Mandibular super long curve osteotomy nerve locator

Abstract

The present invention relates to medical equipment, and in particular to a nerve locator for mandibular ultra-long curved osteotomy, comprising a tooth sleeve, a main rod, a slider, a positioning block, and a secondary rod. The main rod is marked with scales from top to bottom, and the slider is sleeved on the main rod. The tooth sleeve and the slider are connected by a connecting rod, and the slider is fixed to the main rod by a first screw through a set screw hole. Specifically, there are two tooth sleeves, which are arranged on both sides of the main rod, so that they are more stable when fixed. They are connected to the main rod by two connecting rods and two sliders respectively. The connecting rod is curved and extends from the inside of the human oral cavity to the outside of the human oral cavity. The positioning block is also sleeved on the main rod, and is fixed to the main rod by a second screw through a set screw hole, and the secondary rod is transversely arranged on the positioning block. The present invention can mark the position of the mandibular nerve canal during mandibular ultra-long curved osteotomy to effectively avoid it.

Description

Technical Field

[0001] The invention relates to medical instruments, in particular to a nerve locator for mandibular ultra-long curved osteotomy. Background Art

[0002] In the field of craniomaxillofacial surgery, for example, the mandibular super-long curve osteotomy refers to the removal of facial bones from the mandibular angle to the mandibular chin to create a natural and stunning small face, and to obtain a good side effect. It not only eliminates the hypertrophic mandibular angle, but also creates a perfect chin. When performing the long curve osteotomy, after confirming whether the correct design is made by hand or with a dental mirror, the osteotomy oscillating saw should be used to perform full-thickness osteotomy according to the pre-made marks. When performing osteotomy, the oscillating saw handle should be held steadily, and the oscillating saw should be vibrated at a high speed. The osteotomy should be performed from back to front, which can prevent the bone cutting line from rising toward the mandibular condyle and the surgeon's wrist from being stiff, and can create a softer curve. The mandibular super-long curve osteotomy also includes the submental osteotomy, which is a surgery to remove the lower edge of the chin at the joint position and obtain the required chin curve. It can also be understood as the bone cutting line of the long curve osteotomy extending to the center of the chin. Compared with T-shaped osteotomy, it does not need to be cut into several pieces of bone and fixed with steel plates, and has the advantages of simple surgical methods. During the operation, after the stripping is completed, use a pencil to mark the midline and osteotomy line on the chin, and confirm whether the inclination of the chin osteotomy line and the inclination of the mandibular body length curve osteotomy are natural, and then use a reciprocating saw to remove the lower edge of the chin. If the left and right osteotomy sites of the chin intersect at the midline, the chin will be too sharp and unnatural. Therefore, in order to obtain a more natural appearance, a flat part of 5 to 7 mm in the center of the chin should be retained. When performing the above operations, special attention should be paid to avoiding the mandibular nerve canal. In the prior art, the positioning of the mandibular nerve canal is all based on the reference of the CT scan line taken. In actual operation, it is avoided by experience, and there is no good reference for the position of the mandibular nerve canal during operation. Summary of the invention

[0003] The purpose of the present invention is to provide a mandibular super-long curved osteotomy nerve locator to solve the problem of marking the position of the mandibular nerve canal in mandibular super-long curved osteotomy.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] The mandibular ultra-long curved osteotomy nerve locator includes a tooth sleeve, a main rod, a slider, a positioning block, and a secondary rod. The main rod is marked with scales from top to bottom, the slider is sleeved on the main rod, the tooth sleeve and the slider are connected by a connecting rod, and the slider is fixed to the main rod by a first screw through a set screw hole; the positioning block is also sleeved on the main rod and fixed to the main rod by a second screw through a set screw hole, and the secondary rod is transversely arranged on the positioning block.

[0006] Preferably, there are two gear sleeves, which are arranged on both sides of the main rod and are connected to the main rod through two connecting rods and two sliding blocks respectively.

[0007] Preferably, the gear sleeve comprises two clips, a connecting portion is arranged at the upper end of the clips, and a third screw is arranged to pass through the connecting portion and the connecting rod to connect the connecting portion with the connecting rod.

[0008] Preferably, the clip is an arc-shaped piece with two sides bent inwards.

[0009] Preferably, the connection portion and the clip are connected in a stepped manner, and the distance between the two connection portions is smaller than the distance between the two clips.

[0010] Preferably, the connecting rod is curved, extending from inside the human oral cavity to outside the human oral cavity.

[0011] Preferably, the main rod is provided with a strip hole from top to bottom, the positioning block is provided with a plug hole corresponding to the position of the strip hole, and a marking rod is movably inserted through the plug hole and the strip hole.

[0012] Compared with the prior art, the present invention can produce at least one of the following beneficial effects: the present invention can mark the position of the mandibular nerve canal during super-long curved osteotomy of the mandible to effectively avoid it; the present invention is suitable for different human bodies and has strong applicability; the present invention has accurate marking and stable positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0015] Figure 1 The structure of the nerve locator for mandibular ultra-long curved osteotomy is shown, and several embodiments are listed below in conjunction with the illustrations.

[0016] Embodiment 1:

[0017] The mandibular ultra-long curved osteotomy nerve locator includes a tooth sleeve 1, a main rod 2, a slider 3, a positioning block 4, and a secondary rod 5. The main rod 2 is marked with scales from top to bottom. The slider 3 is sleeved on the main rod 2. The tooth sleeve 1 and the slider 3 are connected by a connecting rod 6, and the slider 3 is fixed to the main rod 2 by a first screw 7 through a set screw hole. Specifically, there are two tooth sleeves 1, which are arranged on both sides of the main rod 2, which are more stable when fixed. They are connected to the main rod 2 by two connecting rods 6 and two sliders 3 respectively. The connecting rod 6 is curved and extends from the inside of the human mouth to the outside of the human mouth. The positioning block 4 is also sleeved on the main rod 2 and fixed to the main rod 2 by a second screw 8 through a set screw hole. The secondary rod 5 is transversely arranged on the positioning block 4.

[0018] When in use, first perform a CT scan on the patient to obtain a mandibular scan image, mark the position of the mandibular nerve canal, select two teeth on both sides of the lowest point of the mandibular nerve canal in the image, loosen the first screw 7, adjust the position of the slider 3 so that the tooth sleeve 1 corresponds to the position of the teeth, and then fix the first screw 7. Then loosen the second screw 8, adjust the position of the positioning block 4 so that the lower edge of the auxiliary rod 5 is located outside the lowest point of the mandibular nerve canal, and then fix the second screw 8. Then select a slider 3, measure the image distance X2 from it to the lower edge of the patient's mandible and the image distance X1 from it to the lowest point of the mandibular nerve canal. During the operation, the tooth sleeve 1 is put on the actual teeth of the patient, and then the real distance h2 from the selected slider 3 to the lower edge of the patient's mandible is measured to see if it is consistent with the image distance of the lower edge of the patient's mandible. If it is consistent, the operation can be performed along the lower edge of the auxiliary rod 5 to avoid the mandibular nerve canal. If it is inconsistent, the real distance from the slider 3 to the lowest point of the mandibular nerve canal is calculated according to the ratio: the image distance X2 from the slider 3 to the lower edge of the patient's mandible: the image distance X1 from the slider 3 to the lowest point of the mandibular nerve canal = the real distance h2 from the slider 3 to the lower edge of the patient's mandible: the real distance h1 from the slider 3 to the lowest point of the mandibular nerve canal, and then the second screw 8 is loosened to adjust the position of the positioning block 4 so that the lower edge of the auxiliary rod 5 is located outside the calculated lowest point of the mandibular nerve canal. At this time, the operation can be performed along the lower edge of the auxiliary rod 5 to avoid the mandibular nerve canal. It is convenient and quick to use, accurate in positioning, and will not cause other harm to the patient.

[0019] Embodiment 2:

[0020] On the basis of Example 1, specifically, the tooth sleeve 1 includes two clips 1-1, the clips 1-1 are arc-shaped pieces with both sides bent inward, which are convenient for fitting the teeth and clamping the teeth, and the upper end of the clips 1-1 is provided with a connecting part 1-2, and a third screw 9 is provided to pass through the connecting part 1-2 and the connecting rod 6 to connect the connecting part 1-2 with the connecting rod 6. It is convenient to adjust the angle of the clips 1-1 to adapt to the shape of the teeth.

[0021] Embodiment 3:

[0022] On the basis of Example 2, specifically, the connection part 1-2 and the clip 1-1 are connected in a stepped manner, and the distance between the two connection parts 1-2 is smaller than the distance between the two clips 1-1, so as to make the clip 1-1 fit the teeth more closely.

[0023] Best embodiment:

[0024] The mandibular ultra-long curved osteotomy nerve locator comprises a tooth sleeve 1, a main rod 2, a slider 3, a positioning block 4, and a secondary rod 5. The main rod 2 is marked with scales from top to bottom. The slider 3 is sleeved on the main rod 2. The tooth sleeve 1 and the slider 3 are connected by a connecting rod 6, and the slider 3 is fixed to the main rod 2 by a first screw 7 through a set screw hole. Specifically, there are two tooth sleeves 1, which are arranged on both sides of the main rod 2, and are more stable when fixed. They are connected to the main rod 2 by two connecting rods 6 and two sliders 3 respectively. The connecting rod 6 is curved and extends from the inside of the human oral cavity to the outside of the human oral cavity. Specifically, the tooth sleeve 1 comprises two clips 1-1. The clip 1-1 is an arc-shaped piece with both sides bent inward, which is convenient for fitting the teeth and clamping the teeth. A connecting part 1-2 is arranged on the upper end of the clip 1-1. The connecting part 1-2 and the clip 1-1 are connected in a stepped manner. The distance between the two connecting parts 1-2 is smaller than the distance between the two clips 1-1. A third screw 9 is provided to pass through the connecting portion 1-2 and the connecting rod 6 to connect the connecting portion 1-2 with the connecting rod 6. This facilitates adjusting the angle of the clip 1-1 to adapt to the shape of the tooth.

