Top end one-way adjusting type elastic outer fixing support fixing arm

Abstract

The utility model discloses a top end one-way adjusting type elastic external fixing support fixing arm, an external fixing support comprises an adjusting rod, a stress guide rod, a sliding fit thread sleeve, an elastic device, a fixing rod and a fixing structure for fixing the adjusting rod, the external fixing support further comprises an adjusting device, and the adjusting device pushes the stress guide rod to move in the axial direction of the stress guide rod. The stress guide rod is located in the adjusting rod, one end of the adjusting rod is in sliding connection with the sliding-fit threaded sleeve, the other end of the adjusting rod is provided with an adjusting device in threaded connection with the adjusting rod, and the sliding-fit threaded sleeve is arranged at one end of the fixing rod in a sleeving mode. When a fractured bone is subjected to axial stress, the bone fracture healing device can stimulate generation of callus at a fractured end, avoid osteoporosis caused by stress shielding of the external fixing frame, accelerate fracture healing, increase the strength of healing sclerotin and effectively prevent delayed healing or non-healing of the fracture.

Description

Technical Field

[0001] The utility model relates to an external fixation bracket device for clinical application in orthopedics, in particular to a top unidirectional adjustable elastic external fixation bracket fixing arm. Background Art

[0002] The inventor applied for a utility model patent with application number CN201410064432.9 on February 20, 2014, and its name is a utility model patent for an elastic device of an external fixator. The invention is divided into three combination forms: single-arm type, semi-ring type, and ring type. The fixing clamp block is divided into a bar-needle clamp block and a bar-rod clamp block. The pressure-adjusting fixed arm is composed of an adjusting shaft, a sliding screw sleeve, an elastic device, a connecting nut, a tightening screw sleeve, a fixing rod, etc. The sliding screw sleeve is radially provided with a limit pin, a limit top screw, a pressure-adjusting pin, an outer ring, an inner ring, a pressure-adjusting nut, and a pressure-adjusting pin hole. The adjusting shaft and the sliding screw sleeve are slidably matched, the connecting nut is threadedly connected with the sliding screw sleeve and the tightening screw sleeve, the tightening screw sleeve is relatively fixedly matched with the clamping pin, and the elastic device is composed of a spring or an elastic capsule, a pressure sensor, a sliding base, a pressure sensor connecting device, and a pressure display, and can be set to be with a pressure gauge or without a pressure gauge. Compared with general external fixators, the elastic external fixator with adjustable pressure can conduct stress axially, generate stress at the fracture end, avoid stress shielding, and prevent the occurrence of delayed healing and non-union of fractures. However, the device still has the following shortcomings: the pressure regulating device is arranged on the sliding screw sleeve, which increases the length of the sliding screw sleeve, and correspondingly increases the spacing between the bone screws or Steinmann pins fixed to the fixing rod and the adjusting rod by the rod pin clamp, which is not conducive to the placement of the bone screws or Steinmann pins in the normal position of the fracture end, and is not conducive to the stable fixation of the fixed bone. Sometimes other fixing components need to be added to achieve the implantation of the bone screws or Steinmann pins in the normal position, and further technical improvements are needed. Utility Model Content

[0003] The purpose of the utility model is to make up for the defects of the current use of external fixators to treat fractures, and to provide a combined external fixator and an adjustable pressure fixing arm with simple operation, easy adjustment, and convenient nail placement, which can effectively prevent stress shielding, avoid osteoporosis, stimulate the formation of callus at the fracture end, and accelerate fracture healing.

[0004] The utility model adopts the following technical solutions:

[0005] A top unidirectional adjustable elastic external fixing bracket fixing arm, the external fixing bracket fixing arm comprises an adjusting rod, a stress guide rod, a sliding screw sleeve, an elastic device, a fixing rod and a fixing structure for fixing the adjusting rod, characterized in that: the external fixing bracket fixing arm also includes an adjusting device, the adjusting device pushes the stress guide rod to move along its axial direction, the stress guide rod is located in the adjusting rod, one end sleeve of the adjusting rod is slidably connected with the sliding screw sleeve, the other end of the adjusting rod is provided with an adjusting device threadedly connected thereto, and the sliding screw sleeve is sleeved on the outside of one end of the fixing rod; wherein,

[0006] The adjusting rod can be slightly adjusted in the axial direction relative to the sliding screw sleeve, but cannot rotate relative to it;

[0007] The stress guide rod is slidably connected relative to the adjustment rod;

[0008] The elastic device provides elastic stress during the process of fine-tuning the stress guide rod in the axial direction up and down;

[0009] The fixing structure of the sliding screw sleeve is used to fix the adjusting rod and limit the axial movement of the adjusting rod.

[0010] Furthermore, the adjusting device is one of the following:

[0011] a. The adjusting device is of the adjusting nut type, including an adjusting nut and a graduated rod. The adjusting nut is threadedly connected to the adjusting rod, a step is arranged at the tail, the top of the stress guide rod abuts against the step of the adjusting nut, the graduated rod is tightly connected to the stress guide rod, and is slidably connected to the tail of the adjusting nut, and a pressure scale is arranged on the side wall;

[0012] b. The adjusting device is of adjusting bolt type, including adjusting bolt, scale sleeve, and support spring. The scale sleeve is sleeved outside the adjusting bolt and adjusting rod, and a step is arranged at the tail end. The scale sleeve, adjusting bolt, and adjusting rod are slidingly connected. A support spring is arranged between the tail end of the adjusting rod and the tail end of the scale sleeve, and a pressure scale is arranged on the outer wall of the adjusting rod.

[0013] Further, the fixing structure of the sliding screw sleeve is one of the following methods:

[0014] a. Anti-rotation pins and upper fastening screws are radially arranged on the upper part of the sliding screw sleeve. The anti-rotation pins are adapted to the anti-rotation pin holes arranged on the lower part of the adjusting rod. The axial length of the anti-rotation pin holes is greater than the lateral length to prevent the adjusting rod from rotating in the horizontal direction. After the upper fastening screws are screwed in, they abut against the fixed circular holes arranged on the outer wall of the adjusting rod to prevent the adjusting rod from moving up and down relative to the sliding screw sleeve.

[0015] b. An anti-rotation pin is radially arranged on the upper part of the sliding screw sleeve, which is adapted to the anti-rotation pin hole arranged on the lower part of the adjusting rod to prevent the adjusting rod from rotating horizontally. A fastening screw sleeve is arranged at the top end of the upper part of the sliding screw sleeve, and the fastening screw sleeve is threadedly connected to the outer wall of the adjusting rod. The fastening screw sleeve is screwed down and abuts against the top end of the upper part of the sliding screw sleeve to prevent the adjusting rod from moving up and down relative to the sliding screw sleeve.

[0016] Furthermore, the specific connection method of the sliding screw sleeve and the fixing rod is one of the following methods:

[0017] (a) A fixed screw sleeve is provided on the outer wall of the lower part of the sliding screw sleeve, which is connected to the sliding screw sleeve by a thread. A fastening screw sleeve is sleeved on the fixing rod, and the open end of the fastening screw sleeve is located outside the fixing screw sleeve. A lower fastening screw is radially provided on the fixing screw sleeve. After the lower fastening screw is screwed in, it abuts against a step provided on the outer wall of the fixing rod to prevent the fixing rod from moving relative to the sliding screw sleeve; the fixing rod is slidably matched with the lower part of the sliding screw sleeve and the fastening screw sleeve. Two radially penetrating pin holes are provided at different axial heights of the fixing rod, and clamping pins are respectively installed. After the clamping pin radially penetrates the pin hole of the fixing rod, it is respectively located at the upper and lower steps of the fastening screw sleeve, and can drive the fixing rod to move up and down as the fastening screw sleeve moves up and down;

[0018] (b) A fixing nut is arranged on the outer wall of the lower part of the sliding screw sleeve, which is fastened to the sliding screw sleeve by a fixing pin. A fastening screw is radially arranged on the side wall of the fixing nut to fix the fixing rod. Two radially penetrating pin holes are arranged at different axial heights of the fixing rod. Two clamping pins radially penetrate the fixing rod and are respectively located at the upper and lower steps of the fastening screw sleeve.

[0019] (c) A cylindrical thickened wall portion is provided on the outer wall of the lower part of the slip-on screw sleeve, and a boss is provided inside. The elastic device is located on the boss. A fastening screw is radially provided on the slip-on screw sleeve. The fastening screw is threadedly connected to the lower part of the slip-on screw sleeve, and its head end corresponds to the step provided on the side surface of the upper end of the fixing rod to fix the fixing rod; the fixing rod is configured to be slidably matched with the lower part of the slip-on screw sleeve and the lower part of the fastening screw sleeve. Two radially penetrating pin holes are provided at different axial heights of the fixing rod, and clamping pins are respectively installed thereon. After the clamping pin radially penetrates the pin hole of the fixing rod, it is respectively matched with the upper and lower steps of the fastening screw sleeve and the lower end of the fastening nut, and can drive the fixing rod to move up and down as the fastening screw sleeve moves up and down;

[0020] (d) A gasket, a fixing rod screw, and a fixing rod screw sliding hole are arranged on the outer wall of the lower part of the sliding screw sleeve. A circular hole is arranged radially on the gasket. The fixing rod screw radially crosses the circular hole of the gasket. The head end of the fixing rod screw is threadedly connected with the upper part of the fixing rod. The axial diameter of the fixing rod screw sliding hole is greater than the transverse diameter. The fixing rod is arranged to slide with the lower part of the sliding screw sleeve and the lower part of the fastening screw sleeve. Two radially penetrating pin holes are arranged at different axial heights of the fixing rod, and clamping pipe pins are respectively installed. After the clamping pipe pin radially penetrates the pin hole of the fixing rod, it is respectively matched with the upper and lower steps of the fastening screw sleeve and the lower end of the fastening screw sleeve, and can drive the fixing rod to move up and down as the fastening screw sleeve moves up and down;

[0021] (e) A gasket, a fixing rod screw, a fixing rod screw sliding hole, and an adjusting nut are arranged on the outer wall of the lower part of the sliding screw sleeve. A circular hole is arranged radially on the gasket. The fixing rod screw radially crosses the circular hole of the gasket. The head end of the fixing rod screw is threadedly connected with the upper part of the fixing rod. The axial diameter of the fixing rod screw sliding hole is greater than the transverse diameter. The adjusting nut is threadedly connected with the lower part of the sliding screw sleeve and is arranged below the gasket. The fixing rod is arranged to slide with the lower part of the sliding screw sleeve, and a screw hole adapted to the fixing rod screw is arranged radially on the upper end.

[0022] (f) An upper adjusting nut and a lower adjusting nut are arranged on the outer wall of the lower part of the sliding screw sleeve, and a fixing rod pin sliding hole is arranged radially on both sides, the axial length of the fixing rod pin sliding hole is greater than the lateral width, the fixing rod is arranged to slide with the lower part of the sliding screw sleeve, and a fixing rod pin is arranged radially on the upper end, and two adjusting nuts are respectively located above and below the fixing rod pin, and are threadedly connected with the lower part of the sliding screw sleeve, so as to drive the fixing rod pin and the fixing rod to move up and down;

[0023] (g) The lower part of the sliding nut is fastened to the upper part of the fixing rod by a pin.

[0024] Furthermore, the specific structure of the elastic device is one of the following:

[0025] (a) The elastic device includes a spring, which is placed in the sliding screw sleeve. A radial limit pin 1 is provided on the sliding screw sleeve. The spring is provided with a spring base, which is placed between the limit pin 1 and the spring base. The spring is supported by the limit pin 1. The spring base abuts against one end of the stress guide rod. An annular upper fixing sleeve is provided outside the limit pin 1 and the sliding screw sleeve. Both sides of the limit pin 1 are located in the limit pin fixing holes provided on the upper fixing sleeve.

[0026] (b) The elastic device includes a spring, which is placed outside the sliding screw sleeve. The lower part of the sliding screw sleeve is provided with a limit hole and a slide groove which penetrate radially on both sides. A limit pin 1 is arranged in the limit hole. The limit pin 1 radially penetrates the limit hole of the sliding screw sleeve. Below the limit pin 1, an adjusting nut is sleeved on the outer wall of the lower part of the sliding screw sleeve. A limit pin 2 is arranged in the slide groove. The limit pin 2 can slide up and down in the slide groove. An annular upper fixing sleeve and a lower fixing sleeve are arranged at both ends of the limit pin 1 and the limit pin 2, respectively. The two ends of the limit pin 1 and the limit pin 2 are located in the limit pin holes arranged on the upper fixing sleeve and the lower fixing sleeve;

