Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1990-05-03
1992-09-15
Hirsch, Paul J.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604131, 604135, 604148, A61M 524, A61M 5315
Patent
active
051473119
DESCRIPTION:
BRIEF SUMMARY
The invention concerns an injection device with a housing that accommodates a holder for a deformable ampoule that contains a medicament, with a hypodermic needle inserted in one end of the housing and communicating with the inside of the ampoule and with an activating mechanism at the end of the housing remote from the needle.
Various injection devices are known that a deformable ampoule can be employed in. One injection device of this type is known from European A1 0 170 784. It features a fold-up housing with accommodation for an ampoule in the form of a bellows. One end of the bellows is positioned directly in the housing and an activating mechanism is associated with the activating mechanism at the other end of the ampoule. The activating mechanism consists of a plunger that can be displaced toward the outlet by means of a spindle-and-traveling-nut device. The threaded spindle is rotated by an electric motor. A hypodermic needle can be inserted into the end of the ampoule that projects out of the housing. The medicament inside the ampoule can be forced out through the needle in a length of time that varies with how fast the piston travels. The bellows-type ampoule is difficult to handle when it is inserted in the housing. It is also impossible to control the dose of medicament.
Another type of injection device that employs a deformable ampoule is known from U.S. Pat. No. 4,525,164. This ampoule is in the form of a flexible tube arrayed in a semicircle and has a hypodermic needle at each end. A squeezing roller is positioned at the other end of the ampoule as the medicament inside it begins to be released. The medicament is released from the ampoule by rolling the roller toward the ampoule's needle end. The ampoule is accordingly squeezed between the roller and the opposite wall of the housing that accommodates the ampoule. As the roller advances toward the hypodermic needle, the medicament inside the ampoule is forced out through the needle. More or less medicament is injected through the needle depending on how rapidly the roller is advanced. The squeezing roller in this embodiment of the device is secured to a revolving ring that has teeth along one edge and engages a pinion driven by an electric motor. This deformable ampoule is also difficult to handle when inserted into the housing, and the dose of medicament injected through the needle is difficult to monitor.
Another injection device, known from European A2 0 178 371, also employs a bellows-type ampoule accommodated in a cylindrical housing, whereby one outside diameter and one length of the ampoule essentially equals one inside diameter and one inside length of a tubular housing. One end of the tubular housing is sealed to a base plate. A cap can be screwed into the tubular housing from the other end. Between the base plate and the cap is a resiliently deformable ampoule. Screwing the cap into the tubular housing forces the medicament out of the ampoule and into the needle. Inserting the deformable ampoule into this embodiment of an injection device also demands very careful handling, and the dosage precision is inadequate in many situations. The object of the present invention is to provide an injection device that will facilitate handle deformable ampoules when they are employed with it and that will itself also be easy to use.
This object is attained in accordance with the invention in that the ampoule is positioned and secured in a support that extends from one end of the housing to the other.
The major advantage of this approach is that the support makes it possible to employ plastic ampoules that are just as easy to handle as glass ampoules. Furthermore, it is easier to control the flow of the medicament in the ampoule in that the ampoule is secured in the support while it is being deformed to force out the medicament, and the support can be designed to secure it in that way. Another and surprising advantage of this approach is that the ampoules do not have to have pistons inside them that have to be sealed off. The component that deform
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