Disposable dental handpiece

Abstract

The utility model discloses a disposable dental handpiece, which comprises a handpiece handle and a handpiece head part arranged at the end part of the handpiece handle, and is characterized in that the handpiece head part comprises a shell with an inner cavity, a turbine and a columnar core shaft which is coaxially connected with the turbine are arranged in the shell, the turbine can drive the core shaft to rotate at a high speed, and the core shaft is connected with the inner cavity. A machine needle which is coaxial with the mandrel and extends to the outside of the shell is arranged at the end part of the mandrel, and the mandrel and the machine needle are of an integrated structure. The utility model has the characteristics that the safety is improved, the structure is more stable, the operation is more convenient, and the rotating precision of the machine needle is improved.

Description

Technical Field

[0001] This utility model relates to a disposable dental handpiece, belonging to the field of medical device technology. Background Technology

[0002] In daily life, when dental problems arise, such as broken teeth, cavities, or wisdom teeth, dentists often need to treat the affected teeth. In such cases, dental handpieces are commonly used. A dental handpiece is a common oral instrument that uses high-speed rotation in conjunction with a bur to perform tasks such as turning and drilling on teeth. A typical dental handpiece consists of a handle, a handpiece head connected to one end of the handle, and a bur located outside the handpiece head and connected to the main shaft of the handpiece head via a locking mechanism. When in use, the bur is connected to the main shaft inside the handpiece head via the locking mechanism. The main shaft rotates at high speed driven by a rotating device, thus achieving high-speed rotation of the bur. The locking mechanism typically uses a three-leaf spring or other spring-like structure for clamping. However, such structures have drawbacks such as poor safety, inconvenient operation, insufficient precision, and low efficiency. Utility Model Content

[0003] The purpose of this utility model is to provide a disposable dental handpiece that solves the problems of poor safety performance, inconvenient operation, insufficient precision, and low efficiency in the existing technology.

[0004] The above-mentioned technical objective of this utility model is mainly achieved through the following technical solution: a disposable dental handpiece, including a handpiece handle and a handpiece head disposed at the end of the handpiece handle. The handpiece head includes a housing with an inner cavity. Inside the housing, there is a turbine and a mandrel coaxially connected to the turbine and in a columnar shape. The turbine can drive the mandrel to rotate at high speed. At the end of the mandrel, there is a bur coaxially arranged with the mandrel and extending to the outside of the housing.

[0005] As a further preferred technical solution of this utility model, the mandrel and the needle are integrally formed.

[0006] As a further preferred technical solution of this utility model, a first positioning groove is provided at the connection between the end of the mandrel and the needle, the fixed section of the needle is located in the first positioning groove, and the tip of the needle is set outward.

[0007] As a further preferred technical solution of this utility model; the mandrel includes a connecting section and a bearing mounting section, the bearing mounting section is connected to the needle through the connecting section, and the middle part of the bearing mounting section is connected to the turbine.

[0008] As a further preferred technical solution of this utility model, the bottom of the housing is provided with a through hole for the connecting section to pass through, and the through hole is spaced apart from the side wall of the connecting section.

[0009] As a further preferred technical solution of this utility model, the upper and lower sidewalls of the connecting section are respectively provided with a first bearing and a second bearing that abut against the housing at the two end faces of the turbine.

[0010] As a further preferred technical solution of this utility model, the first bearing and the second bearing are both fitted with bearing seats that abut against the inner wall of the housing.

[0011] As a further preferred technical solution of this utility model, the housing includes a fixing part connected to the mobile phone handle and an upper cover threadedly engaged with the fixing part, and the inner side of the upper cover is provided with a second positioning groove that engages with the bearing seat on the first bearing.

