CN115607280B - Calibrating plate fixing device - Google Patents

Abstract

The invention relates to a calibration plate fixing device, which solves the technical problems that in the existing spine and bone trauma magnetic navigation operation system, when a mobile C-arm X-ray machine shoots CT images, a correction plate is stuck below an X-ray emission source in the mobile C-arm X-ray machine by using an adhesive tape, the operation is troublesome and the positioning is inaccurate, a space positioner is fixed on a bracket supported on the ground, the operation is inconvenient when the bracket is moved to adjust the position of the space positioner, the time consumption is long, the efficiency is low, and the positioning is inaccurate; the correction plate positioning device is connected with the flat plate.

Description

Calibrating plate fixing device

Technical Field

The invention relates to the technical field of magnetic navigation surgery systems, in particular to a calibration plate fixing device.

Background

The magnetic navigation operation system for spinal and bone injuries is a novel operation treatment scheme for treating surgical diseases of spinal and bone injuries, and can help doctors to finish various surgical operations more excellently. For example, in an orthopedic operation robot, referring to the chinese invention application with application publication number CN112716603a and the invention patent with patent number 201310700436.7, in the operation process of the reduction of the leg fracture, a magnetic navigation system can be utilized to reconstruct a CT or MRI two-dimensional image of the leg bone in three dimensions, a three-dimensional model of the leg bone is established, a probe and a six-degree-of-freedom reference tool are utilized to position the leg bone, association of the leg bone and the three-dimensional model is completed, when the leg bone moves, the three-dimensional model also moves relatively, and the reduction condition of the leg bone can be reflected by observing the reduction condition of the three-dimensional model of the leg bone, thereby completing the reduction of the leg bone fracture. The magnetic navigation system can greatly reduce the risk of complex bone surgery, the bone surgery utilizes the navigation system to make a surgery plan before surgery and navigate in surgery, can track surgical instruments in the surgery process, and update and display the positions of the surgical instruments on images before or during surgery of a patient in real time, so that a doctor can know the relationship between the positions of the surgical instruments and the anatomy structure of the patient at any time, and navigation assistance is obtained, so that the surgery process is more accurate.

Referring to the application publication number CN114748084A, the name is Chinese patent application affecting the mobile C-arm for guiding the treatment system, and the patent issued by the patent publication number CN217488682U, when the existing mobile C-arm X-ray machine shoots CT images, a correction plate and a space positioner (for the function of the space positioner, the application publication number CN112190333A can be referred to), and the correction plate is stuck under an X-ray emission source in the mobile C-arm X-ray machine by using an adhesive tape, so that the problems of troublesome operation and inaccurate positioning exist; the correction plate is provided with a plurality of steel balls, the space positioner is also provided with a plurality of steel balls, the space positioner and the correction plate are matched for use, the space positioner and the correction plate are arranged relatively, a patient bone is positioned below the space positioner, two imaging images of the right position and the side position of the patient bone are shot, the positions of the steel balls on the correction plate and the space positioner are used as the basis, three-dimensional images of the bone to be shot are formed on the equipment for registering, three-dimensional image basis is provided for subsequent operation, and the doctor operation is facilitated. The positioning of the space positioner is performed through another support, the support is supported on the ground, the support is moved to adjust the position of the space positioner so as to be matched with the correction plate, and the positioning process of the space positioner is inconvenient to operate, long in time consumption, low in efficiency and inaccurate in positioning.

Disclosure of Invention

The invention aims to solve the technical problems that in the existing spine and bone trauma magnetic navigation surgery system, when a mobile C-arm X-ray machine shoots CT images, a correction plate is stuck below an X-ray emission source in the mobile C-arm X-ray machine by using an adhesive tape, the operation is troublesome, the positioning is inaccurate, a space positioner is fixed on a support supported on the ground, the operation is inconvenient when the support is moved to adjust the position of the space positioner, the time consumption is long, the efficiency is low, and the positioning is inaccurate.

The invention provides a calibration plate fixing device which comprises a flat plate, a telescopic mechanism, a space locator clamp, a calibration plate positioning device, a locking device, a first clamping piece assembly and a second clamping piece assembly, wherein the telescopic mechanism is fixedly connected with the bottom surface of the flat plate; the correction plate positioning device is connected with the flat plate;

The first clamping piece assembly comprises a handle, a left clamping plate, a right clamping plate, a rear clamping plate, a right corner connecting piece, a left corner connecting piece, a rear sliding plate I, a rear sliding plate II, a left end sliding plate and a right end sliding plate, wherein the handle is fixedly connected with the rear clamping plate;

The second clamping piece assembly comprises a handle, a rear clamping plate, a left clamping plate, a right clamping plate, a left end sliding plate, a right end sliding plate, a rear sliding plate I and a rear sliding plate II, wherein the lower end of the right end sliding plate is provided with a sliding hole, the handle is fixedly connected with the rear clamping plate, the left clamping plate is fixedly connected with the rear clamping plate through a left corner connecting piece, the right clamping plate is fixedly connected with the right end of the rear clamping plate through a right corner connecting piece, the left end sliding plate is fixedly connected with the tail end of the left clamping plate, the lower end of the left end sliding plate is provided with a sliding hole, the right end sliding plate is fixedly connected with the tail end of the right clamping plate, the lower end of the right end sliding plate is provided with a sliding hole, the rear sliding plate I and the rear sliding plate II are respectively fixedly connected with the rear clamping plate, and the lower end of the rear sliding plate I is provided with a sliding hole;

The locking device comprises four unidirectional spring clamp assemblies and two bidirectional spring clamp assemblies; the unidirectional spring clamp assembly comprises a spring, an opening check ring, a guide shaft and a base, wherein the base is provided with an accommodating groove, the rear end of the base is provided with a rear shaft hole, the front end of the base is provided with a front shaft hole, the rear end of the guide shaft is provided with a blocking part, the front end of the guide shaft is provided with a check ring connecting groove, the guide shaft penetrates from the rear shaft hole and then penetrates out of the front shaft hole, the spring is sleeved on the guide shaft, the opening check ring is connected with the check ring connecting groove of the guide shaft, the opening check ring is positioned outside the base, the blocking part is positioned outside the base, the guide shaft and the spring are positioned in the accommodating groove of the base, and the rear end of the spring abuts against the rear wall of the accommodating groove; the base is fixedly connected with the flat plate;

