US4509947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-cleaning drug delivery catheter and storage bladder
Assignee: Medtronic Inc
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Filing: 1982-08-02
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Granted: 1985-04-09
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Expires: 2002-08-02
Abstract
Abstract A drug delivery catheter and storage bladder adapted for use in an implantable drug delivery system. The catheter and bladder are provided with piezoelectric layers adapted to be responsively coupled to a source of ultrasonic electrical signals. When so coupled, vibration of the piezoelectric layer dislodges any accumulation of crystallized drugs within the catheter and bladder.
Inventors
- 👤 Gary A. Lattin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:20
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/142; A61M5/14244; A61M5/14276; H; H10; H10N; H10N30/00; H10N30/60; A61M25/00; A61M2025/0019; Y; Y10; Y10S; Y10S310/00; Y10S310/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A drug delivery catheter comprising a tubular catheter member having an interior surface; and piezoelectric means for cleaning the interior surface of said chamber by applying ultrasonic vibrations to said tubular catheter member; wherein said piezoelectric means comprises a layer of piezoelectric material applied to the tubular catheter member, a first metallized layer intermediate to said tubular catheter member and said layer of piezoelectric material and a second metallized layer external to said layer of piezoelectric material, and means whereby said piezoelectric material may be coupled to a source of ultrasonic electrical signals.
Claim 2
Dependent Claim
93 words
A drug delivery catheter comprising a tubular catheter member having an interior surface; and piezoelectric means for cleaning the interior surface of said chamber by applying ultrasonic vibrations to said tubular catheter member; wherein said piezoelectric means comprises a layer of piezoelectric material applied to the tubular catheter member, a first metallized layer intermediate to said tubular catheter member and said layer of piezoelectric material and a second metallized layer external to said layer of piezoelectric material, and means whereby said piezoelectric material may be coupled to a source of ultrasonic electrical signals.
References Cited (Backward Citations)
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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) | 1988-04-08 | 1988-10-08 | 1989-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-08 | 1992-10-08 | 1993-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-08 | 1996-10-08 | 1997-04-09 | $7700.00 | Window Closed / Lapsed |