Positive pressure respiratory apparatus Patent #: 4076021
ApplicationNo. 05/815659 filed on 07/14/1977
US Classes:128/205.18, Gas supplied by piston pump92/13.7, BY adjusting or limiting motion of relatively movable power transmission element92/13.8Adjustment means includes external axially extending threaded piston stem
ExaminersPrimary: Recla, Henry J.
Attorney, Agent or Firm
International ClassA61M 16/00 (20060101)
AbstractA piston type air pump, for forced lung ventilation, with a variable length of stroke and a variable timing of inspiratory and expiratory phases. The pump includes a stepless change, variable radius crank arm, controllable during pump operation for changing the volume capacity of the pump. The drive motor is arranged for movement for varying the timing of piston in-movement to the piston out-movement for varying the time ratio of inspiration to expiration.