Bone traction automatic drill

Abstract

The present application relates to a kind of bone traction automatic drill, including base, positioning ring and automatic hammer device, positioning ring is fixedly arranged on base, positioning ring is used to place the lower leg of patient, and fixed rod is installed on positioning ring and can be opened or closed;At least one bone needle enters the hole on the side of one side of positioning ring, at least one bone needle exits the hole on the side of the other side of positioning ring, and bone needle exits the hole and bone needle enters the hole same number and one-to-one coaxial correspondence;Automatic hammer device is installed on base, and automatic hammer device includes hammer frame, hammer shaft, hammer head, damping cylinder and reciprocating drive mechanism.The present application is ingenious in structure, and reasonable in design, by setting base, positioning ring and automatic hammer device, positioning ring is used to place the lower leg of patient, can make patient lower leg keep stable in bone traction drilling process;Automatic hammer device can hit the tail end of bone needle multiple times quickly, and efficiently and accurately complete the operation of bone needle driving in.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of orthopedic treatment appliances, in particular, a kind of bone traction automatic drill, belong to medical instrument design technical field. BACKGROUND

[0002] At present, the treatment method after the fracture of patient's lower limbs to preoperative is that the affected limb is traction fixed, and the operation of bone traction mainly relies on the personal experience of doctor, and the positioning of bone needle puncture relies on personal feeling, and when making traction, it cannot be truly accurate, and the position of bone needle puncture often deviates from the expected position, and the operation of bone traction of doctor at present is all manual operation (use hammer to repeatedly knock bone needle), it is time-consuming, and the speed is slow, and the pain of patient is severe.

[0003] Therefore, it is necessary to design a kind of bone traction automatic drill to solve the above problems. SUMMARY

[0004] The present application aims at overcoming the deficiencies in the prior art, and provides a kind of bone traction automatic drill, which is ingenious in structure, reasonable in design, can automatically and quickly knock bone needle, and can complete bone needle puncture in a very short time, and can also keep the lower leg of patient stable during the process of bone traction drilling, to ensure the accuracy of drilling.

[0005] According to the technical scheme provided by the present application: the bone traction automatic drill is characterized by comprising a base, a positioning ring and an automatic needle striking device, the positioning ring is fixedly arranged on the base, and the positioning ring is used for placing the lower leg of patient, a fixed rod that can be opened or closed is installed on the positioning ring, and the fixed rod is used for limiting the lower leg, at least one bone needle puncture hole is arranged on the side surface of one side of the positioning ring, at least one bone needle puncture hole is arranged on the side surface of the other side of the positioning ring, the number of the bone needle puncture hole and the bone needle puncture hole is the same and coaxially corresponds one by one, the automatic needle striking device is installed on the base, the automatic needle striking device comprises a needle striking frame, a needle striking shaft, a needle striking head, a damping cylinder and a reciprocating motion driving mechanism, the needle striking frame is fixedly installed on the base, the reciprocating motion driving mechanism is installed on the needle striking frame, the needle striking shaft is fixedly connected with the reciprocating motion part of the reciprocating motion driving mechanism, two 180-degree symmetrical limiting grooves are arranged on the side wall of the needle striking shaft in the axial direction, and a saw-shaped gear rack with tooth tips forward is arranged in the limiting groove; an axial connection hole is arranged in the rear center of the needle striking head, the front part of the needle striking shaft is inserted into the axial connection hole, two 180-degree symmetrical elastic clamping pins are installed on the rear side wall of the needle striking head, and the inner end of the elastic clamping pin is embedded in the saw-shaped gear rack when not subjected to external force; the damping cylinder is sleeved outside the needle striking head, there is friction damping between the damping cylinder and the needle striking head, and the friction force is adjustable, and the damping cylinder is fixedly connected to the reciprocating motion driving mechanism through a support rod.

[0006] As a further improvement of the present application, the reciprocating motion driving mechanism comprises a mounting bracket, a runway type gear ring, a sector gear, a gear shaft and a driving motor reducer, the mounting bracket is fixedly installed on the hammer frame, a sliding groove is arranged in the mounting bracket, the runway type gear ring is slidingly installed in the sliding groove, an upper rack is arranged on the inner side of the upper straight edge of the runway type gear ring, a lower rack is arranged on the inner side of the lower straight edge of the runway type gear ring, the sector gear is installed at the center of the runway type gear ring, the sector gear is alternately engaged with the upper rack and the lower rack when rotating, the gear shaft is fixedly installed at the center of the sector gear, the gear shaft penetrates through the back of the mounting bracket and is connected with the output shaft of the driving motor reducer, and the driving motor reducer is installed on the back of the mounting bracket; the rear end of the hammer head is fixedly connected at the top center of the front arc edge of the runway type gear ring.

