Nail sheath fixing device for vertebral slippage reduction

Abstract

The utility model discloses a nail sheath fixing device for vertebral slippage reduction, which comprises a distractable nail sheath, a clamping cylinder and a fixing screw, the clamping cylinder is arranged in the distractable nail sheath, the clamping cylinder is clamped with the distractable nail sheath, the fixing screw is arranged in the distractable nail sheath, and the fixing screw is in threaded connection with the distractable nail sheath. The vertebral plate fixing device has the beneficial effect that the purpose of reducing the increased injury to the vertebrae due to repeated operation is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field related to a nail sheath fixing system, in particular to a nail sheath fixing device for vertebral body slippage reduction. Background Art

[0002] The surgery for vertebral slippage reduction requires screw sheath fixation and traction, which are usually fixed directly to the vertebra by screws. However, screws can easily cause small injuries inside the vertebra, and if the screws are not properly inserted, secondary damage to the vertebra can be easily caused.

[0003] The Chinese patent publication number is CN213665476U, and the authorization announcement date is July 13, 2021. A cruciate ligament tibial nail sheath fixation system disclosed includes a nail sheath, an extrusion nail, and a fixing plate. The nail sheath is used to insert into the tibial bone tunnel, and the extrusion nail is used to squeeze into the nail sheath, and the sheath wall of the extrusion nail sheath presses the tendon located in the tibial bone tunnel toward the side wall of the tibial bone tunnel. The tail end of the extrusion nail is provided with a guide hole for cooperating with the guide rod, and the fixing plate is used to press the stump of the tendon exposed from the tibial bone tunnel onto the tibial bone surface. The fixing plate is provided with a plurality of fixing tips for nailing into the tibia; when the tail end of the extrusion nail is connected to the fixing plate, the fixing plate is provided with a first avoidance hole connected to the guide hole; or when the tail end of the nail sheath is connected to the fixing plate, the fixing plate is provided with a second avoidance hole for the extrusion nail to squeeze into the nail sheath. The utility model can improve the fixation effect of the tendon at the tibial end. The disadvantage of the utility model is that it cannot reduce the increased damage to the vertebrae due to repeated operations. Utility Model Content

[0004] The utility model aims to overcome the disadvantage of the prior art that repeated operations easily cause increased damage to the vertebrae, and provides a nail sheath fixing device for vertebral body slippage reduction, which can reduce the increased damage to the vertebrae caused by repeated operations.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A nail sheath fixing device for vertebral slippage reduction comprises an expandable nail sheath, a cartridge and a fixing screw, wherein the cartridge is placed in the expandable nail sheath and is clamped with the expandable nail sheath, the fixing screw is placed in the expandable nail sheath and is threadedly connected with the expandable nail sheath.

[0007] During packaging, sterile operation is performed throughout the process. The cartridge is embedded in the expandable nail sheath, and the expandable nail sheath is clamped so that its outer surface does not protrude. Then the expandable nail sheath, the cartridge and the fixing screw are placed in a sterile packaging bag and sealed. During use, the cartridge and the fixed nail sheath are first taken out of the sterile packaging bag, and the exposed part of the cartridge is held throughout the process. The expandable nail sheath is moved to the position where the implantation surgery is required and the hole has been opened. Since the expandable nail sheath is first in a smooth outer surface, the cartridge is then pinched inwards, and the nail sheath protective cover is moved out of the fixed nail sheath. The expandable nail sheath is fixed in the installed surgical site to a certain extent, and then the fixing screw is placed in the expandable nail sheath and begins to tighten downward. During this process, the fixing screw first squeezes the contents of the expandable nail sheath outward, and then makes the contents of the expandable nail sheath begin to bulge outward, and then the expandable nail sheath is tightly fixed to the surgical site, and then several expandable nail sheaths together with the cartridge and fixing screws are repeated to form a straight line, and then several fixing screws are connected with a long rod, and finally a short tail nail is placed above the fixing screw to fix the long rod, and these are used to reset the vertebra to the correct position. With the expandable nail sheath, even if the fixing screw does not reach the appropriate depth, or there are other problems, the fixing screw can be adjusted, so that the vertebral body will not be injured, thereby achieving the purpose of reducing the damage to the vertebrae caused by repeated operations.

[0008] Preferably, the expandable nail sheath is provided with an expandable piece 1 and a through hole 1, the through hole 1 is provided with a plurality of pieces and is uniformly surrounded on the expandable nail sheath with the expandable nail sheath as the center, the expandable piece 1 is placed in the through hole 1, the lower end surface of the expandable piece 1 is fixedly connected to the lower bottom surface in the through hole 1, the expandable piece 1 and the expandable nail sheath are integrally formed, the clamping cylinder is respectively clamped with the expandable nail sheath and the expandable piece 1, the fixing screw is respectively threadedly connected with the expandable nail sheath and the expandable piece 1, a clamping block is provided on the inner side surface of the expandable piece 1, and the clamping block is fixedly connected to the inner side surface of the expandable piece 1. The lower bottom surface of the through hole 1 is fixedly connected to the lower end surface of the expandable piece, so as to facilitate the subsequent expansion.

[0009] Preferably, a card slot is provided on the upper end surface of the card block, and a plurality of cards are provided on the lower end surface of the cartridge. The upper end surface of the card is fixedly connected to the lower end surface of the cartridge, and the card corresponds to the card slot. The card is connected to the expansion piece 1 through the card slot, and the cartridge is connected to the expandable nail sheath through the card. The fixing screw is threadedly connected to the card block, and a card strip is provided on the outer side surface of the card. The card strip and the card are integrally formed. A guide groove is provided on the inner wall of the expandable nail sheath, and the guide groove corresponds to the card strip one by one. The side wall in the guide groove contacts the side wall of the card strip, and the card is connected to the expandable nail sheath through the cooperation of the card strip and the guide groove. The card slot allows the card to retract the expansion piece 1 inward, and the guide groove and the card strip can prevent the expandable nail sheath from detaching when the card is transported and the fixed nail sheath is installed, thereby reducing the probability of contamination.

[0010] Preferably, an extension head is provided on the upper end surface of the fixing screw, the lower end surface of the extension head is fixedly connected to the fixing screw, a groove and a U-shaped groove are provided on the extension head, the groove is placed on the upper end surface of the extension head, an internal thread and a cutter head hole are provided on the groove, there are two U-shaped grooves and they are placed on both sides of the extension head respectively, the two U-shaped grooves correspond to each other, the U-shaped groove is connected to the groove, and the cutter head hole is placed on the bottom surface of the groove. The U-shaped groove allows the long rod to pass through for resetting, and the groove and the internal thread are used to install a short tail nail to fix the long rod.

[0011] Preferably, the first expansion piece is provided with a latching tooth, and there are several latching teeth evenly distributed on the outer side of the first expansion piece, and the latching teeth are integrally formed with the first expansion piece, and the cross-sectional shape of the clamping block is trapezoidal, and the trapezoidal cross-sectional shape of the clamping block is upward and the short side is inward, and the inner side of the expandable nail sheath and the short side of the trapezoidal cross-sectional shape of the clamping block are both provided with internal threads 2, and the fixing screw is respectively threadedly connected with the clamping block and the expandable nail sheath through the internal threads 2. The cross-sectional shape of the clamping block is trapezoidal, so that the fixing screw can pass through the middle of the clamping block when it is screwed down and drive the expansion piece to open outward, and the latching teeth can improve the fixing effect of the first expansion piece.

[0012] Preferably, the lower end surface of the expandable nail sheath is provided with a second through hole, and the lower end surface of the expandable nail sheath is provided with a second expansion piece, and the second expansion piece is provided in a plurality and evenly distributed with the second through hole as the center, and the second expansion piece and the expandable nail sheath are integrally formed. The second expansion piece facilitates the downward movement of the fixing screw and allows the expandable nail sheath to be more closely attached to the surgical site.

[0013] The beneficial effects of the utility model are: reducing the purpose of increasing damage to the vertebrae due to repeated operations; the lower bottom surface of the through hole one is fixedly connected to the lower end surface of the expansion piece, which is convenient for subsequent expansion; the card slot allows the card to retract the expansion piece one inward, and the guide groove and the card strip can prevent the expandable nail sheath from detaching during transportation and installation of the fixed nail sheath, thereby reducing the probability of contamination; the cross-section of the card block is trapezoidal, so that the fixing screw can accurately pass through the middle of the card block when it is screwed down and drive the expansion piece to open outward; the U-shaped groove allows the long rod to pass through for resetting, and the groove and the internal thread one are used to install the short tail nail to fix the long rod; the cross-section of the card block is trapezoidal, so that the fixing screw can pass through the middle of the card block when it is screwed down and drive the expansion piece to open outward, and the card teeth can improve the fixing effect of the expansion piece one; the expansion piece two is convenient for the fixing screw to move downward, and can make the expandable nail sheath closer to the surgical site. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Figure 2 is a cross-sectional view of the front view of the cartridge placed in the expandable nail sheath;

[0016] Figure 3 yes Figure 2 AA cross-section diagram;

[0017] Figure 4 yes Figure 2 An enlarged view of detail B;

[0018] Figure 5 It is a cross-sectional view of the front view with the fixing screw placed in the expandable nail sheath.

[0019] In the figure: 1. expandable nail sheath, 2. cartridge, 3. fixing screw, 4. expander plate 1, 5. through hole 1, 6. clamping block, 7. clamping slot, 8. card, 9. clamping strip, 10. guide slot, 11. extension head, 12. groove, 13. U-shaped slot, 14. internal thread 1, 15. cutter head hole, 16. clamping teeth, 17. internal thread (13), 18. through hole 2, 19. expander plate 2. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0021] like Figure 1 , Figure 2 and Figure 5 In an embodiment, a nail sheath fixing device for vertebral slippage reduction includes an expandable nail sheath 1, a cartridge 2 and a fixing screw 3, the cartridge 2 is placed in the expandable nail sheath 1, the cartridge 2 is clamped with the expandable nail sheath 1, the fixing screw 3 is placed in the expandable nail sheath 1, and the fixing screw 3 is threadably connected to the expandable nail sheath 1.

[0022] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the expandable nail sheath 1 is provided with an expansion piece 4 and a through hole 5, there are several through holes 5 and they are evenly surrounded on the expandable nail sheath 1 with the expandable nail sheath 1 as the center, the expansion piece 4 is placed in the through hole 5, the lower end surface of the expansion piece 4 is fixedly connected to the lower bottom surface in the through hole 5, the expansion piece 4 and the expandable nail sheath 1 are integrally formed, the clamping cylinder 2 is respectively clamped with the expandable nail sheath 1 and the expansion piece 4, the fixing screw 3 is respectively threadedly connected with the expandable nail sheath 1 and the expansion piece 4, a clamping block 6 is provided on the inner side surface of the expansion piece 4, and the clamping block 6 is fixedly connected to the inner side surface of the expansion piece 4.

[0023] like Figure 2 , Figure 3 and Figure 4As shown, a card slot 7 is provided on the upper end surface of the card block 6, and a plurality of cards 8 are provided on the lower end surface of the cartridge 2. The upper end surface of the card 8 is fixedly connected to the lower end surface of the cartridge 2, and the card 8 corresponds to the card slot 7. The card 8 is clamped with the expansion piece 4 through the card slot 7, and the cartridge 2 is clamped with the expandable nail sheath 1 through the card 8. The fixing screw 3 is threadedly connected with the card block 6. A clamping strip 9 is provided on the outer side surface of the card 8, and the clamping strip 9 and the card 8 are integrally formed. A guide groove 10 is provided on the inner wall of the expandable nail sheath 1, and the guide groove 10 corresponds to the clamping strip 9 one by one, and the side wall in the guide groove 10 contacts with the side wall of the clamping strip 9, and the card 8 is clamped with the expandable nail sheath 1 through the cooperation of the clamping strip 9 and the guide groove 10.

[0024] like Figure 1 and Figure 5 As shown, an extension head 11 is provided on the upper end surface of the fixing screw 3, and the lower end surface of the extension head 11 is fixedly connected to the fixing screw 3. A groove 12 and a U-shaped groove 13 are provided on the extension head 11. The groove 12 is placed on the upper end surface of the extension head 11, and an internal thread 14 and a tool head hole 15 are provided on the groove 12. There are two U-shaped grooves 13 and they are respectively placed on both sides of the extension head 11. The two U-shaped grooves 13 correspond to each other, and the U-shaped groove 13 is connected to the groove 12. The tool head hole 15 is placed on the bottom surface of the groove 12.

