Hand fixation device for scaphoid navigation surgery

Abstract

The present application relates to the field of navigation surgery instrument, especially to a hand fixing instrument for scaphoid navigation surgery, which mainly comprises a base, a placing platform, a fixing brace, a tracer and a rotating mechanism, wherein the placing platform comprises a placing plate and a transmission part, the placing plate has a placing end face and a connecting end face, the transmission part is arranged on the connecting end face and rotationally connected with the base, the fixing brace is arranged on the placing end face and forms a constraint space, the tracer is arranged on the placing end face, and the rotating mechanism is rotationally connected with the base, the rotating mechanism can drive the placing plate to rotate relative to the base through the transmission part, so that the pose of the tracer and the fixing brace in space changes synchronously, and the placing plate can be kept at the position after rotation, so that the pose of the tracer and the fixing brace in space remains unchanged.

Description

Technical Field

[0001] This invention relates to the field of instruments for navigation surgery, and more particularly to a hand fixation instrument for scaphoid navigation surgery. Background Technology

[0002] In clinical practice, there are two main treatments for scaphoid fractures: conservative treatment and surgical treatment. Surgical treatment methods include: closed reduction and percutaneous Kirschner wire fixation, open reduction and Kirschner wire fixation, closed reduction and percutaneous cannulated screw fixation, and open reduction and cannulated screw fixation.

[0003] With the development of orthopedic navigation surgery technology, this technology has been increasingly applied to various orthopedic surgeries. In navigation surgery, a tracer is needed to work with the navigation system to track the location of the surgical area in real time, enabling patients to perform precise, minimally invasive, and effective fracture reduction and internal fixation.

[0004] During scaphoid navigation surgery, the patient's palm must face upwards, and a flexible object is placed under the wrist to elevate it, allowing the hand to fully extend in the position corresponding to the scaphoid bone. The tracer is then installed on the patient's scaphoid bone via a 1.5mm fixation pin or guide pin. In this method, the length and elasticity of the fixation pin or guide pin can cause constant oscillation, resulting in continuous changes in the spatial orientation of the tracer acquired by the navigation system. At the same time, the lack of restraint on the patient's hand can lead to displacement during the surgery, making it difficult to determine the exact position of the scaphoid bone in space, which is detrimental to the surgical procedure. Summary of the Invention

[0005] To address the aforementioned issues, this application discloses a hand fixation device for scaphoid navigation surgery. During navigation surgery, the device can adjust the patient's hand to the optimal surgical position based on the direction and angle of the surgical guide needle when it is inserted into the scaphoid bone. At the same time, it can also restrain the patient's hand, ensuring that the position of the patient's scaphoid bone in space is always clear during the surgery.

[0006] To achieve the above objectives, this application adopts the following technical solution, which includes:

[0007] Base;

[0008] A placement platform, comprising a placement plate and a transmission unit, wherein the placement plate has a placement end face and a connection end face, and the transmission unit is disposed on the connection end face and is rotatably connected to the base;

[0009] A fixed support is provided on the placement end face, wherein the fixed support forms a constrained space;

[0010] A tracer is disposed on the placement end face;

[0011] A rotating mechanism is rotatably connected to the base. The rotating mechanism can drive the placement plate to rotate relative to the base through the transmission part, so that the position of the tracer and the fixed support in space changes synchronously. It can also keep the placement plate in the rotated position, so that the position of the tracer and the fixed support in space remains unchanged.

[0012] In one illustrative embodiment of a hand fixation device for scaphoid navigation surgery, the transmission unit includes:

[0013] An arc-shaped helical toothed rack, which is pivotally connected to the base;

[0014] The rotating mechanism includes:

[0015] A rotating sleeve is pivotally connected to the base.

[0016] A helical gear, wherein the helical gear is sleeved on the rotating sleeve and meshes with the arc-shaped helical rack;

[0017] A locking element is sleeved on one end of the rotating sleeve. The locking element is movable between a locked position and a working position in the axial extension direction of the rotating sleeve. After the locking element moves from the locked position to the working position, the locking element can drive the helical gear to rotate synchronously through the rotating sleeve, thereby driving the arc-shaped helical rack to rotate the placement plate. When the locking element is in the locked position, the locking element can restrict the rotation of the helical gear.

