Dispensing mechanism and method for delivering measured doses with slotted plunger
US5988452A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 1998 |
| Grant date | Nov 23, 1999 |
| Priority date | — |
| Expiry date | Jun 8, 2018 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/31593
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A dispensing mechanism for an applicator having a cylinder and a plunger. The plunger has a piston head slidable in liquid-tight manner within the cylinder. The plunger performs an expansion stroke to draw fluid into the cylinder and performs a compression stroke to dispense fluid from the cylinder. The dispensing mechanism includes a stop member attached to the cylinder of the applicator. The stop member has an engagement part extending toward the plunger. The plunger has at least one abutment formed on its surface for contacting the engagement part and limiting the motion of the plunger. Each abutment preferably comprises an end surface of a longitudinal groove formed in the surface. The engagement part tracks within the longitudinal groove and preferably limits the expansion stroke when the engagement part contacts the end surface. Each longitudinal groove is of a different length corresponding to a desired dose volume in the cylinder. The engagement part can track to a desired longitudinal groove through the circumferencial groove.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.