[0027] (c) The elastic device includes an elastic balloon, which is provided with a balloon base. The sliding screw sleeves on both sides of the elastic balloon are respectively provided with radially penetrating limit holes and sliding grooves, and limit pins are arranged in the limit holes. The limit pins radially penetrate the limit holes of the sliding screw sleeves, and the limit pins are arranged in the sliding grooves. The limit pins can slide up and down in the sliding grooves; an annular upper fixing sleeve and a lower fixing sleeve are respectively arranged at both ends of the limit pins 1 and 2, and the ends of the limit pins 1 and 2 are located in the limit pin holes arranged on the upper fixing sleeve and the lower fixing sleeve;

[0028] (d) The elastic device includes a spring, which is placed above the stress guide rod and inside the adjusting rod. The adjusting device adjusts the force of the spring, thereby giving stress to the stress guide rod and the sliding screw sleeve, and the sliding screw sleeve then gives a reaction force to the stress guide rod, the spring, the adjusting screw sleeve or the adjusting bolt, and the adjusting rod;

[0029] (e) The stress guide rod is provided with two sections, the upper and lower sections, the elastic device is provided between the upper and lower stress guide rods, the elastic device comprises a spring, the elastic device adjusts the force of the spring, thereby imparting stress to the stress guide rod and the sliding screw sleeve, and the sliding screw sleeve further imparts a reaction force to the stress guide rod, the spring, the adjusting screw sleeve or the adjusting bolt, and the adjusting rod;

[0030] (f) The elastic device includes a spring, which is placed in the sliding screw sleeve. The sliding screw sleeve is provided with radial limit pin 1 and limit pin 2, and the spring is placed between limit pin 1 and limit pin 2. The sliding screw sleeve is provided with limit pin hole 1 and limit pin hole 2 respectively matching with limit pin 1 and limit pin 2, and the axial diameter thereof is greater than the transverse diameter. An annular upper fixing sleeve and a lower fixing sleeve are provided outside the limit pin 1 and the limit pin 2, and both sides of the limit pin 1 and the limit pin 2 are located in the limit pin fixing holes provided on the upper fixing sleeve and the lower fixing sleeve; the stress guide rod is located in the fixed rod and is slidably connected to the fixed rod, one end of the stress guide rod abuts against the limit pin 2, and the other end abuts against the adjusting screw sleeve or the adjusting bolt provided at the tail end of the fixed rod.

[0031] Furthermore, the external fixing bracket also includes a pressure display device provided with an elastic device, the pressure display device is composed of a pressure sensor, a connecting line, and a pressure gauge, and the position of the pressure sensor is one of the following positions;

[0032] (a) The pressure sensor is arranged between the end of the stress guide rod and the step at the tail of the adjusting nut. A connecting wire hole is arranged at the tail of the adjusting nut. The connecting wire passes through the connecting wire hole and is connected to the pressure gauge.

[0033] (b) The pressure sensor is arranged between the limit pin 1 and the spring, inside the sliding screw sleeve, and is slidably connected to the sliding screw sleeve. A connecting wire hole is arranged on the side wall of the sliding screw sleeve, and the connecting wire passes through the connecting wire hole and is connected to the pressure gauge;

[0034] (c) The pressure sensor is arranged between the spring base and the lower end of the stress guide rod, in the sliding screw sleeve, and is slidably connected to the sliding screw sleeve. A connecting wire hole is arranged on the side wall of the sliding screw sleeve, and the connecting wire passes through the connecting wire hole and is connected to the pressure gauge;

[0035] (d) The pressure sensor is arranged between the adjusting bolt and the upper end of the stress guide rod, inside the adjusting rod, and is slidably connected to the adjusting rod. A connecting wire hole is arranged in the axial direction of the adjusting bolt, and the connecting wire passes through the connecting wire hole and is connected to the pressure gauge;

[0036] (e) The pressure sensor is arranged between the balloon base and the limit pin 1, inside the sliding screw sleeve, and is slidably connected to the sliding screw sleeve. A connecting wire hole is arranged on the side wall of the sliding screw sleeve, and the connecting wire passes through the connecting wire hole and is connected to the pressure gauge.

[0037] Furthermore, the stress guide rod and the fixing rod are either a cylindrical rod with a hollow structure or a cylindrical rod with a solid structure.

[0038] In summary, the combined external fixator with adjustable pressure of the utility model is used to fix fractures. When the limit top screw is screwed out or the fastening screw sleeve is screwed up, the fractured bone is under axial pressure, and the adjusting rod is prompted to move downward and pressurize through the fixing screws, bone pins and the upper and lower ends of the fixing arms of the external fixator on the bone, thereby driving and controlling the fractured bone to also transmit stress. Under the action of the stress at the fracture end, the formation of callus at the fracture end can be stimulated to avoid stress shielding at the fracture end. When the adjusting nut and the adjusting bolt are screwed in, a downward force can be given to the adjusting rod, the spring base, the spring or elastic balloon, the balloon base, the limit pin and the sliding screw sleeve, and then an upward force is given to the adjusting rod, the pressure sensor, the adjusting nut, the adjusting bolt and the adjusting rod through the spring or elastic balloon. The upward force can be read through the pressure scale and the pressure gauge, and the downward force is the human body gravity, and then the stress at the fracture end can be calculated, and the stress at the fracture end can be accurately controlled through adjustment. For comminuted fractures, the axial stress in the early stage of fracture healing can easily cause the fracture fragments to shift. It is necessary to screw in the limit screw to limit the downward movement of the stress guide rod. The fracture ends will not produce micro-motion and stress. When the fracture fragments are healed to the point where they are not easy to shift, the limit screw can be screwed out. When the fractured bones are subjected to axial stress, it can stimulate the formation of callus at the fracture ends, avoid the stress shielding of the external fixator to form osteoporosis, accelerate the fracture healing speed, increase the strength of the healing bone, and effectively prevent the occurrence of delayed healing or non-healing of fractures. The use of the top unidirectional adjustable elastic external fixator fixed arm has the advantages of simple operation, easy adjustment, and convenient nail placement. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the structure of the first embodiment of the utility model;

[0040] Figure 2 This is a schematic diagram of the structure of the second embodiment of the present utility model;

[0041] Figure 3 This is a schematic diagram of the first structural form of the third embodiment of the present utility model;

[0042] Figure 4 This is a schematic diagram of the second structural form of the third embodiment of the utility model;

[0043] Figure 5 This is a schematic diagram of the third structural form of the third embodiment of the present utility model;

[0044] Figure 6 This is a schematic diagram of the structure of the fourth embodiment of the present utility model;

[0045] Figure 7 This is a schematic diagram of the structure of Embodiment 5 of the present utility model;

[0046] Figure 8 This is a schematic diagram of the structure of the sixth embodiment of the utility model;

[0047] Fig. 9 This is a structural diagram of Embodiment 7 of the present utility model;

[0048] Fig.10 This is a schematic diagram of the structure of Embodiment 8 of the present utility model;

[0049] Fig.11 This is a schematic diagram of the structure of Embodiment 9 of the present utility model;

[0050] Fig.12 This is a schematic diagram of the structure of the tenth embodiment of the utility model;

[0051] Fig.13 This is a schematic diagram of the structure of the eleventh embodiment of the present utility model;

[0052] Fig.14 This is a schematic diagram of the structure of the twelfth embodiment of the present utility model;

[0053] Fig.15 This is a schematic diagram of the structure of Embodiment 13 of the present utility model;

[0054] Fig.16 This is a schematic diagram of the structure of Embodiment 14 of the present utility model;

[0055] Fig.17 This is a schematic diagram of the structure of the fifteenth embodiment of the utility model;

[0056] In the figure, 1. adjusting nut, 2. stress guide rod, 3. adjusting rod, 4. sliding screw sleeve, 5. spring base, 6. spring, 7. limit pin 1, 8. fixing screw sleeve, 9. fixing rod, 10. fastening screw sleeve, 11. clamping pin 1, 12. clamping pin 2, 13. upper fastening top screw, 14. anti-rotation pin, 15. upper fixing sleeve, 16. lower fastening top screw, 17. anti-rotation pin hole, 18. adjusting bolt, 19. scale sleeve , 20. Slide groove, 21. Limit pin 2, 22. Lower fixing sleeve, 23. Boss, 24. Fastening screw sleeve, 25. Elastic balloon, 26. Balloon base, 27. Fixing pin, 28. Fixing screw sleeve, 29. Washer, 30. Fixing rod screw, 31. Adjusting nut, 32. Fixing rod pin, 33. Upper adjusting nut, 34. Lower adjusting nut, 35. Scale rod, 36. Pressure sensor, 37. Connecting line, 38. Pressure gauge. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the specification. It is obvious that the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0058] Embodiment 1, as shown in FIG1 , is a top one-way adjustable elastic external fixation bracket fixing arm, the top one-way adjustable elastic external fixation bracket fixing arm comprises: an adjusting rod 3, a stress guide rod 2, a sliding screw sleeve 4, an elastic device, an adjusting device, a fixing rod 9, a fixing rod 9 and a fixing structure for fixing the adjusting rod 3.

[0059] The adjusting device can push the stress guide rod 2 to move along its axial direction. The specific structure is: it includes an adjusting nut 1 and a scale rod 35. The adjusting nut 1 is threadedly connected to the external thread of the adjusting rod 3, and a step is arranged at the tail. The top of the stress guide rod 2 abuts against the step of the adjusting nut 1; the adjusting nut 1 is threadedly connected to the adjusting rod 3, the scale rod 35 is tightly connected to the stress guide rod 2, and is slidably connected to the tail of the adjusting nut 1, and a pressure scale is arranged on its side wall.

[0060] The stress guide rod 2 can be slightly adjusted in the axial direction relative to the sliding screw sleeve 4, but cannot rotate relatively; the fixed rod 9 is slidably connected to the sliding screw sleeve 4, specifically: a fixed screw sleeve 8 is provided on the outer wall of the lower part of the sliding screw sleeve 4, and is threadedly connected to the sliding screw sleeve 4, and a fastening screw sleeve 10 is sleeved on the fixed rod 9 and is slidably connected to it. The upper end of the fastening screw sleeve 10 is sleeved on the outside of the lower end of the fixed screw sleeve 8 and is threadedly connected. A lower fastening top screw 16 is radially arranged on the fixed screw sleeve 8. After the lower fastening top screw 16 is screwed in It rests against the outer wall of the fixing rod 9 to prevent the fixing rod 9 from moving relative to the sliding screw sleeve 4; the fixing rod 9 is slidably matched with the lower part of the sliding screw sleeve 4 and the lower part of the fastening screw sleeve 10, and two radially penetrating pin holes are arranged at different axial heights of the fixing rod 9, which are respectively arranged at the upper and lower steps of the fastening screw sleeve 10, and a clamping pipe pin 11 and a clamping pipe pin 2 12 are respectively installed therein, and the two clamping pipe pins radially penetrate the pin holes of the fixing rod 9, and can drive the fixing rod 9 to move up and down as the fastening screw sleeve 10 moves up and down.

[0061] The elastic device provides elastic force during the axial up and down micro-adjustment process of the stress guide rod 2. The elastic device consists of a spring base 5 and a spring 6. A radial limit pin 7 is arranged on the sliding screw sleeve 4. The spring 6 is supported by the limit pin 7. The spring 6 is placed between the limit pin 7 and the stress guide rod 2. A spring base 5 is arranged between the stress guide rod 2 and the spring 6. An annular upper fixing sleeve 15 is arranged outside the limit pin 7 and the sliding screw sleeve 4. Both sides of the limit pin 7 are located in the limit pin holes arranged on the upper fixing sleeve 15.

[0062] In this embodiment, the adjusting device comprises an adjusting nut 1 , which is threadedly connected to an adjusting rod 3 , and the top end of the stress guide rod 2 abuts against a step of the adjusting nut 1 .

[0063] The fixing structure of the sliding screw sleeve 4 is used to fix the adjusting rod 3 and limit the rotation of the adjusting rod 3, specifically: a thickened portion is provided on the upper portion of the sliding screw sleeve 4, and an anti-rotation pin 14 and an upper fastening top screw 13 are provided in the radial direction of the thickened portion, the anti-rotation pin 14 is adapted to the anti-rotation pin hole 17 provided at the lower portion of the adjusting rod 3, the axial diameter of the anti-rotation pin hole 17 is greater than the lateral diameter, the anti-rotation pin 14 can move up and down along the anti-rotation pin hole 17 to prevent the adjusting rod 3 from rotating in the horizontal direction, and the upper fastening top screw 13 is screwed in and abuts against the outer wall of the adjusting rod 3 to prevent the adjusting rod 3 from rotating in the horizontal direction and moving up and down relative to the sliding screw sleeve 4; the thickness of the wall of one side of the sliding screw sleeve 4 where the anti-rotation pin 14 and the upper fastening top screw 13 are provided is increased, which is convenient for setting the anti-rotation pin 14 and the upper fastening top screw 13.