[0018] In one illustrative embodiment of a hand fixation device for scaphoid navigation surgery, the base further comprises: a locking rod;

[0019] In the length extension direction of the locking member, the locking member includes a locking end, a connecting section and an abutting end connected in sequence, wherein the outer side of the locking end is provided with a plurality of positioning grooves, and in the locked position, one end of the locking rod extends into one of the positioning grooves.

[0020] In one illustrative embodiment of a hand fixation device for scaphoid navigation surgery, the rotating mechanism further includes a spring, wherein the spring abuts against the abutment end and provides a thrust to the locking member so that the locking member is always in the locked position, and when the locking member moves from the locked position to the working position, the locking rod disengages from the positioning groove, and the abutment end presses the spring.

[0021] In one illustrative embodiment of a hand fixation device in scaphoid navigation surgery, the fixation device includes:

[0022] The brace body has a constraint space formed inside it, and the brace body has an inlet and an outlet communicating with the constraint space. An operating port communicating with the constraint space is also provided on the upper surface of the brace body.

[0023] A plurality of capsules are disposed within the constrained space, wherein the plurality of capsules are capable of expanding within the constrained space to contract the constrained space.

[0024] In one illustrative embodiment of a hand fixation device in scaphoid navigation surgery, the capsule includes:

[0025] The first capsule located on the upper surface of the constrained space;

[0026] A second bladder and a third bladder are located on the lower surface of the constraint space, wherein the second bladder and the first bladder are opposite each other in the height extension direction of the brace body;

[0027] In the length extension direction of the brace body, the second bladder and the third bladder are arranged at intervals on the lower surface of the constraint space;

[0028] The upper surface of the main body of the brace is also provided with a connection interface, which is connected to the pipelines of the first bladder, the second bladder, and the third bladder.

[0029] In one illustrative embodiment of the hand fixation device in scaphoid navigation surgery, the first bladder, the second bladder, and the third bladder are air bladders.

[0030] In one illustrative embodiment of a hand fixation device for scaphoid navigation surgery, the main body of the device is detachably connected to the placement end face.

[0031] In one illustrative embodiment of a hand fixation device for scaphoid navigation surgery, the tracer includes: a connecting rod, one end of which is connected to the placement end face, and the other end of which extends away from the placement end face in the thickness direction of the placement end face;

[0032] The frame is connected to the end of the connecting rod away from the placement end face, wherein several tracer balls are installed on the side of the frame facing away from the connecting rod.

[0033] In one illustrative embodiment of a hand fixation device for scaphoid navigation surgery, the frame is rotatable relative to the connecting rod in a direction perpendicular to the axis of the connecting rod.

[0034] The following description, in a clear and easy-to-understand manner and with reference to the accompanying drawings, will further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of the hand fixation device for scaphoid navigation surgery using preferred embodiments. Attached Figure Description

[0035] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0036] Figure 1 A schematic diagram illustrating a possible implementation of a hand fixation device for scaphoid navigation surgery.

[0037] Figure 2 This is a schematic diagram illustrating the structure of the placement plate.

[0038] Figure 3 A schematic diagram illustrating the structure of the rotating part.

[0039] Figure 4 A schematic diagram illustrating the structure of the rotating mechanism.

[0040] Figure 5 A schematic diagram illustrating the fit between an arc-shaped helical rack and a helical gear.

[0041] Figure 6 This is a structural diagram illustrating the tilted state of the placement plate.

[0042] Figure 7 A cross-sectional schematic diagram used to illustrate the rotating mechanism.

[0043] Figure 8 This is a schematic diagram illustrating the structure of the locking mechanism.

[0044] Figure 9 This is a structural diagram illustrating the locking mechanism in the locked position.

[0045] Figure 10 This is a structural diagram illustrating the locking mechanism in its working position.

[0046] Figure 11 This is a structural diagram illustrating the main body of the support.

[0047] Figure 12 This is a structural diagram illustrating the inlet and outlet of the support body.

[0048] Figure 13 This is a schematic diagram illustrating the structure of the constrained space, the first capsule, the second capsule, and the third capsule.

[0049] Figure 14 This is a schematic diagram illustrating the structure of the tracer.

