Reduction nail for long bone fracture reduction

Abstract

The utility model discloses a reduction nail for long bone fracture reduction, which comprises an operation holding part, a fixing part and a fixing part, the inserting part comprises an inserting rod section and a threaded tip section, the inserting part is connected with the center rod with the non-circular cross section, the threaded tip section is inserted into the broken bone, the holding part is operated to move to drive the broken bone to move, and resetting is completed. When in use, the threaded tip section of the insertion part is rotated into a broken bone of a long bone from the body surface, the holding part is held and operated by a hand to drive the position change of the whole reduction nail and drive the reduction of the broken bone connected with the holding part, and in addition, the reduction nail can further comprise an operating handle with a patient reference frame and an anti-rotation structure for preventing the reduction nail from rotating. And the resetting stability and the navigation tracking synchronism in the resetting process are ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical instruments, in particular to the technical field of surgical navigation instruments, and specifically is a reduction nail for reducing long bone fractures. Background Art

[0002] Currently, many surgeries are performed using navigation systems to ensure the accuracy of the surgical process. This is especially true for fracture surgeries of long bones such as the femur and humerus. Because the entry direction and angle of each instrument are extremely dependent on the doctor's experience, the surgery is difficult and prone to reduction deviations, resulting in poor patient recovery.

[0003] In the prior art, the patient reference frame fixed to the patient plays the role of assisting in tracking the patient's surgical position by being recognized by the navigation system and displayed in the imaging system. In the case of long bone fractures, because there are two broken bones, two corresponding patient reference frames are required to ensure accurate tracking. If the above method is still used, the patient reference frame will occupy space, affecting the operator's manual reduction operations.

[0004] How to find an effective way to complete the reduction operation in a space-saving manner is the key to solving the above problems. The utility model provides a reduction nail for reducing long bone fractures around the above problems. Utility Model Content

[0005] Currently in clinical practice, for patients with long bone fractures, the operator usually uses his or her hands to hold the patient's limbs to reduce the fracture site. However, this method will take up a lot of space in the long bone fracture surgical navigation system because the direct operation by the hand is easy to cause contact with the patient's reference frame, thereby affecting the tracking accuracy. Therefore, how to use a surgical instrument to quickly complete the surgical reduction during surgical navigation is a technical problem that needs to be solved. This technical solution uses a reduction nail that is inserted into the broken long bone, and the reduction nail is provided with an operating grip part and an inserting part. The insertion part is inserted into the broken bone, and the operation is performed through the operating grip part outside the body. The specific technical solution is:

[0006] A reduction nail for reducing long bone fractures, comprising:

[0007] an operating grip portion comprising a central rod having a non-circular cross-section;

[0008] The inserting part includes the inserting rod section and the thread tip section.

[0009] The insertion part is connected to the center rod with a non-circular cross section, the threaded tip section is inserted into the broken bone, and the operation of the gripping part drives the movement of the broken bone to complete the reduction.

[0010] When in use, the threaded tip of the insertion part is first rotated from the body surface into the broken bone of the long bone, and the holding part is operated by hand to drive the position change of the entire reduction nail and pull the broken bone connected thereto to be reduced.

[0011] Furthermore, the insertion rod section is a cylindrical rod, and the arrangement of the cylindrical rod facilitates the spike thread tip section to enter the skin during the insertion process, thereby reducing the risk of secondary tearing of the skin.

[0012] Furthermore, the cylindrical rod is a solid metal rod with a diameter ranging from 6 to 12 mm; such material and size can ensure the strength of penetrating into the bone and ensure that the structure will not be deformed during reduction.

[0013] Furthermore, the central rod and the inserted rod section are integrally connected and made of the same material. This arrangement can further enhance the resetting strength of the resetting nail.

[0014] Furthermore, the central rod is a square rod, and the diameter of the circle of the cross section of the inserted rod segment is the same as the diameter of the inscribed circle of the cross section of the central rod.

[0015] Furthermore, two reduction pins are provided, one for each broken bone. The provision of the two reduction pins allows the reduction operation to be completed simultaneously with both hands, thereby improving reduction efficiency.

