US5606974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catheter having ultrasonic device
Assignee: Cardiac Pacemakers Inc
•
Filing: 1995-05-02
•
Granted: 1997-03-04
•
Expires: 2015-05-02
Abstract
Abstract A catheter includes a piezoelectric transducer mounted to the distal end of a catheter. In one embodiment, the piezoelectric transducer has the shape of a cylinder and in another embodiment, a convex shape with a mounting flange. In the cylindrical shape, a plurality of surface mounted temperature sensors are disposed within the piezoelectric transducer. The sensors are electrically insulated and a sealing technique prevents the leakage of body fluids from penetrating the interior of the catheter through the sensor bores. The cylindrical transducer is supported on mounting members so that it is accurately mounted and sealed while at the same time, the material used does not significantly dampen the transducer. The convex shape includes a temperature sensor at its tip.
Inventors
- 👤 Thomas M. Castellano
- 👤 Robert C. Hayzelden
- 👤 Tracy D. Maahs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:10
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/22; A61B17/22004; A61B17/22012; A61B17/2202; A61B2017/00017; A61B2017/00022; A61B2017/00084; A61B2017/00092; A61B17/00234; A61B2017/00238; A61B2017/00243
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
114 words
A catheter comprising: an elongated catheter tube having proximal and distal ends and an inner lumen extending the length of the tube; an ultrasonic transducer mounted at the distal end of the catheter tube, the transducer having a wall with inner and outer surfaces, the transducer having a plurality of sensor holes formed completely through the wall of the transducer; a temperature sensing device disposed within each sensor hole in the wall of the transducer; and an adhesive disposed over each sensor hole on the outer surface of the transducer to seal the hole and the respective temperature sensing device thereby sealing the temperature sensing device from contact with fluids exterior to the transducer.
Claim 2
Dependent Claim
114 words
A catheter comprising: an elongated catheter tube having proximal and distal ends and an inner lumen extending the length of the tube; an ultrasonic transducer mounted at the distal end of the catheter tube, the transducer having a wall with inner and outer surfaces, the transducer having a plurality of sensor holes formed completely through the wall of the transducer; a temperature sensing device disposed within each sensor hole in the wall of the transducer; and an adhesive disposed over each sensor hole on the outer surface of the transducer to seal the hole and the respective temperature sensing device thereby sealing the temperature sensing device from contact with fluids exterior to the transducer.
Claim 3
Dependent Claim
104 words
The catheter of claim 1 further comprising a flexible sheath disposed in and in contact with the sensor hole in the wall of the transducer wherein; the temperature sensing device is disposed within the sheath in the wall of the transducer; and the adhesive is disposed over the sensor hole on the outer surface of the transducer to seal the hole and disposed in contact with the interior of the sheath in contact with the temperature sensing device affixing the temperature sensing device and the sheath in the sensor hole and sealing the temperature sensing device from contact with fluids exterior to the sheath.
Claim 4
Dependent Claim
59 words
The catheter of claim 2 wherein: the temperature sensing device comprises an electrical lead; the flexible sheath has a length selected to be longer than the thickness of the wall of the transducer with the sheath disposed so that the extra length is disposed inside the transducer to provide a strain relief to the leads of the sensing device.
Claim 5
Dependent Claim
24 words
The catheter of claim 1 wherein the temperature sensing devices each comprises a thermocouple located substantially level with the outer surface of the transducer.
Claim 6
Dependent Claim
38 words
The catheter of claim 1 further comprising a matching layer disposed over the outer surface of the transducer, the properties of the matching layer selected to better match the ultrasonic transducer to tissue to which it may contact.
Claim 7
Dependent Claim
42 words
The catheter of claim 1 further comprising: electrodes formed on the outer and inner surfaces of the transducer to conduct electrical signals to the transducer for excitation of the transducer; and electrode leads for conducting electrical signals to and from the electrodes.
Claim 8
Dependent Claim
54 words
The catheter of claim 1 wherein: the catheter further comprises an internal mounting member; the ultrasonic transducer is mounted to the internal mounting member by an elastomeric member that positions the transducer properly in relation to the catheter and isolates the transducer mechanically from the catheter so that transducer vibrations are not significantly damped.
