JPH08154951A - Medical handpiece having planar part at upper hand side part - Google Patents

Abstract

PURPOSE: To provide a medical handpiece which secures the setting of an angle of a device accurately while being excellent in gripping property to reduce fatigue of a user addressing higher accuracy of medical treatment and higher performance of the handpiece. CONSTITUTION: This apparatus comprises a handpiece head part for mounting a medical treating device and a grip part which is linked to a shaft of the treating device of the head part in the direction almost vertical thereto while the grip part is divided into an upper side part 1, a medium side part 2 and a lower side part 3 as viewed in the direction of the shaft of the treating device. In a medical handpiece thus arranged, linear upper hand side parts 12 and 13 are set to place and hold a finger tip thereon accurately by expanding the top part 11 of the upper side part both to the right and left.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a novel appearance structure which is excellent in gripping property and can perform accurate treatment by setting the angle of a medical treatment tool (cutting tool etc.) to a predetermined angle. And a medical handpiece having

[0002]

2. Description of the Related Art Medical handpieces of this kind are used in orthopedic or plastic reconstruction surgery in surgery (for example, brain surgery, orthopedics, oral surgery, otolaryngology, etc.). Widely used for opening, cutting, cutting and polishing. Taking a dental handpiece as an example for convenience of explanation, it has a structure as shown in FIG. 1 which is referred to for explaining the present invention. That is, a dental handpiece, for example, an air turbine type dental handpiece (A) has a head portion (H) containing a pneumatic drive unit for driving a tooth treatment tool (T), and a tooth portion from the head portion (H). The treatment tool (T) is composed of a grip portion (grip portion) (G) connected in a direction substantially perpendicular to the axis of the treatment tool (T).

Inside the grip portion (G), a duct for supplying or discharging pressurized air, which is a driving medium of the dental treatment device (T), a duct for injecting water into the tooth treatment portion, It goes without saying that various ducts (pipe lines) such as an optical system duct for illuminating the dental treatment part are provided.

In this type of dental handpiece,
Along with the advancement of dental treatment or the high performance of the handpiece itself, a high degree of precision and handleability are required. More specifically, in terms of dental care, for example, in any part of a tooth restoration or prosthesis (and thus at any angle).
On the other hand, there is a demand for treatment of a very small portion (thus an accurate portion), and a precise operation of a tool (cutting tool etc.) is required. Further, in terms of improving the performance of the handpiece itself, for example, in terms of the rotational speed of the tool, the conventional level of 200,000 to 350,000 rpm has shifted to the level of 35 to 500,000 rpm. There is a further demand for accuracy in tool operation. Note that the present inventors have previously proposed the latter method of improving the performance of the handpiece itself (for example, Japanese Patent Application No. 6-36404), and the motivation for the present invention comes directly from the earlier proposal. Is what is emitted.
That is, the demand for safe operability of the handpiece in this kind of high-speed rotation region compels the review of the prior art.

In order to improve the operability of the dental handpiece, a dental handpiece having a grip portion (G) having a special external shape has been proposed. For example, the actual Kaihei 6-3
Japanese Patent No. 1709 discloses a dental rotary cutting instrument in which the angle of a dental treatment tool (tool) can be set not only by visual inspection but also by the feeling of a finger when grasping a grasping portion. What has been described above is to provide flat surfaces parallel to the axial direction of the cutting bar (tool) on both sides of the gripping portion, and to configure a gripping portion having a cross-sectional shape different from that of a substantially circular shape. It is adopted.

The specific cross-sectional shape of the gripping portion disclosed in Japanese Utility Model Laid-Open No. 6-31709 is shown in FIG. 4 (1) to 4 (3) show various sectional shapes. That is, the plane parallel to the axial direction of the tool described above is shown by 4 in the figure. In the above publication, the shape of the upper surface portion (5) is a curved upward convex shape (see FIGS. 4A and 4B) and a part thereof is horizontal (FIG. )) Are disclosed respectively.

However, the above-mentioned actual Kaihei 6-31709
In the dental handpiece disclosed in Japanese Patent Publication, the operability of the handpiece, the gripping property, and the accurate setting of the tool angle, which are required under the above-mentioned advanced dental treatment and high performance of the handpiece itself, are set. It does not satisfy the requirements such as sex.

[0008]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention solves the problems of the prior art described above. The present inventors have made studies to solve the above problems. As a result, especially in the case of a medical handpiece with a high rotation speed, in order to reliably set and maintain the set position of the treatment tool (tool) at a desired angle, flat inclined parts are arranged on both sides of the upper edge of the grip part. More precisely, it is extremely important that the cross-sectional shape of the gripping portion is expanded to the left and right sides of the apex of the upper side to provide a straight upper side to securely place and hold the fingertip. I found something. The present invention has been completed based on the above findings, and according to the present invention, not only the gripping property but also the angle of the tool can be set and reliably held at a desired position, and the fatigue level of the user can be reduced. An excellent medical handpiece is provided.

