Cutting saw with protective cover

Abstract

The utility model provides a cutting saw with a protective cover, which relates to an oral cavity medical instrument and comprises a connecting rod, a protective cover, a connecting rod, a connecting rod and a connecting rod, the connecting rod is provided with a far end and a near end, the near end is used for being detachably connected with a dental handpiece, and the far end is used for fixing a saw blade; the protective cover is in a major arch shape, the protective cover is rotatably arranged at the far end, a balancing weight is arranged on the protective cover, the balancing weight is arranged at the position close to the chord of the protective cover and eccentric to the circle center of the protective cover, and the balancing weight tends to rotate downwards around the far end under the action of self weight. The connecting rod is adopted as a supporting structure of the protective cover, the connecting rod is in clearance fit with the protective cover, the connecting rod is prevented from transmitting rotating power to the protective cover, sight can be prevented from being blocked by the too complex supporting structure, and rotation of the protective cover is not avoided.

Description

Technical Field

[0001] This utility model relates to dental medical devices, and in particular to a cutting saw with a protective cover. Background Technology

[0002] In oral surgery, a cutting saw is often used to cut bone or teeth to correct bone or tooth defects. When the cutting saw comes into contact with bone or teeth, bone fragments can fly out, which can not only obstruct the surgeon's view but also easily get into the throat, causing the patient to gag and potentially posing a danger.

[0003] For the reasons mentioned above, existing technologies typically employ protective shields to protect the dental handpiece from flying bone fragments. Currently, these shields are usually secured by a support extending from the dental handpiece's outer shell, providing both protection and stability. However, given the limited space in the oral cavity, adding a support not only reduces the dentist's operating space but also obstructs their view. Overall, the advantages and disadvantages are roughly equal, indicating that there is still room for improvement in dental handpieces. Utility Model Content

[0004] This utility model provides a cutting saw with a protective cover, the purpose of which is to solve the problem that the installation of the protective cover in the prior art requires a large space, which makes the doctor's field of vision easily obstructed by the installation of the protective cover.

[0005] To achieve the above objectives, embodiments of this utility model provide a cutting saw with a protective cover, comprising:

[0006] A connecting rod having a distal end and a proximal end, the proximal end being for detachable connection to a dental handpiece, and the distal end being for securing a saw blade;

[0007] The protective cover is in the shape of an arc and is rotatably mounted on the far end. A counterweight is provided on the protective cover and is located near the chord of the protective cover and off-center from the center of the protective cover. The counterweight tends to rotate downward around the far end under its own weight.

[0008] Preferably, the distal end is provided with a circumferential mounting groove, the connecting rod passes through the center of the protective cover and the center of the saw blade, the protective cover and the mounting groove are in clearance fit, the saw blade is fixedly connected to the mounting groove, the saw blade and the protective cover are spaced apart, and the saw blade is closer to the proximal end than the protective cover.

[0009] Preferably, a retaining ring is also provided in the mounting ring groove, the retaining ring being used to limit the movement of the protective cover in the radial direction of the connecting rod.

[0010] Preferably, one retaining ring is provided, and the retaining ring is provided at one end of the protective cover near the far end.

[0011] Preferably, the protective cover has a mounting hole near the junction of the chord and the arc, and the counterweight is interference-fitted with the mounting hole.

[0012] Preferably, the protective cover is made of PEI material.

[0013] Preferably, the protective cover also has a folded edge that extends proximally along the edge of the arc of the protective cover.

[0014] Preferably, the saw blade is welded into the mounting ring groove.

[0015] Preferably, the central angle corresponding to the arc in the protective cover is in the range of 150°-170°.

[0016] The above-mentioned solution of this utility model has the following beneficial effects:

[0017] In this application, the dental handpiece drives the connecting rod to rotate, and the saw blade, which is fixedly connected to the connecting rod, rotates synchronously to achieve the cutting purpose. At the same time, the protective cover is rotatably mounted on the connecting rod, and the connecting rod supports the protective cover. By using the connecting rod to support the protective cover, there is no need for the dental handpiece to extend out a support part for support, thus avoiding obstruction of the field of vision due to the support part. In addition, the protective cover is rotatably mounted on the connecting rod and will not rotate due to the driving of the connecting rod, thus avoiding damage to the soft tissues in the oral cavity.

