Drug infusion with pressure sensing and non-continuous flow for identification of and injection into fluid-filled anatomic spaces
US9956341B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 3, 2012 |
| Grant date | May 1, 2018 |
| Priority date | — |
| Expiry date | Jun 12, 2035 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/6045
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An automatic injection apparatus uses non-continuous fluid-flow of drugs to identify an intended injection site and includes a drive mechanism, a sensor and a controller for establishing fluid flow and pressure and preventing fluid flow until the pressure drops below a predetermined threshold. The pressure threshold is determined based on an internal pressure generated during an injection and more fluid will not flow until it drops below a predetermined pressure. An injection is performed to establish an initial pressure threshold and then to stop the fluid flow into a patient until the pressure drops below a predetermined pressure which allows fluid flow to resume, thus identifying a fluid filled tissue space. The initial pressure threshold is used as a control parameter to a microprocessor below which controls the rate of injection. Fluid flows below certain pressures are also used to identify a specific location within the body during injections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.