[0064] Embodiment 2, as shown in Figure 2, the difference between this embodiment and embodiment 1 lies in the fixing structure of the sliding screw sleeve 4. The fixing structure of this embodiment is as follows: an anti-rotation pin 14 is radially arranged on the upper part of the sliding screw sleeve 4, which is adapted to the anti-rotation pin hole 17 arranged on the lower part of the adjusting rod 3 to prevent the adjusting rod 3 from rotating in the horizontal direction, and a fastening screw sleeve 24 is arranged on the upper part of the top end of the sliding screw sleeve 4 and the outer wall of the adjusting rod 3, and the fastening screw sleeve 24 is threadedly connected to the adjusting rod 3.

[0065] Embodiment 3, as shown in FIG. 3, the difference between this embodiment and embodiment 1 lies in the difference in the adjusting device. In this embodiment, the adjusting device includes an adjusting bolt 18 and a graduated sleeve 19. One end of the graduated sleeve 19 is open, and the open end is located outside the adjusting rod 3. The other end is provided with an adjusting bolt hole. The graduated sleeve 19 is sleeved on the adjusting bolt 18, and the adjusting bolt 18 is threadedly connected with the internal thread on the upper end of the adjusting rod 3. Figure 4 As shown, the present application can also arrange the spring 6 between the adjusting bolt 18 and the stress guide rod 2, such as Figure 5 As shown, the stress guide rod 2 can also be arranged into an upper part and a lower part, and the spring 6 is arranged between the upper part and the lower part of the stress guide rod 2.

[0066] Embodiment 4, as shown in Figure 6, the difference between this embodiment and embodiment 1 lies in the difference in the elastic device, the elastic device includes a spring 6, the spring 6 is arranged outside the sliding screw sleeve 4, the sliding screw sleeve 4 at the upper and lower ends of the spring 6 is provided with radially through-going limit holes, the limit pin 1 7 and the limit pin 2 21 are respectively passed through the limit holes, the limit pin 1 7 and the limit pin 2 21 are respectively provided with an annular upper fixing sleeve 15 and a lower fixing sleeve 22 outside, the two ends of the limit pin are located in the limit holes provided on the upper fixing sleeve 15 and the lower fixing sleeve 22; the axial diameter of the limit pin hole corresponding to the limit pin 1 7 is greater than the lateral diameter, so that the stress guide rod 2 can be slightly moved downward relative to the sliding screw sleeve 4 under the action of the axial force.

[0067] Embodiment 5, as shown in Figure 7, the difference between this embodiment and embodiment 1 lies in the difference in the elastic device. In this embodiment, the elastic device includes an elastic balloon 25 and a balloon base 26. The elastic balloon 25 and the balloon base 26 are placed between the limit pin 1 7 and the limit pin 21. The elastic balloon 25 is located on the balloon base 26. The sliding screw sleeves 4 at both ends of the elastic balloon 25 are provided with radially through limit holes. The limit pin 1 7 and the limit pin 21 are respectively passed through the limit holes. The axial diameter of the limit pin hole corresponding to the limit pin 1 7 is greater than the lateral diameter. The limit pin 1 7 and the limit pin 21 are respectively provided with an annular upper fixing sleeve 15 at both ends. The two ends of the limit pin are located at the upper fixing sleeve 15. The stress guide rod 2 in the limit hole provided on the lower fixing sleeve 22 can be slightly moved downward relative to the sliding screw sleeve 4 under the action of the axial force.

[0068] Embodiment 6, as shown in Figure 8, the difference between this embodiment and embodiment 4 is that the adjustment device is at the bottom and is set to lower end adjustment, specifically: the inner diameter of the sliding screw sleeve 4 is adapted to the outer diameter of the fixed rod 9, and a fastening screw sleeve 10 is mounted on the fixed rod 9. The upper open end of the fastening screw sleeve 10 is located outside the fixed screw sleeve 8, and the fixed screw sleeve 8 is radially provided with a lower fastening top screw 16. After the lower fastening top screw 16 is screwed in, it abuts against the outer wall of the fixed rod 9 to prevent the fixed rod 9 from moving relative to the sliding screw sleeve 4; the fixed rod 9 is configured to slide with the lower part of the sliding screw sleeve 4 and the lower part of the fastening screw sleeve 10, and two radially through pin holes are set at different axial heights of the fixed rod 9, in which a clamping pipe pin 11 and a clamping pipe pin 2 12 are respectively installed, which are respectively located at the upper and lower steps of the fastening screw sleeve 10, and the two clamping pipe pins radially penetrate the pin holes of the fixed rod 9, and can drive the fixed rod 9 to move up and down as the fastening screw sleeve 10 moves up and down.

[0069] The elastic device includes a spring 6, which is arranged outside the sliding screw sleeve 4. The sliding screw sleeves 4 at the upper and lower ends of the spring 6 are provided with radially penetrating limit holes, and the limit pin 1 7 and the limit pin 2 21 are respectively penetrated in the limit holes. The limit pin 1 7 and the limit pin 2 21 are respectively provided with an annular upper fixing sleeve 15 and a lower fixing sleeve 22. The two ends of the limit pin are located in the limit holes provided on the upper fixing sleeve 15 and the lower fixing sleeve 22; the axis of the limit pin hole corresponding to the limit pin 1 7 and the limit pin 2 21 The radial length is greater than the transverse diameter length, the upper end of the limit pin 21 abuts against the lower end of the adjusting rod 3, the stress guide rod 2 is located in the fixed rod 9, and the specific structure of the adjusting device is: it includes an adjusting nut 1, a scale rod 35, and a step is arranged at the tail of the adjusting nut 1 which is threadedly connected to the external thread of the fixed rod 9, the lower end of the stress guide rod 2 abuts against the step of the adjusting nut 1, and the upper end abuts against the limit pin 7; the adjusting nut 1 is threadedly connected to the fixed rod 9, the scale rod 35 and the stress guide rod 2 are tightly connected, and are slidably connected to the tail of the adjusting nut 1.

