Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1997-09-05
2000-08-22
Stright, Ronald
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604224, 604232, A61M 500
Patent
active
061065013
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for repeatedly injecting dosages of a liquid medicament from a container for liquids, especially a carpule (=injection ampoule), equipped with a piston, said container being attachable to or detachable from a manually drivable transmission incorporated into a transmission sleeve, said transmission comprising a drive member comprised of a guide button and a carrier sleeve firmly attached thereto, said drive member being disposed rotatably and shiftably in the advance direction of the piston in the transmission sleeve, a driven member comprised of a threaded rod and a flange, said driven member being shiftable in the advance direction of the piston and being carriable over a certain distance under the influence of the drive member executing longitudinal shifts, a transmission element being screwably disposed on the threaded rod and having the effect of the driven member being carried along by the drive member, a compression spring acting between the transmission sleeve and the carrier sleeve, in which the drive member is lockable by a locking device, the threaded rod of the driven member is disposed nonrotatably and shiftable in the longitudinal direction in the transmission sleeve, and the transmission element is rotatable but attached shiftably in the longitudinal direction to the drive member.
2. Description of the Prior Art
Such injection devices have been known for some time, for example a device described in EP-0 245 312 B1 which must be regarded as the closest prior art. It has the purpose of injecting respectively selectable amounts of liquid from a container for liquids equipped with a piston, especially a carpule (=injection ampoule).
Said carpule in a carpule holder is attachable to or detachable from a manually drivable transmission. The transmission is incorporated into a transmission sleeve. In addition to other parts, it comprises attached thereto, said drive member being disposed rotatably and shiftably in the advance direction of the piston in the transmission sleeve, member being shiftable in the advance direction of the piston and being carriable over a certain distance under the influence of the drive member executing longitudinal shifts, sleeve.
While being operated, the injection device may be in the following positions: distance from the piston and the transmission element is close to the piston, but the transmission element, depending on the amount of liquid to be injected, is further away from the piston than in its home position, driven member has protruded further from the transmission than in the home or intermediate position and has penetrated into the carpule which causes injection of the selected amount of liquid.
The final position reverts to the home position by itself.
The transmission is not locked in any of the three positions so that it may be exposed to influences during storage or transport of the injection device which may cause a change in the amount of liquid in the carpule or even permit the entry of air into the carpule. In addition, it has many components, some of which are not very easy to manufacture.
SUMMARY OF THE INVENTION
The invention is based on the objective to provide an injection device which is self-lockable in at least one position which is then regarded as the final position.
The subject matter of claim 1 is the solution of this objective according to the invention. Preferred additional embodiments of the invention are described in detail in the ensuing claims. The injection device described in these claims can be comprised of fewer components than comparable devices with the components being easier to manufacture than known injection devices.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following, one embodiment of the invention will be illustrated in detail on the basis of the drawing, wherein
FIG. 1 shows an axial longitudinal section through the injection device according to the invention in one final position;
FIG. 2 shows the same in a home positi
REFERENCES:
patent: 4865591 (1989-09-01), Sams
patent: 4973318 (1990-11-01), Holm et al.
patent: 5114406 (1992-05-01), Gabriel et al.
patent: 5279585 (1994-01-01), Balkwill
patent: 5549575 (1996-08-01), Giambattista et al.
patent: 5591136 (1997-01-01), Gabriel
Disetronic Licensing AG
Nguyen A. T.
Stright Ronald
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