US3795242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for applying hydraulic pulsation
Assignee: Intermedics Cardiassist Corp
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Filing: 1972-10-24
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Granted: 1974-03-05
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Expires: 1992-10-24
Abstract
Abstract An improved external pressure circulatory assist device of the type comprising a mechanical means for transmitting a pressure pulse to a liquid-filled blanket wrapped about a patient''s legs, the pulse being in synchronization with the heartbeat of the patient. A novel feature of the invention is that wherein air disturbed by the pulsing mechanism is isolated from the gas atmosphere in the vicinity of the aforesaid blanket and is vented to atmosphere, thereby improving the control of the pressure wave imparted by the circulatory assist action when negative pressure is being used in the immediate environment of the blanket.
Inventors
- 👤 D Lerch
- 👤 J Colman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:10
CPC Classifications
A; A61; A61H; A61H9/00; A61H9/005; A61H9/0078; A61H2230/00; A61H2230/04
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
66 words
In an external circulatory assist apparatus of the type comprising a reciprocating mechanical actuating means adapted to act, in synchronous relationship to the heartbeat of a patient, on a liquid-filled bladder confined in a rigid housing the improvement wherein said mechanical actuating means includes a means for mechanically isolating, and venting from said housing, gas which is displaced by said actuating means during its reciprocal movement.
Claim 2
Dependent Claim
66 words
In an external circulatory assist apparatus of the type comprising a reciprocating mechanical actuating means adapted to act, in synchronous relationship to the heartbeat of a patient, on a liquid-filled bladder confined in a rigid housing the improvement wherein said mechanical actuating means includes a means for mechanically isolating, and venting from said housing, gas which is displaced by said actuating means during its reciprocal movement.
Claim 3
Dependent Claim
43 words
Apparatus as defined in claim 1 wherein said isolation means comprises an enclosed chamber mounted between one side of a reciprocating platen which is acting on said liquid-filled bladder and means to discharge gas from said chamber to outside of said housing chamber.
Claim 4
Dependent Claim
28 words
a lever arm attached between said cam and said mechanical means, said lever arm forming means to raise said mechanical actuating means upon the rotation of said cam.
Claim 5
Dependent Claim
28 words
a lever arm attached between said cam and said mechanical means, said lever arm forming means to raise said mechanical actuating means upon the rotation of said cam.
Claim 6
Dependent Claim
72 words
also pivotally mounted to a mechanical linkage which connects the platen to the other end of said frame, and wherein a linkage-actuating means is mounted at said first end of said frame and formed means to actuate said mechanical linkage mounted at the other end of said frame thereby forming means to distribute stress as tensile stress applied to said frame and to minimize bending stresses on said frame and said housing.
Claim 7
Dependent Claim
72 words
also pivotally mounted to a mechanical linkage which connects the platen to the other end of said frame, and wherein a linkage-actuating means is mounted at said first end of said frame and formed means to actuate said mechanical linkage mounted at the other end of said frame thereby forming means to distribute stress as tensile stress applied to said frame and to minimize bending stresses on said frame and said housing.
Claim 8
Dependent Claim
20 words
venting gas from said space to atmospheric pressure as said device reciprocates to alternately enlarge and decrease said enclosed space.
Claim 9
Dependent Claim
20 words
venting gas from said space to atmospheric pressure as said device reciprocates to alternately enlarge and decrease said enclosed space.
Claim 10
Dependent Claim
25 words
Apparatus as defined in claim 2 wherein said chamber is formed of a bellows extending from said platen to a frame member within said housing.
Claim 11
Dependent Claim
19 words
Apparatus as defined in claim 3 wherein said bellows enclose mechanical linkage means to raise and lower said platen.
Claim 12
Dependent Claim
19 words
Apparatus as defined in claim 2 wherein said chamber encloses mechanical linkage means to raise and lower said platen.
Claim 13
Dependent Claim
28 words
Apparatus as defined in claim 5 wherein said external assist apparatus comprises means to affect subatmospheric pressure in the space within said housing but outside said enclosed chamber.
Claim 14
Dependent Claim
28 words
Apparatus as defined in claim 2 wherein said external assist apparatus comprises means to affect subatmospheric pressure in the space within said housing but outside said enclosed chamber.
Claim 15
Dependent Claim
28 words
Apparatus as defined in claim 3 wherein said external assist apparatus comprises means to affect subatmospheric pressure in the space within said housing but outside said enclosed chamber.
Claim 16
Dependent Claim
51 words
In a process for operating an external circulatory assist apparatus of the type wherein a first side reciprocating mechanical device is utilized to impart a pulsed pressure wave to limbs of a patient which limbs are wrapped in a liquid-containing bladder within a rigid housing, the improvement comprising the steps of
Claim 17
Dependent Claim
51 words
In a process for operating an external circulatory assist apparatus of the type wherein a first side reciprocating mechanical device is utilized to impart a pulsed pressure wave to limbs of a patient which limbs are wrapped in a liquid-containing bladder within a rigid housing, the improvement comprising the steps of
Claim 18
Dependent Claim
17 words
The process of claim 9 wherein a sub-atmospheric pressure is maintained in the environment of said bladder.
Claim 19
Dependent Claim
13 words
Apparatus as defined in claim 2 wherein said reciprocating platen is pivotally mounted
Claim 20
Dependent Claim
117 words
In external pressure circulatory assist apparatus of the type comprising a reciprocating member bearing against a liquid-filled bladder adapted to enclose a patient''s legs, said bladder and reciprocating member being enclosed in a rigid housing, the improvement wherein said reciprocating platen is pivotally mounted on a frame for said actuating means near a first end of said frame and pivotally mounted to a mechanical linkage positioned near the other end of said frame and wherein a piston-actuating cylinder is mounted at said first end of said frame, said cylinder forming means to actuate said mechanical linkage to actuate said reciprocating member and thereby dissipating mechanical stresses along the length of said frame and minimizing bending stresses therealong.
Claim 21
Dependent Claim
117 words
In external pressure circulatory assist apparatus of the type comprising a reciprocating member bearing against a liquid-filled bladder adapted to enclose a patient''s legs, said bladder and reciprocating member being enclosed in a rigid housing, the improvement wherein said reciprocating platen is pivotally mounted on a frame for said actuating means near a first end of said frame and pivotally mounted to a mechanical linkage positioned near the other end of said frame and wherein a piston-actuating cylinder is mounted at said first end of said frame, said cylinder forming means to actuate said mechanical linkage to actuate said reciprocating member and thereby dissipating mechanical stresses along the length of said frame and minimizing bending stresses therealong.
Claim 22
Dependent Claim
11 words
Apparatus as defined in claim 12 wherein said mechanical linkage comprises
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |