Identification method for the cuff size in a sphygmomanometer and flow restriction means required in identification
US5003981A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1989 |
| Grant date | Apr 2, 1991 |
| Priority date | — |
| Expiry date | Jul 6, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/0235
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention relates to an identification method for the cuff of a non-invasive automatic sphygmomanometer and to a flow restriction means for moderating the rate of pressure increase or decrease or both. Such a flow restriction means, which is fitted e.g. in a separate adapter (4), is useful particularly in connection with small-sized cuffs (6) intended for newborn babies. On the other hand, when using larger, such as adult cuffs, it is preferably to omit a flow restriction means completely. Identification is based on the fact that, when using a flow restriction means, either the increase of pressure downstream of a flow restriction means or the decrease of pressure upstream of a flow restriction means occurs slowly after the pumping is finished. If there is no flow restriction means at all, there will be no pressure change after the pumping is finished. Through the intermediary of a pressure sensing element (9), a control element (10) detects the size of a cuff. A flow restriction means of the invention comprises one or a plurality of orifices through which the flow to cuff (6) must pass. The diameter and the length of such an orifice and the number of orifices are dependent on …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.