Intramedullary distraction screw for calcaneal fracture

Abstract

The intramedullary distraction screw comprises a screw body, a screw head is arranged at one end of the screw body, the outer diameter of the screw head is larger than that of the screw body, external threads are arranged on the outer wall of the screw head, the outer wall of the screw body is smooth, a matching groove is formed in the end face of the screw head, and the matching groove is matched with the screw head. A guide hole is formed in the other end of the screw body, the length direction of the guide hole extends in the length direction of the screw body, the screw body is matched with a guide piece through the guide hole and extends into the calcaneus of a patient, and the other end of the screw body is conical. Through the application of the intramedullary distraction screw for calcaneal fracture, the guide hole is matched with the guide piece, so that the screw body extends into the calcaneus of a patient, an incision is prevented from being formed in soft tissue of the patient, complications are avoided, and recovery of the patient is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to an intramedullary distraction screw for calcaneal fractures. Background Art

[0002] Clinically, calcaneal fractures involving loss of height / length often require open reduction. Currently, common surgical procedures require a lateral L-shaped incision or a tarsal sinus incision for reduction under direct vision to restore the height, length, and integrity of the posterior joint surface. However, the above methods involve longer soft tissue incisions and more soft tissue stripping, which in turn cause greater surgical trauma. In addition, open reduction often requires surgery after the soft tissue swelling has basically subsided, otherwise it is easy to cause excessive swelling of the skin and related complications. Long waiting time and immobilization can cause complications such as lower limb thrombosis and pressure sores, which are not conducive to the patient's recovery. Summary of the invention

[0003] In view of this, in order to solve the above problems, the object of the present invention is to provide an intramedullary distraction screw for calcaneal fracture, comprising:

[0004] A screw body, one end of the screw body is provided with a screw head, the outer diameter of the screw head is larger than the outer diameter of the screw body, the outer wall of the screw head is provided with an external thread, the outer wall of the screw body is smoothly arranged, the end face of the screw head is provided with a matching groove, the other end of the screw body is provided with a guide hole, the length direction of the guide hole extends along the length direction of the screw body, the screw body cooperates with a guide member through the guide hole and extends into the patient's calcaneus, and the other end of the screw body is conically arranged.

[0005] In another preferred embodiment, the length of the screw head is 5 mm.

[0006] In another preferred embodiment, the inner contour of the matching groove is hexagonal.

[0007] In another preferred embodiment, the depth of the guide hole is equal to the length of the screw body.

[0008] In another preferred embodiment, the screw body and the screw head are integrally arranged.

[0009] In another preferred embodiment, the guide member is a guide needle.

[0010] Due to the adoption of the above technical solution, the present invention has the following positive effects compared with the prior art: through the application of the present invention, an intramedullary distraction screw for calcaneal fracture is provided, and through the cooperation of the guide hole and the guide member, the screw body is extended into the patient's calcaneus, avoiding leaving an incision on the patient's soft tissue, thereby avoiding the occurrence of complications and facilitating the patient's recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of a first embodiment of a screw body of an intramedullary distraction screw for calcaneal fracture of the present invention;

[0012] Figure 2 It is a schematic diagram of a first embodiment of a wire tap for an intramedullary distraction screw for calcaneal fracture according to the present invention;

[0013] Figure 3 It is a schematic diagram of a second embodiment of a screw body of an intramedullary distraction screw for calcaneal fracture of the present invention;

[0014] Figure 4 It is a schematic diagram of a first embodiment of a guide pin for an intramedullary distraction screw for calcaneal fracture according to the present invention;

[0015] Figure 5 It is a schematic diagram of a third embodiment of a screw body of an intramedullary distraction screw for calcaneal fracture of the present invention;

[0016] Figure 6 It is a schematic diagram of a third embodiment of a screw body of an intramedullary distraction screw for calcaneal fracture of the present invention in a distracted state;

[0017] Figure 7 It is a schematic diagram of a second embodiment of a guide pin for an intramedullary distraction screw for calcaneal fracture according to the present invention;

[0018] Figure 8 It is a schematic diagram of a second embodiment of a wire tap for an intramedullary distraction screw for calcaneal fracture according to the present invention.