[0007] As a further improvement of the present application, the hammer frame comprises a frame seat, a screw rod, a hand wheel, a screw seat, a connecting plate, a longitudinal sliding body, an adjusting bolt and a vertical sliding body, the frame seat is fixedly installed on the base, the longitudinal sliding body is slidingly installed on the upper surface of the frame seat through a dovetail sliding groove structure, the connecting plate is installed on the rear side of the longitudinal sliding body, and the screw rod head is rotatably connected to the connecting plate; the screw seat is installed on the upper surface of the frame seat, the screw rod is threadedly installed in the screw seat, and the hand wheel is installed at the tail end of the screw rod; the vertical sliding body is slidingly installed on the front surface of the longitudinal sliding body through a dovetail sliding groove structure, the upper end of the longitudinal sliding body is provided with an adjusting mounting table, and the adjusting bolt is installed on the adjusting mounting table; the back surface of the vertical sliding body is provided with a connecting table, the connecting table penetrates through the rear surface of the longitudinal sliding body and is exposed, the lower end of the adjusting bolt is threadedly connected to the connecting table, and the reciprocating motion driving mechanism is fixedly installed on the vertical sliding body.

[0008] As a further improvement of the present application, the elastic pin comprises a pin sleeve, a spring and a pin column, the outer wall of the pin sleeve is provided with external threads, the pin sleeve is threadedly installed in the hammer head, the spring and the pin column are arranged in the pin sleeve, the front end of the pin column is provided with a pin head, the front end of the pin sleeve is provided with a through hole, the pin head of the pin column penetrates out of the through hole and is exposed, a step is arranged on the pin column to prevent the pin column from being pulled out, the spring is sleeved on the rear part of the pin column, one end of the spring is abutted against the inner side of the tail end of the pin sleeve, the other end of the spring is connected with the pin column, and the spring drives the pin head to penetrate out of the through hole when no external force is applied; a metal block that can be attracted by a magnet is installed at the tail end of the pin column, or the pin column is made of a metal material that can be attracted by a magnet.

[0009] As a further improvement of the present application, the damping cylinder comprises an outer cylinder body and a damping friction block, at least one axial slot is formed in the inner wall of the outer cylinder body and penetrates through from one end to the other end of the damping cylinder, the damping friction block that is in shape conformity is installed in the axial slot, a nut is embedded in the back surface of the damping friction block, an adjusting screw that can be rotated freely is installed on the outer cylinder body, and the inner end of the adjusting screw is threadedly connected in the nut.

[0010] As a further improvement of the present application, a guide sleeve corresponding to the bone needle penetrating hole is arranged on the side surface of the positioning ring, and a guide hole is arranged in the center of the guide sleeve for guiding the bone needle to pass through.

[0011] As a further improvement of the present application, the guide sleeve is threadedly connected to the positioning ring and can be detachably removed.

[0012] As a further improvement of the present application, one end of the fixing rod is hingedly connected to one side of the positioning ring, and a connecting head is arranged at the other end of the fixing rod, the inner side surface of the connecting head is provided with a plurality of ratchet teeth, the outer surface of the other side of the positioning ring is provided with a clamping platform for locking the ratchet teeth, and the outer side surface of the connecting head is provided with a pulling ring for unlocking the connecting head.

[0013] As a further improvement of the present application, the inner side surface of the fixing rod is provided with an elastic pad.

[0014] As a further improvement of the present application, a fixing bolt is arranged at the four corners of the bottom of the base.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] 1) The present application has a clever structure and reasonable design, the positioning ring is used for placing the lower leg of the patient, and the automatic hammering device can quickly hammer the tail end of the bone needle multiple times, so that the bone needle is efficiently and accurately hammered.

[0017] 2) The hammering frame in the automatic hammering device can be adjusted in multiple directions, and the position of the hammering head in the automatic hammering device can be quickly adjusted to meet the operation requirements.

