Patent US2755381A successfully refreshed from Google Patents.
US4915693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressurized fluid dispenser
Assignee: Baxter International Inc
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Filing: 1988-09-02
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Granted: 1990-04-10
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Expires: 2008-09-02
Abstract
Abstract Disclosed is an elastomeric bladder infusion pump which may be used for delivering a pharmaceutically active material to a patient at a substantially constant flow rate. A unitary internal stress member or mandrel is disposed within the bladder, prestressing the bladder in both the axial and radial dimensions.
Inventors
- 👤 Stephen R. Hessel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:47
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/142; A61M5/145; A61M5/148; A61M5/152; Y; Y10; Y10S; Y10S128/00; Y10S128/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
169 words
An infusion pump for delivering a quantity of fluid material at a substantially constant flow rate, comprising: an elongate elastomeric bladder having a central lumen and at least one open end; an elongate stress member means of substantially constant diameter extending continuously throughout and along the length of and within the lumen of the bladder, and having a fluid-tight seal to the bladder; a filling port in the stress member means in communication with the lumen of the bladder through a first lumen extending through the stress member means; and an exit port in the stress member means in communication with the lumen of the bladder through a second lumen extending through the stress member, the stress member means acting to minimize pressure surging at the terminal end of the deflation cycle, by having a diameter that is from 1.1 to 2.0 times the unstressed internal diameter of the bladder, an axial length of the bladder at the fluid-tight seal which is substantially unchanged upon filling the fluid material.
Claim 2
Dependent Claim
169 words
An infusion pump for delivering a quantity of fluid material at a substantially constant flow rate, comprising: an elongate elastomeric bladder having a central lumen and at least one open end; an elongate stress member means of substantially constant diameter extending continuously throughout and along the length of and within the lumen of the bladder, and having a fluid-tight seal to the bladder; a filling port in the stress member means in communication with the lumen of the bladder through a first lumen extending through the stress member means; and an exit port in the stress member means in communication with the lumen of the bladder through a second lumen extending through the stress member, the stress member means acting to minimize pressure surging at the terminal end of the deflation cycle, by having a diameter that is from 1.1 to 2.0 times the unstressed internal diameter of the bladder, an axial length of the bladder at the fluid-tight seal which is substantially unchanged upon filling the fluid material.
Claim 3
Dependent Claim
153 words
An infusion pump for delivering a quantity of fluid material at a substantially constant flow rate, comprising: an elongate elastomeric bladder having a central lumen and at least one open end; an elongate stress member extending of substantially constant diameter continuously throughout and along the length of and within the lumen of the bladder, and having a fluid-tight seal with the bladder, and acting to provide a substantially constant fluid pressure within said bladder; and at least one flow path in the stress member in fluid communication with the central lumen of the bladder, said stress member having a diameter that is from 1.1 to 2.0 times the internal relaxed diameter of the bladder, and the length of the stress member is from 1.1 to 2.5 times the internal relaxed length of the bladder, and the axial length of the bladder at the fluid-tight seal is substantially unchanged upon filling the fluid material.
Claim 4
Dependent Claim
153 words
An infusion pump for delivering a quantity of fluid material at a substantially constant flow rate, comprising: an elongate elastomeric bladder having a central lumen and at least one open end; an elongate stress member extending of substantially constant diameter continuously throughout and along the length of and within the lumen of the bladder, and having a fluid-tight seal with the bladder, and acting to provide a substantially constant fluid pressure within said bladder; and at least one flow path in the stress member in fluid communication with the central lumen of the bladder, said stress member having a diameter that is from 1.1 to 2.0 times the internal relaxed diameter of the bladder, and the length of the stress member is from 1.1 to 2.5 times the internal relaxed length of the bladder, and the axial length of the bladder at the fluid-tight seal is substantially unchanged upon filling the fluid material.
Claim 5
Dependent Claim
16 words
An infusion pump as in claim 2, further comprising a flow regulator in the flow path.
Claim 6
Dependent Claim
165 words
An infusion pump for delivering a quantity of fluid material at a substantially constant flow rate, comprising: an elongate elastomeric bladder having a central lumen and at least one open end; an elongate stress member extending throughout the length of and within the lumen of the bladder and having a fluid-tight seal to the bladder; a filling port on the stress member in communication with the lumen of the bladder by way of a first lumen extending through the stress member; an exit port on the stress member in communication with the lumen of the bladder by way of a second lumen extending through the stress member and non-intersecting the first lumen; and a flow regulating means disposed upstream of the exit port wherein the stress member prestresses the bladder in both the axial and radial directions prior to introduction into the bladder of any of the fluid material, and the axial length of the bladder is essentially unchanged upon filling with the fluid material.
Claim 7
Dependent Claim
165 words
An infusion pump for delivering a quantity of fluid material at a substantially constant flow rate, comprising: an elongate elastomeric bladder having a central lumen and at least one open end; an elongate stress member extending throughout the length of and within the lumen of the bladder and having a fluid-tight seal to the bladder; a filling port on the stress member in communication with the lumen of the bladder by way of a first lumen extending through the stress member; an exit port on the stress member in communication with the lumen of the bladder by way of a second lumen extending through the stress member and non-intersecting the first lumen; and a flow regulating means disposed upstream of the exit port wherein the stress member prestresses the bladder in both the axial and radial directions prior to introduction into the bladder of any of the fluid material, and the axial length of the bladder is essentially unchanged upon filling with the fluid material.
Claim 8
Dependent Claim
35 words
An infusion pump for delivering a quantity of fluid material at a substantially constant flow rate as in claim 4, wherein the radial prestressing is within the range of from about 10% to about 100%.
References Cited (Backward Citations)
US3361303A
Cited
US3469578A
Cited
US3468308A
Cited
US3412906A
Cited
US3506005A
Cited
US3698595A
Cited
US3677444A
Cited
US3738538A
Cited
US3672543A
Cited
US3791557A
Cited
US3796356A
Cited
US3876115A
Cited
US3961725A
Cited
US3981415A
Cited
US4318400A
Cited
US4386929A
Cited
US4419096A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-09 | 1993-10-09 | 1994-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-09 | 1997-10-09 | 1998-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-09 | 2001-10-09 | 2002-04-10 | $7700.00 | Window Closed / Lapsed |