Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1997-04-08
1999-07-20
Apley, Richard J.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604154, 604131, A61M 3700
Patent
active
059250186
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an infusion and microdialysis pump of the kind in which a plunger pump in the form of an injection syringe can be fitted in a casing, which includes a motor and drive means connected thereto, wherein the plunger can be moved in the pump chamber and therewith gradually press-out fluid for infusion and microdialysis purposes.
BACKGROUND OF THE INVENTION
Such devices are known and commercially available. Equipped with present-day electronic control devices, these devices are able to perform a large number of tasks, such as to inject into patients appropriately measured quantities of insulin or morphine, as required by the patient. Such arrangement are sufficiently small to be connected comfortably to the patient or carried comfortably thereby, and can therewith be used for microdialysis.
The price paid for the smallness and ease of handling of such devices, however, is that it is difficult and troublesome to fit the actual syringe. This difficulty can be tolerated, if necessary, when the device is filled and put in order clinically or polyclinically by experienced and trained personnel, but proves troublesome when a patient or relative has to fill and put the device in order in his or her own home. An object of the present invention is therefore to provide an infusion and microdialysis pump of the kind defined in the introduction where charging and insertion of a syringe into the casing can be effected without requiring particular expertise or skill.
SUMMARY OF THE INVENTION
In accordance with the invention, a syringe, preferably a disposable syringe, shall be capable of being fitted easily into a casing and connected to a motor-driven screw and kept in place by means of a lid, preferably a hinged lid, placed over the syringe. This will ensure that the syringe pusher will come into positive thread engagement with the screw, irrespective of the volume of fluid contained in the syringe. However, the strength of this thread engagement is not sufficiently great to prevent screw engagement being released by virtue of the elasticity of the runner should the screw be rotated to an extent greater than the length of stroke available in the syringe. The runner is preferably made of plastic, and can be made integral with the outer end of the pump plunger or may have the form of a separate component which can be fastened to said end.
The syringe has provided adjacent its outlet orifice a recess or like means which accommodates a bead in the injection position of the casing. When fitting the syringe into the casing, the syringe is placed with the recess against the bead, wherewith the rear part of the syringe rests inclined against a spring device. As a pivotal lid is then swung down over the syringe, the syringe will be moved around the bead to a position in which it lies parallel with the screw under the action of the spring device, so that the rearwardly seated runner on the pusher will be pressed down into a running position on the screw. The two legs of the runner press against the sides of the screw, and the serrated or grooved side of the runner will engage the screw over six-thread lengths, for instance.
In the case of a right-hand screw, it is suitable for the left-hand side of the runner to be in engagement with the screw, as seen in the outwardly projecting direction of the syringe, which causes the transverse forces that are exerted as the screw rotates and which are due to the inclination of the grooves and the threads will tend to cause the syringe to be drawn inwards and thus not outwards towards the lid.
The drive arrangement is designed as a casing for accommodating the pump chamber and a plunger, with a threaded screw connected to an electric, battery-operated motor, wherein the plunger rod extends beyond the pump chamber and carries a forked device which is open at right angles to the plunger axis and which can be caused to clamp resiliently around the screw, wherein at least one of the inwardly facing sides of the fork means has a grooved p
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Cordis Corporation, Cat. No. 404-100, 404-102, Lymphography Injector, 1972.
Apley Richard J.
CMA/Microdialysis AB
Yu Justine R.
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