Claims
- 1. An intra-ruminal delivery device comprising:
- a tube having a partly or completely closed end and a partly or completely open end and a drug formulation for controlled release thereof through the open end of the tube;
- a piston adapted to travel longitudinally within the tube, the drug formulation located between the open end of the tube and the piston;
- a means for biasing the piston towards the open end of the tube; and
- a weight retaining the device within the rumen of a ruminant during delivery of the drug formulation and located on the surface of the piston remote from the biasing means, the weight being separable from the piston whereby the weight is expelled from the device from the open end following release of the drug formulation.
- 2. A device according to claim 1, wherein the weight comprises shot contained in a chamber located in the surface of the piston remote from the spring, said chamber opening into the interior of the tube.
- 3. A device according to claim 1, additionally including a drug formulation.
- 4. A method of administering a drug to a ruminant by causing a device according to claim 1 to be located within the ruminant's rumen.
- 5. An intra-ruminal delivery device comprising:
- a tube having a partially or completely closed end and a partially or completely open end and a drug formulation for controlled release thereof through the open end of the tube;
- a piston of sufficient weight to retain the device within the rumen of a ruminant during delivery of the drug formulation and adapted to travel longitudinally within the tube and be expelled from the open end of the tube following release of the drug formulation, the drug formulation located between the open end of the tube and the piston; and
- a means for biasing the piston towards the open end of the tube.
- 6. A device according to claim 5, wherein the piston is die-cast of zinc or of a zinc-containing alloy.
- 7. A device according to claim 5, wherein the piston comprises a chamber containing shot.
- 8. A device according to claim 7, wherein the chamber is sealed.
- 9. A device according to claim 5, additionally including a drug formulation.
- 10. A method of administering a drug to a ruminant by causing a device according to claim 5 to be located within the ruminant's rumen.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8829089 |
Dec 1988 |
GBX |
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Parent Case Info
This is a continuation of application Ser. No. 07/448,097 filed Dec. 12, 1989, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4675174 |
Eckenhoff |
Jun 1987 |
|
4772474 |
Eckenhoff |
Sep 1988 |
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Foreign Referenced Citations (2)
Number |
Date |
Country |
149510 |
Jul 1985 |
EPX |
174865 |
Mar 1986 |
EPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
448097 |
Dec 1989 |
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