JP4524448B2 - Attachment of medical rotary cutting tool - Google Patents

Description

  The present invention is an instrument for fixing and extending a medical rotary cutting instrument composed of a surgical drill bit and an orthopedic bar so as to be integrally rotatable, and is connected to a drive head of a handpiece in dental treatment or surgical treatment. It is related with the attachment used.

  In dental treatment, orthopedic treatment, etc., when an implant is placed in a bone, a hole having substantially the same shape as the implant is drilled in the bone. For example, in dental treatment, a drill 8 as shown in FIG. 5 is used to form an embedding hole for embedding an implant fixture in a jawbone. FIG. 6 shows a cross section taken along line XX of the drill of FIG.

  As shown in FIG. 5, a drill 8 that is conventionally used in dental treatment is a shank that is connected to a blade 81 for cutting a jawbone 9 and a drive head of a handpiece. Part 83 and a cylindrical main shaft 89 connecting between the blade part 81 and the shank part 83. The shank portion 83 is formed to have a size and shape conforming to a predetermined standard, and the rotation transmitting portion 85 having a substantially semicircular cross section for transmitting the rotational force from the handpiece, and preventing the handpiece from falling off. A drop-off prevention groove 87 is provided.

  As such a dental treatment drill, a drill having a comparatively short length is used from the viewpoint of preventing rotational blurring of the drill during treatment and reducing the burden on the patient opening. However, if the remaining teeth stick out adjacent to the implant fixture placement position, the head of the handpiece may come into contact with the remaining teeth during the procedure. In such a case, the length of the drill is extended. Therefore, it is necessary to avoid contact with the remaining teeth. Therefore, in such a case, a surgical drill attachment (drill extension) which is a dedicated instrument for extending the length of the drill is used.

  A conventional drill attachment includes a shank portion adapted to be connected to a handpiece, a sleeve into which a shank portion of the drill is inserted, and a drill inserted in the sleeve to fix the attachment to the attachment. Has a screw. The sleeve is formed with a screw hole through which the screw is screwed.

  In such a drill attachment, when the drill is fixed to the attachment, a screw is passed through a screw hole formed in the sleeve, and the screw is tightened to press the drill main shaft in the sleeve from the side at the tip. As a result, the drill in the sleeve is fixed to the side of the sleeve so as not to fall off due to the tightening force from the side by screwing.

  However, the above-described screw-type drill attachment has the following problems.

(1) First, since the conventional drill attachment employs a screwing method, assembly work and disassembly work using a tool such as a screwdriver are necessary, and the work is extremely complicated.

(2) Further, since the drill is fixed so that the drill is pressed from the side with a screw tip, an axial deviation occurs between the rotation axis of the attachment and the rotation axis of the drill. For this reason, there has been a problem in that the rotation of the drill occurs during the cutting operation, resulting in lack of cutting accuracy.

(3) Furthermore, since it is necessary to form a screw hole in the attachment, the sleeve becomes thick, and as a result, the outer shape of the attachment increases. For this reason, it is difficult for the practitioner to perform intraoral work, and for the patient, there may be pain when opening.

(4) Furthermore, medical instruments such as drill attachments need to be cleaned and sterilized by ultrasonic cleaning or the like every time they are used, but conventional drill attachments have a problem in their cleaning properties. That is, the sleeve portion of the conventional attachment is a so-called closed type in which only an insertion port for inserting a drill and a screw hole with a very small diameter are formed. Therefore, the cleaning action does not spread sufficiently to every corner in the sleeve, and there is a problem in the cleaning performance in the sleeve. In addition, the inner wall of the screw hole for fixing the drill has severe irregularities, and the cleaning and sterilizing action for such a portion is not sufficient. From this point of view, improvement of the cleaning performance of the drill attachment has been desired.

  In view of the problems of the prior art described above, the object of the present invention is easy to attach and detach, is excellent in operability, does not require a separate fixing member such as a screw, and is centered on the mounted rotary cutting instrument, An object of the present invention is to provide an attachment (surgical drill attachment) for a medical rotary cutting instrument that is excellent in cleanability and does not cause rotational shake.

  The above-described object is an attachment for fixing and extending a rotary cutting instrument for bone cutting so as to be integrally rotatable so that it can be connected to the handpiece for use in dental treatment or surgical treatment. And a holder part to which the rotary cutting instrument is detachably mounted. The holder part integrally has a gripping means for gripping the rotary cutting instrument. Achieved by the attachment you have.

