A kit for navigation reduction of long bone fractures

Abstract

The invention provides a kit for navigation reduction of long bone fractures, which relates to the field of medical navigation technology and comprises: two reduction components, each of which is provided with a reference frame with an NDI ball, comprising a reduction pin for fixing the broken bone so that the reduction pin and the broken bone can move synchronously; a positioning plate and an anti-rotation pin, wherein the positioning plate is provided on the reduction pin, and the anti-rotation pin is provided on the positioning plate, and is used to assist the reduction pin in being fixed in the broken bone to prevent the reduction pin and the broken bone from rotating relative to each other; an operating handle is provided on the outside of the reduction pin, and after the operating handle is combined, the position of the operating handle and the reduction pin remains unchanged, thereby playing a driving role; a reference frame is provided with an NDI ball, and after the reference frame is provided, the position of the reference frame and the reduction pin does not change; the kit further comprises a navigation shooting instrument and a display device, wherein the reference frame on the reduction component is tracked by the navigation shooting instrument, and image changes of the broken bone are displayed in real time according to changes of the reference frame tracked by the navigation shooting instrument.

Description

Technical Field

[0001] The invention relates to the technical field of medical navigation, and in particular to a kit for navigation reduction of long bone fractures. Background Art

[0002] There are five types of bones in the human body: long bones, short bones, flat bones, irregular bones, and sesamoid bones. Long bones are one of them. Long bones support the weight of daily loads and allow the body to move normally. The femur and tibia play the most important roles. There are epiphyses at both ends of growing long bones. The ends of the epiphyses are covered by hyaline cartilage, which is also called articular cartilage. When stimulated by growth hormone secreted by the anterior pituitary gland, the epiphyseal plates of long bones undergo endochondral ossification, thereby growing longitudinally.

[0003] The long bones include the femur, tibia, and fibula of the lower limb; the humerus, radius, and ulna of the arm; the metacarpals of the hand and metatarsal bones of the foot; the phalanges of the fingers and toes; and the clavicle. The long bones of the human leg account for about half of an adult's height.

[0004] A fracture is a medical condition in which the continuity of a bone is partially or completely broken. In severe cases, the bone may break into several pieces. A fracture can be caused by a strong impact or pressure; in certain medical conditions that weaken the bones (such as osteoporosis, osteopenia, bone cancer, osteogenesis imperfecta), a fracture can also be caused by minor trauma, which is called a pathological fracture.

[0005] Long bone fractures can be caused by trauma or bone disease, with the former being the most common in clinical practice. When long bones are injured, their physiological functions may be affected, resulting in symptoms such as pain, swelling, abnormal movement, and abnormal gait.

[0006] After a fracture, the broken bones at both ends need to be repositioned. Clinically, the repositioning results are divided into anatomical repositioning and functional repositioning. Anatomical repositioning means that after repositioning, the normal anatomical morphology is completely restored, that is, the broken bones at both ends fit "perfectly", which is the most ideal repositioning result. However, ideals are often full, while reality is very skinny. Sometimes, despite the doctor's best efforts, the broken ends of the fracture still cannot "fit perfectly". Summary of the invention

[0007] In clinical reduction operations, the fractures at both ends are reduced by the doctor's experience and technical level, but there is no guarantee that the fractures at both ends can be "perfectly" aligned each time, which greatly affects the effect of fracture reduction.

[0008] In order to solve this problem, the present invention provides a kit for navigation reduction of long bone fractures, which specifically includes:

[0009] A reduction assembly is provided with a reference frame, including a reduction pin for driving the broken bone to move, and a positioning plate is sleeved on the outer side of the reduction pin, and the reduction pin is divided into two parts, an operating part and an insertion part, by the positioning plate; the reference frame is fixedly connected to the operating part or the positioning plate of the reduction pin;

[0010] The positioning plate is also provided with an anti-rotation pin whose center line is not on the same longitudinal axis as the center line of the reduction pin; the insertion portion of the reduction pin and the anti-rotation pin are inserted into the long bone at the same time;

[0011] A navigation tracking system, a navigation photographing device for tracking the real-time position of the reference frame, and a display device;

[0012] When the reduction pin drives the broken bone to move, the reference frame simultaneously generates a displacement path, and the position signal of the reference frame is captured by the navigation photographing device, and the position signal is input to the display device;

[0013] The display device stores the broken long bone image registered with the reference frame, and displays the change of the broken long bone image in real time through the position signal of the reference frame.

[0014] Furthermore, the reduction nail has an insertion portion and an operating portion, which are respectively located at two ends of the reduction nail. The insertion portion is used to be inserted into the broken bone, and an operating handle is provided on the outside of the operating portion.

