GB2115073A
Expired / Lapsed
GB
⏱️ 0.0 years remaining
Gas diffusion-limited controlled release devices
Assignee: Commonwealth Scientific and Industrial Research Organisation
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Filing: 1983-02-16
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Granted: —
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Expires: 2003-02-16
Abstract
Abstract A device for controllably delivering a solid, paste or liquid material in biological, environmental or industrial systems. The device (1) is in the form of a tubular body (2), one end (3) of which is open to allow egress of the material and the other (9) is closed. A gas-tight plunger (5, 15) slides within the body by virtue of spring driving means (6) and gas from the external environment which enters the closed end (9) of the tubular body by way of a gas permeable membrane and acts together with the spring (6) on the rear face of the plunger. The plunger (5, 15) controllably ejects the material (8) from the open end (3) of the device. The device has particular use in the delivery of therapeutic and/or prophylactic materials to animals. <IMAGE>
Inventors
- 👤 Ralph Henry Laby
- 👤 Bruno Kautzner
Bibliographic Details
Application Number
—
Jurisdiction
GB
Data Source
google_patents
Last Synchronized
2026-10-22 19:31
CPC Classifications
B; B65; B65D; B65D83/00; B65D83/76; B65D83/766
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
138 words
A controlled release device comprising a hollow tubular body adapted to contain a solid, paste or liquid material, one end of said body being at least partly open to allow egress of the material, the other end of said body being closed, a gas-tight plunger adapted for slidable movement within the body, spring driving 5() means located between the plunger and the closed end of the body for urging the plunger and hence the 50 material ahead of the plunger towards the open end of the body, and wherein a membrane is provided in the closed end of the body and/or in the wall of the body adjacent the closed end whereby gas from the external environment can diffuse into the body behind the plunger and thereby allowthe plunger to move under the influence of the spring means.
Claim 2
Dependent Claim
138 words
A controlled release device comprising a hollow tubular body adapted to contain a solid, paste or liquid material, one end of said body being at least partly open to allow egress of the material, the other end of said body being closed, a gas-tight plunger adapted for slidable movement within the body, spring driving 5() means located between the plunger and the closed end of the body for urging the plunger and hence the 50 material ahead of the plunger towards the open end of the body, and wherein a membrane is provided in the closed end of the body and/or in the wall of the body adjacent the closed end whereby gas from the external environment can diffuse into the body behind the plunger and thereby allowthe plunger to move under the influence of the spring means.
Claim 3
Dependent Claim
45 words
A controlled release device as claimed in Claim 1, wherein the gastight plunger comprises a disc of 55 waxy solid material having lubricating properties, and compression means for providing compressive forces on the disc in an axial direction, thereby urging the disc to expand radially.
Claim 4
Dependent Claim
21 words
A controlled release device as claimed in Claim 2, wherein the disc of waxy material having lubricating properties in stearylamine diethoxylate.
Claim 5
Dependent Claim
39 words
A controlled release device as claimed in Claim 2, wherein the compression means comprises two 60 essentially rigid plates which are slightly smaller in diameter than the lubricant disc which is clamped between the plates by a spring mechanism.
Claim 6
Dependent Claim
54 words
A controlled release device as claimed in Claim 1, wherein the gastight plunger comprises an elastic or resilient moulded material containing a waxy lubricant under compression so that the waxy lubricant is forced to expand radially against the inside walls of the tubular body. r 1 1 A GB 2 115 073 A 5
Claim 7
Dependent Claim
32 words
A controlled release device as claimed in Claim 1, wherein the gas diffusion membrane is composed of a material selected from the group consisting of polypropylene polyethylene, natural rubber, polyvinylchloride and silicone.
Claim 8
Dependent Claim
29 words
A controlled release device as claimed in Claim land adapted to contain a liquid, said device including 5 a non-return valve in the open end of the tubular body.
Claim 9
Dependent Claim
89 words
A controlled release device as claimed in Claim 1 and including a resilient member forming a first configuration with the tubular body and which is capable of being resiliently deformed to provide a second configuration in which the device is capable of being administered to an animal, said resilient member being capable of reverting to the first configuration when the device reaches the desired position within the animal lo after administration thereof, said first configuration being such as to substantially reduce the possibility of 10 expulsion from the animal.
Claim 10
Dependent Claim
22 words
A controlled release device as claimed in Claim land substantially as herein described with reference to Figures lA- 11) of the drawing.
Claim 11
Dependent Claim
51 words
A controlled release device as claimed in Claim land substantially as herein described with reference to anyone of the Examples. Printed for Her Majesty's Stationery Office, by Croydon Printing Company Limited, Croydon, Surrey, 1983. Published by The Patent Office, 25 Southampton Buildings, London, WC2A lAY, from which copies may be obtained.
References Cited (Backward Citations)
No citation records indexed.
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