[0018] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] Figure 1 This is the first axonometric drawing of this utility model;

[0020] Figure 2 This is the second axonometric drawing of this utility model;

[0021] Figure 3 This is a top view of this application;

[0022] Figure 4 yes Figure 3 A cross-sectional view along the AA direction.

[0023] [Explanation of Labels in the Attached Image]

[0024] 10-Connecting rod, 20-Saw blade, 30-Protective cover, 31-Counterweight, 32-Arc, 33-String, 34-Folded edge, 40-Stabilizing ring. Detailed Implementation

[0025] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0026] like Figure 1-4 As shown, an embodiment of this utility model provides a cutting saw with a protective cover, including a connecting rod 10 and a protective cover 30. The connecting rod 10 has a distal end and a proximal end in the length direction. The proximal end is detachably connected to a dental handpiece. The dental handpiece drives the connecting rod 10 to rotate around its axis. The connection method between the dental handpiece and the proximal end can refer to existing technology. A saw blade 20 is fixed at the distal end. When the connecting rod 10 rotates, it synchronously drives the saw blade 20 to rotate, thereby cutting bone or teeth. A protective cover 30 is also provided at the distal end. The protective cover 30 is in the shape of a superior arc (also known as a superior arc shape). The protective cover 30 is rotatably mounted on the distal end, allowing it to rotate relative to the connecting rod 10. A counterweight 31 is also provided on the protective cover 30. The counterweight 31 is installed close to the chord 33 of the protective cover 30 and off-center from the center of the protective cover 30. Since the protective cover 30 is equipped with a counterweight 31 and is rotatably mounted on the connecting rod 10, the counterweight 31 tends to rotate downwards around the connecting rod 10 under its own weight, thereby driving the protective cover 30 to rotate.

[0027] Reference Figure 2 As shown, the protective cover 30 is composed of two segments: arc 32 and chord 33. The two ends of chord 33 are connected to the two ends of arc 32 respectively. The central angle of arc 32 is in the range of 150°-170°. Therefore, arc 32 is a superior arc. Thus, the protective cover 30 as a whole presents a superior bow shape, and the closed shape formed by arc 32 and chord 33 has a center.

[0028] A mounting hole is provided near the connection between chord 33 and arc 32. The counterweight 31 is installed in the mounting hole and is interference-fitted with the mounting hole. Preferably, the thickness of the counterweight 31 is the same as that of the protective cover 30 to prevent the counterweight 31 from protruding from the protective cover 30 and interfering with the rotation of the saw blade 20.

[0029] Preferably, the protective cover 30 may also have a folded edge 34, which extends a predetermined length along the edge of the arc 32 of the protective cover 30 towards the proximal end. It is understood that, in order to ensure that the saw blade 20 can operate normally, the folded edge 34 is not provided at the chord 33 of the protective cover 30, but only at the arc 32.

[0030] A circumferential mounting groove is provided at the distal end of the connecting rod 10. The mounting groove is formed by a recess in the surface of the connecting rod 10 towards its axis. The aforementioned saw blade 20 and protective cover 30 are disposed within the mounting groove. In this application, the saw blade 20 is circular with serrated edges. The distal end is sequentially inserted through the saw blade 20 and the protective cover 30, wherein the protective cover 30 is clearance-fitted with the mounting groove, allowing the protective cover 30 to rotate relative to the mounting groove; while the saw blade 20 is fixed within the mounting groove. Preferably, the saw blade 20 is fixed within the mounting groove by laser welding.

[0031] In this application, since the protective cover 30 is arc-shaped and the saw blade 20 is circular, in order to ensure that the protective cover 30 and the saw blade 20 can move in a circular motion, the connecting rod 10 is inserted through the center of the protective cover 30 and the saw blade 20.

[0032] The protective cover 30 is spaced apart from the saw blade 20 to prevent the protective cover 30 from rotating due to interference when the saw blade 20 rotates. The saw blade 20 is closer to the proximal end than the protective cover 30.

