阅读说明：本技术 一种分层可抛弃式口腔数字印模仪扫描头 (Layered disposable oral digital impression instrument scanning head ) 是由 千行军 陈瀚铮 汪伟 朱亮亮 于 2021-09-07 设计创作，主要内容包括：本申请公开了一种分层可抛弃式口腔数字印模仪扫描头,其特征在于：包括固定壳体以及套设于壳体上的可抛弃外层壳体,所述固定壳体与手持件固定连接。本申请的一种分层可抛弃式口腔数字印模仪扫描头通过分层可抛弃式的设计,在患者进行数字化扫描之前,无需对设备进行消毒,只要将扫描头外层的可抛弃部分更换即可,从而方便口腔数字印模仪在下沉市场的使用；在扫描头中设置新型防起雾模块,防雾的效果较好,降低了因镜片起雾原因影响最终的扫描精度的风险；优化了固定壳体与手持件的固定连接设计,引入了强磁组件或插销式等设计,方便了用户使用；在扫描头设置扫描头类型检测模块,通过检测不同型号的扫描头所带来的阻值变化进行判断当前安装的扫描头型号。(The application discloses but layering formula oral cavity digital impression appearance scanning head of abandoning, its characterized in that: comprises a fixed shell and a disposable outer shell sleeved on the shell, wherein the fixed shell is fixedly connected with a hand-held piece. According to the layered disposable oral digital impression instrument scanning head, through the layered disposable design, before a patient carries out digital scanning, equipment does not need to be disinfected, and only the disposable part of the outer layer of the scanning head needs to be replaced, so that the oral digital impression instrument can be conveniently used in the sinking market; the novel anti-fogging module is arranged in the scanning head, so that the anti-fogging effect is good, and the risk that the final scanning precision is influenced due to the fogging reason of the lens is reduced; the fixed connection design of the fixed shell and the hand piece is optimized, and the strong magnetic component or the bolt type design and the like are introduced, so that the use by a user is facilitated; a scanning head type detection module is arranged on the scanning head, and the type of the currently installed scanning head is judged by detecting resistance value changes caused by different types of scanning heads.)

1. The utility model provides a but layering formula oral cavity digital impression appearance scanning head which characterized in that: comprises a fixed shell and a disposable outer shell sleeved on the fixed shell, wherein the fixed shell is fixedly connected with a hand-held piece.

2. The layered disposable oral digital impression scanner head of claim 1, wherein: the front end of the fixed shell of the scanning module comprises an optical module and a transparent window arranged on the shell of the disposable outer layer, and the light path enters the optical module through the transparent window to perform optical imaging.

3. The layered disposable oral digital impression scanner head of claim 2, wherein: optical module is 45 right-angle triple prism, 45 right-angle triple prism is installed in fixed casing front end, 45 right-angle triple prism right-angle face with transparent window laminates mutually, thereby 45 right-angle triple prism and transparent window are corresponding makes the light path pass through to the visual direction angle that makes the scanning head is 90.

4. The layered disposable oral digital impression scanner head of claim 2, wherein: optical module is the speculum, transparent window is for following the 45 prism shape transparent window that can abandon outer casing and extend formation to fixed casing, the 45 face laminating of speculum and 45 prism shape transparent window to make the light path see through carry out optical imaging by the speculum reflection behind the 45 prism shape transparent window, and make the look of scanning head to the angle be 90.

5. The layered disposable oral digital impression scanner head of claim 2, wherein: the scanning head further comprises an anti-fog module, and the anti-fog module is arranged in the fixed shell and used for preventing the scanning module from fogging.

6. The layered disposable oral digital impression scanner head of claim 5, wherein: the antifogging module comprises an electric heating module and an electric heating driving circuit, the electric heating driving circuit is connected with the electric heating module through a connecting cable, and the electric heating module is arranged on the rear side of the optical module.

7. The layered disposable oral digital impression scanner head of claim 5, wherein: the antifogging module comprises an electric heating module, an electric heating driving circuit, a metal sheet and a heat conducting component, wherein the metal sheet is connected with the electric heating module through the heat conducting component, the electric heating driving circuit is connected with the electric heating module through a connecting cable, and the electric heating module is arranged on the rear side of the optical module.