[0012] Therefore, this utility model has the advantages of improved safety, more stable structure, more convenient operation, and improved accuracy when the needle rotates. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present utility model;

[0014] Figure 2 yes Figure 1 A sectional view of the structure of the head of a mobile phone;

[0015] Figure 3 This is a structural schematic diagram of Embodiment 2 of this utility model. Detailed Implementation

[0016] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings. Example 1:

[0017] like Figure 1-2As shown, a disposable dental handpiece includes a handpiece handle 1 and a handpiece head 2 located at the end of the handpiece handle 1. The handpiece head 2 includes a housing 3 with an inner cavity. Inside the housing 3, there is a turbine 31 and a cylindrical mandrel 32 coaxially connected to the turbine 31. The turbine 31 can drive the mandrel 32 to rotate at high speed. At the end of the mandrel 32, there is a bur 33 coaxially arranged with the mandrel 32 and extending to the outside of the housing 3. The handpiece handle is connected to the handpiece head. The inner cavity of the housing of the handpiece head is provided with the turbine and the mandrel that drive the mandrel to rotate. The mandrel and the bur are integrally formed, avoiding gaps and unstable clamping that may occur during the assembly of the mandrel and the bur. To prevent issues such as needle slippage, the mandrel, bur, and turbine are all coaxially designed to ensure stability during bur rotation. This prevents the bur from detaching at high speeds, improving safety and making the structure more stable and easier to operate. It also improves the accuracy of bur rotation, making the bur work more stably. The one-piece molded bur in this embodiment can be customized according to needs and is used for the most common diagnostic and treatment procedures such as pulpotomy and pulp cap exposure. It is mainly used for treatments and tooth extractions that do not require bur replacement, making it convenient, safe, reducing the workload of doctors, saving patients' treatment time, and eliminating iatrogenic cross-infection, as routine diagnostic and treatment activities such as treatments and tooth extractions account for 80% of the total number of treatments.

[0018] The integrated bur in this embodiment is convenient to use in dental handpieces. There is no need to install or remove the bur during clinical use. It is disposable. The disposable dental handpiece with bur is sterilized before leaving the factory. One person, one machine, which can prevent cross-infection caused by the instantaneous negative pressure when the dental handpiece is stopped. At the same time, the bearings and burs in the disposable dental handpiece with bur are all newly manufactured, with high sharpness and large cutting force, saving patients' treatment time and reducing the labor intensity of doctors. Moreover, the disposable nature can avoid the inefficiency caused by the wear and tear of traditional metal handpieces due to bearings and burs.

[0019] like Figure 2As shown, the mandrel 32 includes a connecting section 321 and a bearing mounting section 322. The bearing mounting section 322 is connected to the needle 33 via the connecting section 321. The middle part of the bearing mounting section 322 is connected to the turbine 31. The upper and lower sidewalls of the connecting section 321, corresponding to the two end faces of the turbine 31, are respectively provided with a first bearing 35 and a second bearing 36 that abut against the housing 3. The outer sides of the first bearing 35 and the second bearing 36 are each fitted with a bearing seat 37 that abuts against the inner wall of the housing 3. The mandrel is cylindrical and consists of the connecting section and the bearing mounting section. The bearing mounting section, the connecting section, and the needle are coaxially and integrally formed. The middle part of the bearing mounting section is coaxially connected to the turbine. Both ends are connected to the first and second bearings respectively, allowing the mandrel to rotate within the housing supported by the first and second bearings. Both the first and second bearings are fixed within the housing via bearing seats. The aforementioned connecting section connects the bearing mounting section and the needle to form an integrated structure. The bearing mounting section facilitates the connection of the bearings, ensuring stable and smooth rotation of the mandrel and the needle. The first and second bearings provide a fixed connection to both ends of the mandrel, enabling reliable fixation and rotation of the mandrel at the head of the machine, ensuring stability and reliability during rotation of the mandrel and the needle. The bearing seats provide protective support for the bearings, maintaining their stability and making assembly more convenient.

[0020] like Figure 2 As shown, the bottom of the housing 3 is provided with a through hole 34 for the connecting section 321 to pass through and with a gap between the connecting section 321 and the side wall of the connecting section 321. The housing 3 includes a fixing part 38 connected to the mobile phone handle 1 and an upper cover 39 threadedly engaged with the fixing part 38. The inner side of the upper cover 39 is provided with a second positioning groove 391 that engages with the bearing seat 37 on the first bearing 35. The housing is composed of an upper cover and a fixing part. The upper cover is screwed and fixed to the fixing part by threads. The second positioning groove on the inner side of the upper cover engages with the bearing seat to position the bearing seat. The inner cavity on the inner side of the fixing part engages with another bearing seat to position the bearing seat. The first bearing and the second bearing both engage with the recess on the inner side of the bearing seat. The shaft is located inside the housing, while the needle extends through the through hole to the outside of the housing. The connecting section is located inside the through hole, and a gap is formed between the outer wall of the connecting section and the inner wall of the through hole. The aforementioned fixing part and the top cover are threaded together to form a detachable structure, which facilitates the replacement and maintenance of components and makes assembly more convenient. The second positioning groove is set to facilitate the positioning of the bearing seat and maintain the stability of the bearing seat and the first bearing. The through hole is used for the connecting section to pass through so that the needle protrudes from the head of the handpiece and maintains the smooth rotation of the needle. At the same time, the gap between the connecting section and the through hole is set to avoid rotational friction between the spindle and the housing, which would cause excessive wear of the spindle and extend the service life of the spindle and the needle. Example 2:

[0021] like Figure 3As shown, a first positioning groove 320 is provided at the connection between the end of the mandrel 32 and the needle 33. The fixed section of the needle 33 is located in the first positioning groove 320 and is bonded with adhesive. The tip of the needle 33 is set outward. The mandrel is connected to the turbine, and the fixed section of the needle is inserted into the first positioning groove. The side wall of the needle fits with the inner wall of the first positioning groove and is bonded with adhesive. The adhesive is a medical-grade fixing adhesive that is currently available on the market. It provides reliable and durable fixation for the needle and the mandrel, making the needle and the mandrel form an integral structure, ensuring the stability of the needle during rotation, preventing the needle from dislodging during high-speed rotation, improving safety, and improving the accuracy of the needle during rotation, making the needle work more stably. In this embodiment, the length of the mandrel is 12.5mm, and the length of the first positioning groove of the mandrel is 11mm. The needle in this embodiment is a standard needle and does not need to be customized. However, there are many types of needles, and doctors have their own usage habits. According to the type required by the doctor, a standard needle can be bonded to the mandrel with adhesive.

[0022] The other structures in this embodiment are the same as in Embodiment 1, and will not be described again here.

[0023] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present technical solution are within the protection scope of the present invention.

Claims

1. A disposable dental handpiece, comprising a handpiece handle (1) and a handpiece head (2) disposed at the end of the handpiece handle (1), characterized in that: The mobile phone head (2) includes a housing (3) with an inner cavity. Inside the housing (3) is a turbine (31) and a mandrel (32) that is coaxially connected to the turbine (31) and is columnar. The turbine (31) can drive the mandrel (32) to rotate at high speed. The end of the mandrel (32) is provided with a needle (33) that is coaxially arranged with the mandrel (32) and extends to the outside of the housing (3).

2. The disposable dental handpiece according to claim 1, characterized in that: The mandrel (32) and the needle (33) are integrally formed.

3. The disposable dental handpiece according to claim 1, characterized in that: The mandrel (32) is provided with a first positioning groove (320) at the connection between the end of the mandrel (32) and the needle (33). The fixed section of the needle (33) is located in the first positioning groove (320), and the tip of the needle (33) is set outward.

4. The disposable dental handpiece according to claim 2 or 3, characterized in that: The mandrel (32) includes a connecting section (321) and a bearing mounting section (322). The bearing mounting section (322) is connected to the needle (33) through the connecting section (321), and the middle part of the bearing mounting section (322) is connected to the turbine (31).

5. The disposable dental handpiece according to claim 4, characterized in that: The bottom of the housing (3) is provided with a through hole (34) for the connecting section (321) to pass through and with a gap between the connecting section (321) and the side wall of the connecting section (321).

6. The disposable dental handpiece according to claim 4, characterized in that: The upper and lower sidewalls of the connecting section (321) are respectively provided with a first bearing (35) and a second bearing (36) that abut against the housing (3) at the two end faces of the turbine (31).

7. The disposable dental handpiece according to claim 6, characterized in that: The first bearing (35) and the second bearing (36) are both fitted with bearing seats (37) that abut against the inner wall of the housing (3).

8. The disposable dental handpiece according to claim 7, characterized in that: The housing (3) includes a fixing part (38) connected to the mobile phone handle (1) and an upper cover (39) threadedly engaged with the fixing part (38). The inner side of the upper cover (39) is provided with a second positioning groove (391) that engages with the bearing seat (37) on the first bearing (35).

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