DE202004005657U1 - Surgical probe has outer sleeve surrounding a Vernier-calibrated stainless steel pin which is advanced through a pre-drilled hole - Google Patents

Abstract

A stainless steel needle probe has an outer sleeve with a conical tip to an outlet, and an internal plunger with a proximal Vernier scale and a rounded distal tip. The sleeve is presented against the outer face of the bone and the probe is then advanced through the drilled hole. The measurement is taken against the exposed Vernier scale.

Description

State of the art

In the care of broken bones in the Accident medicine is required after putting screw holes in the bone, the exact length of the drill channel to determine the appropriate osteosynthesis screw choose to be able to.

The length of the hole is in the Usually with only limited access bone surfaces by means of insertion determined by hooks in the drill channel.

The length measuring devices currently available consist of a probe hook, which on the rear part is provided with a scale and is inserted into a sleeve.

For the measurement, the probe hook is in inserted the screw hole and at the averted opening hooked. Subsequently becomes the sleeve advanced against the outer opening. The scale on the rear probe hook now shows the length of the extended probe hook according to the length of the drill channel.

problem

When retracting and hooking the probe hook at the averted opening of the channel, the hook often slides back into the drilling channel and one reliable Measurement of the channel length is difficult. The tip of the probe hook also gets caught light in the soft tissues surrounding the bone and shaft the tactile hook becomes common bent and breaks. The advancement and removal is also designed of the probe hook is often difficult due to snagging in the rough wall the bony Drilling.

solution

 The sensor presented is there from a probe hook with an eccentrically attached "hat" in the shape of a flat circular segment. This can be swung out in a placeholder. hereby is a smooth insertion of the device in the drilling channel and just as smooth swiveling for the purpose of Measurement of the channel length guaranteed. The placeholder prevents sliding back during the measurement of the probe hook in the hole and enables reliable hooking of the hat at their averted opening.

This is a quick and accurate Determine the length of the drilling channel possible.

design

The sensor consists of a placeholder ( 2 ), the measuring hook ( 6 ) with its hat-shaped tip ( 1 ) leads. In the front, thinner part ( 2a ) this happens in a gutter, in the rear, thicker part ( 2 B ) in a hole.

The placeholder and probe hook can be moved together in a sleeve that tapers in the front part ( 3 ).

At the rear end, the shaft of the probe hook has a square cross section ( 6a ) and is held with a clamping screw ( 5 ) in an equally square seat of a cam-shaped twist grip ( 4 ) fixed. The cam points in the same direction as the cap of the probe hook.

There is a metric scale on the surface of the placeholder in its thicker part ( 7 ) applied.

All Parts of the device are made of rustproof, sterilizable steel.

For the measurement of channel lengths bores with different diameters are more appropriate Sizes for Available.

handling

To measure the length of a drill channel in a bone ( 8th ) the probe hook, whose diameter was selected to be slightly smaller than the clear width of the hole, is swiveled over the placeholder. Together with the placeholder, the probe hook is inserted into the drill channel and pushed through. Now the hat-shaped tip is swiveled by 180 ° by turning the rear rotary handle. The resistance when the probe is withdrawn indicates that the probe is supported at the exit of the hole. Now the sleeve of the device is pushed against the entrance of the hole.

The length of the drill channel can be now on the scale of the rear portion read the placeholder in relation to the rear edge of the sleeve. This value corresponds to the length the extended portion of the probe hook together with the placeholder; ie .: distance C (see figure) corresponds to the value C read

Accordingly, the length of the osteosynthesis screw to be used.

During the measuring process, the tip of the cammed The position of the rotary handle due to its arrangement in the same direction eccentric hat of the Probe in relation to the placeholder.

After the measurement is finished the probe hook again by 180 ° in the starting position is pivoted back and the meter is removed. By the removal of the twist grip after loosening the clamping screw is that Device for cleaning and sterilization in all Individual parts can be dismantled.

1 : 1 shows the sensor in longitudinal section with the probe hook folded. The device consists of a sleeve ( 3 ), the placeholder with its front, thinner part ( 2a ) with a groove-shaped receptacle for the probe hook ( 6 ) and with his thicker part ( 2 B ) with a longitudinal bore and a scale ( 7 ). At the tip of the probe hook

Is the cone-shaped tip ( 1 ) and at the rear end is the square shaped shaft of the probe hook ( 6a ) in an equally square receptacle of the cam-shaped rotary handle ( 4 ) with a clamping screw ( 5 ) attached.

2 shows the cross-sections of the device in levels I to VI

2 : 3 shows the device in the drill channel of a bone ( 8th ) with the probe hook swung in

4 shows the device with the probe hook swung out during the measurement

• a corresponds to the diameter of the probe tip
• b corresponds to the width of the placeholder plus swung out top
• c corresponds to the length the extended placeholder and probe hook or the length of the drilling channel
• C corresponds to the measured value of the length of the drill channel
• d corresponds to the clear width of the drill channel

a <d

b> d

Advantages of the device

The sensor presented allows through the hat-shaped tip the smooth insertion of the probe hook in the drill channel. The same can be said of the tip their shape corresponding to a spherical segment after passing through Swing out the drilling channel smoothly.

The resulting increase in diameter the hook tip reliably supports the hook at the exit the bore and thus a quick and exact determination of the Length of Drill channel allows.

The placeholder also increases stability the feeler hook used in conventional devices is bent very easily in the course of handling and finally breaks.

Claims (1)

Sterilizable device made of stainless steel, consisting of a probe hook with a hat-shaped, a flat segment of a circle designed according to the is eccentrically guided in a placeholder via a cam-shaped twist grip can be swung out and which by scaling the rear portion the placeholder's length of drilling channels lets determine. The cammed Rotary handle shows the respective position of the eccentric cap of the Probe hook in relation to the placeholder by the position of the cam on.