Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1987-12-10
1989-08-15
Pellegrino, Stephen C.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604181, A61M 500
Patent
active
048570591
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an implantable device for the repeated self-injection of a medicament, and more particularly analgesic, in unitary doses and at a frequency which is a function of the therapeutic treatment needs and in particular of the desired analgesic action.
At the present time, particularly in relation with drugs prescribed in pain-killing treatments, they are administered to a patient as a function of the state of gravity of his illness and the intensity of the painful syndrome.
either in isolated injections, which in numerous cases raises the problem of repeated pricks,
or in a previously implated site in a subcutaneous position cooperating with a catheter implanted at the level of the analgesic action zone, this solution nevertheless not overcoming the problem of repeated pricks.
Several implantable devices of the above mentioned type exist, described more particularly in patents U.S. Pat. No. 4,588,394, FR-2 569 987 and EP-143 503 - which are however designed for avoiding involuntary interventions and which, therefore, do not prevent overdoses through undue (voluntary) intervention, particularly through forgetfulness - as well as in patents U.S. Pat. No. 4,193,397 and U.S. Pat. No. 4,258,711 which describe an "artificial pancreas" for the continuous administration of a medicament (called basal administration) possibly reinforced by an administration for confronting exceptional situations, particularly during meals (and corresponding to the administration of a "bolus" intended to flow progressively towards the concerned zone of the organism).
The purpose of the present invention is to provide a device for the repeated injection of unitary medicament doses and particularly analgesic, which answers better the requirements of practice than the devices known at the present time, particularly in that:
it makes possible the injection, without requiring a prick on the part of the patient himself, and depending on the requirements, in particular of the analgesic doses strictly required,
pricks are required for supplying the medicament, particularly analgesic, and not for injecting this latter, so that their number is considerably reduced and two consecutive pricks are spaced very far apart in time, which substantially reduces the risks of infection and therefore makes it possible to provide for example intraspinal and no longer peridural injection, which in its turn reduces the effecient doses of analgesic by a factor at least equal to 3, and
it ensures the necessary safety in use by preventing overdoses.
The present invention has as object a device for the repeated injection of medicament in unitary doses and at a frequency which is a function of the therapeutic treatment needs, said device being intended to be implanted in the body of a patient and comprising a site for injection of the medicament, intended to be implanted below the skin of the patient, an external means for supplying this site, comprising particularly a needle for pricking said site connected to a syringe or to a pump, and a catheter for injecting each unitary dose of medicament intended to be implanted in the therapeutic action zone, which device is characterized in that it further comprises:
a reservoir, made from a flexible plastic material such as silicone elastomer, intended for storing the medicament between two restocking operations by means of said syringe and through said injection site.
a first connection tube made from a flexible plastic material, such as that used for the reservoir, and connecting this reservoir to said injection site,
a pre-dosed small balloon, having an inlet and an outlet and intended for controlling the injection of medicament, itself also made from a flexible plastic material, such as the one used for the reservoir, whose volume is calculated as a function of the unitary dose of medicament to be injected through said catheter and by pressure of this small balloon obtained by cutaneous digital deformation,
a second tube for connection between the small balloon and the reservoir, it also l
REFERENCES:
patent: 4258711 (1981-03-01), Tucker et al.
patent: 4337770 (1982-07-01), Young et al.
patent: 4544371 (1985-10-01), Dormandy, Jr. et al.
patent: 4588394 (1986-05-01), Schulte et al.
patent: 4634427 (1987-01-01), Hannula et al.
patent: 4710177 (1987-12-01), Smith et al.
Abbou Clement
Leandri Jacqueline
Rey Pierre
Sezeur Alain
Centre National de la Recherche Scientifique
Daley Kathleen A.
Pellegrino Stephen C.
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