Hand fixing instrument for scaphoid navigation surgery

Abstract

The invention relates to the field of navigation surgery instruments, in particular to a hand fixing instrument for scaphoid bone navigation surgery. The placing platform comprises a placing plate and a transmission part, the placing plate is provided with a placing end face and a connecting end face, the transmission part is arranged on the connecting end face, and the transmission part is rotationally connected with the base; the fixing brace is arranged on the placing end face, and a constraint space is formed in the fixing brace; the tracer is arranged on the placing end face; 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 poses of the tracer and the fixing support in the space are synchronously changed, the placing plate can be kept at the rotated position, and the poses of the tracer and the fixing support in the space are kept unchanged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of navigation surgery instruments, in particular to a hand fixing instrument for scaphoid navigation surgery. BACKGROUND

[0002] At present, the treatment of scaphoid fracture mainly includes conservative treatment and surgical treatment, wherein the surgical treatment includes closed reduction percutaneous Kirschner wire internal fixation, open reduction Kirschner wire internal fixation, closed reduction percutaneous cannulated screw internal fixation, and open reduction cannulated screw internal fixation.

[0003] With the development of orthopedic navigation surgery technology, the technology has been more and more applied to various orthopedic surgeries. In navigation surgery, a tracer used in cooperation with a navigation system is needed to track the position of the surgery area in real time, so as to accurately, minimally invasively and effectively reduce and fix the fracture.

[0004] During the scaphoid navigation surgery, the patient's palm is required to face upwards, and a flexible object is laid under the wrist to make the patient's wrist part protrude, so that the position of the patient's hand corresponding to the scaphoid is fully stretched out. The tracer is installed on the patient's scaphoid through a 1.5mm fixing needle or guide needle as a medium. In this way, the length and elasticity of the fixing needle or guide needle will always exist swing, which will cause the spatial pose of the tracer obtained by the navigation system to always change. At the same time, the patient's hand lacks constraint, which will also cause displacement during the surgery, so that the position of the patient's scaphoid in space is difficult to determine, which is not conducive to the operation. SUMMARY

[0005] In view of the above problems, the present application discloses a hand fixing instrument for scaphoid navigation surgery, which can adjust the patient's hand to the best operation position according to the direction and needle insertion angle of the operation guide needle inserted into the scaphoid during navigation surgery, and can also constrain the patient's hand to always determine the position of the patient's scaphoid in space during the operation.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme, which comprises:

[0007] a base;

[0008] a placement platform, the placement platform comprises a placement plate and a transmission part, the placement plate has a placement end face and a connection end face, wherein the transmission part is arranged on the connection end face, and the transmission part is rotationally connected with the base;

[0009] a fixing brace arranged on the placement end face, wherein the fixing brace forms a constraint space;

[0010] a tracer arranged on the placement end face;

[0011] A rotating mechanism is pivotally connected with the base, wherein the rotating mechanism is capable of driving the placement plate to rotate relative to the base through the transmission part, so that the pose of the tracer and the fixation brace in space changes synchronously, and the rotating mechanism is also capable of keeping the placement plate at the position after rotation, so that the pose of the tracer and the fixation brace in space remains unchanged.

[0012] In an illustrative embodiment of the hand fixation device for scaphoid navigation surgery, the transmission part comprises:

[0013] An arc-shaped helical rack is pivotally connected with the base;

[0014] The rotating mechanism comprises:

[0015] A rotating sleeve is pivotally connected with the base;

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

[0017] A locking member is sleeved on one end of the rotating sleeve, wherein the locking member is movable between a locking position and a working position in the axial extension direction of the rotating sleeve, and after the locking member moves from the locking position to the working position, the locking member is capable of driving the helical gear to rotate synchronously through the rotating sleeve, so as to drive the arc-shaped helical rack to rotate, and when the locking member is located at the locking position, the locking member is capable of limiting the helical gear from rotating.

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

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

[0020] In an illustrative embodiment of the hand fixation device for scaphoid navigation surgery, the rotating mechanism further comprises a spring, wherein the spring abuts against the abutting end and provides a pushing force for the locking member, so that the locking member is always located at the locking position, when the locking member moves from the locking position to the working position, the locking rod is released from the positioning groove, and the abutting end compresses the spring.

