Apparatus and method for limiting free-flow in an infusion system
US5788674A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 5, 1996 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | Mar 5, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/60
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A detachable apparatus for limiting the rate at which a fluid is supplied to a patient by a positive pressure infusion device. The infusion device has an operating device pressure of at least approximately 2 psi. The apparatus includes a constrained flow segment (or CFS), coupleable to and detachable from the infusion device, for delivering fluid to the patient from the infusion device. The CFS has a length, an inside diameter, and a hydraulic resistance. The hydraulic resistance is a function of the length and inside diameter. When the apparatus is not in a free-flow condition, the CFS delivers fluid to the patient at a controlled flow rate determined by the operating device pressure and the hydraulic resistance of the CFS. When the apparatus is in a free-flow condition, the hydraulic resistance of the CFS limits a maximum flow rate of the apparatus to less than about 50% of the controlled flow rate. An adaptor is also provided for enabling a non-activating intravascular set ("IV set") to be used with an infusion device designed to be used only with an activating IV set. The infusion device has a detector element for detecting whether an IV set being used with the infusion device …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.