Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1994-11-07
1997-04-01
Rimell, Sam
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604 51, A61M 520
Patent
active
056161280
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a self-injection device having a tubular sleeve in which an ampule is axially arranged and which is closed off by a membrane at the anterior end and by a piston at the posterior end, and having an injection needle guided axially displaceable in the ampule, configured to puncture the membrane and for injection at the anterior end, and in contact with the piston by way of a terminal flange at the posterior end.
However, the invention may also be applied to self-injection devices comprising a tubular sleeve in which an ampule is guided axially displaceable and which is closed off by a membrane at the anterior end and by a piston at the posterior end, and further comprising an injection needle guided axially displaceable in the sleeve ahead of the ampule and configured for injection at the anterior end and to puncture the membrane at the posterior end.
Such devices serve chiefly for emergency medication such as antidotes. For this purpose, the device must be ready for instant use, absolutely trouble-free in operation, and ensuring sterility of the medication contained and of the enclosed needle over a long period.
German Patent 1,094,932, U.S. Pat. No. 3,320,955, U.S. Pat. No. 4,624,660 and European Patent 0,107,874 disclose devices of the kinds initially mentioned in which the advance of the injection needle from the sleeve and the advance of the piston in the ampule are effected by spring action. Thus the piston is acted upon by a piston rod engaged at the posterior end of the device by several snap hooks in an axial aperture of a rear wall of the sleeve and prestressed by a strong spring slipped over the piston rod and tending to propel it forward. The spread of the snap hook of the piston rod at the posterior end of the sleeve is secured by a locking pin introduced from the rear centrally between the snap hook catching the rim of the hole in the rear wall of the sleeve. To trigger the injection, first the locking pin is pulled away axially towards the rear, and then, by slight displacement of an actuating sleeve slipped over the main sleeve and having projections on the inside for the purpose, the snap hooks of the piston rod are pinched together. Since the snap hooks no longer engage the edges of the opening, the suspension of the piston rod in the sleeve is released, and the spring drives the piston rod forward. By the forward motion of the piston rod, in the kind of device first mentioned the injection needle simultaneously punctures the ampule membrane, and during the advance of the piston and injection needle, delivers the medication contained in the ampule into the body. In the second kind of device initially mentioned, the advance of the piston first effects an advance of the entire ampule and of the injection needle arranged ahead of it until the latter has entered the body, and then a puncture of the ampule membrane by the posterior end of the needle, and finally an advance of the piston in the ampule with simultaneous expulsion of the medication through the needle into the body.
So in these known devices the process of injection is fully automatic after removal of the locking pin, if the actuating sleeve is shifted slightly relative to the inner sleeve for triggering, i.e. if the actuating sleeve is grasped and pressed against a body part, since this brings the inner sleeve into contact with the body part and shifts it slightly relative to the actuating sleeve. The process of injection then occurs instantaneously. This triggering method, however, has the disadvantage that after removal of the locking pin, the automatic injection will be brought about even by slight concussions, impacts or dropping of the device, spilling the medication and rendering the device worthless. The known devices therefore fall short of the requirement of absolutely trouble-free operation under the most adverse conditions, such as typify emergency use.
The object of the invention is to improve devices of the kind initially mentioned in such a manner that an unintentional triggering can be ruled o
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patent: 5391151 (1995-02-01), Wilmot
MED-Plastic AG
Rimell Sam
LandOfFree
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