[0018] 3) The present application is provided with a guide sleeve to guide the entry of the bone needle, so as to improve the accuracy of drilling, and the guide sleeve can be detachably removed, so that different inner diameters of the guide sleeve can be replaced according to the selected size of the bone needle, so as to ensure the accurate and reliable guidance of the bone needle. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structure front view of the embodiment of the present application.

[0020] Figure 2 It is a structure top view of the embodiment of the present application.

[0021] Figure 3The figure is a perspective view of the hammer frame in the embodiment of the present application.

[0022] Figure 4 The figure is a sectional view of the structure of the automatic hammer device without the hammer frame in the embodiment of the present application. Figure 2 The figure is a sectional view of the structure of the automatic hammer device without the hammer frame in the embodiment of the present application.

[0023] Figure 5 The figure is a sectional view of the structure of the automatic hammer device without the hammer frame in the embodiment of the present application. Figure 4 The figure is a sectional view of the structure of the automatic hammer device without the hammer frame in the embodiment of the present application.

[0024] Figure 6 The figure is a sectional view of the structure of the automatic hammer device without the hammer frame in the embodiment of the present application.

[0025] Figure 7 The figure is a sectional view of the structure of the automatic hammer device without the hammer frame in the embodiment of the present application. Figure 1 The figure is a sectional view of the structure of the automatic hammer device without the hammer frame in the embodiment of the present application.

[0026] BRIEF DESCRIPTION OF DRAWINGS 1-base, 2-positioning ring, 2a-bone needle insertion hole, 2b-bone needle exit hole, 2c-clamping table, 3-fixed rod, 3a-connection head, 3b-ratchet, 3c-pull ring, 4-hammer frame, 4.1-frame seat, 4.2-screw rod, 4.3-hand wheel, 4.4-screw seat, 4.5-connection plate, 4.6-longitudinal sliding body, 4.6a-adjustment installation table, 4.7-adjustment screw, 4.8-vertical sliding body, 4.8a-connection table, 5-hammer shaft, 6-hammer head, 7-damping cylinder, 7.1-outer cylinder body, 7.2-damping friction block, 7.3-nut, 7.4-adjustment screw, 8-saw-shaped rack, 9-elastic clamping pin, 9.1-pin sleeve, 9.2-spring, 9.3-pin column, 9.4-metal block, 10-supporting rod, 11-installation support, 12-runway type gear ring, 12a-upper rack, 12b-lower rack, 13-fan-shaped gear, 14-gear shaft, 15-driving motor speed reducer, 16-guide sleeve, 16a-guiding through hole, 17-elastic pad body, 18-fixing screw, 19-bone needle. DETAILED DESCRIPTION

[0027] The present application will be further described in conjunction with specific drawings and embodiments.

[0028] As Figures 1-7As shown, the embodiment discloses a bone traction automatic drill, including base 1, positioning ring 2 and automatic hammer device, the positioning ring 2 is fixedly arranged on base 1, the positioning ring 2 is used to place the lower leg of patient, the positioning ring 2 is installed with openable or closable fixed rod 3, the fixed rod 3 is used to limit lower leg;The side surface of the one side of positioning ring 2 is equipped with two bone needle penetration holes 2a, the side surface of the other side of positioning ring 2 is equipped with two bone needle exit holes 2b, two bone needle exit holes 2b and two bone needle penetration holes 2a are coaxial correspondence;The automatic hammer device is installed on base 1, and the automatic hammer device includes hammer frame 4, hammer shaft 5, hammer head 6, damping cylinder 7 and reciprocating drive mechanism, the hammer frame 4 is fixedly installed on base 1, the reciprocating drive mechanism is installed on hammer frame 4, the hammer shaft 5 is fixedly connected reciprocating motion piece of reciprocating drive mechanism, two 180 degree symmetrical limit grooves are formed on the side wall of hammer shaft 5 along the axial direction, and saw-shaped rack 8 with tooth tip forward is arranged in the limit groove;The rear center of hammer head 6 is provided with axial connecting hole, the front part of hammer shaft 5 is inserted into the axial connecting hole, two 180 degree symmetrical elastic catches 9 are installed on the rear side wall of hammer head 6, when not under external force, the inner end of the elastic catch 9 is embedded in saw-shaped rack 8;The damping cylinder 7 is sleeved on the outside of hammer head 6, and there is friction damping between damping cylinder 7 and hammer head 6, and the friction force can be adjusted, and damping cylinder 7 is fixedly connected on reciprocating drive mechanism through support rod 10.

