JP5621079B1 - Reverse drill - Google Patents

Abstract

A reverse drill capable of drilling a hole having an outer diameter or larger rearward and selecting a drilling diameter by hand operation. A rotating shaft for a blade 3 having an eccentric shaft parallel to the central axis is constructed at the tip of the inner shaft 2 and the entire machine rotates forward so that the blade 3 is attached to the outer shaft 1 outside. It shall open by the friction and centrifugal force by the hook of the front-end | tip part which protruded slightly from the diameter. The tip of the wedge shaft 4 having a fan-shaped cross section mounted on the inner shaft 2 is a spiral staircase wedge for the purpose of stepwise insertion into the rear part of the blade 3 and the wedge of the rotary screw feed of the select handle 5 is wedged. It is characterized in that the opening / closing width of the blade 3 can be selected by shifting the vertical movement of the shaft 4 and changing the contact surface between the tip of the wedge shaft 4 and the blade 3. [Selection] Figure 1

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 Select knob
C major
D Torque knob

Claims (1)

An outer shaft that is cylindrical and has a blade opening and closing window at the tip;
An inner shaft inserted into the outer shaft;
A wedge shaft with a spiral staircase at the tip,
A blade having an eccentric shaft parallel to the central axis of the machine and protruding and retracting from the window at the tip of the outer shaft by centrifugal force and friction force;
Including a select handle,
The select handle has a function of axially moving the wedge shaft that is linked,
The wedge shaft that is linked by the operation of the select handle slides up and down in the outer shaft, so that the contact surface between the blade tail and the spiral stepped tip changes stepwise, A reverse drill characterized in that the protrusions and depressions of the blade are opened in stages in response to changes.

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