[0019] In the accompanying drawings: 1. screw body; 2. screw head; 3. matching groove; 4. guide hole; 5. tap; 6. first main body; 7. second main body; 8. first channel; 9. second channel; 10. guide needle; 11. front needle body; 12. rear needle body; 13. expansion ring; 14. expansion plate; 15. first needle body; 16. second needle body. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0021] like Figures 1 to 8As shown, a preferred embodiment of an intramedullary distraction screw for calcaneal fracture is shown, comprising:

[0022] A screw body 1, one end of the screw body 1 is provided with a screw head 2, the outer diameter of the screw head 2 is larger than the outer diameter of the screw body 1, the outer wall of the screw head 2 is provided with an external thread, the outer wall of the screw body 1 is smoothly arranged, the end face of the screw head 2 is provided with a matching groove 3, the other end of the screw body 1 is provided with a guide hole 4, the length direction of the guide hole 4 extends along the length direction of the screw body 1, the screw body 1 cooperates with a guide member through the guide hole 4 and extends into the patient's calcaneus, and the other end of the screw body 1 is conical.

[0023] In actual use, the position of the patient's calcaneal fracture is first determined, a bone channel is opened at the corresponding position of the calcaneal through a tap 5, and then the guide pin is rotated into the bone channel, and then the screw body 1 and the screw head 2 are screwed into the bone channel through the cooperation of the guide hole 4 and the guide pin. Furthermore, the bone channel includes a first channel portion and a second channel portion that are connected, the inner diameter of the second channel portion is larger than the inner diameter of the first channel portion, and the inner wall of the second channel portion is provided with an internal thread, and the internal thread of the second channel portion matches the external thread of the screw head 2, so that the screw body 1 is fixed in the bone channel, and the fixing effect is enhanced.

[0024] Further, as a preferred embodiment, the tap 5 includes a first thread segment and a second thread segment, the outer diameter of the first thread segment is equal to the outer diameter of the screw head 2, and the outer diameter of the second thread segment is equal to the outer diameter of the screw body 1. Figure 2 As shown, in actual use, when a bone channel is opened by the tap 5, the second threaded section of the tap 5 first opens a bone channel. At this time, the length of the bone channel is equal to the length of the second threaded section of the tap 5. The tap 5 continues to work. At this time, the first threaded section of the tap 5 opens a first channel portion of the bone channel in the bone channel opened by the second threaded section, and the second threaded section continues forward to open a second channel portion to facilitate the installation of the screw body 1 and the screw head 2.

[0025] Further, as a preferred embodiment, the length of the screw head 2 is 5 mm.

[0026] Further, as a preferred embodiment, the inner contour of the matching groove 3 is hexagonal. Further, the inner contour of the matching groove 3 is hexagonal, which is not prone to thread slippage, and is convenient for installing the screw body 1.

[0027] Further, as a preferred embodiment, the depth of the guide hole 4 is equal to the length of the screw body 1 .

[0028] Furthermore, as a preferred embodiment, the screw body 1 and the screw head 2 are integrally arranged.

[0029] Further, as a preferred embodiment, the guide member is a guide needle.

[0030] Further, as a preferred embodiment, the inner wall of the matching groove 3 is provided with an internal thread. Further, the rotation direction of the internal thread of the inner wall of the matching groove 3 is opposite to the rotation direction of the external thread of the outer wall of the screw head 2, making it easier to remove the screw body 1.

[0031] Further, as a preferred embodiment, the screw body 1 also includes: a first main body portion 6 and a second main body portion 7, one end of the first main body portion 6 is installed on the screw head 2, the other end of the first main body portion 6 is installed on one end of the second body, the outer diameter of the first main body portion 6 is smaller than the outer diameter of the second main body portion 7, a first hole 8 is opened in the first main body portion 6, the inner wall of the first hole 8 is opened with an internal thread, a second hole 9 is opened in the second main body portion 7, the inner diameter of the first hole 8 is smaller than the inner diameter of the second hole 9, the first hole 8 and the second hole 9 are connected to each other to form a guide hole 4.

