Pressurizing intramedullary expansion locking nail

Abstract

The utility model discloses a pressurizing intramedullary expansion locking nail, which comprises an intramedullary nail body, and further comprises an external expansion fixing mechanism, an internal expansion nail, an expansion head and an expansion sleeve, a through cavity is arranged in the intramedullary nail body, the expansion head is arranged at the bottom end of the internal expansion nail, the internal expansion nail is arranged in the through cavity in a sliding manner, and the expansion sleeve is arranged in the through cavity. The external expansion fixing mechanisms are symmetrically arranged on the outer arc surface of the intramedullary nail body in a sliding mode, each external expansion fixing mechanism comprises an expansion sleeve, round holes are formed in the side walls of the intramedullary nail body, and the opposite side walls of the two expansion sleeves are fixedly installed with the end of a connecting rod; according to the intramedullary nail, the expansion sleeve capable of expanding outwards is further arranged on the outer side of the intramedullary nail body to conduct secondary fixation when the intramedullary nail body fixes an affected part, so that the stability of the intramedullary nail body for fixing the affected part is further improved, and healing of the injured part of a patient is accelerated.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a pressure intramedullary expansion locking nail. Background Technology

[0002] Intramedullary nailing is a commonly used internal fixation device in orthopedic surgery, generally used to treat limb fractures. It involves inserting steel or titanium nails into the medullary cavity to fix the fracture ends, promoting fracture healing and restoring bone function. Intramedullary nailing avoids long limb incisions, making it a minimally invasive surgical procedure. Compared to traditional open reduction and fixation surgery, it causes less damage and facilitates faster recovery.

[0003] A search revealed that the prior art, publication number CN205073002U, discloses a distally expandable self-locking intramedullary nail, comprising an intramedullary nail body, an expandable head, and a conical head. The tip of the conical head is vertically upward, and the expandable head has a positioning groove that matches the shape of the conical head. The conical head is located within the positioning groove of the expandable head and is coaxially arranged with the expandable head. The expandable head is conical in shape, composed of at least four elastic expansion strips, and fixed to the distal end of the intramedullary nail body. The intramedullary nail body has a channel penetrating through it at its center. A bolt A is threadedly fitted to the proximal end of the channel, and the lower end of bolt A is connected to one end of a traction rope. The other end of the traction rope is connected and fixed to the tip of the conical head via the channel. The proximal end of the intramedullary nail body has a cavity, and a bolt B is threadedly fitted to the upper end of the cavity. The beneficial effects of this utility model are: it solves the problems of unstable and difficult positioning of the distal intramedullary nail, reduces the difficulty of surgery, and improves the stability of surgery.

[0004] However, most existing intramedullary nails expand and fix the fractured bone by rotating the nail and unscrewing the expansion head in the temporal region of the bone marrow. However, fixing the nail by only using the expansion head is not effective and may cause the nail to shift, which may affect the healing of the injury. Therefore, a pressure-assisted intramedullary expansion-locking nail is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a pressure-pressurized intramedullary expansion locking nail, which provides secondary fixation of the intramedullary nail body when it is fixed to the patient's injury site by setting an expandable external fixation mechanism, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An intramedullary expansion locking nail includes an intramedullary nail body, an external expansion fixation mechanism, an internal expansion nail, an expansion head, and an expansion sleeve. The intramedullary nail body has a through cavity inside. The expansion head is disposed at the bottom end of the internal expansion nail. The internal expansion nail is slidably disposed inside the through cavity. The external expansion fixation mechanism is symmetrically slidably disposed on the outer arc surface of the intramedullary nail body.

[0008] The external expansion fixation mechanism includes an expansion sleeve. The sidewalls of the intramedullary nail body are respectively provided with circular holes. The opposite sidewalls of the two sets of expansion sleeves are respectively fixedly installed with the ends of the connecting rods. The other end of the connecting rod passes through the circular holes and is fixedly installed with the vertical plate. The opposite sidewalls of the vertical plate are respectively slidably connected with the outer arc surface of the internal expansion nail. The sidewall of the internal expansion nail is also provided with an ejection component for expanding the expansion sleeves outward.

