Oral radiotherapy fixed separation device

Abstract

The present invention provides an oral radiotherapy fixing and separation device, belonging to the technical field of medical devices. It solves the problem that cotton yarn needs to be stuffed when performing radiotherapy on buccal membrane tumors, and the stuffing before each radiotherapy is not accurate and consistent, and the resetting is poor, which will cause the position of the target area to change, thereby affecting the accuracy of radiotherapy. The oral radiotherapy fixing and separation device includes an oral bracket for opening the patient's mouth, the upper part of the oral bracket is provided with a first tooth socket, the lower part of the oral bracket is provided with a second tooth socket, the rear part of the oral bracket is provided with a tongue depressor, and the side part of the oral bracket is provided with an extension bracket. The extension bracket props the buccal membrane target area away from the gums, while ensuring the accuracy and consistency of the stuffing, and can replace the method of pushing the two apart with stuffing cotton yarn, multi-point fixation, good positioning repeatability, and high accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices and relates to an oral radiotherapy fixing and separating device. Background Art

[0002] Radiotherapy is widely used in the treatment of head and neck malignant tumors, but various acute and chronic radiation injuries caused by radiotherapy, such as oral mucosal damage, taste damage, and difficulty opening the mouth, seriously affect the quality of life of patients. The main factor for these radiotherapy side effects is that the poor fixation of oral tissues during radiotherapy leads to low precision of reduction, and normal tissues are damaged by unnecessary irradiation.

[0003] To this end, a Chinese patent discloses an upper and lower separated stent for oral radiotherapy [authorization announcement number is CN104043205B], which includes a stent body, which is a hollow shell, and its external shape matches the shape of the oral cavity when a person opens his mouth; the front part of the stent body is a fixed part, and the upper surface shell and the lower surface shell of the fixed part are respectively provided with an upper dentition pressure groove and a lower dentition pressure groove; the rear part of the stent body is a supporting tongue depressing part, the upper surface of the supporting tongue depressing part is the palatal surface of the stent, and the lower surface of the supporting tongue depressing part is the lingual surface of the stent; the fixed part and the supporting tongue depressing part are connected by an air-permeable channel.

[0004] For buccal tumors in head and neck tumors, the gingiva needs to be separated from the buccal membrane during radiotherapy in order to reduce the radiation dose of normal gingival tissue adjacent to the target area. The current method is to wear the above-mentioned bracket first, and then fill the buccal membrane target area and the gingiva with cotton gauze to fully separate the buccal membrane from the gingiva. Before subsequent radiotherapy, filling is required each time to ensure the accuracy of resetting. Since it is impossible to keep the filling consistent before each radiotherapy, the position of the buccal membrane target area changes, which in turn affects the accuracy of radiotherapy. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems in the prior art and to provide an oral radiotherapy fixation and separation device which can accurately reposition the buccal membrane target area.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] The oral radiotherapy fixation and separation device comprises an oral bracket for opening the patient's mouth, wherein the upper portion of the oral bracket is provided with a first tooth socket, the lower portion of the oral bracket is provided with a second tooth socket, the rear portion of the oral bracket is provided with a tongue depressor, and the side portion of the oral bracket is provided with an extension bracket, wherein the extension bracket is used to separate the buccal membrane from the gums.

[0008] The extension bracket is integrally formed with the oral bracket or detachably connected. The extension bracket supports the buccal membrane target area and fully isolates the buccal membrane target area from the gums, increases the distance between the buccal membrane target area and the gums, protects the gums from dose irradiation during radiotherapy, and reduces related complications. In order to prevent the extension bracket from damaging the buccal membrane, the side of the extension bracket facing the buccal membrane is a smooth surface, preferably a curved surface that matches the inner surface of the buccal membrane.

[0009] An extended bracket can be made according to the range and position of the buccal membrane target area: when the buccal membrane target area is only located on the left side of the patient, the extended bracket is located on the left side of the oral bracket; when the buccal membrane target area is only located on the right side of the patient, the extended bracket is located on the right side of the oral bracket; when the buccal membrane target area exists on both sides of the patient, extended brackets are provided on both sides of the oral bracket.

[0010] Among them, the first and second alveoli are designed according to the thickness of Chinese teeth and the shape of dental arches, which are suitable for most patients and have strong versatility. The production process and time are reduced, and patients can use it without waiting. Specifically, the depth of the first alveolus is 1mm to 5mm, the arc is 45° to 120°, the width of the second alveolus at both ends is greater than the width of the middle, the width of the two ends is 3 to 9mm, and the width of the middle part is 1 to 5mm.

[0011] In the above-mentioned oral radiotherapy fixation and separation device, the oral bracket includes an upper pressure plate and a lower pressure plate, the first tooth socket is arranged at the upper part of the upper pressure plate, the second tooth socket is arranged at the lower part of the lower pressure plate, a movable plate is arranged between the upper pressure plate and the lower pressure plate, the extension bracket is fixed on the movable plate, and a locking structure is arranged between the upper pressure plate and the lower pressure plate for fixing the upper pressure plate, the movable plate and the lower pressure plate together when the movable plate is moved into place.

[0012] The movable plate can move between the upper pressing plate and the lower pressing plate, thereby changing the relative position of the extension bracket and the oral bracket, and the extension bracket can be adjusted to a position that meets the treatment requirements.

[0013] In the above-mentioned oral radiotherapy fixation and separation device, the locking structure includes a first screw hole provided on the upper pressure plate, a second screw hole provided on the lower pressure plate, and a screw rod passing through the first screw hole and the second screw hole, and a nut is threadedly connected to the screw rod.

[0014] The screw includes a rod head and a rod body with external threads, and the nut is matched with the thread of the rod body. After the connection is completed, the rod head and the nut work together to clamp the upper pressing plate, the moving plate and the lower pressing plate, so the connection is reliable and the operation is convenient.

[0015] In the above-mentioned oral radiotherapy fixation and separation device, the first screw hole and / or the second screw hole is in the shape of an elongated strip, and the length direction thereof extends along the front-to-back direction.

[0016] The screw can move forward and backward along the first threaded hole and / or the second threaded hole, thereby changing the relative position of the upper pressure plate and the lower pressure plate in the front-to-back direction, thereby achieving the purpose of changing the relative position of the first alveolar socket and the second alveolar socket in the front-to-back direction, making it suitable for patients with front-to-back misalignment of upper and lower teeth, and has good versatility.

[0017] The structures of the first screw hole and the second screw hole have the following three situations: 1. The cross-section of the first screw hole is elliptical, and the cross-section of the second screw hole is circular. At this time, the front and rear positions of the screw rod in the first screw hole can be changed, so as to achieve the purpose of changing the relative positions of the upper pressing plate and the lower pressing plate in the front and rear directions; 2. The cross-section of the first screw hole is circular, and the cross-section of the second screw hole is elliptical. At this time, the front and rear positions of the screw rod in the second screw hole can be changed, so as to achieve the purpose of changing the relative positions of the upper pressing plate and the lower pressing plate in the front and rear directions; 3. The cross-section of the first screw hole is elliptical, and the cross-section of the second screw hole is also elliptical. At this time, the front and rear positions of the screw rod in the first screw hole and the second screw hole can be changed, so as to achieve the purpose of changing the relative positions of the upper pressing plate and the lower pressing plate in the front and rear directions.

[0018] In the above oral radiotherapy fixation and separation device, the locking structure includes a threaded hole provided on the lower pressing plate, a through hole provided on the upper pressing plate, and a screw rod passing through the through hole and threadedly connected to the threaded hole. After the connection is completed, the rod head of the screw rod presses on the upper pressing plate.

[0019] In the above-mentioned oral radiotherapy fixation and separation device, the through hole is in the shape of a long strip, and its length direction extends in the front-to-back direction. The screw can move forward and backward along the through hole, thereby changing the relative position of the upper pressing plate and the lower pressing plate in the front-to-back direction, achieving the purpose of changing the relative position of the first alveolar and the second alveolar in the front-to-back direction, making it suitable for patients with front-to-back misalignment of the upper and lower teeth, and having good versatility.

[0020] In the above-mentioned oral radiotherapy fixation and separation device, a thickness adjustment plate for adjusting the distance between the upper pressing plate and the lower pressing plate is also provided between the upper pressing plate and the lower pressing plate, and the thickness adjustment plate is located between the upper pressing plate and the movable plate and / or the lower pressing plate and the movable plate.

