Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1990-07-02
1991-12-24
Hindenburg, Max
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604134, 604135, A61M 530
Patent
active
050748432
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for subcutaneous injection without a needle.
Devices if this type have been known for a long time comprising a tubular body in which a piston is guided in reciprocating motion. An open end of the tubular body receives the injection head which includes a hole of very small diameter, generally in the range 0.2 mm to 1 mm. The piston received in the tubular body is associated with a spring thrust mechanism including means for locking it in a compressed position and for unlocking or releasing it.
The mechanical substance to be injected is sucked in through the open end of the tubular body and is contained in said end. The injection head is then mounted on said end of the tubular body, after which unlocking the thrust mechanism causes the piston to expel the substance through the very small hole in the injection head which is applied to the skin of the patient. The medicinal substance is then sprayed very finely and passes through the skin of the patient.
This method of injecting a medicinal substance is less traumatizing than using a conventional syringe with a needle. However, it is often observed that the skin of the patient is damaged at the point of injection, and that hematomas rapidly form due to blood vessels being ruptured. The patient may also feed quite sharp pain at the moment the substance is injected.
The object of the invention is to avoid these drawbacks.
The object of the present invention is to provide a device for subcutaneous injection without a needle, enabling the pain felt at the moment of injection to be considerably reduced, avoiding damage to the skin of the patient, and not creating hematomas, while nevertheless ensuring that a predetermined dose of medicinal substance is injected.
To this end, the present invention provides a device of the above-specified type for subcutaneous injection without a needle, the device comprising a tubular body having an injection head mounted at one end thereof, a piston guided to move inside the body, and a piston thrust mechanism housed inside the body and associated with locking means and with release means, the device being characterized in that the injection head comprises a plurality of injection holes having a diameter of less than about 100 microns.
The presence of a plurality of very fine injection holes having a diameter of less than about 100 microns in the above-specified head makes it possible to reduce by a factor equal to the number of holes: the time during which the substance is injected; the risk of hematomas forming; and the pain felt by the patient. The very small diameter of the injection holes makes it possible to spray the medicinal substance very finely and facilitates its passage through the skin of the patient.
According to another characteristic of the invention, the injection holes are parallel to one another and they are oriented perpendicularly to that surface of the injection head through which they open out.
The substance which is injected via these holes runs a smaller risk of rising beneath the skin of the patient than it would if it had been injected via obliquely oriented holes.
According to yet another characteristic of the invention, each injection hole is situated at the end of a cylindrical duct formed through the thickness of the injection head and having a diameter which is larger than the diameter of the injection hole, e.g. a diameter in the range 0.5 mm to 1 mm.
The presence of this cylindrical duct facilitates forming an injection hole of very small diameter.
According to yet another characteristic of the invention the injection head is made of stainless steel and the injection holes are not less than 0.5 mm long.
This characteristic is important insofar as shorter injection holes run the risk of metal flaking from around the holes because of the very high injection pressure through the holes.
in a preferred embodiment of the invention, the injection head is crimped onto a ring having an internal thread, thereby enabling the head to be screwed onto the end of the tubular bod
REFERENCES:
patent: 2681653 (1954-06-01), Kuhne
patent: 3140713 (1964-07-01), Ismach
patent: 3788315 (1974-01-01), Laurens
patent: 3802430 (1974-04-01), Schwebel et al.
P. N. Bissell et al., "EXIT the Needle", Engineering, vol. 211, No. 8, Nov. 1971, pp. 901-905.
Dalto Tino
Laruelle Claude
Hindenburg Max
Shumaker Steven J.
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