Title:
経皮アクセス血流量の測定方法
Document Type and Number:
Japanese Patent JP2004524885
Kind Code:
A
Abstract:
Indicator dilution techniques are used to measure vascular access flow rates during routine hemodialysis. A bolus injection port is used to infuse a specific volume (Vi) of an indicator diluent, such as saline or dye, into the patient cardiovascular circuit by one of the following: 1. Needle injection of a known volume (bolus) of indicator diluent directly into the access site in the presence or absence of the hemodialysis circuit. 2. Infusion of an indicator diluent into the arterial, venous line upstream of the venous needle. 3. Turning the ultrafiltration of the dialysis delivery system from OFF to ON and OFF again over a predetermined time period. 4. In a hemodialysis circuit, turning on the hemodialysis pump and using the priming saline volume as a single saline bolus. A transdermal sensor is used to measure the percent change in a blood parameter. The sensor is positioned directly over the vascular access site a prescribed distance downstream of the injection site and upstream of the access-vein connection. The sensor employs emitter and detector elements at multiple spacings (d1, d2) for the purpose of measuring the bulk absorptivity (alpha) of the area immediately surrounding and including the access site, and the absorptivity (alpha0) of the tissue itself.
Inventors:
Stuart Robert Earl
Bell David A
Mirror david are
Bell David A
Mirror david are
Application Number:
JP2002554161A
Publication Date:
August 19, 2004
Filing Date:
December 20, 2001
Export Citation:
Assignee:
Hema Metrics Incorporated
International Classes:
G01F1/00; A61B5/026; A61B5/0275; A61M1/14; A61M1/36; (IPC1-7): A61M1/14; A61B5/026; A61B5/0275; G01F1/00
Attorney, Agent or Firm:
Minoru Nakamura
Fumiaki Otsuka
Sadao Kumakura
Shishido Kaichi
Toshio Imajo
Nobuo Ogawa
Village shrine Atsuo
Takaki Nishijima
Atsushi Hakoda
Fumiaki Otsuka
Sadao Kumakura
Shishido Kaichi
Toshio Imajo
Nobuo Ogawa
Village shrine Atsuo
Takaki Nishijima
Atsushi Hakoda