[0015] Furthermore, the insertion portion includes a depth-limiting section having a depth-limiting thread, an outer diameter of the depth-limiting section being smaller than an outer diameter of the insertion portion, and a length of the depth-limiting section being less than one centimeter. When in use, the depth-limiting section is inserted into the broken bone, the depth-limiting thread facilitates the reduction nail to be screwed into the broken bone, and the length of the depth-limiting section is limited, thereby limiting the depth of the depth-limiting section being driven into the broken bone, so as to prevent complications caused by the reduction nail being driven too deeply into the broken bone.

[0016] Furthermore, the positioning plate has a reset through hole and an anti-rotation through hole, the central axis of the reset through hole and the anti-rotation through hole are not on the same longitudinal axis, the reset pin passes through the positioning plate through the reset through hole, the positioning plate is fixed on the reset pin, and the anti-rotation pin passes through the positioning plate through the anti-rotation through hole. When in use, the depth-limiting section of the reset pin is inserted into the broken bone, the positioning plate is fixed on the reset pin, and then the anti-rotation pin is passed through the anti-rotation through hole. Since the centers of the reset through hole and the anti-rotation through hole are not on the same straight line, the reset pin and the anti-rotation pin are inserted into different positions of the broken bone, and the broken bone is positioned at multiple points. The anti-rotation pin is inserted into the broken bone so that the reset pin does not rotate in the bone.

[0017] Furthermore, the reset nail further includes a limiting portion for limiting the position of the positioning plate on the reset nail, the limiting portion is located between the operating portion and the insertion portion, and the operating portion, the limiting portion and the insertion portion are continuous and uninterrupted. When in use, the operating portion of the reset nail passes through the reset through hole of the positioning plate, and the positioning plate moves toward the direction where the depth limit section is located, moves to the limiting portion, is blocked by the limiting portion, and thus limits the position of the positioning plate.

[0018] Further, the positioning plate is a plate having a shape of a long axis and a short axis. When in use, the long axis of the positioning plate is parallel to the long axis of the long bone, so as to find a suitable anti-rotation through hole to drive the anti-rotation nail.

[0019] Furthermore, the reset through hole is a polygonal hole, and the operating part of the reset pin is a polygonal columnar structure, which passes through the polygonal hole. The reset pin and the reset through hole are not rotated relative to each other, ensuring that the reset pin and the positioning plate move synchronously without relative rotation.

[0020] Furthermore, the anti-rotation through holes are evenly distributed with the reset through hole as the center.

[0021] Furthermore, the anti-rotation through holes are evenly distributed toward both ends along the long axis with the reset through hole as the center.

[0022] Furthermore, the anti-rotation through holes are evenly distributed layer by layer toward both ends along the long axis with the reset through hole as the center.

[0023] Furthermore, a plurality of the anti-rotation through holes are provided.

[0024] Furthermore, the operating handle and the reset nail are detachably connected. When in use, the operating handle and the reset nail are assembled so that the operating handle and the reset nail are combined into a whole that can move synchronously.

[0025] Furthermore, the operating handle includes a fastening screw, the operating portion of the reset pin has a threaded channel matching the fastening screw, and the fastening screw is threadedly connected to the threaded channel. When in use, the fastening screw is screwed into the threaded channel, so that the operating handle and the reset pin are combined into a whole that can move synchronously.

[0026] Furthermore, the positioning plate includes a limiting structure, the limiting structure is connected to a side of the positioning plate facing the operating portion, and the operating handle abuts against the limiting structure.

[0027] Furthermore, the limiting structure is a clamping strip, which is evenly distributed around the reset through hole, and the operating handle abuts against the clamping strip.

[0028] Furthermore, the operating handle includes a chuck having a groove matching the clamping strip, and the groove engages the clamping strip. The chuck of the operating handle engages the clamping strip of the positioning plate, so that the operating handle and the positioning plate do not rotate relative to each other, so that the two can move in unison.

[0029] Furthermore, the navigation structure includes a reference frame, and the reference frame is detachably connected to the operating handle, or the reference frame is detachably connected to the positioning plate.

[0030] Furthermore, the reference frame is arranged on a setting rod extending from an operating handle, and the reference frame is an angle-adjustable reference frame; this setting can ensure that the reference frame is set at an optimal angle, which is convenient for tracking and shooting by the navigated shooting device.

[0031] Beneficial Effects

[0032] 1. The position of the reduction pin is determined by tracking the position change of the reference frame, thereby determining the position of the broken bone. During the operation, the movement of the reduction pin will drive the movement of the broken bone, and the opposite movement of the broken bones at both ends will achieve the reduction of the broken bones. The positioning structure prevents the reduction pin from rotating in the bone to prevent the reduction pin from rotating without moving due to force during operation. The operating handle is the power source for the movement of the reduction pin, and the navigation structure calibrates the position of the reduction pin in real time. The operator can know the current position, direction, distance and angle of the reduction pin in real time, so as to achieve the purpose of accurate reduction and alignment of the broken bones at both ends.

