Variable tip catheter
First Claim
1. A therapeutic catheter for increasing myocardial blood perfusion, having a longitudinal axis and transverse planes transverse to said longitudinal axis, comprising:
- an inner shaft having a proximal region and a distal region;
a therapeutic tip disposed on said inner shaft distal region having means for penetrating said myocardium;
an outer shaft having a distal region and having said inner shaft disposed within;
an atraumatic distal tip disposed proximate said outer shaft distal region, said atraumatic distal tip having a first configuration having a first transverse profile and a second configuration having a second transverse profile greater than said first transverse profile; and
means for urging said atraumatic tip from said first configuration to said second configuration.
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0 Petitions
Accused Products
Abstract
Therapeutic catheters for increasing myocardial blood perfusion in procedures including percutaneous myocardial revascularization (PMR), which can include tips for cutting into the myocardium to stimulate a healing response and/or for injecting angiogenic substances. PMR catheters can include an outer shaft slidably housing an inner shaft having a distal therapeutic tip. The outer shaft can be slidably disposed in a guide catheter and have an expandable atraumatic distal tip for presenting an enlarged distal profile against the heart chamber wall. The enlarged atraumatic profile can reduce the likelihood of the outer shaft penetrating undesirably into the myocardium. One expandable distal tip expands radially when forced against the endocardium. Another expandable tip expands when unconstrained by the guide catheter. Yet another expandable tip expands when manipulated by an elongate manipulation member.
135 Citations
42 Claims
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1. A therapeutic catheter for increasing myocardial blood perfusion, having a longitudinal axis and transverse planes transverse to said longitudinal axis, comprising:
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an inner shaft having a proximal region and a distal region;
a therapeutic tip disposed on said inner shaft distal region having means for penetrating said myocardium;
an outer shaft having a distal region and having said inner shaft disposed within;
an atraumatic distal tip disposed proximate said outer shaft distal region, said atraumatic distal tip having a first configuration having a first transverse profile and a second configuration having a second transverse profile greater than said first transverse profile; and
means for urging said atraumatic tip from said first configuration to said second configuration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A therapeutic catheter for increasing myocardial blood perfusion, having a longitudinal axis and comprising:
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an inner shaft having a proximal region and a distal region;
a therapeutic tip disposed on said inner shaft distal region;
an outer shaft having a distal region and having said inner shaft disposed within; and
an atraumatic distal tip disposed proximate said outer shaft distal region, said atraumatic distal tip having said inner shaft distal region disposed within, said atraumatic distal tip having a first configuration having a first radial dimension and a second configuration having a second radial dimension greater than said first radial dimension, said atraumatic distal tip being sufficiently expandable to change from said first configuration to said second configuration in response to a proximally directed longitudinal force against said atraumatic tip, such that said tip is longitudinally foreshortened and radially expanded in response to being longitudinally forced against an obstacle. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A therapeutic catheter for increasing myocardial blood perfusion, having a longitudinal axis and comprising:
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an inner shaft having a proximal region and a distal region;
a therapeutic tip disposed on said inner shaft distal region;
an outer shaft having a distal region and having said inner shaft disposed within; and
an atraumatic distal tip disposed proximate said outer shaft distal region, said atraumatic distal tip having said therapeutic tip disposed within, said atraumatic distal tip having a first, unconstrained configuration having a first radial dimension and a second, constrained configuration having a second radial dimension less than said first radial dimension, said atraumatic distal tip being sufficiently flexible and elastic to change from said first configuration to said second configuration in response to a being disposed within a third shaft having an inner diameter less than said first radial dimension, and to change from said second configuration to said first configuration in response to being freed from inside said third shaft. - View Dependent Claims (20, 21, 22, 23)
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24. A therapeutic catheter for increasing myocardial blood perfusion, having a longitudinal axis and comprising:
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an inner shaft having a proximal region and a distal region;
a therapeutic tip disposed on said inner shaft distal region;
an outer shaft having a distal region, a distal end, and having said inner shaft disposed within;
an inflation lumen disposed within said outer shaft; and
an inflatable atraumatic distal stop disposed proximate said outer shaft distal region and proximal of said outer shaft distal end and having an interior in fluid communication with said inflation lumen, said atraumatic distal stop having a first configuration having a first radial dimension when uninflated and a second configuration having a second radial dimension when inflated, said second radial dimension being greater than said first radial dimension. - View Dependent Claims (25, 26)
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27. A therapeutic catheter for increasing myocardial blood perfusion, having a longitudinal axis and comprising:
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an outer elongate shaft having a longitudinal axis, a distal end, and a lumen therethrough;
an inner elongate shaft disposed within said outer shaft lumen and having a therapeutic distal tip;
a plurality of expandable members affixed to said outer shaft distal end, said expandable members having a first, unexpanded position having a first transverse profile and a second, expanded position having a second transverse profile greater than said first transverse profile; and
means for urging said expandable members from said first position to said second position. - View Dependent Claims (28, 30, 31)
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- 29. A therapeutic catheter as recited in claim as in 27, wherein said means for urging said expandable members includes forming said members of a shape memory material having said second position near body temperature.
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34. A therapeutic catheter for increasing myocardial blood perfusion, having a longitudinal axis and comprising:
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a first, outer shaft having a first lumen therethrough, a distal region, a distal end region distal of said distal region, and a distal most end distal of said distal end region, said distal end region being weaker in compression than said distal region, said distal end region having a first transverse profile when not in compression and a second transverse profile when in compression, said second profile being greater than said first profile; and
a second, inner shaft disposed within said first lumen and having a distal end secured to said first shaft distal most region, such that retracting said inner shaft proximally retracts said first shaft distal most end and compresses said distal region to increase said transverse profile from said first position to said second position. - View Dependent Claims (35)
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36. A therapeutic catheter for increasing myocardial blood perfusion, having a longitudinal axis and transverse planes transverse to said longitudinal axis, comprising:
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a shaft having a proximal region and a distal region;
a therapeutic tip disposed on said shaft distal region and having means for penetrating said myocardium; and
an atraumatic distal tip disposed proximate said shaft distal region, said atraumatic distal tip having a first configuration having a first transverse profile and a second configuration having a second transverse profile greater than said first transverse profile. - View Dependent Claims (37, 38, 39, 40, 41, 42)
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Specification