  The holder part preferably has a substantially sleeve shape into which a shank part of a rotary cutting tool can be inserted, and the gripping means includes a slit formed in a substantially sleeve-like holder part, and the slit. It is preferable to include a plurality of gripping members that are adjacent to each other and are configured to grip the mounted rotary cutting tool.

  Moreover, it is preferable that the said holding means is further formed so that it may continue to the said slit, and contains the opening part for setting the holding force of the said holding member with respect to a rotary cutting tool to an appropriate degree.

  Furthermore, it is preferable that the plurality of gripping members are arranged at equal intervals in the circumferential direction of the holder portion so that the attached rotating cutting tool does not run out.

  Furthermore, it is preferable that the holder part has a magnetic member for magnetically fixing the mounted rotary cutting instrument.

According to the first aspect of the present invention, since the attachment is integrally provided with fixing means from the beginning, it is not necessary to prepare a separate fixing member (screw or the like) when the cutting tool is mounted. Also, when inserting / removing cutting tools, no tools such as a screwdriver are required, and assembling / disassembling can be done by simply inserting / removing them with the hand of the operator. Excellent in properties. In addition, since the operation time is shortened by improving the operability, the burden on the patient is reduced.
Further, in the case of the screwing method, since the cutting tool is pressed against the attachment from the side by the screw, the runout occurs. On the other hand, in the case of the present invention, since it is not necessary to apply a force from the side in order to hold the cutting tool in the holder, no runout occurs. Therefore, even if it is attached to the attachment, the cutting performance of the cutting tool does not deteriorate, so that a desired embedding hole or the like can be accurately formed in the bone.
Furthermore, since it is not necessary to provide a screw hole, the holder part can be made thin, and as a result, the external shape of the attachment can be reduced in size. As a result, the practitioner's intraoral work is facilitated and the burden on the patient who opens can be reduced.

  According to the second aspect of the present invention, since the sleeve-shaped holder portion has a slit structure, it is possible to ensure the flowability of the cleaning liquid during cleaning. Therefore, the inside of the holder can be reliably cleaned and sterilized. Moreover, since it does not have a screw hole that has a problem in cleaning performance, it can be said that it has excellent cleaning performance as compared with a conventional closed type attachment.

By providing the opening as in the third aspect of the present invention, the holding member can have an appropriate fixing force (elastic force) that does not hinder the operability when the cutting tool is inserted and removed, and This state can be maintained for a long time. The dimension / shape of the opening is determined by the operator's feeling of insertion / removal, the elastic limit of the gripping member, etc., taking into account various conditions such as the dimension / shape / material of the holder.
In the case where the opening is not provided, a high gripping force is maintained in the initial state, but the rigidity decreases with the insertion / removal of the cutting tool, which may cause a decrease in the gripping force over time. In addition, depending on the dimensions and material of the holder part, the operability at the time of mounting / removing the cutting tool may be hindered due to excessive rigidity.

  According to the fourth aspect of the present invention, since the plurality of gripping members are arranged at equal intervals in the circumferential direction of the holder portion, the cutting tool is arranged so that the rotation axis of the attachment and the rotation axis of the cutting tool coincide with each other. Can be held. As a result, the shaft misalignment in the mounted state is prevented, so that the rotational shake of the cutting tool can be reliably prevented.

  According to the fifth aspect of the present invention, it is possible to reliably prevent the cutting tool from falling off the attachment. In addition, since the magnetic attraction action works when the cutting tool is attached to the attachment, the cutting tool can be reliably set at a desired fixed position.

  The attachment of the present invention is an instrument for fixing and extending a rotary cutting instrument composed of a surgical drill bit and an orthopedic bar so as to be integrally rotatable, and is connected to a drive head of a handpiece in dental treatment or surgical treatment. Used.

Hereinafter, a dental treatment drill shown in FIG. 5 will be cited as an example of a rotary cutting instrument, and an embodiment of an attachment (drill extension) according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows an attachment 1 according to the present invention, and FIGS. 1A and 1B are a front view and a side view, respectively.
FIG. 2 is a bottom view of the attachment shown in FIG.
3 is a cross-sectional view taken along line VV in FIG.

