Equipment for establishing pelvic crista iliaca external fixation frame screw channel

Abstract

The invention relates to the technical field of pelvic minimally invasive surgeries, and particularly discloses a device for establishing a pelvic crista iliaca external fixation frame screw channel, which comprises a sleeve I and a sleeve II sleeved on the inner side of the sleeve I. A conical tip and a probe with a blunt bottom are further arranged in the sleeve I. The probe is slidably sleeved on the conical tip. The side wall of the probe is in sliding contact with the inner side wall of the sleeve II; the top of the conical tip is fixedly provided with a hand cone, the hand cone is sleeved with a first annular shell in a sliding and sealing mode, the outer side wall of the first annular shell is fixedly sleeved with a second annular shell, and the outer side wall of the second annular shell is in sliding contact with the inner side wall of the first sleeve; a plurality of through holes are formed in the side wall, close to the bottom, of the first annular shell. According to the device, the conical tip, the probe and the sleeve are integrally designed, meanwhile, on the operation level, medical staff only need to continuously push the handle downwards and finally hold the handle to pull out the handle, a pelvic crista iliaca external fixation screw channel can be established, and the efficiency of establishing the screw channel is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of pelvic minimally invasive surgery, and in particular to a device for establishing a screw channel for a pelvic iliac clivus external fixator. Background Art

[0002] Pelvic external fixation is a common emergency treatment method in orthopedic trauma, especially when dealing with unstable pelvic fractures. This treatment method can reduce the pelvic container, self-packing and resuscitation treatment. At present, there are two main forms of pelvic external fixation. One is an external fixator with screws inserted through the anterior inferior iliac spine (AIIS), referred to as the AIIS external fixator; the other is an external fixator with screws inserted through the iliac crest (IC), referred to as the IC external fixator, that is, the iliac crest external fixator. Because the iliac crest bone is closer to the body surface, the latter is simpler to implement and more widely used. In addition, compared with the former, the latter is particularly conducive to hip joint functional exercise and functional rehabilitation because its external fixator is farther away from the hip joint.

[0003] At present, the technology used for inserting IC external fixator screws in clinical practice usually adopts minimally invasive percutaneous insertion, specifically, the skin at the screw entry point is cut along the iliac crest (the incision length is about 1 cm), and the external fixation screw is inserted and its position is determined under the fluoroscopy of the C-arm X-ray machine. The advantages of minimally invasive percutaneous insertion are small soft tissue damage, less bleeding, and low infection and other complication rates. However, before fixing the external fixator for screw insertion, it is more complicated to establish the screw channel. The conventional method is to first open the cortical layer through the cone tip, and then insert the blunt head into the iliac cancellous bone from the cortical layer opening to form the opening of the screw channel. Finally, the probe is rotated to confirm whether the blunt head has penetrated the iliac cortical layer when establishing the channel, and whether the entire screw channel is located in the cancellous bone and remains intact. In the prior art, in order to better establish a screw channel and maintain its direction, a Chinese invention patent (CN104665920A) discloses a channel preparation tool for pelvic iliac crest external fixator screws. The tool kit is provided with two hollow sleeves, wherein the hollow sleeve 2 is located inside the hollow sleeve 1 and is fixed at the percutaneous opening position by the hollow sleeve 1. Then a hand awl is inserted into the hollow sleeve 2, and the cone tip at the lower end of the hand awl pierces the cortical layer of the iliac crest bone. Finally, the hand awl is pulled out and a probe with a blunt head is inserted into the cancellous bone of the iliac bone. While establishing the screw channel, the bottom spike of the hollow sleeve 2 is inserted into the area around the screw entry point on the iliac crest bone to maintain the direction of the screw channel.

[0004] In the above scheme, although a set of professional instruments and tools for establishing the screw channel of the external fixator is designed, which can realize the opening, positioning, establishment of the screw channel and maintenance of the direction, from the perspective of use, it is still necessary to use different tools in sequence according to the conventional steps to achieve the corresponding effect, and the operation is relatively cumbersome. Therefore, in response to the above problem, the applicant invented an integrated design of a professional device for establishing the pelvic iliac crest external fixation screw channel. Summary of the invention

[0005] The purpose of the present invention is to solve the technical problems raised in the above-mentioned background technology and to provide a device for establishing a screw channel for a pelvic iliac crest external fixator. The device not only integrates the cone tip, the probe and the sleeve into an integrated design, but also, at the operational level, medical staff only need to continuously push the handle downward and finally hold the handle and pull it outward to establish the pelvic iliac crest external fixation screw channel, thereby greatly improving the efficiency of establishing the screw channel.

[0006] The above-mentioned purpose of the present invention is achieved like this:

[0007] A device for establishing a screw channel for a pelvic iliac clivus external fixator comprises a sleeve 1 and a sleeve 2 which is sleeved on the inner side of the sleeve 1, wherein a probe with a cone tip and a blunt bottom is provided in the sleeve 1, the probe is slidably sleeved on the cone tip, and the side wall of the probe is in sliding contact with the inner side wall of the sleeve 2; a hand cone is fixedly installed on the top of the cone tip, and a sliding sealing sleeve on the hand cone is provided with an annular shell 1, an annular shell 2 is fixedly sleeved on the outer side wall of the annular shell 1, and the outer side wall of the annular shell 2 is in sliding contact with the inner side wall of the sleeve 1; a plurality of through holes are provided on the side wall of the annular shell 1 near its bottom, and the through holes connect the sealed chambers of the annular shell 1 and the annular shell 2, annular pistons 1 and 2 are provided in the annular shell 1 and the annular shell 2 respectively, and a sealed chamber formed by the annular pistons 1, 2, the annular shell 1, the annular shell 2 and the through holes is filled with incompressible Fluid; at least one limiting groove is opened on the side wall of the hand cone along its length direction, an annular piston 1 is slidably sleeved on the side wall of the hand cone and slidably contacts with the limiting groove, and the sliding friction coefficient between the annular piston 1 and the hand cone is less than the sliding friction coefficient between the annular piston 1 and the annular shell 1; at least one telescopic rod and a connecting rod are fixedly installed on the top and bottom of the annular piston 2 respectively, the top of the telescopic rod is the telescopic end, and a connecting ring with a hole diameter matching the diameter of the hand cone is fixedly installed on the top of the telescopic rod, at least one horizontal groove is opened in the circumferential direction in the connecting ring, and a limiting mechanism for limiting the hand cone is provided in the horizontal groove; the limiting end of the limiting mechanism is located at the middle opening position of the connecting ring and contacts with the top of the hand cone; the bottom of the connecting rod passes through the bottom surface of the annular shell 2, and the bottom surface of the connecting rod can push the probe and the sleeve 2 to move along the length direction of the sleeve 1.

[0008] Furthermore, the limiting mechanism includes a spring, a slider, a limiting rod and an insert block; a socket connected to the horizontal slide groove is opened at the bottom of the connecting ring, and the two ends of the spring are fixedly connected to the bottom of the horizontal slide groove and the end of the slider respectively; the slider is in contact with the horizontal slide groove, and the end of the slider away from the spring is fixedly connected to the limiting rod, and the limiting rod passes through the horizontal slide groove; a limiting groove with an inclined side surface is opened at the bottom of the slider, and when the spring is in a natural state, the inclined surface of the limiting groove is aligned with the socket, and the end of the limiting rod is located at the middle opening position of the connecting ring and in contact with the top of the hand cone; the insert block is fixedly installed at the top position of the fixed section of the telescopic rod, and the insert block can be inserted into the socket.

[0009] Furthermore, a connecting cylinder is fixedly installed on the top of the probe, the connecting cylinder is slidably sleeved on the hand cone, and the top of the connecting cylinder is fixedly connected to the bottom of the connecting rod.

[0010] Furthermore, a handle is installed on the top of the connecting ring.

[0011] Furthermore, a fixing bolt is detachably provided on the side wall of the first sleeve, and the end of the fixing bolt contacts the outer side wall of the second annular housing.

[0012] Furthermore, the bottom of the sleeve 1 is a serrated surface, and the bottom of the sleeve 2 is provided with a plurality of spikes at equal intervals along its circumferential direction.

[0013] Furthermore, a through groove along the length direction is opened in the probe and the hand cone, and a probe that can move along the length direction is arranged in the through groove; a placement groove matching the shape of the front end of the probe is opened at the bottom of the probe.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The annular shell 1 is sealed and movably sleeved on the hand cone, and part of it is located in the limiting slide groove of the hand cone. The annular shell 2 is fixedly sleeved on the annular shell 1. The annular piston 2 is slidably installed in the annular shell 2. The annular piston 2 is connected to the connecting ring through a telescopic rod. In this way, when the handle is held and pushed forward, first, under the action of the telescopic rod and the limiting slide groove, the cone tip moves downward alone, extends from the bottom of the sleeve 1 and pierces the iliac crest bone cortex, and then the cone tip automatically retreats, the probe moves downward, and the probe and the cone tip form a blunt head. Secondly, the probe and the cone tip move together from the opening of the cortical layer into the cancellous bone, and finally the handle is held and pulled out to form a screw channel for external fixation in the pelvic iliac crest. During the whole process, medical staff only need to hold the handle and push it downward, and then pull it out, which is simple to operate and improves the efficiency of the operation.

[0016] 2. Install the sleeve 2 in the sleeve 1. The bottom of the connecting rod can contact the top of the sleeve 2 during the downward movement. In this way, when the probe and the cone tip form a blunt head and move into the cancellous bone, the sleeve 2 can also slide along the sleeve 1 and extend from the bottom of the sleeve 1. Finally, the spike of the sleeve 2 is inserted into the cortical bone of the iliac crest and fixed around the entry point on the iliac crest to maintain the direction of the screw channel. In addition, the sleeve 2 can also serve as a reminder to medical staff. When the spike of the sleeve 2 penetrates into the bone of the iliac crest, the handle can no longer be pushed, and the screw channel is also established. The medical staff can now hold the handle to pull out the device.

[0017] 3. A slider that can move along the horizontal slide groove is arranged in the horizontal slide groove of the connecting ring, and a limit groove with an inclined side surface is arranged at the bottom of the slider, and the plug hole is aligned with the inclined surface of the limit groove. In addition, an insert block that can be inserted into the plug hole position is fixedly installed on the top of the fixed section of the telescopic rod, so that when the handle is held and pushed downward, the hand cone can be pushed downward synchronously under the action of multiple limit rods, and when the connecting ring touches the top of the fixed section of the telescopic rod, the limit rod moves toward the inside of the horizontal slide groove under the action of the insert block, so that after the cone tip pierces the iliac crest bone cortex, the hand cone and the cone tip can realize the retraction operation under the action of the annular piston 2 and the annular piston 1;

[0018] 4. A through groove located on the same vertical axis is opened in the probe and the hand cone, and the probe is located in the through groove. After the external fixation screw channel is established, the probe can be rotated to make the front end of the probe contact the wall of the screw channel. If a rustling sound is heard, it means that the probe and the cone tip did not pass through the iliac cortical layer when the channel was established, and the entire screw channel is located in the cancellous bone. In addition, a placement groove matching the shape of the probe is opened at the front end of the probe. During the process of establishing the channel, the probe is lifted up to make the front end of the probe located in the placement groove, so as to avoid the probe affecting the formation effect of the screw channel.

