Patent US5997488A successfully refreshed from Google Patents.
US5997488A
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Cardiopulmonary resuscitation system with centrifugal compression pump
Assignee: Zoll Circulation Inc
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Filing: 1998-04-02
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Granted: 1999-12-07
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Expires: 2018-04-02
Abstract
Abstract A blower pressure source has been integrated into a vest cardiopulmonary resuscitation (CPR) system. The vest includes a bladder that cyclically inflates and deflates to provide automatic CPR to a patient in cardiac arrest or needing circulatory assistance to a patient with a beating but weakened heart. The blower continuously provides air at relatively low pressure to inflate a bladder in the vest. The maximum pressure of the blower corresponds to the desired peak vest pressure. A relatively simple valve, solenoid and timing controller is used to apply the blower air in cycles to inflate the bladder.
Inventors
- 👤 Mark Gelfand
- 👤 Neil S. Rothman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:23
CPC Classifications
A; A61; A61H; A61H9/00; A61H9/005; A61H9/0078; A61H31/00; A61H31/004; A61H31/006; A61H31/02; A61H2031/025; A61H2201/00; A61H2201/01; A61H2201/0103; A61H2201/12; A61H2201/1238; A61H2201/16; A61H2201/1602; A61H2201/165; A61H2201/50; A61H2201/5007; A61H2201/5058; A61H2201/5071; A61H2230/00; A61H2230/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
54 words
A cardiopulmonary resuscitation or assist system as in claim 1 further comprising a valve coupling the blower to the hose; and a timing controller for periodically switching the valve between a first state of routing the inflation air from the blower to the bladder and a second state of venting air from the bladder.
Claim 2
Dependent Claim
46 words
A cardiopulmonary resuscitation and assist system as in claim 1 wherein the timing controller maintains the valve in the first state for a period of between 300 to 600 milliseconds and maintains the valve in the second state for a period between 500 and 900 milliseconds.
Claim 3
Dependent Claim
43 words
A cardiopulmonary resuscitation and assist system as in claim 1 further including a heartbeat sensor for generating a signal indicative of the heartbeat of the patient, and wherein the timing controller switches the valve to the first state in accordance with the signal.
Claim 4
Dependent Claim
31 words
A cardiopulmonary resuscitation or assist system as in claim 1 wherein the blower outputs the maximum pressure while the valve is in the second state of venting air from the bladder.
Claim 5
Dependent Claim
143 words
A cardiopulmonary resuscitation or assist system comprising: a vest to be fitted around a thorax of a patient, and having a bladder cyclically inflatable to facilitate blood flow in the patient; a pneumatic hose connectable to the vest to provide inflation air to the bladder; a blower coupled to the hose and supplying the inflation air to the hose, said blower having a maximum pressure output for a given operating speed substantially equal to a desired peak pressure of the bladder; a valve in an air path formed between the blower and the vest, wherein at least a portion of the air path is formed by the pneumatic hose; and a timing controller for periodically switching the valve between a first state of routing the inflation air from the blower to the bladder and a second state of venting air from the bladder.
Claim 6
Dependent Claim
143 words
A cardiopulmonary resuscitation or assist system comprising: a vest to be fitted around a thorax of a patient, and having a bladder cyclically inflatable to facilitate blood flow in the patient; a pneumatic hose connectable to the vest to provide inflation air to the bladder; a blower coupled to the hose and supplying the inflation air to the hose, said blower having a maximum pressure output for a given operating speed substantially equal to a desired peak pressure of the bladder; a valve in an air path formed between the blower and the vest, wherein at least a portion of the air path is formed by the pneumatic hose; and a timing controller for periodically switching the valve between a first state of routing the inflation air from the blower to the bladder and a second state of venting air from the bladder.
Claim 7
Dependent Claim
22 words
A cardiopulmonary resuscitation or assist system as in claim 1 wherein the blower operates continuously while the vest cyclically inflates and deflates.
Claim 8
Dependent Claim
29 words
A cardiopulmonary resuscitation or assist system as in claim 1 wherein said blower operates at the maximum pressure output after the vest is inflated to the desired peak pressure.
Claim 9
Dependent Claim
17 words
A cardiopulmonary resuscitation or assist system as in claim 1 wherein said blower comprises a centrifugal compressor.
Claim 10
Dependent Claim
25 words
A cardiopulmonary resuscitation or assist system as in claim 1 wherein said blower comprises a centrifugal compressor impeller rotating at a substantially constant operating speed.
Claim 11
Dependent Claim
32 words
A cardiopulmonary resuscitation or assist system as in claim 1 wherein the blower moves a maximum mass flow rate of air into the bladder during an initial inflation period of the bladder.
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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) | 2002-12-06 | 2003-06-07 | 2003-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-12-06 | 2007-06-07 | 2007-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-12-06 | 2011-06-07 | 2011-12-07 | $7700.00 | Window Closed / Lapsed |