Device for producing an artificial blood circulation
First Claim
Patent Images
1. Pump for producing an artificial blood circulation of the type comprising:
- a tubular body having end fittings for connection to a blood circuit,unidirectional inlet and outlet valves in respective end fittings,an elastically deformable tubular membrane, located within the tubular body and fixed to the latter at its two ends to define a pumping chamber within the tubular membrane, in communication with the two said end fittings, and to define an annular control chamber between the tubular body and the said tubular membrane;
means for placing said annular control chamber alternately in communication with a source of driving fluid under pressure and with a source of lower pressure to deform the tubular membrane cyclically between an undeformed substantially cylindrical shape and a deformed substantially hourglass shape and vice versa, anda pressure regulator for regulating the pressure of the driving fluid,wherein the improvements reside in the further provision of;
a feeler supported in the tubular body of the pump for sliding movement along an axis which is substantially perpendicular to the longitudinal axis of said tubular body and is located at substantially equal distances from the ends of said tubular body;
resilient means urging the inner end of the feeler into contact with the outer surface of the tubular membrane;
a switch having fixed contact means carried by the tubular body of the pump and movable contact means carried by said feeler, said movable contact means coming into contact with said fixed contact means to close the said switch when the feeler, starting from a rest position corresponding to the undeformed configuration of the tubular membrane, has been displaced to a switch closure position corresponding to a predetermined deformation of the tubular membrane;
stop means to prevent further displacement of said feeler under the action of said resilient means after said closure of the switchan electrical circuit which is completed upon said closure of the switch, anda signalling member in said electrical circuit which is energised upon closure of said switch
0 Assignments
0 Petitions
Accused Products
Abstract
A pump has a tubular membrane (14) deformed cylindrically by fluid driving pressure to produce an artificial blood circulation. The pump has a feeler (42) which follows the deformation of membrane (14) and operates a switch (102) to close the circuit of an optical signalling device (103) when the deformation of the membrane (14) reaches a predetermined value. A control circuit (104) may be provided for the automatic regulation of the fluid driving pressure acting on the membrane (14) in dependence upon the duration of the closure time of the switch (102). (FIG. 7).
52 Citations
6 Claims
-
1. Pump for producing an artificial blood circulation of the type comprising:
-
a tubular body having end fittings for connection to a blood circuit, unidirectional inlet and outlet valves in respective end fittings, an elastically deformable tubular membrane, located within the tubular body and fixed to the latter at its two ends to define a pumping chamber within the tubular membrane, in communication with the two said end fittings, and to define an annular control chamber between the tubular body and the said tubular membrane; means for placing said annular control chamber alternately in communication with a source of driving fluid under pressure and with a source of lower pressure to deform the tubular membrane cyclically between an undeformed substantially cylindrical shape and a deformed substantially hourglass shape and vice versa, and a pressure regulator for regulating the pressure of the driving fluid, wherein the improvements reside in the further provision of; a feeler supported in the tubular body of the pump for sliding movement along an axis which is substantially perpendicular to the longitudinal axis of said tubular body and is located at substantially equal distances from the ends of said tubular body; resilient means urging the inner end of the feeler into contact with the outer surface of the tubular membrane; a switch having fixed contact means carried by the tubular body of the pump and movable contact means carried by said feeler, said movable contact means coming into contact with said fixed contact means to close the said switch when the feeler, starting from a rest position corresponding to the undeformed configuration of the tubular membrane, has been displaced to a switch closure position corresponding to a predetermined deformation of the tubular membrane; stop means to prevent further displacement of said feeler under the action of said resilient means after said closure of the switch an electrical circuit which is completed upon said closure of the switch, and a signalling member in said electrical circuit which is energised upon closure of said switch - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification