SUB-ATMOSPHERIC PRESSURE CHAMBER FOR MECHANICAL ASSISTANCE OF BLOOD FLOW
First Claim
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1. A subatmospheric pressure treatment device comprising:
- a chamber sized to receive an extremity of a subject, the chamber comprising;
a housing having an interior space and being so formed from one or more materials and so sized and shaped as to hold up to a subatmospheric pressure in the interior space of the chamber of at least 25 mmHg below an ambient pressure outside the chamber, the interior space being so sized and shaped as to receive the extremity of the subject;
an inlet communicating with the interior space of the chamber, the inlet so sized and shaped as to pass the extremity of the subject;
a flange attached to the chamber housing and defining the inlet, the flange comprising;
at least two supporting rings affixed to one another by at least one strut; and
a sleeve of material having two ends, each end mounted to a respective one of the supporting rings, the sleeve being;
so pliable as to;
form an air-tight seal around the extremity of the subject when the interior space of the chamber is at the subatmospheric pressure; and
exert essentially no pressure on the extremity of the patient when the interior space of the chamber is at the ambient pressure outside the chamber; and
so rigid as to resist involution into the interior space of the chamber when the interior space of the chamber is at the subatmospheric pressure;
a vacuum source communicating with the chamber, the vacuum source having sufficient capacity to produce the subatmospheric pressure in the interior space of the chamber;
a pulse sensor configured to produce a signal indicative of a pulse waveform representative of the subject'"'"'s pulse; and
a controller coupled to the vacuum source and to the pulse sensor and so configured as to command the vacuum source, in response to the signal indicative of the pulse waveform, to achieve the subatmospheric pressure in the interior space of the chamber.
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Abstract
A sub-atmospheric pressure treatment device may include a chamber, a vacuum source, a pulse sensor, and a controller.
43 Citations
20 Claims
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1. A subatmospheric pressure treatment device comprising:
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a chamber sized to receive an extremity of a subject, the chamber comprising; a housing having an interior space and being so formed from one or more materials and so sized and shaped as to hold up to a subatmospheric pressure in the interior space of the chamber of at least 25 mmHg below an ambient pressure outside the chamber, the interior space being so sized and shaped as to receive the extremity of the subject; an inlet communicating with the interior space of the chamber, the inlet so sized and shaped as to pass the extremity of the subject; a flange attached to the chamber housing and defining the inlet, the flange comprising; at least two supporting rings affixed to one another by at least one strut; and a sleeve of material having two ends, each end mounted to a respective one of the supporting rings, the sleeve being; so pliable as to;
form an air-tight seal around the extremity of the subject when the interior space of the chamber is at the subatmospheric pressure; and
exert essentially no pressure on the extremity of the patient when the interior space of the chamber is at the ambient pressure outside the chamber; andso rigid as to resist involution into the interior space of the chamber when the interior space of the chamber is at the subatmospheric pressure; a vacuum source communicating with the chamber, the vacuum source having sufficient capacity to produce the subatmospheric pressure in the interior space of the chamber; a pulse sensor configured to produce a signal indicative of a pulse waveform representative of the subject'"'"'s pulse; and a controller coupled to the vacuum source and to the pulse sensor and so configured as to command the vacuum source, in response to the signal indicative of the pulse waveform, to achieve the subatmospheric pressure in the interior space of the chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19)
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16. A subatmospheric pressure treatment device comprising:
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a chamber sized to receive an extremity of a subject, the chamber comprising; a housing having an interior space and being so formed from one or more materials and so sized and shaped as to hold up to a subatmospheric pressure in the interior space of the chamber of at least 25 mmHg below an ambient pressure outside the chamber, the interior space being so sized and shaped as to receive the extremity of the subject; an inlet communicating with the interior space of the chamber, the inlet so sized and shaped as to pass the extremity of the subject and to seal around the subject when the interior space of the chamber is at the subatmospheric pressure; a vacuum source communicating with the chamber, the vacuum source having sufficient capacity to produce a pressure in the interior space of the chamber that is at least 25 mmHg below the ambient pressure outside the chamber; a pulse sensor configured to produce a signal indicative of a pulse waveform representative of the subject'"'"'s pulse; and a microcontroller coupled to the vacuum source and to the pulse sensor and so programmed as to command the vacuum source, in response to the signal indicative of the pulse waveform, to achieve a pressure in the interior space of the chamber that is at least 25 mmHg below the ambient pressure outside the chamber.
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20. (canceled)
Specification