[0016] Furthermore, a self-tapping groove is provided on the thread tip, which facilitates the insertion of the thread tip section of the insertion part.

[0017] Furthermore, the first end of the thread tip segment is a tip, and the opposite end is a second end, and a depth limiting structure is provided at the second end of the thread tip segment; the depth limiting structure includes a depth limiting plane having a diameter greater than the maximum diameter of the thread tip segment, or the depth limiting plane is formed by an inserted rod portion having a diameter larger than that of the thread tip segment.

[0018] Furthermore, the length of the thread tip section ranges from 0.8 to 1.2 cm, with the preferred length range being from 0.9 to 1.1 cm. This length setting can both avoid entering the bone cavity and ensure that the thread enters deeply enough.

[0019] Furthermore, the length of the center rod portion is 10-15 cm, and this distance setting can be convenient for hand holding and operation.

[0020] Furthermore, the length of the insertion portion is set to 10-15 cm.

[0021] Furthermore, an anti-rotation structure is sleeved on the reset pin, which is used to combine with the insertion part to prevent the reset pin from rotating; a corresponding limiting structure is provided between the center rod and the insertion part, which is used to limit the anti-rotation structure to the center rod and the limiting ring extending outward from the center rod or the insertion part, and the limiting structure includes a limiting plane, and the anti-rotation structure is limited on the limiting plane.

[0022] Furthermore, an operating handle is provided on the outside of the operating grip portion, and a patient reference frame is provided on the operating handle.

[0023] Beneficial effects of the utility model

[0024] 1) By configuring the reset pin to have a structure with an operating grip portion and an inserting portion, the reset operation can be transferred to the operating grip portion using the two portions, thereby reducing the space occupied by the reset operation.

[0025] 2) By setting a depth-limiting structure at the insertion part, it is possible to effectively prevent the thread tip from being inserted too deeply into the bone cavity.

[0026] 3) The difficulty of operation can be reduced by setting a special operating handle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the main structure of the reset nail of the utility model;

[0028] Figure 2 This is a side structural diagram of the depth and position limiting plane of the reset pin of the utility model;

[0029] Figure 3 This is a partially enlarged structural diagram of the limiting structure of the utility model;

[0030] Figure 4 This is a partial enlarged structural diagram of the center rod of the present invention;

[0031] Figure 5 Only a partial enlarged structural diagram of the present utility model is inserted;

[0032] Figure 6 This is a schematic diagram of the partially enlarged structure of the thread tip section of the utility model;

[0033] Figure 7 This is a schematic diagram of the structure of the reset pin with a patient reference frame and an anti-rotation structure provided on the operating grip portion of the utility model;

[0034] Figure 8 This is a schematic diagram of the anti-rotation structure of the symmetrically arranged plate-shaped structure of the utility model;

[0035] Figure 9 This is a schematic diagram of the anti-rotation nail structure of the utility model;

[0036] Figure 10 This is a schematic diagram of the structure of the lightweight sleeve part of the utility model;

[0037] Figure 11 This is a schematic diagram of the structure of the combined block provided on the hard pipe of the utility model;

[0038] Figure 12 This is a schematic diagram of the combined structure of the locking cap and the locking rod of the utility model;

[0039] Description of main reference numerals

[0040] 11. Insertion part; 111. Threaded tip section; 112. Insertion rod section; 113. Depth limit plane; 121. Center rod; 122. Operating handle; 1211. Hard tube; 1212. Blocking disk; 1213. Lightweight sleeve; 1214. Setting hole; 1215. Combination block; 1216. Rectangular surface; 123. Limiting structure; 1231. Limiting plane; 21. Locking threaded rod; 22. Locking cap; 23. Locking threaded hole; 3. Patient reference frame; 4. Anti-rotation structure; 41. Anti-rotation pin; 411. Depth limit cap; 42. Plate-shaped structure; 421. Pin hole; 51. Arc-shaped protrusion; 52. Arc-shaped recess; 61. Reference frame setting rod. DETAILED DESCRIPTION

[0041] refer to Figure 1-6 ; A reduction nail for reducing long bone fractures, which includes an operating gripping part, which includes a center rod 121 with a non-circular cross-section; an insertion part 11, which includes an insertion rod segment 112 and a threaded tip segment 111. The insertion part 11 is connected to the center rod 121 with a non-circular cross-section, and the threaded tip segment 111 is inserted into the broken bone. The movement of the operating gripping part drives the movement of the broken bone to complete the reduction.

