The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 03, 1993
Filed:
Oct. 07, 1991
Aisin Seiki Kabushiki Kaisha, Nagoya, JP;
Abstract
A pump unit for assisting in the blood feeding operation of a heart includes a pair of pumps 7a, 7b connected in parallel with each other. When the pump 7a (or 7b) has reached its expanded position and the pump 7b (or 7a) has reached its contracted position, the operation is changed so that the pump 7a (or 7b) is set up for contraction while the pump 7b (or 7a) is set up for expansion. A time difference TCM between the time when the expanded position is reached and the time when the contracted position is reached is determined. If TCM>Tr, a driving pressure for contraction is changed to a higher value while if TCM<Tr, a driving pressure for contraction is changed to a lower value. Tr represents a non-responsive interval which can be adjusted by an operator. When Tr has a high value, the pump exhibits a low flow rate which serves as a drive to assist in the delivery of blood by the heart. In this manner, the operator is enabled to adjust the driving flow rate.