Circulatory assisted device with motor driven gas pump

A circulatory assist device, comprising:

• a shuttle gas source;
• a balloon catheter having a balloon associated therewith for inflation and deflation;
• a pump housing having an internally disposed pumping chamber of variable volume, said pump housing communicating with said balloon catheter and said shuttle gas source for priming said pumping chamber, said balloon catheter and said balloon with said shuttle gas;
• a diaphragm assembly for varying the volume of said pumping chamber to pressurize and depressurize said shuttle gas, said diaphragm assembly including a diaphragm having an outer periphery affixed to said housing, said diaphragm assembly further comprising a first pushing member and a second retaining member which sandwich said diaphragm;
• a reversible motor-driven actuator disposed in said housing for mechanically displacing said diaphragm assembly in a first pumping direction to decrease the volume of said pumping chamber to pressurize said shuttle gas to inflate the balloon, and in a second pumping direction to increase the volume of said pumping chamber to deflate the balloon, said motor-driven actuator including an elongated shaft, said shaft having said diaphragm assembly attached thereto, said shaft further having a threaded exterior portion;
• a planetary roller nut having an outer surface and a threaded internal portion for engaging said threaded exterior portion of said elongated shaft therein;
• and a motor for bidirectionally rotating said planetary roller nut to displace said shaft relative to said housing in said first and second pumping directions, said motor including a rotor coaxially disposed around and attached to said outer surface of said planetary roller nut;
• and
• a pump controller for storing a plurality of pump positions for said diaphragm assembly and for energizing said motor-driven actuator such that said motor-drive actuator displaces said diaphragm assembly between a balloon-deflate position and a balloon-inflate position at optimal time intervals for circulatory assist.

A circulatory assist device, comprising:

• a shuttle gas source;
• a catheter having an instrument associated therewith for inflation and deflation;
• a pump housing having an internally disposed pumping chamber of variable volume, said pump housing communicating with said catheter and said shuttle gas source for priming said pumping chamber, said catheter and said instrument with said shuttle gas;
• a diaphragm assembly for varying the volume of said pumping chamber to pressurize and depressurize said shuttle gas, said diaphragm assembly including a diaphragm having an outer periphery affixed to said housing, said diaphragm assembly further comprising a first pushing member and a second retaining member which sandwich said diaphragm;
• a reversible motor-drive actuator disposed in said housing for mechanically displacing said diaphragm assembly in a first pumping direction to decrease the volume of said pumping chamber to pressurize said shuttle gas to inflate the instrument, and in a second pumping direction to increase the volume of said pumping chamber to deflate the instrument, said motor-drive actuator including an elongated shaft having said diaphragm assembly attached thereto, said shaft further having a threaded exterior portion;
• a planetary roller nut having an outer surface and a threaded internal portion for engaging said threaded exterior portion of said elongated shaft therein;
• and a motor for bidirectionally rotating said planetary roller nut to displace said shaft relative to said housing in said first and second pumping directions, said motor including a rotor coaxially disposed around and attached to said outer surface of said planetary roller nut;
• and
• a pump controller for storing a plurality of pump positions for said diaphragm assembly and for energizing said motor-driven actuator such that said motor-drive actuator displaces said diaphragm assembly between an instrument-deflate position and a instrument-inflate position at optimal time intervals for circulatory assist.