[0019] 5. Install a fixing bolt on the side wall of sleeve one, and the end of the fixing bolt contacts the outer side wall of annular shell two. In this way, the annular shell two is fixed by the fixing bolt, which can prevent the annular shell two from sliding downward along sleeve one when the handle is pressed down before the screw channel is established, thereby improving the stability of the equipment during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a device for establishing a pelvic iliac crest external fixation screw channel in an initial state provided by Embodiment 1 of the present invention;

[0021] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0022] Figure 3It is a schematic diagram of the structure of a device for establishing a pelvic iliac crest external fixation screw channel provided by Example 1 of the present invention when the cone tip pierces the iliac crest bone cortex;

[0023] Figure 4 It is a schematic structural diagram of a device for establishing a pelvic iliac crest external fixation screw channel provided by Embodiment 1 of the present invention, in which a blunt head is formed with the probe when the cone tip is retracted;

[0024] Figure 5 yes Figure 4 The enlarged view of point A in the middle;

[0025] Figure 6 It is a schematic structural diagram of a device for establishing a pelvic iliac crest external fixation screw channel provided by Embodiment 1 of the present invention when the cone tip and the probe are synchronously moved into the cancellous bone;

[0026] Figure 7 It is a schematic structural diagram of a device for establishing a pelvic iliac crest external fixation screw channel provided by Embodiment 1 of the present invention when a complete screw channel is formed in cancellous bone;

[0027] Figure 8 is a schematic diagram of the structure after the probe and the cone tip are pulled out from the screw channel in Example 1 of the present invention;

[0028] Fig. 9 It is a schematic diagram of the structure between the annular shell 1, the annular shell 2 and the hand cone in Example 1 of the present invention;

[0029] Fig.10 yes Fig. 9 Cross-sectional view at AA in the middle;

[0030] Fig.11 is a cross-sectional view of the connecting ring located at the horizontal slide groove position in Example 1 of the present invention;

[0031] Fig.12 It is a schematic structural diagram of a device for establishing a pelvic iliac crest external fixation screw channel in Example 2 of the present invention in an initial state;

[0032] Fig.13 is a positional relationship diagram between the front end position of the probe and the front end of the probe in Embodiment 2 of the present invention;

[0033] Fig.14 It is a half-section view of a device for establishing a pelvic iliac crest external fixation screw channel in Example 3 of the present invention.

[0034] Reference numerals in the above drawings:

[0035] 1. Sleeve 1; 2. Sleeve 2; 3. Probe; 4. Cone tip; 5. Connecting cylinder; 6. Connecting rod; 7. Annular shell 1; 8. Annular piston 1; 9. Limiting slide groove; 10. Hand cone; 11. Connecting ring; 12. Handle; 13. Insert block; 14. Telescopic rod; 15. Annular piston 2; 16. Annular shell 2; 17. Spring; 18. Socket; 19. Limiting groove; 20. Limiting rod; 21. Horizontal slide groove; 22. Slider; 23. Through hole; 24. Through groove; 25. Probe; 26. Placement groove; 27. Fixing bolt. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0038] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0039] Reference Figure 1-Figure 14 As shown, the following are preferred embodiments provided by the present invention.