[0042] When in use, the threaded tip section 111 of the insertion portion 11 is first rotated from the body surface into the broken bone of the long bone, and the holding portion is operated by hand to drive the position change of the entire reduction nail and pull the broken bone connected thereto to be reduced.

[0043] In a more preferred embodiment, the insertion rod section 112 is a cylindrical rod. The setting of the cylindrical rod facilitates the threaded tip section 111 to enter the skin during the insertion process, thereby reducing the risk of secondary tearing of the skin.

[0044] In a more preferred embodiment, the cylindrical rod is a solid metal rod with a diameter ranging from 6 to 12 mm; such material and size can ensure the strength of penetrating into the bone and ensure that the structure will not be deformed during reduction.

[0045] In a more preferred embodiment, the central rod 121 and the inserted rod segment 112 are integrally connected and made of the same material. This arrangement can further enhance the reduction strength of the reduction nail.

[0046] In a more preferred embodiment, the center rod 121 is a square rod, and the diameter of the circular cross section of the inserted rod segment 112 is the same as the diameter of the inscribed circle of the cross section of the center rod 121. This arrangement can ensure that the structure is stable after the two are combined.

[0047] A more preferred embodiment is to set two reduction pins, one on a broken bone. The setting of the two reduction pins can complete the reduction operation with both hands at the same time, thereby improving the reduction efficiency. Moreover, the operation of the hand is changed from horizontally holding the patient's skin to vertically holding the operation maintaining part by operating the gripping part, thereby reducing the reduction operation space required during reduction.

[0048] In a more preferred embodiment, a self-tapping groove is provided on the thread tip, which facilitates the insertion of the thread tip section 111 of the insertion part 11.

[0049] In a more preferred embodiment, the first end of the thread tip section 111 is a pointed end, and the opposite end is a second end. A depth-limiting structure is provided at the second end of the thread tip section 111. The depth-limiting structure includes a depth-limiting plane 113 having a diameter greater than the maximum diameter of the thread tip section 111. Alternatively, the depth-limiting plane 113 is formed by a portion of the insertion rod having a larger diameter than the thread tip section 111. The depth-limiting plane 113 is formed by the size difference between the insertion rod portion and the thread tip section 111. The provision of the depth-limiting plane 113 ensures that only the thread tip section 111 of the insertion rod enters the bone, while the rear end of the insertion rod does not. This effectively prevents the thread tip section 111 from being inserted too deeply, causing its tip to enter the bone cavity, which would affect the placement of the intramedullary nail.

[0050] A more preferred embodiment is that the length range of the thread tip section 111 is 0.8-1.2 cm, with the preferred length range being 0.9-1.1 cm; this length setting can not only meet the need to avoid entering the bone cavity, but also ensure that the entry is deep enough, providing effective anchoring force for completing the reduction of long bone fractures through the operating grip part connected to the insertion part 11.

[0051] A more preferred embodiment is that, in order to meet the hand gripping length requirement, the length of the center rod 121 is 10-15 cm. This distance setting can facilitate the hand gripping operation.

[0052] A more preferred embodiment is to guide the operating grip portion away from the skin through the insertion portion to avoid interference with the operating area during operation. The insertion portion is set to a length of 10-15 cm, which ensures that it can be inserted through the body surface while remaining a certain distance away from the skin, ensuring easy insertion of the anti-rotation nail.

[0053] A more preferred embodiment is to refer to Figure 7 A reference frame setting rod 61 extends from the outside of the operating grip, which is provided with an operating handle 122, and the patient reference frame 3 is mounted on the operating handle 122. This arrangement effectively combines the patient reference frame 3 with the operating grip, integrating navigation tracking with the reset operation, and reducing operational difficulty.

