Needle-less injection instrument

Details Needle-less injection instrument Needle-less injection instrument

1982-04-14

1983-08-02

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

A61M 530

Patent

active

043963846

ABSTRACT:
In this injection instrument, the piston pump (A) is connected to a drive motor (B), of which the working piston (5) supported on a working spring (2) is arranged displaceably in a cylindrical bore (6) of the motor housing (1). A pressure chamber (7) which has supply devices (3, 8) and discharge devices (4, 9) for pressure medium is formed in the bore (6).
To ensure that the pressure medium cannot be simultaneously supplied to and discharged from the pressure chamber (7), there is a control shaft (37) which is assigned to valves (8 and 9). The control shaft (37) is provided with a lever (38) and has segment-like recesses (39, 40) which interrupt the engagement of the valves (8, 9) with the control shaft (37). The recesses (39, 40) are arranged on the control shaft (37) so that the valves are not engaged simultaneously with the control shaft (37).

REFERENCES:
patent: 2642062 (1953-06-01), May
patent: 3908651 (1975-09-01), Fudge
patent: 4059107 (1977-11-01), Iriguchi et al.
patent: 4301795 (1981-11-01), Zimmerman

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