[0040] Embodiment 1: A device for establishing a screw channel for an iliac clivus external fixator of the pelvis, comprising a sleeve 1 and a sleeve 2 sleeved inside the sleeve 1. In this embodiment, the bottom surface of the sleeve 1 is a serrated surface, and the bottom surface of the sleeve 2 is provided with a plurality of spikes equidistantly along the circumferential direction of its bottom. A cone tip 4 and a probe 3 with a blunt bottom are also provided inside the sleeve 1. The maximum diameter of the probe 3 is slightly smaller than the diameter of the sleeve 2. The maximum diameter of the probe 3 is 3.5 mm. The probe 3 can slide up and down along the inside of the sleeve 2. At the same time, the probe 3 is slidably sleeved on the cone tip 4. A hand cone 10 is fixedly installed on the top of the cone tip 4. A ring shell 7 is slidably and sealedly sleeved on the hand cone 10. In combination with the cone tip 4, a hand cone 10 is fixedly installed on the top of the cone tip 4. Figure 1 and Fig. 9As shown, an annular shell 16 is fixedly sleeved on the outer side wall of the annular shell 17. In the present embodiment, the annular shell 17 and the annular shell 16 are integrally formed; the outer side wall of the annular shell 16 is in sliding contact with the inner side wall of the sleeve 1; a plurality of through holes 23 are provided on the side wall of the annular shell 17 near its bottom and located on the same horizontal plane, and the through holes 23 connect the sealing chambers of the annular shell 17 and the annular shell 16, so that a sealed chamber is formed between the annular piston 15, the through holes 23, the annular piston 18, the annular shell 17 and the annular shell 16. In the present embodiment, the sealed chamber is filled with hydraulic oil, so that the transmission effect between the annular piston 18 and the annular piston 15 can be achieved by means of hydraulic oil. In order not to affect the sliding of the annular piston 18 and the annular piston 2 15 in the annular housing 17 and the annular housing 2 16, a pressure relief hole (not marked in the figure) is opened on the top of the annular piston 18 and the annular piston 2 15 so that the top space of the annular piston 18 and the annular piston 2 15 is connected to the outside, so that the annular piston 18 and the annular piston 2 15 can move along the height direction of the annular housing 17 and the annular housing 2 16. In this embodiment, if Fig. 9 and Fig.10 As shown, the side wall of the hand cone 10 is provided with 6 vertical limiting grooves 9, and the annular piston 8 is slidably sleeved on the side wall of the hand cone 10 and is partially located in the limiting groove 9 and is in sealing and sliding contact with it. The sliding friction coefficient between the annular piston 8 and the hand cone 10 is smaller than the sliding friction coefficient between the annular piston 8 and the annular shell 7; the sliding friction coefficient between the outer wall of the annular shell 16 and the inner wall of the sleeve 1 is larger than the sliding friction coefficient between the annular piston 8 and the annular shell 7. In order to improve the stability of the equipment, two telescopic rods 14 and a connecting rod 6 are symmetrically fixedly installed on the top and bottom of the annular piston 15, respectively. The fixed section of the telescopic rod 14 is fixedly connected to the top of the annular piston 15, and a connecting ring 11 is fixedly installed on the top of the telescopic section of the telescopic rod 14. The aperture of the opening in the middle of the connecting ring 11 matches the diameter of the hand cone 10, so that the hand cone 10 can pass through the opening in the middle of the connecting ring 11. A connecting ring 11 with an aperture matching the diameter of the hand cone 10 is fixedly installed on the top of the telescopic rod 14. As shown Fig.11 As shown, in this embodiment, four horizontal slide grooves 21 are opened in the circumferential direction in the connecting ring 11, and a limiting mechanism for limiting the hand cone 10 is installed in each of the four horizontal slide grooves 21; the limiting end of the limiting mechanism is located at the middle opening position of the connecting ring 11 and contacts the top of the hand cone 10; the bottom of the connecting rod 6 passes through the bottom surface of the annular shell 16, and the bottom surface of the connecting rod 6 can push the probe 3 and the sleeve 2 2 to move along the length direction of the sleeve 1.

[0041] In this embodiment, the specific structure of the limiting mechanism is as follows: Figure 2As shown, it is specifically composed of a spring 17, a slider 22, a limit rod 20 and an insert block 13; a socket 18 connected to the horizontal slide groove 21 is provided at the bottom of the connecting ring 11, and the two ends of the spring 17 are respectively fixedly connected to the bottom of the horizontal slide groove 21 and the end of the slider 22; the slider 22 can move along the horizontal slide groove 21, and the end of the slider 22 away from the spring 17 is fixedly connected to the limit rod 20, and the limit rod 20 passes through the horizontal slide groove 21. In the initial state, the spring 17 is in a natural state, at which the limit rod 20 contacts the top of the hand cone 10. And a limit groove 19 with an inclined surface on the left side is provided at the bottom of the slider 22. When the spring 17 is in the natural state, the inclined surface of the limit groove 19 is aligned with the socket 18, and the end of the limit rod 20 is located at the middle opening position of the connecting ring 11 and contacts the top of the hand cone 10; as shown Figure 1 As shown, the plug block 13 is fixedly installed at the top position of the fixed section of the telescopic rod 14, and the plug block 13 can be inserted into the plug hole 18. Figure 5 As shown, when the telescopic rod 14 is retracted to the minimum length, the plug block 13 is inserted into the insertion hole 18 and contacts the inclined surface of the limit groove 19 of the slider 22. Under the squeezing action of the plug block 13, the slider 22 moves to the left along the horizontal slide groove 21, so that the limit rod 20 is separated from the hand cone 10, so that the hand cone 10 can be retracted in subsequent operations. In addition, in this embodiment, in order to facilitate the operation of medical staff, a ring-shaped handle 12 is fixedly installed on the top of the connecting ring 11. The handle 12 is designed to be ring-shaped so that the hand cone 10 can be retracted after piercing the cortical layer of the iliac crest bone.

[0042] In this embodiment, a connecting cylinder 5 is fixedly installed on the top of the probe 3. The top side wall of the connecting cylinder 5 is a bulge, and the bulge is fixedly connected to the bottom of the connecting rod 6, so that when the connecting rod 6 moves, the connecting cylinder 5 and the probe 3 can be driven to move up and down synchronously; in addition, the inner diameter of the connecting cylinder 5 is the same as the diameter of the hand cone 10, and the hand cone 10 can move up and down along the inside of the connecting cylinder 5, and the connecting cylinder 5 is slidably sleeved on the hand cone 10.

[0043] Working principle: When using the device, first insert sleeve 2 into sleeve 1. The entire device is in the initial state. Figure 1As shown, the medical staff determines the entry point on the iliac crest where the screws of the pelvic external fixator are to be inserted, and then inserts the serrated surface of the sleeve 1 of the device from the small incision at that position, presses against the surface of the iliac crest bone, and then pushes the handle 12. Since the telescopic rod 14 is in an extended state at this time, under the limiting action of the limiting rod 20, the connecting ring 11 drives the hand cone 10 and the cone tip 4 to move toward the cortical layer of the iliac crest bone. At this time, when the connecting ring 11 moves, it only compresses the telescopic rod 14, and the annular piston 1 8 and the annular piston 2 15 both stay in the initial position. However, in this process, the relative position of the annular piston 1 8 and the limiting groove 9 changes. In the initial state, the annular piston 1 8 is located at the bottom of the limiting groove 9. When the hand cone 10 moves downward, it finally pierces the cortical layer of the iliac crest bone. At this time, Figure 3 As shown, the annular piston 8 is located at the top of the limiting slide groove 9; in this state, the Figure 5 As shown, the insert block 13 is now inserted into the insertion hole 18 and contacts the inclined surface of the limiting groove 19. At this time, the inclined surface of the limiting groove 19 of the slider 22 moves along the horizontal slide groove 21 under the action of squeezing and squeezes the spring 17. At this time, the limiting rod 20 also moves toward the inside of the horizontal slide groove 21, so that the limiting rod 20 is separated from the hand cone 10. After piercing the cortical layer of the iliac crest bone, continue to push the handle 12. Since the limiting rod 20 has been separated from the hand cone 10, the telescopic rod 14 moves downward under the thrust of the connecting ring 11 and pushes the annular piston 2 15 downward. The enclosed space below the annular piston 2 15 and below the annular piston 1 8 is filled with hydraulic oil, which is an incompressible fluid. The annular piston 2 15 moves the annular piston 1 8 upward under the action of the hydraulic oil. Since the annular piston 1 8 is already located at the top of the limiting slide groove 9, the annular piston 1 8 will push the hand cone 10 upward, thereby allowing the cone tip 4 to retreat; at the same time, under the action of the connecting rod 6, the connecting cylinder 5 and the probe 3 will be pushed downward. When the annular piston 1 8 moves to the top position of the annular shell 7, at this time, Figure 4 As shown, a blunt tip is formed between the probe 3 and the cone tip 4. The medical staff continues to push the handle 12 downwards. Since the annular piston 18 is already at the topmost position of the annular housing 17, the connecting ring 11 directly pushes the entire annular housing 17 and the annular housing 2 16 downwards, and the annular housing 2 16 and the sleeve 1 slide. Figure 6 As shown, the blunt tip composed of the cone tip 4 and the probe 3 enters the cancellous bone of the iliac crest through the cortical opening. When the raised position of the connecting cylinder 5 contacts the top surface of the sleeve 2, the handle 12 is pushed continuously. Figure 7As shown, sleeve 2, probe 3 and cone tip 4 move downward synchronously, and probe 3 and cone tip 4 form a screw channel in the cancellous bone. In addition, the bottom cone tip 4 of sleeve 2 is inserted into the cortical bone of the iliac crest and fixed around the screw entry point on the iliac crest to maintain the direction of the screw channel. At this time, probe 3 and cone tip 4 also form a 6-8cm screw channel with a diameter of 3.5mm in the cancellous bone. Finally, the medical staff pulls out probe 3 and cone tip 4, and then pulls out sleeve 1, and finally a stable screw channel is formed.

[0044] Embodiment 2: A device for establishing a screw channel for an iliac clivus external fixator of the pelvis. The difference between this embodiment and the embodiment is that a probe 25 is added to the device. Fig.12 As shown, a through groove 24 of the same size and located on the same vertical axis is opened on the probe 3 and the hand cone 10, and a probe rod is arranged through the through groove 24. The probe rod adopts a conventional probe structure, and the front end has a certain elasticity and a certain bending arc. After the screw channel is established, the medical staff can insert the probe 25 into the screw channel and then rotate it. As long as a rustling sound can be heard, it means that the cone tip 4 and the probe 3 did not penetrate the cortical layer on the side of the iliac crest bone when the screw channel was established.

[0045] In this embodiment, in order to solve the problem of placing the probe 25, a placement groove 26 is provided at the bottom of the probe 3. The size, curvature and shape of the placement groove 26 match the front end of the probe 25. Fig.13 As shown, when the probe 25 is not used, the probe 25 is in the placement groove 26, so that the effect of the screw channel will not be affected.

[0046] Embodiment 3: A device for establishing a screw channel for a pelvic iliac clivus external fixator. The difference between this embodiment and embodiment 1 is that a fixing bolt 27 is installed on the side wall of the sleeve 1. Fig.14 As shown, during the process of the cone tip 4 piercing the cortical layer of the iliac crest bone and retreating, the interference of the fixing bolt 27 can prevent the annular housing 2 16 and the sleeve 1 from sliding. When the cone tip 4 and the probe 3 need to move into the cancellous bone, the fixing bolt 27 can be loosened. The technical solution of this embodiment improves the stability of the device compared to embodiment 1.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for establishing a screw channel for a pelvic iliac clivus external fixator, comprising a sleeve 1 (1) and a sleeve 2 (2) sleeved inside the sleeve 1 (1), characterized in that: The sleeve (1) is also provided with a cone tip (4) and a probe (3) with a blunt bottom. The probe (3) is slidably sleeved on the cone tip (4), and the side wall of the probe (3) is in sliding contact with the inner wall of the sleeve (2). A hand cone (10) is fixedly installed on the top of the cone tip (4), and a sliding sealing sleeve is provided on the hand cone (10) with an annular shell (7). An annular shell (16) is fixedly sleeved on the outer wall of the annular shell (7), and the outer wall of the annular shell (16) is in sliding contact with the inner wall of the sleeve (1). A plurality of through holes (23) are formed on the side wall of the annular shell (7) near the bottom thereof, and the through holes (23) connect the sealed chambers of the annular shell (7) and the annular shell (16). An annular piston (8) and an annular piston (15) are respectively arranged in the annular shell (7) and the annular shell (16). A sealed chamber formed between the annular piston (8), the annular piston (15), the annular shell (7), the annular shell (16) and the through holes (23) is filled with an incompressible fluid. At least one limiting slide groove (9) is formed on the side wall of the hand cone (10) along its length direction; an annular piston (8) is slidably sleeved on the side wall of the hand cone (10) and is in sliding contact with the limiting slide groove (9); the sliding friction coefficient between the annular piston (8) and the hand cone (10) is smaller than the sliding friction coefficient between the annular piston (8) and the annular housing (7); at least one telescopic rod (14) and a connecting rod (6) are fixedly mounted on the top and bottom of the annular piston (15), respectively; the top of the telescopic rod (14) is a telescopic end; the top of the telescopic rod (14) is fixedly mounted on the top of the telescopic rod (14). A connecting ring (11) having an aperture matching the diameter of the hand cone (10) is fixedly installed, at least one horizontal slide groove (21) is opened in the connecting ring (11) along the circumferential direction, and a limiting mechanism for limiting the hand cone (10) is arranged in the horizontal slide groove (21); the limiting end of the limiting mechanism is located at the middle opening position of the connecting ring (11) and contacts the top of the hand cone (10); the bottom of the connecting rod (6) passes through the bottom surface of the annular shell (16), and the bottom surface of the connecting rod (6) can push the probe (3) and the sleeve (2) to move along the length direction of the sleeve (1).

