Sequential compression device
First Claim
1. A pressure generating device having a source of pressurized fluid for applying compressive forces against a patient'"'"'s limb through means of a flexible sleeve which encloses the limb and has at least one pressure chamber connectable with the source, in which the improvement comprises:
- means for sensing the pressure in the pressure chamber, said pressure sensing means including an electrical pressure transducer for generating an electrical signal in response to said chamber pressure exceeding a preselected value; and
means responsive to said electrical signal for depressurizing the chamber, said depressurizing means includinga valve connected with the source and connectable with the pressure chamber, said valve having one position in which the source is connected to the chamber and a venting position in which the source is not connected to the chamber and the chamber vents to a low pressure drain, such as atmosphere,means responsive to said electrical signal for generating a second electrical signal to cause said valve to switch to its venting position, andmeans for continuing generation of said second signal after termination of said first mentioned signal to maintain said chamber in a depressurized state.
3 Assignments
0 Petitions
Accused Products
Abstract
A pressure generating device for applying compressive pressures from a compressor against a patient'"'"'s limb through means of a flexible, pressurizable sleeve which encloses the limb having an overpressure circuit which causes venting of the pressurizable sleeve and termination of power to the compressor in the event of the pressure assuming an excessive value. The sleeve has a ventilation chamber and a controller which generates electrical signals to actuate a solenoid controlled valve to periodically connect the compressor to the ventilation chamber during cooling cycles.
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Citations
11 Claims
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1. A pressure generating device having a source of pressurized fluid for applying compressive forces against a patient'"'"'s limb through means of a flexible sleeve which encloses the limb and has at least one pressure chamber connectable with the source, in which the improvement comprises:
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means for sensing the pressure in the pressure chamber, said pressure sensing means including an electrical pressure transducer for generating an electrical signal in response to said chamber pressure exceeding a preselected value; and means responsive to said electrical signal for depressurizing the chamber, said depressurizing means including a valve connected with the source and connectable with the pressure chamber, said valve having one position in which the source is connected to the chamber and a venting position in which the source is not connected to the chamber and the chamber vents to a low pressure drain, such as atmosphere, means responsive to said electrical signal for generating a second electrical signal to cause said valve to switch to its venting position, and means for continuing generation of said second signal after termination of said first mentioned signal to maintain said chamber in a depressurized state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification