Means for determining hemodynamic parameters during extracorporeal blood treatment
US5830365A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 25, 1996 |
| Grant date | Nov 3, 1998 |
| Priority date | — |
| Expiry date | Jul 25, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/929
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention relates to a means for determining hemodynamic parameters, such as cardiopulmonary recirculation, fistula flow and cardiac minute output during an extracorporeal blood treatment, in which blood is conducted to a dialyzer (3) by way of arterial branch (8, 8') of extracorporeal path (2) which is fluidly connected to a segment (9, 12) of a fistula (10), then returned by way of venous branch (11, 11') of the extracorporeal path which is fluidly connected to the other segment (12, 9) of the fistula. The hemodynamic parameters are determined by two recirculation fraction measurements taken in quick succession and which are performed automatically by the apparatus before and after the blood flow is reversed. In a computer-memory unit (22) cardiopulmonary recirculation is calculated based on the recirculation fraction during normal blood flow together with the recirculation fraction during reversed blood flow. To determine the recirculation fraction the concentration of an indicator solution is altered in venous branch (11, 11') of the extracorporeal path and the change in concentration of indicator solution resulting from recirculation in arterial branch (8, 8') of extracorp…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.