[0029] In clinical use, the base 1 is placed on the operating table, the fixed rod 3 is opened first, the lower leg of the patient needing to be drilled for bone traction is placed in the positioning ring 2, the lower leg is adjusted to the appropriate position, then the fixed rod 3 is closed to constrain and position the lower leg of the patient; then the bone needle 19 is inserted into the bone needle insertion hole 2a, the position of the automatic hammer device is adjusted, the front end of the hammer head 6 is aligned with the tail end of the bone needle 19, the automatic hammer device is turned on, the reciprocating part in the reciprocating drive mechanism starts reciprocating, thereby driving the hammer shaft 5 to move forward and backward. When the hammer shaft 5 moves forward, the inner end of the elastic latch 9 is embedded in a tooth of the saw-shaped rack 8

at first, it is embedded in a tooth close to the end of the saw-shaped rack 8

[0030] As Figures 1-4As shown, in the embodiment, the reciprocating motion driving mechanism comprises a mounting bracket 11, a runway type gear ring 12, a sector gear 13, a gear shaft 14 and a driving motor reducer 15, the mounting bracket 11 is fixedly installed on the hammer frame 4, a sliding groove is arranged in the mounting bracket 11, the runway type gear ring 12 is slidingly installed in the sliding groove, an upper rack 12a is arranged on the inner side of the upper straight edge of the runway type gear ring 12, a lower rack 12b is arranged on the inner side of the lower straight edge of the runway type gear ring 12, the sector gear 13 is installed at the center position in the runway type gear ring 12, the sector gear 13 is alternately engaged with the upper rack 12a and the lower rack 12b when rotating, the gear shaft 14 is fixedly installed at the center of the sector gear 13, the gear shaft 14 penetrates to the back of the mounting bracket 11 and is connected with the output shaft of the driving motor reducer 15, the driving motor reducer 15 is installed on the back of the mounting bracket 11, and the rear end of the hammer head 6 is fixedly connected at the top center of the front arc edge of the runway type gear ring 12. In this way, during work, the driving motor reducer 15 drives the gear shaft 14 to rotate, so that the sector gear 13 is alternately engaged with the upper rack 12a and the lower rack 12b, thereby enabling the runway type gear ring 12 to reciprocate forward and backward in the mounting bracket 11. In actual production, the driving motor reducer 15 can also be replaced by other products capable of driving the gear shaft 14 to rotate, such as a rotary air cylinder, a manual crank and the like.

[0031] As Figure 3As shown, in the embodiment, the hammer frame 4 comprises a frame base 4.1, a screw rod 4.2, a hand wheel 4.3, a screw base 4.4, a connecting plate 4.5, a longitudinal sliding body 4.6, an adjusting screw 4.7 and a vertical sliding body 4.8, the frame base 4.1 is fixedly installed on the base 1, the longitudinal sliding body 4.6 is slidingly installed on the upper surface of the frame base 4.1 through a dovetail sliding groove structure, the connecting plate 4.5 is installed on the rear side surface of the longitudinal sliding body 4.6, and the screw rod 4.2 is rotatably connected to the connecting plate 4.5 at the head end; the screw base 4.4 is installed on the upper surface of the frame base 4.1, the screw rod 4.2 is threadedly installed in the screw base 4.4, and the hand wheel 4.3 is installed at the tail end of the screw rod 4.2; the vertical sliding body 4.8 is slidingly installed on the front surface of the longitudinal sliding body 4.6 through a dovetail sliding groove structure, the upper end of the longitudinal sliding body 4.6 is provided with an adjusting mounting table 4.6a, the adjusting screw 4.7 is installed on the adjusting mounting table 4.6a, the back surface of the vertical sliding body 4.8 is provided with a connecting table 4.8a, the connecting table 4.8a penetrates through the rear surface of the longitudinal sliding body 4.6 and is exposed outside, the lower end of the adjusting screw 4.7 is threadedly connected to the connecting table 4.8a, and the reciprocating motion driving mechanism is fixedly installed on the vertical sliding body 4.8. In this way, since the lower legs of different patients are thick or thin, the appropriate bone needle penetration hole 2a needs to be selected according to the individual conditions of the patient during clinical operation to ensure that the bone traction drilling position is appropriate. After the bone needle penetration hole 2a is selected, the position of the hammer head 6 in the automatic hammer device also needs to be adjusted, and the position of the hammer head 6 can be flexibly adjusted by setting the hammer frame 4 in the above structure, the hammer head 6 can be moved forward and backward by rotating the hand wheel 4.3, and the hammer head 6 can be moved up and down by rotating the adjusting screw 4.7.

