US RE40,814 E1
Oscillatory chest compression device
Nicholas P. Van Brunt, White Bear Lake, Minn. (US); and Donald J. Gagne, St. Paul, Minn. (US)
Assigned to Hill-Rom Services, Inc., Wilmington, Del. (US)
Filed on Jan. 14, 2002, as Appl. No. 10/55,849.
Application 09/039606 is a continuation of application No. 08/661931, filed on Jun. 11, 1996, granted, now 5,769,797.
Application 10/055849 is a reissue of application No. 09/039606, filed on Mar. 16, 1998, now 6,036,662, filed on Mar. 14, 2000.
Int. Cl. A61H 31/00 (2006.01)
U.S. Cl. 601—41  [601/44; 601/152; 601/DIG. 7; 601/DIG. 11] 118 Claims
OG exemplary drawing
 
[ 13. An apparatus for generating oscillatory air pulses in a bladder positioned about a person, comprising:
an oscillatory air flow generator comprising:
an air chamber;
a reciprocating diaphragm operably connected with the air chamber;
a rod having a first end and a second end, the first end operably connected with the diaphragm, and the rod extending generally orthogonal to the diaphragm;
a crankshaft operably connected with the second end of the rod and extending generally orthogonal to the rod; and
a first motor operably connected with the crankshaft;
a positive air flow generator operably connected with the oscillatory air flow generator;
a first feedback and control means operably connected with the oscillatory air flow generator for maintaining a frequency of the oscillatory air flow generator at a predetermined value; and
a second feedback and control means operably connected with the positive air flow generator for dynamically adjusting an output pressure of the positive air flow generator in order to maintain a positive pressure generated by the positive air flow generator at a predetermined value. ]