US5417665A
Expired / Lapsed
US
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Intravascular cannula
Assignee: Cordis Corp
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Filing: 1993-10-19
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Granted: 1995-05-23
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Expires: 2013-10-19
Abstract
Abstract An intravascular catheter comprises a plastic tube of a diameter capable of occupying a blood vessel. The plastic tube defines a tapered distal tip. The distal tip comprises an annular, distal end portion having an outer diameter that tapers at a first acute angle to the tube longitudinal axis, distally and inwardly to a thin, annular, distal end surface. The tube also defines a second, tapered, annular portion proximal of and next to the annular, distal end portion. The second portion defines an outer diameter that tapers distally and inwardly down to an outer diameter of essentially no less than the maximum outer diameter of the annular, distal end portion. The second portion tapers at a second acute angle to the longitudinal axis, which is less than the first acute angle. Also, an improved composition for the cannula tube is disclosed.
Inventors
- 👤 Carlo R. De La Mata
- 👤 Luis A. Davila
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:52
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/01; A61M25/06; A61M25/0606
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
133 words
An intravascular cannula which comprises a plastic tube of a diameter capable of occupying a blood vessel, said plastic tube defining a tapered, distal tip, said distal tip comprising an annular, distal end portion having an outer diameter that tapers at a first acute angle to the tube longitudinal axis distally and inwardly to a thin, annular, distal end surface, said tube also defining a second, tapered, annular portion proximal and immediately of adjacent to said annular, distal end portion, said second portion defining an outer diameter that tapers distally and inwardly down to an outer diameter of essentially no less than the maximum outer diameter of said annular distal end portion, said second portion tapering at a second acute angle to said longitudinal axis which is less than said first acute angle.
Claim 2
Dependent Claim
133 words
An intravascular cannula which comprises a plastic tube of a diameter capable of occupying a blood vessel, said plastic tube defining a tapered, distal tip, said distal tip comprising an annular, distal end portion having an outer diameter that tapers at a first acute angle to the tube longitudinal axis distally and inwardly to a thin, annular, distal end surface, said tube also defining a second, tapered, annular portion proximal and immediately of adjacent to said annular, distal end portion, said second portion defining an outer diameter that tapers distally and inwardly down to an outer diameter of essentially no less than the maximum outer diameter of said annular distal end portion, said second portion tapering at a second acute angle to said longitudinal axis which is less than said first acute angle.
Claim 3
Dependent Claim
14 words
The cannula of claim 1 in which said first angle is 30° to 60°.
Claim 4
Dependent Claim
14 words
The cannula of claim 1 in which said second angle is 5° to 20°.
Claim 5
Dependent Claim
21 words
The cannula of claim 1 in which said second portion is 8 to 15 times the length of the first portion.
Claim 6
Dependent Claim
23 words
The cannula of claim 1 in which said plastic is polyether block polyamide filled with 10 to 20 weight percent of bismuth subcarbonate.
Claim 7
Dependent Claim
12 words
The cannula of claim 1 which is an arterial catheter sheath introducer.
Claim 8
Dependent Claim
23 words
The cannula of claim 1 in which said thin, annular, distal end surface has a wall thickness of essentially 0.0001 to 0.001 inch.
Claim 9
Dependent Claim
33 words
The cannula of claim 1, in combination with a dilator wire stylette occupying the lumen of said cannula, said dilator wire stylette having a tapered tip projecting distally from said cannula distal tip.
Claim 10
Dependent Claim
139 words
An intravascular cannula which comprises a plastic tube of a diameter capable of occupying a blood vessel, said plastic tube defining a tapered distal tip, said distal tip comprising an annular, distal end portion having an outer diameter that tapers at a first acute angle of 30° to 60° to the tube longitudinal axis, distally and inwardly to a thin, annular, distal end surface, said tube also defining a second, tapered, annular portion proximal of and abutting said annular, distal end portion, said second portion defining an outer diameter that tapers distally and inwardly down to an outer diameter of essentially no less than the maximum outer diameter of said annular distal end portion, said end portion tapering at a second acute angle of 3° to 20° to said longitudinal axis which is less than said first acute angle.
Claim 11
Dependent Claim
139 words
An intravascular cannula which comprises a plastic tube of a diameter capable of occupying a blood vessel, said plastic tube defining a tapered distal tip, said distal tip comprising an annular, distal end portion having an outer diameter that tapers at a first acute angle of 30° to 60° to the tube longitudinal axis, distally and inwardly to a thin, annular, distal end surface, said tube also defining a second, tapered, annular portion proximal of and abutting said annular, distal end portion, said second portion defining an outer diameter that tapers distally and inwardly down to an outer diameter of essentially no less than the maximum outer diameter of said annular distal end portion, said end portion tapering at a second acute angle of 3° to 20° to said longitudinal axis which is less than said first acute angle.
Claim 12
Dependent Claim
24 words
The cannula of claim 9 in which said tube is made of a plastic having a Shore D durometer of essentially 65 to 75.
Claim 13
Dependent Claim
24 words
The cannula of claim 10 in which said plastic is a polyether block polyamide filled with 10 to 20 weight percent of bismuth subcarbonate.
Claim 14
Dependent Claim
23 words
The cannula of claim 11 in which said thin, annular, distal end surface has a wall thickness of essentially 0.0001 to 0.001 inch.
Claim 15
Dependent Claim
33 words
The cannula of claim 12 in combination with a dilator wire stylette occupying the lumen of said cannula, said dilator wire stylette having a tapered tip projecting distally from said cannula distal tip.
Claim 16
Dependent Claim
94 words
An arterial catheter sheath introducer which comprises a plastic tube of a diameter capable of occupying a blood vessel, a proximal hub carried on an end of said tube, a slit elastomeric partition valve carried in said hub, permitting an elongated member to penetrate through the entire length of said catheter sheath introducer without back leakage of fluids through said catheter sheath introducer, said tube being made of a plastic having a Shore D durometer of essentially 65-75, a break tensile strength of 7500 to 9000 psi, and an elongation to break of 350-550.
Claim 17
Dependent Claim
94 words
An arterial catheter sheath introducer which comprises a plastic tube of a diameter capable of occupying a blood vessel, a proximal hub carried on an end of said tube, a slit elastomeric partition valve carried in said hub, permitting an elongated member to penetrate through the entire length of said catheter sheath introducer without back leakage of fluids through said catheter sheath introducer, said tube being made of a plastic having a Shore D durometer of essentially 65-75, a break tensile strength of 7500 to 9000 psi, and an elongation to break of 350-550.
Claim 18
Dependent Claim
20 words
The cannula of claim 14 in which said plastic is filled with 10 to 20 weight percent of bismuth subcarbonate.
Claim 19
Dependent Claim
28 words
The catheter sheath introducer of claim 15 in which said cannula defines a thin, annular, distal end surface having a wall thickness of essentially 0.0001 to 0.001 inch.
Claim 20
Dependent Claim
35 words
The catheter sheath introducer of claim 14, in combination with a dilator wire stylette occupying the lumen of said cannula, said dilator wire stylette having a tapered tip projecting distally from said cannula distal tip.
Claim 21
Dependent Claim
16 words
The catheter sheath introducer of claim 14 in which said plastic is a polyether block polyamide.
Claim 22
Dependent Claim
16 words
The catheter sheath introducer of claim 15 in which said plastic is a polyether block polyamide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-05-22 | 1998-11-21 | 1999-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-05-22 | 2002-11-21 | 2003-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-05-22 | 2006-11-21 | 2007-05-23 | $7700.00 | Window Closed / Lapsed |