US4935017A
Expired / Lapsed
US
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Variable shaped catheter system and method for catheterization
Assignee: Medtronic Vascular Inc
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Filing: 1988-04-29
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Granted: 1990-06-19
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Expires: 2008-04-29
Abstract
Abstract A catheter assembly and method for catheterization provides a means by which the curved configuration at the distal portion of a catheter can be varied while the catheter system remains in the patient. The catheter, having a predetermined curve at its distal end is received within a sheath that can be advanced over the distal end to tend to straighten the curve in the distal end of the catheter. The extent to which the sheath is advanced over the curved distal portion of the catheter controls the degree to which the catheter is straightened. The position of the sheath relative to the catheter can be adjusted while the catheter is in the patient, thereby enabling change in catheter shape without requiring catheter exchanges. For example, the system enables right and left coronary angiographic procedures to be performed without changing catheters. Left ventricular studies also can be made without catheter exchanges.
Inventors
- 👤 John T. Sylvanowicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:42
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/0021; A61M25/0041; A61M25/01; A61M25/09; A61M25/09016; A61M25/09025
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
157 words
A variable shaped angiographic catheter assembly comprising; flexible elongated catheter having a proximal end and a distal end, and a distal portion formed to a predetermined curved shape; a flexible sheath having a proximal end, a distal end and an internal diameter adapted to receive the catheter and to enable longitudinal movement of the catheter within the sheath, the sheath being shorter than the catheter by an amount at least as great as the length of the curved distal portion of the catheter, the sheath having a degree of flexibility with respect to the catheter such that when the sheath is advanced over the curved portion of the catheter, the distal portion of the catheter and the sheath together assume a curve that is a less curved configuration whereby the shape of the curve at the distal end of the catheter can be controlled by adjusting the longitudinal position of the sheath with respect to the catheter.
Claim 2
Dependent Claim
157 words
A variable shaped angiographic catheter assembly comprising; flexible elongated catheter having a proximal end and a distal end, and a distal portion formed to a predetermined curved shape; a flexible sheath having a proximal end, a distal end and an internal diameter adapted to receive the catheter and to enable longitudinal movement of the catheter within the sheath, the sheath being shorter than the catheter by an amount at least as great as the length of the curved distal portion of the catheter, the sheath having a degree of flexibility with respect to the catheter such that when the sheath is advanced over the curved portion of the catheter, the distal portion of the catheter and the sheath together assume a curve that is a less curved configuration whereby the shape of the curve at the distal end of the catheter can be controlled by adjusting the longitudinal position of the sheath with respect to the catheter.
Claim 3
Dependent Claim
55 words
A catheter assembly as defined in claim 1 further comprises; the catheter having a lumen extending from its proximal to its distal end and being open at its distal end and a fitting on the proximal end of the catheter in communication with the proximal end of the lumen for connection to a fluid instrumentality.
Claim 4
Dependent Claim
16 words
A catheter assembly as defined in claim 1 wherein the catheter comprises a coronary angiographic catheter.
Claim 5
Dependent Claim
21 words
A catheter assembly as defined in claim 1 wherein said catheter has a Judkins left curve formed in the distal portion.
Claim 6
Dependent Claim
21 words
A catheter assembly as defined in claim 1 wherein said sheath is approximately 5 to 30 centimeters shorter than the catheter.
Claim 7
Dependent Claim
94 words
A catheter assembly as defined in claim 1 further comprising: the internal diameter of the sheath being greater than the outer diameter of the catheter thereby to define an annular space extending along the length of the assembly; the distal end of the sheath being tapered to merge smoothly with and to contact the outer diameter of the catheter; at least one side hole formed at the distal portion of the sheath; a fitting at the proximal end of the sheath in communication with the annular flow space for connection to a fluid instrumentality.
Claim 8
Dependent Claim
40 words
A catheter assembly as defined in claim 1 further comprises; a fitting on the proximal end of the sheath, the catheter extending through the fitting, the fitting having a gasket adapted to contact and seal the periphery of the catheter.
Claim 9
Dependent Claim
26 words
A catheter assembly as defined in claim 7 wherein the seal is adjustable thereby to vary the degree with which the gasket seals against the catheter.
Claim 10
Dependent Claim
30 words
A variable shaped catheter assembly as defined in claim 1 wherein the sheath is dimensioned so that it contacts the outer surface of the catheter in close sliding contact therewith.
Claim 11
Dependent Claim
19 words
A catheter assembly as defined in claim 9 wherein the sheath is formed from a low friction polymeric material.
Claim 12
Dependent Claim
23 words
A catheter assembly as defined in claim 1 wherein the catheter is approximately 125 centimeters long and sheath is approximately 115 centimeters long.
Claim 13
Dependent Claim
20 words
A catheter assembly as defined in claim 11 wherein the catheter curve is formed to define a Judkins left shape.
Claim 14
Dependent Claim
15 words
A catheter assembly as defined in claim 1 wherein the catheter is an angiographic catheter.