[0032] As Figure 6As shown, in the embodiment, the elastic pin 9 comprises a pin sleeve 9.1, a spring 9.2 and a pin column 9.3. The outer wall of the pin sleeve 9.1 is provided with external threads, and the pin sleeve 9.1 is screwed into the firing pin head 6. The spring 9.2 and the pin column 9.3 are arranged in the pin sleeve 9.1. The front end of the pin column 9.3 is provided with a pin head. The front end of the pin sleeve 9.1 is provided with a through hole. The pin head of the pin column 9.3 is exposed from the through hole. A step is arranged on the pin column 9.3 to prevent the pin column 9.3 from being pulled out. The spring 9.2 is sleeved on the rear part of the pin column 9.3. One end of the spring 9.2 abuts against the inner side of the tail end of the pin sleeve 9.1, and the other end of the spring 9.2 is connected with the pin column 9.3. The spring 9.2 drives the pin head to be exposed from the through hole when no external force is applied. A metal block 9.4 that can be attracted by a magnet is arranged on the tail end of the pin column 9.3. In this way, when the firing pin head 6 is installed, a special tool can be used to pre-shrink the pin column 9.3 in the elastic pin 9, so as to facilitate the installation of the firing pin head 6 on the firing pin shaft 5. The special tool is fork-shaped, and the inner sides of the two fork arms are provided with magnets. When in use, the magnets on the special tool are respectively aligned with the outer ends of the two elastic pins 9. In this way, the pin column 9.3 can be moved backward by overcoming the elastic force of the spring 9.2 through the magnetic attraction force. The firing pin head 6 can be smoothly installed on the firing pin shaft 5. After being installed in place, the special tool can be removed. In actual processing and manufacturing, the pin column 9.3 can also be made of a metal material that can be attracted by a magnet.

[0033] As shown in Figure 4 , Figure 5 , in the embodiment, the damping cylinder 7 comprises an outer cylinder body 7.1 and a damping friction block 7.2. An axial slot is formed in the inner wall of the outer cylinder body 7.1 and extends from one end to the other end of the damping cylinder 7. The damping friction block 7.2 that is in shape conformity is arranged in the slot. A nut 7.3 is embedded in the back of the damping friction block 7.2. An adjusting screw 7.4 that can rotate freely is arranged on the outer cylinder body 7.1. The inner end of the adjusting screw 7.4 is threadedly connected in the nut 7.3. In this way, the damping friction block 7.2 can be moved inward or outward by rotating the adjusting screw 7.4, so as to change the friction force.

[0034] As shown in Figure 1 , Figure 2 , in the embodiment, the side surface of one side of the positioning ring 2 is further provided with a guide sleeve 16 corresponding to the bone needle penetrating hole 2a. The guide sleeve 16 is threadedly connected on the positioning ring 2 and can be detachably moved. A guide through hole 16a for guiding the bone needle to pass through is arranged in the center of the guide sleeve 16. The guide sleeve 16 is used for guiding the entry of the bone needle 19. In this way, the appropriate guide sleeve 16 can be replaced according to the selected position of the bone needle penetrating hole 2a and the specification of the bone needle 19, so as to ensure the accurate and reliable guidance of the bone needle 19.

[0035] As shown in Figure 7As shown in the drawings, in the embodiment, one end of the fixing rod 3 is hingedly connected to one side of the positioning ring 2, and the other end of the fixing rod 3 is provided with a connecting head 3a, the inner side surface of the connecting head 3a is provided with a plurality of ratchet teeth 3b, the outer surface of the other side of the positioning ring 2 is provided with a clamping table 2c for locking the ratchet teeth 3b, and the outer side surface of the connecting head 3a is provided with a pulling ring 3c for unlocking the connecting head 3a. In this way, the fixing position of the fixing rod 3 can also be adjusted according to the individual conditions of the patient, ensuring proper tightening.

