Telescopic 3D printed osteotomy surgical guide with double locking structure

Abstract

The present invention discloses a telescopic 3D printed osteotomy surgical guide with a double locking structure, including a left plate body and a right plate body integrally formed by 3D printing, and a telescopic structure for realizing the relative telescopic extension of the left and right plates. With the osteotomy surgical guide of the present application, on the one hand, all components are integrally formed by 3D printing, and the components are mutually limited or nested, that is, the relative movement between the components is satisfied, and the mutual slippage between the components is avoided, which is beneficial to improve the safety and convenience of the surgical process. On the other hand, it has the function of telescopic adjustment, so that it is in a smaller volume state when placed in the incision, and adjusted to a larger volume state after being placed in the incision, which greatly improves the flexibility and convenience of the surgical process. After its volume deformation is completed, it can be stabilized in the working state to avoid being affected by the pulling of the maxillofacial muscles and affecting its volume and shape, ensuring the positioning accuracy, and at the same time, the double locking structure can prevent accidental unlocking.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a telescopic 3D printed osteotomy surgical guide plate with a double locking structure. Background Art

[0002] With the development and progress of modern social civilization, people are pursuing a higher quality of life while also paying more attention to their appearance and body shape. The mandible is an important component of the facial contour, and therefore becomes a key part of plastic surgery. Asian women often use "melon-seed face" as one of the specific expressions of aesthetics. On the contrary, an enlarged mandibular angle makes the face look too round and lacks the gentle and soft beauty of oriental women. Mandibular angle resection can remove the enlarged bone in the mandibular angle area, coordinate the proportion of the lower 1 / 3 of the face, and improve the facial shape. Therefore, it is favored by the majority of beauty lovers and has become one of the most commonly used procedures in oral and maxillofacial plastic surgery.

[0003] In the understanding and practice of mandibular angle hypertrophy plastic surgery, clinicians have also improved and perfected a series of surgical procedures, among which the most classic procedure is osteotomy. It uses a bone saw to symmetrically cut off a piece of arc-shaped bone on the surface of the bilateral mandibular angle and preserve the surrounding tissue, thereby shortening the width of the mandible and optimizing the length-width ratio of the face.

[0004] Computer-aided design and manufacturing provide strong technical support for oral and maxillofacial surgeons to accurately locate, cut and reconstruct the jaw. As a typical representative, 3D printing has high clinical application value in orthognathic surgery, reconstruction of the mandible and temporomandibular joint, and maxillofacial trauma. By using this technology to make osteotomy guides and positioning guides, doctors can accurately locate bones and design osteotomy plans and the positions of titanium plates and titanium nails before surgery, and accurately cut bones and reshape the jaw during surgery.

[0005] However, in actual applications, existing osteotomy surgical guides still have problems such as difficulty in accurately fitting with bone tissue, resulting in a deviation between the actual osteotomy range and the expected result, a large difference between the guide size and the surgical incision length, making it difficult to fix in place, and insufficient ductility and flexibility of the guide.

[0006] More specifically, the osteotomy surgical guide in the prior art has the following problems:

[0007] 1. Since mandibular angle resection surgery is mainly used for the treatment of mandibular plastic surgery, the incision is small, but the precision of the surgery is high. The surgery is often performed with a small incision in the mouth. Although the traditional personalized guide can improve the precision of the surgery, it is difficult to put it into the incision due to its large size and non-retractability, and it is easy to deviate when it is placed.

[0008] 2. Although some people have proposed using a puzzle-like structure to print the guide plate in blocks, due to the abundant muscle tissue around the jawbone, the guide plate lacks constraints during placement, and relative displacement between the puzzle pieces is likely to occur, resulting in reduced positioning accuracy.

[0009] 3. In traditional surgery without the use of a guide, positioning is entirely dependent on the surgeon's experience, which is highly subjective.

[0010] In view of this, an object of the present invention is to provide a telescopic 3D printed osteotomy surgical guide with a double locking structure so as to improve the positioning accuracy and the flexibility and convenience of the surgical procedure. Summary of the invention

[0011] In view of this, the present invention aims at addressing the deficiencies of the prior art and provides a telescopic 3D printed osteotomy surgical guide with a double locking structure, so as to improve the positioning accuracy and the flexibility and convenience of the surgical procedure.

[0012] The present invention solves the above-mentioned problem through the following technical means: a telescopic 3D printed osteotomy surgical guide with a double locking structure, characterized in that it includes a left plate body and a right plate body integrally formed by 3D printing, and a telescopic structure for realizing relative telescopic movement of the left and right plates.

[0013] Further, the telescopic structure includes an outer tube body, an inner tube body and a connecting bolt, the outer tube body and the inner tube body are respectively connected to the left plate body and the right plate body through a connecting body, the outer tube body and the inner tube body are slidably and telescopically matched and the slippage limitation is realized by the connecting bolt; the connecting bolt includes a square-shaped bolt body, a limit platform arranged on the bolt body for preventing the connecting bolt from axially slipping, and a bolt cap arranged at one end of the bolt body, the inner tube body is vertically penetrated by a through hole that is vertically slidably matched with the bolt body and convenient for the bolt body to rotate, the limit platform is located inside the inner tube body and the size of the limit platform is larger than the size of the through hole; a square groove that is matched and slidably matched with the bolt body is opened on the top of the outer tube body; an enlarged circular hole is opened at one end of the square groove close to the nesting end face of the outer tube body, and an anchoring port that is matched with the bolt body is opened at a position corresponding to the enlarged circular hole on the bottom surface of the outer tube body, and the anchoring port rotates relative to the projection of the square groove on the same plane.

[0014] Furthermore, the left plate body and the right plate body are spliced ​​together through a comb tooth structure to form an osteotomy surgical guide plate body.

[0015] Furthermore, the inner surface of the osteotomy surgical guide plate body forms an inwardly protruding structure that matches the bone surface.

[0016] Furthermore, the head of the plug body is processed with a wedge-shaped structure.

[0017] Furthermore, the head end of the wedge-shaped structure is a non-pointed structure.

[0018] Furthermore, the distance from the top surface of the limiting platform to the end surface of the bolt head is equal to the distance from the inner top surface to the outer bottom surface of the inner tube body.

[0019] Furthermore, the outer tube body and the inner tube body are both square tube bodies.

[0020] Furthermore, the limiting platform is a truncated cone structure.

[0021] Furthermore, the connector is a cylindrical structure.

[0022] Beneficial effects of the present invention:

[0023] 1. The osteotomy surgical guide has the function of telescopic adjustment, so that it is in a smaller volume state when placed in the incision, and is adjusted to a larger volume state (working state) after being placed in the incision, which greatly improves the flexibility and convenience of the surgical process. After its volume deformation is completed, it can be stabilized in the working state to avoid the influence of the maxillofacial muscle traction on its volume and shape, ensuring the accuracy of positioning.

[0024] 2. The osteotomy surgical guide has some functions of existing 3D guides, including: personalized combination, contact and constraint with the jawbone, which enables accurate and reliable positioning.

[0025] 3. The osteotomy surgical guide has multiple movable components, which is conducive to improving the flexibility of the surgical process. The movable components are in a mutually restricted state and cannot be separated from each other, ensuring the integrity of the surgical guide. This can further ensure the safety of the operation and prevent accidental injuries caused by the falling of small components during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] Figure 1 A top view of an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the splicing of the left plate and the right plate in an embodiment of the present invention;

[0029] Figure 3 Schematic diagram of the structure of the outer tube body;

[0030] Figure 4 is a schematic diagram of the structure of the inner tube body;