[0032] Further, as a preferred embodiment, the guide needle 10 comprises: a front needle body 11 and a rear needle body 12, one end of the front needle body 11 is mounted on one end of the rear needle body 12, the outer diameter of the front needle body 11 is smaller than the outer diameter of the rear needle body 12, the outer wall of the front needle body 11 is provided with an external thread, the front needle body 11 matches the first hole 8, and the rear needle body 12 matches the second hole 9. Further, as Figure 3 to Figure 4 As shown, in actual use, the first main body 6 and the second main body 7, the front needle body 11 and the rear needle body 12 are all arranged in an integrated manner, a bone channel is opened at the corresponding position of the calcaneus through the tap 5, the guide pin 10 is installed in the bone channel, and then the screw body 1 is sleeved on the front needle body 11 and the rear needle body 12 of the guide pin 10 through the first hole 8 and the second hole 9, and the screw body 1 and the guide pin 10 are fixed by the internal thread of the first hole 8 and the external thread of the front needle body 11. Furthermore, the outer diameter of the other end of the rear needle body 12 is gradually increased in the direction away from the front needle body 11, so that the rear needle body 12 is stuck against the inner wall of the second hole 9, so that the connection between the guide pin 10 and the screw body 1 is more stable.

[0033] Furthermore, as a preferred embodiment, it also includes: a support ring 13 and a plurality of support plates 14, one end of each of the support plates 14 is installed on the other end of the screw body 1, and the plurality of support plates 14 are arranged in sequence along the circumference of the screw body 1, and the other ends of each of the support plates 14 are installed on one end of the support ring 13, the matching groove 3 is connected to the guide hole 4, one end of the guide needle 10 can be operably passed through the support ring 13 and the guide hole 4 and is flush with the bottom of the matching groove 3, and the other end of the guide needle 10 can be operably moved to move the support ring 13 in a direction close to the screw head 2.

[0034] Further, as a preferred embodiment, the guide needle 10 includes: a first needle body portion 15 and a second needle body portion 16, one end of the first needle body portion 15 can be operably passed through the expansion ring 13 and the guide hole 4 and flush with the bottom of the matching groove 3, the other end of the first needle body portion 15 is provided with a groove, the inner wall of the groove is provided with a connecting thread, the other end of the first needle body portion 15 is installed on one end of the second needle body portion 16, the outer wall of the other end of the second needle body portion 16 is provided with an external thread, the inner wall of the expansion ring 13 is provided with an internal thread, the outer wall of the other end of the second needle body portion 16 is threadedly connected with the inner wall of the expansion ring 13, and the other end of the second needle body portion 16 can be operably moved to move the expansion ring 13 in a direction close to the screw head 2. Further, as Figures 5 to 7 As shown, in actual use, the first needle body portion 15 and the second needle body portion 16 are integrally arranged, a bone channel is opened at the corresponding position of the calcaneus by means of the tap 5, the guide needle 10 is installed in the bone channel, and then the other end of the screw body 1 is installed on the guide needle 10, so that one end of the first needle body portion 15 of the guide needle 10 passes through the expansion ring 13 and the guide hole 4 in sequence, and then the screw body 1 is turned again. At this time, the expansion ring 13 is fixed to the other end of the second needle body portion, and the screw body 1 begins to squeeze the plurality of expansion plates 14, so that the plurality of expansion plates 14 bend outward along the radial direction of the screw body 1 to be stuck on the bone channel, thereby ensuring the stability of the screw body 1.

[0035] Furthermore, as a preferred embodiment, the outer wall of the tap 5 is provided with an external thread, the pitch of the external thread of the tap 5 is gradually increased from one end of the tap 5 to the other end, and the outer diameter of the other end of the tap 5 is gradually increased along the end away from the tap 5.

[0036] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An intramedullary distraction screw for calcaneal fracture, characterized in that: include: A screw body, one end of the screw body is provided with a screw head, the outer diameter of the screw head is larger than the outer diameter of the screw body, the outer wall of the screw head is provided with an external thread, the outer wall of the screw body is smoothly arranged, the end face of the screw head is provided with a matching groove, the other end of the screw body is provided with a guide hole, the length direction of the guide hole extends along the length direction of the screw body, the screw body cooperates with a guide member through the guide hole and extends into the patient's calcaneus, and the other end of the screw body is conically arranged.

2. The intramedullary distraction screw for calcaneal fracture according to claim 1, characterized in that: The length of the screw head is 5 mm.

3. The intramedullary distraction screw for calcaneal fracture according to claim 1, characterized in that: The inner contour of the matching groove is hexagonal.

4. The intramedullary distraction screw for calcaneal fracture according to claim 1, characterized in that: The depth of the guide hole is equal to the length of the screw body.

5. The intramedullary distraction screw for calcaneal fracture according to claim 1, characterized in that: The screw body and the screw head are arranged in one piece.

6. The intramedullary distraction screw for calcaneal fracture according to claim 1, characterized in that: The guide member is a guide needle.

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