The two bidirectional spring clamp assemblies are respectively a first bidirectional spring clamp assembly and a second bidirectional spring clamp assembly; the first bidirectional spring clamp assembly comprises a base, a left spring, a right spring, a guide shaft and an opening retainer ring, wherein a retainer ring connecting groove is formed in the right end of the guide shaft of the first bidirectional spring clamp assembly, a blocking part is arranged at the left end of the guide shaft, a placing groove is formed in the base of the first bidirectional spring clamp assembly, a left shaft hole is formed in the left end of the base of the first bidirectional spring clamp assembly, a right shaft hole is formed in the right end of the base of the first bidirectional spring clamp assembly, the guide shaft of the first bidirectional spring clamp assembly penetrates through the left shaft hole of the base and then penetrates out of the right shaft hole, the opening retainer ring of the first bidirectional spring clamp assembly is connected with the retainer ring connecting groove of the guide shaft, the guide shaft of the first bidirectional spring clamp assembly is positioned in the placing groove, and the left spring and the right spring are sleeved on the guide shaft in the first bidirectional spring clamp assembly respectively; the base of the first bidirectional spring clamp assembly is fixedly connected with the flat plate; the second bidirectional spring clamp assembly comprises a base, a left spring, a right spring, a guide shaft and an opening retainer ring;

The guide shaft of the first bidirectional spring clamp assembly penetrates through the sliding hole of the right end sliding plate in the second clamping piece assembly, the guide shaft of the first bidirectional spring clamp assembly penetrates through the sliding hole of the left end sliding plate in the first clamping piece assembly, the right spring is positioned between the rear wall of the placing groove and the left end sliding plate of the first clamping piece assembly, and the left spring is positioned between the front wall of the placing groove and the right end sliding plate of the second clamping piece assembly; the left end sliding plate of the second clamping piece assembly body is sleeved on the guide shaft of the second bidirectional spring clamp assembly body, and the right end sliding plate of the first clamping piece assembly body is sleeved on the guide shaft of the second bidirectional spring clamp assembly body;

The guide shaft in one-way spring clamp assembly penetrates through the sliding hole of the rear sliding plate I in the first clamping piece assembly, and the front end of the spring in the one-way spring clamp assembly abuts against the rear sliding plate I of the first clamping piece assembly; the second back sliding plate of the first clamping piece assembly is connected and matched with the second unidirectional spring clamp assembly, and the first back sliding plate of the second clamping piece assembly is connected and matched with the other two unidirectional spring clamp assemblies respectively;

the flat plate is provided with a round hole for accommodating the correction plate.

Preferably, the correction plate positioning device comprises two first support plates and two first clamping plates, wherein the first support plates are provided with fixing parts, clamping plate connecting parts and correction plate positioning grooves, the fixing parts are provided with screw holes, the clamping plate connecting parts are provided with screw holes, the fixing parts are attached to the bottom surface of the flat plate, and the screws penetrate through the screw holes of the fixing parts and are connected with the bottom surface of the flat plate through screw structures; the two first supporting plates are oppositely arranged, and the first clamping plates are provided with screw holes.

Preferably, the left clamping plate, the right clamping plate and/or the rear clamping plate of the first clamping piece assembly are/is connected with an anti-slip pad.

Preferably, the right clamping plate, the rear clamping plate and/or the left clamping plate of the second clamping plate assembly are/is connected with an anti-slip pad.

Preferably, the correcting plate positioning device further comprises a second supporting plate and a second clamping plate, the second clamping plate is provided with a screw hole, the first supporting plate is provided with a second supporting plate connecting screw hole, the second supporting plate is provided with a splicing groove, a slot, a correcting plate positioning groove and a clamping plate connecting part, the splicing groove is provided with a screw hole, the clamping plate connecting part of the first supporting plate is inserted into the slot of the second supporting plate, the correcting plate positioning groove of the first supporting plate is spliced with the splicing groove of the second supporting plate, and the screw hole on the splicing groove is penetrated by the screw and then connected with the second supporting plate connecting screw hole on the first supporting plate.

Preferably, the telescopic mechanism comprises a first telescopic fixed plate, a second telescopic fixed plate, a butterfly nut and a first knurled hand screw, wherein a through hole is formed in the upper end of the first telescopic fixed plate, the first telescopic fixed plate is provided with a sliding table and a limiting step, the second telescopic fixed plate is provided with a sliding groove and a limiting step, the sliding groove of the second telescopic fixed plate is provided with a screw position adjusting hole, the upper end of the second telescopic fixed plate is provided with a threaded hole, the sliding table of the first telescopic fixed plate is embedded into the sliding groove of the second telescopic fixed plate, the first knurled hand screw penetrates through the screw position adjusting hole after penetrating through the through hole in the upper end of the first telescopic fixed plate, and the butterfly nut is connected with the first knurled hand screw; the flat plate is connected with a threaded hole at the upper end of the second telescopic fixed plate through a screw; the lower end of the first telescopic fixed plate is fixedly connected with the space locator clamp.

Preferably, the space positioner clamp comprises a circular ring part with an opening, a connecting rod part, a first limiting part, a second limiting part and a third limiting part, wherein the connecting rod part is provided with a first waist-shaped hole and a second waist-shaped hole;

the lower end of the first telescopic fixed plate is provided with a first lower threaded hole and a second lower threaded hole, and two knurled hand screws penetrate through the first waist-shaped hole and the second waist-shaped hole of the space locator clamp and are connected with the first lower threaded hole and the second lower threaded hole of the lower end of the first telescopic fixed plate.

The invention has the advantages of simple operation, convenient assembly and disassembly, high-efficiency matching, assistance of doctors to determine the real-time effect of the operation, provision of prepared images for the next operation of the doctors, and high-efficiency and accurate completion of the operation.

Utilize calibration plate fixing device to fix on portable C shape arm X ray machine, can make the doctor carry out CT to patient's operation condition in real time at actual operation in-process and shoot, confirm the operation effect, guarantee the accuracy of operation, assist the doctor to accomplish the operation, reduce the operation risk, improve work efficiency. The invention is matched with an electromagnetic navigation system, and the mechanical arm is controlled to move by the navigation system to perform operation, so that high-precision operation is realized.

Further features of the invention will be apparent from the description of the embodiments that follows.