[0031] Figure 5 A schematic diagram of the structure of the connecting bolt. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0033] like Figure 1-5 As shown, a telescopic 3D printed osteotomy surgical guide with a double locking structure in this embodiment includes a left plate body 1 and a right plate body 2 formed by 3D printing and a telescopic structure for realizing relative telescopic movement of the left and right plates. The left plate body 1 and the right plate body 2 are spliced ​​together by a comb structure 7 to form the osteotomy surgical guide body, which is similar to the traditional spliced ​​guide, but also different. The main difference is that when the guide of the prior art is in a working state, that is, when it is stretched to the maximum state, there is almost no gap between the spliced ​​plate bodies; while the guide of this embodiment has a gap, which is conducive to improving the convenience of the surgical process. The inner surface of the osteotomy surgical guide body contacts the surface of the jaw, and uses a personalized morphological design so that it can be anchored with the jaw in a concave and convex manner; the outer surface is the reverse side of the inner surface, which is connected to the telescopic structure; the side reflects the thickness of the osteotomy surgical guide body. In this embodiment, the thickness is defined as greater than 1mm and less than 5mm. Too small a thickness will make the 3D printing material insufficient in strength, and too thick a thickness will waste materials and increase the product volume. However, when using different 3D printing materials, this size range can be adjusted to a certain extent. It is worth adding that in order to achieve a good retention and limiting effect, the inner surface of the osteotomy surgical guide body is generally located at the edge area of ​​the jawbone. Therefore, the inner surface of most osteotomy surgical guide bodies forms an inwardly protruding structure, that is, the guide is C-shaped when viewed from the side. This can make the guide more firmly and reliably located in the area near the mandibular angle.

[0034] The telescopic structure includes an outer tube body 3, an inner tube body 4 and a connecting bolt 5. The outer tube body 3 and the inner tube body 4 are respectively connected to the left plate body 1 and the right plate body 2 through a connecting body 6. The outer tube body 3 and the inner tube body 4 are slidably telescopically matched and the slipping limit is achieved through the connecting bolt 5. The connecting bolt 5 includes a square-shaped bolt body 502, a limit platform 503 arranged on the bolt body to prevent the connecting bolt from axially slipping, and a bolt cap 501 arranged at one end of the bolt body. A through hole 401 is vertically penetrated on the inner tube body 4, which is vertically slidably matched with the bolt body 502 and convenient for the bolt body to rotate. The limit platform 503 is located inside the inner tube body 4 and the size of the limit platform 503 is larger than the size of the through hole 401, so as to prevent the limit platform 503 from passing through the through hole 401 when the connecting bolt 5 slides axially, so as to prevent the connecting bolt 5 from being separated from the inner tube body 4 by the connection platform 503 and passing through the through hole 401. The top of the outer tube 3 is provided with a square groove 301 that matches and slides with the bolt body. During the telescopic process, the inner tube 4 and the connecting bolt 5 slide relative to the outer tube. The square groove 301 acts as a sliding guide. The length of the square groove 301 limits the sliding range of the inner tube and the connecting bolt. An enlarged circular hole 302 is provided at one end of the square groove 301. An anchoring opening 303 that matches the bolt body is provided at a position corresponding to the enlarged circular hole 302 on the bottom surface of the outer tube 3. The anchoring opening 303 is rotated at a certain angle relative to the projection of the square groove 301 on the same plane. The angle is 0-90°, preferably 45°. When the outer tube body 3 and the inner tube body 4 slide relative to each other to the working state (i.e. the left plate body and the right plate body are extended to the maximum size), the bolt body 502 just slides into the enlarged circular hole, and the bolt body can rotate freely at this time; rotate the bolt body to make the angle of the bolt body 502 consistent with the angle of the anchoring port 303, and then insert the end of the bolt body 502 away from the bolt cap into the anchoring port 303. Under the limitation of the anchoring port 303, the connecting bolt can neither rotate nor slide in the extension direction, so that the relative anchoring of the components of the surgical guide is achieved, so that the surgical guide is stabilized in the working state to avoid the effect of maxillofacial muscle traction and the influence on its volume and shape, and ensure the positioning accuracy. When the connecting bolt is anchored or released, the connecting bolt needs to go through two steps of rotation, insertion or lifting, and rotation. The connecting bolt ensures that the connecting bolt will not automatically open the connecting bolt in an unexpected state.

[0035] The key components of this embodiment are further described in detail below:

[0036] The outer tube body 3 is generally a square hollow tube, and its hollow area is also square, which is used to nest with the inner tube body 4. The top surface of the outer tube body 3 is provided with a square groove 301, and the length of the square groove 301 is determined by the comb structure 7, which restricts the comb structure 7 from being fully opened, but can be fully closed; the width of the square groove 301 is defined as W, and the groove position is in the middle of the top surface of the outer tube body, but cannot reach the end surfaces on both sides. An enlarged circular hole 302 is provided at one end of the square groove close to the nested end surface of the outer tube body, and the aperture of the enlarged circular hole is It is best to just allow the bolt to rotate freely.