[0021] In an illustrative embodiment of the hand fixation device for scaphoid navigation surgery, the fixation brace comprises:

[0022] a brace body, the constraint space is formed inside the brace body, and the brace body has an extension inlet and an extension outlet which communicate with the constraint space, wherein an operation opening which communicates with the constraint space is further formed on the upper surface of the brace body; and

[0023] a plurality of capsules arranged in the constraint space, wherein the plurality of capsules can be inflated in the constraint space to shrink the constraint space.

[0024] In an illustrative embodiment of the hand fixation device for scaphoid navigation surgery, the capsule comprises:

[0025] a first capsule located on the upper surface of the constraint space;

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

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

[0028] wherein the upper surface of the brace body is further provided with a connection interface which communicates with the pipeline of the first capsule, the second capsule and the third capsule.

[0029] In an illustrative embodiment of the hand fixation device for scaphoid navigation surgery, the first capsule, the second capsule and the third capsule are air bags.

[0030] In an illustrative embodiment of the hand fixation device for scaphoid navigation surgery, the brace body and the placement end face are detachably connected.

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

[0032] a frame body connected to the end of the connecting rod away from the placement end face, wherein a plurality of tracer balls are installed on the side of the frame body away from the connecting rod.

[0033] In an illustrative embodiment of the hand fixation device for scaphoid navigation surgery, the frame body can rotate relative to the connecting rod in a direction perpendicular to the axis of the connecting rod.

[0034] The above features, technical characteristics, advantages of the hand fixing device for scaphoid navigation surgery and the implementation manners thereof will be further described in the following with the preferred embodiments in a clear and understandable manner in combination with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0035] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for purposes of illustration only and are not intended to limit the present application thereto. Like reference numerals are used to indicate like parts throughout the specification. In the drawings:

[0036] Figure 1 Structure diagram illustrating an exemplary embodiment of the hand fixing device for scaphoid navigation surgery.

[0037] Figure 2 Structure diagram illustrating the placement plate.

[0038] Figure 3 Structure diagram illustrating the rotating part.

[0039] Figure 4 Structure diagram illustrating the rotating mechanism.

[0040] Figure 5 Structure diagram illustrating the engagement between the arc-shaped helical rack and the helical gear.

[0041] Figure 6 Structure diagram illustrating the placement plate in the inclined state.

[0042] Figure 7 Sectional view diagram illustrating the rotating mechanism.

[0043] Figure 8 Structure diagram illustrating the locking member.

[0044] Figure 9 Structure diagram illustrating the locking member in the locking position.

[0045] Figure 10 Structure diagram illustrating the locking member in the working position.

[0046] Figure 11 Structure diagram illustrating the brace body.

[0047] Figure 12 Structure diagram illustrating the extension inlet and the extension outlet of the brace body.

[0048] Figure 13 Structure diagram illustrating the constraint space, the first bladder, the second bladder and the third bladder.

[0049] Figure 14 Schematic diagram of 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, extension inlet; 312, extension outlet; 313, operation port; 32, first capsule; 33, second capsule; 34, third capsule; 35, constraint space; 36, connecting interface; 4, tracer; 41, connecting rod; 42, first connecting piece; 43, second connecting piece; 44, frame body; 441, tracer ball; 5, rotating mechanism; 51, second connecting arm; 52, second rotating shaft; 521, abutting plate; 53, rotating sleeve; 54, helical gear; 55, locking piece; 551, locking end; 552, connecting section; 553, abutting end; 56, spring. DETAILED DESCRIPTION

[0052] In order to have a clearer understanding of the technical features, objectives and effects of the present application, the specific embodiments of the present application will be described below with reference to the drawings, wherein the same reference numerals represent the same or similar parts having the same function.

[0053] In this document, "schematic" means "serves as an example, instance or illustration", and any illustration or embodiment described as "schematic" in this document should not be interpreted as a more preferred or more advantageous technical solution.

[0054] In order to make the drawings simple, only the parts related to the present application are schematically shown in the drawings, which do not represent the actual structure of the product. In addition, in order to make the drawings simple and easy to understand, in some drawings, only one of the parts having the same structure or function is schematically shown, or only one of them is labeled.

[0055] Reference Figure 1 , Figure 2 The hand fixation instrument for scaphoid navigation surgery includes a base 1, a placement platform 2, a fixed support 3, a tracer 4 and a rotating mechanism 5, as shown in Figure 2 , 3 The base 1 has two connecting arms opposite to each other, both of which extend in the thickness direction of the base 1, wherein the first connecting arms 11 are provided with first rotating shafts 111 on the side away from each other, and the two first rotating shafts 111 are located at the end of the first connecting arms 11 away from the base 1.