[0025] The positioning block 4 is also sleeved on the main rod 2 and fixed to the main rod 2 by the second screw 8 through the screw hole, and the auxiliary rod 5 is transversely arranged on the positioning block 4. The main rod 2 is provided with a strip hole 10 from top to bottom, and the positioning block 4 is provided with a plug hole 11 corresponding to the position of the strip hole 10, and a marking rod 12 is movably inserted through the plug hole 11 and the strip hole 10.

[0026] When in use, the patient is first subjected to a CT scan to obtain a mandibular scan image, and the position of the mandibular nerve canal is marked. Two teeth on both sides of the lowest point of the mandibular nerve canal in the image are selected, the first screw 7 is loosened, the position of the slider 3 is adjusted so that the tooth sleeve 1 corresponds to the position of the teeth, and then the first screw 7 is fixed. Then the marking rod 12 is inserted through the jack 11, the second screw 8 is loosened, the position of the positioning block 4 is adjusted so that the lower edge of the auxiliary rod 5 is located outside the lowest point of the mandibular nerve canal, and then the second screw 8 is fixed. In this process, since there is a certain distance between the positioning block 4 and the image, it is difficult to judge whether the positioning block 4 has moved to the lowest point of the mandibular nerve canal. The setting of the marking rod 12 allows the tip of the marking rod 12 to contact the image paper surface, which plays a good marking role for the position of the positioning block 4. After the second screw 8 is fixed, the marking rod 12 can be pulled out. Then a slider 3 is selected to measure the image distance X2 from the lower edge of the patient's mandible and the image distance X1 from the lowest point of the mandibular nerve canal. During the operation, the tooth sleeve 1 is put on the actual teeth of the patient, and then the real distance h2 from the selected slider 3 to the lower edge of the patient's mandible is measured to see if it is consistent with the image distance of the lower edge of the patient's mandible. If it is consistent, the operation can be performed along the lower edge of the auxiliary rod 5 to avoid the mandibular nerve canal. If it is inconsistent, the real distance from the slider 3 to the lowest point of the mandibular nerve canal is calculated according to the ratio: the image distance X2 from the slider 3 to the lower edge of the patient's mandible: the image distance X1 from the slider 3 to the lowest point of the mandibular nerve canal = the real distance h2 from the slider 3 to the lower edge of the patient's mandible: the real distance h1 from the slider 3 to the lowest point of the mandibular nerve canal, and then the second screw 8 is loosened to adjust the position of the positioning block 4 so that the lower edge of the auxiliary rod 5 is located outside the calculated lowest point of the mandibular nerve canal. At this time, the operation can be performed along the lower edge of the auxiliary rod 5 to avoid the mandibular nerve canal. It is convenient and quick to use, accurate in positioning, and will not cause other harm to the patient.

[0027] When multiple illustrative embodiments are mentioned in this specification, it means that the specific structure described in conjunction with the embodiment is included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when a structure is described in conjunction with any embodiment, it is claimed that the structure is implemented in conjunction with other embodiments within the scope of the present invention.

Claims

1. Mandibular ultra-long curved osteotomy nerve locator, characterized by: The invention comprises a gear sleeve (1), a main rod (2), a slider (3), a positioning block (4), and a secondary rod (5); the main rod (2) is marked with scales from top to bottom; the slider (3) is sleeved on the main rod (2); the gear sleeve (1) and the slider (3) are connected via a connecting rod (6); and the slider (3) is fixed to the main rod (2) via a first screw (7) through a provided screw hole; the positioning block (4) is also sleeved on the main rod (2) and fixed to the main rod (2) via a second screw (8) through a provided screw hole; and the secondary rod (5) is transversely arranged on the positioning block (4); The gear sleeves (1) are two in number, which are arranged on both sides of the main rod (2) and are connected to the main rod (2) via two connecting rods (6) and two sliding blocks (3) respectively; The gear sleeve (1) comprises two clips (1-1), a connecting portion (1-2) is provided at the upper end of the clip (1-1), and a third screw (9) is provided to pass through the connecting portion (1-2) and the connecting rod (6) to connect the connecting portion (1-2) and the connecting rod (6).

2. The nerve locator for mandibular ultra-long curved osteotomy according to claim 1, characterized in that: The clip (1-1) is an arc-shaped piece with two sides bent inwards.

3. The nerve locator for mandibular ultra-long curved osteotomy according to claim 1, characterized in that: The connecting portion (1-2) and the clip (1-1) are connected in a stepped manner, and the distance between the two connecting portions (1-2) is smaller than the distance between the two clips (1-1).

4. The nerve locator for mandibular ultra-long curved osteotomy according to claim 1, characterized in that: The connecting rod (6) is in a curved shape, extending from the inside of the human oral cavity to the outside of the human oral cavity.

5. The nerve locator for mandibular ultra-long curved osteotomy according to claim 1, characterized in that: The main rod (2) is provided with a strip hole (10) from top to bottom, the positioning block (4) is provided with an insertion hole (11) corresponding to the position of the strip hole (10), and a marking rod (12) is movably inserted through the insertion hole (11) and the strip hole (10).

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