Intravenous (IV) infusion monitoring method and system
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01F-001/708
A61M-005/168
A61M-005/14
출원번호
US-0434466
(2013-10-30)
등록번호
US-9642966
(2017-05-09)
우선권정보
SG-201208063 (2012-10-31)
국제출원번호
PCT/SG2013/000466
(2013-10-30)
국제공개번호
WO2014/070112
(2014-05-08)
발명자
/ 주소
Lee, Freddie Eng Hwee
출원인 / 주소
Lee, Freddie Eng Hwee
대리인 / 주소
Wolf, Greenfield & Sacks, P.C.
인용정보
피인용 횟수 :
0인용 특허 :
10
초록▼
In a method of determining a flow rate in an intravenous fluid delivery system according to one embodiment of the present invention, the fluid delivery channel forms a segment of the intravenous infusion system. An input thermal signal is emitted into a source location of a fluid delivery channel at
In a method of determining a flow rate in an intravenous fluid delivery system according to one embodiment of the present invention, the fluid delivery channel forms a segment of the intravenous infusion system. An input thermal signal is emitted into a source location of a fluid delivery channel at an emitting instant. A first output thermal signal is received from a first sensor location of the fluid delivery channel at a first receiving instant. The first sensor location is positioned with a first interval downstream from the source location. The input thermal signal, the first output thermal signal, the emitting instant, the first receiving instant and the first interval define a first measured thermal profile. The first measured thermal profile is matched with a reference thermal profile which corresponds to a reference value, and the flow rate can be determined.
대표청구항▼
1. A method of determining a flow rate in an intravenous fluid delivery system, the method comprising: emitting an input thermal signal into a source location of a fluid delivery channel at an emitting instant, wherein the fluid delivery channel forms a segment of the intravenous infusion system; re
1. A method of determining a flow rate in an intravenous fluid delivery system, the method comprising: emitting an input thermal signal into a source location of a fluid delivery channel at an emitting instant, wherein the fluid delivery channel forms a segment of the intravenous infusion system; receiving a first output thermal signal from a first sensor location of the fluid delivery channel at a first receiving instant, the first sensor location being positioned with a first interval downstream from the source location, wherein the input thermal signal, the first output thermal signal, the emitting instant, the first receiving instant and the first interval define a first measured thermal profile, and matching the first measured thermal profile with a reference thermal profile provided in a matrix, wherein the flow rate is determined based on an algorithm that selects a closest resemblance between the first measured thermal profile and the reference thermal profile; wherein the first measured thermal profile includes at least one of a peak temperature amplitude, a first time period to reach the peak temperature amplitude, a second time period for a leading edge to reach a predetermined level of the peak temperature amplitude, and a third time period for a trailing edge to reach the predetermined level of the peak temperature amplitude;wherein matching the first measured thermal profile with a reference thermal profile comprising: locating in the matrix a first minimum upper time limit and a first maximum lower time limit within which the first time period fits; locating in the matrix an upper temperature value corresponding to the first minimum upper time limit and a lower temperature value corresponding to the first maximum lower time limit; locating in the matrix a second upper time limit corresponding to the first minimum upper time limit and a second lower time limit corresponding to the first maximum lower time limit; locating in the matrix a third upper time limit corresponding to the first minimum upper time limit and a third lower time limit corresponding to the first maximum lower time limit; deriving an upper total deviation based on a sum of a first upper time deviation, an upper temperature deviation, a second upper time deviation and a third upper time deviation, deriving a lower total deviation based on a sum of a first, lower time deviation, a lower temperature deviation, a second lower time deviation and a third lower time deviation, wherein the reference thermal profile is one corresponding to the lesser of the upper total deviation and the lower total deviation. 2. The method of claim 1, wherein the first upper time deviation is calculated from the first minimum upper time limit and the first time period, the upper temperature deviation is calculated from the upper temperature value and the peak temperature amplitude; the second upper time deviation is calculated from the second upper time limit and the second time period; the third upper time deviation is calculated from the third upper time limit and the third time period, the first lower time deviation is calculated from the first maximum lower time limit and the first time period, the lower temperature deviation is calculated from the lower temperature value and the peak temperature amplitude; the second lower time deviation is calculated from the second lower time limit and the second time period; the third lower time deviation is calculated from the third lower time limit and the third time period. 3. The method of claim 1, further comprising receiving a second output thermal signal from a second sensor location of the fluid delivery channel at a second receiving instant, the second sensor location being positioned with a second interval downstream from the first sensor location, wherein the second output signal, the second receiving instant and the second interval define a second measured thermal profile, and matching the first and second measured thermal profiles with the reference thermal profile. 4. The method of claim 3, further comprising receiving a third output thermal signal from a third sensor location of the fluid delivery channel at a third receiving instant, the third sensor location being positioned with a third interval downstream from the second sensor location, wherein the measured thermal profile being further defined by the third output thermal signal, the third receiving instant and the third interval, and matching the first, the second and the third measured thermal profiles with the reference thermal profile. 5. The method of claim 1, further comprising receiving a checking output thermal signal from a checking sensor location of the fluid delivery channel, the checking sensor location being positioned upstream from the source location, and comparing a temperature difference between the first output thermal signal and the checking output thermal signal with a trigger level to determine an occlusion situation. 6. The method of claim 1, further comprising receiving a checking output thermal signal from a checking sensor location of the fluid delivery channel, the checking sensor location being positioned upstream from the source location, and comparing a checking thermal profile established at the checking sensor location with the first measured thermal profile to determine an occlusion situation. 7. The method of claim 1, wherein the matrix includes a plurality of reference values within a first range, each reference value corresponds to a reference thermal profile established at the first sensor location. 8. The method of claim 7, wherein the matrix includes a plurality of reference values within a second range, each reference value corresponds to a reference thermal profile established at the first and the second sensor location. 9. The method of claim 1, wherein the algorithm includes identification of a match between at least the first measured thermal profile to the reference thermal profile specific for the first sensor location, such that a comparison between the first measured thermal profile and reference thermal profile is quantifiable. 10. The method of claim 1, wherein the first measured thermal profile is defined by parameters including the input thermal signal, the first output thermal signal, the emitting instant, the first receiving instant and the first interval, wherein the algorithm is to allow the parameters to adaptively contribute to the determination of flow rate such that one of the parameters applied to a corresponding determination changes with each successive step of receiving a first output thermal signal during the flow rate determining process.
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이 특허에 인용된 특허 (10)
Miller ; Jr. Theodore E. (Midland MI) Small Hamish (Midland MI), Apparatus for metering sub-10 cc/minute liquid flow.
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