Title:
ULTRASONIC FLOWMETER AND BLOOD PURIFICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/078113
Kind Code:
A1
Abstract:
Provided is an ultrasonic flowmeter used in a blood purification device, that continuously measures the flowrate of fluid over a long period and maintains measurement precision even if the measurement environment changes. This ultrasonic flowmeter 1A is used in a blood purification device 100A and comprises: ultrasonic transmitter/receivers 10A, 10B that are in contact with and attached to the outside of a blood vessel 120; and a flowrate measurement circuit 20A that measures the flowrate of fluid. The flowrate measurement circuit 20A comprises: a transmission unit 21; a reception unit 22; a determination unit 24 that determines the timing at which a reference flowrate for the actual flowrate of fluid flowing along the blood vessel 120 is obtained; a flowrate calculation unit 25 that calculates flowrate on the basis of an ultrasonic signal that has been sent/received; a storage unit 26 that stores a reference flowrate Q０ calculated by the flowrate calculation unit 25 at the timing determined by the determination unit 24; and a calibrated flowrate calculation unit 27 that calculates a calibrated flowrate Q' calibrated on the basis of a calculated flowrate Q and the reference flowrate Q０.
Inventors:
MASAOKA KATSUNORI (JP)
OTSUKA KOJI (JP)
SAITO TERUHISA (JP)
OTSUKA KOJI (JP)
SAITO TERUHISA (JP)
Application Number:
PCT/JP2018/038114
Publication Date:
April 25, 2019
Filing Date:
October 12, 2018
Export Citation:
Assignee:
JMS CO LTD (JP)
SAGINOMIYA SEISAKUSHO INC (JP)
SAGINOMIYA SEISAKUSHO INC (JP)
International Classes:
G01F1/66; A61M1/36; G01F1/00
Foreign References:
| JP2008023269A | 2008-02-07 | |||
| JP2006343254A | 2006-12-21 | |||
| JP2008500553A | 2008-01-10 |
Attorney, Agent or Firm:
KATO Ryuta et al. (JP)
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