[0037] The connector 6 on the outer tube body 3 is integrally formed on the rear side of the outer tube body, and the outer tube body 3 is fixedly connected to the left plate body 1 through the connector 6. An anchoring opening 303 matching the bolt body is provided on the bottom surface of the outer tube body 3 at a position corresponding to the enlarged circular hole 301, and the anchoring opening is rotated 45° relative to the projection of the square groove on the same plane, and the side length of the square groove is W.

[0038] An outer tube body of this structure is adopted. The square groove limits the bolt body to slide along the square groove, and the enlarged round hole connecting bolt can make the connecting bolt rotating at this position. Once the connecting bolt rotates, it will not be able to move in the square groove unless the connecting bolt is turned to the initial angle, thereby achieving the first locking, and the anchoring port allows the connecting bolt to be inserted after rotation to achieve the second locking. During the second locking, the connecting bolt cannot rotate freely. If the connecting bolt needs to be re-selected, it must be withdrawn from the anchoring port. Even after withdrawing from the anchoring port, the connecting bolt cannot move directly in the square groove, and must be rotated back to the initial angle so that the bolt body of the connecting bolt is consistent with the angle of the square groove before it can move, thereby achieving double locking.

[0039] The inner tube body 4 is a stepped square tube as a whole, and is also a hollow structure, and the hollow area is also square. The small diameter end of the inner tube body is matched with the outer tube body for sliding sleeve connection, and the rear side surface of the large diameter end is integrally formed with a connector fixedly connected to the right plate body.

[0040] The upper and lower side walls of the inner tube body are provided with through holes 301 which are vertically slidably matched with the bolt body and facilitate the rotation of the bolt body. The diameter of the through hole 301 is The stopper is located inside the inner tube body and the size of the stopper is larger than the size of the through hole, so as to prevent the stopper from passing through the through hole when the connecting bolt slides axially and causing the connecting bolt to be separated from the inner tube body.

[0041] The inner tube body of this structure has a small diameter end that matches and slides with the outer tube body; its inner cavity will accommodate most of the limit platform and the bolt body; its through hole satisfies the axial movement and rotation of the connecting bolt to achieve different limit functions.

[0042] The bolt body 502 of the connecting bolt 5 is a rectangular parallelepiped structure, and the cross section of the bolt body 502 is a square, and the side length of the square is W. The axial length of the bolt body 502 is greater than the height of the outer tube body, and the head end of the bolt body 502 is wedge-shaped. The wedge-shaped structure 504 will play a role in guiding the connecting bolt to be inserted into the anchoring port. The specific wedge-shaped structure is: a 45-degree bevel is cut from the edge to the bottom edge on one side of the bolt body, and the four edges are repeated. Among them, the four edges do not overlap when they are beveled to the bottom edge, leaving a certain bottom surface area, so that the incision does not present a sharp point, so as to avoid the connecting bolt being too sharp when exiting the limiting structure and causing medical staff to be stabbed. The cross section of the bolt cap is also square, and the side length of the bolt cap is 2W, which is relatively short in the axial direction, preferably between 2mm and 10mm. At the same time, for aesthetics, a chamfer can be set at the edge of the cap-shaped structure, that is, the turning point. The chamfer design will make the operation process easier, but this is not the core point of this patent. After removing the chamfer, the core function of this patent will not be changed. A circular stopper is provided in the middle of the bolt body, and the axial thickness of the stopper is 1-5 mm. The distance from the top surface of the stopper to the end surface of the bolt head is equal to the distance from the inner top surface to the outer bottom surface of the inner tube body, ensuring that when the connecting bolt slides, the end surface of the bolt head is in close contact with the inner bottom surface of the outer tube body and the top surface of the stopper is in close contact with the inner top surface of the inner tube body, so as to play the role of axial positioning.

[0043] The connecting bolt 5 can slide along the long axis direction with the inner tube body 4 relative to the outer tube body 3. When the connecting bolt 5 slides to the enlarged circular hole 302, the connecting bolt 5 can rotate 360 ​​degrees. However, only after the connecting bolt 5 exits the anchoring opening 303 and rotates to the same angle as the square groove 301, the bolt body 502 can slide into the square groove 301. Once the bolt body slides into the square groove, it cannot rotate or telescopically move along the axial direction.