Drawings

FIG. 1 is a schematic view of the structure of the calibration plate fixing device of the present invention;

FIG. 2 is a top view of the calibration plate fixture of FIG. 1;

FIG. 3 is a bottom view of the alignment plate fixture of FIG. 1;

FIG. 4 is a schematic view of the first clip assembly of FIG. 1;

FIG. 5 is an exploded view of the structure shown in FIG. 4;

FIG. 6 is a schematic view of the construction of the one-way spring clip assembly of FIG. 1;

FIG. 7 is a top view of the structure shown in FIG. 6;

FIG. 8 is an exploded view of the one-way spring clip assembly of FIG. 6;

FIG. 9 is a schematic illustration of the construction of the bi-directional spring clip assembly of FIG. 1;

FIG. 10 is a top view of the structure shown in FIG. 9;

FIG. 11 is an exploded view of the structure shown in FIG. 9;

FIG. 12 is an enlarged partial view of the portion of the bi-directional spring clip assembly of FIG. 1;

FIG. 13 is a schematic view of the structure of FIG. 12 in which the right end slide plate of the second clip assembly is coupled to the bi-directional spring clip assembly;

FIG. 14 is an exploded view of the structure shown in FIG. 13;

FIG. 15 is a schematic view of the structure of FIG. 12 in which the right end slide plate of the second clip assembly is coupled to the bi-directional spring clip assembly;

FIG. 16 is a cross-sectional view taken along the line indicating the direction of the cross-section in FIG. 15;

FIG. 17 is a schematic view of the structure of the second rear slide plate in the first clip assembly in mating engagement with the one-way spring clip assembly;

FIG. 18 is a schematic view of the structure of the first telescoping fixed plate;

FIG. 19 is a schematic view of the structure of a second telescoping fixation plate;

FIG. 20 is a schematic view of the first and second telescoping fixed plates assembled together;

FIG. 21 is a perspective view of the structure of FIG. 20 from another perspective;

FIG. 22 is a schematic structural view of a spatial locator clamp;

FIG. 23 is a schematic view of the structure of the spatial locator clamp fixedly mounted on the first telescoping fixation plate;

Fig. 24 is a schematic structural view of the first support plate;

fig. 25 is a front view of the first support plate of fig. 24;

Fig. 26 is a rear view of the first support plate of fig. 24;

FIG. 27 is a schematic view of the structure of the first clamping plate;

FIG. 28 is a front view of the first clamping plate shown;

FIG. 29 is a schematic view of the structure of FIG. 1 with the 12 inch correction plate and the spatial locator removed;

FIG. 30 is a top view of the structure shown in FIG. 29;

FIG. 31 is a bottom view of the structure shown in FIG. 29;

FIG. 32 is an isometric view of a 12 inch calibration plate;

FIG. 33 is a schematic view of the calibration plate fixture attached to the X-ray machine of the mobile C-arm;

Fig. 34 is an isometric view of the second support plate;

fig. 35 is a front view of the second support plate of fig. 34;

FIG. 36 is a side view of the second support plate of FIG. 34;

Fig. 37 is a rear view of the second support plate of fig. 34;

FIG. 38 is an isometric view of a second clamping plate;

FIG. 39 is a front view of the second clamping plate;

FIG. 40 is a schematic view of the structure of a 9 inch correction plate;

Fig. 41 is a schematic view of a structure in which the second support plate is mounted on the first support plate;

FIG. 42 is a top view of the structure shown in FIG. 41;

FIG. 43 is a bottom view of the structure shown in FIG. 41;

FIG. 44 is a schematic view showing a structure in which a 9-inch correction plate is mounted on two second support plates.

The symbols in the drawings illustrate:

1. A first clamping piece assembly body 1A, a handle 1B, a right clamping plate 1C, a rear clamping plate 1D, a right corner connecting piece 1E, a right tail end sliding plate 1F, an anti-slip pad 1G, a rear sliding plate II, 1H, a left clamping plate, 1K, a left tail end sliding plate, 1K-1, a sliding hole, 1L, a sliding pad, 1M, a sliding pad, 1N, a sliding pad, 1P, a left corner connecting piece and 1R, a rear sliding plate I; 2. the device comprises a first telescopic fixed plate, a first lower threaded hole, a second lower threaded hole, a sliding table and a limiting step, wherein the first telescopic fixed plate is 2-1 of a through hole, 2-2 of a through hole, 2-3 of a lower threaded hole, 2-4 of a sliding table and 2-5 of a limiting step; 3. the second telescopic fixing plate, 3-1, chute, 3-2, limit step, 3-3, screw hole, 3-4, screw position adjusting hole, 4, space locator clamp, 4-1, circular ring part with opening, 4-2 parts of connecting rods, 4-3 parts of waist-shaped holes I, 4-4 parts of waist-shaped holes II, 4-5 parts of first limiting parts, 4-6 parts of second limiting parts and 4-7 parts of third limiting parts; 5. space locator, 6. One-way spring clamp assembly, 6A. Spring, 6B. Split washer, 6℃ Guide shaft, 6D. Base, 7. First clamping plate, 7-1. Screw hole, 8. First support plate, 8-1. Fixed portion, 8-1-1. Screw hole, 8-2. Clamping plate connection portion, 8-2-1. Screw hole, 8-3. Correction plate positioning slot, 8-4. Second support plate connection screw hole, 9.12 inch correction plate, 9-1. Notch, 10. Flat plate, 11.9 inch correction plate, 11-1. Notch, 14. Butterfly nut, 15. First knurled hand screw, 16. Two-way spring clamp assembly, 16-1. Base, 16-1-1. Placement slot, 16-1-2. Left shaft hole, 16-1-3. Right shaft hole, 16-2. Left spring, 16-3. Right spring, 16-4. Guide shaft, 16-4-1. Retainer ring connection slot, 16-4-2. Blocking portion, 16-5. Split washer. 17. The second clamping piece assembly 17-1, a handle, 17-2, a rear clamping plate, 17-3, a left clamping plate, 17-4, a right clamping plate, 17-5, a left end sliding plate, 17-6, a right end sliding plate, 17-6-1, a sliding hole, 18, a second bidirectional spring clamp assembly; 19. the second knurled hand screws, 20, the third knurled hand screws, 21, X-ray emission sources; 22. the second support plate, 22-1 splice groove, 22-1 screw hole, 22-2 slot, 22-3 corrector plate positioning groove, 22-4 clamping plate connecting portion, 23, second clamping plate, 23-1 screw hole.

