3D-printed scaphoid fracture guide needle implantation guide plate

Abstract

The utility model belongs to the technical field of medical instruments for fracture, and provides a 3D printed scaphoid fracture guide needle implantation guide plate which comprises a positioning guide plate and a guide needle guide plate, and the positioning guide plate is used for being attached between a first carpal joint bony protrusion and a lister nodule of a human body before fracture reduction; a first needle sleeve and a second needle sleeve are arranged on the positioning guide plate at an interval and are respectively used for penetrating a first guide needle and a second guide needle; a third needle cannula, a fourth needle cannula and a fifth needle cannula are arranged on the needle guide plate at intervals, the needle guide plate is used for being attached to the position between a first carpal joint bony protrusion and a lister nodule of the human body after fracture reduction, and the third needle cannula and the fourth needle cannula are used for penetrating through a first guide needle and a second guide needle. And the fifth needle cannula is used for penetrating a third guide needle to enable the third guide needle to penetrate through the fracture part. The device can be directly placed in an ideal position through the positioning guide plate and the needle guide plate, so that the needle threading frequency and the X-ray irradiation frequency are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical instruments for fractures and provides a 3D printed guide pin insertion guide plate for scaphoid fractures. Background Art

[0002] The scaphoid bone is a carpal bone. It is the longest and largest of the proximal carpal bones. It is long and arc-shaped, like a boat. Among all carpal fractures, 82% to 89% are related to scaphoid fractures. The scaphoid has poor blood supply, and healing after fracture is almost entirely primary healing, with little callus formation. Therefore, scaphoid fractures require high fracture reduction. Only under the premise of anatomical reduction and compression fixation of the fracture ends can the fracture be more likely to heal.

[0003] At present, the mainstream treatment method is closed reduction and hollow compression screw fixation technology. In order to achieve anatomical reduction and strong fixation, the compression screw needs to be placed in a reasonable position through a guide needle to achieve satisfactory mechanical stability. To achieve this goal, clinicians need to repeatedly adjust the position of the guide needle under X-rays. This will increase the destruction of the scaphoid bone and may even cause the inserted hollow compression screw fixation to fail. In addition, this also increases the amount of radiography for clinicians, endangering the health of clinicians and patients. Utility Model Content

[0004] In order to solve the above problems, the purpose of the utility model is to provide a 3D printed scaphoid fracture guide pin insertion guide plate. The utility model can directly insert the guide plate into the ideal position through the positioning guide plate and the guide pin guide plate, thereby reducing the number of needle insertions and X-ray irradiations.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is:

[0006] A 3D printed scaphoid fracture guide pin insertion guide plate, comprising a positioning guide plate and a guide pin guide plate, wherein the positioning guide plate is used to fit between the bony protrusion of a first carpometacarpal joint and the lister tubercle of a human body before fracture reduction; a first needle sleeve and a second needle sleeve are arranged on the positioning guide plate at intervals, respectively used to insert a first guide pin and a second guide pin so that the first guide pin and the second guide pin pass through the bones at both ends of the fracture site; a third needle sleeve, a fourth needle sleeve and a fifth needle sleeve are arranged on the guide pin guide plate at intervals, the guide pin guide plate is used to fit between the bony protrusion of a first carpometacarpal joint and the lister tubercle of a human body after fracture reduction, and the third needle sleeve and the fourth needle sleeve are used to insert the first guide pin and the second guide pin, and the fifth needle sleeve is used to insert the third guide pin so that the third guide pin passes through the fracture site, and the extension line of the center line of the fifth needle sleeve intersects with the fracture line.

[0007] The positioning guide is obtained by 3D printing before the operation according to the 3D optical scanning image of the patient's hand and based on the acquired hand geometric contour model and fracture position.