[0054] A more preferred embodiment is to refer to Figure 10-12 A thin rigid tube 1211 is disposed in the center of the operating handle 122. A lightweight sleeve 1213 with good friction is disposed outside the rigid tube 1211. Blocking discs 1212 are disposed at both ends of the rigid tube 1211 to prevent the rubber sleeve from sliding. One of the blocking discs 1212 is detachable, facilitating the installation of the lightweight sleeve 1213 and effectively reducing the overall size of the device. Furthermore, the detachable blocking disc 1212 facilitates removal to facilitate installation of the lightweight sleeve 1213. Alternatively, the lightweight sleeve 1213 may be constructed with a longitudinal through-slit, allowing it to be elastically opened and attached to the rigid tube 1211. The lightweight sleeve 1213 is made of rubber or soft silicone. Under the above settings, it is still necessary to consider how to set the operating reference frame on the operating handle 122 in a non-3D printing manner; the specific setting method is to set a setting hole 1214 that exceeds the non-circular cross-section of the channel and penetrates to the edge of the handle in the lightweight sleeve 1213, and correspondingly set a combination block 1215 that is combined with the setting hole 1214; a channel for the hard tube 1211 to pass through is set on the combination block 1215, and the combination block 1215 is made of high-strength material. The setting holes 1214 are combined to form a smooth lightweight cover 1213; a vertical rod extends from the combination block 1215, and the patient reference frame 3 is set on the vertical rod, and the setting hole 1214 is set in the middle of the lightweight cover 1213; in addition, the bottom surface of the combination block 1215 is a rectangular surface 1216, and the setting hole 1214 corresponds to a rectangular surface 1216. The combination of the two rectangular surfaces 1216 can prevent the combination block 1215 from shaking after assembly, thereby ensuring the stability of the position of the patient reference frame 3. A locking structure is provided for locking the operating handle 122 on the center rod 121. The specific structure is that the locking structure includes a locking threaded rod 21 and a locking cap 22. A locking threaded hole 23 corresponding to the locking rod is provided on the center rod 121. The locking threaded rod 21 is combined with the locking threaded hole 23, and the locking cap 22 is rotated to lock the operating handle 122 on the center rod 121. The assembly method of the operating handle 122 is as follows: first, the combination block 1215 is set into the combination hole, the blocking disk 1212 at one end of the hard tube 1211 is removed, the hard tube 1211 is inserted into the assembled lightweight sleeve 1213, and then the disassembled blocking disk 1212 is installed, thus completing the assembly of the operating handle 122; after the operating handle 122 is assembled, it is sleeved on the center rod 121, and then the operating handle 122 is locked in the appropriate position by rotating the locking cap.

[0055] A more preferred embodiment is to refer to Figure 8-Figure 9In order to avoid the stability of the reset pin during resetting and to prevent rotation during the resetting action, an anti-rotation structure 4 is sleeved on the reset pin, and a limiting structure 123 is correspondingly provided between the center rod 121 and the insertion portion, which is used to limit the anti-rotation structure 4 to the center rod 121 and the limiting ring extending outward from the center rod 121 or the insertion portion. The limiting structure 123 includes a limiting plane 1231, and the anti-rotation structure 4 is limited on the limiting plane 1231. This arrangement can effectively fix the anti-rotation structure 4 to an accurate position. Specifically, the anti-rotation structure 4 includes at least one plate-shaped structure 42 extending outward from the central axis of the reset pin, and a pin hole 421 for the anti-rotation pin 41 is provided on the plate-shaped structure 42. In this way, it is further ensured that the angle and position of the entire structure are avoided from changing when the operating structure is operated, thereby ensuring the accuracy of the tracking position. A plurality of nail insertion holes 421 are provided on the plate-shaped structure 42. The plurality of nail insertion holes 421 are provided, and the plurality of nail insertion holes 421 are arranged in a single row on the edge or in multiple rows and columns on the plate-shaped structure 42. This arrangement can ensure that a most suitable position is selected. A more preferred embodiment is that the plate-shaped structure 42 on one side is a fan-shaped structure with a fan-shaped cross-section, and the edge area of ​​the fan-shaped structure is provided with multiple nail insertion holes 421 along the edge. This arrangement can increase the coverage of the nail insertion holes 421 and ensure that there are holes facing the bone surface of the broken bone. The anti-rotation structure 4 also includes an anti-rotation nail 41. A depth limiting cap 411 is provided on the anti-rotation nail 41 to prevent the anti-rotation nail 41 from extending into the bone cavity and affecting the placement of the intramedullary nail. A more preferred embodiment is that after the anti-rotation nail 41 enters through the nail insertion hole 421, the position of its tip is flush with the tip of the insertion part. Because the insertion portion is inserted first, the flush setting can effectively prevent the anti-rotation nail 41 from being inserted deeper than the insertion portion. When setting, it is only necessary to ensure that the insertion portion is inserted safely to reduce the difficulty of setting the anti-rotation nail 41.

