JP2015136589A - reverse drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reverse drill capable of drilling a hole equal to or more than an outer diameter thereof in a rear side and selecting a drilled hole diameter by a hand operation.SOLUTION: A rotational shaft for a blade 3 having an eccentric shaft parallel to a central axis is established at a tip end of an inner shaft 2, and since a whole machine is forward rotated, the blade 3 is opened by friction and centrifugal force by hooking of a tip end slightly protruding from an outer diameter of an outer shaft 1. A tip end of a wedge shaft 4 having a fan-shaped cross section mounted to the inner shaft 2 serves as a spiral staircase shaped wedge to be gradually inserted into a rear part of the blade 3. A rotational screw feeding of a select handle 5 is shifted to a vertical movement of the wedge shaft 4, and a contact surface of the tip end of the wedge shaft 4 and the blade 3 is changed to be capable of selecting an opening/closing width of the blade 3.

Description

The present invention has a large five-stage rearward direction by pulling forward while rotating the machine forward through the pilot hole without rotating the blade with the blade closed from the state where the pilot hole is opened with an outer diameter size. It is a reverse drill for forming a radial drilling.

Conventionally, there are various cutting tools. Among them, a drill for drilling a bone often needs to have a special function because there are constraints such as being minimally invasive and being used in a limited space in the body.

For example, Patent Literature 1 discloses a method of forming a large-diameter perforation inside a joint and a cutting tool therefor by pulling it forward while rotating the cutting tool in an arthroscopic operation.

Japanese Patent Application No. 2011-170653

However, in the above prior art, only a drill having a certain diameter is created with a single tool, and in order to change the size of the drill, a corresponding tool must be selected each time.

The objective of this invention is providing the technique which solves the above-mentioned subject.

In order to achieve the above object, main components according to the present invention (cutting tool) are:
1, outer shaft 2, inner shaft 3, blade (blade) 4, wedge shaft (stopper having a spiral staircase with a fan-shaped cross section) 5, select handle 6, and O ring 6 parts.

1. The outer shaft has a scale on the outer diameter, confirms the position of the blade, and protects the inner shaft, the blade, and the wedge shaft.
2. The inner shaft is the central axis of the machine, the blade is stored with an eccentric shaft, the wedge shaft has a sliding groove, a selector device is mounted near the rear, and the rear 40 mm Grab the handle with the handpiece and rotate it.
3. In the blade, the tip of the blade protrudes slightly (0.1 mm) from the outer diameter of the machine at the storage stage, and the frictional force and centrifugal force when the blade rotates forward by having an eccentric shaft. Will open up to the selected position.
4. The wedge shaft has a spiral wedge at the front end and cooperates with the select handle at the rear.
5. The select handle consists of four parts, A positioning boss, B major, C select knob, and D torque knob, and selects the size.
6. O-ring confirms the blade position (drilling depth).

A blade storage space having an eccentric shaft with respect to the central axis is provided at the tip of the inner shaft, and the wedge shaft (stopper) having a spiral staircase shape is arranged at the rear of the blade. Determine the position, rotate it forward, open the blade using the centrifugal force and frictional force, pull the machine forward, and secure a large-diameter hole in the rear, and the width of the hole diameter It can be selected by operating the select handle.

According to the present invention, it is possible to select drilling with a plurality of diameters with this single tool.

It is a figure which shows the whole structure of this invention. It is a figure which shows the operation part structure of this invention. It is a figure which shows the front-end | tip part structure (state which the blade closed) of this invention. It is a figure which shows the structure (state which the blade opened in steps) of the front-end | tip part of this invention. It is a figure which shows the structure (state with the largest opening of a blade) of the front-end | tip part of this invention. It is a figure which shows the shape of the wedge shaft front-end | tip part of this invention, and a spiral staircase-shaped wedge.

1 Outer shaft 2 Inner shaft 3 Blade 4 Wedge shaft 5 Select handle 6 O-ring A Positioning boss B Major C Select knob D Torque knob

1 Outer shaft 2 Inner shaft 3 Blade 4 Wedge shaft 5 Select handle 6 O-ring
A Positioning boss
B Select knob
C major
D Torque knob

Claims (2)

Reverse drilling is performed by selectively fixing the opening of the blade by stepwise inserting a wedge stopper, which has a fan-shaped cross section in a spiral staircase shape, between the rear part of the blade (blade) and the storage wall. Reverse drill characterized by that. The tip of the blade protrudes slightly (0.1 mm) from the outer diameter of the machine at the storage stage, and the protruding portion is caught when the blade rotates forward by having an eccentric shaft parallel to the inner shaft. The blade can be greatly opened at a right angle to the central axis of the inner shaft, and the centrifugal force also works to open to the selected position. A reverse drill characterized in that the outer shaft holds (protects) the inner shaft and the wedge shaft.

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