Medical Pump

Abstract

Medical pumps for water jet surgery are known. The invention relates to a pump comprising at least two pistons provided with piston rods for displacing the pistons in cylinders and for coupling to a pump actuation device, a cylinder head for closing the cylinders, and valve means for respectively connecting a pressure chamber in the cylinder to at least one fluid inlet and at least one fluid outlet. Said fluid outlet is connected to the fluid inlet in a communicating manner by means of an adjustable pressure regulating valve, in such a way that the pressure in the fluid outlet can be limited to a predetermined maximum value so that operation of the pump can be.

1 . Medical pump, comprising
 a pump actuating device;   at least two pistons with pistons rods for displacing the pistons in cylinders defined by said pump and coupling the pistons to said a pump actuation device;   a cylinder head sealing the cylinders;   valve means that respectively connect a pressure chamber in each of the cylinders with a fluid inlets and a fluid outlet; and   an adjustable pressure control valve is provided, in order adapted to limit the fluid pressure in each fluid outlet to a predetermined maximum value.   
   
   
       2 . Medical pump according to  claim 1 , wherein said pressure control valve is connected to said fluid inlet and said fluid outlet in such a way that, when the fluid pressure exceeds said predetermined maximum value, fluid from said fluid outlet is piped back to said fluid inlet. 
   
   
       3 . Medical pump according to  claim 1 , wherein at least one of said valve means or said pressure control valve comprises an elastic valve membrane ( 36 ). 
   
   
       4 . Medical pump according to  claim 1 , wherein said valve means comprise spring-loaded non-return ball valves 
   
   
       5 . Medical pump according to  claim 1 , wherein said pressure control valve comprises an actuator and is a power-controlled valve in which said predetermined maximum value is adjustable by a displacement force acting on said actuator. 
   
   
       6 . Medical pump according to  claim 1 , wherein said pistons and said piston rods are connected to the cylinders in a sealed manner which maintains sterility. 
   
   
       7 . Medical pump according to  claim 1 , wherein said valve means devices are fitted at least in part in said the cylinder head. 
   
   
       8 . Medical pump according to  claim 1 , wherein said cylinders are individually connected to said cylinder head. 
   
   
       9 . Medical pump according to  claim 1 , wherein said fluid outlet has connecting devices irreversibly connecting it to a pressure hose. 
   
   
       10 . Medical pump according  claim 1  wherein said cylinder head has holding means that holding catches, which are attached to said the pump actuation device. 
   
   
       11 . Medical pump according to  claim 1 , comprising an accumulator which is connected to the fluid outlet and which smoothes out pressure fluctuations in the fluid at the fluid outlet by means of a low pass function. 
   
   
       12 . Medical pump according to  claim 11 , wherein said accumulator is located in or is connected to said cylinder head. 
   
   
       13 . Medical pump according to  claim 1 , wherein said pressure control valve is fitted at least in part in said cylinder head.