Multi-diameter drill bit

Patent metadata

Field	Value
Publication number	US-10413383-B2
Application number	US-201615738248-A
Country	US
Kind code	B2
Filing date	Jun 23, 2016
Priority date	Jun 23, 2015
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

A multi-diameter drill bit for implant bed preparation is provided. The drill bit has a drill shank that can be coupled with a driving tool to transfer drilling torques and forces to a drill body distal to the drill shank and a drill tip distal to the drill body. The drill body is divided into a first cylindrical portion having a first diameter and a second cylindrical portion having a second diameter. The drill tip is connected to the first cylindrical portion of the drill body and defines multiple first land areas and multiple cutting lips each at least partially bordering a respective first land areas. The second diameter is greater than the first diameter to define a plurality of faces of second lands at the interface between the first cylindrical portion and the second cylindrical portion, for reducing friction between the drill bit and surrounding bone tissue.

First claim

What is claimed is:

1. A multi-diameter drill bit for implant bed preparation, the multi-diameter drill bit extending longitudinally along an axis, the multi-diameter drill bit comprising:
a drill shank configured to be coupled with a driving tool used by an operator, the drill shank being proximal to an operating hand of the operator;
a drill body distal to the drill shank, the drill body comprising at least a first cylindrical portion and a second cylindrical portion, the first cylindrical portion having a first diameter, the second cylindrical portion having a second diameter, the first cylindrical portion being distal to the second cylindrical portion; and
a drill tip distal to the first cylindrical portion of the drill body, the drill tip defining a plurality of first land areas and a plurality of first cutting lips at least partially bordering the plurality of first land areas, respectively;
wherein the drill shank is configured to transfer drilling torques and forces generated by the driving tool to the drill body and the drill tip;
wherein the second diameter of the second cylindrical portion is greater than the first diameter of the first cylindrical portion to define a plurality of faces of second lands at the interface between the first cylindrical portion and the second cylindrical portion, wherein each of the plurality of faces of second lands is rounded in the direction of the longitudinal axis; and
wherein each of the plurality of faces of second lands comprises:
a second cutting lip,
a curved margin provided at the radial terminal end of the second cutting lip, and
a circumferential edge, wherein the circumferential edge is curved radially inwardly and continuous to the curved margin.

2. The multi-diameter drill bit according to claim 1 ,
wherein the drill body further comprises a third cylindrical portion proximal to the second cylindrical portion, the third cylindrical portion having a third diameter; and
wherein the third diameter is greater than the second diameter of the second cylindrical portion to define a plurality of faces of third lands at the interface between the second cylindrical portion and the third cylindrical portion, wherein each of the plurality of faces of third lands comprises a second curved margin.

3. The multi-diameter drill bit according to claim 2 , wherein each of the plurality of faces of third lands extends radially and circumferentially with respect to the axis.

4. The multi-diameter drill bit according to claim 2 , wherein each of the plurality of faces of third lands comprises a third cutting lip, wherein the second curved margin is provided at the radial terminal end of the third cutting lip.

5. The multi-diameter drill bit according to claim 2 , wherein each of the plurality of faces of third lands is rounded axially with respect to the longitudinal axis.

6. The multi-diameter drill bit according to claim 2 , wherein each of the plurality of faces of third lands comprises a second circumferential edge, wherein the second circumferential edge is curved radially inwardly and continuous to the second curved margin.

7. The multi-diameter drill bit according to claim 1 , further comprising:
a plurality of helical flutes starting from the drill tip and ending at the drill shank; and
a plurality of helical lands provided alternatively with respect to the plurality of flutes.

8. The multi-diameter drill bit according to claim 1 , wherein each of the plurality of faces of second lands extends radially and circumferentially with respect to the axis.

9. The multi-diameter drill bit according to claim 1 , wherein each of the plurality of the first cutting lips forms an angle with respect to the longitudinal axis of the stepped drill bit, the angle being in a range of 45° to 75°.

10. The multi-diameter drill bit according to claim 9 , wherein the angle formed by each first cutting lip and the longitudinal axis is 60°.

11. The multi-diameter drill bit according to claim 1 , wherein an angle formed between said circumferential edge and said curved margin is about 28°.

12. The multi-diameter drill bit according to claim 1 , wherein an angle formed between said circumferential edge and said curved margin is about 1° to about 45°.

13. The multi-diameter drill bit according to claim 1 , wherein the plurality of helical flutes comprise a uniform geometry from the drill tip to the drill shank.

Assignees

• Univ New York State Res Found

Inventors

• Abboud Marcus
• Rugova Sihana Hana

Classifications

• A61C3/02 Primary

  Tooth drilling or cutting instruments; Instruments acting like a sandblast machine · CPC title

• A61C8/0089

  Implanting tools or instruments · CPC title

• A61B17/1615

  Drill bits, i.e. rotating tools extending from a handpiece to contact the worked material · CPC title

• A61B17/1673 Primary

  for the jaw · CPC title