[0021] One or more thickness adjustment plates of appropriate thickness can be selected according to the size of the patient's oral cavity, and the oral cavity can be opened to an appropriate degree in coordination with the upper pressing plate and the lower pressing plate.

[0022] The thickness adjustment plates have the following three distribution situations: one or more thickness adjustment plates are located only between the upper pressing plate and the movable plate; one or more thickness adjustment plates are located only between the lower pressing plate and the movable plate; there are multiple thickness adjustment plates, and thickness adjustment plates are provided between the upper pressing plate and the movable plate and between the lower pressing plate and the movable plate.

[0023] In the above-mentioned oral radiotherapy fixation and separation device, the thickness adjustment plate and / or the movable plate are provided with ventilation holes extending forward and backward to prevent the wearer from experiencing respiratory distress and improve the wearing comfort.

[0024] In the above-mentioned oral radiotherapy fixing and separating device, the thickness adjustment plate and the movable plate are both provided with a U-shaped groove extending in the front-to-back direction, and the screw rod is inserted into the U-shaped groove.

[0025] During adjustment, the U-shaped groove provides a space for the screw rod to make way. The U-shaped groove is an open groove with an opening toward the rear of the oral bracket. When the screw rod abuts against the bottom of the groove, the extended bracket moves into the oral cavity to a maximum distance.

[0026] In the above-mentioned oral radiotherapy fixation and separation device, a first handle is provided at the front end of the upper pressing plate, and a second handle is provided at the front end of the lower pressing plate.

[0027] The first handle and the second handle extend forward to facilitate the placement of the oral bracket. When the locking structure includes a first screw hole, a second screw hole and a screw rod, the first screw hole is arranged on the first handle, and the second screw hole is arranged on the second handle. When the locking structure includes a threaded hole, a through hole and a screw rod, the through hole is arranged on the first handle, and the threaded hole is arranged on the second handle.

[0028] In the above-mentioned oral radiotherapy fixation and separation device, the upper part of the upper pressing plate is provided with a first retaining tooth portion located in front of the first alveolar portion; the lower part of the lower pressing plate is provided with a second retaining tooth portion located in front of the second alveolar portion.

[0029] The first tooth stop portion protrudes upward from the upper surface of the upper pressing plate to resist the upper teeth and prevent the oral bracket from extending too deeply. The second tooth stop portion protrudes downward from the lower surface of the lower pressing plate to resist the lower teeth and prevent the oral bracket from extending too deeply.

[0030] When used for positioning, the screw passes through the first screw hole, the U-shaped groove and the second screw hole to connect the upper pressure plate, the movable plate, the thickness adjustment plate and the lower pressure plate. The position of the extended bracket is adjusted to a position that meets the treatment needs by moving the movable plate back and forth. At the same time, the oral bracket is adjusted to an appropriate thickness according to the treatment needs, and finally tightened with a nut.

[0031] During installation, the end of the oral bracket with the first handle and the second handle is directed toward the outside of the oral cavity, and the fixing and separating device is placed obliquely into the patient's oral cavity, the upper pressing plate contacts the hard palate surface, the lower pressing plate contacts the tongue surface, the upper dentition is fixed in the first alveolar socket, the lower dentition is fixed in the second alveolar socket, the tongue pressing part presses the tongue body, and the extended bracket props the buccal membrane target area away from the gums. During subsequent radiotherapy, the fixing and separating device fixed during positioning can be placed in the oral cavity for use.

[0032] Compared with the prior art, the oral radiotherapy fixation and separation device has the following advantages:

[0033] The first tooth socket and the second pressure groove are designed according to the thickness of Chinese teeth and the shape of dental arches. They are suitable for most patients and have strong versatility. The production process and time are reduced, and patients can use them without waiting. The thickness of the oral stent is adjusted by adding or removing the thickness adjustment plate to achieve the thickness required for treatment, and it is highly flexible. The extended stent supports the buccal membrane target area while fully isolating the buccal membrane target area from the gums, increasing the distance between the two, protecting the gums from dose exposure during radiotherapy, and reducing related complications. The movable plate can drive the extended stent to move, and the extended stent can be adjusted to a position that meets the treatment needs. It has strong versatility and a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a side view of the oral radiotherapy fixing and separating device provided by the present invention.

