Infusion device

Details Infusion device Infusion device

1988-11-25

1990-11-13

Green, Randall L.

Surgery

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

Treating material introduced into or removed from body...

604141, 604143, 604145, A61M 3700

Patent

active

049698745

DESCRIPTION:

BRIEF SUMMARY
The invention relates to an infusion device.
The invention is based on the object of providing an infusion device which is economical, compact, lightweight, reliable and safe in its function, simple to manipulate, operable in any position, suitable for outpatient use, and suitable also for being carried on the body of the patient.


SUMMARY OF THE INVENTION

To achieve the foregoing objects of the invention a medical infusion device is provided which uses a gas generating galvanic cell, having a load resistor connected across the galvanic cell, for activating the medical infusion device, which comprises a chamber for accommodation of a liquid to be infused into the body of a patient, this chamber having an outlet for the infusion liquid and being variable in volume by a moveable wall, which wall, on the side facing away from the chamber, is subjected to the pressure of a gas constantly being delivered by a gas generating galvanic cell under the load of a resistor. In one form of the invention, the chamber accommodating the infusion liquid and the moveable wall comprise a compressible bag-like container for the infusion liquid, the bag being connected inside a chamber of the medical infusion device into which the gas from the galvanic cell is delivered whereby the outside of the bag is subjected to the pressure of the gas which moves or collapses the flexible wall of the bag-like container to dispense the infusion liquid therefrom through the outlet. In another form of the invention, the chamber accommodating the infusion liquid is a substantially cylindrical ampoule and the moveable wall comprises a piston closing one end of the ampoule and moveable toward the infusion liquid in said ampoule, by the gas generated from a galvanic cell connected in a chamber behind the moveable wall or piston, to dispense the infusion liquid from the outlet in the opposite end of the ampoule.


BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the invention will be described in greater detail below with reference to the drawings wherein:
FIG. 1 shows an axial longitudinal section through a first embodiment of the infusion device with a connection unit pertaining thereto, in exploded representation,
FIGS. 2a-2e show schematic views,
FIG. 3 is an axial longitudinal section through a second embodiment of the infusion device with an associated connection unit, in exploded view,
FIG. 4 shows an axial longitudinal section through one version of the second embodiment,
FIG. 5 shows an exploded view of a preferred, third embodiment of the infusion device,
FIG. 6 is an illustration of the embodiment of FIG. 5 in a condition ready for operation, partially in a sectional view, and
FIG. 7 is an axial longitudinal section through the insert head, introduced into the ampoule, pertaining to the infusion device ready for operation according to FIG. 6, on an enlarged scale.
The infusion device illustrated in FIG. 1 consists in its basic structure of a bipartite housing 1, 2, a compressible, bag-like container 3 for the infusion fluid, this container being arranged in the housing 1, 2 and being connectible on the outside of this housing to a hose or infusion catheter 4, and of a means 5, 33 for producing a constant excess pressure in the portion 6 of the housing space surrounding the container 3, this means consisting, in the illustrated embodiment, of a galvanic cell 5 and a pressure relief valve 33 responding at the desired excess pressure. The galvanic cell 5 is, for example, of the type known from DOS 3,532,335 and preferably has a structure corresponding to the button cell described therein, similar to the commercially available zinc/air cell particularly for use in hearing aids, but employed for the novel task, foreign to its usual purpose, of hydrogen release by short-circuiting the cell by way of a low resistance while preventing the access of air, resulting in hydrogen generation and the production of an expanding flow. The gas-generating galvanic cell 5 contains in the initial condition, (a) only electrochemically oxidizable material

REFERENCES:
patent: 2545017 (1951-03-01), Billingsley
patent: 3433224 (1969-03-01), Black
patent: 4113144 (1978-09-01), Hein et al.
patent: 4351335 (1982-09-01), Whitney et al.

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