8. The layered disposable oral digital impression scanner of any of claims 6 or 7, wherein: the electric heating module is a PCT electric heating sheet.

9. The layered disposable oral digital impression scanner head of claim 1, wherein: the fixed shell is fixedly connected with the hand piece through any one of a strong magnetic assembly, a bolt type, a clamp spring type and a screw fixing type.

10. The layered disposable oral digital impression scanner head of claim 1, wherein: the scanning head detection module is used for detecting the scanning heads with different sizes and models.

11. The layered disposable oral digital impression scanner head of claim 10, wherein: the scanning head detection module is arranged in the handheld piece, and the type of the scanning head which is installed at present is judged through resistance value change.

12. The layered disposable oral digital impression scanner head of claim 10, wherein: the scanning head detection module is arranged in the handheld piece, and the type of the currently installed scanning head is judged through the change of the imaging result.

Technical Field

The application relates to the field of oral scanners, in particular to a layered disposable oral digital impression scanner scanning head.

Background

In recent years, people have paid more and more attention to oral health and tooth beauty. In the field of orthodontics, implantation and restoration, the dental digital impression apparatus is convenient and fast compared with the traditional impression in the using process, and the acceptance degree of a patient is high. In the traditional oral clinical process, a dentist is required to take a die of a patient's tooth, the die is sent to a machining center, the machining center copies the die into a plaster model, the plaster model is converted into a three-dimensional model by a desktop scanner, then the machining center designs an orthodontic tooth socket, an implant or a false tooth and the like for the patient on the basis of the three-dimensional model, and the finished product is sent to the dentist in clinic after being made. The traditional method for taking the model of the patient's teeth in clinic is long in time consumption, low in efficiency and poor in patient experience, and the digital scanning of the oral cavity can improve the condition, reduce the workload of doctors, reduce the discomfort of the patient and improve the patient experience.

At present, easy operation, high accuracy, the convenient digital impression technique of storage more and more receive the attention of oral cavity medical field, and the digital scanning of oral cavity falls into two main categories according to the position of scanning, includes: extraoral scanning and intraoral scanning. In which, the intraoral scanning is a new scanning mode appearing at home and abroad in recent years. The intraoral scanning specifically refers to that equipment is inserted into the oral cavity of a patient to directly measure a tooth body, and a three-dimensional digital model of the tooth body is obtained in real time. The digital intraoral scanner has the following characteristics:

(1) the equipment has high requirement on size, the oral cavity is narrow, and a small oral digital impression instrument is needed, so that information collection is conveniently carried out in the deep oral cavity, and the user experience is improved by the small equipment;

(2) the requirement on scanning efficiency is high, and the comfort of a patient is influenced by opening and closing the oral cavity for a long time, so that an oral three-dimensional digital model needs to be rapidly obtained;

(3) the requirement on scanning precision is high, and the acquired digital model can be directly applied to the fields of orthodontics, implantation and repair;

(4) the use environment requirement is high, the use of the existing oral digital impression apparatus needs to extend the scanning head into the oral cavity of a patient to scan teeth, and each patient needs to be cleaned, disinfected and sterilized before digital scanning, so that cross infection is avoided. In the process of using the oral digital impression apparatus, a dental hospital or clinic needs to have corresponding disinfection and sterilization conditions, a special device needs to be used for disinfecting the scanning head, and otherwise, the risk of cross infection is caused.

In the prior art, the scanning head of the existing oral digital impression instrument at least has the following defects:

1) existing scan heads require cleaning, sterilization, and disinfection prior to each patient being digitally scanned. The scanning head requires special sterilization tools, increasing the cost of use while some smaller clinics are unable to meet the corresponding sterilization requirements. If the disinfection and sterilization are not thorough, the risk of cross infection is brought to patients.