[0009] Preferably, the outer arc surface of the expansion sleeve is provided with a number of protrusions, and the two sets of vertical plates are respectively provided with a first spring between the inner wall of the expansion sleeve and on both sides of the connecting rod.

[0010] Preferably, the ejection assembly includes a locking block, the top surface of the inner expansion pin is symmetrically provided with grooves, a second spring is respectively provided below the inner wall of the two sets of grooves that are close to each other, the end of the second spring is respectively provided with a locking block, the outer arc surface of the inner expansion pin is respectively provided with a through hole at the position below the groove, and the outer arc surface of the locking block is slidably connected to the inner wall of the through hole.

[0011] Preferably, a lever is provided on the top surface of the more distant end of each of the two sets of second springs, and the outer arc surface of the lever is slidably connected to the inner wall of the groove opened on the top surface of the inner expansion pin.

[0012] Preferably, the two sets of vertical plates have slots in the middle of their opposite sidewalls, and the ends of the locking blocks are respectively engaged with the slots.

[0013] Preferably, the outer arc surface above the internal expansion nail is provided with a rotating groove, and the interior of the rotating groove is slidably connected to a plurality of protrusions provided below the inner wall of the rotating sleeve. The outer arc surface of the rotating sleeve is threadedly connected to the upper inner wall of the intramedullary nail body.

[0014] Preferably, the top surface of the rotating screw sleeve is also symmetrically provided with handles to facilitate the worker to rotate the rotating screw sleeve.

[0015] Preferably, the inner wall of the top end of the intramedullary nail body is also threaded with a cap above the handle.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention provides a secondary fixation of the intramedullary nail body to the affected area by setting an expandable sleeve on the outside of the intramedullary nail body, thereby further increasing the stability of the intramedullary nail body in fixing the affected area and accelerating the healing of the patient's wound. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the expansion sleeve structure in its expanded state according to this utility model;

[0019] Figure 2 This is a schematic diagram of the original structure of the expansion sleeve of this utility model;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the intramedullary nail body of this utility model;

[0021] Figure 4 This is a schematic diagram of the inner wall structure of the expansion sleeve of this utility model;

[0022] Figure 5 This is a schematic diagram of the cross-sectional structure of the internal expansion pin of this utility model.

[0023] In the diagram: 1. Intramedullary nail body; 2. Cap; 3. External expansion fixation mechanism; 4. Through cavity; 5. Rotating screw sleeve; 6. Internal expansion nail; 7. Expansion head; 8. Expansion sleeve; 9. Vertical plate; 10. First spring; 11. Connecting rod; 12. Handle; 13. Protrusion; 14. Groove; 15. Rotary groove; 16. Second spring; 17. Locking block; 18. Lever; 19. Through hole; 20. Locking slot. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-5 This utility model provides a technical solution:

[0026] An intramedullary expansion locking nail includes an intramedullary nail body 1, an external expansion fixation mechanism 3, an internal expansion nail 6, an expansion head 7, and an expansion sleeve 8. The intramedullary nail body 1 has a through cavity 4 inside. The expansion head 7 is disposed at the bottom end of the internal expansion nail 6. The internal expansion nail 6 is slidably disposed inside the through cavity 4. The external expansion fixation mechanism 3 is symmetrically slidably disposed on the outer arc surface of the intramedullary nail body 1.

[0027] The external expansion fixation mechanism 3 includes expansion sleeves 8. The side walls of the intramedullary nail body 1 are respectively provided with round holes. The opposite side walls of the two sets of expansion sleeves 8 are respectively fixedly installed with the ends of the connecting rods 11. The other end of the connecting rods 11 passes through the round holes and is fixedly installed with the vertical plate 9. The opposite side walls of the vertical plate 9 are respectively slidably connected with the outer arc surface of the inner expansion nail 6. The side wall of the inner expansion nail 6 is also provided with an ejection component for expanding the expansion sleeves 8 outward.

[0028] By symmetrically providing expandable sleeves 8 on the outer side of the intramedullary nail body 1, the intramedullary nail body 1 is installed for secondary fixation, further ensuring the stability of the intramedullary nail body 1 fixed to the patient's injury site, thereby accelerating the healing of the patient's injury site.