[0050] Label Explanation

[0051] 1. Base; 11. First connecting arm; 111. First rotating shaft; 12. Locking rod; 2. Placement platform; 21. Placement plate; 211. Placement end face; 212. Connecting end face; 22. Rotating part; 221. Arc-shaped helical rack; 222. Support frame; 3. Fixed support; 31. Support body; 311. Inlet; 312. Outlet; 313. Operating port; 32. First bladder; 33. Second bladder; 34. Third 35. Enclosure; 36. Connection interface; 4. Tracker; 41. Connecting rod; 42. First connecting piece; 43. Second connecting piece; 44. Frame; 441. Tracker ball; 5. Rotating mechanism; 51. Second connecting arm; 52. Second rotating shaft; 521. Abutment plate; 53. Rotating sleeve; 54. Helical gear; 55. Locking element; 551. Locking end; 552. Connecting section; 553. Abutment end; 56. Spring. Detailed Implementation

[0052] To provide a clearer understanding of the technical features, objectives, and effects of this application, specific embodiments of this application are now described with reference to the accompanying drawings. In the drawings, the same reference numerals indicate components with the same or similar structures but the same function.

[0053] In this document, “illustrative” means “serving as an example, illustration or description”, and any illustration or implementation described herein as “illustrative” should not be construed as a more preferred or advantageous technical solution.

[0054] To keep the drawings concise, only the parts relevant to this application are shown schematically in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components with the same structure or function is shown schematically, or only one of them is labeled.

[0055] See Figure 1 , Figure 2 The hand fixation instruments used in scaphoid navigation surgery include: a base 1, a placement platform 2, a fixation brace 3, a tracer 4, and a rotation mechanism 5, such as... Figure 2 , 3 As shown, the base 1 has two connecting arms that are opposite to each other. Both connecting arms extend in the thickness direction of the base 1. The two first connecting arms 11 are provided with a first rotating shaft 111 on the side facing away from each other, and the two first rotating shafts 111 are located at the end of the first connecting arm 11 away from the base 1.

[0056] The placement platform 2 includes a placement plate 21 and a rotating part 22. The placement plate 21 has a placement end face 211 and a connecting end face 212. (Refer to...) Figure 1 The placement end face 211 is the side facing away from the base 1, and the fixing support 3 and the tracer 4 are installed on the placement end face 211.

[0057] A rotating part 22 is provided on the connecting end face 212, and the rotating part 22 is rotatably connected to the first rotating shaft 111 of the two connecting arms, such as... Figure 2 As shown, the rotating part 22 includes an arc-shaped helical rack 221 (1 / 2 helical gear). The two ends of the arc-shaped helical rack 221 are fixedly connected to the connecting end face 212 of the placement plate 21, so that when rotating, it drives the placement plate 21 to rotate synchronously.

[0058] refer to Figure 3 A support frame 222 is provided on the inner side of the arc-shaped helical rack 221. A connecting channel is provided through the support frame 222 in the width direction of the placement plate 21. The first rotating shaft 111 is inserted into the connecting channel. When the arc-shaped helical rack 221 rotates around the axis of the connecting channel, it can drive the placement plate 21 to rotate synchronously, thereby changing the spatial position of the fixation bracket 3 and the tracer 4. In specific use, the surgeon selects the direction of the guide needle insertion according to the position of the patient's scaphoid fracture line, and then drives the placement plate 21 to rotate, thereby adjusting the patient's hand to the ideal position for CT imaging and guide needle insertion.

[0059] refer to Figure 1 The fixation brace 3 has a constraint space 35 that can restrain the patient's hand posture. When in use, the patient's hand is inserted into the constraint space 35, which restricts the patient's hand and prevents the patient's hand from shifting relative to the placement plate 21 or the fixation brace 3 during the operation. This ensures that the positional relationship between the patient's scaphoid bone and the placement plate 21 is determined, so that the position of the patient's scaphoid bone can be determined under the navigation system.

[0060] refer to Figure 1 The tracer 4 is installed on the placement end face 211. As will be understood by those skilled in the art, the position of the tracer 4 on the placement end face 211 should avoid the surgical area to avoid obstructing the surgical area. At the same time, it should also provide sufficient surgical space for the surgeon to avoid interfering with the surgeon's limb movements.

[0061] The tracer 4 is mainly used to be identified by the navigation system in order to calculate the position of the instrument in space. The tracer 4 can be an optical reference frame. As can be understood by those skilled in the art, before performing scaphoid navigation surgery, the three-dimensional model of the instrument is imported into the navigation system. Then, when the navigation system tracks the instrument through the tracer 4, it can calculate the real-time status of the instrument.

