Single-needle circuit for circulating blood outside the body in blood treatment apparatus
US5227049A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1991 |
| Grant date | Jul 13, 1993 |
| Priority date | — |
| Expiry date | Aug 9, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/3386
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A blood treatment apparatus having a circuit for circulating blood outside the body and designed to be connected to a patient via a single needle, including a blood treatment device such as a heamodialyzer, pumps for causing blood to flow through the circuit, a first blood expansion chamber located in the circuit upstream of the blood treatment device for temporarily storing a volume of blood to be treated, a second blood expansion chamber located downstream of the blood treatment device for temporarily storing a volume of treated blood, first and second pressure regulators, connected to the first and second blood expansion chambers, for adjusting pressure in the blood expansion chambers, and a controller for interacting with the regulators to maintain a substantially constant pressure in each of the first and second chambers during a treatment session.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.