2) The existing fixed mounting mode of the integral scanning head and the hand piece may affect the precision of a finally scanned three-dimensional model, and the stability of the integral scanning head and the hand piece after multiple mounting also has a certain problem; the fixed mounting mode of the scanning head and the hand-held piece is realized by bouncing the elastic sheet to fix the scanning head, after cleaning, disinfection and sterilization are finished, when the scanning head is mounted for many times, the scanning head is possibly inclined to a certain extent when the scanning head is mounted on the handle due to the incomplete consistency of the elastic forces of the elastic sheets for fixing the scanning head, so that the accuracy of a three-dimensional model of teeth of a patient scanned by the scanning head of the oral digital impression instrument is insufficient, and the reworking caused by the fact that false teeth, prosthesis or orthodontic braces and the like manufactured according to the three-dimensional model are not matched with the patient enough is influenced;

in addition, because the scanning head is cleaned, disinfected and sterilized before each patient is digitally scanned, the scanning head inevitably needs to be plugged and pulled for many times, the elastic sheet can cause the elastic force to fall after being used for many times, and the scanning head has the risk of falling off in the using process.

3) In the existing scanning head design, part of the scanning head is added with an anti-fogging module, and the design of the heat dissipation module brings higher replacement cost of the scanning head. In order to prevent the oral cavity digital impression apparatus from fogging during the use process, an anti-fogging module is generally added in the scanning head, and anti-fogging treatment is performed on an optical lens in the scanning head and extending into the oral cavity of a patient, such as heating the lens. Generally, after the scanning head is sterilized by a special device and exceeds a certain number of times, the scanning head needs to be replaced by a new scanning head, and an anti-fogging device module is generally arranged in the scanning head, so that the use cost is increased invisibly.

4) In the existing scanning head design, the design effect of the anti-fogging module contained in part of the scanning head is poor, and if the heating temperature of the lens is too high, the surface temperature of the oral digital impression apparatus is too high, and on one hand, the requirements of relevant electrical safety standards (the surface of the equipment has temperature range limitation) are not met. On the other hand, the use feeling of the patient is also reduced; if the heating temperature of the lens is insufficient, the anti-fogging effect is poor, and the imaging effect is influenced.

Disclosure of Invention

The invention aims to provide a layered disposable scanning head of an oral digital impression instrument, which greatly reduces the use cost and necessary conditions of the oral digital impression instrument in the use process by innovating in the aspects of electronics and structural design; cross infection caused by improper disinfection in the using process is also avoided; the influence on the scanning precision caused by the installation error of the scanning head when the scanning head is replaced is also avoided; the fixed connection design of the fixed shell and the hand-held piece is optimized, and the use by a user is facilitated; and arranging a scanning head type detection module on the scanning head to judge the type of the currently installed scanning head. The present invention overcomes the deficiencies in the prior art by optimizing and improving upon the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a layering can abandon formula oral cavity digital impression appearance scanning head, includes fixed casing and the outer casing of abandoning of cover on fixing the casing, fixed casing and handheld piece fixed connection.

Preferably, the front end of the fixed shell of the scanning module comprises an optical module and a transparent window arranged on the disposable outer shell, and the light path enters the optical module through the transparent window to perform optical imaging.

Further, optical module is 45 right-angle triple prism, 45 right-angle triple prism installs in fixed casing front end, 45 right-angle triple prism right-angle face with transparent window laminates mutually, thereby 45 right-angle triple prism and transparent window are corresponding makes the light path pass through to the sight angle that makes the scanning head is 90.

Further, optical module is the speculum, transparent window is for following the 45 prism shape transparent window that can abandon outer shell and extend formation to fixed casing, the 45 face laminating of speculum and 45 prism shape transparent window to make the light path see through carry out optical imaging by the speculum reflection behind the 45 prism shape transparent window, and make the viewing direction angle of scanning head be 90.

Preferably, the scanning head further comprises an anti-fog module, and the anti-fog module is arranged in the fixed shell and used for preventing the scanning module from fogging.

Further, the antifogging module comprises an electric heating module and an electric heating driving circuit, the electric heating driving circuit is connected with the electric heating module through a connecting cable, and the electric heating module is arranged on the rear side of the optical module.

Further, antifog module is including electrical heating module, electrical heating drive circuit, sheetmetal and heat-conducting part, the sheetmetal pass through heat-conducting part with electrical heating module links to each other, electrical heating drive circuit through the connecting cable with electrical heating module links to each other, electrical heating module sets up in optical module's rear side.

Preferably, the electric heating module is a PCT electric heating sheet.

