JPS622007Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a probe in a root canal length measuring device that inserts a reamer into the root canal of a tooth and detects the insertion depth.

When treating a tooth, it is sometimes necessary to know the depth of the tooth's root canal, but for this measurement, one of a pair of electrodes is brought into contact with the oral mucosa (ground side), and the other electrode A device that inserts a reamer (non-grounded side) into the root canal and uses the fact that the impedance between both electrodes changes depending on the insertion depth to electrically detect the insertion depth is generally adopted. ing. Conventionally, root canal length measurement using such a device involves bringing the ground side electrode into contact with the oral mucosa by the patient or an assistant, while holding a reamer held by an electrode member such as an alligator clip at the tip of the non-ground side lead wire. This is done by the surgeon rotating the reamer around its axis and inserting the tip into the root canal, but since the reamer is rotated while being held in the alligator clip, the clip may break during the rotation process. There were problems in that if the reamer came off or if the clamping force of the clip was too strong, the reamer would not rotate as desired. In addition, the measurement probe consisting of the alligator clip and reamer occupies a considerable volume within the narrow space of the oral cavity.
Such operations performed within the oral cavity also caused considerable pain to the patient.

The present invention was developed in view of the above, and aims to provide a novel root canal length measuring probe that maintains stable attachment to the electrode member of the reamer, is miniaturized, and has excellent operability. .

An embodiment of the present invention will be explained based on the accompanying drawings. Fig. 1 is a partially cutaway perspective view showing a typical embodiment of the invention, Fig. 2 is a vertical cross-sectional view of the main part, and Fig. 3 is the same as Fig. 2. - line enlarged sectional view. That is, the present invention includes an electrode member 1 to which a non-ground lead wire a led out from a root canal length measuring device A is connected to the rear end, and a reamer 2 attached to the electrode member 1 and inserted into the root canal of a tooth.
In the dental root canal length measuring probe, the front end of the electrode member 1 is provided with a guide groove 11 into which the shank 21 of the reamer 2 can be inserted;
A fan groove 1 for reamer rotation continuous to the bottom of the guide groove 11
21 and 121 are arranged diagonally opposite each other to form a reamer holding hole 12 perpendicular to the guide groove 11,
In addition, a compression spring 3 is fitted onto the electrode member 1 so that the shank 21 of the reamer 2 fitted in the holding hole 12 can be pressed against the inner circumferential wall of the holding hole 12 to elastically hold it. This is a root canal length measurement probe. In the figure, an electrode member 1 is a columnar body made of a conductive material, and a spring-type blade terminal 13 is fitted to the rear end of the electrode member 1, and a plug terminal a connected to a lead wire a is attached to the blade terminal 13. ₁ is removably elastically fitted. This plug terminal _a1 is connected to the conductive plug base _a0 , and the lead wire a
The tip of the plug is fixedly connected to the plug base _a0 by soldering b. In addition, a compression spring 3 is fitted into the electrode member 1 from its distal end side, and the compression spring 3 is screwed and fixed to the peripheral body of the electrode member 1 at the rear end, while the other end is left free and is used for reaming. When electrode member 2 is not attached (no load), its free end is connected to electrode member 1.
It is selected so that it reaches almost to the vicinity of the tip. The reamer 2 is similar to that used in conventional root canal length measurement probes, and has an insulating knob 22 at the upper end.
A threaded portion 24 is formed by twisting from the shank 21 to the needle tip 23, and the operator holds the knob 22 and rotates it around the axis to remove the needle tip 23. is inserted into the root canal of the tooth. Although not shown in the figure, it is a matter of course that the root canal length measuring device A is connected to a ground electrode that is to be brought into contact with the patient's oral mucosa. X-ray television equipment to check the insertion depth of the
In combination with a CRT display device, etc. (see Utility Application No. 132225, filed by the applicant), or a measuring device using a commercial power source (see Utility Application No. 132225, filed by the applicant).
132224)).

