# US 5,342,195 A · Dental syringe tip and adaptor

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- Number: US 5,342,195 A
- Document ID: US5342195A
- Status: Granted
- Kind: A
- Application number: 08/004,098
- Filed: 1993-01-13
- Granted: 1994-08-30
- Earliest claimed: 1988-09-06
- Inventors: Warren Davis; David Wasserman; Richard R. Mathews
- Web page: https://patentgrep.com/patent/US5342195A

## CPC

- A61C 17/0202: {Hand-pieces}
- A61C: DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE (non-driven toothbrushes A46B; {tongue scrapers A61B17/24;} preparations for dentistry A61K6/00; preparations for cleaning the teeth or mouth A61K8/00, A61Q11/00)

## Abstract

Various adaptors are used for securing a replaceable syringe tip in operative relationship to a handpiece body. The syringe tip is mounted on a tapered male connector set in the hollow interior of the adaptor. O ring seals and a metal flange member are used to prevent the leakage of air or water passing from the handpiece into the interior of the adaptor and then into the syringe tip. A captivated thumb nut is utilized to prevent the thumb nut from accidently disengaging completely from the adaptor. When the thumb nut is loosened to replace a syringe tip, the thumb nut will remain captivated on the adapter, only loosening enough to allow removal and insertion of a syringe tip.

## Claims

### Claim 1

A syringe tip comprising an elongated cylindrical rigid plastic member having a first central water passageway throughout the entire length of the cylindrical member, said first central water passageway being generally circular in cross-section, and a plurality of second air passageways disposed in a regular pattern circumferentially about the first central water passageway, said second air passageways extending substantially the entire length of the tip and the combined cross-sectional areas of the second air passageways being at least 30% of the total cross-sectional area that would result if the second air passageways were a single continuous annulus completely surrounding the central water passageway.

### Claim 2 (depends on 1)

The syringe tip of claim 1 wherein the cylindrical member has a diameter in the range generally of 0.140"-0.150".

### Claim 3 (depends on 2)

The syringe tip of claim 2 wherein the cylindrical member has a diameter of approximately 0.145".

### Claim 4 (depends on 1)

The syringe tip of claim 1 wherein the first central passageway has a diameter in a range of generally 0.035"-0.039".

### Claim 5 (depends on 4)

The syringe tip of claim 4 wherein the first central passageway has a diameter of approximately 0.036".

### Claim 6 (depends on 1)

The syringe tip of claim 1 wherein there are six second passageways, each second passageway is generally circular and has a diameter in a range of generally 0.021"-0.024".

### Claim 7 (depends on 6)

The syringe tip of claim 6 wherein each second passageway has a diameter of approximately 0.022".

### Claim 8 (depends on 1)

The syringe tip of claim 1 wherein there are six second passageways and each second passageway is elliptical in shape and arranged radially to the central passageway.

### Claim 9 (depends on 1)

The syringe tip of claim 1 wherein there are six second passageways and each second passageway is elliptical in shape and arranged tangentially to the central passageway.

### Claim 10 (depends on 1)

The syringe tip of claim 1 wherein the elongated member is made of a plastic from the group consisting of polycarbonate plastic, nylon or Lexan.RTM..

### Claim 11 (depends on 10)

The syringe tip of claim 10 wherein the elongated member is transparent.

### Claim 12 (depends on 1)

The syringe tip of claim 1 wherein the elongated member is transparent.