[0056] The placing platform 2 comprises a placing plate 21 and a rotating part 22, the placing plate 21 has a placing end face 211 and a connecting end face 212, as shown in Figure 1 , the placing end face 211 is the face away from the base 1, and the fixing support 3 and the tracer 4 are installed on the placing end face 211.

[0057] The rotating part 22 is arranged on the connecting end face 212, and the rotating part 22 is rotationally connected with the first rotating shaft 111 of the two connecting arms, as shown in Figure 2 , the rotating part 22 comprises an arc-shaped helical rack 221 (1 / 2 helical gear), and the two ends of the arc-shaped helical rack 221 are fixedly connected with the connecting end face 212 of the placing plate 21, so that the placing plate 21 is driven to synchronously rotate when the arc-shaped helical rack 221 rotates.

[0058] As shown in Figure 3 , the inner side of the arc-shaped helical rack 221 is provided with a support frame 222, and the support frame 222 is provided with a connecting hole in the width direction of the placing plate 21, and the first rotating shaft 111 is inserted into the connecting hole, so that the placing plate 21 is driven to synchronously rotate when the arc-shaped helical rack 221 rotates around the axis of the connecting hole, thereby changing the spatial pose of the fixing support 3 and the tracer 4, and in use, the operator selects the direction of the guide needle according to the position of the scaphoid fracture line of the patient, and then drives the placing plate 21 to rotate, so as to adjust the hand of the patient to the ideal position, so as to facilitate CT shooting and guide needle insertion.

[0059] As shown in Figure 1 , the fixing support 3 forms a constraint space 35 capable of constraining the posture of the hand of the patient, and in use, the hand of the patient is inserted into the constraint space 35, and the hand of the patient is limited by the constraint space 35, so as to avoid the displacement of the hand of the patient relative to the placing plate 21 or the fixing support 3 during the operation, thereby determining the positional relationship between the scaphoid of the patient and the placing plate 21, so as to facilitate the acquisition of the position of the scaphoid of the patient under the navigation system.

[0060] As shown in Figure 1 , the tracer 4 is installed on the placing end face 211, and as can be understood by those skilled in the art, the position of the tracer 4 on the placing end face 211 should avoid the surgical area to avoid blocking the surgical area, and at the same time, enough surgical space should be left for the operator to avoid interfering with the movement of the operator's limbs.

[0061] The tracer 4 is mainly used for being recognized by the navigation system to calculate the position of the instrument in space, wherein the tracer 4 can be an optical reference frame, and as can be understood by those skilled in the art, before the scaphoid navigation operation, the three-dimensional model of the instrument is imported into the navigation system, and then when the navigation system tracks the instrument through the tracer 4, the real-time state of the instrument can be calculated.

[0062] In actual use, after the patient's hand is inserted into the constraint space 35, the patient's hand is photographed by CT (such as a top view, left view, right view and front view of the patient's hand), and is introduced into the navigation system. The position of the instrument in space is obtained through the tracer 4, and the spatial position of the patient's scaphoid bone is calculated based on the position of the instrument in space and the spatial position of the patient's scaphoid bone. The patient's scaphoid bone is tracked by the tracer 4 in the subsequent operation process to achieve precise surgery.

[0063] Reference Figure 3 , Figure 4 , Figure 5 and Figure 6 The rotating mechanism 5 is rotationally connected with the base 1. The rotating mechanism 5 can drive the placement plate 21 to rotate relative to the base 1 through the arc-shaped helical rack 221, so that the spatial position of the tracer 4 and the fixed brace 3 changes synchronously, and the placement plate 21 can be kept at the rotated position, so that the spatial position of the tracer 4 and the fixed brace 3 remains unchanged. Reference Figure 3 There are two arc-shaped helical racks 221 on the center line mirror image of the length direction of the placement plate 21. One arc-shaped helical rack 221 acts on the rotating mechanism 5, and the other arc-shaped helical rack 221 can make the placement plate 21 more stable during rotation.