[0035] Figure 2 It is a front view of the oral radiotherapy fixing and separating device provided by the present invention.

[0036] Figure 3 It is a top view of the oral radiotherapy fixing and separation device provided by the present invention.

[0037] Figure 4 It is a bottom view of the lower pressing plate provided by the present invention.

[0038] Figure 5 It is a top view of the upper pressing plate provided by the present invention.

[0039] Figure 6 It is a top view of the movable plate and the extension bracket provided by the present invention.

[0040] Figure 7 It is a top view of the thickness adjustment plate provided by the present invention.

[0041] In the figure, 1, first tooth socket; 2, second tooth socket; 3, tongue pressing part; 4, extension bracket; 5, upper pressure plate; 6, lower pressure plate; 7, movable plate; 8, first screw hole; 9, second screw hole; 10, screw rod; 11, nut; 12, thickness adjustment plate; 13, vent hole; 14, U-shaped groove; 15, first handle; 16, second handle; 17, first gear part; 18, second gear part. DETAILED DESCRIPTION

[0042] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0043] Embodiment 1

[0044] The oral radiotherapy fixing and separation device comprises an oral bracket for opening the patient's mouth, wherein a first tooth socket 1 is provided at the upper portion of the oral bracket, a second tooth socket 2 is provided at the lower portion of the oral bracket, a plate-shaped tongue depressing portion 3 is provided at the rear portion of the oral bracket, and an extension bracket 4 is integrally formed at the side portion of the oral bracket. The extension bracket 4 supports the buccal membrane target area while fully isolating the buccal membrane target area from the gums, thereby increasing the distance between the buccal membrane target area and the gums, protecting the gums from dose irradiation during radiotherapy, and reducing related complications.

[0045] In this embodiment, the first alveolar socket 1 and the second alveolar socket 2 are designed according to the thickness of Chinese teeth and the shape of dental arches, and are suitable for most patients. They are highly versatile, thereby reducing the production process and time, and patients can use them without waiting. Specifically, the first alveolar socket 1 has a depth of 1mm to 5mm and an arc of 45° to 120°. The widths of the two ends of the second alveolar socket 2 are greater than the width of the middle part, the widths of the two ends are 3 to 9mm, and the width of the middle part is 1 to 5mm.

[0046] The extension bracket 4 can be made according to the range and position of the buccal membrane target area: when the buccal membrane target area is only located on the left side of the patient, the extension bracket 4 is located on the left side of the oral bracket; when the buccal membrane target area is only located on the right side of the patient, the extension bracket 4 is located on the right side of the oral bracket; when the buccal membrane target area exists on both sides of the patient, the extension bracket 4 can be set on both sides of the oral bracket.

[0047] In order to prevent the wearer from experiencing respiratory distress and improve wearing comfort, a ventilation hole 13 extending forward and backward is provided through the oral support.

[0048] The entire production process uses 3D printing technology, which is fast and effective.

[0049] Embodiment 2

[0050] The structural principle of this embodiment is basically the same as that of the first embodiment, except that the position of the extension bracket 4 relative to the oral bracket can be changed, which is achieved by the following structure: the oral bracket includes an upper pressure plate 5 and a lower pressure plate 6, the first alveolar 1 is arranged at the upper part of the upper pressure plate 5, the second alveolar 2 is arranged at the lower part of the lower pressure plate 6, a movable plate 7 is provided between the upper pressure plate 5 and the lower pressure plate 6, the extension bracket 4 is fixed on the movable plate 7, and the movable plate 7 can move between the upper pressure plate 5 and the lower pressure plate 6, thereby changing the relative position of the extension bracket 4 and the oral bracket, and the extension bracket 4 can be adjusted to a position that meets the treatment requirements. When the movable plate 7 is moved into place, the upper pressure plate 5, the movable plate 7 and the lower pressure plate 6 are fixed together by a locking structure.