[0029] The outer arc surface of the expansion sleeve 8 is provided with several protrusions. Two sets of vertical plates 9 are respectively provided with first springs 10 between the inner wall of the expansion sleeve 8 and on both sides of the connecting rod 11. By providing several protrusions on the outer arc surface of the expansion sleeve 8, the contact area between the intramedullary nail body 1 and the inner wall of the bone marrow is increased by the protrusions, thereby further ensuring the stability of the intramedullary nail body 1 during use. At the same time, the first springs 10 are respectively provided between the vertical plates 9 and the expansion sleeve 8 and on both sides of the first springs 10. The first springs 10 buffer the impact force of the expansion sleeve 8 expanding outward, avoiding damage to the patient's bone marrow by the expansion sleeve 8, and the protrusions will not damage the internal tissue of the patient's bone marrow, thereby further accelerating the healing of the patient's wound.

[0030] The ejection assembly includes a locking block 17. The top surface of the inner expansion pin 6 is symmetrically provided with grooves 14. The inner walls of the two sets of grooves 14 that are close to each other are respectively provided with second springs 16. The ends of the second springs 16 are respectively provided with locking blocks 17. The outer arc surface of the inner expansion pin 6 is provided with through holes 19 located below the grooves 14. The outer arc surface of the locking block 17 is slidably connected to the inner wall of the through hole 19.

[0031] Two sets of locking blocks 17 are slidably disposed inside the through holes 19 opened on the outer arc surfaces of the inner expansion nail 6. The ends of the locking blocks 17 located inside the grooves 14 are fixedly installed with one end of the second spring 16, and the other end of the second spring 16 is fixedly installed with the inner walls of the two sets of grooves 14. This is so that when the inner expansion nail 6 rotates above and the screw sleeve 5 is threadedly connected to the inner wall of the intramedullary nail body 1 and moves into the intramedullary nail body 1, the bottom surface of the locking block 17 at the contact with the vertical plate 9 is set as an inclined surface, and the elastic force of the second spring 16 is greater than that of the first spring 10. The locking block 17 presses the vertical plate 9, thereby causing the locking block 17 to move into the slot 20 opened on the side wall of the vertical plate 9 and push the expansion sleeve 8 outward, so as to perform secondary fixation of the intramedullary nail body 1 in the bone marrow, increase the stability of the intramedullary nail body 1 during installation, and prevent the intramedullary nail body 1 from shaking when it is in the affected area.

[0032] Each of the two sets of second springs 16 has a lever 18 on its far end top surface. The outer arc surface of the lever 18 is slidably connected to the inner wall of the groove 14 opened on the top surface of the inner expansion nail 6. By providing levers 18 on the far end top surfaces of the two sets of second springs 16, and having the end of the lever 18 penetrate the top surface of the inner expansion nail 6 and slidably connected to the inner wall of the groove 14 opened on the top surface of the inner expansion nail 6, medical personnel can easily pull the two sets of levers 18 inward to pull the locking block 17 out of the slot 20 on the side wall of the vertical plate 9. After rotating the rotating screw sleeve 5 from inside the intramedullary nail body 1, the expansion sleeve 8 fits against the side wall of the intramedullary nail body 1, thereby disassembling the intramedullary nail body 1.

[0033] The two sets of vertical plates 9 each have a slot 20 in the middle of their opposite sidewalls. The ends of the locking blocks 17 are engaged with the slots 20 respectively. By engaging the ends of the vertical plates 9 with the locking blocks 17, the stability of the locking blocks 17 when pushing the expansion sleeve 8 to expand is increased.

[0034] The outer arc surface above the internal expansion nail 6 is provided with a rotating groove 15. The interior of the rotating groove 15 is slidably connected to a plurality of protrusions 13 provided below the inner wall of the rotating sleeve 5. The outer arc surface of the rotating sleeve 5 is threadedly connected to the upper inner wall of the intramedullary nail body 1.

[0035] A rotating groove 15 is provided on the outer arc surface above the inner expansion nail 6, and the inner wall of the rotating groove 15 is slidably connected to a plurality of protrusions 13 fixedly provided on the inner wall of the rotating sleeve 5, so that when the rotating sleeve 5 is screwed into the inner part of the intramedullary nail body 1, the inner expansion nail 6 is driven to move downward into the inner part of the intramedullary nail body 1.

