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External cardiac massage device

  • US 5,399,148 A
  • Filed: 12/31/1992
  • Issued: 03/21/1995
  • Est. Priority Date: 07/06/1990
  • Status: Expired due to Fees
First Claim
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1. An external cardiac massage device comprising a pneumatic pressure source, a valve switch means, and a depressor means, said pneumatic pressure source including a compressor means comprising a cylinder and piston reciprocally movable therein for providing a minimum pressure equal to atmospheric pressure,said depressor means including a reciprocating block adapted to be secured against the sternum of a patient for alternately depressing and releasing the sternum, yet maintaining a minimum residual pressure to depress the sternum beyond its rest position, a valve switch means connecting said depressor means to said pressure source for cyclically transmitting pressure from said pressure source to the depressor means for gradually increasing pressure to the depressor means over time in the first half of a cycle to a maximum pressure and decreasing at a like rate over the second half of a cycle,said valve switch means being located intermediate said compressor means and said depressor means for switching said compressor means between said depressor means and the atmosphere such that, at an adjustable point of each compression stroke of said piston, said compressor means is switched to said depressor means and, at the same adjustable point of each decompression return stroke of said piston, said compressor means is switched to the atmosphere.

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