[0033] 2. The anti-rotation screw prevents the reduction screw from rotating in the bone to prevent the reduction screw from self-rotating instead of moving when the reduction screw is moved, thus ensuring the effective movement of the broken bone.

[0034] 3. The reset through hole of the positioning plate is a polygonal hole. The positioning plate is sleeved on the operating part of the reset nail. The operating part is a polygonal column. In this way, there is no relative rotation between the positioning plate and the operating part. When the reset nail moves, the positioning plate moves synchronously. There is a limit between the operating handle and the positioning plate, so that there is no relative rotation between the operating handle and the positioning plate. When the operating handle moves, the reset nail, the positioning plate, and the anti-rotation nail move, thereby driving the broken bone to move.

[0035] 4. The long bone fracture navigation reduction component of the present invention has a simple installation method and a simple assembly structure. There is no adapter in the entire device. The operator can move and adjust it at will and operate it according to the situation of the fracture end. It has high flexibility and can better reduce the fracture end. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0037] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0038] In the attached picture:

[0039] Figure 1 A flowchart of the various structures of a reset kit of the present invention;

[0040] Figure 2 It is a schematic diagram of the combined structure of a resetting pin, a positioning plate and an anti-rotation pin of the present invention;

[0041] Figure 3 It is a schematic diagram of the structure of the engagement between the chuck and the clamping strip of the positioning plate of the present invention;

[0042] Figure 4 It is a schematic diagram of the assembly of a reduction pin of the present invention;

[0043] Figure 5 It is a structural schematic diagram of a positioning plate of the present invention;

[0044] Figure 6 It is a cross-sectional schematic diagram of a reduction nail of the present invention;

[0045] Figure 7 It is a schematic diagram of the three-dimensional structure of an operating handle of the present invention;

[0046] Figure 8 The figure is an assembly diagram of a reference frame of the present invention.

[0047] List of main reference symbols

[0048] 1. Reset pin; 11. Operation part; 12. Position limiting part; 13. Insertion part; 14. Threaded cavity; 15. Depth limiting section;

[0049] 2. Anti-rotation nails;

[0050] 3. Positioning plate; 31. Reset through hole; 32. Anti-rotation through hole; 33. Card strip;

[0051] 4. Operating handle; 41. Housing; 42. Sleeve; 43. Chuck; 44. Fastening screw; 45. Handle;

[0052] 5. Reference frame; 51. Connecting rod. DETAILED DESCRIPTION

[0053] In order to make the purpose, scheme and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of specific embodiments of the present invention.

[0054] Example: Please refer to Figures 1 to 8 :

[0055] The present invention provides a kit for navigation reduction of long bone fractures, comprising:

[0056] A reduction assembly is provided with a reference frame 5, including a reduction nail 1 for driving the broken bone to move, and a positioning plate 3 is sleeved on the outer side of the reduction nail 1, and the reduction nail 1 is divided into two parts, an operating part 11 and an insertion part 13, respectively; the reference frame 5 is fixedly connected to the operating part or the positioning plate 3 of the reduction nail 1;

[0057] The positioning plate 3 is also provided with an anti-rotation pin 2 whose center line is not on the same longitudinal axis as the center line of the reduction pin 1; the insertion portion of the reduction pin 1 and the anti-rotation pin 2 are inserted into the long bone at the same time;

[0058] A navigation tracking system, a navigation photographing device for tracking the real-time position of the reference frame 5, and a display device;

[0059] When the reduction nail 1 drives the broken bone to move, the reference frame 5 simultaneously generates a displacement path, and the position signal of the reference frame 5 is captured by the navigation camera, and the position signal is input to the display device;

[0060] The display device stores the broken long bone image registered with the reference frame 5 , and displays the change of the broken long bone image in real time through the position signal of the reference frame 5 .

[0061] The reduction pin 1 in the present invention is fixed on the broken bone, and the reduction pin 1 is relatively fixed to the broken bone. During operation, the movement of the reduction pin 1 will drive the movement of the broken bone, and the broken bones at both ends move towards each other to achieve the reduction of the broken bones. The positioning structure prevents the reduction pin 1 from rotating in the bone to prevent the reduction pin from rotating without moving under force during operation. The operating handle 4 is the power source for the movement of the reduction pin 1. The reference frame 5 on the reduction component is tracked by a navigation and shooting device to know the position of the reduction pin 1 in real time, and the position change of the broken bone can be known through conversion, and the reduction status of the broken bone can be displayed in real time through a display device; through the above-mentioned kit setting, the position, moving direction, moving distance and angle of the reduction pin can be known, and the reduction process of the broken bone image can be displayed on the display device through conversion; thereby achieving the purpose of accurate reduction and alignment of the broken bones at both ends.

