Pumps – Expansible chamber type – Elongated flexible chamber wall progressively deformed
Patent
1984-11-19
1985-10-29
Smith, Leonard E.
Pumps
Expansible chamber type
Elongated flexible chamber wall progressively deformed
417477, F04B 4312
Patent
active
045498601
ABSTRACT:
The main application of this pump is for human heart coronary bypass, cardiac and transplant surgery. A non-occlusion blood pump of peristaltic type and blood pump tube element with pulsating pressure pump delivery, giving similar momentum to blood flow as a natural heart beat, needed to penetrate the capilaries, tiny blood vessels of human body. Most important improvement in this pump is in an especially conceived blood pump tube element which reduces hemolysis of blood by first being partially squeezed during pumping and thus not requiring any occlusion adjustments, second by its elements so structured to minimize internal flow friction and turbulance, both of these minimize the hemolysis of blood, as proved by tests. The devices comprised basically of two but not necessarily, blood pump tube elements. These elements are engaged by two sets of rollers driven in a circular path by an electric motor, one set is compressing the tube partially, while the other set is reshaping the tube, one roller at the time, thus reducing stresses on tube wall. This action causes series of discharge and suction pump cycles called pumping. Additionally, the relative position of the rollers to blood pump tube elements may be adjusted to change the delivery rate of blood by the pump. Said delivery change combined with continuous change of RPM (electronically) of an AC motor driving the pump allows this blood pump to deliver at same (or different) rate at wide range of frequencies (number of pulses per min.). This may open a new and exciting possibilities where some of diseases of human body may be treated by selective and optimized blood delivery/frequency applied locally to (detached from its own heart) diseased organ or part of human body, while the heart is active for the rest of the body.
None of the blood pumps presently on the market are able to deliver selectively, at desidered rate and frequency of pulse, the blood to the patient.
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Olds Theodore
Smith Leonard E.
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