Detailed Description

The invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1-3, the calibration plate fixing device comprises a flat plate 10, a telescopic mechanism, a space locator clamp 4, a locking device, a calibration plate positioning device, a first clamping piece assembly body 1 and a second clamping piece assembly body 17, wherein the telescopic mechanism is fixedly connected with the bottom surface of the flat plate 10, the space locator clamp is fixedly connected with the lower end of the telescopic mechanism, the locking device is arranged on the top surface of the flat plate 10, and the first clamping piece assembly body 1 and the second clamping piece assembly body 17 are matched with the locking device in two groups. The correction plate positioning device is connected with the flat plate 10 and is used for fixing and positioning the correction plate. The space locator clamp 4 is used for installing and locating the space locator. The first clamping piece assembly 1 and the second clamping piece assembly 17 are arranged oppositely and are used for clamping the X-ray machine of the C-shaped arm.

As shown in fig. 4 and 5, the first clip assembly 1 includes a handle 1A, a left clamping plate 1H, a right clamping plate 1B, a rear clamping plate 1C, a right corner connecting member 1D, a left corner connecting member 1P, a mat 1F, a rear sliding plate 1G, a rear sliding plate 1R, a left end sliding plate 1K, a right end sliding plate 1E, a mat 1L, a mat 1M, and a mat 1N, the handle 1A is fixedly connected with the rear clamping plate 1C by a screw, the left corner connecting member 1P is fixedly connected with the left end of the rear clamping plate 1C by a screw, the left clamping plate 1H is fixedly connected with the left corner connecting member 1P by a screw (i.e., the left clamping plate 1H is fixedly connected with the rear clamping plate 1C by the left corner connecting member 1P), the right corner connecting member 1D is fixedly connected with the right end of the rear clamping plate 1 by a screw, the right clamping plate 1B is fixedly connected with the right corner connecting member 1D by a screw (i.e., the right clamping plate 1B is fixedly connected with the right end of the rear clamping plate 1C by the right corner connecting member 1D), the left end sliding plate 1K is fixedly connected with the tail end of the left clamping plate 1H through a screw, the lower end of the left end sliding plate 1K is provided with a sliding hole 1K-1, the right end sliding plate 1E is fixedly connected with the tail end of the right clamping plate 1B through a screw, the lower end of the right end sliding plate 1E is also provided with a sliding hole, the rear sliding plate 1R and the rear sliding plate 1G are respectively fixedly connected with the rear clamping plate 1C through a screw, the lower end of the rear sliding plate 1R is provided with a sliding hole, the lower end of the rear sliding plate 1G is provided with a sliding hole, a plurality of anti-slip pads 1N are connected with the right clamping plate 1B, a plurality of anti-slip pads 1M are connected with the rear clamping plate 1C, a plurality of anti-slip pads 1L are connected with the rear clamping plate 1C, and a plurality of anti-slip pads 1F are also connected with the left clamping plate 1H.

The second clamping piece assembly 17 is the same as the first clamping piece assembly 1 in structure, refer to fig. 1 and 27, the second clamping piece assembly 17 comprises a handle 17-1, a rear clamping plate 17-2, a left clamping plate 17-3, a right clamping plate 17-4, a left end sliding plate 17-5, a right end sliding plate 17-6, a rear sliding plate I and a rear sliding plate II, the lower end of the right end sliding plate 17-6 is provided with a sliding hole 17-6-1, the handle 17-1 is fixedly connected with the rear clamping plate 17-2 through a screw, the left clamping plate 17-3 is fixedly connected with the rear clamping plate 17-2 through a left corner connecting piece, the right clamping plate 17-4 is fixedly connected with the right end of the rear clamping plate 17-2 through a right corner connecting piece, the left end sliding plate 17-5 is fixedly connected with the tail end of the left clamping plate 17-3 through a screw, the lower end of the left end sliding plate 17-5 is provided with a sliding hole, the right end sliding plate 17-6 is fixedly connected with the tail end of the right clamping plate 17-4 through a screw, the lower end of the right end sliding plate 17-6 is also provided with a sliding hole, the rear sliding plate I and the rear clamping plate 17-2 is fixedly connected with a plurality of upper and lower clamping plates 17-2 through a plurality of sliding pads, the upper and lower clamping plates 17-17 are respectively connected with the upper clamping plates and the lower clamping plates are fixedly connected with the upper clamping plates and lower clamping plates.

The locking device comprises four unidirectional spring clamp assemblies 6 and two bidirectional spring clamp assemblies.

As shown in fig. 6-8, the one-way spring clamp assembly 6 includes a spring 6A, a split washer 6B, a guide shaft 6C, a base 6D, the base 6D having a receiving groove 6D-3, a rear shaft hole 6D-1 provided at a rear end of the base 6D, a front shaft hole 6D-2 provided at a front end of the base 6D, a blocking portion 6C-1 provided at a rear end of the guide shaft 6C, and a washer connecting groove 6C-2 provided at a front end of the guide shaft 6C. The guide shaft 6C penetrates from the rear shaft hole 6D-1 and then penetrates from the front shaft hole 6D-2, the spring 6A is sleeved on the guide shaft 6C, the split ring 6B is clamped on the ring connecting groove 6C-2 so as to connect the split ring 6B with the front end of the guide shaft 6C, the split ring 6B is positioned outside the base 6D, the blocking part 6C-1 is positioned outside the base 6D, the guide shaft 6C and the spring 6A are positioned in the accommodating groove of the base 6D, and the rear end of the spring 6A abuts against the rear wall of the accommodating groove. The base 6D is fixedly mounted on the flat plate 10 by screws.

As shown in fig. 9-11, the first bidirectional spring clamp assembly 16 comprises a base 16-1, a left spring 16-2, a right spring 16-3, a guide shaft 16-4 and a split retainer 16-5, wherein a retainer connecting groove 16-4-1 is formed in the right end of the guide shaft 16-4, a blocking part 16-4-2 is formed in the left end of the guide shaft 16-4, a placing groove 16-1-1 is formed in the base 16-1, a left shaft hole 16-1-2 is formed in the left end of the base 16-1, a right shaft hole 16-1-3 is formed in the right end of the base 16-1, the guide shaft 16-4 penetrates from the left shaft hole 16-1-2 of the base 16-1 and then penetrates from the right shaft hole 16-1-3, the split retainer 16-5 is clamped in the retainer connecting groove 16-4-1 of the guide shaft 16-4, the guide shaft 16-4 is located in the placing groove 16-1-1 of the base 16-1, the blocking part 16-4-2 is located on the outer side of the base 16-1, and the split retainer 16-5 is located on the outer side of the base 16-1. The left spring 16-2 is sleeved on the guide shaft 16-4, and the right spring 16-3 is sleeved on the guide shaft 16-4. The base 16-1 is fixedly connected with the flat plate 10 by screws.