[0056] A more preferred implementation is: in order to better improve the tracking accuracy and reduce the shaking error caused by the combination of the center rod 121 and the channel with a non-circular cross-section, an arc-shaped protrusion 51 with a semicircular cross-section is provided on the anti-rotation structure 4, and the arc-shaped protrusion 51 is symmetrically arranged on the anti-rotation structure 4, and an arc-shaped recess 52 adapted to the arc-shaped protrusion 51 is provided on the blocking disk 1212 at the bottom of the operating handle 122, and the arc-shaped recess 52 is arranged in pairs along the outer periphery of the blocking disk 1212, and the central axis of each pair of arc-shaped recesses 52 is arranged on the same diameter; this setting can further lock the position, and the setting of multiple recesses can increase the options for angle settings and reduce the difficulty of selection. The symmetrical position limit can make the limit more secure.

[0057] A more preferred embodiment is as follows: a hole with a non-circular cross section is provided on the anti-rotation structure 4 , and the hole with a non-circular cross section is adapted to the shape of the center rod 121 , so as to facilitate the assembly and arrangement of the anti-rotation structure 4 .

[0058] The above is a clear and complete description of the technical solutions in the embodiments of the present invention through specific specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Those skilled in the art can easily understand the other advantages and functions of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation methods. In the absence of conflict, the above embodiments and features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

Claims

1. A reduction nail for reducing long bone fractures, characterized in that: It includes, an operating grip portion comprising a central rod having a non-circular cross-section; The inserting part includes the inserting rod section and the thread tip section. The insertion part is connected to the center rod with a non-circular cross section, the threaded tip section is inserted into the broken bone, and the operation of the gripping part drives the movement of the broken bone to complete the reduction.

2. The reduction nail according to claim 1, characterized in that The insertion rod section is a cylindrical rod, which is a solid metal rod with a diameter ranging from 6 to 12 mm.

3. The reduction nail according to claim 1, characterized in that The center rod and the inserted rod section are connected in one piece and made of the same material.

4. The reduction nail according to claim 1, characterized in that The central rod is a square rod, and the diameter of the circle of the cross section of the inserted rod segment is the same as the diameter of the inscribed circle of the cross section of the central rod.

5. The reduction nail according to claim 1, characterized in that Two reduction pins are placed, one on each broken bone.

6. The reduction nail according to claim 1, characterized in that A self-tapping groove is provided on the thread tip.

7. The reduction nail according to claim 1, characterized in that The first end of the thread tip section is a tip, and the opposite end is a second end. The second end of the thread tip section is provided with a depth limiting structure; the depth limiting structure includes a depth limiting plane with a diameter greater than the maximum diameter of the thread tip section, or the depth limiting plane is formed by an inserted rod portion with a diameter larger than that of the thread tip section.

8. The reduction nail according to claim 1, characterized in that The length of the thread tip ranges from 0.8 to 1.2 cm.

9. The reduction nail according to claim 1, characterized in that The length of the central rod portion is 10-15 cm, and the length of the insertion portion is set to 10-15 cm.

10. The reduction nail according to claim 1, characterized in that An anti-rotation structure is sleeved on the reset pin, which is used to combine with the insertion part to prevent the reset pin from rotating; a corresponding limiting structure is set between the center rod and the insertion part, which is used to limit the anti-rotation structure to the center rod and the limiting ring extending outward from the center rod or the insertion part. The limiting structure includes a limiting plane, and the anti-rotation structure is limited on the limiting plane.

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