[0009]

The present invention will be summarized as follows.
The present invention, in a medical handpiece consisting of a handpiece head part for mounting a medical tool and a gripping part that is connected in a direction substantially perpendicular to the treatment tool axis of the head part,
(i) The gripping portion, when viewed in the direction of the treatment tool axis, is an upper side portion,
It is configured by being divided into a middle side portion and a low side portion, and (ii) the upper side portion has, in a sectional shape, an upper side apex portion which is a straight line perpendicular to the treatment tool axis or a curved upward convex shape, and the upper side apex portion. And has a linear upper side portion that is spread and connected to both left and right sides of (iii) the middle side portion is vertically or contracted downward from both end portions of the upper side portion in a cross-sectional shape. It is configured by having a straight or curved middle side portion in the closing direction, and (iv) the bottom portion has a linear or curved shape in cross-sectional shape from both ends of the middle side portion. The present invention relates to a medical handpiece having a flat side portion on the upper side portion, characterized in that it is configured to have a bottom side portion that contracts and closes.

The technical configuration and embodiments of the present invention will be described below in detail with reference to the drawings. For convenience of explanation, a dental handpiece will be continuously described as an example as a medical handpiece. Needless to say, the present invention is not limited to the illustrated one.

FIG. 1 is a perspective view of a dental handpiece (A) having a flat surface portion on the upper side of the present invention. As shown in the figure, a dental handpiece (A) includes a head portion (H) for mounting a tooth treatment tool (such as a cutting tool) (T), and a tooth treatment tool (T) for the head portion (H). The grip portion (G) is connected in a direction substantially perpendicular to the axis. In the dental handpiece (A) of the present invention, the greatest characteristic point is the configuration of the sectional shape of the grip portion (G). The characteristic point is also shown in FIG. 1, but more specifically, it is shown in FIGS. 2 to 3 which is a sectional view taken along the line I-I of FIG. 1.

FIG. 2 is a view for explaining the structure of the grip portion (G) according to the first embodiment of the present invention. The gripping part (G), which is a main component of the dental handpiece (A) of the present invention, has an upper side part (1), a middle side part (2), and It is composed of a divided area of the bottom portion (3). Incidentally, these divided areas may be integrally molded by injection molding with synthetic resin or the like.

The important technical structure of the grip portion (G) of the present invention lies in the area of the upper side portion (1). That is,
In the present invention, the upper side part (1) of the gripping part (G) has a linear upper side apex part (11) perpendicular to the axis of the treatment tool (T) and the upper side apex part (11) in its sectional shape. A straight upper side that is spread and connected to both left and right sides (1
2, 13). In other words, the cross section of the upper side portion (1) is trapezoidal. Usually, this kind of dental handpiece is held by a pen grip. Then, the dental handpiece is used with the head (H) being displaced at a desired angle around the axis of the grip (G) according to the treatment site. In view of the above-described use mode, the dental handpiece of the present invention has the straight upper side portions (12, 13) when the angle of the head (H) is displaced (when the tool angle is displaced). ), The operability of the handpiece is significantly improved because the fingertip of the index finger can be reliably fixed and held on the upper side portion. Further, the tool angle can be kept constant by using the inclination angle of the portion as a guide.

In the grip portion (G) of the present invention, the other portions, that is, the middle side portion (2) and the bottom side portion (3) are, for example, as follows in consideration of the gripping property and the angle adjustment of the tool. Just configure it. That is, the middle side portion (2) is composed of the middle side portions (21, 22) which are linear in the vertical direction downward from both ends of the upper side portions (12, 13) as shown in the figure. Further, the bottom portion (3) is constituted by bottom side portions (31, 32) which are linearly contracted from both ends of the middle side portion (21, 22) as shown by solid lines in the figure. Note that FIG.
Includes a modified example indicated by a dotted line as the bottom side portion. That is, the bottom part (3) may be a bottom side part (31 ') which is convexly curved downward from both ends of the middle side part (21, 22) as shown by the dotted line. .

The size of the cross-sectional shape of the grip portion (G) of the present invention varies depending on the position of the cross section of the line I-I as shown in FIG. 1, but the height (h) is about 9. 5 mm,
The width (W) is about 9.0 mm. Then, the height (h ₁ , h ₂ , h ₃ ) and width (W ₁ , W) of each part shown in the figure
₂ ) may be selected appropriately.