As shown in fig. 12-16, when the right end sliding plate 17-6 of the second clip assembly 17 is assembled with the first bi-directional spring clip assembly 16, the guide shaft 16-4 is inserted through the left shaft hole 16-1-2 of the base 16-1, the left spring 16-2 is then fitted over the guide shaft 16-4, and then the guide shaft 16-4 is passed through the sliding hole of the right end sliding plate 17-6 (i.e., the right end sliding plate 17-6 is fitted over the guide shaft 16-4). After the right end sliding plate 17-6 in the second clamping piece assembly 17 is assembled, the left end sliding plate 1K of the first clamping piece assembly 1 is installed, the assembly method is that the left end sliding plate 1K is sleeved on the guide shaft 16-4 (namely, the guide shaft 16-4 passes through the sliding hole 1K-1 of the left end sliding plate 1K), the right spring 16-3 is sleeved on the guide shaft 16-4, then the right end of the guide shaft 16-4 passes through the right shaft hole 16-1-3 of the base 16-1, and finally, the split ring 16-5 is connected with the ring connecting groove 16-4-1 at the right end of the guide shaft 16-4. This positions the right spring 16-3 between the left end slide plate 1K and the rear wall of the placement groove 16-1, the left spring 16-2 between the front wall of the placement groove 16-1-1 and the right end slide plate 17-6, and the left spring 16-2 is compressed by the right end slide plate 17-6 moving leftward, and the right spring 16-3 is compressed by the left end slide plate 1K moving rightward.

Referring to fig. 1, there are a total of two bi-directional spring clamp assemblies fixedly mounted on the plate 10, the first bi-directional spring clamp assembly 16, the second bi-directional spring clamp assembly 18 being disposed opposite each other; the structure of the second bidirectional spring clamp assembly 18 is the same as that of the first bidirectional spring clamp assembly 16, the second bidirectional spring clamp assembly 18 comprises a base, a left spring, a right spring, a guide shaft and an opening retainer ring, the right end of the guide shaft is provided with a retainer ring connecting groove, the left end of the guide shaft is provided with a blocking part, the base is provided with a placing groove, the left end of the base is provided with a left shaft hole, the right end of the base is provided with a right shaft hole, the guide shaft penetrates from the left shaft hole of the base and then penetrates from the right shaft hole, the opening retainer ring is clamped in the retainer ring connecting groove of the guide shaft, the guide shaft is positioned in the placing groove of the base, the blocking part is positioned at the outer side of the base, and the opening retainer ring is positioned at the outer side of the base; the left spring is sleeved on the guide shaft, and the right spring is sleeved on the guide shaft. Similarly, the connection between the left end sliding plate 17-5 of the second clip assembly 17 and the second bi-directional spring clamp assembly 18 is the same as the connection between the right end sliding plate 17-6 of the second clip assembly 17 and the first bi-directional spring clamp assembly 16. The connection between the right end slide plate 1E of the first clip assembly 1 and the second bi-directional spring clip assembly 18 is the same as the connection between the left end slide plate 1K of the first bi-directional spring clip assembly 16 and the first bi-directional spring clip assembly 16. The guide shaft of the second bidirectional spring clamp assembly 18 is penetrated from the left shaft hole of the base, the left spring is sleeved on the guide shaft, the guide shaft passes through the sliding hole of the left end sliding plate 17-5, the guide shaft passes through the sliding hole of the right end sliding plate 1E, the right spring is sleeved on the guide shaft, the right end of the guide shaft passes through the right shaft hole of the base, and finally the right end of the guide shaft is connected with the check ring connecting groove of the right end of the guide shaft by the split ring.

As shown in fig. 17, when the first clip assembly 1 and the one-way spring clip assembly 6 are assembled together, the guide shaft 6C of the one-way spring clip assembly 6 is inserted from the rear shaft hole 6D-1, the spring 6A is then sleeved on the guide shaft 6C from the front end of the guide shaft 6C, the front end of the guide shaft 6C is then passed through the sliding hole of the rear slide plate 1R (i.e., the rear slide plate 1R is sleeved on the guide shaft 6C), the front end of the guide shaft 6C is finally passed through the front shaft hole 6D-2, the circlip 6B is connected with the circlip connecting groove 6C-2, so that the spring 6A is positioned between the rear slide plate 1R and the rear wall of the accommodating groove 6D-3, the front end of the spring 6A abuts against the rear slide plate 1R, and the rear end of the spring 6A abuts against the rear wall of the accommodating groove 6D-3, and the spring 6A is compressed when the rear slide plate 1R moves rightward (moves toward the rear end of the base 6D).

Referring to fig. 1 and 2, four unidirectional spring clip assemblies 6 are mounted on the flat plate 10, two on one side are used for being connected and matched with the first rear sliding plate 1R and the second rear sliding plate 1G of the first clip assembly 1, and two on the other side are used for being connected and matched with the first rear sliding plate and the second rear sliding plate of the second clip assembly 17. The connection mode of the rear sliding plate II 1G and the corresponding one-way spring clamp assembly is the same as that of the rear sliding plate I1R and the corresponding one-way spring clamp assembly. The connection mode of the rear sliding plate I of the second clamping piece assembly 17 and the corresponding one-way spring clamp assembly is the same as the connection mode of the rear sliding plate I1R and the corresponding one-way spring clamp assembly, and the connection mode of the rear sliding plate II of the second clamping piece assembly 17 and the corresponding one-way spring clamp assembly is the same as the connection mode of the rear sliding plate I1R and the corresponding one-way spring clamp assembly. When the handle 1A of the first clip assembly 1 is pulled outward (pulled rightward in fig. 2), the springs in the one-way spring clamp assemblies that mate with the rear slide plate one 1R and the rear slide plate two 1G are compressed. When the handle 1A of the second clip assembly 17 is pulled outward (to the right and left in fig. 2), the springs in the one-way spring clamp assemblies that mate with the first and second rear slide plates are compressed.

