein; wherein said clip comprises an elongated coil which is wrapped tightly about an outer surface of the needle cannula in a delivery configuration and wherein said over tube holds a proximal end of the coil and the inner tube holds the distal end of the coil in said delivery configuration; and wherein the over tube is configured to be reacted to release the proximal end of the coil and the inner tube is configured to be retracted to release the distal end of the coil, wherein the coil elastically recoils and foreshortens to form an upper flange configured to engage an upper wall of the vein and a lower flange configured to engage a lower wall of the vein. - View Dependent Claims (2, 3, 4, 5)
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6. A method of controlling blood flow through a vein comprising:
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(a) delivering a clip having two ends through walls of the vein, wherein the clip is in an elongated coil when delivered through the walls of the vein (b) releasing one end of the coil above an upper wall of the coil and another end of the coil below a lower wall of the vein, wherein the coil elastically recoils and foreshortens to form an upper flange engaging the upper wall of the vein and a lower flange engaging a lower wall of the vein to thereby compress a middle region of the vein and reduce flow therethrough. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification