Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1988-04-26
1990-11-06
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604 87, 604138, 604139, 604416, A61M 5700
Patent
active
049683020
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an automatic injection or hypodermic device, including a cartridge or ampoule, which is mounted in a casing, receives an injection substance, has a lifting element, surrounds an injection or hypodermic needle comprising an elongated needle body and a cannula or tubule. The needle being movable by the lifting element and has cannula inlet opening for the injection substance in the region of its drive-side end A seal arranged on the side of the needle point permits the passage of the needle shaft. An injection pressure device mounted on the casing applies a force to the lifting element. A release mechanism puts the pressure device into operation; and includes a safety device for blocking the release mechanism. A cartridge or ampoule for use in injection devices, particularly in an automatic hypodermic syringe, has an injection substance in the cartridge or ampoule that is ejectable, as a result of the lifting movement of a lifting element, such as in particular a plunger or bolt, through a cannula of an injection needle mounted on the cartridge or ampoule.
An automatic self-injection syringe gives unskilled persons an opportunity to make a subcutaneous or intramuscular self injection. This has particular significance in connection with the injection of atropine sulphate as a nerve gas preventative. In addition, atropine is injected as an effective antidote in the case of insecticide poisonings. Atropine is also injected, e.g. in the case of spasms and colics in the gastrointestinal tract, in the gall bladder or the discharging urinary passages, of bladder tenesmus, of hypersecretion of the stomach, of gastric and duodenal ulcers, bronchial asthma and in higher doses and over longer periods in the case of Parkinsonism. An automatic injection device can, in general, be used for the application of a large number of injection substances in human or veterinary medicine. Possibilities of use also exist in the technical field. Thus, in particular dangerous or toxic substances can be introduced into soft materials, mention being, for example, made of the preservation of soft wood or similar treatments. The injection substances can be constituted by liquids, gases or pressure-liquifiable substances.
Essential demands made on an automatic injection device consist in sterility, durability and stability even over long storage periods, in very rapid and reliable penetration of tissue parts having pain receptors by the needle, if necessary also after piercing articles of clothing, in low weight and compact construction, as well as in simple and operationally reliable handling.
In a known injection device of this type, a needle is mounted in an ampoule by localizing a needle base on a lifting plunger, as well as on the discharge side in a needle guide and a rubber plunger. A helical compression spring engages the ampoule sleeve for advancing the lifting plunger. In the case of such a construction, the guidance and mobility of the needle are impaired due to the decelerating effect of the relatively long rubber bearing and this can lead to a moment of force having an unfavourable action on the alignment and movement of the needle. A cannula opening provided on the needle base, i.e. a weakened needle portion at this point, can lead to a deformation or even breakage of the needle. To ensure that an adequate force is applied to the lifting plunger or for driving the needle, a relatively high force is required, which has to be imposed by the relatively long helical compression spring having a relatively large coil diameter, the spring following the plunger in an inner sleeve mounting both it and the ampoule, and engaging in the latter during operation. The ampoule body is made from stainless steel in order to withstand the force stressing. Due to catalytic effects and chemical and/or galvanic reactions of the metal with the injection substance, the stability and effectiveness thereof is reduced. Stainless steel is not inert for many injection substances, so that it cannot be used as ampoule material. The
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Scheller Albert
Schluter Eberhardt
Sprenger Rolf
Maglione C.
Rosenbaum C. Fred
Schluter Eberhardt
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