US5070882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Probe tip ultrasonic transducers and method of manufacture
Assignee: Pacesetter Inc
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Filing: 1989-08-22
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Granted: 1991-12-10
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Expires: 2009-08-22
Abstract
Abstract An improved ultrasonic transducer for a catheter tip has a thin strip of piezoelectric polymer film formed into a spiral ring and adhesively mounted on the support structure near the catheter tip. Electrical connection between the back face of the film and the support structure negative electrode is via capacitive coupling. Connection to the front face of the film is via a wire connected to the positive electrode of the catheter. A further embodiment suitable for a needle transducer is formed by coating the tip with a solution of PVDF co-polymer to form the actual transducer.
Inventors
- 👤 Tuan Bui
- 👤 Saad Nasr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:34
CPC Classifications
A; A61; A61B; A61B8/00; A61B8/12; B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0688; A61B17/00; A61B2017/00831; A61B2017/00902; A61B2017/00924; A61B90/00; A61B90/39; A61B2090/3925; A61B2090/3929
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
75 words
A biological probe comprising a coaxial stylet having an inner and an outer coaxial conductor, said inner conductor having a substantially constant cross sectional area protruding axially beyond said outer conductor and spaced therefrom by a coaxial insulator, a crystallized piezoelectric polymer film covering the surface of said protruding portion of said inner conductor and capacitively coupled to said inner conductor, a front electrode in electrical contact with said polymer and said outer coaxial conductor.
Claim 2
Dependent Claim
75 words
A biological probe comprising a coaxial stylet having an inner and an outer coaxial conductor, said inner conductor having a substantially constant cross sectional area protruding axially beyond said outer conductor and spaced therefrom by a coaxial insulator, a crystallized piezoelectric polymer film covering the surface of said protruding portion of said inner conductor and capacitively coupled to said inner conductor, a front electrode in electrical contact with said polymer and said outer coaxial conductor.
Claim 3
Dependent Claim
19 words
The biological probe of claim 1 wherein said polymer is crystallized from a solution of VDF and TrFe copolymer.
Claim 4
Dependent Claim
81 words
A biological probe comprising catheter tip having a substantially constant cross sectional area and having inner and outer coaxial conductors, said catheter tip in electrical contact with said inner conductor and protruding axially beyond said outer conductor and spaced therefrom by a coaxial insulator, a crystallized piezoelectric polymer film covering the protruding portion of the surface of said catheter tip and capacitively coupled to said inner conductor, a front electrode in electrical contact with said polymer and said outer coaxial conductor.
Claim 5
Dependent Claim
81 words
A biological probe comprising catheter tip having a substantially constant cross sectional area and having inner and outer coaxial conductors, said catheter tip in electrical contact with said inner conductor and protruding axially beyond said outer conductor and spaced therefrom by a coaxial insulator, a crystallized piezoelectric polymer film covering the protruding portion of the surface of said catheter tip and capacitively coupled to said inner conductor, a front electrode in electrical contact with said polymer and said outer coaxial conductor.
Claim 6
Dependent Claim
19 words
The biological probe of claim 3 wherein said polymer is crystallized from a solution of VDF and TrFe copolymer.
References Cited (Backward Citations)
US3938502A
Cited
US3942530A
Cited
US4407294A
Cited
US4582067A
Cited
US4555593A
Cited
US4577132A
Cited
US4697595A
Cited
US4651310A
Cited
US4728844A
Cited
US4794931A
Cited
US5002058A
Cited
US4771788A
Cited
US4920967A
Cited
US4991588A
Cited
US4887606A
Cited
US4802487A
Cited
US4825116A
Cited
US4951677A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-09 | 1995-06-10 | 1995-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-09 | 1999-06-10 | 1999-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-09 | 2003-06-10 | 2003-12-10 | $7700.00 | Window Closed / Lapsed |