[0062] In actual use, after the patient's hand is inserted into the restraint space 35, CT scans (such as top view, left, right view and front view of the patient's hand) are taken and imported into the navigation system. Through the combined tracer 4, the position of the instrument in the space is known, and then the positional relationship between the patient's scaphoid bone and the instrument in the space, as well as the spatial pose of the patient's scaphoid bone, are calculated. Then, in the subsequent operation, the tracer 4 is used to track the patient's scaphoid bone to achieve precise surgery.

[0063] refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 The rotating mechanism 5 is rotatably connected to the base 1. The rotating mechanism 5 can drive the placement plate 21 to rotate relative to the base 1 via the arc-shaped helical rack 221, causing the tracer 4 and the fixed support 3 to change their positions in space synchronously. It can also maintain the placement plate 21 in the rotated position, ensuring that the positions of the tracer 4 and the fixed support 3 remain unchanged in space. (Reference) Figure 3 Regarding the mirror image of the centerline along the length of the placement plate 21, there are two arc-shaped helical racks 221; one of the arc-shaped helical racks 221 interacts with the rotating mechanism 5, while the other arc-shaped helical rack 221 makes the placement plate 21 more stable when rotating.

[0064] In practice, the tracer 4 tracks the position of the scaphoid bone in space in real time. The surgeon determines the direction and angle of insertion of the guide needle into the scaphoid bone based on the fracture line. The rotation mechanism 5 drives the placement plate 21 to rotate, adjusting the patient's hand to the optimal surgical position so that the surgeon can insert the guide needle into the patient's scaphoid bone. After adjusting to the optimal surgical position, the rotation mechanism 5 also keeps the placement plate 21 in the rotated position, while the constraint space 35 constrains the patient's hand so that the position of the patient's hand relative to the tracer 4 does not change. Thus, the surgeon can always clearly know the position of the patient's scaphoid bone during the operation through the navigation system.

[0065] As will be understood by those skilled in the art, in orthopedic navigation surgery, the surgical instruments used are also equipped with tracers 4, such as instrument optical reference frames, to track the spatial position of the surgical instruments in real time during the operation, so as to clarify the operating path of the surgical instruments.

[0066] Specifically, the base 1 has a first clearance groove and a second clearance groove. The arc-shaped helical rack 221 is located in the first clearance groove, and the rotating mechanism 5 is located in the second clearance groove. With this arrangement, the overall height of the device can be reduced, making the device more compact. After placing the patient's hand in the restraint space 35, it can prevent the patient's arm from being raised. At the same time, the first clearance groove and the second clearance groove can also reduce the overall weight of the device and reduce material costs during processing.

[0067] refer to Figure 4 , Figure 5 and Figure 6 The rotating mechanism 5 includes: a rotating sleeve 53, a helical gear 54, a locking element 55, and a spring 56.

[0068] First, we will explain how to drive the placement plate 21 to adjust its angle; combined with Figure 1 and Figure 4 The rotating sleeve 53 is pivotally connected to the base 1. Specifically, a second connecting arm 51 is provided in the second clearance groove. The second connecting arm 51 extends in the thickness direction of the base 1. A second rotating shaft 52 is provided on one side of the second connecting arm 51. The rotating sleeve 53 is sleeved on the second rotating shaft 52 and can rotate relative to the second rotating shaft 52.

[0069] refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 The helical gear 54 is sleeved on the rotating sleeve 53 and meshes with the arc-shaped helical rack 221. When the helical gear 54 rotates, it can drive the arc-shaped helical rack 221 to rotate about the axis of the first rotating shaft 111, thereby causing the placement plate 21 to change its angle. In addition, the meshing of the helical gear 54 and the arc-shaped helical rack 221 can have higher structural strength and more stable operation.

[0070] refer to Figure 4 and Figure 7 The locking member 55 is sleeved on one end of the rotating sleeve 53 and can drive the rotating sleeve 53 to rotate axially. The locking member 55 can move between a locked position and a working position in the axial extension direction of the rotating sleeve 53. After the locking member 55 moves from the locked position to the working position, the locking member 55 can drive the helical gear 54 to rotate synchronously through the rotating sleeve 53, so as to drive the arc-shaped helical rack 221 to drive the placement plate 21 to rotate. When the locking member 55 is in the locked position, the locking member 55 can restrict the rotation of the helical gear 54, thereby keeping the placement plate 21 in the position after rotation.

