Non-bubble forming dropper tip

Details Non-bubble forming dropper tip Non-bubble forming dropper tip

1998-04-22

2000-08-22

Kaufman, Joseph A.

Dispensing

Resilient wall

With flow controllers or closures

222420, B65D 3700

Patent

active

061058289

ABSTRACT:
A dropper tip which is adapted to be connected to a container for dispensing fluid, such as medications and like, from the container includes a body having first and second opposite ends and an inner wall defining a conduit therethrough. The inner wall smoothly diverges and gradually increases in inner diameter from the first end to the second end such that air bubbles are prevented from being permanently trapped along the inner wall. The inner wall is highly polished and may be made of olefinic material, silicone rubber material, or fluorocarbon, including, but not limited to, polytetrafluoroethylene (PTFE), carbon tetrafluoroethylene (CTFE), fluoroethylene propylene (FEP) or the like, to resist fluid wetting, facilitate fluid detachment therefrom and to reduce fluid film thickness therealong. The surface of the inner wall is smoothed to minimize surface roughness. A tubular portion having a flat end surface is provided at the first end of the body to promote limited momentary attachment of fluid thereto when fluid is being dispensed from the dropper tip. A sharp perimeter edge is provided by the flat end surface to provide an instant transition to discourage fluid wetting and migration beyond the designated perimeter of the flat end surface. A novel cap is provided for sealing the dropper tip from contaminants.

REFERENCES:
patent: 4568004 (1986-02-01), Goncalves
patent: 4938389 (1990-07-01), Rossi et al.
patent: 5125544 (1992-06-01), Millner et al.
patent: 5154702 (1992-10-01), Foyil
patent: 5769278 (1998-06-01), Kummer et al.
patent: 5906300 (1999-05-01), Horie
Adhesives Age, May 15, 1989, pp. 7-9.
Machinery's Handbook, "Surface Texture", Edition 24, pp. 671-674.
American Society for Testing and Materials, "Standard Test Method for Wetting Tension of Polyethylene and Polypropylene Films", pp. 1-3.
The Loctite Design Guide for Bonding Plastics, vol. 2, pp. 74, 79-81.

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