Claim 9
Dependent Claim
50 words
The catheter of claim 7 wherein: the transducer has a hollow, cylindrical form; the mounting member comprises two elastomeric members spaced apart from each other to properly align the transducer in the catheter and to isolate the transducer mechanically from the catheter so that transducer vibrations are not significantly damped.
Claim 10
Dependent Claim
79 words
The catheter of claim 8 further comprising: an end member and a shaft member; a first spacing member disposed between the transducer and the shaft member; and a second spacing member disposed between the transducer and the end member; wherein the first and second spacing members comprise a sealing and non-damping material that seals the interior of the catheter from external fluids and also isolates the transducer mechanically from the catheter so that transducer vibrations are not significantly damped.
Claim 11
Dependent Claim
20 words
The catheter of claim 1 wherein the wall of the cylindrical transducer comprises three sensor holes located 120 degrees apart.
Claim 12
Dependent Claim
125 words
A catheter comprising: an elongated catheter tube having proximal and distal ends and an inner lumen extending the length of the tube; a hollow, cylindrical piezoelectric transducer mounted at the distal end of the catheter tube, the transducer having a wall and inner and outer surfaces; an internal mounting member; one or more sensor holes formed completely through the wall of the transducer; a temperature sensing device disposed within one or more of the sensor holes in the wall of the transducer; and wherein the cylindrical ultrasonic transducer is mounted to the internal mounting member by an elastomeric member that positions the transducer properly in relation to the catheter and isolates the transducer mechanically from the catheter so that transducer vibrations are not significantly damped.
Claim 13
Dependent Claim
125 words
A catheter comprising: an elongated catheter tube having proximal and distal ends and an inner lumen extending the length of the tube; a hollow, cylindrical piezoelectric transducer mounted at the distal end of the catheter tube, the transducer having a wall and inner and outer surfaces; an internal mounting member; one or more sensor holes formed completely through the wall of the transducer; a temperature sensing device disposed within one or more of the sensor holes in the wall of the transducer; and wherein the cylindrical ultrasonic transducer is mounted to the internal mounting member by an elastomeric member that positions the transducer properly in relation to the catheter and isolates the transducer mechanically from the catheter so that transducer vibrations are not significantly damped.
Claim 14
Dependent Claim
43 words
The catheter of claim 11 wherein: the mounting member comprises two elastomeric members spaced apart from each other to properly align the transducer in the catheter and to isolate the transducer mechanically from the catheter so that transducer vibrations are not significantly damped.
Claim 15
Dependent Claim
79 words
The catheter of claim 11 further comprising: an end member and a shaft member; a first spacing member disposed between the transducer and the shaft member; and a second spacing member disposed between the transducer and the end member; wherein the first and second spacing members comprise a sealing and non-damping material that seals the interior of the catheter from external fluids and also isolates the transducer mechanically from the catheter so that transducer vibrations are not significantly damped.
Claim 16
Dependent Claim
67 words
The catheter of claim 11 further comprising: an electrode formed on the outer surface of the transducer to conduct electrical signals to the transducer for excitation of the transducer; an electrode lead for conducting electrical signals to and from the electrode; wherein the electrode is selected and mounted to the transducer to receive electrical signals from outside the transducer and conduct those signals to the electrode lead.
Claim 17
Dependent Claim
46 words
The catheter of claim 11 further comprising: a matching layer disposed over the outer surface of the transducer and over each sensor hole and sensing device, the properties of the matching layer selected to better match the ultrasonic transducer to tissue to which it may contact.
Claim 18
Dependent Claim
47 words
The catheter of claim 11 further comprising: a thermally conductive adhesive disposed over each sensor hole on the outer surface of the transducer to seal the hole and the respective temperature sensing device thereby sealing the temperature sensing device from contact with fluids exterior to the transducer.
Claim 19
Dependent Claim
92 words
A catheter comprising: an elongated catheter tube having proximal and distal ends and an inner lumen extending the length of the tube; a mounting member disposed in the distal end; and a hollow, piezoelectric transducer having a convex shape with an integral mounting flange, the transducer having a wall and inner and outer surfaces; wherein the integral mounting flange of the transducer is mounted at the distal end of the catheter tube on the mounting member distal to the catheter tube so that the transducer forms the distal tip of the catheter.