[0036] As shown in the drawings, Figure 1 In the embodiment, the inner side surface of the fixing rod 3 is provided with an elastic pad 17. In this way, the comfort of the patient can be improved, and the rigid contact of the fixing rod 3 can be avoided to prevent the patient from being crushed. The elastic pad 17 can be made of conventional materials in the prior art, such as rubber, silicone, etc.

[0037] As shown in the drawings, Figure 1 , Figure 2 In the embodiment, the bottom of the base 1 is provided with a fixing bolt 18 at the four corner positions. In this way, the base 1 can be installed on the operating table through the fixing bolt 18, avoiding displacement of the entire positioning device during the bone pin 19 driving process, and ensuring safe and reliable bone traction drilling operation.

[0038] The above description is only the preferred embodiment of the present application, and the above specific embodiment is not a limitation of the present application. Various modifications and changes can occur within the technical concept of the present application, and any modification, change or equivalent replacement made by those skilled in the art according to the above description shall fall within the scope of the present application.

Claims

1. A bone traction automatic drill, comprising a base (1), a positioning ring (2) and an automatic hammer device, the positioning ring (2) is fixedly arranged on the base (1), the positioning ring (2) is used for placing the lower leg of a patient, and a fixed rod (3) that can be opened or closed is installed on the positioning ring (2), the fixed rod (3) is used for limiting the lower leg; at least one bone needle penetrating hole (2a) is arranged on the side surface of one side of the positioning ring (2), at least one bone needle exiting hole (2b) is arranged on the side surface of the other side of the positioning ring (2), the number of the bone needle exiting hole (2b) is the same as that of the bone needle penetrating hole (2a) and they coaxially correspond to each other; characterized in that: The automatic hammer device is installed on the base (1), and the automatic hammer device comprises a hammer frame (4), a hammer shaft (5), a hammer head (6), a damping cylinder (7) and a reciprocating driving mechanism, the hammer frame (4) is fixedly installed on the base (1), the reciprocating driving mechanism is installed on the hammer frame (4), the hammer shaft (5) is fixedly connected with a reciprocating part of the reciprocating driving mechanism, two 180-degree symmetrical limiting grooves are formed in the side wall of the hammer shaft (5) in the axial direction, and a saw-shaped gear rack (8) with tooth tips facing forward is arranged in the limiting groove; an axial connecting hole is arranged in the rear center of the hammer head (6), the front part of the hammer shaft (5) is inserted into the axial connecting hole, two 180-degree symmetrical elastic clamping pins (9) are installed on the side wall of the rear part of the hammer head (6), and the inner end of the elastic clamping pin (9) is embedded in the saw-shaped gear rack (8) when no external force is applied; the damping cylinder (7) is arranged outside the hammer head (6), there is friction damping between the damping cylinder (7) and the hammer head (6), the friction force can be adjusted, and the damping cylinder (7) is fixedly connected to the reciprocating driving mechanism through a support rod (10); a guide sleeve (16) corresponding to the bone needle penetrating hole (2a) is further arranged on one side of the positioning ring (2), a guide hole (16a) for guiding the bone needle to pass through is arranged in the center of the guide sleeve (16), and the guide sleeve (16) is used for guiding the entry of the bone needle (19); the inner side of the fixed rod (3) is provided with an elastic pad (17). ​ 2. The automatic bone pin drill of claim 1 wherein: The reciprocating driving mechanism comprises a mounting bracket (11), a runway type gear ring (12), a sector gear (13), a gear shaft (14) and a driving motor speed reducer (15), the mounting bracket (11) is fixedly installed on the hammer frame (4), a sliding groove is arranged in the mounting bracket (11), the runway type gear ring (12) is slidingly installed in the sliding groove, an upper gear rack (12a) is arranged on the inner side of the upper straight edge of the runway type gear ring (12), a lower gear rack (12b) is arranged on the inner side of the lower straight edge of the runway type gear ring (12), the sector gear (13) is installed at the center position in the runway type gear ring (12), the sector gear (13) is alternately engaged with the upper gear rack (12a) and the lower gear rack (12b) when rotating, the gear shaft (14) is fixedly installed at the center of the sector gear (13), the gear shaft (14) penetrates to the back of the mounting bracket (11) and is connected with the output shaft of the driving motor speed reducer (15), and the driving motor speed reducer (15) is installed on the back of the mounting bracket (11); the rear end of the hammer head (6) is fixedly connected to the top center of the front arc edge of the runway type gear ring (12).