2. The device for establishing a screw channel for a pelvic iliac clivus external fixator according to claim 1, characterized in that: The limiting mechanism comprises a spring (17), a slider (22), a limiting rod (20) and an insert block (13); a plug hole (18) connected to a horizontal slide groove (21) is provided at the bottom of the connecting ring (11); two ends of the spring (17) are respectively fixedly connected to the bottom of the horizontal slide groove (21) and the end of the slider (22); the slider (22) is in contact with the horizontal slide groove (21); one end of the slider (22) away from the spring (17) is fixedly connected to the limiting rod (20); and the limiting rod ( 20) passes through the horizontal slide groove (21); the bottom of the slider (22) is provided with a limiting groove (19) with an inclined side surface; when the spring (17) is in a natural state, the inclined surface of the limiting groove (19) is aligned with the insertion hole (18); the end of the limiting rod (20) is located at the middle opening position of the connecting ring (11) and contacts with the top of the hand cone (10); the plug block (13) is fixedly installed at the top position of the fixed section of the telescopic rod (14), and the plug block (13) can be inserted into the insertion hole (18).

3. The device for establishing a screw channel for a pelvic iliac clivus external fixator according to claim 1, characterized in that: A connecting cylinder (5) is fixedly mounted on the top of the probe (3); the connecting cylinder (5) is slidably sleeved on the hand cone (10); and the top of the connecting cylinder (5) is fixedly connected to the bottom of the connecting rod (6).

4. The device for establishing a screw channel for a pelvic iliac clivus external fixator according to claim 1, characterized in that: A handle (12) is installed on the top of the connecting ring (11).

5. The device for establishing a screw channel for a pelvic iliac clivus external fixator according to claim 1, characterized in that: A fixing bolt (27) is detachably provided on the side wall of the sleeve one (1), and the end of the fixing bolt (27) contacts the outer side wall of the annular housing two (16).

6. The device for establishing a screw channel for a pelvic iliac clivus external fixator according to claim 1, characterized in that: The bottom of the sleeve 1 (1) is a serrated surface, and the bottom of the sleeve 2 (2) is provided with a plurality of spikes at equal intervals along its circumferential direction.

7. The device for establishing a screw channel for a pelvic iliac clivus external fixator according to claim 1, characterized in that: A through groove (24) is provided in the probe (3) and the hand cone (10) along the length direction, and a probe (25) is arranged in the through groove (24) and can move along the length direction thereof; a placement groove (26) matching the shape of the front end of the probe (25) is provided at the bottom of the probe (3).

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