Claim 20
Dependent Claim
92 words
A catheter comprising: an elongated catheter tube having proximal and distal ends and an inner lumen extending the length of the tube; a mounting member disposed in the distal end; and a hollow, piezoelectric transducer having a convex shape with an integral mounting flange, the transducer having a wall and inner and outer surfaces; wherein the integral mounting flange of the transducer is mounted at the distal end of the catheter tube on the mounting member distal to the catheter tube so that the transducer forms the distal tip of the catheter.
Claim 21
Dependent Claim
54 words
The catheter of claim 17 wherein the ultrasonic transducer is mounted to the mounting member by an elastomeric member that positions the transducer properly in relation to the catheter, seals the catheter from the entry of external fluids, and isolates the transducer mechanically from the catheter so that transducer vibrations are not significantly damped.
Claim 22
Dependent Claim
67 words
The catheter of claim 18 further comprising: an electrode formed on the outer surface of the transducer to conduct electrical signals to the transducer for excitation of the transducer; an electrode lead for conducting electrical signals to and from the electrode; wherein the electrode is selected and mounted to the transducer to receive electrical signals from outside the transducer and conduct those signals to the electrode lead.
Claim 23
Dependent Claim
74 words
The catheter of claim 19 further comprising: a sensor hole formed completely through the wall of the transducer; a temperature sensing device disposed within the sensor hole in the wall of the transducer; and a thermally conductive adhesive disposed over the sensor hole on the outer surface of the transducer to seal the hole and the respective temperature sensing device thereby sealing the temperature sensing device from contact with fluids exterior to the transducer.
Claim 24
Dependent Claim
101 words
A catheter comprising: an elongated catheter tube having proximal and distal ends and an internal mounting member at the distal end of the tube; a hollow, cylindrical piezoelectric transducer mounted axially around the internal mounting member of the catheter tube, the transducer having a wall with inner and outer surfaces; an elastomeric member positioned between the internal mounting member of the catheter tube and the inner surface of the wall of the transducer, said elastomeric member positioning the transducer properly in relation to the catheter and isolating the transducer mechanically from the catheter so that transducer vibrations are not significantly damped.
Claim 25
Dependent Claim
101 words
A catheter comprising: an elongated catheter tube having proximal and distal ends and an internal mounting member at the distal end of the tube; a hollow, cylindrical piezoelectric transducer mounted axially around the internal mounting member of the catheter tube, the transducer having a wall with inner and outer surfaces; an elastomeric member positioned between the internal mounting member of the catheter tube and the inner surface of the wall of the transducer, said elastomeric member positioning the transducer properly in relation to the catheter and isolating the transducer mechanically from the catheter so that transducer vibrations are not significantly damped.
Claim 26
Dependent Claim
15 words
The catheter of claim 21, wherein the elastomeric member comprises one or more elastomeric O-rings.
Claim 27
Dependent Claim
30 words
The catheter of claim 22, wherein the catheter tube further comprises: one or more retainer grooves in the internal mounting member; wherein the O-rings are mounted in said retainer grooves.
Claim 28
Dependent Claim
21 words
The catheter of claim 21, further comprising: one or more sealant beads positioned between the piezoelectric transducer and the catheter tube.
References Cited (Backward Citations)
US3075515A
Cited
US3232794A
Cited
US3359974A
Cited
US3336804A
Cited
US3438253A
Cited
US3595079A
Cited
US3938502A
Cited
US3893058A
Cited
US4075036A
Cited
US4253469A
Cited
US4411266A
Cited
US4745928A
Cited
US4706681A
Cited
US4841981A
Cited
US4749415A
Cited
US4869248A
Cited
US4901734A
Cited
US5228176A
Cited
US5070882A
Cited
US4960109A
Cited
US4936281A
Cited
US5002059A
Cited
US5176141A
Cited
US5269291A
Cited
US5304115A
Cited
US5312328A
Cited
US5271410A
Cited
US5174299A
Cited
WO1993008755A1
Cited
US5363853A
Cited
US5423808A
Cited
US5295484A
Cited
US5385544A
Cited
US5391197A
Cited
US5405346A
Cited
US5385148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-03-03 | 2000-09-02 | 2001-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-03 | 2004-09-02 | 2005-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-03 | 2008-09-02 | 2009-03-04 | $7700.00 | Window Closed / Lapsed |