Apparatus for displacing a piston in a chamber having a torque r

Details Apparatus for displacing a piston in a chamber having a torque r Apparatus for displacing a piston in a chamber having a torque r

1986-10-10

1988-09-06

Rosenbaum, C. Fred

Surgery

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

Treating material introduced into or removed from body...

128DIG1, 128 12, 128655, 222390, A61M 3700

Patent

active

047690097

ABSTRACT:
Apparatus for displacing a piston in a chamber comprising a support member, a motor including a housing and a driving member that rotates relative to the housing and a driving axis, the driving member being rotatably mounted with respect to the support member, a torque resistor between the motor housing and the support limiting relative rotation between the two except when the torque between the two exceeds a predetermined amount, a piston driver including a driven portion threadedly connected to the driving member and a displacement portion that is axially displaced in response to relative rotation between the driving member and the driven portion, and a housing rotation detector to detect when the housing rotates relative to the support, indicating resistance to axial movement of the piston driver.

REFERENCES:
patent: 3156236 (1964-11-01), Williamson
patent: 4465474 (1984-08-01), Mardorf et al.
patent: 4519258 (1985-05-01), Jakubowicz
patent: 4624658 (1986-11-01), Mardorf et al.

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