[0064] In actual use, the position of the scaphoid bone in space is tracked in real time by the tracer 4. The surgeon determines the direction and angle of the needle when the needle is inserted into the scaphoid bone according to the position of the scaphoid bone fracture line. The placement plate 21 is driven to rotate by the rotating mechanism 5, so that the patient's hand is adjusted to the best surgical position, so that the surgeon can insert the needle into the patient's scaphoid bone. After being adjusted to the best surgical position, the rotating mechanism 5 also keeps the placement plate 21 at the rotated position, and 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. Therefore, the surgeon can always know the position of the patient's scaphoid bone during the operation through the navigation system.

[0065] As can be understood by those skilled in the art, in orthopedic navigation surgery, the surgical instrument also has a tracer 4, such as an instrument optical reference frame, which can track the spatial position of the surgical instrument in real time during the operation to determine the operation path of the surgical instrument.

[0066] As a specific, the base 1 is provided with a first avoiding slot and a second avoiding slot, the arc-shaped bevel gear rack 221 is located in the first avoiding slot, and the rotating mechanism 5 is located in the second avoiding slot. In this arrangement, the height of the device can be reduced, and the device is more compact. After the patient's hand is placed in the restraint space 35, the patient's arm can be prevented from being raised. In addition, the arrangement of the first avoiding slot and the second avoiding slot can reduce the weight of the device and reduce the material cost during processing.

[0067] Reference Figure 4 , Figure 5 and Figure 6 , the rotating mechanism 5 includes a rotating sleeve 53, a bevel gear 54, a locking piece 55 and a spring 56.

[0068] First, how to drive the placement plate 21 to adjust the angle is explained; combined with Figure 1 and Figure 4 , the rotating sleeve 53 is pivotally connected with the base 1. As a specific, a second connecting arm 51 is arranged in the second avoiding slot, the second connecting arm 51 extends in the thickness direction of the base 1, and the second connecting arm 51 is provided with a second rotating shaft 52. The rotating sleeve 53 is sleeved on the second rotating shaft 52 and can rotate relative to the second rotating shaft 52.

[0069] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , the bevel gear 54 is sleeved on the rotating sleeve 53, and the bevel gear 54 is engaged with the arc-shaped bevel gear rack 221. When the bevel gear 54 rotates, the arc-shaped bevel gear rack 221 can be driven to rotate around the axis of the first rotating shaft 111, thereby driving the placement plate 21 to change the angle. In addition, the bevel gear 54 is engaged with the arc-shaped bevel gear rack 221, which can have higher structural strength and be more stable during operation.

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

[0071] In the specific use, the operator or the surgical assistant holds the locking piece 55 and provides a pulling force to the locking piece 55, so that the locking piece 55 moves linearly from the locking position to the working position, after the locking piece 55 moves away from the locking position, the locking piece 55 can rotate axially and drive the synchronous rotation of the rotating sleeve 53, the bevel gear 54 and the arcuate bevel gear rack 221, at this time, the arcuate bevel gear rack 221 also synchronously rotates under the meshing of the bevel gear 54 and the arcuate bevel gear rack 221, thereby changing the angle of the placement plate 21, in this process, the hand of the patient and the tracer 4 rotate in real time with the placement plate 21, in this process, the tracer 4 corresponds to the navigation system in real time, so that the navigation system can track the position of the scaphoid bone of the hand of the patient and the state of the instrument in real time, after adjusting the hand of the patient to the ideal surgical position, the locking piece 55 is reset to the locking state again, so that the locking piece 55, the rotating sleeve 53, the bevel gear 54 and the arcuate bevel gear rack 221 cannot rotate, so as to obtain the final surgical posture of the hand of the patient, so as to facilitate the surgical operation, and at the same time, the secondary angle change of the placement plate 21 under the force is avoided.

[0072] In combination with Figure 2 , Figure 8 , Figure 9 , Figure 10 , the explanation of how to make the locking piece 55 realize the limitation to the bevel gear 54 is explained, in combination with Figure 2 , Figure 9 , the long side wall of the base 1 is also provided with a locking rod 12.

[0073] In combination with Figure 8 and Figure 9 , the locking piece 55 includes a locking end 551, a connecting section 552 and an abutting end 553 connected in sequence in the length extension direction of the locking piece 55, wherein the locking end 551 is a circular plate as a whole, and a plurality of positioning grooves are processed on the outer side of the locking end 551, under the locking position, the locking end 551 abuts against the end face of the bevel gear 54, and one end of the locking rod 12 extends into one positioning groove, so that the locking piece 55 cannot rotate axially, thereby limiting the placement plate 21.