[0070] Embodiment 7, as shown in Figure 9, the difference between this embodiment and embodiment 6 is that the elastic device is composed of a spring base 5 and a spring 6, the spring 6 is located in the sliding screw sleeve 4, and a radial limit pin 7 and a limit pin 21 are provided on the sliding screw sleeve 4. The spring base 5 and the spring 6 are supported by the limit pin 7, and the spring base 5 is placed between the limit pin 7 and the spring 6. The upper end of the spring 6 abuts against the limit pin 21, and the lower end of the adjusting rod 3 abuts against the limit pin 21. Pin 21 and the sliding screw sleeve 4 are provided with a radially through-going limit hole, and the limit pin 1 7 and the limit pin 2 21 are respectively inserted into the limit holes, and the limit pin 1 7 and the limit pin 2 21 are respectively provided with an annular upper fixing sleeve 15 and a lower fixing sleeve 22 outside, and the two ends of the limit pin are located in the limit holes provided on the upper fixing sleeve 15 and the lower fixing sleeve 22; the axial diameter of the limit pin hole corresponding to the limit pin 1 7 and the limit pin 2 21 is greater than the lateral diameter.

[0071] Embodiment eight, as Fig.10 As shown, a fixing nut 28 is provided on the lower outer wall of the sliding screw sleeve 4, and is fastened to the sliding screw sleeve 4 by a fixing pin 27. A fastening screw 16 is radially provided on the side wall of the fixing nut 28 to fix the fixing rod 9; two radially through pin holes are provided at different axial heights of the fixing rod 9, and two clamping pins radially penetrate the fixing rod 9 and are respectively located at the upper and lower steps of the fastening screw sleeve 10.

[0072] Embodiment 9, as Fig.11 The present embodiment differs from the first embodiment in two points: the first difference is that a thickened portion is provided at the lower part of the sliding screw sleeve 4, the thickened portion is located above the fastening screw sleeve 10, and a fastening screw 16 threadedly connected to the thickened portion of the sliding screw sleeve 4 is radially provided; the second difference is that the upper fixing sleeve 15 and the limit pin 7 in the first embodiment are replaced by a boss 23, the boss 23 is provided on the inner side of the sliding screw sleeve 4, and the spring 6 is supported by the boss 23.

[0073] Embodiment ten, as Fig.12 The difference between this embodiment and the first embodiment is that a gasket 29, a fixing rod screw 30, and a fixing rod screw sliding hole are provided on the outer wall of the lower part of the sliding screw sleeve 4, the gasket 29 is slidably connected to the sliding screw sleeve 4, the head end of the fixing rod screw 30 is threadedly connected to the upper part of the fixing rod 9, the fixing rod 9 is configured to slide with the lower part of the sliding screw sleeve 4 and the lower part of the fastening screw sleeve 10, two radially penetrating pin holes are provided at different axial heights of the fixing rod 9, and two clamping pipe pins radially penetrate the fixing rod 9 and the upper and lower steps of the fastening screw sleeve 10 respectively.

[0074] Embodiment eleven, as Fig.13The difference between this embodiment and the first embodiment is that a gasket 29, a fixing rod screw 30, a sliding hole for the fixing rod screw 30, and an adjusting nut 31 are provided on the outer wall of the lower part of the sliding screw sleeve 4; the gasket 29 is slidably connected to the sliding screw sleeve 4; the head end of the fixing rod screw 30 is threadedly connected to the upper part of the fixing rod 9; the fixing rod 9 is configured to slide with the lower part of the sliding screw sleeve 4; the adjusting nut 31 is threadedly connected to the lower part of the sliding screw sleeve 4 and is provided below the gasket 29.

[0075] Embodiment 12, as Fig.14 The difference between this embodiment and the first embodiment is that an upper adjusting nut 33 and a lower adjusting nut 34 are provided on the outer wall of the lower part of the sliding screw sleeve 4, the fixing rod 9 is configured to slide with the lower part of the sliding screw sleeve 4, a fixing rod pin 32 is radially provided at the upper end, and the adjusting nut 31 and the adjusting nut 31 are respectively located above and below the fixing rod pin 32, and are threadedly connected to the lower part of the sliding screw sleeve 4.

[0076] Embodiment 13, as Fig.15 The difference between this embodiment and the first embodiment is that two pressure sensor devices are arranged on the external fixing bracket, and the pressure sensor device includes a pressure sensor 36 arranged in the external fixing bracket, and a connecting wire 37 connecting the pressure sensor 36 and the pressure gauge 38. The specific setting position is: one pressure sensor is arranged between the spring base 5 and the limit pin 7, and the pressure sensor of the other pressure sensor device is arranged between the end of the stress guide rod and the step at the tail of the adjusting nut. The tail of the adjusting nut is provided with a connecting wire hole, and the connecting wire passes through the connecting wire hole and is connected to the pressure gauge.

[0077] Embodiment 14, as Fig.16 The difference between this embodiment and the fourth embodiment is that a pressure sensor device is arranged on the external fixing bracket, and the pressure sensor device includes a pressure sensor 36 arranged in the external fixing bracket, and a connecting wire 37 connecting the pressure sensor 36 and the pressure gauge 38. The pressure sensor is specifically arranged between the end of the stress guide rod and the step at the tail of the adjusting nut, and a connecting wire hole is arranged at the tail of the adjusting nut, and the connecting wire passes through the connecting wire hole and is connected to the pressure gauge.

[0078] Embodiment 15, as Fig.17 The difference between this embodiment and the fifth embodiment is that a pressure sensor device is arranged on the external fixing bracket, and the pressure sensor device includes a pressure sensor 36 arranged in the external fixing bracket, and a connecting wire 37 connecting the pressure sensor 36 and the pressure gauge 38. The pressure sensor is specifically arranged between the balloon base and the limit pin 1, in the sliding screw sleeve, and is slidably connected to the sliding screw sleeve. The side wall of the sliding screw sleeve is provided with a connecting wire hole, and the connecting wire passes through the connecting wire hole and is connected to the pressure gauge.

[0079] Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can also be implemented through other structures, especially by combining the above several pressure-adjusting fixed arms with rod clamps, needle clamps, half rings or rings and other accessories to form various fixed brackets. Therefore, the features of the present invention are not limited to the above preferred embodiments. Any changes or modifications that can be easily thought of by any person familiar with the technology within the technical field of the present invention should be covered within the scope of patent protection of the present invention.

Claims

1. A top unidirectional adjustable elastic external fixation bracket fixed arm, comprising an adjustment rod, a stress guide rod, a sliding screw sleeve, an elastic device, a fixing rod and a fixing structure for fixing the adjustment rod, characterized in that: It also includes an adjustment device, which pushes the stress guide rod to move along its axial direction. The stress guide rod is located in the adjustment rod. One end sleeve of the adjustment rod is slidably connected with the sliding screw sleeve. The other end of the adjustment rod is provided with an adjustment device threadedly connected thereto. The sliding screw sleeve is sleeved on the outside of one end of the fixed rod. The adjusting rod can be slightly adjusted in the axial direction relative to the sliding screw sleeve, but cannot rotate relative to it; The stress guide rod is slidably connected relative to the adjustment rod; The elastic device provides elastic stress during the process of fine-tuning the stress guide rod in the axial direction up and down; The fixing structure of the sliding screw sleeve is used to fix the adjusting rod and limit the axial movement of the adjusting rod.

