Patent US4945898A successfully refreshed from Google Patents.
US4945898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply
Assignee: Diasonics Inc
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Filing: 1989-07-12
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Granted: 1990-08-07
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Expires: 2009-07-12
Abstract
Abstract A pulsed power supply for providing power to a piezoelectric crystal. The power supply provides power to the piezoelectric crystal causing contraction of the crystal. Upon reaching a predetermined degree of contraction, the electrical voltage form the power supply is removed from the piezoelectric crystal by creating a short-circuit between the power supply and the crystal. Removal of electrical voltage from the crystal causes the immediate expansion of the crystal and a resulting energy wave.
Inventors
- 👤 James W. Pell
- 👤 Richard E. Spielmaker
- 👤 Arthur W. Zikorus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:15
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/22; A61B17/225; B; B06; B06B; B06B1/00; B06B1/02; B06B1/0207; B06B1/0215; G; G10; G10K; G10K15/00; G10K15/04; G10K15/043; A61B17/2255; B06B2201/00; B06B2201/50; B06B2201/55; B06B2201/70; B06B2201/76
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
In a lithotripsy system having a piezoelectric means for generating an energy beam upon expansion and a focussing means for focussing said energy beam on a calculus in a patient, said focussing means attached to said piezoelectric means, the improvement comprising a means for supplying power to said piezoelectric means, said power supply means comprising: a trigger pulse generating means for generating a trigger pulse; voltage supply means, coupled to said trigger pulse generating means, for generating a ramped output voltage upon receiving said trigger pulse; said piezoelectric means coupled in parallel with said voltage supply means and contracting as said ramped output voltage is received; and a spark gap tube means, coupled in parallel with said voltage supply means, for creating a short circuit when said ramped output voltage reaches a predetermined level thereby rapidly decreasing the voltage across said piezoelectric means causing said piezoelectric means to expand thereby generating said energy beam.
Claim 2
Dependent Claim
154 words
In a lithotripsy system having a piezoelectric means for generating an energy beam upon expansion and a focussing means for focussing said energy beam on a calculus in a patient, said focussing means attached to said piezoelectric means, the improvement comprising a means for supplying power to said piezoelectric means, said power supply means comprising: a trigger pulse generating means for generating a trigger pulse; voltage supply means, coupled to said trigger pulse generating means, for generating a ramped output voltage upon receiving said trigger pulse; said piezoelectric means coupled in parallel with said voltage supply means and contracting as said ramped output voltage is received; and a spark gap tube means, coupled in parallel with said voltage supply means, for creating a short circuit when said ramped output voltage reaches a predetermined level thereby rapidly decreasing the voltage across said piezoelectric means causing said piezoelectric means to expand thereby generating said energy beam.
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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) | 1993-08-06 | 1994-02-05 | 1994-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-06 | 1998-02-05 | 1998-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-06 | 2002-02-05 | 2002-08-07 | $7700.00 | Window Closed / Lapsed |