Intramedullary broken rod taking-out device

Abstract

The utility model relates to the technical field of medical instruments, in particular to an intramedullary broken rod taking-out device which comprises an inner clamping and drawing part and an outer clamping and fixing part, the lower end of the outer clamping and fixing part is clamped and fixedly installed on the outer side of the upper end of a long tubular bone of a patient, and an outer tensioning part capable of fixing the size of an opening of the outer clamping and fixing part is arranged on the outer side of the upper portion of the outer clamping and fixing part. The utility model discloses reasonable and compact structure, convenient to use, it clamps and fixes the patient's long tubular bone immovable through the outer clamping fixed part, clamps and fixes the upper end of broken rod (broken nail or broken handle) through the inner clamping drawing part, and the inner clamping drawing part cooperates with the outer clamping fixed part action, can gradually pull the broken rod upwards, and it is convenient to use. Finally, the broken rod is taken out from the long tube marrow cavity of the patient; the device is high in operability, time-saving and labor-saving in the using process, the operation time for taking out the broken intramedullary nail in clinic and iatrogenic injury in the operation can be greatly shortened, and the pain of a patient is prevented from being additionally increased.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment and is a device for removing a broken intramedullary rod. Background Art

[0002] When treating a fracture, the doctor will usually reposition the fracture and fix the repositioned fracture with the help of medical devices; medical trauma nails, such as intramedullary nails, are usually used for fixation. Intramedullary nails are one of the commonly used internal fixation devices in orthopedic treatment and repair of femoral, tibia, and humeral shaft fractures. They help to speed up the healing of the fracture site by assuming part of the force on the patient's leg and reducing the stress directly borne by the bones at the fracture site. At the same time, they can help patients achieve early functional exercise and weight-bearing training as soon as possible, helping patients to restore the physiological function of their legs as soon as possible. Although intramedullary nails are very hard, they are also bound to break. Once broken, it means that the fracture cannot heal, and surgery is required to remove the part of the intramedullary nail remaining in the medullary cavity.

[0003] In the clinical field of orthopedics, after resection of malignant limb tumors and reconstruction with tumor-type prostheses, sudden exertion or rapid movement can place the stem under significant stress, potentially leading to stem breakage. This is particularly true when tumor-type artificial joints are used in children to reconstruct bone defects following tumor resection. As patients age and gain significant weight, the stem is subjected to significant stress. Thin stems, typically used in children due to the limited inner diameter of the medullary cavity, can break under these conditions.

[0004] Typically, the exposed portion of an intramedullary broken rod (i.e., a broken intramedullary nail or prosthetic stem, also referred to as a broken nail or broken stem, hereinafter referred to) is relatively short, and may even have threads or stop grooves on the outside, making it difficult for standard forceps to gain access. When this situation becomes difficult to remove, medical personnel often resort to cutting grooves in the bone to extract the remaining portion of the rod. This procedure is not only difficult and time-consuming, but also involves significant trauma, causing unnecessary pain to the patient. Summary of the Invention

[0005] The utility model provides a device for removing a broken intramedullary rod, which overcomes the shortcomings of the above-mentioned existing technologies. It can effectively solve the problems existing in the existing orthopedic clinical treatment process, such as the exposed part of the broken intramedullary rod is short, which is difficult to remove and may even require grooving on the bone for removal. The removal operation is time-consuming, labor-intensive and causes great damage, which additionally increases the pain of the patient.

[0006] The technical solution of the utility model is achieved through the following measures: an intramedullary broken rod removal device comprises an external clamping and fixing part and an internal clamping and pulling part, the lower end of the external clamping and fixing part is clamped and fixedly installed on the outer side of the upper end of the patient's long tubular bone, the upper outer side of the external clamping and fixing part is provided with an external tensioning part that can fix the opening size of the external clamping and fixing part; the external clamping and fixing part is sleeved with an internal clamping and pulling part that clamps the outer side of the upper end of the broken rod on the inner side of the lower end and can cooperate with the external clamping and fixing part to pull out the broken rod, the upper outer side of the internal clamping and pulling part is connected to the middle part of the upper end of the external clamping and fixing part, and the lower outer side of the internal clamping and pulling part is provided with an internal tensioning part that can fix the opening size of the internal clamping and pulling part.