As shown in fig. 18, 19, 20 and 21, the telescopic mechanism comprises a first telescopic fixed plate 2, a second telescopic fixed plate 3, a butterfly nut 14 and a first knurled hand screw 15, wherein the upper end of the first telescopic fixed plate 2 is provided with a through hole 2-1, the lower end of the first telescopic fixed plate 2 is provided with a lower threaded hole 1-2 and a lower threaded hole 2-3, the first telescopic fixed plate 2 is provided with a sliding table 2-4 and a limiting step 2-5, the second telescopic fixed plate 3 is provided with a sliding groove 3-1 and a limiting step 3-2, the sliding groove 3-1 is provided with a screw position adjusting hole 3-4, and the upper end of the second telescopic fixed plate 3 is provided with a threaded hole 3-3. The sliding table 2-4 is embedded into the sliding groove 3-1, the first knurled manual screw 15 passes through the through hole 2-1 and then passes through the screw position adjusting hole 3-4, and the butterfly nut 1 is connected with the first knurled manual screw 15. The flat plate 10 is connected with the threaded hole 3-3 at the upper end of the second telescopic fixed plate 3 through a screw, so that the second telescopic fixed plate 3 is fixed on the flat plate.

As shown in fig. 22, the space positioner clamp 4 includes a ring portion 4-1 with an opening, a connecting rod portion 4-2, a first limiting member 4-5, a second limiting member 4-6, and a third limiting member 4-7, the ring portion 4-1 with the opening and the connecting rod portion 4-2 are in an integral structure, the connecting rod portion 4-2 is provided with a waist-shaped hole 4-3 and a waist-shaped hole 4-4, the first limiting member 4-5 and the second limiting member 4-6 are connected with an opening of the ring portion 4-1 with the opening, the third limiting member 4-7 is connected with the ring portion 4-1 with the opening, and the position distribution of the first limiting member 4-5, the second limiting member 4-6 and the third limiting member 4-7 is in a triangular distribution state. The circular ring part 4-1 with the opening is provided with the opening so that the circular ring part has certain elasticity, on one hand, the circular ring part is convenient to put into the space positioner, and on the other hand, the circular ring part can be suitable for space positioners with different sizes.

As shown in fig. 23, the second knurled hand screw 19 passes through the waist-shaped hole 4-3 of the space locator clamp 4 and is connected with the lower threaded hole 2-2 of the first telescopic fixing plate 2, and the third knurled hand screw 20 passes through the waist-shaped hole 4-4 of the space locator clamp 4 and is connected with the lower threaded hole 2-3 of the first telescopic fixing plate 2, thereby fixing the space locator clamp 4. The first telescopic fixing plate 2 is in the vertical direction, and due to the design of the two waist-shaped holes, the position of the space locator clamp 4 can be adjusted along the horizontal direction, and the second knurled hand screw 19 and the third knurled hand screw 20 can be screwed. The position of the first telescopic fixed plate 2 is vertically adjusted, the first knurled hand-screwed screw 15 moves in the screw position adjusting hole 3-4, and after the position of the first telescopic fixed plate 2 is adjusted, the first knurled hand-screwed screw is locked and fixed by the butterfly nut 14, and then the position of the space locator clamp 4 is adjusted in the vertical direction.

The correction plate positioning means comprise two first support plates 8 and two first clamping plates 7.

As shown in fig. 24-26, the first support plate 8 is provided with a fixing portion 8-1, a clamping plate connecting portion 8-2, and a correction plate positioning groove 8-3, the fixing portion 8-1 is provided with three screw holes 8-1-1, and the clamping plate connecting portion 8-2 is provided with screw holes 8-2-1. Referring to fig. 1 to 3, the fixing portion 8-1 is attached to the bottom surface of the flat plate 10, and three screws are respectively passed through the three screw holes 8-1-1 to be connected with screw holes of the bottom surface of the flat plate 10, thereby achieving the fixation of the first support plate 8 to the bottom surface of the flat plate 10. As shown in FIG. 32, 12-inch correction plate 9 is provided with two oppositely disposed notches 9-1. The flat plate 10 is provided with a round hole 10-1 for accommodating the correction plate, when the edge of the 12-inch correction plate 9 is placed in the correction plate positioning groove 8-3, the clamping plate connecting part 8-2 is embedded into the notch 9-1 of the 12-inch correction plate 9, two first support plates 8 are arranged oppositely, the clamping plate connecting parts 8-2 of the two first support plates 8 are respectively embedded into the two notches 9-1 of the 12-inch correction plate 9, and the two first support plates 8 realize positioning on the 12-inch correction plate 9. As shown in FIGS. 27 and 28, the first clamping plate 7 is provided with screw holes 7-1, and the first clamping plate 7 is placed on the 12-inch correction plate 9, and is connected with screw holes 8-2-1 of the clamping plate connecting portion 8-2 after passing through the screw holes 7-1 by screws, so that the first clamping plate 7 tightly fixes the 12-inch correction plate 9 from the top surface of the 12-inch correction plate 9. There are two first clamping plates 7 in total, one first support plate 8 matching one first clamping plate 7.

When the calibration plate fixing device is used, the space positioner 5 is placed on the space positioner clamp 4 (referring to fig. 1 and 23, the edge of the circular top of the space positioner 5 is clamped on the circular ring part 4-1 with the opening of the space positioner clamp 4, the circular ring part 4-1 with the opening supports the edge of the circular top of the space positioner 5, the first limiting component 4-5, the second limiting component 4-6 and the third limiting component 4-7 limit the circular top of the space positioner 5 from above), and then the 12-inch calibration plate is fixed on the two first support plates 8 and clamped by the two first clamping plates 7, so that the calibration plate is prevented from displacement or falling.

The first clamping piece assembly body 1 and the second clamping piece assembly body 17 are pulled outwards by holding the handles, the first clamping piece assembly body 1 and the second clamping piece assembly body 17 are sleeved on the movable C-shaped arm X-ray machine, the hands are slowly loosened, the clamping force of springs in the bidirectional spring clamp assembly body and the unidirectional spring clamp assembly body is utilized, and meanwhile, the calibration plate fixing device is fixed on the shell of the X-ray emission source 21 of the movable C-shaped arm X-ray machine by utilizing the friction force of the anti-slip pad, as shown in fig. 33, the calibration plate fixing device is finely adjusted, so that the optimal shooting angle is achieved. A plurality of optical pellets (made of stainless steel) are arranged in small holes on the 12-inch correction plate, and when the C-arm X-ray machine emits rays, other parts can pass through the small holes, but the stainless steel pellets are too long, so that small black dots are displayed on an imaged picture, and the effect is to locate the position (such as the spine) of bones needing to be photographed.

The distance between the space positioner 5 and the X-ray emission source 21 can be adjusted along the vertical direction by utilizing the telescopic mechanism in the shooting process so as to achieve different shooting effects, thereby helping doctors to make judgment, assisting the doctors to finish the operation and improving the efficiency and success rate of the operation. The position of the spatial locator 5 is adjusted in the vertical direction by means of a telescopic mechanism to fit the correction plate. For the spatial locator 5, the invention application publication number CN112190333a discloses a spatial locator.

The correction plate generally has two types of 9 inches and 12 inches, when the correction plate needs to be replaced by 9 inches, the second support plate 22 can be fixed on the first support plate 8 through screws, and then the correction plate with 9 inches is placed on the second support plate 22, and the specific operation is that: 34-37, the second support plate 22 is provided with a splicing groove 22-1, a slot 22-2, a correction plate positioning groove 22-3 and a clamping plate connecting part 22-4, and the splicing groove 22-1 is provided with three screw holes 22-1-1; as shown in fig. 38 and 39, the second clamping plate 23 is provided with screw holes 23-1; 41-43, the second support plate 22 is abutted with the first support plate 8, the clamping plate connecting portion 8-2 of the first support plate 8 is inserted into the inserting groove 22-2 of the second support plate 22, the correction plate positioning groove 8-3 of the first support plate 8 is spliced with the splicing groove 22-1 of the second support plate 22, and three screws are used to pass through the three screw holes 22-1-1 on the splicing groove 22-1 and then connected with the second support plate connecting screw holes 8-4 on the first support plate 8 so as to fix the second support plate 22; each first support plate 8 is fitted with a second support plate 22. Referring to FIG. 44, the edge of 9-inch correction plate 11 is placed in correction plate positioning groove 22-3 of second support plate 22, clamping plate connecting portion 22-4 is embedded in notch 11-1 of 9-inch correction plate 11, two second support plates 22 are in total, two second support plates 22 are arranged oppositely, clamping plate connecting portions 22-4 of two second support plates 22 are respectively embedded in two notches 11-1 of 9-inch correction plate 11, and two second support plates 22 realize positioning of 9-inch correction plate 11. The second clamping plate 23 is placed on the 9-inch correction plate 11 and is connected with the screw hole on the clamping plate connecting part 22-4 after passing through the screw hole 23-1 by using a screw, so that the second clamping plate 23 compresses and fixes the 9-inch correction plate 11 from the top surface of the 9-inch correction plate 11, and the correction plate is prevented from displacement or falling off. There are a total of two second clamping plates 23, one second support plate matching one second clamping plate 23.

The method of photographing using the 9-inch correction plate is the same as the method of photographing using the 12-inch correction plate.

It should be noted that other known telescopic structures may be used as the telescopic mechanism.

The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one skilled in the art is informed by this disclosure, other configurations of parts, driving devices and connection modes are adopted without creatively designing similar structures and embodiments without departing from the spirit of the present invention, and the present invention shall not be limited by the scope of the present invention.

Claims (7)

1. The device is characterized by comprising a flat plate, a telescopic mechanism, a space locator clamp, a correction plate positioning device, a locking device, a first clamping piece assembly body and a second clamping piece assembly body, wherein the telescopic mechanism is fixedly connected with the bottom surface of the flat plate, the space locator clamp is fixedly connected with the lower end of the telescopic mechanism, the locking device is connected with the flat plate, and the first clamping piece assembly body and the second clamping piece assembly body are connected and matched with the locking device; the correction plate positioning device is connected with the flat plate;

The first clamping piece assembly comprises a handle, a left clamping plate, a right clamping plate, a rear clamping plate, a right corner connecting piece, a left corner connecting piece, a rear sliding plate I, a rear sliding plate II, a left end sliding plate and a right end sliding plate, wherein the handle is fixedly connected with the rear clamping plate, the left corner connecting piece is fixedly connected with the left end of the rear clamping plate, the left clamping plate is fixedly connected with the left corner connecting piece, the right corner connecting piece is fixedly connected with the right end of the rear clamping plate, the right clamping plate is fixedly connected with the right corner connecting piece, the left end sliding plate is fixedly connected with the tail end of the left clamping plate, the lower end of the left end sliding plate is provided with a sliding hole, the right end sliding plate II is also provided with a sliding hole, the rear sliding plate I and the rear sliding plate II are respectively fixedly connected with the rear clamping plate, the lower end of the rear sliding plate I is provided with a sliding hole, and the lower end of the rear sliding plate II is provided with a sliding hole;

The second clamping piece assembly comprises a handle, a rear clamping plate, a left clamping plate, a right clamping plate, a left end sliding plate, a right end sliding plate, a rear sliding plate I and a rear sliding plate II, wherein the handle is fixedly connected with the rear clamping plate, the left clamping plate is fixedly connected with the rear clamping plate through a left corner connecting piece, the right clamping plate is fixedly connected with the right end of the rear clamping plate through a right corner connecting piece, the left end sliding plate is fixedly connected with the tail end of the left clamping plate, the lower end of the left end sliding plate is provided with a sliding hole, the right end sliding plate is fixedly connected with the tail end of the right clamping plate, the lower end of the right end sliding plate is provided with a sliding hole, the rear sliding plate I and the rear sliding plate II are respectively fixedly connected with the rear clamping plate, the lower end of the rear sliding plate I is provided with a sliding hole, and the lower end of the rear sliding plate II is provided with a sliding hole;

The locking device comprises four unidirectional spring clamp assemblies and two bidirectional spring clamp assemblies; the unidirectional spring clamp assembly comprises a spring, an opening retainer ring, a guide shaft and a base, wherein the base is provided with an accommodating groove, the rear end of the base is provided with a rear shaft hole, the front end of the base is provided with a front shaft hole, the rear end of the guide shaft is provided with a blocking part, the front end of the guide shaft is provided with a retainer ring connecting groove, the guide shaft penetrates from the rear shaft hole and then penetrates out of the front shaft hole, the spring is sleeved on the guide shaft, the opening retainer ring is connected with the retainer ring connecting groove of the guide shaft, the opening retainer ring is positioned outside the base, the blocking part is positioned outside the base, the guide shaft and the spring are positioned in the accommodating groove of the base, and the rear end of the spring abuts against the rear wall of the accommodating groove; the base is fixedly connected with the flat plate;