[0033] Furthermore, a retaining ring 40 is provided in the mounting ring groove. The retaining ring 40 is used to limit the movement of the protective cover 30 in the radial direction of the connecting rod 10, thereby preventing the protective cover 30 from coming out of the mounting ring groove.

[0034] In this application, a single retaining ring 40 is provided, and the retaining ring 40 is located on the side of the protective cover 30 near the distal end. Since the side of the protective cover 30 near the proximal end has a fixedly installed saw blade 20, which can limit the axial movement of the protective cover 30, only one retaining ring 40 is required in this application.

[0035] Of course, this application can also provide two retaining rings 40, one of which is still located on the side of the protective cover 30 near the far end, and the other retaining ring 40 is located between the saw blade 20 and the protective cover 30. This arrangement can prevent the protective cover 30 from interfering with the normal rotation of the saw blade 20.

[0036] Since the protective cover 30 is only fitted into the mounting ring groove by a clearance fit, slight friction will be generated due to rotation. Therefore, the protective cover 30 in this application is made of PEI material, which has a self-lubricating effect and can reduce frictional resistance.

[0037] When cutting the bone and teeth below, connect the dental handpiece to the proximal end of the connecting rod 10, and insert the distal end of the connecting rod 10 into the oral cavity. At this time, due to the weight of the counterweight 31, the counterweight 31 is located below the connecting rod 10, and the protective cover 30 will prevent the saw blade 20 from contacting the bone. At this time, use tweezers to rotate the protective cover 30 to ensure that the saw blade 20 contacts the bone and teeth. After adjustment, remove the tweezers. Due to the weight of the counterweight 31, the protective cover 30 will rotate, which will play a protective role. At this time, the dental handpiece is turned on for cutting and polishing. Because the protective cover 30 is set and covers the area where the saw blade 20 is not working, it can effectively prevent the saw blade 20 from cutting the soft tissue in the oral cavity if it jumps during cutting.

[0038] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A cutting saw with a guard, characterized in that, include: A connecting rod (10) has a distal end and a proximal end, the proximal end being detachably connected to a dental handpiece, and the distal end being used to secure a saw blade (20); The protective cover (30) is in the shape of an arc. The protective cover (30) is rotatably mounted on the far end. A counterweight (31) is provided on the protective cover (30). The counterweight (31) is located near the chord (33) of the protective cover (30) and off-center from the center of the protective cover (30). The counterweight (31) tends to rotate downward around the far end under its own weight.

2. The guarded cutting saw of claim 1, wherein: The distal end is provided with a circumferential mounting groove. The connecting rod (10) passes through the center of the protective cover (30) and the center of the saw blade (20). The protective cover (30) is clearance-fitted with the mounting groove. The saw blade (20) is fixedly connected to the mounting groove. The saw blade (20) and the protective cover (30) are spaced apart, and the saw blade (20) is closer to the proximal end than the protective cover (30).

3. The guarded cutting saw of claim 2, wherein: A retaining ring (40) is also provided in the mounting ring groove. The retaining ring (40) is used to limit the movement of the protective cover (30) in the radial direction of the connecting rod (10).

4. The guarded cutting saw of claim 3, wherein: One retaining ring (40) is provided, and the retaining ring (40) is located at the end of the protective cover (30) near the far end.

5. The guarded cutting saw of claim 1, wherein: The protective cover (30) has a mounting hole near the connection between the chord (33) and the arc (32), and the counterweight (31) is interference-fitted with the mounting hole.

6. The guarded cutting saw of claim 1, wherein: The protective cover (30) is made of PEI material.

7. The guarded cutting saw of claim 1, wherein: The protective cover (30) also has a folded edge (34) that extends proximally along the edge of the arc (32) of the protective cover (30).

8. The guarded cutting saw of claim 2, wherein: The saw blade (20) is welded into the mounting ring groove.

9. The cutting saw with a protective cover according to claim 1, characterized in that: The central angle range corresponding to the arc (32) in the protective cover (30) is 150°-170°.

Images