[특허]Patient controlled analgesia system

Patient controlled analgesia system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	A61M-005/00
출원번호	US-0551886 (1990-07-12)
발명자 / 주소	Boydman Scott A. (25447 Bryden Rd. Beachwood OH 44122)
인용정보	피인용 횟수 : 53 인용 특허 : 0

초록 ▼

A “dynamically”self-adjusting patient-responsive system for administering liquid medicine such as analgesia to patients as by infusion, with the “demand”of each patient for supplemental doses of drug being taken into account both in providing “on demand”“interval dosing”to supplement a “current rate”of background delivery of the drug to the patient, and in modifying the “current rate”of background delivery of the drug to more correctly correspond to the current needs of a particular patient. While “range”parameters (i.e., “limits”that define acceptable ranges of variance for various characteristics of a program of drug delivery that is intended to meet the very changeable current needs of a particular patient) are preset in accordance with the instructions of a physician, the hour-to-hour manner in which a drug is system-delivered to a particular patient principally is determined on a “dynamic”basis by the extent of the patient\s current “demand”for supplemental drug infusion. By requiring that a “target”level of patient “demand”be maintained in order for a current “dynamically determined” level of drug delivery to be maintained (e.g., a certain number of button presses by the patient per pre-set time interval must be kept up, otherwise the infusion rate will be diminished automatically), infusions are automatically reduced as a patient becomes sedated, as healing progresses, or as patient demand lessens for these and/or other reasons, whereby safety is enhanced and infusion is conformed to a minimum that is consistent with current needs of a patient, within physician-prescribed limits.

대표청구항 ▼

A method of administering liquid medicine such as analgesia to a patient as by infusion, comprising the steps of: a) providing dispensing means having a reservoir for liquid medicine such as analgesia, a tube for delivering the liquid medicine to a patient as by infusion, and pre-settable dispensing means for controllably dispensing a flow of the liquid medicine from the reservoir into the tube, with the pre-settable dispensing means including control means for being operated to input control commands to the pre-settable dispensing means so as to regulate the dispensing of the liquid medicine from the reservoir into the tube, with the control means further including a patient demand control that is operable by a patient who is to be infused with the liquid medicine to register a need felt by the patient for the flow of medicine to continue to be dispensed, and with the control means also being operable to record the operations of the demand control by the patient so that decisions concerning the flow of dispensed liquid medicine can be made based, at least in part, on the record of felt need that has been registered by the patient as by operating the demand control; b) dispensing liquid medicine from the reservoir through the tube for infusion delivery to the patient at an initial rate of flow, with the initial rate of flow residing within a predetermined range of acceptable flow rates that is bounded by an upper limit beyond which the dispensed flow rate is not to be permitted to rise, and by a lower limit beyond which the dispensed flow rate is not to be permitted to fall; c) determining a predetermined target number of operations of the demand control per unit of measured time that is to be utilized to maintain an existing rate of flow of liquid medicine dispensed through the tube, and maintaining the then existing rate of flow of liquid medicine being delivered as by infusion to the patient so long as the actual number of operations of the demand control per unit of measured time equals the predetermined target number; d) determining a first increment in rate of flow of dispensed medicine by which the existing flow rate of dispensed liquid medicine is to be increased in the event that the actual number of operations of the demand control per unit of measured time exceeds the target number by a first predetermined value, and, increasing the rate of flow of dispensed medicine by said first increment of flow rate in response to determining that the actual number of operations of the demand control per unit of measured time exceeds the target number by at least said first predetermined value; e) determining a second increment in rate of flow of dispensed medicine by which the existing flow rate of dispensed liquid medicine is to be decreased in the event that the actual number of operations of the demand control per unit of measured time falls short of the target number by a second predetermined value, and, decreasing the rate of flow of dispensed medicine by said second increment of flow rate in response to determining that the actual number of operations of the demand control per unit of measured time falls short of the target number by at least said second predetermined value; and, f) continuing to dispense liquid medicine to the patient for infusion as by periodically adjusting the existing flow rate of dispensed medicine if variances between the actual number of operations of the demand control per unit of measured time exceeds or falls short of the target number by said first and second values, respectively, but with increases and decreases in said flow rate of dispensed medicine being curtailed as may be necessary to maintain the existing flow rate at all times within a predetermined range of safe values for flow rates to be used in dispensing medicine to the patient; g) whereby, if the actual number of operations of the demand control per unit of measured time falls off due to sedation or diminished need of the patient, the flow rate at which medicine is dispensed to the patient by infusion likewise will diminish to insure safety and to conform the flow rate of medicine delivery to the minimal actual need of the client, but is maintained within said range of safe values for flow rates.

이 특허를 인용한 특허 (53)

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A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Patient controlled analgesia system 원문보기

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Patient controlled analgesia system 원문보기

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이 특허를 인용한 특허 (53)

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