[0051] The locking structure in this embodiment includes a first screw hole 8 provided on the upper pressing plate 5, a second screw hole 9 provided on the lower pressing plate 6, and a screw rod 10 passing through the first screw hole 8 and the second screw hole 9, and a nut 11 is threadedly connected to the screw rod 10. The screw rod 10 includes a rod head and a rod body with external threads, and the nut 11 is threadedly matched with the rod body. After the connection is completed, the upper pressing plate 5, the movable plate 7 and the lower pressing plate 6 are clamped under the joint action of the rod head and the nut 11, and the connection is reliable and easy to operate.

[0052] The second screw hole 9 is in a long strip shape, and its length direction extends in the front-to-back direction. The screw rod 10 can move forward and backward along the second screw hole 9, thereby changing the relative position of the upper pressing plate 5 and the lower pressing plate 6 in the front-to-back direction, so as to achieve the purpose of changing the relative position of the first alveolar 1 and the second alveolar 2 in the front-to-back direction, so that it is suitable for patients with front-to-back misalignment of the upper and lower teeth, and has good versatility.

[0053] Furthermore, a U-shaped groove 14 extending in the front-to-back direction may be provided on the movable plate 7 , and the screw rod 10 is passed through the U-shaped groove 14 , so that the U-shaped groove 14 provides a clearance space for the screw rod 10 .

[0054] Embodiment 3

[0055] like Figure 1 , Figure 2 and Figure 3 The oral radiotherapy fixing and separation device shown comprises an oral bracket for opening the patient's oral cavity and an extension bracket 4 connected to the oral bracket. The extension bracket 4 supports the buccal membrane target area and fully isolates the buccal membrane target area from the gums, thereby increasing the distance between the buccal membrane target area and the gums, protecting the gums from dose irradiation during radiotherapy, and reducing related complications. In order to prevent the extension bracket 4 from damaging the buccal membrane, the side of the extension bracket 4 facing the buccal membrane is a smooth surface, preferably a curved surface that matches the inner surface of the buccal membrane.

[0056] The extended bracket 4 replaces the method of using cotton gauze to separate the buccal membrane target area and the gums, avoiding the change of the target area position due to inconsistent cotton gauze, ensuring the consistency of the separation state of the buccal membrane target area and the gums during positioning and subsequent treatment, ensuring the accuracy of reduction, and improving the accuracy of radiotherapy.

[0057] Specifically, Figure 1 As shown, the oral bracket includes an upper pressing plate 5 and a lower pressing plate 6. The upper portion of the upper pressing plate 5 is provided with a first tooth socket 1. The front portion of the first tooth socket 1 is provided with a first tooth stopper 17. The first tooth stopper 17 protrudes upward from the upper surface of the upper pressing plate 5 to resist the upper teeth and prevent the oral bracket from extending too deep. Figure 1 As shown, the lower part of the lower pressing plate 6 is provided with a second tooth socket 2, and the front part of the second tooth socket 2 is provided with a second tooth stop portion 18, which protrudes downward from the lower surface of the lower pressing plate 6 to resist the lower teeth and prevent the oral bracket from extending too deep. Figure 1As shown, a tongue pressing portion 3 is provided at the rear of the lower pressing plate 6 .

[0058] In this embodiment, the first alveolar socket 1 and the second alveolar socket 2 are designed according to the thickness of Chinese teeth and the shape of dental arches, and are suitable for most patients. They are highly versatile, thereby reducing the production process and time, and patients can use them without waiting. Specifically, the first alveolar socket 1 has a depth of 1mm to 5mm and an arc of 45° to 120°. The widths of the two ends of the second alveolar socket 2 are greater than the width of the middle part, the widths of the two ends are 3 to 9mm, and the width of the middle part is 1 to 5mm.

[0059] In order to facilitate the placement of oral brackets, Figure 1 and Figure 5 As shown, the front end of the upper pressing plate 5 is provided with a first handle 15. Figure 1 and Figure 4 As shown, a second handle 16 is provided at the front end of the lower pressing plate 6, and the first handle 15 and the second handle 16 extend forward.

[0060] In order to facilitate the movement of the extension bracket 4, Figure 1 and Figure 2 As shown, a movable plate 7 is provided between the upper pressing plate 5 and the lower pressing plate 6. The movable plate 7 can move between the upper pressing plate 5 and the lower pressing plate 6. The extension bracket 4 is fixed on the movable plate 7, thereby changing the relative position of the extension bracket 4 and the oral bracket. The extension bracket 4 can be adjusted to a position that meets the treatment requirements.