[0071] In practical use, the surgeon or surgical assistant holds the locking member 55 and applies a pulling force to it, causing the locking member 55 to move linearly from the locked position to the working position. After the locking member 55 moves away from the locked position, it can rotate axially, driving the rotating sleeve 53 and the helical gear 54 to rotate synchronously. At this time, under the meshing of the helical gear 54 and the arc-shaped helical rack 221, the arc-shaped helical rack 221 also rotates synchronously, thereby changing the angle of the placement plate 21. During this process, the patient's hand and the tracer 4 move accordingly. The placement plate 21 rotates in real time. During this process, the tracer 4 corresponds with the navigation system in real time, enabling the navigation system to track the position of the scaphoid bone of the patient's hand and the status of the instrument. After adjusting the patient's hand to the ideal surgical position, the locking member 55 is reset to the locked state, so that the locking member 55, the rotating sleeve 53, the helical gear 54 and the arc-shaped helical rack 221 cannot rotate, thereby obtaining the final surgical position of the patient's hand to facilitate the surgical operation. At the same time, it avoids the placement plate 21 from changing its angle under force.

[0072] Combination Figure 2 , Figure 8 , Figure 9 , Figure 10 The explanation of how the locking element 55 restricts the helical gear 54 is provided, in conjunction with... Figure 2 , Figure 9 The long side wall of the base 1 is also provided with a locking rod 12.

[0073] refer to Figure 8 and Figure 9 In the length extension direction of the locking member 55, the locking member 55 includes a locking end 551, a connecting section 552 and an abutting end 553 connected in sequence. The locking end 551 is generally in the shape of a circular plate, and several positioning grooves are machined on the outer side of the locking end 551. In the locked position, the locking end 551 abuts against the end face of the helical gear 54, and one end of the locking rod 12 extends into a positioning groove, so that the locking member 55 cannot rotate axially, thereby restricting the placement plate 21.

[0074] In addition, combined Figure 4 , Figure 7 , Figure 9 The locking member 55 has an installation groove for the rotating sleeve 53 to extend into from the locking end 551 toward the abutting end 553. The inner wall of the installation groove has several first limiting grooves.

[0075] The helical gear 54 has a through hole, and the inner wall of the through hole is provided with several second limiting grooves.

[0076] The outer wall of the rotating sleeve 53 is provided with several limiting protrusions, which extend along the axial direction of the rotating sleeve 53. During assembly, the helical gear 54 is first installed on the rotating sleeve 53, at which time the portion of each limiting protrusion extends into the corresponding second limiting groove. Then, the rotating sleeve 53 is installed at one end, at which time the remaining portion of each limiting protrusion extends into the corresponding first limiting groove. Thus, when the locking member 55 rotates axially in the working position, the rotating sleeve 53, the helical gear 54, and the arc-shaped helical rack 221 rotate synchronously. At the same time, the setting of multiple limiting protrusions can also share the stress brought by the inner wall of the first limiting groove, thereby reducing the wear and tear of the device and extending its service life.

[0077] Specifically, the number of the first limiting groove, the second limiting groove, and the limiting protrusion is the same, specifically six. Of course, as those skilled in the art will understand, the number of the first limiting groove, the second limiting groove, and the limiting protrusion is not limited to the above number, and can be increased or decreased accordingly based on the diameter of the rotating sleeve 53.

[0078] refer to Figure 9 , Figure 10 The second rotating shaft 52 has an abutment plate 521 at one end away from the second connecting arm 51. A spring 56 is arranged around the second rotating shaft 52 and is located between the abutment plate 521 and the abutment end 553 of the locking member 55. One end of the spring 56 abuts against one side of the abutment plate 521, and the other end of the spring 56 abuts against the abutment end 553 of the locking member 55, thereby providing a thrust to the locking member 55 so that the locking member 55 is always in the locked position, that is, the locking end 551 of the locking member 55 is always in contact with the end face of the helical gear 54.