[0044] The connector 6 may be cylindrical or in other shapes, and mainly serves to connect the guide plate and the telescopic structure.

[0045] The device is manufactured by 3D printing as a whole, and the overall anchoring printing method is adopted during manufacturing, that is, when the product is printed, the left plate body, the right plate body, the outer tube body, the inner tube body and the connecting bolt are in a nested state, and no further assembly is required. The 3D printing method is also conducive to the surface of the guide plate fitting the jaw bone to be as consistent as possible with the jaw bone morphology, so as to achieve accurate and reliable positioning.

[0046] The surgical guide can preferably provide assistance for mandibular angle resection surgery, and the specific operation is: first, the surgical guide folded to the smallest volume is placed into the wound through a hidden incision in the oral cavity; the volume is quickly transformed in the wound to unfold it to the largest volume; then a double anchoring structure is used to simply and quickly achieve double locking so that the working state of the instrument no longer continues to change; the surgical guide is further fixed in the mandible by utilizing the characteristics of the personalized matching anchoring structure of the mandible; then the required cutting position is marked by marking; after marking, the guide can be removed for mandibular cutting, or the guide can be retained and mandibular cutting can be performed based on the guide.

[0047] In addition, this project was carried out and designed with the support of the Hunan Natural Science Foundation (2017JJ2392), the Hunan Provincial Health and Family Planning Commission Scientific Research Project (B20180054), and the Changsha Science and Technology Plan Project (kq1706072), and has achieved good clinical practical value.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A telescopic 3D printed osteotomy surgical guide with a double locking structure, characterized in that: It includes a left plate body and a right plate body integrally formed by 3D printing, and a telescopic structure for realizing relative telescopic movement of the left and right plates; the telescopic structure includes an outer tube body, an inner tube body and a connecting bolt, the outer tube body and the inner tube body are respectively connected to the left plate body and the right plate body through a connecting body, the outer tube body and the inner tube body are slidably telescopically matched and the slip limit is realized by the connecting bolt; the connecting bolt includes a square-shaped bolt body, a limit platform arranged on the bolt body to prevent the connecting bolt from axially slipping, and a bolt cap arranged at one end of the bolt body, a through hole vertically penetrating the inner tube body is provided, which is vertically slidably matched with the bolt body and convenient for the bolt body to rotate, the limit platform is located inside the inner tube body and the size of the limit platform is larger than the size of the through hole; a square groove matching and slidingly matching with the bolt body is provided on the top of the outer tube body; an enlarged circular hole is provided at one end of the square groove close to the nested end face of the outer tube body, and an anchoring port matching with the bolt body is provided at a position corresponding to the enlarged circular hole on the bottom surface of the outer tube body, and the anchoring port rotates relative to the projection of the square groove on the same plane.

2. The telescopic 3D printed osteotomy surgical guide with a double locking structure according to claim 1, characterized in that: The left plate body and the right plate body are spliced ​​together through a comb-tooth structure to form an osteotomy surgical guide plate main body.

3. The telescopic 3D printed osteotomy surgical guide with a double locking structure according to claim 2, characterized in that: The inner surface of the osteotomy surgical guide plate body forms an inwardly protruding structure matching the bone surface.

4. The telescopic 3D printed osteotomy surgical guide with a double locking structure according to claim 3, characterized in that: The head of the bolt body is processed with a wedge-shaped structure.

5. The telescopic 3D printed osteotomy surgical guide with a double locking structure according to claim 4, characterized in that: The head end of the wedge-shaped structure is a non-pointed structure.

6. The telescopic 3D printed osteotomy surgical guide with a double locking structure according to claim 5, characterized in that: The distance from the top surface of the limiting platform to the end surface of the bolt head is equal to the distance from the inner top surface to the outer bottom surface of the inner tube body.

7. The telescopic 3D printed osteotomy surgical guide with a double locking structure according to claim 6, characterized in that: The outer tube body and the inner tube body are both square tube body structures.

8. The telescopic 3D printed osteotomy surgical guide with a double locking structure according to claim 7, characterized in that: The limiting platform is a truncated cone structure.

9. The telescopic 3D printed osteotomy surgical guide with a double locking structure according to claim 8, characterized in that: The connector is a cylindrical structure.

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