Respiration monitoring apparatus and method
阅读：615发布：2024-02-24
专利汇可以提供Respiration monitoring apparatus and method专利检索，专利查询，专利分析的服务。并且Apparatus and method for monitoring the respiration of a patient through utilization of a force responsive transducer, which ideally is a capacitor transducer constructed from alternate layers of conductive and nonconductive materials that are flexible such that when placed beneath a patient or a resilient patient support, such as a mattress, the distance between the plates of the transducer changes for the purpose of producing electrical responses that upon amplification energize indicator means, such as a visual alarm or an audible alarm. The transducer is responsive to the vertical, reciprocating forces and motions caused by respiration and along with the associated circuitry, is sufficiently sensitive to energize an alarm upon sensing a cessation of respiration.，下面是Respiration monitoring apparatus and method专利的具体信息内容。
1. A system for monitoring the respiration of a patient comprising: a flexible force responsive capacitor means for placement beneath a patient or patient support for sensing the respiration of a patient, said capacitor comprising: three layers of flexible sheets of electrically conductive material, a flexible sheet of electrically non-conductive material located between adjacent sheets of conductive material to form alternate layers of conductive and non-conductive sheets of material, the outer conductive sheets being larger than the center sheet and having their peripherical edges substantially contiguous to each other so as to provide effective electrostatic shielding for the center conductive sheet, said flexible layers of conductive material being sensitive to changes in forces applied thereto and caused by the respiration of a patient, an electrical conductor connected to the center sheet of conductive material, an electrical conductor connected to the outer sheets of conductive material, and flexible non-conductive material surrounding and covering said outer layers of flexible sheets of conductive material, means connected to said conductors for applying a substantially constant voltage across said capacitor, and monitor means coupled to said capacitor means for monitoring the respiration of a patient.
2. A system for monitoring the respiration of a patient comprising: a capacitor transducer means capable of sensing force changes applied thereto and caused by the respiration of a patient, said transducer being a thin, flexible, pad-like member, comprising: a plurality of thin flexible layers of electrically conductive material including two outer layers, a thin flexible layer of electrically nonconductive material located between adjacent layers of conductive material to form alternate layers of conductive and nonconductive material, two electrical conductors connected to certain ones of said conductive layers to form a capacitor having two plate means, one of which includes the outer conductive layers of material electrically connected together, the other plate means being located between said outer conductive layers of material, the outer layers of said conductive material having their peripherical edges extending beyond said other plate means and substantially contiguous to each other so as to provide effective electrostatic shielding for said other plate means, and flexible electrically nonconducting material surrounding and covering said outer conductive layers said flexible layers of conductive material being sensitive to changes in forces applied thereto and caused by the respiration of a patient, means connected to said conductors for applying a substantially constant voltage across said capacitor transducer, and monitor means coupled to said capacitor transducer means for monitoring the respiration of a patient.
3. The system of claim 2 wherein said means for applying a substantially constant voltage across said capacitor supplies a substantially constant voltage of less than 25 volts D.C.
4. The system of claim 2 wherein said plurality of layers of electrically conductive material comprise an odd number of layers.
5. The system of claim 2 including the combination therewith of a memory system comprising: a lamp indicator means, circuitry means coupled to said capacitor transducer for periodically energizing said lamp indicator means to cause said lamp indicator means to flash on and off when respiration ceases, said circuitry including means for continuously energizing said lamp indicator means if respiration begins following cessation thereof.
6. The apparatus of claim 5 wherein said circuitry comprises: normally electrically nonconducting means coupled to said lamp indicator means and which is rendered electrically conductive by the application of a signal thereto and which remains in a conductive state following termination of said signal, a normally conducting mEans coupled to said normally nonconducting means for providing a flow path of energy from said normally nonconducting means, and oscillator means coupled to said normally nonconducting means and to said normally conducting means and responsive to cessation of respiration for producing periodic signals for rendering conductive said normally nonconducting means and for periodically rendering said normally conducting means nonconductive to periodically cause said lamp indicator means to flash on and off.
7. A system for monitoring the respiration of a person comprising: a capacitor transducer means capable of sensing force changes imparted to a mattress or the like due to the respiration of a person while supported by the mattress, said transducer being a thin, flexible, pad-like member comprising: alternate layers of thin flexible sheets of electrically conductive and nonconductive material forming a thin and flexible capacitor having a ratio of surface area in the plane of said pad-like member relative to its thickness through said sheets of greater than 500 to one, the number of layers of conductive material being greater than two, two electrical conductors connected to certain ones of said conductive sheets of material to form a capacitor having two plate means, one of which includes the outer conductive sheets of material electrically connected together, the other plate means being located between said outer conductive sheets of material, the outer layers of said conductive sheets of material have their peripherical edges extending beyond said other plate means and substantially contiguous to each other so as to provide effective electrostatic shielding for said other plate means, and thin flexible electrically nonconductive material surrounding and covering said outer layers of electrically conductive sheets of material, said flexible sheets of conductive material being sensitive to changes in forces applied thereto and caused by the respiration of a patient, means connected to said conductors for applying a substantially constant voltage across said capacitor transducer, and monitor means coupled to said capacitor transducer means for monitoring the respiration of a patient.
8. The system of claim 7 wherein the number of layers of conductive material comprise an odd number of layers.
9. A system for monitoring the respiration of a patient comprising the combination of: a capacitor transducer means capable of sensing force changes applied thereto and caused by the respiration of a patient, said capacitor transducer comprising a thin, flexible pad-like member including alternate layers of thin flexible sheets of electrically conductive and nonconductive material forming a thin and flexible capacitor having a number of layers of conductive material greater than two, two electrical conductor means connected to certain ones of said conductive sheets of material to form a capacitor having two plate means, one of which includes the outer sheets of conductive material electrically connected together and to one of said conductor means, circuitry means connected to said electrical conductor means and to be supplied with energy from a supply of electrical energy for producing a substantially constant voltage for application to said capacitor transducer, said circuitry comprising: regulator means for producing a regulated supply of voltage from said supply of electrical energy, and a field effect transistor connected in a source follower configuration and having its drain connected to the output of said regulator means; its gate connected to the other of said conductor means and hence to said other plate means of said capacitor transducer; its source connected to said one conductor means by way of a source biasing resistor and a load resistor; and a gate return resistor having one terminal connected to said gate and the other terminal connected to the juncture between said Source biasing resistor and said load resistor and monitor means coupled to the source of said field effect transitor for monitoring the respiration of a patient.
10. The system of claim 9 wherein said capacitor transducer means includes three conductive layers of material, the outer layers of conductive material being larger than the center layer and having their peripherical edges substantially contiguous to each other to provide effective electrostatic shielding for the center layer.
11. A method of monitoring the respiration of a person supported on a mattress or the like comprising the steps of: locating a capacitor transducer at a position sufficient to sense force changes imparted to the mattress caused by the respiration of the person while supported by the mattress, said capacitor transducer comprising: three layers of flexible sheets of conductive material, a flexible layer of non-conductive material located on opposite sides of the center sheet of conductive material, the flexible layers of non-conductive material on opposite sides of said center sheet of conductive material having their edges connected together forming an inner member having a covering of non-conductive material surrounding said center sheet of conductive material, an exterior flexible non-conductive layer of material covering the outward facing side of each of the outer sheets of conductive material, the exterior flexible non-conductive layers of material having their edges connected together forming an exterior covering of non-conductive material surrounding said outer sheets of conductive material with said inner member located between said outer sheets of conductive material, said outer sheets of conductive material being larger in their planes than said center sheet of conductive material and having their peripherical edges extending beyond the peripherical edges of said center sheet of conductive material so as to provide effective electrostatic shielding for said center sheet of conductive material, said flexible layers of conductive material being sensitive to changes in forces applied thereto and caused by the respiration of a patient, an electrical conductor connected to said center sheet of conductive material, and an electrical conductor connected to said outer sheets of conductive material, applying a substantially constant voltage to said two conductors and hence across said capacitor transducer, sensing capacitive changes between said layers of flexible sheets of conductive material due to force changes applied thereto due to the respiration of said person, converting said sensed capacitive changes into electrical responses, amplifying said electrical responses, and applying said electrical responses to a monitor means.
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