2. The top unidirectional adjustable elastic external fixation bracket fixing arm according to claim 1, characterized in that: The regulating device is one of the following: a. The adjusting device is of the adjusting nut type, including an adjusting nut and a graduated rod. The adjusting nut is threadedly connected to the adjusting rod, a step is arranged at the tail, the top of the stress guide rod abuts against the step of the adjusting nut, the graduated rod is tightly connected to the stress guide rod, and is slidably connected to the tail of the adjusting nut, and a pressure scale is arranged on the side wall; b. The adjusting device is of adjusting bolt type, including adjusting bolt, scale sleeve, and support spring. The scale sleeve is sleeved outside the adjusting bolt and adjusting rod, and a step is arranged at the tail end. The scale sleeve, adjusting bolt, and adjusting rod are slidingly connected. A support spring is arranged between the tail end of the adjusting rod and the tail end of the scale sleeve, and a pressure scale is arranged on the outer wall of the adjusting rod.

3. The top unidirectional adjustable elastic external fixation bracket fixing arm according to claim 2, characterized in that: The fixing structure of the sliding screw sleeve is one of the following: a. Anti-rotation pins and upper fastening screws are radially arranged on the upper part of the sliding screw sleeve. The anti-rotation pins are adapted to the anti-rotation pin holes arranged on the lower part of the adjusting rod. The axial length of the anti-rotation pin holes is greater than the lateral length to prevent the adjusting rod from rotating in the horizontal direction. After the upper fastening screws are screwed in, they abut against the fixed circular holes arranged on the outer wall of the adjusting rod to prevent the adjusting rod from moving up and down relative to the sliding screw sleeve. b. An anti-rotation pin is radially arranged on the upper part of the sliding screw sleeve, which is adapted to the anti-rotation pin hole arranged on the lower part of the adjusting rod to prevent the adjusting rod from rotating horizontally. A fastening screw sleeve is arranged at the top end of the upper part of the sliding screw sleeve, and the fastening screw sleeve is threadedly connected to the outer wall of the adjusting rod. The fastening screw sleeve is screwed down and abuts against the top end of the upper part of the sliding screw sleeve to prevent the adjusting rod from moving up and down relative to the sliding screw sleeve.

4. The top unidirectional adjustable elastic external fixation bracket fixing arm according to claim 3, characterized in that: The specific connection method between the sliding screw sleeve and the fixing rod is one of the following methods: (a) A fixed screw sleeve is provided on the outer wall of the lower part of the sliding screw sleeve, which is connected to the sliding screw sleeve by a thread. A fastening screw sleeve is sleeved on the fixing rod, and the open end of the fastening screw sleeve is located outside the fixing screw sleeve. A lower fastening screw is radially provided on the fixing screw sleeve. After the lower fastening screw is screwed in, it abuts against a step provided on the outer wall of the fixing rod to prevent the fixing rod from moving relative to the sliding screw sleeve; the fixing rod is slidably matched with the lower part of the sliding screw sleeve and the fastening screw sleeve. Two radially penetrating pin holes are provided at different axial heights of the fixing rod, and clamping pins are respectively installed. After the clamping pin radially penetrates the pin hole of the fixing rod, it is respectively located at the upper and lower steps of the fastening screw sleeve, and can drive the fixing rod to move up and down as the fastening screw sleeve moves up and down; (b) A fixing nut is provided on the outer wall of the lower part of the sliding screw sleeve, which is fastened to the sliding screw sleeve by a fixing pin, and a fastening screw is radially provided on the side wall of the fixing nut to fix the fixing rod; two radially penetrating pin holes are provided at different axial heights of the fixing rod, and two clamping pins radially penetrate the fixing rod and are respectively located at the upper and lower steps of the fastening screw sleeve; (c) A cylindrical thickened wall portion is provided on the outer wall of the lower part of the slip-on screw sleeve, and a boss is provided inside. The elastic device is located on the boss. A fastening screw is radially provided on the slip-on screw sleeve. The fastening screw is threadedly connected to the lower part of the slip-on screw sleeve, and its head end corresponds to the step provided on the side surface of the upper end of the fixing rod to fix the fixing rod; the fixing rod is configured to be slidably matched with the lower part of the slip-on screw sleeve and the lower part of the fastening screw sleeve. Two radially penetrating pin holes are provided at different axial heights of the fixing rod, and clamping pins are respectively installed thereon. After the clamping pin radially penetrates the pin hole of the fixing rod, it is respectively matched with the upper and lower steps of the fastening screw sleeve and the lower end of the fastening nut, and can drive the fixing rod to move up and down as the fastening screw sleeve moves up and down; (d) A gasket, a fixing rod screw, and a fixing rod screw sliding hole are arranged on the outer wall of the lower part of the sliding screw sleeve. A circular hole is arranged radially on the gasket. The fixing rod screw radially crosses the circular hole of the gasket. The head end of the fixing rod screw is threadedly connected with the upper part of the fixing rod. The axial diameter of the fixing rod screw sliding hole is greater than the transverse diameter. The fixing rod is arranged to slide with the lower part of the sliding screw sleeve and the lower part of the fastening screw sleeve. Two radially penetrating pin holes are arranged at different axial heights of the fixing rod, and clamping pipe pins are respectively installed. After the clamping pipe pin radially penetrates the pin hole of the fixing rod, it is respectively matched with the upper and lower steps of the fastening screw sleeve and the lower end of the fastening screw sleeve, and can drive the fixing rod to move up and down as the fastening screw sleeve moves up and down; (e) A gasket, a fixing rod screw, a fixing rod screw sliding hole, and an adjusting nut are arranged on the outer wall of the lower part of the sliding screw sleeve. A circular hole is arranged radially on the gasket. The fixing rod screw radially crosses the circular hole of the gasket. The head end of the fixing rod screw is threadedly connected with the upper part of the fixing rod. The axial diameter of the fixing rod screw sliding hole is greater than the transverse diameter. The adjusting nut is threadedly connected with the lower part of the sliding screw sleeve and is arranged below the gasket. The fixing rod is arranged to slide with the lower part of the sliding screw sleeve, and a screw hole adapted to the fixing rod screw is arranged radially on the upper end. (f) An upper adjusting nut and a lower adjusting nut are arranged on the outer wall of the lower part of the sliding screw sleeve, and a fixing rod pin sliding hole is arranged radially on both sides, the axial length of the fixing rod pin sliding hole is greater than the lateral width, the fixing rod is arranged to slide with the lower part of the sliding screw sleeve, and a fixing rod pin is arranged radially on the upper end, and two adjusting nuts are respectively located above and below the fixing rod pin, and are threadedly connected with the lower part of the sliding screw sleeve, so as to drive the fixing rod pin and the fixing rod to move up and down; (g) The lower part of the sliding nut is fastened to the upper part of the fixing rod by a pin.