[0008] In the present invention, preferably, the guide needle guide plate is obtained by 3D printing after the first guide needle and the second guide needle have completed the insertion and the fracture reduction, by simulating the positions of the first guide needle and the second guide needle after the fracture reduction through 3D software, and then designing the third needle cannula, the fourth needle cannula and the guide needle guide plate based on the positions of the first guide needle and the second guide needle, and designing the fifth needle cannula according to the fracture position.

[0009] In the present invention, preferably, the angle between the extension line of the center line of the fifth needle cannula and the fracture line is 80-100°.

[0010] In the present invention, preferably, the width of the positioning guide plate and the guide needle guide plate is 1-2 cm.

[0011] In the present invention, preferably, the length of the positioning guide plate and the guide needle guide plate is 4-8 cm.

[0012] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0013] The positioning guide plate of the utility model is obtained by 3D printing based on the 3D optical scanning image of the patient's hand and the acquired hand geometric contour model and fracture position before the operation; the guide pin guide plate is obtained by 3D printing on the basis of simulating the positions of the first guide pin and the second guide pin after the fracture reduction by 3D software after the first and second guide pins have completed the insertion of the needles and the reduction of the fracture after the reduction of the fracture. By using the guide plate of the utility model, during the operation, the guide pin used to fix the fracture seam can be directly placed in the ideal position through the guide plate, making the operation more accurate and simple, reducing the number of needle insertions and the number of X-ray exposures, and reducing the pain of repeated needle insertions and the risk of excessive X-ray projections. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the positioning guide provided by the utility model.

[0015] Figure 2 It is a use schematic diagram of the positioning guide plate provided by the utility model.

[0016] Figure 3 It is a structural schematic diagram of the guide needle and guide plate provided by the utility model.

[0017] Figure 4 It is a schematic diagram of the use of the guide needle and guide plate provided by the utility model.

[0018] Among them, 1-positioning guide plate, 101-first guide needle, 102-first needle cannula, 103-second needle cannula, 104-second guide needle, 2-bone fracture, 3-guide needle guide plate, 301-third guide needle, 302-fifth needle cannula, 303-third needle cannula, 304-fourth needle cannula. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The drawings are only used for exemplary descriptions, and only schematic diagrams are shown, not physical drawings, and cannot be understood as limitations on this patent. In order to better illustrate the specific implementation methods of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures, parts and their descriptions in the drawings may be omitted. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this utility model.

[0020] See also Figure 1-4 The utility model provides a 3D printed guide plate for inserting a guide pin for a scaphoid fracture, comprising a positioning guide plate 1 and a guide pin guide plate 3. The two guide plates are used before and after fracture reduction during surgery, respectively.

[0021] See also Figure 1-2 The positioning guide plate 1 is used to fit between the bony protrusion of the first carpometacarpal joint and the lister tubercle of the human body before fracture reduction; the positioning guide plate 1 is provided with a first needle sleeve 102 and a second needle sleeve 103 at intervals, which are used to insert the first guide needle 101 and the second guide needle 104 respectively so that the first guide needle 101 and the second guide needle 104 pass through the bones at both ends of the fracture site, and the first guide needle 101 and the second guide needle 104 are used for positioning the position of the guide needle guide plate 3 in the next step.

[0022] Specifically, in the utility model, the positioning guide plate 1 is designed in a 3D printing system before surgery according to a 3D optical scanning image of the patient's hand, such as a preoperative hand CT, and based on the acquired hand geometric contour model and fracture position, the first needle cannula 102 and the second needle cannula 103 are designed on the positioning guide plate 1, and the designed positioning guide plate 1 is printed by a 3D printer, so that the positioning guide plate 1 is personalized and can better fit the patient's hand. Preferably, the positioning guide plate 1 has a width of 1-2 cm and a length of 4-8 cm.

