CN211409323U

CN211409323U - Ball centering multidirectional adjustable rotation radius offset-minimally invasive sacroiliac screw positioning guider

Info

Publication number: CN211409323U
Application number: CN201921848325.XU
Authority: CN
Inventors: 邓迎生; 邓喆尹
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-09-04
Anticipated expiration: 2029-10-30

Abstract

The utility model discloses a multidirectional adjustable turning radius offset of centering ball-wicresoft sacroiliac screw location director, including rectangle main positioning ware, hollow locating lever, horizontal arc regulator, vertical arc regulator and hollow sleeve, rectangle main positioning ware includes the locator body and sets up the horizontal arc sleeve at locator body front end, the upper portion and the lower part of hollow locating lever are cylindric and the lower part diameter is less than the upper portion diameter, horizontal arc regulator includes horizontal arc scale rod and sets up the vertical arc sleeve at horizontal arc scale rod left end, vertical arc regulator includes vertical arc scale rod and sets to the rectangle guide block at vertical arc scale rod rear end, hollow telescopic upper portion is cylindric, the lower part is the taper. The utility model discloses simple structure, low cost, convenient to use does not need the X-ray of multi-angle to see through repeatedly, also need not puncture to the bone in, the location is accurate, stability is strong, has guaranteed the one-time success of guide pin and screw safety implantation.

Description

Ball centering multidirectional adjustable rotation radius offset-minimally invasive sacroiliac screw positioning guider

Technical Field

The utility model belongs to the technical field of medical instrument, a multidirectional adjustable turning radius offset of centering ball-wicresoft sacroiliac screw location director is related to.

Background

The injury of the posterior pelvic ring such as the dislocation of the sacroiliac joint and the fracture around the sacroiliac joint can cause the rotational instability and the vertical instability of the pelvis, and the superior method for realizing the fixation of the posterior pelvic ring is to implant sacroiliac screws in a patient body. In recent years, both clinical and biomechanical studies of pelvic fixation have demonstrated: the sacroiliac screw enters from the posterior lateral aspect of the ilium ala, passes through the sacroiliac joint and enters the middle upper part of the sacrum 1 or sacrum 2 vertebral body, and is a good internal fixation type. The percutaneous minimally invasive sacroiliac screw implantation can effectively reduce intraoperative hemorrhage, operative trauma and various complications, and becomes the first choice of clinical orthopedics doctors.

The technical difficulty of the sacroiliac joint screw is the implantation of a guide pin and a screw, the implantation of the prior sacroiliac joint screw is mostly finished by bare hands under the perspective of a C-arm X-ray machine, and the sacroiliac joint screw has the following defects: 1. in the process of nail placement, multi-angle X-ray repeated perspective is needed, the positioning is inaccurate, the stability is poor, and if a satisfactory fixed position cannot be achieved after multiple attempts, the fixed holding force is greatly reduced due to the damage of the guide pin to the bone structure. 2. Since the screw is fixed across the joint and needs to pass through 3 layers of cortical bone, accurate positioning of the point of insertion is extremely difficult. 3. The sacrum is anatomically tilted backwards, the sacroiliac screw has a certain angle in the transverse plane and the sagittal plane, and the individual difference is large, so the running direction of the screw is difficult to be accurately determined. 4. The length of the screw is preferably such that it does not break through the cortical bone of the contralateral sacrum, which is difficult to determine accurately by fluoroscopy. 5. The anterior part of the screw is adjacent to the iliac vessels, the posterior part of the screw is the cauda equina nerve in the vertebral canal, and the upper part of the screw is the intervertebral disc, so that the screw has slight deviation, not only can not achieve effective fixation, but also is easy to damage important nerves and vessels, and even endangers life. In summary, the insertion of the screw lacks objective criteria in determining the point of insertion, the direction of travel, the length of the screw, etc., and is not possible to succeed at one time, thus being technically very difficult and challenging.

In the existing sacroiliac screw guiding device, a pedicle screw guiding needle must be firstly drilled into a sacral 1 vertebral body, and then the guiding needle of the sacroiliac screw is drilled into the sacroiliac screw in a point-to-point aiming mode through a connecting rod with the radian of pi/2. The device improves the accuracy and the safety of nail placement to a certain extent, but has the following defects: 1. the guide pin of the sacrum 1 pedicle screw must be accurately placed, so that the technical threshold is greatly improved, and the damage to the fractured sacrum is aggravated; if the sacrum 1 pedicle guide needle can not be accurately placed in one time, the fixing strength of the sacrum iliac screw can be greatly reduced by repeated operation. 2. Because the guide pin of the sacroiliac screw takes the direction of the guide pin of the pedicle screw as reference, and the guide pin of the sacroiliac screw has included angles with the sagittal plane and the upper transverse plane of the sacrum and has large individual difference, the included angle between the guide pin of the sacroiliac screw and the guide pin of the pedicle screw is difficult to select before and during the operation; thus, the sacroiliac screw can enter the sacrum, but the direction is not necessarily optimal, nor is the length and fixation strength of the screw necessarily optimal. 3. In the case of sacral pedicle fractures, it cannot be used. 4. Sacroiliac screws cannot be used for sacral 2 and other segments.

In the prior art, a sighting device which only depends on anatomical marks of lumbar vertebrae and pelvis, has no obvious damage to vertebral pedicle, has low technical threshold, can randomly adjust the angle according to individual difference of patients, is simple and convenient to operate and can accurately place the sacroiliac screw guide pin at one time is lacked.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a multidirectional adjustable turning radius of centering sphere offset-wicresoft's sacroiliac screw location director combines together rectangle owner locator, horizontal arc regulator and vertical arc regulator, can realize confirming the function of advancing the nail point, adjusting the sacroiliac screw and putting into the direction and can once only accurately put into the sacroiliac screw according to the different state of an illness of patient, solves the problem that prior art exists. The top of the transverse arc-shaped sleeve is downwards inclined so as to adjust the circle center of the longitudinal arc-shaped adjuster to be a virtual rotation sphere center O point in a matching way, so that a doctor can adjust the scales on the transverse and longitudinal arc-shaped scale rods inserted into the transverse and longitudinal arc-shaped slide ways according to different disease conditions of a patient so as to determine the inserting direction of the sacroiliac screw.

In order to achieve the above purpose, the utility model adopts the technical proposal that:

a ball centering multidirectional adjustable rotation radius offset-minimally invasive sacroiliac screw positioning guider comprises a rectangular main positioner, a hollow positioning rod, a transverse arc adjuster, a longitudinal arc adjuster and a hollow sleeve;

the rectangular main positioner comprises a positioner body and a transverse arc-shaped sleeve arranged at the front end of the positioner body. The rectangular main positioner is fixed on the ilium through the ilium fixing holes, and the sacrum positioning holes and the ilium fixing holes are provided with locking members. The connecting block is arranged at the connecting position of the positioner body and the transverse arc sleeve, and the top of the transverse arc sleeve connected with the connecting block is inclined downwards. The transverse arc-shaped sleeve is provided with a left and right transparent transverse arc-shaped slide way, the top of the transverse arc-shaped slide way is parallel to the top of the transverse arc-shaped sleeve, and the transverse arc-shaped slide way is provided with a locking component.

The upper part and the lower part of the hollow positioning rod are both cylindrical, the diameter of the lower part of the hollow positioning rod is smaller than that of the upper part of the hollow positioning rod, a detachable connected threaded guide pin is arranged in the hollow positioning rod, the top of the threaded guide pin is a cylinder, threads are arranged below the cylinder and on the outer side of the guide pin, and the hollow positioning rod can be movably inserted into the sacrum positioning hole and can be locked by a locking component on the sacrum positioning hole. The hollow positioning rod is matched with the thread guide pin to be inserted into a sacrum positioning hole on the positioner body to penetrate into the skin, the tip end of the hollow positioning rod is tightly attached to the outer side of an upper articular process of a first sacrum, which is sunken on the cortical bone surface (the point where the hollow positioning rod is tightly attached is A point) or the bone surface of other key anatomical marks, and the thread guide pin can be screwed into the sacrum to stabilize the hollow positioning rod and can also not be screwed into the sacrum. Avoiding cumbersome and risky procedures that must rely on pedicle screws of the sacrum as a reference. A virtual straight line which is parallel to the sagittal plane and vertically enters the sacrum downwards is made through the point A, the point O (the point O is the virtual rotating sphere center) is selected at a certain distance below the point A on the virtual straight line, the distance from the point A to the point O is the offset distance, and the offset distance can be set by adjusting the scale on the hollow positioning rod inserted into the sacrum positioning hole during the operation. And in turn, the precise location of the virtual sphere of rotation O point (also the point through which the sacroiliac screw and guide pin must pass) within the sacrum.

The horizontal arc regulator comprises a horizontal arc scale rod and a longitudinal arc sleeve arranged at the left end of the horizontal arc scale rod. Be equipped with L type connecting rod crouches in horizontal arc scale rod and the telescopic junction of vertical arc, L type connecting rod crouches includes stock and quarter butt, and the stock is parallel with vertical arc scale rod, and the end of stock is connected with the front end of the bottom of horizontal arc scale rod, and the quarter butt is parallel with horizontal arc scale rod, and the end and the telescopic top of vertical arc of quarter butt are connected. Be equipped with the scale on horizontal arc scale rod, be equipped with the front and back penetrating vertical arc slide on vertical arc sleeve, be equipped with locking member on the vertical arc slide, horizontal arc scale rod passes horizontal arc sleeve and horizontal arc scale rod can slide in horizontal arc sleeve, can freely adjust the scale on the horizontal arc scale rod of the horizontal arc slide of inserting horizontal arc sleeve according to patient's anatomical structure and different state of an illness in order to match the contained angle of sacroiliac screw and human sagittal plane on the cross section, and make the extension line of sacroiliac screw nail way pass through virtual rotatory centre of sphere O point to the interior inclination of accurate definite sacroiliac screw.

The longitudinal arc regulator comprises a longitudinal arc scale rod and a rectangular guide block arranged at the rear end of the longitudinal arc scale rod, scales are arranged on the longitudinal arc scale rod, an opening sliding chute which is through from left to right and is opened downwards is arranged on the rectangular guide block, a locking member is arranged on the opening sliding chute, the longitudinal arc scale rod penetrates through the longitudinal arc sleeve, the longitudinal arc scale rod can slide in the longitudinal arc sleeve, the scales on the longitudinal arc scale rod inserted into the longitudinal arc sliding chute of the longitudinal arc sleeve can be freely adjusted according to the anatomical structure and different disease conditions of a patient to match the included angle between a sacroiliac screw and the plane above the sacrum on the coronal plane, and the extension line of the sacroiliac screw nail path passes through a virtual rotation sphere center O point, so that the inclination angle of the cephalic side or the caudal side of the sacroiliac screw can be accurately determined, and the imbedding direction of the sacr. The downward inclination of the top of the transverse arc-shaped sleeve is used for matching with the adjustment of the circle center of the longitudinal arc-shaped adjuster to a virtual rotation sphere center O point, so that a doctor can adjust the scales on the transverse arc-shaped scale rod and the longitudinal arc-shaped scale rod which are inserted into the transverse arc-shaped slide way and the longitudinal arc-shaped slide way according to different disease conditions of a patient so as to determine the embedding direction of the sacroiliac screw.

The upper part of the hollow sleeve is cylindrical, the lower part of the hollow sleeve is conical, and the hollow sleeve is movably inserted into the opening sliding groove of the rectangular guide block and can be locked by the locking component on the opening sliding groove. The hollow sleeve is used for being inserted into the opening sliding groove to reach the rear outer side of the ilium wing to play a role in positioning and guiding, and the extension line of the insertion direction of the hollow sleeve passes through the O point of the rotating sphere center.

The further technical scheme is that the sacrum positioning holes in the positioner body are positioned on the inner side of the ilium fixing holes, the number of the ilium fixing holes is four, the ilium fixing holes are longitudinally arranged, and only one sacrum positioning hole is arranged. The four iliac fixation holes are designed to allow the use of iliac fixation holes in different positions depending on the patient's condition, and one sacral locating hole is designed to allow the use of cortical bone or other critical anatomical landmarks recessed outside the superior articular process of the first sacrum as a reference point for location.

The technical scheme is that the locator body is further provided with a left square connecting hole and a right square connecting hole which are through, and the square connecting holes are provided with locking components.

The technical scheme is that the radian of the transverse and longitudinal arc-shaped scale rods has various specifications to be selected.

The technical scheme is that the inner surface of the cylindrical upper part of the hollow positioning rod is provided with threads, and the outer surface of the hollow positioning rod is provided with scales.

The technical scheme is that the plane of the transverse arc-shaped scale rod is vertical to the plane of the longitudinal arc-shaped scale rod; and the horizontal arc-shaped scale rod and the longitudinal arc-shaped scale rod have the same rotating radius and the common sphere center.

Further technical scheme is, still include offside fixing device, offside fixing device includes fixed block and screw thread nail, and the fixed block divide into haplopore fixed block and diplopore fixed block, is equipped with on the haplopore fixed block about penetrating square connecting hole and upper and lower penetrating ilium fixed orifices, all is equipped with locking member on square connecting hole and ilium fixed orifices, is equipped with about penetrating and two square connecting holes penetrating around with on the diplopore fixed block, is equipped with locking member on controlling penetrating, two square connecting holes penetrating around.

The further technical scheme is that the number of the single-hole fixing blocks is two, the number of the double-hole fixing blocks is one, and the number of the threaded nails is two. The screw can pass the ilium fixed orifices on the haplopore fixed block and drill into on the contralateral ilium and be locked by the locking member of ilium fixed orifices, play the effect of fixed contralateral fixing device.

The technical scheme is that the positioner comprises a positioner body, and is characterized by further comprising a transverse square connecting rod and a longitudinal square connecting rod, wherein one end of the transverse square connecting rod is connected with a square connecting hole in the positioner body, the other end of the transverse square connecting rod penetrates through the square connecting hole in the first single-hole fixing block to be connected with left and right through square connecting holes in the double-hole fixing block and is locked by a locking component in the three square connecting holes, one end of the longitudinal square connecting rod is connected with the front and back through square connecting holes in the double-hole fixing block, the other end of the longitudinal square connecting rod is connected with the square connecting hole in. The transverse and longitudinal square connecting rods are used for connecting the positioner body and the opposite side fixing device, and the function of stabilizing the rectangular main positioner is achieved.

The further technical scheme is that the locking component is divided into a locking hole and a locking bolt detachably connected with the locking hole.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses simple structure, low cost, convenient to use.

2. The utility model discloses the X-ray that does not need the multi-angle is perspected repeatedly, also need not puncture to the bone in, the location is accurate, stability is strong, has guaranteed the one-time success that guide pin and screw were implanted safely.

3. The hollow positioning rod is matched with the thread guide pin to penetrate into skin, the tip end of the hollow positioning rod is tightly attached to the outer side of the upper articular process of the first sacrum and is sunken on cortical bone or the surface of bone of other key anatomical marks, and the thread guide pin can be screwed into the sacrum to stabilize the hollow positioning rod and can also not be screwed into the sacrum. Avoiding cumbersome and risky procedures that must rely on pedicle screws of the sacrum as a reference.

4. The use of the transverse arc adjuster enables a doctor to freely adjust the scales on the transverse arc scale rod inserted into the transverse arc slide way according to the anatomical structure and different disease conditions of a patient so as to match the included angle between the sacroiliac screw and the sagittal plane of a human body on the transverse section and enable the extension line of the sacroiliac screw nail track to pass through the virtual rotation sphere center O point, so that the internal inclination angle of the sacroiliac screw can be accurately determined.

5. The use of the longitudinal arc adjuster allows the surgeon to freely adjust the scale on the longitudinal arc scale rod inserted into the longitudinal arc slide according to the anatomy and different conditions of the patient to match the angle between the sacroiliac screw and the plane above the sacrum on the coronal plane and to pass the extension line of the sacroiliac screw trajectory through the virtual rotation sphere center O point, so as to accurately determine the cephalad or caudal tilt angle of the sacroiliac screw and determine the direction of insertion of the sacroiliac screw.

6. The top of the transverse arc-shaped sleeve is downwards inclined so as to adjust the circle center of the longitudinal arc-shaped adjuster to be a virtual rotation sphere center O point in a matching way, so that a doctor can adjust the scales on the transverse and longitudinal arc-shaped scale rods inserted into the transverse and longitudinal arc-shaped slide ways according to different disease conditions of a patient so as to determine the inserting direction of the sacroiliac screw.

Drawings

Fig. 1 is a schematic view of the combined structure of the rectangular main positioner, the horizontal arc adjuster and the vertical arc adjuster of the present invention.

Fig. 2 is a schematic structural diagram of the rectangular main positioner of the present invention.

Fig. 3 is a left side view of the rectangular main positioner of the present invention.

Fig. 4 is a schematic structural diagram of the transverse arc adjuster of the present invention.

Fig. 5 is a schematic structural diagram of the longitudinal arc adjuster of the present invention.

Fig. 6 is a schematic structural view of the opposite side fixing device of the present invention.

Fig. 7 is a schematic structural diagram of the hollow sleeve, the hollow positioning rod and the threaded guide pin of the present invention.

Fig. 8 is a usage state diagram of the present invention.

Fig. 9 is a partially enlarged view of region B in fig. 8.

In the figure: 1. a locator body; 2. a sacral locating hole; 3. a hollow positioning rod; 4. a threaded guide pin; 5. an ilium fixation hole; 6. a threaded nail; 7. connecting blocks; 8. a locking hole; 9. a transverse arcuate sleeve; 10. a transverse arc-shaped scale bar; 11. locking the bolt; 12. a hollow sleeve; 13. an open chute; 14. a rectangular guide block; 15. a longitudinal arc-shaped scale bar; 16. a longitudinal arcuate sleeve; 17. a longitudinal arcuate chute; 18. the ilium; 19. a sacrum; 20. a transverse arc-shaped slideway; 21. a square connecting hole; 22. a transverse square connecting rod; 23. a double-hole fixing block; 24. a single-hole fixing block; 25. a longitudinal square connecting rod.

Detailed Description

In order to better understand the technical content of the present invention, the following embodiments are provided, and the present invention is further described with reference to the accompanying drawings.

As shown in fig. 1 to 9, the minimally invasive sacroiliac screw positioning guider with centering sphere and multi-directional adjustable rotation radius offset provided by the utility model comprises a rectangular main positioner, a hollow positioning rod 3, a transverse arc adjuster, a longitudinal arc adjuster and a hollow sleeve 12;

the rectangular main positioner comprises a positioner body 1 and a transverse arc-shaped sleeve 9 arranged at the front end of the positioner body 1. The upper and lower through sacrum positioning holes 2 and the ilium fixing holes 5 are arranged on the positioner body, the sacrum positioning holes 2 are used for being inserted by the guide pins and guiding the guide pins, and the rectangular main positioner can be fixed on the ilium 18 through the ilium fixing holes 5 through the threaded screws 6. The sacrum positioning holes 2 on the positioner body are positioned on the inner side of the ilium fixing holes 5, the number of the ilium fixing holes 5 is four, the ilium fixing holes are longitudinally arranged, and only one sacrum positioning hole 2 is arranged. The four iliac fixation holes 5 are designed to use the iliac fixation holes 5 at different positions according to different conditions of the patient, and one sacral locating hole 2 is designed to use the depressed cortical bone or other critical anatomical landmarks outside the superior articular process of the first sacrum as a reference point for the location. Locking components are arranged on the sacrum positioning hole 2 and the ilium fixing hole 5, and the locking components are locking holes 8 and locking bolts 11 detachably connected with the locking holes 8. Locking holes 8 in the sacrum positioning hole 2 and the ilium fixing hole 5 are located on the positioner body 1, two locking holes 8 are arranged in each sacrum positioning hole 2 and each ilium fixing hole 5, the locking holes 8 in the sacrum positioning hole 2 are located on the right side of the positioner body 1, the locking holes 8 in the ilium fixing hole 5 are located on the left side of the positioner body 1, and the guide pin can be locked by screwing the locking bolts 11 from the outside during use. The connecting block 7 is arranged at the connecting position of the positioner body 1 and the transverse arc-shaped sleeve 9, and the top of the transverse arc-shaped sleeve 9 connected with the connecting block 7 is inclined downwards. The transverse arc-shaped sleeve 9 is provided with a left and right through transverse arc-shaped slide way 20, the top of the transverse arc-shaped slide way 20 is parallel to the top of the transverse arc-shaped sleeve 9, the transverse arc-shaped slide way 20 is provided with a locking component, and a locking hole 8 of the locking component is positioned on the transverse arc-shaped sleeve 9 and can be screwed in from the outside for locking by using a locking bolt 11 during use. The locator body 1 is also provided with a square connecting hole 21 which is through from left to right, and the square connecting hole 21 is provided with a locking component.

The upper portion and the lower part of hollow locating lever 3 are cylindricly and the lower part diameter is less than the upper portion diameter, are equipped with detachable connected screw thread guide pin 4 in hollow locating lever 3, and the cylindric upper portion internal surface of hollow locating lever 3 is equipped with the screw thread, and the surface is equipped with the scale, and screw thread guide pin 4 top is the cylinder, is equipped with the screw thread in the below of cylinder, the outside of guide pin, and hollow locating lever 3 can the activity insert sacrum locating hole 2 and can be locked by the locking component on the sacrum locating hole 2. The hollow positioning rod 3 is inserted into the sacrum positioning hole 2 on the positioner body 1 to penetrate into the skin in cooperation with the threaded guide pin 4, the tip of the hollow positioning rod 3 is closely attached to the outer side of the upper articular process of the first sacrum 19 on the surface of the cortical bone (the point where the hollow positioning rod is closely attached is point A) or the surface of the bone of other key anatomical signs, and the threaded guide pin 4 can be screwed into the sacrum 19 to stabilize the hollow positioning rod 3 and can also be screwed into the sacrum 19. Cumbersome and risky procedures that must rely on pedicle screws of the sacrum 19 as a reference are avoided. A virtual straight line which is parallel to the sagittal plane and vertically enters the inside of the sacrum downwards is made through the point A, the point O (the point O is the rotating sphere center) is selected at a certain distance below the point A on the virtual straight line, the distance from the point A to the point O is the offset distance, the offset distance can be set by adjusting the scale on the hollow positioning rod 3 inserted into the sacrum positioning hole 2 during the operation, and the accurate position of the virtual rotating sphere center O point (also the point through which the sacroiliac screw and the guide pin must pass) in the sacrum 19 is further determined.

The transverse arc adjuster comprises a transverse arc scale bar 10 and a longitudinal arc sleeve 16 arranged at the left end of the transverse arc scale bar 10. Be equipped with L type connecting rod crouches in horizontal arc scale bar 10 and vertical arc sleeve 16's junction, L type connecting rod crouches includes stock and quarter butt, and the stock is parallel with vertical arc sleeve 16, and the radian is unanimous, and the end of stock is connected with the front end of the bottom of horizontal arc scale bar 10, and the quarter butt is parallel with horizontal arc scale bar 10, and the radian is unanimous, and the end of quarter butt is connected with vertical arc sleeve 16's top. The scale is arranged on the transverse arc scale rod, the longitudinal arc slide way 17 which is through from front to back is arranged on the longitudinal arc sleeve 16, the locking component is arranged on the longitudinal arc slide way 17, the locking hole 8 of the locking component is positioned on the longitudinal arc sleeve 16, and the locking bolt 11 can be screwed in from the outside to lock when in use. The arc-shaped scale rod 10 penetrates through the transverse arc-shaped sleeve 16, the transverse arc-shaped scale rod 10 can slide in the transverse arc-shaped sleeve 16, and scales on the transverse arc-shaped scale rod 10 inserted into a transverse arc-shaped slide way 20 of the transverse arc-shaped sleeve 16 can be freely adjusted according to the anatomical structure and different disease conditions of a patient to match the included angle between the sacroiliac screw and the sagittal plane of a human body on the transverse section and enable the extension line of the sacroiliac screw nail track to pass through a virtual rotation sphere center O point so as to accurately determine the internal inclination angle of the sacroiliac screw.

The longitudinal arc regulator comprises a longitudinal arc scale rod 15 and a rectangular guide block 14 arranged at the rear end of the longitudinal arc scale rod 15, scales are arranged on the longitudinal arc scale rod 15, an opening sliding groove 13 which is through from left to right and is open downwards is formed in the rectangular guide block 14, a locking component is arranged on the opening sliding groove 13, a locking hole 8 of the locking component is located on the rectangular guide block 14, and the locking bolt 11 can be screwed in from the outside to lock the locking component during use. The radian of the longitudinal arc-shaped scale rod 15 is consistent with that of the transverse arc-shaped scale rod 10. The longitudinal arc-shaped scale rod 15 penetrates through the longitudinal arc-shaped sleeve 16, the longitudinal arc-shaped scale rod 15 can slide in the longitudinal arc-shaped sleeve 16, and scales on the longitudinal arc-shaped scale rod 15 inserted into the longitudinal arc-shaped slide way 17 can be freely adjusted according to the anatomical structure and different disease conditions of a patient to match the included angle between the sacroiliac screw and the plane above the sacrum 19 on the coronal plane and enable the extension line of the sacroiliac screw nail track to pass through the virtual rotation sphere center O point, so that the inclination angle of the cephalad side or the caudal side of the sacroiliac screw can be accurately determined, and the inserting direction of the sacroiliac screw can be determined. The plane of the transverse arc-shaped scale rod 10 is vertical to the plane of the longitudinal arc-shaped scale rod 15; and the transverse arc-shaped scale rod 10 and the longitudinal arc-shaped scale rod 15 have the same rotating radius and the same common sphere center. The top of the transverse arc-shaped sleeve 9 is downwards inclined so as to match with the circle center of the longitudinal arc-shaped adjuster to be adjusted to a virtual rotating sphere center O point, so that a doctor can adjust the scales on the transverse arc-shaped scale rod 10 and the longitudinal arc-shaped scale rod 15 which are inserted into the transverse arc-shaped slide way 10 and the longitudinal arc-shaped slide way 17 according to different disease conditions of a patient so as to determine the inserting direction of the sacroiliac screw.

The upper part of the hollow sleeve 12 is cylindrical, the lower part is conical, and the hollow sleeve 12 is movably inserted into the opening sliding groove 13 of the rectangular guide block 14 and can be locked by the locking component on the opening sliding groove 13. The hollow sleeve 12 is used for being inserted into the opening sliding groove 13 to reach the rear outer side of the ilium 18 wing to play a role in positioning and guiding, and the extension line of the insertion direction of the hollow sleeve passes through the rotating spherical center O point.

The fixing device comprises a fixing block and a threaded nail 6, and the fixing block is divided into a single-hole fixing block 24 and a double-hole fixing block 23. Two single-hole fixing blocks 24, two double-hole fixing blocks 23 and two screw nails 6 are provided. The single-hole fixing block 24 is provided with a left-right through square connecting hole 21 and an upper-lower through iliac fixing hole 5, the square connecting hole 21 and the iliac fixing hole 5 are both provided with locking members, the locking holes 8 of the two locking members are both positioned on the single-hole fixing block 24, and the locking bolts 11 can be screwed in from the outside to be locked during use. Two square connecting holes which are through from left to right and through from front to back are formed in the double-hole fixing block, locking members are arranged on the two square connecting holes which are through from left to right and through from front to back, the locking holes 8 of the two locking members are located on the double-hole fixing block 23, and the locking bolts 11 can be screwed in from the outside to lock in use. The screw 6 can pass through the ilium fixing hole 5 on the single-hole fixing block 24 and drill into the opposite side ilium 18 and is locked by the locking component of the ilium fixing hole 5, so as to play a role in fixing the opposite side fixing device.

Still include horizontal square connecting rod 22 and vertical square connecting rod 25, the contained angle of horizontal square connecting rod 22 and vertical square connecting rod 25 becomes 90 contained angles, the one end of horizontal square connecting rod 22 is connected with square connecting hole 21 on the locator body 1, the other end passes square connecting hole 21 of first piece haplopore fixed block 24 and is connected with the left and right sides through square connecting hole 21 of diplopore fixed block 23, and be locked by the locking member on the three square connecting hole 21, vertical square connecting rod 25 one end is connected with the front and back through square connecting hole 21 of diplopore fixed block 23, the other end is connected with the square connecting hole 21 of second piece haplopore fixed block, and be locked by the locking member on two square connecting hole 21. The transverse and longitudinal square connecting rods are used for connecting the positioner body 1 and the opposite side fixing device, and the function of stabilizing the rectangular main positioner is achieved.

The working principle of the utility model is as follows:

before an operation, a patient is in a prone position, the upper surface of a sacrum 19 is perpendicular to the ground, then a grid-shaped positioner is placed at the lumbosacral part, the sacrum 19 is positioned in a perspective mode, a point on the surface of a depressed bone on the outer side of an articular process on the sacrum 19 is determined and is called as an A point, a virtual straight line which is parallel to a sagittal plane and vertically enters the sacrum downwards is made through the A point, a position with a certain distance below the A point is selected to be an O point on the virtual straight line (the distance from the A point to the O point is an offset distance, the position can be determined through CT measured data before the operation and is realized by adjusting scales on a hollow positioning rod 3), the O point is used as a virtual sphere center, and a proper rotation radius is selected on a backward extension line of an. Before the operation, the included angle alpha between the nail path and the sagittal plane is determined according to CT measurement data.

In the operation process, puncture is carried out in a vertical horizontal plane, a hollow positioning rod 3 reaches cortical bone at the point A, a thread guide pin 4 is inserted into the hollow positioning rod 3 and is screwed into cortical bone at the point A of a sacrum 19, a sacrum positioning hole 2 of a rectangular main positioner is sleeved on the hollow positioning rod 3, the hollow positioning rod 3 is locked by a locking hole 8 and a locking bolt 11 on the sacrum positioning hole 2 to fix the rectangular main positioner, different ilium fixing holes 5 on a positioner body 1 are selected according to different illness states of a patient, a screw 6 is inserted into the ilium fixing hole 5 and is drilled into an ilium 18, a locking component on the ilium fixing hole 5 is used for locking the screw 6 to stabilize the rectangular main positioner, and finally a transverse square connecting rod 22 is used for connecting the rectangular main positioner with an opposite side fixing device through a square connecting hole 21 on the positioner body 1 and a square connecting hole 21 of the opposite side fixing device, the stability of the rectangular main positioner is improved.

Since the rotation offset (i.e. the distance from the rotation center O to the cortical surface at a point) and the included angle α between the nail track and the sagittal plane are determined before the operation, the transverse arc-shaped graduated rod 10 of the transverse arc-shaped adjuster is inserted into the transverse arc-shaped slideway 20 of the transverse arc-shaped sleeve 9 which is inclined forwards and inwards, the abduction angle of the transverse arc-shaped adjuster is adjusted to α according to the scale on the transverse arc-shaped graduated rod 10, and the transverse arc-shaped slideway 20 on the transverse arc-shaped sleeve 9 is locked by the locking member. The longitudinal arc scale rod 15 of the longitudinal arc adjuster is inserted into the longitudinal arc slideway 17 of the longitudinal arc sleeve 16 of the transverse arc adjuster and locked by the locking component of the longitudinal arc slideway 17 on the longitudinal arc sleeve 16. Finally, the hollow sleeve 12 is inserted into an opening sliding groove 13 of a rectangular guide block 14 of the longitudinal arc-shaped adjuster, the tip of the hollow sleeve 12 reaches the cortex of the back outer side of the ilium 18 wing, the extension line of the tip passes through a point O, the hollow sleeve 12 is locked by a locking component on the opening sliding groove 13, a guide pin is inserted into the hollow sleeve 12 and is confirmed again through the perspective of a C-arm X-ray machine, the guide pin drills into the outer cortex of the ilium 18 and the sacrum 19 through the hollow sleeve 11, the position of the hollow sleeve 12 is maintained after the guide pin enters 30-40mm, the guide pin is withdrawn, and the route opener is replaced.

And (3) continuously opening the way by using the opener, selecting a proper limit resistance gear, and enabling the opener to advance in the sacrum 19 and pass through the point O in the advancing process until reaching the opposite cortical bone of the sacrum 19, so that the right side of the sacrum 19 can be seen through, the depth can be measured, and the sacroiliac screw with proper length and diameter can be screwed in.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a fixed ball center multidirectional adjustable turning radius offset-wicresoft sacroiliac screw location director which characterized in that: the device comprises a rectangular main positioner, a hollow positioning rod, a transverse arc regulator, a longitudinal arc regulator and a hollow sleeve;

the rectangular main positioner comprises a positioner body and a transverse arc-shaped sleeve arranged at the front end of the positioner body, the positioner body is provided with a sacrum positioning hole and an ilium fixing hole which are through up and down, and the sacrum positioning hole and the ilium fixing hole are both provided with locking members;

the upper part and the lower part of the hollow positioning rod are both cylindrical, the diameter of the lower part is smaller than that of the upper part, a detachably connected threaded guide pin is arranged in the hollow positioning rod, and the hollow positioning rod can be movably inserted into the sacrum positioning hole and can be locked by a locking component on the sacrum positioning hole;

the transverse arc regulator comprises a transverse arc scale rod and a longitudinal arc sleeve arranged at the left end of the transverse arc scale rod; the transverse arc-shaped scale rod penetrates through the transverse arc-shaped sleeve and can slide in the transverse arc-shaped sleeve;

the longitudinal arc-shaped adjuster comprises a longitudinal arc-shaped scale rod and a rectangular guide block arranged at the rear end of the longitudinal arc-shaped scale rod; the longitudinal arc-shaped scale rod penetrates through the longitudinal arc-shaped sleeve and can slide in the longitudinal arc-shaped sleeve;

the upper part of the hollow sleeve is cylindrical, the lower part of the hollow sleeve is conical, and the hollow sleeve is movably inserted into the rectangular guide block.

2. The centering multi-way adjustable radius of rotation offset-minimally invasive sacroiliac screw positioning guide as defined in claim 1, wherein: the sacrum positioning holes on the positioner body are positioned on the inner side of the ilium fixing holes, the number of the ilium fixing holes is four, the ilium fixing holes are longitudinally arranged, and only one sacrum positioning hole is arranged.

3. The centering multi-way adjustable radius of rotation offset-minimally invasive sacroiliac screw positioning guide as defined in claim 1, wherein: the locator body is also provided with a square connecting hole which is through from left to right, and the square connecting hole is provided with a locking component.

4. The centering multi-way adjustable radius of rotation offset-minimally invasive sacroiliac screw positioning guide as defined in claim 1, wherein: the radians of the transverse arc-shaped scale rod and the longitudinal arc-shaped scale rod are provided with various specifications for selection.

5. The centering multi-way adjustable radius of rotation offset-minimally invasive sacroiliac screw positioning guide as defined in claim 1, wherein: the inner surface of the cylindrical upper part of the hollow positioning rod is provided with threads, and the outer surface of the hollow positioning rod is provided with scales.

6. The centering multi-way adjustable radius of rotation offset-minimally invasive sacroiliac screw positioning guide as defined in claim 1, wherein: the plane of the transverse arc-shaped scale rod is vertical to the plane of the longitudinal arc-shaped scale rod; and the horizontal arc-shaped scale rod and the longitudinal arc-shaped scale rod have the same rotating radius and the common sphere center.

7. The centering multi-way adjustable radius of rotation offset-minimally invasive sacroiliac screw positioning guide as defined in claim 1, wherein: still include offside fixing device, offside fixing device includes fixed block and screw thread nail, and the fixed block divide into haplopore fixed block and diplopore fixed block, is equipped with about on the haplopore fixed block penetrating square connecting hole and upper and lower penetrating ilium fixed orifices, all is equipped with locking member on square connecting hole and ilium fixed orifices, controls penetrating and two front and back penetrating square connecting holes about being equipped with on the diplopore fixed block, is equipped with locking member on controlling penetrating, front and back penetrating two square connecting holes.

8. The centering multi-way adjustable radius of rotation offset-minimally invasive sacroiliac screw positioning guide as defined in claim 7, wherein: the single-hole fixing blocks are two, the double-hole fixing blocks are one, the threaded nails are two, and the threaded nails can penetrate through the ilium fixing holes in the single-hole fixing blocks, drill into the opposite ilium and are locked by the locking members in the ilium fixing holes.

9. The centering multi-way adjustable radius of rotation offset-minimally invasive sacroiliac screw positioning guide as defined in claim 1, wherein: still include horizontal square connecting rod and vertical square connecting rod, the one end of horizontal square connecting rod is connected with the square connecting hole on the locator body, the other end passes the square connecting hole of first haplopore fixed block and the penetrating square connecting hole of controlling of diplopore fixed block is connected, and by the locking member locking on the three square connecting hole, vertical square connecting rod one end is connected with the penetrating square connecting hole around the diplopore fixed block, the other end is connected with the square connecting hole of second haplopore fixed block, and by the locking member locking on two square connecting holes.

10. The centering multi-way adjustable radius of rotation offset-minimally invasive sacroiliac screw positioning guide as defined in claim 1, wherein: the locking member is divided into a locking hole and a locking bolt detachably connected with the locking hole.