[0036] The top surface of the rotating screw sleeve 5 is also symmetrically provided with handles 12 to facilitate medical staff to rotate the rotating screw sleeve 5. By symmetrically providing handles 12 on the top surface of the rotating screw sleeve 5, medical staff can easily screw the rotating screw sleeve 5 in and out.

[0037] The inner wall of the top end of the intramedullary nail body 1 is also threaded with a cap 2 above the handle 12. The cap 2 is threaded with the inner wall of the top end of the intramedullary nail body 1 above the handle 12 to protect the internal expansion nail 6 inside the intramedullary nail body 1.

[0038] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pressure-operated intramedullary expansion locking nail, comprising an intramedullary nail body (1), characterized in that: It also includes an external expansion fixation mechanism (3), an internal expansion nail (6), an expansion head (7), and an expansion sleeve (8). The interior of the intramedullary nail body (1) has a through cavity (4). The expansion head (7) is located at the bottom end of the internal expansion nail (6). The internal expansion nail (6) is slidably located inside the through cavity (4). The external expansion fixation mechanism (3) is symmetrically slidably located on the outer arc surface of the intramedullary nail body (1). The external expansion fixing mechanism (3) includes an expansion sleeve (8). The sidewalls of the intramedullary nail body (1) are respectively provided with round holes. The opposite sidewalls of the two sets of expansion sleeves (8) are respectively fixedly installed with the ends of the connecting rod (11). The other end of the connecting rod (11) passes through the round hole and is fixedly installed with the vertical plate (9). The opposite sidewalls of the vertical plate (9) are respectively slidably connected with the outer arc surface of the inner expansion nail (6). The sidewall of the inner expansion nail (6) is also provided with an ejection component for expanding the expansion sleeve (8) outward.

2. The pressure-applied intramedullary expansion locking nail according to claim 1, characterized in that: The outer arc surface of the expansion sleeve (8) is provided with several protrusions, and the two sets of vertical plates (9) are respectively provided with first springs (10) between the inner wall of the expansion sleeve (8) and on both sides of the connecting rod (11).

3. The pressure-applied intramedullary expansion locking nail according to claim 2, characterized in that: The ejection assembly includes a locking block (17), and the top surface of the inner expansion pin (6) is symmetrically provided with grooves (14). The inner walls of the two sets of grooves (14) are respectively provided with second springs (16) below each other. The ends of the second springs (16) are respectively provided with locking blocks (17). The outer arc surface of the inner expansion pin (6) is provided with through holes (19) below the grooves (14). The outer arc surface of the locking block (17) is slidably connected to the inner wall of the through hole (19).

4. The pressure-applied intramedullary expansion locking nail according to claim 3, characterized in that: Both sets of the second springs (16) have levers (18) on the top surface of the far end. The outer arc surface of the levers (18) is slidably connected to the inner wall of the groove (14) opened on the top surface of the inner expansion pin (6).

5. The pressure-applied intramedullary expansion locking nail according to claim 4, characterized in that: Both sets of vertical plates (9) have slots (20) in the middle of their opposite side walls, and the ends of the locking blocks (17) are respectively engaged with the slots (20).

6. The pressure-applied intramedullary expansion locking nail according to claim 5, characterized in that: The outer arc surface above the inner expansion nail (6) is provided with a rotating groove (15). The interior of the rotating groove (15) is slidably connected to a plurality of protrusions (13) provided below the inner wall of the rotating sleeve (5). The outer arc surface of the rotating sleeve (5) is threadedly connected to the upper inner wall of the intramedullary nail body (1).

7. The pressure-applied intramedullary expansion locking nail according to claim 6, characterized in that: The top surface of the rotating screw sleeve (5) is also symmetrically provided with handles (12) to facilitate workers to rotate the rotating screw sleeve (5).

8. The pressure-applied intramedullary expansion locking nail according to claim 7, characterized in that: The inner wall of the top of the intramedullary nail body (1) is also threaded with a cap (2) above the handle (12).

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