[0025] like Figure 2 , Figure 4 and Figure 5 As shown, a latch tooth 16 is provided on the expansion piece 4, and there are several latch teeth 16 which are evenly distributed on the outer side of the expansion piece 4. The latch teeth 16 and the expansion piece 4 are integrally formed. The cross-sectional shape of the clamping block 6 is trapezoidal, and the oblique side of the trapezoidal cross-section of the clamping block 6 faces upward and the short side faces inward. Internal threads 17 are provided on the inner side surface of the expandable nail sheath 1 and the short side of the trapezoidal cross-section of the clamping block 6. The fixing screw 3 is threadedly connected to the clamping block 6 and the expandable nail sheath 1 through the internal threads 17.

[0026] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the lower end surface of the expandable nail sheath 1 is provided with a through hole 2 18, and the lower end surface of the expandable nail sheath 1 is provided with an expansion piece 2 19. There are a plurality of expansion pieces 19 and they are evenly distributed around the through hole 2 18. The expansion pieces 19 and the expandable nail sheath 1 are integrally formed.

[0027] When packaging, sterile operation is performed throughout the process. The expansion piece 4 is pressed back into the through hole 5. Then, the card 8 of the cartridge 2 is used to make the card strip 9 follow the guide groove 10 in the fixed nail sheath 3, so that the lower end of the card 8 is embedded in the card groove 7 above the card block 6, and the card teeth 16 of the expansion piece 4 shall not protrude from the outer surface of the expandable nail sheath 1. Then, the cartridge 2, the expandable nail sheath 1 and the fixing screw 3 are placed in a sterile packaging bag and packaged. When using, the expandable nail sheath 1 and the cartridge 2 are first taken out of the sterile packaging bag, and the exposed part of the cartridge 2 is held throughout the process. The expandable nail sheath 1 is moved into the position where the expandable nail sheath 1 is to be implanted. Since the expandable nail sheath 1 is first in a smooth outer surface, the damage to the surgical site is reduced. Then the card 8 of the cartridge 2 is pinched inwards, and the cartridge 2 is moved out of the expandable nail sheath 1. The expandable piece 1 4 will bounce outwards, and the expandable nail sheath 1 will be fixed in the surgical site to a certain extent. Then, the fixing screw 3 is tightened downward along the through hole 18 in the expandable nail sheath 1 with a tool for tightening through the groove 12 and the tool head hole 15. In this process, first The fixing screw 3 is screwed to the internal thread 14 of the clamping block 6, and the screw is continued to be screwed. The fixing screw 3 will squeeze the clamping block 6 outward, and the expansion piece 14 will continue to be squeezed outward. The clamping teeth 16 will have a stronger fixing effect on the surgical site, and then the fixing screw 3 is continued to be screwed in the through hole 2 18, so that the expansion piece 2 19 has space to start bulging outward, and is tightly fixed to the surgical site through the expansion piece 1 4 and the expansion piece 2 5. The existence of the through hole 2 18 is to facilitate the blood and the like in the operation to flow therein, and will not accumulate in a certain part to affect the surgical effect, and then several expansion pieces 19 can be opened. The nail sheath 1 together with the cartridge 2 and the fixing screw 3 are repeatedly operated to form a straight line, and then a long rod is used to pass through the U-shaped groove 13 to connect several fixing screws 3, and finally a short tail nail is inserted into the groove 12 on the extension head 11 through the internal thread 17 to fix the long rod, and the vertebral body is reset to the correct position with these, and the nail sheath 1 can be stretched open. Even if the fixing screw 3 does not reach the appropriate depth or there are other problems, the fixing screw 3 can be adjusted, so that the vertebral body will not be injured, thereby achieving the purpose of reducing the damage to the vertebrae caused by repeated operations.