[0079] Specifically, the abutment plate 521 and the second rotating shaft 52 can be connected by screwing. In this configuration, the abutment plate 521 and the second rotating shaft 52 can be separated to facilitate the assembly of the rotating sleeve 53, the helical gear 54 and the locking member 55.

[0080] refer to Figure 5 , Figure 6 as well as Figure 9 , Figure 10When a pulling force is applied to the locking member 55, the locking member 55 moves from the locked position to the working position along the axial direction of the rotating sleeve 53. At this time, the locking end 551 moves away from the helical gear 54, and the abutting end 553 gradually presses the spring 56. Simultaneously, the locking rod 12 gradually disengages from the positioning groove until the locking member 55 can rotate. Correspondingly, when the pulling force on the locking member 55 is stopped, the spring 56 opens, and along the axial direction of the rotating sleeve 53, the spring 56 pushes the locking member 55 back to the locked position, thereby restricting the locking member 55. In this configuration, the locking member 55 is always in a locked state, thus keeping the spatial orientation of the placement plate 21, the tracer 4, and the fixing bracket 3 unchanged, thereby preventing changes in the angle of the placement plate 21 after being subjected to force during the operation. At the same time, the pushing force provided by the spring 56 can also prevent the locking member 55 from shifting due to accidental contact, thus keeping the patient's hand in the ideal surgical position throughout the entire operation.

[0081] refer to Figure 11 , Figure 12 and Figure 13 To restrain the patient's hand, in this embodiment, the fixation brace 3 includes: a brace body 31 and three pouches; the restraint space 35 of the brace body 31 is formed inside the brace body 31. The brace body 31 has an insertion port 311 and two extension ports 312 that communicate with the restraint space 35. In use, the patient's hand is inserted into the restraint space 35 with the palm facing upward. The patient's index finger, middle finger, ring finger and little finger extend out through the larger extension port 312, and the patient's thumb extends out through the smaller extension port 312. The patient's thumb and palm are at approximately 90° to each other. In this state, the patient's palm can be spread out to the maximum extent corresponding to the scaphoid bone.

[0082] An operating port 313 connecting the constraint space 35 is also provided on the upper surface of the main body 31 of the brace. When in use, the position of the patient's hand corresponding to the scaphoid bone is exposed in the operating port 313 so that the surgeon can perform corresponding surgical operations on the scaphoid bone.

[0083] Combination Figure 1 and Figure 11 —13, the main body 31 of the brace can be divided into a palm part and a wrist part, and the lower surface of the palm part is parallel to the placement end face 211. The wrist part is curved in shape. After the patient puts his hand into the restraint space 35, the curved wrist part will raise the patient's wrist position towards the operation port 313, thereby allowing at least part of the patient's scaphoid bone position to extend out of the operation port 313, so as to fully expose the position of the patient's hand corresponding to the scaphoid bone.

[0084] refer to Figure 13The sac includes a first sac 32, a second sac 33, and a third sac 34. The first sac 32 is located on the upper surface of the constraint space 35, and the second sac 33 and the third sac 34 are located on the lower surface of the constraint space 35. In the height extension direction of the brace body 31, the second sac 33 and the first sac 32 are opposite to each other. In the length extension direction of the brace body 31, the second sac 33 and the third sac 34 are arranged at intervals on the lower surface of the constraint space 35. The first sac 32 corresponds to the patient's palm, the second sac 33 corresponds to the back of the patient's hand, and the third sac 34 corresponds to the patient's wrist.

[0085] Furthermore, the first capsule 32, the second capsule 33, and the third capsule 34 can expand within the constraint space 35 to occupy the area of ​​the constraint space 35, thereby shrinking the constraint space 35. At the same time, during the expansion process, the first capsule 32, the second capsule 33, and the third capsule 34 compress the corresponding position of the patient's hand, thereby restricting the patient's hand within the constraint space 35. This ensures that the patient's hand will not change position due to surgical operations (such as the insertion of the guide needle) during the operation. In other words, the position of the scaphoid bone in the space will not change relative to the tracer 4, which is beneficial for real-time tracking of the scaphoid bone position through the tracer 4 under the navigation system.

[0086] Furthermore, the expansion of the third capsule 34 makes the position of the patient's hand corresponding to the scaphoid bone fit more closely with the operating port 313, which is more conducive to the surgeon performing the corresponding surgical operations.