[0007] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0008] The above-mentioned external clamping and fixing part may include a cross arm, a left outer pull foot and a right outer pull foot. The left part and the right part of the cross arm are respectively movably installed with the left outer pull foot and the right outer pull foot. The left outer pull foot includes a left pull rod and a left pawl. The upper end of the left pull rod is movably installed with the left part of the cross arm. The left pull rod can move along the left and right directions of the cross arm to adjust the opening size of the external clamping and fixing part. The lower end of the left pull rod is fixedly installed with a left pawl with its right end located to the right of the left pull rod. The right outer pull foot has the same structure as the left outer pull foot and is symmetrically distributed on the left and right sides.

[0009] The above-mentioned external tensioning part may include an external tensioning bolt and an external locking nut. A left external ear seat is provided on the upper front side and the upper rear side of the left outer pull leg. A right external ear seat is provided on the right outer pull leg corresponding to each left external ear seat position. A first through hole that passes through the left and right is provided in the middle of each right external ear seat. A second through hole that passes through the left and right is provided on the left external ear seat corresponding to each first through hole position. An external tensioning bolt with the right part located in the corresponding first through hole is provided in each second through hole. An external locking nut is screwed on the outer side of the right part of each external tensioning bolt, and the left end of each external locking nut is respectively against the right side of the corresponding right external ear seat.

[0010] The left outer pull leg may further include a claw, and a claw is provided on the upper side of the right end of the left outer pawl.

[0011] The upper portion of the left outer pull leg and the left portion of the cross arm can be hinged together, and the upper portion of the right outer pull leg and the right portion of the cross arm can be hinged together.

[0012] The above-mentioned internal clamping and pulling part may include a pulling screw rod, a crossbeam, a left inner pulling foot and a right inner pulling foot. A pulling screw hole that passes through the upper and lower parts is provided in the middle of the external clamping and fixing part. A pulling screw rod is provided in the pulling screw hole. The lower outer side of the pulling screw rod is screwed with a crossbeam. The crossbeam is located in the external clamping and fixing part. The left and right parts of the crossbeam are respectively movably installed with the left and right inner pulling feet. The left inner pulling foot is L-shaped and can move left and right along the crossbeam to adjust the opening size of the internal clamping and pulling part. The right inner pulling foot has the same structure as the left inner pulling foot and is symmetrically distributed left and right.

[0013] The above-mentioned internal tensioning part may include an internal tensioning bolt and an internal locking nut. A left inner ear seat is provided on the front side of the lower part and the rear side of the lower part of the left inner pull foot. A right inner ear seat is provided on the right inner pull foot corresponding to each left inner ear seat position. A third through hole is provided in the middle part of each right inner ear seat, and a fourth through hole is provided on the left inner ear seat corresponding to each third through hole position. An internal tensioning bolt with its right part located in the corresponding third through hole is provided in each fourth through hole. An internal locking nut is screwed on the outer side of the right part of each internal tensioning bolt, and the left end of each internal locking nut is respectively against the right side of the corresponding right inner ear seat.

[0014] The above-mentioned internal clamping and pulling part may also include a left adjusting bolt and a right adjusting bolt. A left adjusting screw hole opening to the left is provided in the middle of the left end of the beam, and a fifth through hole extending from left to right is provided on the left inner pulling foot corresponding to the position of the left adjusting screw hole. The left adjusting bolt with the right portion located in the left adjusting screw hole is provided in the fifth through hole. A right adjusting screw hole opening to the right is provided on the right end of the beam corresponding to the position of the left adjusting screw hole. A sixth through hole extending from left to right is provided on the right inner pulling foot corresponding to the position of the right adjusting screw hole. The right adjusting bolt with the left portion located in the right adjusting screw hole is provided in the sixth through hole.

[0015] The lower sides of the left inner pull foot and the right inner pull foot may be provided with an inclined angle slanting inwards and upwards.

[0016] The side of the left inner pull leg close to the broken rod and the side of the right inner pull leg close to the broken rod can be provided with arc-shaped inner clamping interfaces with opposite openings.

[0017] An operating handle may be fixedly mounted on the upper end of the drawing screw rod.