[0074] In addition, in combination with Figure 4 , Figure 7 , Figure 9 , the locking piece 55 is provided with a mounting groove for the rotating sleeve 53 to extend into from the locking end 551 to the abutting end 553, wherein a plurality of first limiting grooves are opened on the inner wall of the mounting groove.

[0075] The bevel gear 54 has a through hole, and a plurality of second limiting grooves are opened on the inner wall of the through hole.

[0076] The outer wall of the rotating sleeve 53 is provided with a plurality of limiting protrusions extending in the axial direction of the rotating sleeve 53. During assembly, the helical gear 54 is first mounted on the rotating sleeve 53, at which time the limiting protrusions partially extend into the corresponding second limiting grooves; then the rotating sleeve 53 is mounted to one end of the rotating sleeve 53, at which time the limiting protrusions partially extend into the corresponding first limiting grooves. In this way, when the locking member 55 is axially rotated in the working position, synchronous rotation of the rotating sleeve 53, the helical gear 54, and the arc-shaped helical rack 221 is achieved. At the same time, the plurality of limiting protrusions can also share the stress from the inner wall of the first limiting groove, thereby reducing the wear and tear of the device and prolonging its service life.

[0077] Specifically, the number of first limiting grooves, second limiting grooves, and limiting protrusions is the same, specifically six. Of course, as can be understood by those skilled in the art, the number of first limiting grooves, second limiting grooves, and limiting protrusions is not limited to the above number, and can be increased or decreased accordingly according to the diameter of the rotating sleeve 53.

[0078] Reference Figure 9 , Figure 10 The second rotating shaft 52 is provided with an abutting plate 521 at the end away from the second connecting arm 51, and the spring 56 is arranged around the second rotating shaft 52 and located between the abutting plate 521 and the abutting end 553 of the locking member 55. One end of the spring 56 abuts one side of the abutting plate 521, and the other end of the spring 56 abuts the abutting end 553 of the locking member 55, thereby providing a pushing force for the locking member 55 so that the locking member 55 is always located in the locking position, i.e., the locking end 551 of the locking member 55 is always in abutment with the end face of the helical gear 54.

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

[0080] Reference Figure 5 , Figure 6 and Figure 9 , Figure 10When the pulling force is applied to the locking piece 55, the locking piece 55 moves from the locking position to the working position in the axis direction of the rotating sleeve 53, at this time, the locking end 551 is away from the bevel gear 54, and the abutting end 553 gradually presses the spring 56, at the same time, the locking rod 12 gradually comes out of the positioning groove, until the locking piece 55 can rotate, correspondingly, when the pulling force applied to the locking piece 55 is stopped, the spring 56 opens, and the spring 56 pushes the locking piece 55 back to the locking position in the axis direction of the rotating sleeve 53, so as to realize the limitation of the locking piece 55. In this arrangement, the locking piece 55 is always in the locked state, so that the space pose of the placement plate 21, the tracer 4 and the fixing support 3 is always kept unchanged, so as to avoid the change of the angle of the placement plate 21 after being stressed in the operation; at the same time, the pushing force provided by the spring 56 can also avoid the displacement of the locking piece 55 caused by accidental touch, so that the patient's hand maintains in the ideal operation position during the whole operation process.

[0081] Reference Figure 11 , Figure 12 and Figure 13 In order to realize the constraint of the patient's hand, in the embodiment, the fixing support 3 comprises: a support main body 31 and three capsules; the constraint space 35 is formed in the inside of the support main body 31, the support main body 31 has an extension inlet 311 and two extension outlets 312 which are in communication with the constraint space 35, in use, the patient's hand is in the posture of palm up, and is extended into the constraint space 35 through the extension inlet 311, wherein the patient's index finger, middle finger, ring finger and little finger are extended out of the extension outlet 312 with larger area, and the patient's thumb is extended out of the extension outlet 312 with smaller area, and the whole between the patient's thumb and palm presents approximately 90°, in this state, the patient's palm corresponding to the scaphoid position can be unfolded to the greatest extent.

[0082] An operation opening 313 in communication with the constraint space 35 is also formed on the upper surface of the support main body 31, in use, the position of the patient's hand corresponding to the scaphoid is exposed in the operation opening 313 for the surgeon to perform the corresponding operation on the scaphoid.