[0087] As will be understood by those skilled in the art, the first bladder 32, the second bladder 33, and the third bladder 34 are either water bladders or air bladders, with air bladders being preferred.

[0088] refer to Figure 12 and Figure 13 The upper surface of the support body 31 is also provided with a connection interface 36. The connection interface 36 is connected to the pipelines of the first bladder 32, the second bladder 33 and the third bladder 34. The connection interface 36 is an inflation interface and is equipped with a one-way valve inside. The one-way valve allows gas to be injected into the first bladder 32, the second bladder 33 and the third bladder 34 from the outside, so that the first bladder 32, the second bladder 33 and the third bladder 34 are always in an expanded state after inflation. In actual use, gas can be injected into the first bladder 32, the second bladder 33 and the third bladder 34 by connecting an inflatable balloon or an air pump to the connection interface 36.

[0089] Specifically, the brace body 31 is made of a rigid material that does not affect CT imaging, such as rigid plastic. When the first bladder 32, the second bladder 33 and the third bladder 34 are expanded, the brace body 31 will not deform, thus providing better restraint for the patient's hand and making it easier for the navigation system to determine the positional relationship between the tracer 4 and the brace body 31.

[0090] More specifically, the support body 31 and the placement end face 211 are configured to be detachably connected, such as... Figure 1 , Figure 13 As shown, two connecting columns are provided on the lower surface of the support body 31. The two connecting columns can be integrally connected with the support body 31. A threaded channel is provided from the end of the connecting column away from the support body 31 toward the support body 31. Two through holes are provided on the connecting end face 212 of the placement plate 21 toward the placement end face 211. A bolt is screwed into the threaded channel after passing through the through holes, so that the support body 31 is fixed to the placement end face 211 of the placement plate 21.

[0091] refer to Figure 1 —2 and Figure 14 The tracer 4 includes a connecting rod 41, a first connector 42, a second connector 43, and a frame 44. The connecting rod 41 has a first end and a second end, wherein the first end is fixedly connected to the placement end face 211, and the second end of the connecting rod 41 extends away from the placement end face 211 in the thickness direction of the placement end face 211.

[0092] Specifically, a threaded hole is made from the first end to the second end, and a corresponding through hole is made from the connecting end face 212 to the placement end face 211. A bolt is screwed into the threaded hole after passing through the through hole, thereby fixing the connecting rod 41 to the placement end face 211. As will be understood by those skilled in the art, the position of the connecting rod 41 on the placement end face 211 should avoid the surgical area to prevent interference with the surgical operation, while also providing sufficient surgical space for the surgeon to avoid interfering with the surgeon's limb movements.

[0093] refer to Figure 1 —2 and Figure 14 The first connector 42 is fixed to the second end of the connecting rod 41. For example, the first connector 42 and the second end of the connecting rod 41 can be connected by a thread, or the first connector 42 can be fixed to the second end of the connecting rod 41 using fasteners such as bolts. The outer wall of the first connector 42 is provided with a first joint portion.

[0094] The second connector 43 is used to connect the frame 44 to the first connector 42. Specifically, one end of the second connector 43 can be connected to the frame 44 by a thread or by fasteners such as bolts.

[0095] The second connector 43 has a second joint at the end away from the frame 44. The second joint is bolted to the first joint. Specifically, the second joint has a through hole, and the first joint has a corresponding threaded hole. A bolt passes through the through hole and is screwed into the corresponding threaded hole of the first joint until the head of the bolt abuts against the outer surface of the second joint, thus forming a connection between the first joint and the second joint. Specifically, the axis of the through hole is perpendicular to the axis of the connecting rod 41.

[0096] As will be understood by those skilled in the art, when the bolt is not tightened, the second connector 43 and the frame 44 can rotate relative to the connecting rod 41, that is, the frame 44 can be adjusted in an angle in a direction perpendicular to the axis of the connecting rod 41 so that the frame 44 will not obstruct the surgical area, and at the same time, the frame 44 can better correspond with the surgical navigation system to track the real-time status of the instrument.

[0097] refer to Figure 14 Four tracer balls 441 are installed on the side of the frame 44 facing away from the second connector 43, that is, on the upper surface of the frame 44. The tracer balls 441 can be infrared optical balls that can reflect or emit infrared light, preferably infrared optical balls that reflect infrared light. Of course, other types of tracer balls can also be used, such as balls that can emit wireless signals. The specific type depends on the type of surgical navigation system.