Claims

1. A nail sheath fixation device for vertebral body slippage reduction, characterized in that: The invention comprises an expandable nail sheath (1), a cartridge (2) and a fixing screw (3), wherein the cartridge (2) is placed in the expandable nail sheath (1), the cartridge (2) is clamped with the expandable nail sheath (1), the fixing screw (3) is placed in the expandable nail sheath (1), the fixing screw (3) is threadedly connected with the expandable nail sheath (1), an extension head (11) is provided on the upper end surface of the fixing screw (3), the lower end surface of the extension head (11) is fixedly connected with the fixing screw (3), and the fixing screw (3) is fixedly connected with the fixing screw (3). The extension head (11) is provided with a groove (12) and a U-shaped groove (13), the groove (12) being disposed on the upper end surface of the extension head (11), the groove (12) being provided with an internal thread (14) and a tool head hole (15), two U-shaped grooves (13) being disposed on two sides of the extension head (11), the two U-shaped grooves (13) corresponding to each other, the U-shaped groove (13) being connected to the groove (12), and the tool head hole (15) being disposed on the bottom surface of the groove (12).

2. A nail sheath fixation device for vertebral body slippage reduction according to claim 1, characterized in that: The expandable nail sheath (1) is provided with an expandable piece (4) and a through hole (5). There are a plurality of through holes (5) which are uniformly arranged around the expandable nail sheath (1) with the expandable nail sheath (1) as the center. The expandable piece (4) is placed in the through hole (5). The lower end surface of the expandable piece (4) is fixedly connected to the lower bottom surface in the through hole (5). The expandable piece (4) and the expandable nail sheath (1) are integrally formed. The clamping cylinder (2) is respectively clamped with the expandable nail sheath (1) and the expandable piece (4). The fixing screw (3) is respectively threadedly connected with the expandable nail sheath (1) and the expandable piece (4). A clamping block (6) is provided on the inner side surface of the expandable nail sheath (4). The clamping block (6) is fixedly connected to the inner side surface of the expandable nail sheath (4).

3. A nail sheath fixation device for vertebral body slippage reduction according to claim 2, characterized in that: The upper end surface of the clamping block (6) is provided with a clamping slot (7), and the lower end surface of the clamping cylinder (2) is provided with a plurality of clamping cards (8). The upper end surface of the clamping card (8) is fixedly connected to the lower end surface of the clamping cylinder (2). The clamping card (8) corresponds to the clamping slot (7). The clamping card (8) is clamped with the expansion piece 1 (4) through the clamping slot (7). The clamping cylinder (2) is clamped with the expandable nail sheath (1) through the clamping card (8). The fixing screw (3) is fixed to the clamping block (6). ) is threadedly connected, a clamping strip (9) is provided on the outer surface of the card (8), the clamping strip (9) and the card (8) are integrally formed, a guide groove (10) is provided on the inner wall of the expandable nail sheath (1), the guide groove (10) corresponds to the clamping strip (9) one by one, the side wall of the guide groove (10) contacts the side wall of the clamping strip (9), and the card (8) is clamped with the expandable nail sheath (1) through the cooperation of the clamping strip (9) and the guide groove (10).

4. The nail sheath fixing device for vertebral body slippage reduction according to claim 2, characterized in that: The first expansion piece (4) is provided with a latching tooth (16), and the latching tooth (16) is in a plurality and evenly distributed on the outer side of the first expansion piece (4). The latching tooth (16) and the first expansion piece (4) are integrally formed. The cross-sectional shape of the clamping block (6) is trapezoidal, and the oblique side of the trapezoidal cross-section of the clamping block (6) is upward and the short side is inward. The inner side surface of the expandable nail sheath (1) and the short side of the trapezoidal cross-section of the clamping block (6) are both provided with a second internal thread (17), and the fixing screw (3) is threadedly connected to the clamping block (6) and the expandable nail sheath (1) respectively through the second internal thread (17).

5. The nail sheath fixation device for vertebral body slippage reduction according to claim 1, characterized in that: The lower end surface of the expandable nail sheath (1) is provided with a second through hole (18), and the lower end surface of the expandable nail sheath (1) is provided with a second expansion piece (19). There are a plurality of the second expansion pieces (19) which are evenly distributed around the second through hole (18), and the second expansion piece (19) and the expandable nail sheath (1) are integrally formed.

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