The attachment 1 is made of martensitic stainless steel or the like, and connects the shank portion 3 provided on the upper end side, the drill holder (holder portion) 5 provided on the lower end side, and the shank portion 3 and the drill holder 5. A cylindrical main shaft 7 is integrally provided.
The shank portion 3 has the same shape and dimensions as the shank portion 83 of the drill 8 shown in FIG. 5, and is connected to the drive head of the dental handpiece during treatment.
The drill holder 5 has a substantially sleeve shape into which the shank portion 83 of the drill 8 can be inserted. The drill holder 5 is provided with a gripping means (slit structure) for gripping the drill 8 and is detachably mounted so that the drill 8 does not rotate relatively.

  An insertion path 51 in which the shank portion 83 of the drill 8 is inserted is formed on the lower end side of the substantially sleeve-shaped drill holder 5 (see FIG. 2). The insertion path 51 is formed to have a slightly smaller diameter than the main shaft 89 of the drill 8.

  Further, an inner space 53 that is a space that communicates with the insertion path 51 and that accommodates the shank portion 83 of the drill 8 is formed in the upper upper portion of the drill holder 5. In the inner space 53, a convex engagement portion 52 is formed for engaging with the rotation transmission portion 85 of the drill 8 and transmitting the rotational force from the handpiece to the drill 8. The engaging portion 52 is positioned at the notch portion 82 of the drill 8 in the drill mounting state, and is configured to interfere with the rotation transmission portion 85 of the drill in the drill rotation direction.

  Furthermore, the drill holder 5 is integrally provided with a gripping means (slipping structure) for gripping the drill 8 so as to prevent the drill 8 from falling off. In this embodiment, the gripping means includes slits (slots) 21 to 24 formed in the substantially sleeve-shaped drill holder 5, round holes 32 and 34 that are openings formed so as to be continuous with the slits, and slits. It comprises a plurality of gripping members 41 to 44 adjacent to each other.

  The plurality of gripping members 41 to 44 are formed at equal intervals, and play a role of gripping the attached drill 8 so that no runout occurs. In the present embodiment, as an example, four slits 21 to 24 are formed along the axial direction at intervals of 90 ° so that the four gripping members 41 to 44 are arranged at intervals of 90 ° (see FIG. 2). . And round holes 32 and 34 are formed in the upper end part of two slits 22 and 24 which oppose among four slits, respectively (refer to Drawing 1 (B) and Drawing 3). In addition, cleaning holes 31 and 33 are formed at the upper ends of the other two slits 21 and 23, respectively, for improving the cleaning performance inside the drill holder (see FIGS. 1A and 3).

  Inside the four gripping members 41 to 44, the cylindrical main shaft 89 of the drill 8 is gripped with an appropriate fixing force. Therefore, the diameter D (see FIG. 2) of the insertion path 51 surrounded by the four gripping members 41 to 44 is formed to be slightly smaller than the diameter of the main shaft 89 of the drill 8.

  As shown in FIG. 1B, the round holes 32 and 34 are formed at the upper ends of the slits 22 and 24 so as to be continuous with the slits. The round holes 32 and 34 function as elastic adjustment holes for setting the fixing force (elastic force) of the drill by the gripping members 41 to 44 to an appropriate degree.

  Although not shown, if necessary, the attachment 1 may be provided with a magnetic member for magnetically fixing the mounted drill 8 in order to supplement the fixing force by the gripping members 41 to 44. As a specific example of the magnetic member, a samarium cobalt-based magnet or the like can be given. Such a magnet may be provided, for example, at the upper end of the drill holder 5 (or the lower end of the main shaft 7). Thereby, since the upper end part of the drill 8 is magnetically attracted to the upper part of the drill holder, it is possible to more reliably prevent the drill 8 from falling off in cooperation with the fixing force by the holding members 41 to 44. Further, since the magnetic attraction action works when the drill 8 is attached to the attachment 1, the drill 8 can be reliably set at a desired fixed position.

  Next, based on FIG. 4, the insertion / removal procedure of the drill 8 with respect to the attachment 1 which has the structure mentioned above is described. 4A shows a procedure for attaching the drill 8 of FIG. 5 to the attachment 1 of FIG. 1, and FIG. 4B shows the attachment 1 with the drill 8 attached.

