Bone implant drill

Patent metadata

Field	Value
Publication number	US-9730772-B2
Application number	US-201514606106-A
Country	US
Kind code	B2
Filing date	Jan 27, 2015
Priority date	Sep 18, 2014
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A bone implant drill includes a bearing received in a sleeve. A transmission shaft includes a rod extending through the bearing and a transmission member formed on an end of the rod and received in the sleeve. The other end of the rod extends beyond the sleeve. A cutting rod includes a cutter, a coupling member received in the sleeve, and a positioning member between the cutter and the coupling member. The cutter and the coupling member are provided on two ends of the cutting rod respectively. The coupling member includes second teeth releasably engageable with first teeth on a free end of the transmission member. An elastic element is mounted in the sleeve. The elastic element includes a first end mounted around the coupling member and abutting the positioning member. The elastic element further includes a second end mounted around the transmission member and abutting the bearing.

First claim

What is claimed is:

1. A bone implant drill comprising:
a sleeve;
a bearing received in the sleeve;
a transmission shaft including a rod and a transmission member, with the rod extending through the bearing, with the transmission member formed on an end of the rod and received in the sleeve, with the transmission member including a free end with a plurality of first teeth, and with another end of the rod extending beyond the sleeve;
a cutting rod including a cutter, a positioning member, and a coupling member, with the cutter and the coupling member provided on two ends of the cutting rod respectively, with the positioning member located between the cutter and the coupling member, with the coupling member received in the sleeve, and with the coupling member including a plurality of second teeth releasably engageable with the plurality of first teeth; and
an elastic element mounted in the sleeve, with the elastic element including a first end mounted around the coupling member and abutting the positioning member, and with the elastic element further including a second end mounted around the transmission member and abutting the bearing.

2. The bone implant drill as claimed in claim 1 , with the bearing including an inner race and an outer race surrounding the inner race, with the outer race and the inner race rotatable relative to each other, with the rod extending through and coupled to the inner race, with the rod and the inner race jointly rotatable, and with the second end of the elastic element abutting the outer race.

3. The bone implant drill as claimed in claim 2 , with the transmission member having a diameter larger than a diameter of the rod, forming a shoulder at an interconnection between the transmission member and the rod, and with the shoulder abutting the inner race of the bearing and not abutting the outer race of the bearing.

4. The bone implant drill as claimed in claim 3 , further comprising a limiting ring, with the rod of the transmission shaft extending through and coupled to the limiting ring, with the rod and the limiting ring jointly rotatable, with the bearing restricted between the limiting ring and the transmission member, and with the limiting ring abutting the inner race of the bearing and not abutting the outer race of the bearing.

5. The bone implant drill as claimed in claim 2 , with the sleeve including a first end, with the first end of the sleeve being open, with the rod extending through the first end of the sleeve, with the sleeve further including an inner flange in the first end thereof, with the outer race of the bearing abutting the inner flange, and with the inner race of the bearing not abutting the inner flange.

6. The bone implant drill as claimed in claim 5 , with the sleeve further including a second end, with the second end of the sleeve being open, with the positioning member of the cutting rod connected to the coupling member, with the positioning member having a diameter larger than a diameter of the coupling member, forming a shoulder at an interconnection between the positioning member and the coupling member, with the cutting rod coupled to the second end of the sleeve by the positioning member, and with the first end of the elastic element abutting the shoulder.

7. The bone implant drill as claimed in claim 1 , with the plurality of second teeth meshed with the plurality of first teeth by rectilinear contact.

8. The bone implant drill as claimed in claim 7 , with the cutting rod and the rod coaxial to each other, with the plurality of first teeth surrounding and centered on an axis of the rod, with the plurality of second teeth surrounding and centered on an axis of the cutting rod, with each of the plurality of first and second teeth including decreasing widths from a root thereof towards a free end thereof and including an outer face and an inner face opposite to the outer face, and with the free end of each of the plurality of first and second teeth extending arcuately from the outer face to the inner face.

9. The bone implant drill as claimed in claim 8 , with the each of the plurality of first and second teeth further including two lateral faces connected between the outer face and the inner face, and with each of the two lateral faces inclining from the outer face towards the inner face such that the inner face is smaller than the outer face.

10. The bone implant drill as claimed in claim 1 , further comprising another bearing, with the bearing and the another bearing coaxial to each other, and with the transmission shaft extending through the bearing and the another bearing.

Assignees

• Metal Ind Res & Dev Ct

Inventors

• Tsai Tung-Lin
• Cheng E-Hsung
• Pan Bo-Wei
• Wang Pei-Hua

Classifications

• A61C1/18

  Flexible shafts; Clutches or the like; {Bearings or lubricating arrangements; Drives or transmissions}(flexible shafts in general F16C; clutches in general F16D) · CPC title

• A61B17/1695

  Trepans or craniotomes, i.e. specially adapted for drilling thin bones such as the skull · CPC title

• A61C8/0092 Primary

  for sinus lifting · CPC title