[0083] Combined with Figure 1 and Figure 11 -13, the support main body 31 can be specifically divided into a palm part and a wrist part, and the lower surface of the palm part is parallel to the placement end surface 211, and the wrist part presents a curve type, after the patient extends the hand into the constraint space 35, the curved wrist part will lift the position of the patient's wrist to the direction of the operation opening 313, so that the position of the patient's hand corresponding to the scaphoid is at least partially extended out of the operation opening 313, so as to completely expose the position of the patient's hand corresponding to the scaphoid.

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

[0085] And the first capsule 32, the second capsule 33 and the third capsule 34 can be inflated in the constraint space 35 to occupy the area of the constraint space 35, so as to shrink the constraint space 35, and in the inflation process, the inflated first capsule 32, the second capsule 33 and the third capsule 34 press the positions of the patient's hand, so as to limit the patient's hand in the constraint space 35, so that the position of the patient's hand does not change during the operation (such as needle insertion operation), that is, the position of the scaphoid bone in the space does not change relative to the tracer 4, which is beneficial to tracking the position of the scaphoid bone in real time through the tracer 4 under the navigation system.

[0086] And the inflation of the third capsule 34 makes the position of the patient's hand corresponding to the scaphoid bone more fit with the operation port 313, which is more beneficial to the corresponding operation of the operator.

[0087] As can be understood by those skilled in the art, the first capsule 32, the second capsule 33 and the third capsule 34 adopt one of a water bag or an air bag, and the air bag is preferred.

[0088] Reference Figure 12 And Figure 13 The upper surface of the brace body 31 is also provided with a connection interface 36, the connection interface 36 is in communication with the pipeline of the first capsule 32, the second capsule 33 and the third capsule 34, the connection interface 36 is an inflation interface, and a one-way valve is arranged in the connection interface 36, the one-way valve allows the gas from the outside to be filled into the first capsule 32, the second capsule 33 and the third capsule 34, so that the first capsule 32, the second capsule 33 and the third capsule 34 are always in an inflated state after inflation, and in specific use, an inflation balloon or an inflation pump can be connected to the connection interface 36 to fill gas into the first capsule 32, the second capsule 33 and the third capsule 34.

[0089] Specifically, the brace body 31 is made of a hard material that does not affect CT imaging, such as hard plastic. The brace body 31 made of such a material does not deform when the first bladder 32, the second bladder 33, and the third bladder 34 are inflated, thereby better restraining the patient's hand and facilitating the navigation system to determine the positional relationship between the tracer 4 and the brace body 31.

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

[0091] Referring to Figure 1 —2 and Figure 14 , the tracer 4 includes a connecting rod 41, a first connecting piece 42, a second connecting piece 43, and a frame body 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 formed in the first end towards the second end, and a corresponding through hole is formed in the connecting end face 212 towards 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 can be understood by those skilled in the art, the position of the connecting rod 41 on the placement end face 211 can avoid the surgical area, so as to avoid affecting the surgical operation, and also provide sufficient surgical space for the operator to avoid interfering with the operator's limb movement.

[0093] Referring to Figure 1 —2 and Figure 14 , the first connecting piece 42 is fixed to the second end of the connecting rod 41. For example, the first connecting piece 42 and the second end of the connecting rod 41 can be threadedly connected, or a fastener such as a bolt is used to fix the first connecting piece 42 to the second end of the connecting rod 41. The outer wall of the first connecting piece 42 is provided with a first engaging portion.

[0094] The second connecting piece 43 is used to connect the frame body 44 and the first connecting piece 42. Specifically, one end of the second connecting piece 43 and the frame body 44 can be threadedly connected, or a fastener such as a bolt is used for connection.

[0095] The second connecting piece 43 is provided with a second joint portion at one end away from the frame body 44, wherein the second joint portion and the first joint portion are connected by bolts, specifically, a hole is formed through the second joint portion, the first joint portion is provided with a corresponding threaded hole, the bolt passes through the hole and is screwed into the corresponding threaded hole of the first joint portion until the head of the bolt abuts against the outer surface of the second joint portion, so that the first joint portion and the second joint portion form a connection relationship; as a specific example, the axis of the hole is perpendicular to the axis of the connecting rod 41.