In the root canal length measurement probe configured as described above, the reamer 2 is attached to the electrode member 1 by inserting the shank 21 of the reamer 2 into the guide groove 11 against the elastic force of the compression spring 3. This is done by turning the shank 21 at the bottom of the electrode member 1 by 90 degrees around the axis of the electrode member 1 and fitting it into the holding hole 12. Since the shank 21 fitted into the holding hole 12 is pressed against the inner circumferential wall of the holding hole 12 by the elastic force of the spring 3, the reamer 2 is stably held at the front end of the electrode member 1. Moreover, since the reamer 2 cannot be separated from the electrode member 1 unless it is turned 90 degrees in the opposite direction to the above, the reamer 2
Even when the shank 21 is rotated around its axis to be inserted into the root canal, the peripheral wall of the shank 21 simply slides and rotates between the inner peripheral wall of the retaining hole 12 and the end of the spring 3, which is different from the conventional alligator clip. Therefore, the reamer 2 does not come off from the electrode member during insertion, unlike when the reamer 2 is clamped. Particularly in the conventional method using alligator clips, the thicker the diameter of the reamer, the greater the influence of rotation, making it more likely that the reamer 2 will come off. There is no such concern regarding the attachment relationship between the reamer 2 and the electrode member 1, and the diameter range of the reamer 2 can be widened (for example, 0.4 to 1.5 mm), which allows the reamer 2 to be tailored to the symptoms of the affected area. This will also contribute to expanding the range of selection. Furthermore, since the probe itself is miniaturized and easy to operate, the patient's pain during measurement is alleviated, and it is extremely convenient for the operator. Furthermore, since the electrode member 1 and the lead wire a are detachable by the above-mentioned fitting means, not only the reamer 2 but also the electrode member 1 can be separated from the lead wire a for dry heat sterilization. , convenience is added in this respect.

In addition, when operating the above-mentioned probe, the surgeon operates by holding the knob 22 of the reamer 2, but there are also cases where it is necessary to hold the plug base a ₀ , so in order to maintain measurement accuracy. , the plug base
It is desirable to cover a ₀ with an insulating cover (not shown). In addition, although the free end of the compression spring 3 was selected above to reach the tip of the electrode member 1,
It suffices that they be located at least at a position that covers the opening of the holding hole 12, and these positions are appropriately selected in consideration of the elastic force of the spring 3, operability, and the like.

As described above, the root canal length measuring probe of the present invention has a very stable attachment of the reamer to the electrode member, and there is no risk of it coming off during operation, ensuring smooth treatment work, and is small and easy to operate.
It offers many advantages, such as being able to expand the range of reamer diameters and ensuring a variety of treatments.Furthermore, if the electrode member and lead wire are detachable, the electrode member can be dry sterilized separately.Taking all of these into consideration, it can be said that the usefulness of the root canal length measurement probe of this invention is extremely great.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing a typical embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of the main part, and FIG. 3 is an enlarged cross-sectional view taken along the line of FIG. 2. Explanation of symbols, 1... Electrode member, 11... Guide groove, 12... Holding hole, 121... Fan groove for reamer rotation, 13... Receiving blade terminal, 2... Reamer, 21...
Shank, 3... Compression spring, A... Root canal length measuring device, a... Lead wire, a ₁ ... Plug terminal.

Claims (1)

[Claims for Utility Model Registration] 1. An electrode member 1 to which a non-ground lead wire a led out from a root canal length measuring device A is connected to the rear end, and an electrode member 1 attached to the electrode member 1 and inserted into the root canal of a tooth. In a dental root canal length measurement probe including a reamer 2, the reamer 2 is attached to the front end of the electrode member 1.
The guide groove 11 into which the shank 21 can be inserted is recessed, and the fan grooves 121, 121 for reamer rotation connected to the bottom of the guide groove 11 are provided diagonally opposite each other so that the guide groove 11 is perpendicular to the guide groove 11. A compression spring 3 is attached to the electrode member 1 so as to form a reamer holding hole 12 and to press the shank 21 of the reamer 2 fitted into the holding hole 12 against the inner peripheral wall of the holding hole 12 to elastically hold it. A root canal length measuring probe characterized by being fitted with a canal. 2 A receiving blade terminal 13 is fitted to the rear end portion of the electrode member 1, while a plug terminal a ₁ that can be fitted and removed from the receiving blade terminal 13 is fixed to the tip of the lead wire a, and the electrode member The probe according to claim 1, wherein the probe 1 can be detachably connected to the lead wire a.