[0061] According to the needs of buccal tumor treatment, the extension bracket 4 can be placed on the left side of the oral bracket or on the right side of the oral bracket. When two movable plates 7 are superimposed between the upper pressure plate 5 and the lower pressure plate 6, the extension bracket 4 can be present on both the left and right sides at the same time.

[0062] A locking structure is also provided between the upper pressing plate 5 and the lower pressing plate 6 for fixing the upper pressing plate 5, the moving plate 7 and the lower pressing plate 6 together after the moving plate 7 is moved into place.

[0063] like Figure 1-3 As shown, the locking structure includes a first screw hole 8 provided on the first handle 15, a second screw hole 9 provided on the second handle 16, and a screw rod 10 passing through the first screw hole 8 and the second screw hole 9, and a nut 11 is threadedly connected to the screw rod 10. The screw rod 10 includes a rod head and a rod body with external threads, and the nut 11 is threadedly matched with the rod body. After the connection is completed, the upper pressing plate 5, the moving plate 7 and the lower pressing plate 6 are clamped under the joint action of the rod head and the nut 11, and the connection is reliable and easy to operate.

[0064] like Figure 4As shown, the second screw hole 9 is in a long strip shape, and its length direction extends in the front-to-back direction. The screw rod 10 can move forward and backward along the second screw hole 9, thereby changing the relative position of the upper pressing plate 5 and the lower pressing plate 6 in the front-to-back direction, achieving the purpose of changing the relative position of the first alveolar 1 and the second alveolar 2 in the front-to-back direction, making it suitable for patients with front-to-back misalignment of the upper and lower teeth, and having good versatility.

[0065] In some other embodiments, the first screw hole 8 is in the shape of an elongated strip, and its length direction extends in the front-to-back direction. At this time, the screw rod 10 can move forward and backward along the first screw hole 8, thereby changing the relative position of the upper pressing plate 5 and the lower pressing plate 6 in the front-to-back direction, thereby achieving the purpose of changing the relative position of the first alveolar socket 1 and the second alveolar socket 2 in the front-to-back direction.

[0066] In other embodiments, the first screw hole 8 and the second screw hole 9 are both in the shape of long strips, and the length direction thereof extends along the front-to-back direction, so that the upper pressing plate 5 and the lower pressing plate 6 have a wider adjustable range.

[0067] In order to adjust the distance between the upper pressing plate 5 and the lower pressing plate 6, as shown in FIG. Figure 1 and Figure 2 As shown, a thickness adjustment plate 12 is provided between the movable plate 7 and the lower pressing plate 6. The thickness specifications of the thickness adjustment plate 12 are 10mm, 5mm, 2mm and 1mm. The thickness of the oral bracket can be adjusted by increasing or decreasing the thickness adjustment plate 12 according to treatment needs.

[0068] like Figure 2 As shown, the thickness adjustment plate 12 and the movable plate 7 are provided with ventilation holes 13 extending forward and backward, so as to prevent the wearer from experiencing respiratory distress and improve the wearing comfort.

[0069] like Figure 6 and Figure 7 As shown, the thickness adjustment plate 12 and the movable plate 7 are both provided with a U-shaped groove 14 extending in the front-to-back direction, and the screw 10 is inserted into the U-shaped groove 14. The movable plate 7 can move forward and backward through the U-shaped groove 14, and the forward and backward movement of the movable plate 7 drives the extension bracket 4 to move forward and backward. The thickness of the movable plate 7 is 2mm to 15mm, and the height of the extension bracket 4 is 10mm to 35mm. The extension bracket 4 is made according to the target area range, and the position can be fixed. During adjustment, the U-shaped groove 14 provides a space for the screw 10 to make way. Among them, the U-shaped groove 14 is an open groove with an opening toward the rear of the oral bracket. When the screw 10 abuts against the bottom of the slot, the extension bracket 4 moves into the oral cavity to the maximum distance.

[0070] The entire production process uses 3D printing technology, which is fast and effective.