[0062] Among them, two groups of reduction pins 1 are respectively inserted into two broken bones of the fractured long bone, wherein the reduction pin 1 serves as a fixed reference, and the anti-rotation pin 2 limits the freedom of the reduction pin 1 so that it will not rotate relative to the broken bone along the axis. After the positions of the reduction pin 1 and the anti-rotation pin 2 in the bone are determined, one of the broken bones is kept stationary, and the reference frame 5 on this broken bone is captured and identified by the navigation shooting device, and determined as the reference for the reduction of the broken bone. The reduction pin 1 and the anti-rotation pin 2 pull the other broken bone to approach the broken bone serving as the reference, and through the reference frame 5 of the other broken bone, the positional relationship between the two broken bones is determined in real time to ensure the accuracy of the reduction path. The reduction paths of the two are determined by the bone reduction simulation before reduction, specifically: when the three-dimensional bone at one end is stationary, the reduction path of the three-dimensional bone at the other end is reduced by adjusting the angle and distance as the reduction planning path; or when the three-dimensional bones at both ends are reduced by adjusting the angle and distance respectively, the reduction path is the reduction planning path.

[0063] See also Figure 2 and Figure 6 In an embodiment of the present application, the reduction nail 1 includes an operating part 11, an insertion part 13 and a limiting part 12. The operating part 11 is used for operation by an operator, the insertion part 13 is used to be inserted into the broken bone, and the limiting part 12 is used to limit the position of the positioning plate 3. Specifically, the operating part 11 is located at an end close to the operating end, the insertion part 13 is located at an end away from the operating end, and the limiting part 12 is located between the operating part 11 and the insertion part 13. The operating part 11, the insertion part 13 and the limiting part 12 are continuous and uninterrupted. More specifically, the operating part 11 is a polygonal columnar structure, and the reduction through hole 31 of the positioning plate 3 is a polygonal hole. The reduction through hole 31 allows the operating part 11 of the reduction nail to pass through. The design of the polygonal columnar structure and the polygonal hole can prevent relative rotation between the positioning plate 3 and the reduction nail. When in use, align the reset through hole 31 of the positioning plate 3 with the operating end of the operating part 11, and drive the positioning plate 3 to move in a direction away from the operating end. During the movement, the positioning plate 3 is blocked by the limiting part 12, and the position of the positioning plate 3 is limited by the limiting part 12.

[0064] The insertion portion 13 is a cylindrical structure. During the process of the insertion portion 13 being driven into the bone, the surrounding tissue will not be scratched because it has no edges or corners. The end of the insertion portion 13 away from the operating end, that is, the end inserted into the broken bone during use, has a depth-limiting section 15, and the length of the depth-limiting section 15 is L, L≦1.0cm. During use, the end of the reduction nail 1 having the depth-limiting section 15 is driven into the broken bone. This embodiment limits the length of the depth-limiting section 15, thereby limiting the depth of the reduction nail 1 driven into the broken bone, so as to prevent the reduction nail 1 from being driven too deeply into the broken bone, causing complications or affecting subsequent intramedullary nail treatment, because the intramedullary nail is placed in the bone marrow cavity, and if the reduction nail 1 is driven too deeply, it will enter the bone marrow cavity, resulting in the occupation of the position of the intramedullary nail, which will affect the implantation of the intramedullary nail and related treatment operations.

[0065] The limiting portion 12 is a boss having an outer diameter greater than that of the operating portion 11. The boss is a columnar structure or a plate-like structure. The boss is used to support the positioning plate 3 so that the positioning plate 3 is positioned on the reset pin 1. In some embodiments, the limiting portion 12 is a stepped structure with a gradually decreasing outer diameter. The portion of the limiting portion 12 close to the operating end of the reset pin 1 has a larger outer diameter, and the portion of the limiting portion 12 away from the operating end of the reset pin 1 has a smaller outer diameter. The outer diameter of the limiting portion 12 has a transition from large to small, so that the bearing capacity of the limiting portion 12 is stronger and is sufficient to bear the force applied by the operator during operation.

[0066] The positioning structure includes a positioning plate 3 and an anti-rotation pin 2. The positioning plate 3 has a reset through hole 31 and an anti-rotation through hole 32. The central axes of the reset through hole 31 and the anti-rotation through hole 32 are not on the same longitudinal axis. The reset pin 1 passes through the positioning plate 3 through the reset through hole 31. The positioning plate 3 is fixed on the reset pin 1. The anti-rotation pin 2 passes through the positioning plate 3 through the anti-rotation through hole 32. When in use, the depth-limiting section 15 of the reset pin 1 is inserted into the broken bone, the positioning plate 3 is fixed on the reset pin 1, and then the anti-rotation pin 2 passes through the anti-rotation through hole 32. Since the central axes of the reset through hole 31 and the anti-rotation through hole 32 are not on the same longitudinal axis, the reset pin 1 and the anti-rotation pin 2 are inserted into different positions of the broken bone, and the broken bone is positioned at multiple points. The anti-rotation pin 2 is inserted into the broken bone so that the reset pin 1 will not rotate in the bone. Furthermore, a depth limiting cap is provided on the anti-rotation pin 2. After the anti-rotation pin 2 is set to the anti-rotation through hole 32, the tip of the anti-rotation pin 2 is flush with the tip of the reduction pin 1. This arrangement ensures that there is no need to pay special attention to the setting depth of the anti-rotation pin 2 after the reduction pin 1 is set, and ensures that the intramedullary nail is not affected when entering the bone cavity. Specifically, a plurality of anti-rotation through holes 32 are provided on the positioning plate 3.

[0067] See also Figure 2 In this embodiment, both the reduction pin 1 and the anti-rotation pin 2 are inserted into the broken bone. When in use, the anti-rotation pin 2 is inserted into the broken bone through the anti-rotation through hole 32. When the operator applies force to the reduction pin 1, the reduction pin 1 can be driven to move instead of rotating. The movement of the reduction pin 1 can drive the broken bone to move and be reduced. Since the positioning plate 3 is fixed on the reduction pin 1, the positioning plate 3 and the reduction pin 1 can move synchronously without relative rotation. The operating handle 4 is detachably connected to the operating end of the reduction pin 1. When in use, the operating handle 4 is connected to the reduction pin 1, so that the operating handle 4 and the reduction pin 1 can move synchronously, and the operating handle 4 abuts against the positioning plate 3, so that there is no relative rotation between the reduction pin 1 and the positioning plate 3, and there is no relative rotation between the operating handle 4 and the positioning plate 3, thereby ensuring the synchronous movement of the operating handle 4, the reduction pin 1, and the positioning plate 3.

[0068] In an embodiment of the present application, the operating end of the reduction nail 1 has a threaded cavity 14 with an opening at one end, and the opening of the threaded cavity 14 faces the direction away from the positioning plate 3. The operating handle 4 includes a fastening screw 44, which is screwed into the threaded cavity 14. The fastening screw 44 is threadedly connected to the reduction nail 1 through the threaded cavity 14, so that the reduction nail 1 and the operating handle 4 are combined and connected to form a whole that can move synchronously. During assembly, the fastening screw 44 is screwed into the threaded cavity 14, and the fastening screw 44 is tightened to connect the operating handle 4 to the reduction nail 1. When the operator holds the operating handle 45 and moves it, the reduction nail 1 moves synchronously, thereby driving the broken bone to move and achieve the reduction of the broken bone. In some embodiments, the fastening screw 44 has a handle 45, and the handle 45 facilitates the operator to turn the fastening screw 44. Specifically, the handle 45 is a butterfly handle 45, and the butterfly handle 45 is more labor-saving when tightening the fastening screw 44.

[0069] See also Figure 4 and Figure 6 In the embodiment of the present application, the positioning plate 3 is a plate having both a long axis and a short axis. Specifically, the positioning plate 3 is a rectangular plate or an elliptical plate, or the edge of the positioning plate 3 is arc-shaped. A plurality of anti-rotation through holes 32 are provided on the positioning plate 3 and are provided on the edge of the positioning plate 3. The anti-rotation through holes 32 are distributed in a circular array with the center of the reset through hole 31 as the center of the circle; so that the central axis of the anti-rotation through hole 32 and the reset through hole 31 are not on the same longitudinal axis, so that the reset pin 1 and the anti-rotation pin 2 are inserted into the broken bone for multi-point positioning, thereby preventing the reset pin 1 from rotating. More specifically, the positioning plate 3 is an integrated structure in which fan-shaped plates are combined at both ends of a rectangular plate, and the short sides on both sides of the rectangular plate have fan-shaped plates. The fan-shaped plates are integrally formed with the rectangular plate. This integrated structure is strong as a whole and can withstand the force received during operation without breaking. The center of the reset through hole 31 is located at the midpoint of the long axis of the positioning plate 3, and the anti-rotation through hole 32 is distributed on the positioning plate 3 with the reset through hole 31 as the center. Specifically, the reset through hole 31 is located in the center of the rectangular plate, and the anti-rotation through hole 32 is distributed along the arc of the fan-shaped block, and the anti-rotation through holes 32 are set on the fan-shaped blocks on both sides. When in use, the long axis of the positioning plate 3 is parallel to the long axis of the long bone, so as to find the position of the reduction nail 1 and the anti-rotation nail 2 to be driven into the bone. The reduction nail 1 is first driven into the target position of the broken bone, and then the reduction through hole 31 of the positioning plate 3 is aligned with the operation point of the reduction nail 1. The positioning plate 3 moves along the reduction nail 1 in the direction away from the operation end. The positioning plate 3 is blocked by the limiting part 12 and is positioned on the reduction nail 1. The anti-rotation through hole 32 at a suitable position is found, and then the anti-rotation nail 2 is passed through the anti-rotation through hole 32 so that the anti-rotation nail 2 is driven into the broken bone. One end of the anti-rotation nail 2 is driven into the broken bone, and the other end is blocked by the side of the positioning plate 3 facing the operation end. The positioning plate 3 constrains the position of the anti-rotation nail 2. In actual operation, at least one anti-rotation nail 2 is inserted into the broken bone. For patients with loose fractures, more anti-rotation nails 2 need to be driven. The anti-rotation nail 2 in this embodiment is a Kirschner wire or a Steinmann wire or a bone screw.