FIG. 3 is a view for explaining the structure of the grip portion (G) according to the second embodiment (solid line portion) of the present invention.
The major differences from the first embodiment (see FIG. 2) are (1) the upper side apex (11) is curved upwardly, and (2) the middle side (21, 22). ) Is the upper side (12,
13) the points which are curved from both ends, and (3) the bottom side (31) is the middle side (21, 2).
The point is a curved line that contracts from 2). In addition, a straight upper side part (12, 13) on both sides of the upper part
Is the same as the first embodiment.

Incidentally, FIG. 3 includes a modification shown by a dotted line. That is, as disclosed, instead of the curved middle side portions (21, 22), the straight middle side portions (21, 22) are
′, 22 ′) and a convex bottom side portion (3
1) Straight side bases (31 ', 32)
´) is also good. In this case, for example, in the treatment of the lingual side of the lower anterior tooth, it is necessary to grasp the tip of the treatment tool (T) of the dental handpiece so as to face upward. 31, 32) can play the role of the upper side (12, 13).
Then, in the second embodiment, the height (h) and width (W) of each portion may be appropriately selected as described above.

[0018]

INDUSTRIAL APPLICABILITY In the medical handpiece of the present invention,
The gripping part, which is the main component, reduces the fatigue level of the user and, in order to improve the gripping property, further facilitates the setting of the angle of the treatment tool to a desired one, and with a light force. It is composed of one having a specific appearance structure for easy holding. In particular, the upper side of the gripping part is divided into an upper side apex and an upper side side connected to the upper side apex, and the upper side apex is constituted by a flat surface or a curved surface perpendicular to the axis of the tool, and the upper side. The part is constituted by connecting planar inclined surfaces to both sides of the upper side part.

Therefore, by grabbing the gripping portion and disposing the fingertip of the index finger on the plane inclined surface (upper side portion), the angle of the tool axis can be easily recognized and displaced in both left and right directions. . Further, the angle of the tool axis can be finely adjusted by using the inclination angle of the flat inclined surface (upper side portion) as a guide. Further, the upper edge portion is divided into the upper edge portion and the upper edge side portion which is connected to the upper edge portion as described above, so that the gripping property is significantly improved.

In recent years, in medical handpieces, the sophistication of treatment or the improvement of the performance of the handpiece itself is progressing, and along with it, is there a strong demand for safe and reliable operability of the handpiece? Since the medical handpiece of the present invention has the above-mentioned excellent properties, it can sufficiently meet these requirements.

[Brief description of drawings]

FIG. 1 is a perspective view of a dental handpiece of the present invention.

FIG. 2 is a cross-sectional view taken along the line I-I of FIG. 1, showing a grip portion (G).
It is a figure which shows the cross-sectional shape of 1st embodiment of this.

3 is a cross-sectional view taken along the line I-I of FIG. 1, showing a grip portion (G).
It is a figure which shows the cross-sectional shape of 2nd embodiment of this.

FIG. 4 is a cross-sectional shape view of a grip portion of a conventional dental handpiece, corresponding to FIG. 2. A ………… Dental handpiece H ………… Head T ………… Tooth treatment tool (tool) G ………… Grip 1 ………… Top side 11 ………… Top side top 12, 13 ………… Top side 2 ………… Middle side 3 ………… Bottom part h ………… Height of gripping part W ………… Width of gripping part

Claims (3)

[Claims] 1. A medical handpiece comprising a handpiece head part on which a medical treatment tool is mounted and a gripping part connected to the treatment tool axis of the head part in a direction substantially perpendicular to the axis of the medical treatment tool. Part is the upper side part when viewed in the direction of the treatment tool axis,
It is configured by being divided into a middle side portion and a low side portion, and (ii) the upper side portion has, in a cross-sectional shape, a straight line shape perpendicular to the treatment tool axis or an upward convex curve side top portion, and the upper side top portion. And has a linear upper side portion that is spread and connected to both left and right sides of (iii) the middle side portion is vertically or contracted downward from both end portions of the upper side portion in a sectional shape. It is configured by having a straight or curved middle side portion in the closing direction, and (iv) the bottom portion has a linear or curved shape in cross section from both ends of the middle side portion. A medical handpiece having a flat side portion on the upper side portion, which is configured to have a bottom side portion that contracts and closes. 2. The medical handpiece having a flat side portion on the upper side portion according to claim 1, wherein the upper side portion of the grip portion has a trapezoidal cross section. 3. The upper side portion according to claim 1, wherein the grip portion is made of an injection moldable material and has an upper side portion, a middle side portion, and a bottom side portion. Medical handpiece with flat sides.