[0071] When used for positioning, the screw 10 passes through the first screw hole 8, the U-shaped groove 14 and the second screw hole 9 to connect the upper pressure plate 5, the movable plate 7, the thickness adjustment plate 12 and the lower pressure plate 6. The position of the extension bracket 4 is adjusted to a position that meets the treatment requirements by moving the movable plate 7 forward and backward. At the same time, the oral bracket is adjusted to an appropriate thickness according to the treatment requirements, and finally fastened with a nut 11.

[0072] During installation, the end of the oral bracket with the first handle 15 and the second handle 16 is directed toward the outside of the oral cavity, and the fixing and separating device is placed obliquely into the patient's oral cavity, the upper pressing plate 5 contacts the hard palate surface, the lower pressing plate 6 contacts the tongue surface, the upper dentition is fixed in the first alveolar 1, the lower dentition is fixed in the second alveolar 2, the tongue depressor 3 presses the tongue body, and the extension bracket 4 props the buccal membrane target area away from the gums. During subsequent radiotherapy, the fixing and separating device fixed during positioning can be placed in the oral cavity for use.

[0073] Embodiment 4

[0074] The structural principle of this embodiment is basically the same as that of the second or third embodiment, except that the locking structure includes a threaded hole provided on the lower pressing plate 6, a through hole provided on the upper pressing plate 5, and a screw rod 10 passing through the through hole and threadedly connected to the threaded hole. After the connection is completed, the rod head of the screw rod 10 is pressed on the upper pressing plate 5.

[0075] The through hole is in the shape of a long strip, and its length direction extends in the front-to-back direction. The screw rod 10 can move forward and backward along the through hole, thereby changing the relative position of the upper pressing plate 5 and the lower pressing plate 6 in the front-to-back direction, so as to achieve the purpose of changing the relative position of the first alveolar 1 and the second alveolar 2 in the front-to-back direction, making it suitable for patients with front-to-back misalignment of the upper and lower teeth, and having good versatility.

[0076] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An oral radiotherapy fixation and separation device, comprising an oral bracket for opening a patient's oral cavity, wherein the upper portion of the oral bracket is provided with a first tooth socket (1), the lower portion of the oral bracket is provided with a second tooth socket (2), and the rear portion of the oral bracket is provided with a tongue depressor (3), characterized in that: An extension bracket (4) is provided on the side of the oral bracket, and the extension bracket (4) is used to separate the buccal membrane from the gums; the oral bracket comprises an upper pressing plate (5) and a lower pressing plate (6), the first tooth socket (1) is provided on the upper part of the upper pressing plate (5), the second tooth socket (2) is provided on the lower part of the lower pressing plate (6), a movable plate (7) is provided between the upper pressing plate (5) and the lower pressing plate (6), the extension bracket (4) is fixed on the movable plate (7), and the upper pressing plate A locking structure is provided between the upper pressing plate (5) and the lower pressing plate (6) for fixing the upper pressing plate (5), the movable plate (7) and the lower pressing plate (6) together when the movable plate (7) is moved into position; a thickness adjustment plate (12) is also provided between the upper pressing plate (5) and the lower pressing plate (6) for adjusting the distance between the upper pressing plate (5) and the lower pressing plate (6), and the thickness adjustment plate (12) is located between the upper pressing plate (5) and the movable plate (7) and / or between the lower pressing plate (6) and the movable plate (7). The thickness adjustment plate (12) and the movable plate (7) are both provided with a U-shaped groove (14) extending in the front-to-back direction, and the screw (10) is inserted into the U-shaped groove (14); the locking structure comprises a first screw hole (8) provided on the upper pressing plate (5), a second screw hole (9) provided on the lower pressing plate (6), and a screw (10) inserted into the first screw hole (8) and the second screw hole (9), a nut (11) being threadedly connected to the screw (10), the first screw hole (8) and / or the second screw hole (9) being in the shape of an elongated strip, and the length direction of the first screw hole (8) and / or the second screw hole (9) being in the shape of an elongated strip, and the length direction of the first screw hole being in the shape of an elongated strip, and the length direction of the first screw hole being in the shape of an elongated strip; the thickness adjustment plate (12) and / or the movable plate (7) are provided with a vent hole (13) extending in the front-to-back direction.

2. The oral radiotherapy fixation and separation device according to claim 1, characterized in that: A first handle (15) is provided at the front end of the upper pressing plate (5), and a second handle (16) is provided at the front end of the lower pressing plate (6).

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