Preferably, the fixed shell and the hand piece are fixedly connected through any one of a strong magnetic assembly, a latch type, a clamp spring type and a screw fixing type.

Preferably, the scanning head detection module is further included, and the scanning head detection module is used for detecting scanning heads with different sizes and models.

Furthermore, the scanning head detection module is arranged in the handheld piece, and the type of the currently installed scanning head is judged through resistance value change.

Furthermore, the scanning head detection module is arranged in the handheld piece, and the type of the currently installed scanning head is judged according to the change of the imaging result.

Compared with the prior art, the layered disposable oral digital impression apparatus scanning head has the following beneficial effects:

1) through the layered disposable design, before the digital scanning of the patient, the equipment does not need to be disinfected, and only the disposable part of the outer layer of the scanning head needs to be replaced, so that the use of the oral digital impression instrument in the sinking market is facilitated;

2.) the inner layer of the scanner is fixed with the hand piece, when a patient carries out digital scanning, only the disposable outer layer part needs to be replaced without replacing the inner shell, so that the repeated plugging and unplugging of the scanning head in the using process is reduced, and the risk that the joint of the scanning head and the handle is seriously loosened and even falls off after the scanning head is plugged and unplugged for multiple times is avoided;

3.) the scanning precision of the scanning head is improved through the internal structure of the scanning head and the design of electronic components; on one hand, the scanning head is fixedly connected with the handheld instrument through the inner layer, so that the deviation of the mounting position of the scanning head caused by repeated disassembly and replacement is avoided, and the accuracy of a scanned three-dimensional model of the teeth of a patient is ensured; on the other hand, the novel anti-fogging module is arranged in the scanning head, so that the anti-fogging effect is better, and the risk of influencing the final scanning precision due to lens fogging is reduced;

4.) the scanning head of the invention can be disposed of through the layering, the design is novel, simple in construction, have greatly reduced the use cost while each patient carries on the digitized scanning;

5.) the anti-fogging device of the invention has the advantages of small thermal resistance and high heat exchange efficiency, can prevent overhigh heating temperature, prevent the surface of equipment from being over-heated, and reduce the risk in the aspect of electrical safety over-temperature.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic diagram of a scanner head of a layered disposable oral digital printer according to embodiment 1 of the present invention;

FIG. 2 is a schematic structural diagram of a scanner head of a layered disposable oral digital printer according to embodiment 2 of the present invention;

FIG. 3 is a schematic structural diagram of a layered disposable oral digital printer scanner head according to embodiment 3 of the present invention;

FIG. 4 is a first schematic view of the inner housing of the scanner head of the layered disposable oral digital printer and the hand piece according to the embodiment of the present invention;

FIG. 5 is a second schematic structural view of the inner housing of the scanner head of the layered disposable oral digital impression apparatus connected to the hand piece according to the embodiment of the present invention;

FIG. 6 is a schematic diagram of a scanning module of a scanner head of a layered disposable oral digital printer according to an embodiment of the present invention;

wherein: 1. a disposable outer shell; 2. the scanning head fixes the inner shell; 3. a first type transparent window; 4. a 45-degree prism; 5. a second type of transparent window; 6. a mirror; 7. an electric heating module; 8. a metal sheet; 9. an electric heating drive circuit; 10. connecting a cable; 11. a heat conductive member; 12. a scanning head type detection module; 13. a handpiece; 14. a hook; 15. a ferromagnetic component; 16. a reed; 17 reed base.

Detailed Description

The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Example 1

Referring to fig. 1, a scanner head of a disposable oral digital stamp device is fixed to a hand piece 13 through a fixed inner housing 2, and a disposable outer housing 1 is sleeved on the fixed inner housing 2.

In the technical scheme, the disposable outer shell 1 is sterilized and aseptically packaged when leaving a factory, and when in use, the disposable outer shell 1 is taken out from a medical sterilization packaging bag in a sealing way and is arranged on the fixed inner shell 2; the disposable outer shell 1 is used for isolating the contact between the outer surface of the oral digital impression apparatus and the inner wall of the oral cavity of the patient; after use, the disposable outer shell 1 is simply peeled off from the fixed inner shell 2.

Specifically, the disposable outer shell 1 can be made of plastic or plastic film; the disposable outer shell 1 made of plastic film has good elasticity, can be directly sleeved and fixed on the inner shell 2, is convenient to use and is not easy to fall off. Similarly, the disposable outer shell 1 of the present application is not limited to the above-mentioned plastic or plastic film material, but may be any one of PET, HDPE, PVC, PP and PS, and any one of those materials can be used as the disposable outer shell 1 as long as it meets the requirements of the present application. Simultaneously this application can abandon outer casing 1 cover establish can also fix with fixed inlayer casing 2 through connection methods such as buckle, external clamp, prevent that can abandon outer casing 1 from droing from fixed inlayer casing 2 surface, can abandon outer casing 1 cover establish with fixed inlayer casing 2 do not confine foretell fixed mode yet, as long as accord with this application technical scheme requirement all can.

Fixed 2 front ends of inlayer casing become 45 degrees angularity, are provided with 45 degrees prisms 4 in the fixed 2 front ends of inlayer casing, can abandon outer 1 surface of casing and seted up first type transparent window 3, and first type transparent window 3 is corresponding with the trompil department of fixed inlayer casing 2, hugs closely with 45 degrees prisms 4 simultaneously, makes things convenient for the business turn over of light path, has also guaranteed simultaneously that the visual direction angle of oral cavity digital impression appearance is 90 degrees.

The layered disposable oral digital impression apparatus scanning head also comprises an electric heating module 7 and an electric heating driving circuit 9; the electric heating module 7 and the electric heating driving circuit 9 are disposed in the fixed inner shell 2. The electric heating module 7 is installed on the rear side of the 45-degree prism 4 and heats the 45-degree prism 4 when the device is used, so that the fogging of the mirror surface is avoided. The electric heating module 7 is connected with an electric heating driving circuit 9 through a connecting cable 10, so that the temperature of the electric heating module 7 is controlled and is ensured to be in a constant temperature range.

In the technical scheme, the electric heating module 7 is preferably a PTC heating sheet, and the PTC heating body has the advantages of small thermal resistance and high heat exchange efficiency, and is an automatic constant-temperature and electricity-saving electric heater; can prevent that heating temperature is too high, prevent that equipment surface from overtemperature, reduce the risk in the aspect of the electrical safety overtemperature.

As shown in fig. 4, in an embodiment of the present application, the hand piece 13 is connected to the fixed inner casing 2 through the hook 14 and the slot, the hand piece 13 extends outward to form the slot, the fixed inner casing 2 extends outward to form the hook 14, and the hook 14 is matched with the slot, so that the hand piece 13 is fastened to the fixed inner casing 2.

Referring to fig. 5, in an embodiment of the present application, the hand piece 13 is connected to the fixed inner casing 2 through the ferromagnetic component 15, the ferromagnetic component 15 is disposed on one side of the end of the hand piece 13, the ferromagnetic component 15 is disposed on one side of the fixed inner casing 2 and extends outwards, the hand piece 13 is fixedly connected to the fixed inner casing 2 through the ferromagnetic component, and when the hand piece 13 is close to the fixed inner casing 2, the hand piece 13 and the fixed inner casing 2 are attracted automatically due to the magnetic force.

In practical application, a suitable strong magnet can be selected: on one hand, the strong magnetic attraction is ensured not to be too large, and the fixed inner shell 2 is convenient to take down from the hand-held piece 13 after attraction; on the other hand, the strong magnetic attraction force is not too small, and the fixed inner shell 2 cannot fall off from the hand piece 13 in the using process. Specifically, the connection method of the hand piece 13 and the fixed inner housing 2 is not limited to the above connection method, and may be a connection method such as a bayonet connection or a screw connection as long as the effect of the present application can be achieved.

Referring to fig. 6, the scanner head of the disposable oral digital printer further comprises a scanner head type detection module 12. The scanning head type detection module 12 is disposed inside the hand piece 13, and has a signal line and a power line inside, and different voltage dividing resistors inside different fixed inner shells 2. The handheld piece 13 is connected with the fixed inner shell 2 through the reed seat 17 and the reed 16, the end of the handheld piece 13 is provided with the reed seat 17, one side of the fixed inner shell 2 extends outwards to be provided with the reed 16, and the handheld piece 13 and the fixed inner shell 2 are electrically connected through the reed seat 17 and the reed 16. When fixed inlayer casing 2 is connected with handheld piece 13, the divider resistance of fixed inlayer casing 2 inside links to each other with scanning head type detection module 12 through reed seat 17 and reed 16 to produce different voltages, scanning head type detection module 12 obtains different sampling voltage values through the ADC sampling, and then discerns different fixed inlayer casings 2 and the concrete model that can abandon outer casing 1 that corresponds.

In this technical scheme, to the oral cavity size with different patients, the user can select the scanning head of different model specifications to scan, also need adjust corresponding parameter to the scanning module that the scanning head of different models corresponds and adjust. The scanning head detection module 12 of the embodiment of the application effectively solves the problem that parameters of scanning modules need to be manually adjusted for different types of scanning heads. When a user only needs to connect the handle 13 with the fixed inner shell 2 of the scanning head, the model of the scanning head can be automatically detected, and meanwhile, the scanning module can also adjust corresponding parameters according to the model of the scanning head.

In another embodiment of the present application, the scanning head type detecting module 12 may also scan the teeth inside the oral cavity of the patient through the 45-degree prism 4 and the first type transparent window 3, and determine the type and specification of the currently installed scanning head by detecting the change of the imaging result brought by different types of scanning heads, such as the change of the size of the imaging field of view.

Example 2

Referring to fig. 2, a scanner head of a disposable oral digital printer is fixed to a hand piece 13 by a fixed inner housing 2, and a disposable outer housing 1 is sleeved on the fixed inner housing 2.

In the technical scheme, the disposable outer shell 1 is sterilized and aseptically packaged when leaving a factory, and when in use, the disposable outer shell 1 is taken out from a medical sterilization packaging bag in a sealing way and is arranged on the fixed inner shell 2; the disposable outer shell 1 is used for isolating the contact between the outer surface of the oral digital impression apparatus and the inner wall of the oral cavity of the patient; after use, the disposable outer shell 1 is simply peeled off from the fixed inner shell 2.

Fixed 2 front ends of inlayer casing become 45 degrees angularity, are provided with 45 degrees prisms 4 in the fixed 2 front ends of inlayer casing, can abandon outer 1 surface of casing and seted up first type transparent window 3, and first type transparent window 3 is corresponding with the trompil department of fixed inlayer casing 2, hugs closely with 45 degrees prisms 4 simultaneously, makes things convenient for the business turn over of light path, has also guaranteed simultaneously that the visual direction angle of oral cavity digital impression appearance is 90 degrees. The scan head type detection module 12 is disposed inside the handpiece 13.

The layered disposable oral digital impression apparatus scanner head also comprises an electric heating module 7, an electric heating driving circuit 9, a connecting cable 10, a heat conducting part 11 and a metal sheet 8, wherein the electric heating module 7, the electric heating driving circuit 9 and the connecting cable 10 are arranged in a hand piece 13, and the heat conducting part 11 and the metal sheet 8 are arranged in a fixed inner shell 2; the metal piece 8 is arranged on the rear side of the 45-degree prism 4, the metal piece 8 is connected with the electric heating module 7 through the heat conducting part 11, and the electric heating module 7 is connected with the electric heating driving circuit 9 through the connecting cable 10; the electric heating driving circuit 9 controls the temperature of the electric heating module 7 to ensure that the electric heating module is in a constant temperature range; the electric heating module 7 transmits the temperature to the metal sheet 8 through the heat conductive member 11, thereby preventing fogging of the 45-degree prism 4. The electric heating module 7 is preferably a PTC heating sheet, the PTC heating body has the advantages of small thermal resistance and high heat exchange efficiency, and is an automatic constant-temperature and electricity-saving electric heater; can prevent that heating temperature is too high, prevent that equipment surface from overtemperature, reduce the risk in the aspect of the electrical safety overtemperature.

In the technical scheme, the temperature of the scanning head is reduced in a heat transfer mode, and the influence of high temperature on the user experience of a patient is avoided; meanwhile, the electric heating module 7 is arranged in the handheld piece 13, and a user can adjust the electric heating temperature according to the temperature of the handheld piece 13.

Example 3

Referring to fig. 3, a scanner head of a disposable oral digital printer is fixed to a hand piece 13 by a fixed inner housing 2, and a disposable outer housing 1 is sleeved on the fixed inner housing 2.

In the technical scheme, the disposable outer shell 1 is sterilized and aseptically packaged when leaving a factory, and when in use, the disposable outer shell 1 is taken out from a medical sterilization packaging bag in a sealing way and is arranged on the fixed inner shell 2; the disposable outer shell 1 is used for isolating the contact between the outer surface of the oral digital impression apparatus and the inner wall of the oral cavity of the patient; after use, the disposable outer shell 1 is simply peeled off from the fixed inner shell 2.

The front end of the fixed inner shell 2 inclines at an angle of 45 degrees, and the shell at the front end of the fixed inner shell 2 is provided with a groove. Abandon outer shell 1 surface and be provided with second type transparent window 5, second type transparent window 5 is 45 degrees transparent prism forms, and second transparent window 5 makes the 45 degrees faces of second transparent window 5 and speculum 6 hug closely along the recess entering fixed inlayer casing 2 in. The light rays are refracted through the second transparent window 5 and then change directions, so that the viewing angle of 90 degrees is ensured; and then reflected by the mirror to the scan head type detection module 12.

In this technical scheme, the second transparent window 5 and the reflector 6 may be designed as a whole, and specifically, a reflective coating may be added on a 45-degree surface of the second transparent window 5.

The layered disposable oral digital impression apparatus scanning head also comprises an electric heating module 7 and an electric heating driving circuit 9; the electric heating module 7 and the electric heating driving circuit 9 are disposed in the fixed inner shell 2. The electric heating module 7 is arranged at the rear side of the reflector 6 and is the reflector 6 and the second transparent window 5 when the device is used, so that the fogging of the mirror surface is avoided. The electric heating module 7 is connected with an electric heating driving circuit 9 through a connecting cable 10, so that the temperature of the electric heating module 7 is controlled and is ensured to be in a constant temperature range.

In the technical scheme, the electric heating module 7 is preferably a PTC heating sheet, and the PTC heating body has the advantages of small thermal resistance and high heat exchange efficiency, and is an automatic constant-temperature and electricity-saving electric heater; can prevent that heating temperature is too high, prevent that equipment surface from overtemperature, reduce the risk in the aspect of the electrical safety overtemperature.

Compared with the prior art, the layered disposable oral digital impression apparatus scanning head has the following beneficial effects:

1) through the layered disposable design, before the digital scanning of the patient, the equipment does not need to be disinfected, and only the disposable part of the outer layer of the scanning head needs to be replaced, so that the use of the oral digital impression instrument in the sinking market is facilitated;

2.) the inner layer of the scanner is fixed with the hand piece, when a patient carries out digital scanning, only the disposable outer layer part needs to be replaced without replacing the inner shell, so that the repeated plugging and unplugging of the scanning head in the using process is reduced, and the risk that the joint of the scanning head and the handle is seriously loosened and even falls off after the scanning head is plugged and unplugged for multiple times is avoided;

3.) the scanning precision of the scanning head is improved through the internal structure of the scanning head and the design of electronic components; on one hand, the scanning head is fixedly connected with the handheld instrument through the inner layer, so that the deviation of the mounting position of the scanning head caused by repeated disassembly and replacement is avoided, and the accuracy of a scanned three-dimensional model of the teeth of a patient is ensured; on the other hand, the novel anti-fogging module is arranged in the scanning head, so that the anti-fogging effect is better, and the risk of influencing the final scanning precision due to lens fogging is reduced;

4.) the scanning head of the invention can be disposed of through the layering, the design is novel, simple in construction, have greatly reduced the use cost while each patient carries on the digitized scanning;

5.) the anti-fogging device of the invention has the advantages of small thermal resistance and high heat exchange efficiency, can prevent overhigh heating temperature, prevent the surface of equipment from being over-heated, and reduce the risk in the aspect of electrical safety over-temperature.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing is merely a detailed description of the present application, and it should be noted that modifications and embellishments could be made by those skilled in the art without departing from the principle of the present application, and these should also be considered as the protection scope of the present application.