[0023] Continue to see Figure 3 and Figure 4A third needle cannula 303, a fourth needle cannula 304 and a fifth needle cannula 302 are arranged on the guide needle guide plate 3 at intervals. The guide needle guide plate 3 is used to fit between the bony protrusion of the first carpometacarpal joint and the lister tubercle of the human body after fracture reduction, and the third needle cannula 303 and the fourth needle cannula 304 are used to pass through the first guide needle 101 and the second guide needle 104, and the fifth needle cannula 302 is used to penetrate the third guide needle 301 so that the third guide needle 301 passes through the fracture seam 2, and the extension line of the center line of the fifth needle cannula 302 intersects with the fracture line.

[0024] Specifically, in the present invention, the guide needle guide plate 3 is obtained by 3D printing after the first guide needle 101 and the second guide needle 104 are inserted, and the positions of the first guide needle 101 and the second guide needle 104 after fracture reduction are simulated by 3D software, and then the third needle sleeve 303, the fourth needle sleeve 304 and the guide needle guide plate 3 are designed based on the positions of the first guide needle 101 and the second guide needle 104, and the fifth needle sleeve 302 is designed according to the fracture position. Preferably, the width of the guide needle guide plate 3 is 1-2 cm and the length is 4-8 cm.

[0025] In the present invention, when the guide needle guide plate 3 is designed using 3D software, the extension line of the center line of the fifth needle sleeve 302 intersects with the fracture line, thereby ensuring that the hollow pressure screw can pass through the fracture suture 2 smoothly through the third guide needle 301, so that the third guide needle 301 and the hollow pressure screw can be directly placed in the ideal position through the fifth needle sleeve 302, making the surgical operation more accurate and simple, reducing the number of needle insertions and the number of X-ray irradiation times, and reducing the pain of repeated needle insertions and the risk of excessive X-ray projections. Preferably, the extension line of the center line of the fifth needle sleeve 302 is approximately perpendicular to the fracture line. Since the fracture suture 2 is not necessarily in a straight line, the extension line of the center line of the fifth needle sleeve 302 is preferably at an angle of 80-100° to the fracture line.

[0026] Based on the structure of the above embodiment, the specific use and principle of the 3D printed scaphoid fracture guide pin insertion guide plate described in the utility model are as follows:

[0027] At present, the treatment of scaphoid fracture requires repeated adjustment of the position of the guide pin under X-ray, which is likely to increase the destruction of the scaphoid bone and may even cause the inserted hollow compression screw to fail to fix. Therefore, accurately locating the position of the hollow screw is the key to improving surgical accuracy. The utility model designs two guide plates to solve the above problems.

[0028] Before the operation, the patient's hand is CT scanned to obtain the geometric contour model of the hand and the fracture position, and the positioning guide plate 1 is designed in the 3D printing system. The first needle cannula 102 and the second needle cannula 103 are designed on the guide plate. The two needle cannulae are spaced a certain distance apart, and the designed positioning guide plate 1 is printed by a 3D printer. Using 3D printing technology, the positioning guide plate 1 can be personalized and better fit the patient's hand.

[0029] To perform the operation, first, the positioning guide plate 1 is fitted between the bony protrusion of the patient's first carpometacarpal joint and the lister tube, and the first needle cannula 102 and the second needle cannula 103 are located at both ends of the fractured scaphoid bone, and the first guide needle 101 and the second guide needle 104 are inserted into the first needle cannula 102 and the second needle cannula 103 so that the first guide needle 101 and the second guide needle 104 pass through the bones at both ends of the fracture site.

[0030] The fracture is manually reduced. According to the positions of the first guide needle 101 and the second guide needle 104 after reduction, the positions of the first guide needle 101 and the second guide needle 104 after reduction are simulated in 3D software. Based on the positions, the third needle sleeve 303, the fourth needle sleeve 304 and the guide needle guide plate 3 are designed. According to the fracture position, the fifth needle sleeve 302 is designed. The design requires that the extension line of the center line of the fifth needle sleeve 302 intersects with the fracture line. The guide needle guide plate 3 is 3D printed.