Claim 15
Dependent Claim
15 words
A catheter assembly as defined in claim 1 wherein the catheter is a cardiovascular catheter.
Claim 16
Dependent Claim
116 words
A percutaneously insertable variable shaped angiographic catheter assembly as defined in claim 1 further comprising: the catheter having a lumen extending from its proximal to its distal end, the lumen being adapted to receive a guidewire; the distal tip of the catheter being tapered to merge smoothly with and to contact the outer diameter of a guidewire when a guidewire is received in the lumen; the distal tip of the sheath being tapered to merge smoothly with and to contact the outer diameter of the catheter whereby the assembly of the catheter and sheath may be inserted percutaneously into a blood vessel over a guidewire inserted into the blood vessel, said tapered portions forming self-dilating means.
Claim 17
Dependent Claim
24 words
A catheter assembly as defined in claim 1 or 15 in which the sheath is from a material having a high degree of radiopacity.
Claim 18
Independent Claim
278 words
A method for performing an angiographic catherization comprising: providing a variable shaped angiographic catheter assembly including a flexible elongated catheter having a proximal end and a distal end, and a distal portion formed to a predetermined curved shape and a flexible sheath having a proximal end, a distal end and an internal diameter adapted to receive the catheter and to enable longitudinal movement of the catheter within the sheath, the sheath being shorter than the catheter by an amount at least as great as the length of the curved distal portion of the catheter, the sheath having a degree of flexibility with respect to the catheter such that when the sheath is advanced over the curved portion of the catheter, the distal portion of the catheter and the sheath together assume a curve that is a less curved configuration whereby the shape of the curve at the distal end of the catheter can be controlled by adjusting the longitudinal position of the sheath with respect to the catheter; inserting said catheter assembly into a patient's cardiovascular system; positioning the sheath of the assembly at a selected location to cause the distal end of the catheter to assume one curve with the catheter in that curve being adapted to perform a first angiographic catheterization procedure; while maintaining the catheter in said first curve configuration, performing said first catheterization procedure; thereafter shifting the position of the sheath with respect to the catheter thereby to change the curve at the distal end of the catheter to a second configuration adapted to perform a second angiographic catheterization procedure; while maintaining said catheter in said second curve configuration, performing said second catheterization procedure.
Claim 19
Independent Claim
278 words
A method for performing an angiographic catherization comprising: providing a variable shaped angiographic catheter assembly including a flexible elongated catheter having a proximal end and a distal end, and a distal portion formed to a predetermined curved shape and a flexible sheath having a proximal end, a distal end and an internal diameter adapted to receive the catheter and to enable longitudinal movement of the catheter within the sheath, the sheath being shorter than the catheter by an amount at least as great as the length of the curved distal portion of the catheter, the sheath having a degree of flexibility with respect to the catheter such that when the sheath is advanced over the curved portion of the catheter, the distal portion of the catheter and the sheath together assume a curve that is a less curved configuration whereby the shape of the curve at the distal end of the catheter can be controlled by adjusting the longitudinal position of the sheath with respect to the catheter; inserting said catheter assembly into a patient's cardiovascular system; positioning the sheath of the assembly at a selected location to cause the distal end of the catheter to assume one curve with the catheter in that curve being adapted to perform a first angiographic catheterization procedure; while maintaining the catheter in said first curve configuration, performing said first catheterization procedure; thereafter shifting the position of the sheath with respect to the catheter thereby to change the curve at the distal end of the catheter to a second configuration adapted to perform a second angiographic catheterization procedure; while maintaining said catheter in said second curve configuration, performing said second catheterization procedure.
Claim 20
Independent Claim
53 words
A method as defined in claim 17wherein said sheath and catheter define an annular lumen extending along the length of the sheath, the sheath having a proximal fitting for connection of a fluid device thereto, the procedure further comprising causing fluid to flow through the annular space defined the sheath and the catheter.
Claim 21
Dependent Claim
62 words
A method as defined in claim 17 wherein said sheath and catheter define an annular lumen extending along the length of the sheath, the sheath having a proximal fitting for connection of a fluid device thereto, the procedure further comprising measuring the fluid pressure in the patient's vasculature by connecting a fluid pressure measuring device to the proximal fitting of the sheath.
Claim 22
Dependent Claim
20 words
A method as defined in claim 17 wherein said catheter is directed to the entry to the patient's coronary arteries.
Claim 23
Dependent Claim
75 words
A method as defined in claim 17 further comprising: advancing the catheter system to the aortic valve and locating the distal end of the catheter on one side of the aortic valve and the distal end of the sheath on the other side of the valve; measuring the pressure distally and proximally of the aortic valve respectfully through the catheter and the sheath, thereby providing an indication of the pressure differential across the aortic valve.
References Cited (Backward Citations)
US3856009A
Cited
US4033331A
Cited
US4136681A
Cited
US4169464A
Cited
US4563181A
Cited
US4694238A
Cited
US4828550A
Cited
US4738667A
Cited
EP0278937A2
Cited
US4795434A
Cited
US4810244A
Cited
US4810244B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |