Pulsatile flow cardiopulmonary bypass pump

Details Pulsatile flow cardiopulmonary bypass pump Pulsatile flow cardiopulmonary bypass pump

1980-03-26

1981-10-13

Mancene, Gene

Surgery

Truss

Pad

128 1D, 74 57, 417412, A61F 100, A61B 1900, F04B 4300

Patent

active

042939615

ABSTRACT:
A pulsatile flow cardiopulmonary bypass pump for use outside of the body during cardiac surgery and/or in the period immediately thereafter is disclosed. A grooved spinner is motor driven through a fluid coupling which enables idling of the spinner during diastole. The shell of the pump has a roof to which the spinner drive motor is attached, and the roof can move axially of the shell body and is biased resiliently in one axial direction. The roof of the shell moves as a function of duration of systole and magnitude of afterload, reducing stroke volume in the presence of high afterload. A groove rider having a friction reducing ball bearing drives a ring follower housing during rotation of the spinner. The groove rider is positively displaced from engagement with a holding magnet on the ring follower housing by relatively stationary camming element external to the spinner, and a camming part on the far end of the spinner positively displaces the groove rider from the driving groove of the spinner into engagement with the holding magnet at the end of systole. A rough ride of the groove rider along the spinner during diastole is avoided, and the groove rider is not depenedent on spring action.

REFERENCES:
patent: 314469 (1885-03-01), Perkins et al.
patent: 396147 (1889-01-01), Monnin
patent: 3260289 (1966-07-01), Whitten, Jr.
patent: 3406625 (1968-10-01), Chamness et al.
patent: 4143425 (1979-03-01), Runge

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