[0070] In other embodiments of the present application, the anti-rotation through holes 32 are centered on the reset through hole 31 and are evenly distributed from the center to both ends along the long axis of the positioning plate 3. Specifically, the center of the reset through hole 31 is located at the midpoint of the long axis, and the anti-rotation through holes 32 are arranged outwardly layer by layer with the reset through hole 31 as the center, and the number of anti-rotation through holes 32 in each layer is the same or increases layer by layer. When in use, select the anti-rotation through hole 32 with a suitable distance and position, and insert the anti-rotation nail 2 through the anti-rotation through hole 32 into the broken bone.

[0071] See also Figure 4 and Figure 5 In the embodiment of the present application, the positioning plate 3 includes a limiting structure, which is used to limit the position of the operating handle 4. The limiting structure is arranged on the side of the positioning plate 3 facing the operating end, and the limiting structure is connected to the positioning plate 3. Specifically, the limiting structure is a clamping strip 33, which is integrally connected or fixedly connected to the positioning plate 3, and the clamping strip 33 is evenly distributed around the reset through hole 31. Preferably, the clamping strip 33 is a semi-cylindrical structure, and the cross-sectional area of ​​the clamping strip 33 is semi-circular. The clamping strip 33 is symmetrically distributed along the long axis of the positioning plate 3, or the clamping strip 33 is symmetrically distributed along the short axis of the positioning plate 3, and the arched surface of the clamping strip 33 faces the operating end to facilitate the abutment of the operating handle 4.

[0072] See also Figure 3 , Figure 6 and Figure 7 In an embodiment of the present application, the operating handle 4 includes a chuck 43 abutting against the card strip 33, the chuck 43 has a groove matching the card strip 33, and the groove engages the card strip 33. Specifically, the chuck 43 is a disc-shaped structure, and the groove opening of the chuck 43 faces the card strip 33. The groove of the chuck 43 is buckled on the card strip 33 so that the groove engages the card strip 33, and then the fastening screw 44 of the operating handle 4 is screwed into the threaded cavity 14 of the reduction nail 1, so that the operating handle 4 is relatively fixed to the reduction nail 1, and at the same time, the chuck 43 of the operating handle 4 is tightly pressed against the card strip 33 of the positioning plate 3, thereby realizing the fixation among the operating handle 4, the reduction nail 1, and the positioning plate 3, and no relative rotation occurs among the three, so that the purpose of moving the broken bone can be achieved through the operating handle 4.

[0073] In other embodiments of the present application, the clamping strip 33 is arranged in a circle along the edge of the reset through hole 31 with the reset through hole 31 as the center (not shown in the figure), and the clamping strip 33 forms a toothed surface on the side of the positioning plate 3 facing the operating end, and the grooves of the chuck 43 are arranged in a circle, and the shape and size of the grooves match the clamping strip 33, and the grooves engage the clamping strip 33, so that the operating handle 4 engages with the positioning plate 3.

[0074] See also Figure 7 and Figure 8Specifically, the operating handle 4 includes a sleeve 42, which is connected to the side of the chuck 43 facing the operating end. The sleeve 42 has a first opening close to the operating end and a second opening facing the directional plate. The operating end of the reset nail 1 enters the interior of the sleeve 42 from the second opening, and the operating end of the reset nail 1 is located between the first opening and the second opening. The fastening screw 44 enters the threaded cavity 14 of the reset nail 1 from the first opening. The fastening screw 44 is tightened to connect the reset nail 1 to the fastening screw 44, and the operating handle 4 is pressed against the positioning plate 3.

[0075] In other embodiments of the present application, the inner diameter of the sleeve 42 is a polygon, the tube hole of the sleeve 42 is a polygonal hole, the inner diameter of the sleeve 42 matches the operating part 11 of the reduction nail 1, the sleeve 42 is sleeved outside the operating part 11 of the reduction nail 1, the operating part 11 of the reduction nail 1 is a polygonal columnar structure, the sleeve 42 is a polygonal hole, and no relative rotation occurs between the sleeve 42 and the operating part 11 of the reduction nail 1.