5. The top unidirectional adjustable elastic external fixation bracket fixing arm according to claim 4, characterized in that: The specific structure of the elastic device is one of the following: (a) The elastic device includes a spring, which is placed in the sliding screw sleeve. A radial limit pin 1 is provided on the sliding screw sleeve. The spring is provided with a spring base, which is placed between the limit pin 1 and the spring base. The spring is supported by the limit pin 1. The spring base abuts against one end of the stress guide rod. An annular upper fixing sleeve is provided outside the limit pin 1 and the sliding screw sleeve. Both sides of the limit pin 1 are located in the limit pin fixing holes provided on the upper fixing sleeve. (b) The elastic device includes a spring, which is placed outside the sliding screw sleeve. The lower part of the sliding screw sleeve is provided with a limit hole and a slide groove which penetrate radially on both sides. A limit pin 1 is arranged in the limit hole. The limit pin 1 radially penetrates the limit hole of the sliding screw sleeve. Below the limit pin 1, an adjusting nut is sleeved on the outer wall of the lower part of the sliding screw sleeve. A limit pin 2 is arranged in the slide groove. The limit pin 2 can slide up and down in the slide groove. An annular upper fixing sleeve and a lower fixing sleeve are arranged at both ends of the limit pin 1 and the limit pin 2, respectively. The two ends of the limit pin 1 and the limit pin 2 are located in the limit pin holes arranged on the upper fixing sleeve and the lower fixing sleeve; (c) The elastic device includes an elastic balloon, which is provided with a balloon base. The sliding screw sleeves on both sides of the elastic balloon are respectively provided with radially penetrating limit holes and sliding grooves, and limit pins are arranged in the limit holes. The limit pins radially penetrate the limit holes of the sliding screw sleeves, and the limit pins are arranged in the sliding grooves. The limit pins can slide up and down in the sliding grooves; an annular upper fixing sleeve and a lower fixing sleeve are respectively arranged at both ends of the limit pins 1 and 2, and the ends of the limit pins 1 and 2 are located in the limit pin holes arranged on the upper fixing sleeve and the lower fixing sleeve; (d) The elastic device includes a spring, which is placed above the stress guide rod and inside the adjusting rod. The adjusting device adjusts the force of the spring, thereby giving stress to the stress guide rod and the sliding screw sleeve, and the sliding screw sleeve then gives a reaction force to the stress guide rod, the spring, the adjusting screw sleeve or the adjusting bolt, and the adjusting rod; (e) The stress guide rod is provided with two sections, the upper and lower sections, the elastic device is provided between the upper and lower stress guide rods, the elastic device comprises a spring, the elastic device adjusts the force of the spring, thereby imparting stress to the stress guide rod and the sliding screw sleeve, and the sliding screw sleeve further imparts a reaction force to the stress guide rod, the spring, the adjusting screw sleeve or the adjusting bolt, and the adjusting rod; (f) The elastic device includes a spring, which is placed in the sliding screw sleeve. The sliding screw sleeve is provided with radial limit pin 1 and limit pin 2, and the spring is placed between limit pin 1 and limit pin 2. The sliding screw sleeve is provided with limit pin hole 1 and limit pin hole 2 respectively matching with limit pin 1 and limit pin 2, and the axial diameter thereof is greater than the transverse diameter. An annular upper fixing sleeve and a lower fixing sleeve are provided outside the limit pin 1 and the limit pin 2, and both sides of the limit pin 1 and the limit pin 2 are located in the limit pin fixing holes provided on the upper fixing sleeve and the lower fixing sleeve; the stress guide rod is located in the fixed rod and is slidably connected to the fixed rod, one end of the stress guide rod abuts against the limit pin 2, and the other end abuts against the adjusting screw sleeve or the adjusting bolt provided at the tail end of the fixed rod.

6. The top unidirectional adjustable elastic external fixation bracket fixing arm according to claim 5, characterized in that: The external fixing bracket also includes an elastic device pressure display device, which is composed of a pressure sensor, a connecting line, and a pressure gauge. The pressure sensor is located at one of the following positions; (a) The pressure sensor is arranged between the end of the stress guide rod and the step at the tail of the adjusting nut. A connecting wire hole is arranged at the tail of the adjusting nut. The connecting wire passes through the connecting wire hole and is connected to the pressure gauge. (b) The pressure sensor is arranged between the limit pin 1 and the spring, inside the sliding screw sleeve, and is slidably connected to the sliding screw sleeve. A connecting wire hole is arranged on the side wall of the sliding screw sleeve, and the connecting wire passes through the connecting wire hole and is connected to the pressure gauge; (c) The pressure sensor is arranged between the spring base and the lower end of the stress guide rod, in the sliding screw sleeve, and is slidably connected to the sliding screw sleeve. A connecting wire hole is arranged on the side wall of the sliding screw sleeve, and the connecting wire passes through the connecting wire hole and is connected to the pressure gauge; (d) The pressure sensor is arranged between the adjusting bolt and the upper end of the stress guide rod, inside the adjusting rod, and is slidably connected to the adjusting rod. A connecting wire hole is arranged in the axial direction of the adjusting bolt, and the connecting wire passes through the connecting wire hole and is connected to the pressure gauge; (e) The pressure sensor is arranged between the balloon base and the limit pin 1, inside the sliding screw sleeve, and is slidably connected to the sliding screw sleeve. A connecting wire hole is arranged on the side wall of the sliding screw sleeve, and the connecting wire passes through the connecting wire hole and is connected to the pressure gauge.

7. The top unidirectional adjustable elastic external fixation bracket fixing arm according to any one of claims 1 to 6, characterized in that: The stress guide rod and the fixing rod are either a cylindrical rod with a hollow structure or a cylindrical rod with a solid structure.

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