[0098] It should be understood that although this specification describes various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0099] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of this application and are not intended to limit the scope of protection of this application. All equivalent implementations or modifications made without departing from the spirit of the art of this application, such as combinations, divisions or repetitions of features, should be included within the scope of protection of this application.

Claims

1. A hand fixation instrument for scaphoid navigation surgery, characterized in that, It includes, Base; A placement platform, comprising a placement plate and a transmission unit, wherein the placement plate has a placement end face and a connection end face, and the transmission unit is disposed on the connection end face and is rotatably connected to the base; A fixed support is provided on the placement end face, wherein the fixed support forms a constrained space; A tracer is disposed on the placement end face; A rotating mechanism is rotatably connected to the base, wherein the rotating mechanism can drive the placement plate to rotate relative to the base through the transmission part, so that the position of the tracer and the fixed support in space changes synchronously, and can also keep the placement plate in the position after rotation, so that the position of the tracer and the fixed support in space remains unchanged. The transmission unit includes: An arc-shaped helical toothed rack, which is pivotally connected to the base; The rotating mechanism includes: A rotating sleeve is pivotally connected to the base. A helical gear, wherein the helical gear is sleeved on the rotating sleeve and meshes with the arc-shaped helical rack; A locking element is sleeved on one end of the rotating sleeve. The locking element is movable between a locked position and a working position in the axial extension direction of the rotating sleeve. After the locking element moves from the locked position to the working position, the locking element can drive the helical gear to rotate synchronously through the rotating sleeve, thereby driving the arc-shaped helical rack to rotate the placement plate. When the locking element is in the locked position, the locking element can restrict the rotation of the helical gear.

2. The hand fixation instrument for scaphoid navigation surgery as described in claim 1, characterized in that, The base also includes: a locking rod; In the length extension direction of the locking member, the locking member includes a locking end, a connecting section and an abutting end connected in sequence, wherein the outer side of the locking end is provided with a plurality of positioning grooves, and in the locked position, one end of the locking rod extends into one of the positioning grooves.

3. The hand fixation instrument for scaphoid navigation surgery as described in claim 2, characterized in that, The rotating mechanism further includes: A spring, wherein the spring abuts against the abutting end and provides a thrust to the locking member so that the locking member is always in the locked position, and when the locking member moves from the locked position to the working position, the locking rod disengages from the positioning groove, and the abutting end presses the spring.

4. The hand fixation instrument for scaphoid navigation surgery as described in claim 1, characterized in that, The fixed support includes: The brace body has a constraint space formed inside it, and the brace body has an inlet and an outlet communicating with the constraint space. An operating port communicating with the constraint space is also provided on the upper surface of the brace body. A plurality of capsules are disposed within the constrained space, wherein the plurality of capsules are capable of expanding within the constrained space to contract the constrained space.

5. The hand fixation instrument for scaphoid navigation surgery as described in claim 4, characterized in that, The capsule includes: The first capsule located on the upper surface of the constrained space; A second bladder and a third bladder are located on the lower surface of the constraint space, wherein the second bladder and the first bladder are opposite each other in the height extension direction of the brace body; In the length extension direction of the brace body, the second bladder and the third bladder are arranged at intervals on the lower surface of the constraint space; The upper surface of the main body of the brace is also provided with a connection interface, which is connected to the pipelines of the first bladder, the second bladder, and the third bladder.

6. The hand fixation instrument for scaphoid navigation surgery as described in claim 5, characterized in that, The first bladder, the second bladder, and the third bladder are air bladders.

7. The hand fixation instrument for scaphoid navigation surgery as described in claim 4, characterized in that, The main body of the support is detachably connected to the placement end face.

8. The hand fixation instrument for scaphoid navigation surgery as described in claim 1, characterized in that, The tracer includes a connecting rod, one end of which is connected to the placement end face, and the other end of which extends away from the placement end face in the thickness direction of the placement end face. A frame is connected to the end of the connecting rod away from the placement end face, wherein several tracer balls are installed on the side of the frame facing away from the connecting rod.

9. The hand fixation instrument for scaphoid navigation surgery as described in claim 8, characterized in that, The frame is capable of rotating relative to the connecting rod in a direction perpendicular to the axis of the connecting rod.

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