  When the drill 8 is attached to the attachment 1, the shank portion 83 of the drill 8 is inserted into the drill holder 5 through the insertion path 51 as shown in FIG. At that time, by pushing the upper end of the drill 8 into the insertion path 51, the gripping members 41 to 44 are slightly elastically deformed in the radial direction, and the diameter of the insertion path 51 is increased. Then, when the drill 8 is pushed against the frictional resistance generated between the gripping members 41 to 44 and the elastic force of the gripping member, the shank portion 83 of the drill passes completely through the insertion path 51 into the drill holder 5. Is housed in.

  After the mounting, the engaging portion 52 protruding in the lateral direction in the inner space 53 of the drill holder 5 and the rotation transmitting portion 85 of the drill engage with each other in the rotating direction (mutual interference), so that the drill 8 is idle with respect to the attachment 1. The rotational force from the handpiece is reliably transmitted to the drill 8 via the attachment 1. In addition, frictional resistance is generated between the gripping members 41 to 44 and the drill 8 and the gripping members 41 to 44 press the main shaft of the drill in the centripetal direction by a fixing force accompanying elastic deformation. Will not fall off attachment 1.

  When removing the drill 8 from the attachment 1, the shank portion 83 of the drill 8 can be extracted from the drill holder 5 by pulling the drill 8 in the axial direction against the fixing force and frictional resistance of the gripping members 41 to 44. it can. When completely extracted, the gripping members 41 to 44 return to the original shape, and the insertion path 51 is reduced in diameter to the original dimension.

  When cleaning the attachment 1, the drill 8 is removed by the above procedure, and each is ultrasonically cleaned. In the ultrasonic cleaning process, the cleaning liquid spreads through the insertion path 51, slits 21 to 24, cleaning holes 31 and 33, and round holes 32 and 34 to every corner of the drill holder 5, and the entire attachment 1 is cornered. A sufficient cleaning effect is exhibited. As described above, the attachment of the present invention has excellent cleaning properties as compared with the conventional closed type attachment, and the inside of the holder as well as the outside of the attachment can be reliably cleaned.

As mentioned above, although this embodiment demonstrated the case where the drill for dental treatment was mounted | worn with an attachment, this invention is not limited to this. For example, it can also be used when a drill used for placing a surgical implant is attached.
Moreover, the form of the attachment of the present invention is not limited to the above-described embodiment and the aspect shown in the drawings. For example, in consideration of mounting a drill with a water injection function, cooling water is supplied from the handpiece. A water injection hole (through hole) may be formed along the axis of the attachment.

1 shows an attachment of the present invention, and FIGS. 1A and 1B are a front view and a side view, respectively. It is a bottom view of the attachment shown in FIG. It is sectional drawing along the VV line of FIG. FIG. 4A shows a procedure for mounting the drill of FIG. 5 on the attachment of FIG. 1, and FIG. 4B shows the attachment in a state where the drill is mounted. It is a figure which shows the drill generally used in the dental treatment. FIG. 5 shows a cross section along the line XX of the drill of FIG.

Explanation of symbols

1 Attachment (drill extension)
3 Shank part 5 Drill holder (holder part)
7 Spindle 8 Dental treatment drill (rotary cutting tool)
9 jawbone 21 slit
22 slits
23 Slit (Slit)
24 slits
31 Cleaning hole 32 Round hole (opening)
33 Cleaning hole 34 Round hole (opening)
41 Grasping member 42 Grasping member 43 Grasping member 44 Grasping member 51 Insertion path 52 Engagement part 53 Inner space 81 Blade part 82 Notch part 83 Shank part 85 Rotation transmission part 87 Fall-off prevention groove 89 Spindle

Claims (1)

An instrument used in connection with a handpiece in dental or surgical treatment,
In the attachment (1) for fixing and extending the rotary cutting tool (8) for bone cutting provided with the rotation transmission part (85) so as to be integrally rotatable,
A shank part (3) connected to the handpiece;
A holder part (5) to which the rotary cutting tool (8) is detachably mounted;
An engaging portion that engages with the rotation transmitting portion (85) of the rotary cutting instrument (8) in the rotation direction without applying a force from the side to the rotary cutting instrument (8) mounted on the holder portion (5). (52)
Cleaning holes (31) (33) formed so as to penetrate the holder part (5),
A gripping means (41) (42) (43) (44) for gripping the rotary cutting tool (8) formed on the holder portion (5), having a slit structure, and causing no runout.
Attachment of medical rotary cutting tool, characterized in that it comprises a.

Images