US4781688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispensing device for a liquid medicament
Assignee: Individual
•
Filing: 1987-04-06
•
Granted: 1988-11-01
•
Expires: 2007-04-06
Abstract
Abstract A dispensing device for a liquid medicament has a cylindrical support formed on a base which receives an application part fitted into this support and costituting a projection from a cover. An annular reservoir braced against the support is pressed inwardly by a prestressed annular body which can be formed integrally with the reservoir of silicone rubber to drive a liquid medicament through the passage formed in the application part into the body at a constant rate.
Inventors
- 👤 Herwig Thoma
- 👤 Michael Krotlinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:19
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/142; A61M5/145; A61M5/148; A61M5/14244; A61M5/14248; Y; Y10; Y10S; Y10S128/00; Y10S128/12
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
186 words
A device for administering a liquid medicament to a patient at a substantially constant rate, said device comprising: a housing formed with a generally cylindrical support; a flexible collapsible annular reservoir containing said medicament and surrounding said support and braced thereagainst, said reservoir having an inwardly contractible wall which is distended when said reservoir is filled with said medicament; an annular resilient body surrounding said reservoir and in contact therewith in an unstressed state of said body, said body being distended upon filling of said reservoir with said medicament to apply an inward radial force to said wall for pressurizing said medicament in said reservoir; and a passage formed in said housing and connected to said reservoir while having an outlet adapted to communicate with an internal part of said patient, said passage having a cross section and length and structure controlling outflow of said medicament in relation to the annular force applied to said wall and the contraction of said wall under said force during discharge of said medicament that said discharge is effected with a substantially constant pressure over substantially the entire discharge period.
Claim 2
Independent Claim
186 words
A device for administering a liquid medicament to a patient at a substantially constant rate, said device comprising: a housing formed with a generally cylindrical support; a flexible collapsible annular reservoir containing said medicament and surrounding said support and braced thereagainst, said reservoir having an inwardly contractible wall which is distended when said reservoir is filled with said medicament; an annular resilient body surrounding said reservoir and in contact therewith in an unstressed state of said body, said body being distended upon filling of said reservoir with said medicament to apply an inward radial force to said wall for pressurizing said medicament in said reservoir; and a passage formed in said housing and connected to said reservoir while having an outlet adapted to communicate with an internal part of said patient, said passage having a cross section and length and structure controlling outflow of said medicament in relation to the annular force applied to said wall and the contraction of said wall under said force during discharge of said medicament that said discharge is effected with a substantially constant pressure over substantially the entire discharge period.
Claim 3
Dependent Claim
32 words
The device defined in claim 1 wherein said housing is formed with a base provided with said support, and a cover affixed to said base and enclosing said body and said reservoir.
Claim 4
Dependent Claim
32 words
The device defined in claim 2 wherein said cover is formed with said passage on a cylindrical boss which fits into said cylindrical support, said support being hollow to receive said boss.
Claim 5
Dependent Claim
23 words
The device defined in claim 3, further comprising a two-part metal foil package hermetically enclosing said housing for long-term storage of the device.
Claim 6
Dependent Claim
16 words
The device defined in claim 4 wherein said metal foil package is composed of aluminum foil.
Claim 7
Dependent Claim
36 words
The device defined in claim 4 wherein said base has an underside from which said outlet extends, said device further comprising a double-sided adhesive foil bonded to said underside and to metal foil of said package.
Claim 8
Dependent Claim
19 words
The device defined in claim 1 wherein said body and said reservoir are integrated in a unitary annular member.
Claim 9
Dependent Claim
15 words
The device defined in claim 7 wherein said member is composed of a silicone rubber.
Claim 10
Dependent Claim
29 words
The device defined in claim 7 wherein said body is provided with a radially prestressed cylindrical metal spring surrounding said reservoir to increase the long-term stability of the device.
Claim 11
Dependent Claim
14 words
The device defined in claim 9 wherein said spring is enclosed in said body.
Claim 12
Dependent Claim
22 words
The device defined in claim 9 wherein said spring is a coil spring having coil ends connected together and forming a toroid.
Claim 13
Dependent Claim
40 words
The device defined in claim 1 wherein said reservoir is provided between said wall and said support with bellows-like annular folds at opposite axial sides of said reservoir to eliminate any effect of axial forces on collapse of said reservoir.
Claim 14
Dependent Claim
13 words
The device defined in claim 12 wherein said folds extend into said reservoir.
Claim 15
Dependent Claim
50 words
The device defined in claim 1 wherein said support is annular, said device further comprising an application part inserted in said support and secured against rotation therein, said part being formed with said passage and said outlet and defining the rate at which said medicament is dispensed to said patient.
Claim 16
Dependent Claim
13 words
The device defined in claim 14 wherein said outlet is an injection needle.
Claim 17
Dependent Claim
32 words
The device defined in claim 14 wherein said housing comprises a lower member formed with said support and an upper member mounted on said lower member and provided with said application part.
Claim 18
Dependent Claim
25 words
The device defined in claim 1, further comprising a valve communicating with said reservoir for percutaneous refilling thereof by a needle injected into said valve.
Claim 19
Dependent Claim
27 words
The device defined in claim 1 wherein said passage is formed between said reservoir and said outlet with a filter at least in part controlling said rate.
Claim 20
Dependent Claim
12 words
The device defined in claim 1 wherein said outlet is a catheter.
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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) | 1991-11-01 | 1992-05-02 | 1992-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-01 | 1996-05-02 | 1996-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-01 | 2000-05-02 | 2000-11-01 | $7700.00 | Window Closed / Lapsed |