The two bidirectional spring clamp assemblies are respectively a first bidirectional spring clamp assembly and a second bidirectional spring clamp assembly; the first bidirectional spring clamp assembly comprises a base, a left spring, a right spring, a guide shaft and an opening check ring, wherein a check ring connecting groove is formed in the right end of the guide shaft of the first bidirectional spring clamp assembly, a blocking part is arranged at the left end of the guide shaft, a placing groove is formed in the base of the first bidirectional spring clamp assembly, a left shaft hole is formed in the left end of the base of the first bidirectional spring clamp assembly, a right shaft hole is formed in the right end of the base of the first bidirectional spring clamp assembly, the guide shaft of the first bidirectional spring clamp assembly penetrates through the left shaft hole of the base and then penetrates out of the right shaft hole, the opening check ring of the first bidirectional spring clamp assembly is connected with the check ring connecting groove of the guide shaft, the guide shaft of the first bidirectional spring clamp assembly is arranged in the placing groove, and the left spring and the right spring are respectively sleeved on the guide shaft in the first bidirectional spring clamp assembly; the base of the first bidirectional spring clamp assembly is fixedly connected with the flat plate; the second bidirectional spring clamp assembly comprises a base, a left spring, a right spring, a guide shaft and an opening retainer ring;

The guide shaft of the first bidirectional spring clamp assembly penetrates through the sliding hole of the right end sliding plate in the second clamping piece assembly, the guide shaft of the first bidirectional spring clamp assembly penetrates through the sliding hole of the left end sliding plate in the first clamping piece assembly, the right spring is positioned between the rear wall of the placing groove and the left end sliding plate of the first clamping piece assembly, and the left spring is positioned between the front wall of the placing groove and the right end sliding plate of the second clamping piece assembly; the left end sliding plate of the second clamping piece assembly is sleeved on the guide shaft of the second bidirectional spring clamp assembly, and the right end sliding plate of the first clamping piece assembly is sleeved on the guide shaft of the second bidirectional spring clamp assembly;

The guide shaft in one-way spring clamp assembly penetrates through the sliding hole of the rear sliding plate I in the first clamping piece assembly, and the front end of the spring in the one-way spring clamp assembly abuts against the rear sliding plate I of the first clamping piece assembly; the second back sliding plate of the first clamping piece assembly is connected and matched with the second unidirectional spring clamp assembly, and the first back sliding plate and the second back sliding plate of the second clamping piece assembly are respectively connected and matched with the other two unidirectional spring clamp assemblies;

the flat plate is provided with a round hole for accommodating the correction plate.

2. The calibration plate fixing device according to claim 1, wherein the calibration plate positioning device comprises two first support plates and two first clamping plates, the first support plates are provided with fixing parts, clamping plate connecting parts and calibration plate positioning grooves, the fixing parts are provided with screw holes, the clamping plate connecting parts are provided with screw holes, the fixing parts are attached to the bottom surface of the flat plate, and the screw holes penetrating through the fixing parts with screws are connected with the bottom surface of the flat plate through screw structures; the two first supporting plates are oppositely arranged, and the first clamping plates are provided with screw holes.

3. The calibration plate fixing arrangement of claim 1 or 2, wherein the left clamping plate, the right clamping plate and/or the rear clamping plate of the first clamping plate assembly are/is connected with a non-slip mat.

4. The alignment plate fixing device according to claim 1 or 2, wherein the right clamping plate, the rear clamping plate and/or the left clamping plate of the second clamping plate assembly are/is connected with a non-slip mat.

5. The calibrating plate fixing apparatus of claim 2 wherein the calibrating plate positioning apparatus further comprises a second supporting plate and a second clamping plate, the second clamping plate is provided with screw holes, the first supporting plate is provided with second supporting plate connecting screw holes, the second supporting plate is provided with a splicing groove, a slot, a calibrating plate positioning groove and a clamping plate connecting part, the splicing groove is provided with screw holes, the clamping plate connecting part of the first supporting plate is inserted into the slot of the second supporting plate, the calibrating plate positioning groove of the first supporting plate is spliced with the splicing groove of the second supporting plate, and the screw holes are connected with the second supporting plate connecting screw holes of the first supporting plate after passing through the screw holes of the splicing groove.

6. The calibration plate fixing device according to claim 1 or 2, wherein the telescopic mechanism comprises a first telescopic fixing plate, a second telescopic fixing plate, a butterfly nut and a first knurled manual screwing screw, a through hole is formed in the upper end of the first telescopic fixing plate, a sliding table and a limiting step are formed in the first telescopic fixing plate, a sliding groove and a limiting step are formed in the second telescopic fixing plate, a screw position adjusting hole is formed in the sliding groove of the second telescopic fixing plate, a threaded hole is formed in the upper end of the second telescopic fixing plate, the sliding table of the first telescopic fixing plate is embedded into the sliding groove of the second telescopic fixing plate, the first knurled manual screwing screw penetrates through the through hole in the upper end of the first telescopic fixing plate and then penetrates through the screw position adjusting hole, and the butterfly nut is connected with the first knurled manual screwing screw; the flat plate is connected with a threaded hole at the upper end of the second telescopic fixed plate through a screw; the lower end of the first telescopic fixed plate is fixedly connected with the space locator clamp.

7. The calibration plate fixing device according to claim 6, wherein the spatial locator clamp comprises a circular ring part with an opening, a connecting rod part, a first limiting part, a second limiting part and a third limiting part, the connecting rod part is provided with a first waist-shaped hole and a second waist-shaped hole, the first limiting part and the second limiting part are connected with an opening of the circular ring part with the opening, the third limiting part is connected with the circular ring part with the opening, and the position distribution of the first limiting part, the second limiting part and the third limiting part is in a triangular distribution state;

The lower end of the first telescopic fixed plate is provided with a first lower threaded hole and a second lower threaded hole, and two knurled hand screws penetrate through the first waist-shaped hole and the second waist-shaped hole of the space locator clamp and are connected with the first lower threaded hole and the second lower threaded hole of the lower end of the first telescopic fixed plate.