Leak detector for detecting leak of liquid injected into blood vessel using pulse signal
US7546776B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 23, 2004 |
| Grant date | Jun 16, 2009 |
| Priority date | — |
| Expiry date | May 15, 2026 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/1588
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A leak detector sequentially emits pulse signals toward a human body at a position at which a needle is inserted, detects pulse signals reflected inside of the human body, and measures a time interval between the emission and the detection for each of the pulse signals. Then, the leak detector calculates the difference between the measured interval and a predetermined time interval, and generates a leak warning for notification when the difference exceeds an acceptable range. Since a swelling on the surface of the human body causes a path of the pulse signal to extend, the leak detector can detect, based on the extended signal path, that the needle has come off a blood vessel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.