US4945898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply
Assignee: Diasonics Inc
•
Filing: 1989-07-12
•
Granted: 1990-08-07
•
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 04:04
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.
References Cited (Backward Citations)
US2488290A
Cited
US3129366A
Cited
US3942531A
Cited
US3958559A
Cited
EP0018614B1
Cited
US4311147A
Cited
US4376255A
Cited
US4315514A
Cited
US4586512A
Cited
US4539989A
Cited
US4570634A
Cited
US4622969A
Cited
US4674505A
Cited
US4617931A
Cited
US4617931B1
Cited
US4658828A
Cited
US4655205A
Cited
US4669483A
Cited
US4618796A
Cited
US4664111A
Cited
US4718421A
Cited
US4771787A
Cited
US4749897A
Cited
US4803995A
Cited
US4767959A
Cited
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 |