[0031] Remove the positioning guide plate 1, pass the third needle cannula 303 and the fourth needle cannula 304 through the first guide needle 101 and the second guide needle 104, place the guide needle guide plate 3, and make the guide needle guide plate 3 completely fit the skin. At this time, the first guide needle 101 and the second guide needle 104 play a positioning role. Since the positions of the first guide needle 101, the second guide needle 104 and the third guide needle 301 that is about to be inserted into the fifth needle cannula 302 are relatively fixed, the extension line of the center line of the fifth needle cannula 302 intersects with the fracture line. At this time, the third guide needle 301 is inserted from the fifth needle cannula and penetrates to the distal pole of the scaphoid bone, then the third guide needle 301 will definitely pass through the fracture line.

[0032] After the third guide needle 301 is inserted, after confirming that the position is good by X-ray during the operation, a hollow compression screw is inserted into the third guide needle 301, and the first guide needle 101, the second guide needle 104, and the guide needle guide plate 3 are removed to complete the operation.

[0033] Through the design of the utility model, the hollow compression screw can be directly inserted into the ideal position of the fracture seam 2 through the fifth needle sleeve 302 and the third guide needle 301, making the surgical operation more precise and simple, reducing the number of needle insertions and X-ray irradiations, and reducing the pain of repeated needle insertions and the risk of excessive X-ray exposures.

[0034] The above description is a detailed description of the preferred feasible embodiment of the utility model, but the embodiment is not used to limit the scope of the patent application of the utility model. All equivalent changes or modified changes completed under the technical spirit suggested by the utility model should fall within the patent scope covered by the utility model.

Claims

1. A 3D printed guide pin insertion guide plate for scaphoid fracture, characterized in that: It comprises a positioning guide plate and a guide needle guide plate, wherein the positioning guide plate is used to fit between the bony protrusion of the first carpometacarpal joint and the lister tubercle of the human body before fracture reduction; the positioning guide plate is provided with a first needle sleeve and a second needle sleeve at intervals, which are respectively used to insert the first guide needle and the second guide needle so that the first guide needle and the second guide needle pass through the bones at both ends of the fracture site; the guide needle guide plate is provided with a third needle sleeve, a fourth needle sleeve and a fifth needle sleeve at intervals, the guide needle guide plate is used to fit between the bony protrusion of the first carpometacarpal joint and the lister tubercle of the human body after fracture reduction, and the third needle sleeve and the fourth needle sleeve are used to insert the first guide needle and the second guide needle, and the fifth needle sleeve is used to insert the third guide needle so that the third guide needle passes through the fracture site, and the extension line of the center line of the fifth needle sleeve intersects with the fracture line.

2. The guide pin insertion guide plate for scaphoid fracture according to claim 1, characterized in that: The positioning guide is obtained by 3D printing before the operation according to the 3D optical scanning image of the patient's hand and based on the acquired hand geometric contour model and fracture position.

3. The guide pin insertion guide plate for wrist scaphoid fracture according to claim 1, characterized in that: The guide needle guide plate is obtained by 3D printing after the first guide needle and the second guide needle have completed the insertion and the fracture reduction, by simulating the positions of the first guide needle and the second guide needle after the fracture reduction through 3D software, and then designing the third needle sleeve, the fourth needle sleeve and the guide needle guide plate based on the positions of the first guide needle and the second guide needle, and designing the fifth needle sleeve according to the fracture position.

4. The guide pin insertion guide plate for scaphoid fracture according to claim 1, characterized in that: The angle between the extension line of the center line of the fifth needle cannula and the fracture line is 80-100°.

5. The guide pin insertion guide plate for scaphoid fracture according to claim 1, characterized in that: The width of the positioning guide plate and the guide needle guide plate is 1-2 cm.

6. The guide pin insertion guide plate for scaphoid fracture according to claim 1, characterized in that: The lengths of the positioning guide plate and the guide needle guide plate are 4-8 cm.

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