Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1983-07-19
1986-10-14
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604407, 604414, 128DIG1, A61M 520
Patent
active
046170162
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention refers to an injection device for medical purposes, designed for injection by means of a manual hypodermic syringe. It includes a barrel part which at one end has a syringe needle and at the other end a flange, and a plunger part having a plunger displaceable in the barrel part. The plunger is capable of performing movements, enabling medicine to be sucked into and respectively injected from the barrel part and has gripping means connected with the plunger by means of a plunger rod. The injection device has an opening, through which the injection syringe can at least partly be introduced into a cavity, and an inner part which is provided with a holding device for the barrel part.
When treating certain diseases it is required that the patient regularly, often daily, be supplied with medication by injection. One such disease is diabetes, affecting many people. It is important that these patients be able to inject themselves with insulin. However, complications are connected with this disease, and blindness is one of them. Many of the insulin dependent diabetics also have other additional diseases, which complicate the insulin injections, for instance a slight hemiplegia, rheumatism, or Parkinson's disease. The fact that the frequency of diabetes also increases with age makes loading and injection of insulin with a conventional hypodermic syringe a great problem.
The majority of diabetics use a completely manual hypodermic syringe, a so-called disposable hypodermic syringe. A blind or handicapped person has considerable difficulty in filling such a syringe with the prescribed amount of insulin and then inserting the needle into the skin followed by injection. An aid in the form of an injection gun is known; however, it only takes care of the inserting part. There are also some aids for loading but they are considered too impractical by patients.
It is an object of the present invention to provide an injection device with which loading, as well as inserting and injecting, can be accomplished without any demands being placed on the user's sight or manipulation ability.
BRIEF SUMMARY OF THE INVENTION
The object is achieved by means of an injection device according to the present invention, which is characterized in that it comprises a holding device which is changeable between a releasing position and a holding position, in which the barrel part is held against movements in its longitudinal direction relative to the inner part; and in that it also comprises a displacement device for displacing the plunger part in two directions relative to the barrel part between a fore and a rear displacement position, the arrangement being such that the fore displacement position is a releasing position for the plunger part. In the remaining displacement positions it is in a position to bring the plunger part to both displacement positions. The inner part is changeable between a rear position, with the syringe needle positioned inside said opening, and an advanced position, with the syringe needle pushed outside said opening in order to insert the needle into body tissue. The injection device includes an outer part, in which an electric motor is positioned and controlled by means of an electronic control device. The electric motor is by means of a transmission mechanism connected to the displacement device, for accomplishing its displacement movements in a sequence determined by means of the control device for loading the injection syringe, as well as for insertion and injection.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described with reference to the enclosed drawings, in which:
FIG. 1 shows a view, partly in section, of the injection device according to the invention, with an attached disposable hypodermic syringe;
FIG. 2 is a schematic section along the line II--II in FIG. 1 of the injection device;
FIGS. 3 and 4 show, on a larger scale, a partial view of a mechanism in the injection device for displacing the plunger part of the disposable hypodermi
REFERENCES:
patent: 3395704 (1968-08-01), Frey et al.
patent: 3701350 (1972-10-01), Guenther
patent: 3720211 (1973-03-01), Kyrias
patent: 4108177 (1978-08-01), Pistor
patent: 4273122 (1981-06-01), Whitney et al.
patent: 4405318 (1983-09-01), Whitney et al.
Lester Michelle N.
Rosenbaum C. Fred
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