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Mechanical pacemaker

  • US 4,265,228 A
  • Filed: 08/17/1979
  • Issued: 05/05/1981
  • Est. Priority Date: 09/14/1978
  • Status: Expired due to Term
First Claim
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1. A mechanical pacemaker for contacting the chest to provide cardiac stimulation, comprising:

  • a housing having a chest-contact surface, and a cavity with an opening in said chest-contact surface;

    an impact surface on one end of a plunger slidably mounted within said cavity such that a travel path for said impact surface is defined,said path extending outside said housing and through said opening and said impact surface being located outside of said housing at one end of said travel path and inside said housing at the other end of said path,said impact surface being shaped and sized to achieve deformation of the chest when travelling outside said housing;

    an impact means for driving said impact surface in discrete impacts that make and break contact with the chest,said impact means being operably connected to said impact surface by said plunger,said impacts being of a predetermined reproducible energy delivery selected to fail within an energy range, the lower end of said range being sufficiently high to achieve cardiac stimulation and the upper end being sufficiently low to avoid causing intolerable pain; and

    an electronic circuit means for actuating said impact means in response to the electrical output of a cardiac monitor, said actuation being synchronized to occur in a desired phase relation with the heart beat, to thereby produce a desired electrical ventricular response to the mechanical impacts.

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