[0076] The operating handle 4 also includes a shell 41, which is sleeved outside the sleeve 42. The shell 41 is connected to the sleeve 42. The outer diameter of the shell 41 gradually decreases from the middle to both ends, which is convenient for the operator to hold. The good operating feel during use is conducive to the operator to accurately move the broken bone.

[0077] See also Figure 1 In an embodiment of the present application, the navigation structure includes a reference frame 5, which is detachably connected to an operating handle 4. Specifically, the operating handle 4 includes a connecting rod 51, which is detachably connected to the reference frame 5, and the connecting rod 51 is a cylindrical rod.

[0078] The positions of the reduction pins 1 and the anti-rotation pins 2 can be calibrated in real time through the reference frame 5. The operator can see the current positions, moving distances, angles, and directions of the reduction pins 1 and the anti-rotation pins 2 through the display to ensure accurate reduction of the broken bones.

[0079] A more preferred embodiment is that the reference frame 5 is set on the setting rod extending from the operating handle 4, and the reference frame 5 is an angle-adjustable reference frame 5. This setting can ensure that the reference frame 5 is set at the best angle, which is convenient for the navigation shooting device to track and shoot. At least three NDI balls are set on the reference frame 5, and any three DI balls are not on the same straight line.

[0080] The method of using the navigation kit of the present invention is as follows:

[0081] 1. Assembly of the reset assembly: install the positioning plate 3 to the position of the limit portion 12 of the reset pin 1, then fix the operating handle 4 to the outside of the reset pin 1, and then fix the reference frame 5 to the positioning plate 3 or the operating handle 4 to complete the assembly of the reset assembly;

[0082] 2. Calibration of the tip of the reset pin 1 and the reference frame 5, using a calibration instrument to complete the calibration of the tip of the reset pin 1 and the reference frame 5;

[0083] 3. Rotate the reduction assembly and adjust the angle of the reduction assembly so that the long axis of the positioning plate 3 coincides or nearly coincides with the axis of the patient's broken bone, ensuring that there is an anti-rotation through hole 32 facing the broken bone. After finding the correct angle, implant the insertion parts 13 of the two reduction assemblies into the two sides of the patient's bone fracture respectively;

[0084] 4. The anti-rotation nail 2 is passed through the anti-rotation through hole 32 and through the positioning plate 3 and then implanted into the patient's broken bone, thereby completing the installation of the positioning structure;

[0085] 5. Hold the operating handle 4 and control the movement of the operating handle 4 to drive the reduction pin 1 to reduce the broken bone. During the process, the navigation and photographing device tracks the position changes on the reference frame 5 to understand the changes in the tip of the reduction pin 1 and thus the changes in the broken bone. At the same time, an image showing the changes in the broken bone is displayed on the display device.

[0086] 6. By observing the fractured bone condition displayed on the display device, it can be known whether the fractured bone has been reduced. When the fractured bone is shown on the display device as reduced, the actual fractured bone is reduced successfully, and then subsequent operations can be performed.

[0087] Example 2

[0088] Procedure for femoral shaft fracture surgery using the long bone fracture navigation reduction kit.

[0089] The first step is to adjust the patient's position: place the patient supinely on the operating table;

[0090] The second step is to align the coordinate system, using the alignment device in the alignment device for aligning the coordinates of the navigation device with the image position coordinates of patent technology 202301010101895.4 to complete the coordinate system alignment of the navigation device and the imaging device;

[0091] The third step is to determine the length and diameter of the intramedullary nail: a measuring ruler is placed in front of the femur. The measuring ruler is used to measure the diameter and length of the patient's femoral shaft. The proximal end is placed at the intramedullary nail insertion point and the distal end is located at the expected position. The length of the intramedullary nail is directly read and the diameter is predicted based on the reading on the measuring ruler.

[0092] The fourth step is to prepare the intramedullary nail insertion hole. Under the guidance of the navigation system, the guide instrument is used to find the accurate guide position and angle and fix the guide instrument. Under the guidance of the guide instrument, the medullary cavity is expanded to prepare the intramedullary nail insertion hole. After the medullary expansion is completed, the intramedullary nail is inserted after the reduction.

[0093] Step 5: Reset the broken bones. Hold the operating handle 4 of the resetting assembly and control the resetting nail 1 to reset the two broken bones through the operating handle 4. After resetting, maintain the resetting state.

[0094] The sixth step is the placement and locking of the intramedullary nail. The intramedullary nail is placed into the medullary cavity under the reduction and maintenance state, and the position of the intramedullary nail is locked using the locking hole.

[0095] Part 7: Suturing the wound.

[0096] An embodiment of the present invention provides another method for implementing the fifth step of broken bone reduction. The kit also includes a driving unit, which is connected to the reduction component or the patient's legs on both sides of the broken bone. Based on the intraoperative long bone broken bone image, the reduction component or the patient's legs on both sides of the broken bone are driven to adjust the angle and distance of the two long bone broken bones to achieve reduction, and the position is reduced after reduction.