3. The bone traction automatic drill according to claim 1, wherein: The hammer frame (4) comprises a frame base (4.1), a screw rod (4.2), a hand wheel (4.3), a screw base (4.4), a connecting plate (4.5), a longitudinal sliding body (4.6), an adjusting bolt (4.7) and a vertical sliding body (4.8), the frame base (4.1) is fixedly installed on the base (1), the longitudinal sliding body (4.6) is slidably installed on the upper surface of the frame base (4.1) through a dovetail sliding groove structure, the connecting plate (4.5) is installed on the rear side of the longitudinal sliding body (4.6), and the head end of the screw rod (4.2) is rotatably connected to the connecting plate (4.5); the screw base (4.4) is installed on the upper surface of the frame base (4.1), the screw rod (4.2) is threadedly installed in the screw base (4.4), and the tail end of the screw rod (4.2) is installed with the hand wheel (4.3); the vertical sliding body (4.8) is slidably installed on the front surface of the longitudinal sliding body (4.6) through a dovetail sliding groove structure, the upper end of the longitudinal sliding body (4.6) is provided with an adjusting mounting table (4.6a), the adjusting mounting table (4.6a) is installed with the adjusting bolt (4.7), the back surface of the vertical sliding body (4.8) is provided with a connecting table (4.8a), the connecting table (4.8a) penetrates through the rear surface of the longitudinal sliding body (4.6) and is exposed outside, the lower end of the adjusting bolt (4.7) is threadedly connected to the connecting table (4.8a), and the reciprocating motion driving mechanism is fixedly installed on the vertical sliding body (4.8).

4. The bone traction automatic drill according to claim 1, wherein: The elastic pin (9) comprises a pin sleeve (9.1), a spring (9.2) and a pin column (9.3), the outer wall of the pin sleeve (9.1) is provided with external threads, the pin sleeve (9.1) is threadedly installed in the hammer head (6), the spring (9.2) and the pin column (9.3) are installed in the pin sleeve (9.1), the front end of the pin column (9.3) is provided with a pin head, the front end of the pin sleeve (9.1) is provided with a through hole, the pin head of the pin column (9.3) is exposed outside through the through hole, a step is arranged on the pin column (9.3) to prevent the pin column (9.3) from being pulled out, the spring (9.2) is sleeved on the rear part of the pin column (9.3), one end of the spring (9.2) is abutted against the inner side surface of the tail end of the pin sleeve (9.1), the other end of the spring (9.2) is connected to the pin column (9.3), and the spring (9.2) drives the pin head to be exposed outside through the through hole when no external force is applied; the tail end of the pin column (9.3) is installed with a metal block (9.4) that can be attracted by a magnet, or the pin column (9.3) is made of a metal material that can be attracted by a magnet.

5. The bone traction automatic drill according to claim 1, wherein: The damping cylinder (7) comprises an outer cylinder body (7.1) and a damping friction block (7.2), at least one groove is formed in the inner wall of the outer cylinder body (7.1) in the axial direction and penetrates through one end to the other end of the damping cylinder (7), the damping friction block (7.2) that is in shape is installed in the groove, a nut (7.3) is embedded in the back surface of the damping friction block (7.2), the outer cylinder body (7.1) is installed with an adjusting screw (7.4) that can rotate freely, and the inner end of the adjusting screw (7.4) is threadedly connected in the nut (7.3).

6. The bone traction automatic drill according to claim 1, wherein: The guide sleeve (16) is threadedly connected to the positioning ring (2) and can be detachably removed.

7. The bone traction automatic drill according to claim 1, wherein: One end of the fixed rod (3) is hinged with one side of the positioning ring (2), and the other end of the fixed rod (3) is provided with a connecting head (3a), the inner side surface of the connecting head (3a) is provided with a plurality of ratchet teeth (3b), the outer surface of the other side of the positioning ring (2) is provided with a clamping table (2c) for locking with the ratchet teeth (3b), and the outer side surface of the connecting head (3a) is provided with a pulling ring (3c) for unlocking by pulling the connecting head (3a) in the reverse direction.

8. The bone traction automatic drill according to claim 1, wherein: The bottom of the base (1) is provided with fixed bolts (18) at four corner positions.

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