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

[0097] Reference Figure 14 The upper surface of the frame body 44 away from the second connecting piece 43 is provided with four tracking balls 441, wherein the tracking balls 441 can be infrared optical balls capable of reflecting or emitting infrared light, preferably infrared optical balls capable of reflecting infrared light, of course, other types of tracking balls can also be used, such as balls capable of emitting wireless signals, the specific type is based on the type of surgical navigation system.

[0098] It should be understood that although the present specification is described in terms of various embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be combined to form other embodiments that can be understood by those skilled in the art.

[0099] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present application, and are not intended to limit the protection scope of the present application, and equivalent embodiments or changes made without departing from the spirit of the present application, such as combination, division or repetition of features, should be included in the protection scope of the present application.

Claims

1. The hand fixation device used in scaphoid navigation surgery is characterized by: It includes, base; A placement platform, the placement platform comprising a placement plate and a transmission portion, the placement plate having a placement end surface and a connection end surface, wherein the transmission portion is provided on the connection end surface and is rotatably connected to the base; A fixing bracket is provided on the placement end surface, wherein the fixing bracket forms a restraining space; a tracer, disposed on the placement end surface; 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 positions of the tracer and the fixed support in space change synchronously, and can also keep the placement plate in the rotated position so that the positions of the tracer and the fixed support in space remain unchanged.

2. The hand fixation device for scaphoid navigation surgery according to claim 1, characterized in that: The transmission part includes: an arcuate helical rack, the arcuate helical rack being pivotally connected to the base; The rotating mechanism comprises: a rotating sleeve 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 piece, which is sleeved on one end of the rotating sleeve, wherein the locking piece can move between a locking position and a working position in the axial extension direction of the rotating sleeve. After the locking piece moves from the locking position to the working position, the locking piece can drive the helical gear to rotate synchronously through the rotating sleeve, so as to drive the arc-shaped helical rack to drive the placement plate to rotate. When the locking piece is in the locking position, the locking piece can limit the rotation of the helical gear.

3. The hand fixation device for scaphoid navigation surgery according to claim 2, characterized in that: The base further comprises: 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 a plurality of positioning grooves are provided on the outer side of the locking end, and in the locking position, one end of the locking rod extends into one of the positioning grooves.

4. The hand fixation device for scaphoid navigation surgery according to claim 3, characterized in that: The rotating mechanism further comprises: A spring, wherein the spring abuts the abutting end and provides a thrust for the locking member so that the locking member is always located in the locking position. When the locking member moves from the locking position to the working position, the locking rod disengages from the positioning groove and the abutting end presses the spring.

5. The hand fixation device for scaphoid navigation surgery according to claim 1, characterized in that: The fixing brace comprises: A brace body, wherein the restraint space is formed inside the brace body, and the brace body has an inlet and an outlet communicating with the restraint space, wherein an operation port communicating with the restraint space is further provided on the upper surface of the brace body; and A plurality of capsules are disposed in the confined space, wherein the capsules can expand in the confined space to shrink the confined space.

6. The hand fixation device for scaphoid navigation surgery according to claim 5, characterized in that: The capsule comprises: a first capsule located on the upper surface of the confined space; a second bladder and a third bladder located on the lower surface of the constrained space, wherein the second bladder and the first bladder are opposite to each other in the height extension direction of the brace body; In the longitudinal extension direction of the brace body, the second sac and the third sac are arranged at intervals on the lower surface of the restraint space; Wherein, a connection interface is further provided on the upper surface of the brace body, and the connection interface is connected with the first sac, the second sac and the third sac pipelines.

7. The hand fixation device for scaphoid navigation surgery according to claim 6, characterized in that: The first capsule, the second capsule, and the third capsule are air bags.

8. The hand fixation device for scaphoid navigation surgery according to claim 5, characterized in that: The support body is detachably connected to the placement end surface.

9. The hand fixation device for scaphoid navigation surgery according to claim 1, characterized in that: The tracer includes: a connecting rod, one end of which is connected to the placement end surface, and the other end of which extends in a direction away from the placement end surface in the thickness direction of the placement end surface; The frame is connected to the end of the connecting rod away from the placement end surface, wherein a plurality of tracer balls are installed on a side of the frame away from the connecting rod.

10. The hand fixation device for scaphoid navigation surgery according to claim 9, characterized in that: The frame body can rotate relative to the connecting rod in a direction perpendicular to the axis of the connecting rod.

Images