Clinically usable pump apparatus for a dilatation device

Claim 2

A clinically usable pump apparatus for a dilatation device having a dilatation catheter, preferably for opening stenoses and occlusions or for closing vessels, ducts and openings, while utilizing a pumpable medium, comprising: a pump adapted to be connected with the dilatation catheter for applying controlled positive pressure and negative pressure conditions to the dilatation catheter; means for structuring the pump for accomplishing the double function of generating a positive pressure as well as a negative pressure in a closed hydraulic system between the pump and the dilatation catheter; mechanical drive means for driving said pump; said mechanical drive means comprises: a work cylinder; a work piston slidably arranged in said cylinder for carrying out forward and return strokes; said work piston having opposite faces; means for supplying and impinging opposite faces of said work piston with a pressurized medium; and an excess-pressure valve for preventing that a preselected maximum pressure will be exceeded in the dilatation catheter.

Claim 3

A clinically usable pump apparatus for a dilatation device having a dilatation catheter, preferably for opening stenoses and occlusions or for closing vessels, ducts and openings, while utilizing a pumpable medium, comprising: a pump adapted to be connected with the dilatation catheter for applying controlled positive pressure and negative pressure conditions to the dilatation catheter; means for structuring the pump for accomplishing the double function of generating a positive pressure as well as a negative pressure in a closed hydraulic system between the pump and the dilatation catheter; mechanical drive means for driving said pump; said mechanical drive means comprises: a work cylinder; a work piston slidably arranged in said cylinder for carrying out forward and return strokes; said work piston having opposite faces; means for supplying and impinging opposite faces of said work piston with a pressurized medium; said pump comprising a piston pump having a piston rod; said mechanical drive means further including a piston rod provided for the work piston; said piston rod of the pump and said piston rod of said mechanical drive means being arranged essentially in alignment with one another; means for operatively coupling said piston rod of said pump and said piston rod of said mechanical drive means with one another; and said coupling means comprising a coupling body having a substantially dovetail-shaped groove provided at one of the piston rods and a fitting element having a cross-section corresponding essentially to said groove attached to the other piston rod.

Claim 4

A clinically usable pump apparatus for a dilatation device having a dilatation catheter, preferably for opening stenoses and occlusions or for closing vessels, ducts and openings, while utilizing a pumpable medium, comprising: a pump adapted to be connected with the dilatation catheter for applying controlled positive pressure and negative pressure conditions to the dilatation catheter; means for structuring the pump for accomplishing the double function of generating a positive pressure as well as a negative pressure in a closed hydraulic system between the pump and the dilatation catheter; mechanical drive means for driving said pump; said mechanical drive means comprises: a work cylinder; a work piston slidably arranged in said cylinder for carrying out forward and return strokes; said work piston having opposite faces; means for supplying and impinging opposite faces of said work piston with a pressurized medium; said pump comprising a piston pump having a piston rod; said mechanical drive means further including a piston rod provided for the work piston; said piston rod of the pump and said piston rod of said mechanical drive means being arranged essentially in alignment with one another; means for operatively coupling said piston rod of said pump and said piston rod of said mechanical drive means with one another; and said coupling means comprising a coupling body having a substantially dovetail-shaped groove provided at one of the piston rods and a fitting element having a cross-section corresponding essentially to said groove attached to the other piston rod.