Surgery – Truss – Pad
Patent
1992-01-17
1995-10-03
Howell, Kyle L.
Surgery
Truss
Pad
128674, 128675, 73708, A61B 500
Patent
active
054543746
ABSTRACT:
A method and devices for measuring pressure within blood vessels used for hemodialysis and also for flow of blood into or from such blood vessels during hemodialysis. In one aspect of the method, a currently available hemodialysis set is used. This set comprises a tube (14) attached at one end to a hollow needle (12) and closed at the other end by a cap (19) which covers a proximal connector (18). The method comprises puncturing the blood vessel with the needle (12), measuring the distance to which blood flows under pressure into tube (14), calculating that pressure from that distance, and finally using the hemodialysis set for flow of blood in the performance of hemodialysis. In other aspects of the method, the improved devices of the invention are used. In one embodiment a proximal portion comprising a hollow needle (12), tube (14) with calibrated markings (16) and a proximal connector (18) are attached to a distal portion comprising a male connector (32) with lumen occluded by a hollow needle with a capillary lumen (34) and closed cylinder (24). The improvements in this embodiment increase the length of tube filled by blood and decrease the fluctuation in that length as a result of change in pressure between systole and diastole. In another embodiment a one-way flap valve (50) allows measurement of the maximum or systolic pressure within the blood vessel. In other embodiments pressure measurements are normalized for different atmospheric pressures at different altitudes. After the measurement of pressure, the needle, tube, and proximal connector are used for withdrawal or return of blood for a hemodialysis treatment.
REFERENCES:
patent: 3062202 (1962-11-01), Hyman et al.
patent: 3610230 (1971-10-01), Anderson
patent: 3690312 (1972-09-01), Leibensohn
patent: 3730168 (1973-05-01), McWhorter
patent: 3788132 (1974-01-01), Trimble et al.
patent: 3807389 (1974-04-01), Miller et al.
patent: 4282881 (1981-08-01), Todd et al.
patent: 4466804 (1984-08-01), Hino
patent: 4923442 (1990-05-01), Segall et al.
patent: 5088771 (1992-02-01), Hosseinian et al.
patent: 5163913 (1992-11-01), Rantanen-Lee et al.
Greenwood, Assessment of Arteriovenous Fistulae from Pressure and Thermal Dilution Studies, Clinical Nephrology, 1985, vol. 23, pp. 189-197.
Gani, Use of the Fistula Assessment Monitor to Detect Stenoses in Access Fistulae, American Jour. of Kidney Diseases, 1991, vol. 18, pp. 303-306.
Schwab, Prevention of Hemodiaysis Fistula Thrombosis, Early Detection of Venous Stenoses. Kidney International, 1989, vol. 36, pp. 707-711.
Dorrell, Dialysis Access Stenosis and Intra-Access Pressure, Journal of the American Society of Nephrology, 1991, vol. 2, p. 322.
Howell Kyle L.
Nasser Jr. Robert L.
LandOfFree
Pressure-measuring method and needle system for hemodialysis does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pressure-measuring method and needle system for hemodialysis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pressure-measuring method and needle system for hemodialysis will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1072357