Apparatus for controlling drop-wise flow of fluid material
US4452273A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1982 |
| Grant date | Jun 5, 1984 |
| Priority date | — |
| Expiry date | Aug 12, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7759
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A flexible tube connected to a drop chamber is closed off by a clamping force applied by a pinch clamp. A cam which presses against the pinch clamp to initiate the drop-wise flow of a fluid forms an electrical contact with an extension of the clamp. Prior to the start of drop-wise feed when the cam and clamp are not in contact, the cam is driven toward the clamp at high speed until contact is made, at which point the drop-wise feed begins. At the instant of contact, a control signal is produced in response to which a speed changeover circuit is actuated to drive the cam at low speed, whereby control is executed in such a manner that the fluid drop rate gradually approaches a set drop rate at the low speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.