Medication injector

Details Medication injector Medication injector

1995-09-01

1998-09-22

Bockelman, Mark

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604212, 604262, 604263, 222 92, 222103, A61M 532

Patent

active

058107835

DESCRIPTION:

BRIEF SUMMARY
The present invention refers to a device intended to serve as basic element for a disposable injector for medications or diagnostic solutions, already containing the fluid for injection, ready for use.


BACKGROUND OF THE INVENTION

Presently, therapeutic or diagnostic solutions are administered, mostly, by means of syringes, actuated manually or by means of automated devices, the fluid being transferred to the syringes from glass vials or ampules. Conventional syringes present, however, many recognized disadvantages, as the need to fill the syringe from a separate vial, a cumbersome and time consuming process, including the risk of contamination and, in many cases, the plunger can be difficult to manipulate. In the case of infusion protocols, a bottle or a bag containing the solution to be administered must be connected the infusion tubing, by insertions of tubing spike thru the stopper in the bottle or to the connection in a bag, adding a step to the preparation for use, requiring, also, some degree of dexterity. Many attempts have been made to provide alternative devices to the conventional syringes, to overcome their disadvantages, and also that of the conventional and separately supplyed infusion bags or bottles and infusion tubings.
One type of approach has been to provide an injector system with a pre-filled collapsable reservoir with precisely mesured amounts of medication. These devices have flexible walls, so that its contents can be discharged by compressing or squeezing it. Devices of this type are exemplified in the following U.S. Pat. Nos.:


______________________________________ U.S. Pat. No. Patentee ______________________________________ 798,093 Dean 1,222,814 Storz 2,618,263 Lakso, et al. 3,099,264 Hubbard 3,114,369 Hall 4,013,073 Cunningham 4,018,222 McAleer et al. 4,130,117 Van Eck 4,475,906 Holzner 4,581,021 Landau et al. 4,955,871 Thomas 5,261,881 Riner ______________________________________
While the above-listed prior art devices do, in varying degrees, avoid the aforementioned problems associated with plunger-type syringes, they did not found spread application for several reasons, as for example, a lack of providing sufficient physical support for the needle during injection, some present difficulty for self-injection situations, specially for the physically feeble, some present the inability to be used with disposable needles, and also; in devices of this type some mechanism must be included to prevent escape of the fluid during storage before use adding complexicity and cost. Another problem with some devices of the type considered is the difficulty in injecting only a portion of the container volume, due to the tendence of the container wall material to return to its original shape, or memory, in case of relaxation of the pressure applied, resulting in the introduction of air or tissue aspiration. In the case of large volumes injections, there has been a need for systems easy and confortable to operators use, especially in injection procedures requiring extended periods of time. In the same way, there has been also a need for simpler infusion systems, ready for use, decreasing inventory items and adding simplicity.
In the Pat.Appl.PCT/BR94/00007, an injecting device has been proposed, based on a flexible plastic recipient containing the fluid, ready for use. However, in that device, the fluid discharge element, a luer-lock, demands a screw cap to avoid fluid escape before use, as well as the fluid container pressing plates and catchers are made in three separate members causing additional manufacturing difficulties.
Aiming to present a more efficient alternative, easier to use and more cost effective as compared to the conventional systems and other proposed devices as those in the above listed Patents, and also that described in the mentioned Application, by means of a single-acting device, it has been developed the present medication injector.
The invention can be better understood with the detailed description of the attached schedules, being:


REFERENCES:
patent: 798093 (1905-08-01), Dean
patent: 1222814 (1917-04-01), Storz
patent: 2618263 (1952-11-01), Lakso et al.
patent: 3099264 (1963-07-01), Hubbard
patent: 3114369 (1963-12-01), Hall
patent: 3736933 (1973-06-01), Szabo
patent: 4013073 (1977-03-01), Cunningham
patent: 4018222 (1977-04-01), McAleer et al.
patent: 4130117 (1978-12-01), Van Eck
patent: 4475906 (1984-10-01), Holzner
patent: 4581021 (1986-04-01), Landau
patent: 4692157 (1987-09-01), Landau
patent: 4955871 (1990-09-01), Thomas

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