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US4941473A
Expired / Lapsed
US
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Guide for mechanical guiding of a catheter in connection with cardio and vascular examination
Assignee: St Jude Medical Systems AB
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Filing: 1987-07-31
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Granted: 1990-07-17
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Expires: 2007-07-31
Abstract
Abstract A guidewire for guiding a catheter is provided including a pressure sensor at the distal end of the guidewire and a ventilation passage for connecting the pressure sensor to ambient pressure.
Inventors
- 👤 Lars Tenerz
- 👤 Bertil Hook
- 👤 Thomas Engstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:47
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/68; A61B5/6846; A61B5/6847; A61B5/6851; A61B5/02; A61B5/021; A61B5/0215; A61M; A61M25/00; A61M25/01; A61M25/09; A61M25/09016; A61M25/09033; A61M2025/09175
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
92 words
A guide wire having a distal end and proximal end for mechanically guiding a medical probe, comprising: (a) a miniaturized pressure sensor disposed at the distal end of the guide wire; (b) an air ventilation passage connecting the pressure sensor to a source of reference pressure; (c) a sheath formed of at least a first part adjacent the proximal end and a second part adjacent the pressure sensor, the sheath determining the torsional stiffness of the guide wire; (d) the first part being substantially inflexible and the second part being more flexible.
Claim 2
Dependent Claim
92 words
A guide wire having a distal end and proximal end for mechanically guiding a medical probe, comprising: (a) a miniaturized pressure sensor disposed at the distal end of the guide wire; (b) an air ventilation passage connecting the pressure sensor to a source of reference pressure; (c) a sheath formed of at least a first part adjacent the proximal end and a second part adjacent the pressure sensor, the sheath determining the torsional stiffness of the guide wire; (d) the first part being substantially inflexible and the second part being more flexible.
Claim 3
Dependent Claim
30 words
Guide wire as claimed in claim 1, wherein the sheath includes at least one section of elongated metal elements wound counter to each other for achieving a desired torsional stiffness.
Claim 4
Dependent Claim
26 words
Guide wire as claimed in claim 2, wherein the sheath includes in at least one section a metal tube in which an optical fibre is disposed.
Claim 5
Dependent Claim
28 words
Guide wire as claimed in claim 3, wherein the ventilation passage is formed by a space between the optical fibre and an inner wall of the metal tube.
Claim 6
Dependent Claim
31 words
Guide wire as claimed in claim 3, wherein an optical fibre extends in the guide wire and wherein the pressure signals from the sensor are transmitted optically by the optical fibre.
Claim 7
Dependent Claim
26 words
Guide wire as claimed in claim 1, wherein the sheath includes in at least one section a metal tube in which an optical fibre is disposed.
Claim 8
Dependent Claim
28 words
Guide wire as claimed in claim 6, wherein said ventilation passage is formed by a space between the optical fibre and an inner wall of the metal tube.
Claim 9
Dependent Claim
42 words
Guide wire as claimed in claim 6, further comprising at least one optical connection means placed at the proximal end of the guide wire, said connection means enabling the optical fibre to be connected with small light losses to another optical fibre.
Claim 10
Dependent Claim
22 words
Guide wire as claimed in claim 6, wherein at least a portion of the sheath is coated with at least one polymer.
Claim 11
Dependent Claim
22 words
Guide wire as claimed in claim 6, wherein at least a portion of the sheath is coated with at least one polymer.
Claim 12
Dependent Claim
20 words
Guide wire as claimed in claim 1, wherein the sheath contains a chemical compound containing an oxide of a metal.
Claim 13
Dependent Claim
20 words
The guide wire of claim 11, wherein said heavy metal is selected from the group consisting of bismuth and tungsten.
Claim 14
Dependent Claim
24 words
Guide wire as claimed in claim 1, wherein the sheath includes a tube, junction and spiral and is made from one piece of metal.
Claim 15
Dependent Claim
31 words
Guide wire as claimed in claim 1, wherein an optical fibre extends in the guide wire and wherein the pressure signals from the sensor are transmitted optically by the optical fibre.
Claim 16
Dependent Claim
22 words
Guide wire as claimed in claim 1, wherein the pressure sensor is mechanically connected to at least a portion of the sheath.
Claim 17
Dependent Claim
15 words
The guide wire of claim 15, wherein said pressure sensor is mechanically connected by brazing.
Claim 18
Dependent Claim
15 words
The guide wire of claim 15, wherein said pressure sensor is mechanically connected by welding.
Claim 19
Dependent Claim
23 words
Guide wire as claimed in claim 1, wherein a thin-walled tube is mounted on the sheath surface of the guide wire by shrinking.
Claim 20
Dependent Claim
32 words
Guide wire as claimed in claim 1, wherein the sheath is formed of an alloy of the metals iron, chromium and nickel, and at least one section of the sheath is hardened.
Claim 21
Dependent Claim
23 words
Guide wire as claimed in claim 1, wherein a thin-walled tube is mounted on the sheath surface of the guide wire by shrinking.
Claim 22
Dependent Claim
20 words
Guide wire as claimed in claim 1, wherein the sheath contains a chemical compound containing an oxide of a metal.
Claim 23
Dependent Claim
21 words
The guide wire according to claim 21, wherein said heavy metal is selected from the group consisting of bismuth and tungsten.
Claim 24
Dependent Claim
24 words
Guide wire as claimed in claim 1, wherein the sheath includes a tube, junction and spiral and is made from one piece of metal.
Claim 25
Dependent Claim
32 words
Guide wire as claimed in claim 1, wherein the sheath is formed of an alloy of the metals iron, chromium and nickel, and at least one section of the sheath is hardened.
Claim 26
Dependent Claim
23 words
The guide wire of claim 1 wherein the flexibility of the sheath changes abruptly at a juncture between the first and second parts.
Claim 27
Dependent Claim
30 words
The guide wire of claim 1 wherein the flexibility of the sheath increases gradually in the direction of the distal end in a region between the first and second parts.
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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) | 1993-07-16 | 1994-01-15 | 1994-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-16 | 1998-01-15 | 1998-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-16 | 2002-01-15 | 2002-07-17 | $7700.00 | Window Closed / Lapsed |