Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1995-09-08
1998-09-15
Coggins, Wynn Wood
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604209, 604232, A61M 500
Patent
active
058073469
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a metering instrument, particularly for medicinal liquid, allowing successive dispensing of several doses of a liquid or other fluid, from a load or refill.
This instrument relates nonexclusively to an injection instrument of the syringe type allowing parenteral administration or self-administration of several doses of a medicinal liquid drawn from an ampule such as an ampule of the "Carpule" type, which is a glass, rubber-stoppered cartridge containing local anesthetic solutions, fitted in a special syringe for hypodermic injection.
Description of the Prior Art
Document FR-A-1,170,312 relates to a syringe-type injection device in which the rod of the plunger is actuated by a rack, said rack being driven in the injection direction by a first ratchet device, and is held back in the opposite direction of motion by a second ratchet device.
Document EP-A-0,416,975 relates to a device allowing several injections to be given from the same refill, comprising a tubular body designed to be held by the user, a reservoir containing the liquid load, disposed at one end of the body, a pusher mounted coaxially and free to move translationally inside the body, activatable by the user by one of its ends, which projects beyond the body on the side opposite the reservoir, a tail in the shape of a helical rack, mounted inside the pusher, having one end resting on the bottom of the reservoir. A first ratchet means, associated with the body, allows the tail to move in the injection direction but not in the reverse direction, while a second ratchet means associated with the pusher engages the tail when the latter moves in the injection direction, and releases the tail when the pusher is moved in the other direction.
The volume of the injected dose is determined essentially by the number of clicks corresponding to passage of the notches of the tail along the ratchet means associated with the body. This solution is totally unsatisfactory, in that it offers no safety, particularly when the person who must self-administer an injection is a handicapped person or has lost manipulation skills or who, in an emergency, must very quickly inject a predetermined dose of an active principle.
Another solution consists of having a mechanism for adjusting the initial position of the pusher establishing the translational travel of the latter relative to the tail, this translational adjustment being effected by means of a helical external thread incorporated into the tail, engaged by an interior notch provided on the pusher, whereby rotation of the pusher relative to the tail allows said pusher to be retracted inside the body or extended therefrom for an adjustable distance. This change in the axial starting position of the pusher determines the travel thereof relative to the body and hence the volume of the injection dose.
The latter device has a large number of parts that cannot be joined together automatically, resulting in a high cost price incompatible with single use. Under these conditions, such an instrument cannot be disposable.
Moreover, the way in which it is used remains complicated and, like the device described previously, it cannot be used by handicapped persons who do not have all their faculties, or in an emergency when a dose must be injected very rapidly.
SUMMARY OF THE INVENTION
The goal of the invention is to furnish a metering instrument for injecting medicinal liquid, of simple design, made with a small number of parts, assemblable very rapidly and automatically, ergonomic, offering high precision in the volume of the dispensed or injected dose, and with the possibility of setting to several different dose volumes.
For this purpose, the instrument to which it relates, of the type comprising: body, said reservoir having a tubular wall on the axis of the body, a plunger forming a seal, closing off one end of said tubular wall, displaceable toward the other end in a direction known as a reference direction, and a perforable stopper closing off the other end thro
REFERENCES:
patent: 4865591 (1989-09-01), Sams
patent: 4973318 (1990-11-01), Holm et al.
patent: 5084017 (1992-01-01), Maffetone
patent: 5158549 (1992-10-01), McCarthy
patent: 5279585 (1994-01-01), Balkwill
Coggins Wynn Wood
Laboratoire Aguettant
Nguyen A. T.
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