System and method of use for revascularizing stenotic bypass grafts and other blood vessels
First Claim
1. An intravascular system for opening a lumen in an occluded blood vessel portion of a living being'"'"'s vascular system, the occluded blood vessel portion being occluded by an occlusive material, said system comprising an instrument and debris extraction means, said instrument having an exterior surface and a working head and being arranged to be located within the being'"'"'s vascular system, whereupon a passageway is established outside said exterior surface of said instrument and within the being'"'"'s vascular system, said working head being arranged to operate on the occlusive material in the interior of the occluded blood vessel portion to open a lumen therein for the flow of blood therethrough, whereupon some debris may be produced from the occlusive material by the operation of said working head, said debris extraction means introducing an infusate liquid at a first flow rate adjacent said working head and withdrawing said liquid at a second and higher flow rate through said passageway to create a differential flow adjacent said working head, whereupon debris produced by the operation of said working head is withdrawn through said passageway by said differential flow for collection remote from the occluded vessel portion and is prevented from flowing into any upstream blood vessel or downstream blood vessel.
1 Assignment
0 Petitions
Accused Products
Abstract
A system and method for opening a lumen in an occluded blood vessel, e.g., a coronary bypass graft, of a living being'"'"'s vascular system. The system comprises an instrument having a working head, e.g., a rotary impacting impeller located within an apertured shroud, and a debris extraction sub-system. The instrument is located within a guide catheter. The working head is arranged to operate on, e.g., impact, the occlusive material in the occluded vessel to open a lumen therein, whereupon some debris may be produced by the operation of the working head on the occlusive material. The debris extraction sub-system introduces an infusate liquid at a first flow rate adjacent the working head, e.g., through a opening in the shroud, and withdraws that liquid and some blood at a second and higher flow rate, e.g., through the guide catheter. This action creates a differential flow adjacent the working head, whereupon debris produced by the operation of the working head is withdrawn in the infusate liquid and blood by the differential flow for collection outside the being'"'"'s body. The introduction of the infusate liquid establishes an unbalanced flow adjacent the working head to enable the catheter to be steered hydrodynamically.
343 Citations
53 Claims
- 1. An intravascular system for opening a lumen in an occluded blood vessel portion of a living being'"'"'s vascular system, the occluded blood vessel portion being occluded by an occlusive material, said system comprising an instrument and debris extraction means, said instrument having an exterior surface and a working head and being arranged to be located within the being'"'"'s vascular system, whereupon a passageway is established outside said exterior surface of said instrument and within the being'"'"'s vascular system, said working head being arranged to operate on the occlusive material in the interior of the occluded blood vessel portion to open a lumen therein for the flow of blood therethrough, whereupon some debris may be produced from the occlusive material by the operation of said working head, said debris extraction means introducing an infusate liquid at a first flow rate adjacent said working head and withdrawing said liquid at a second and higher flow rate through said passageway to create a differential flow adjacent said working head, whereupon debris produced by the operation of said working head is withdrawn through said passageway by said differential flow for collection remote from the occluded vessel portion and is prevented from flowing into any upstream blood vessel or downstream blood vessel.
- 33. An intravascular system for opening a lumen in an occluded blood vessel portion of a living being'"'"'s vascular system, said occluded blood vessel portion being occluded by an occlusive material, said system comprising an instrument, a catheter and debris extraction means, said instrument including a working head, said instrument being located within said catheter, said working head being arranged to operate on the occlusive material in the interior of the occluded blood vessel portion to open a lumen therein for the flow of blood therethrough, whereupon some debris may be produced from the occlusive material by the operation of said working head, said debris extraction means including debris removal means coupled to said catheter, said debris extraction means being arranged for introducing an infusate liquid through said instrument at a first flow rate to a position adjacent said working head, said debris extraction being also being arranged for withdrawing said liquid at a second and higher flow rate to create a differential flow adjacent said working head, whereupon debris produced by the operation of said working head is withdrawn by said differential flow for collection remote from the occluded vessel portion and is prevented from flowing into any upstream blood vessel or downstream blood vessel, said infusate liquid and the debris therein being withdrawn from the occluded blood vessel portion through said passageway under the influence of said debris removal means.
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41. A method for opening a lumen in an occluded blood vessel portion of a living being'"'"'s vascular system located downstream of a first blood vessel portion from which blood will flow to the occluded blood vessel portion, the occluded blood vessel portion being occluded by an occlusive material and being located upstream of a second blood vessel portion, said method comprising:
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(a) providing a working head and debris extraction means within the being'"'"'s vascular system, (b) operating said working head on the occlusive material in the interior of the occluded blood vessel portion to open a lumen for the flow of blood therethrough to said second blood vessel portion, whereupon some debris may be produced from the occlusive material by the operation of said working head, (c) causing said debris extraction means to introduce an infusate liquid at a first flow rate adjacent said working head, and (d) causing said debris extraction means to withdraw said liquid at a second and higher flow rate to create a differential flow adjacent said working head, whereupon debris produced by the operation of said working head is withdrawn for collection remote from the occluded blood vessel portion. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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Specification