[0097] In another embodiment, reduction is achieved by adjusting the angle and distance of two broken long bones based on a reduction path. The reduction path is a preoperatively planned path. The planned path is obtained by performing reduction simulation on a three-dimensional model of the fractured long bone. The planned path includes long bone angle parameters and long bone displacement parameters. The three-dimensional model of the fractured long bone is obtained by three-dimensional reconstruction based on the patient's fracture imaging data. Reducing the fracture through the reduction path can reduce the error of intraoperative reduction and improve the accuracy of intraoperative reduction.

[0098] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A kit for navigation reduction of long bone fractures, characterized in that: include: A reduction assembly is provided with a reference frame (5), comprising a reduction nail (1) for driving the broken bone to move, a positioning plate (3) is sleeved on the outer side of the reduction nail (1), and the reduction nail (1) is divided into two upper and lower parts by the positioning plate (3), namely an operating part (11) and an insertion part (13); the reference frame (5) is fixedly connected to the operating part or the positioning plate (3) of the reduction nail (1); The positioning plate (3) is also provided with an anti-rotation pin (2) whose center line is not on the same longitudinal axis as the center line of the reduction pin (1); the insertion portion of the reduction pin (1) and the anti-rotation pin (2) are inserted into the long bone at the same time; the positioning plate (3) has a reduction through hole (31) and an anti-rotation through hole (32); the insertion portion (13) includes a depth limiting section (15); the depth limiting section (15) has a depth limiting thread; the outer diameter of the depth limiting section (15) is smaller than the outer diameter of the insertion portion (13); the length of the depth limiting section (15) is less than one centimeter; after the anti-rotation pin is set in the anti-rotation through hole, the tip of the anti-rotation pin is flush with the tip of the reduction pin; the reduction pin (1) also includes a limiting section (12) for limiting the position of the positioning plate (3) on the reduction pin (1); the limiting section (12) is located between the operating section (11) and the insertion section (13); the operating section (11), the limiting section (12) and the insertion section (13) are continuous and uninterrupted; An operating handle (4) is installed outside the operating portion (11); the operating handle (4) includes a fastening screw (44); the operating portion (11) has a threaded channel matching the fastening screw (44); the fastening screw (44) is threadedly connected to the threaded channel; the operating portion (11) is a polygonal columnar structure; the reset through hole (31) of the positioning plate (3) is a polygonal hole; the reset through hole (31) allows the operating portion (11) of the reset nail to pass through; The positioning plate (3) comprises a limiting structure, the limiting structure is connected to a side of the positioning plate (3) facing the operating portion (11), and the operating handle (4) abuts against the limiting structure; the limiting structure is a clamping strip (33); the operating handle (4) comprises a chuck (43), the chuck (43) has a groove matching the clamping strip (33), and the groove engages the clamping strip (33); A navigation and tracking system, comprising a navigation photographing device and a display device for tracking the real-time position of the reference frame (5); When the reduction nail (1) drives the broken bone to move, the reference frame (5) is synchronously caused to generate a displacement path, and the position signal of the reference frame (5) is captured by a navigation photographing device, and the position signal is input into a display device; The display device stores a long bone fracture image registered with the reference frame (5), and displays the position change of the long bone fracture image in real time through the position signal of the reference frame (5).

2. A navigation reduction kit for long bone fractures according to claim 1, characterized in that: The central axes of the reset through hole (31) and the anti-rotation through hole (32) are not on the same longitudinal axis; the reset pin (1) is passed through the reset through hole (31) and is arranged in the positioning plate (3); the positioning plate (3) is fixed on the reset pin (1); and the anti-rotation pin (2) passes through the positioning plate (3) through the anti-rotation through hole (32).

3. The long bone fracture navigation reduction kit according to claim 1, characterized in that: The positioning plate (3) is a plate having a shape of a long axis and a short axis at the same time, the edge of the positioning plate (3) is arc-shaped, and a plurality of anti-rotation through holes (32) are provided on the positioning plate (3) and are arranged on the edge of the positioning plate (3).

4. The long bone fracture navigation reduction kit according to claim 1, characterized in that: The reference frame (5) is arranged on a setting rod extending from the operating handle (4), and the angle of the reference frame (5) is adjustable.

5. A navigation reduction kit for long bone fractures according to claim 4, characterized in that: At least three NDI balls are arranged on the reference frame (5), and any three NDI balls are not on the same straight line.

6. The navigation reduction kit for long bone fracture according to claim 1, characterized in that: The kit also includes a driving unit, which is connected to the resetting component and drives the resetting component based on the intraoperative long bone fracture image to drive the two long bone fractures to adjust the angle and distance.

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