[0018] The utility model has a reasonable and compact structure and is easy to use. It clamps and fixes the patient's long bone by the external clamping and fixing part, and clamps and fixes the upper end of the broken rod (i.e., the broken nail or the broken handle) by the internal clamping and pulling part. The internal clamping and pulling part cooperates with the external clamping and fixing part to gradually pull the broken rod upward, and finally remove the broken rod from the patient's long bone marrow cavity. The device has strong operability, saves time and labor during use, can greatly reduce the operation time for removing broken intramedullary nails in clinical practice and iatrogenic injuries during the operation, and avoids additional pain for patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attachment Figure 1 This is a schematic diagram of the main view and partial cross-section structure of Examples 1-11 of the present invention.

[0020] The codes in the accompanying drawings are: 1 for the long tubular bone, 2 for the broken rod, 3 for the cross arm, 4 for the left pull rod, 5 for the left pawl, 6 for the external tensioning bolt, 7 for the external locking nut, 8 for the left outer ear seat, 9 for the right outer ear seat, 10 for the claw, 11 for the pulling screw, 12 for the cross beam, 13 for the left inner pull foot, 14 for the right inner pull foot, 15 for the inner tensioning bolt, 16 for the inner locking nut, 7 for the left inner ear seat, 18 for the right inner ear seat, 19 for the left adjusting bolt, 20 for the right adjusting bolt, 21 for the tilt angle, 22 for the operating handle, 23 for the right pull rod, and 24 for the right pawl. DETAILED DESCRIPTION

[0021] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0022] In this utility model, for the convenience of description, the relative position relationship of each component is described based on the Figure 1 For example, the positional relationships of front, back, up, down, left, and right are determined according to the layout directions of the drawings in the specification.

[0023] The present invention will be further described below in conjunction with the embodiments and accompanying drawings:

[0024] Example 1: As shown in the attached Figure 1 As shown, the intramedullary broken rod removal device includes an external clamping and fixing part and an internal clamping and pulling part. The lower end of the external clamping and fixing part is clamped and fixedly installed on the outer side of the upper end of the patient's long tubular bone 1, and the upper outer side of the external clamping and fixing part is provided with an external tensioning part that can fix the opening size of the external clamping and fixing part; the external clamping and fixing part is provided with an internal clamping and pulling part that clamps the outer side of the upper end of the broken rod 2 on the inner side of the lower end and can cooperate with the external clamping and fixing part to pull out the broken rod 2, the upper outer side of the internal clamping and pulling part is connected to the middle part of the upper end of the external clamping and fixing part, and the lower outer side of the internal clamping and pulling part is provided with an internal tensioning part that can fix the opening size of the internal clamping and pulling part.

[0025] During use, the opening of the outer clamping and fixing part is adjusted to be slightly larger than the outer diameter of the long tube bone 1, and then the outer side of the upper end of the long tube bone 1 is clamped by the inner side of the lower end of the outer clamping and fixing part, and the outer clamping and fixing part is locked by the outer tensioning part to fix the opening size of the outer clamping and fixing part to prevent the outer clamping and fixing part from detaching from the patient's long tube bone 1. The position of the inner clamping and pulling part is then adjusted so that the lower end of the inner clamping and pulling part is close to the upper end of the broken rod 2, and the opening of the inner clamping and pulling part is adjusted to be slightly larger than the outer diameter of the broken rod 2; then the outer side of the upper end of the broken rod 2 is clamped by the inner side of the lower end of the inner clamping and pulling part, and the inner clamping and pulling part is locked by the inner locking part to fix the opening size of the inner clamping and pulling part to prevent the inner clamping and pulling part from detaching from the broken rod 2 during the process of the inner clamping and pulling part moving upward to pull out the broken rod 2; the movement of the inner clamping and pulling part is controlled, and the broken rod 2 is gradually pulled upward in cooperation with the outer clamping and fixing part until the broken rod 2 is removed from the medullary cavity of the patient's long tube bone 1.

[0026] According to the needs, since the broken rod 2 (i.e. the broken nail or broken handle, the same below) is usually sleeved in the medullary cavity of the patient's long tube bone 1, there will naturally be a sleeve relationship between the internal tensioning part and the external tensioning part; the external clamping and fixing part can be realized by a plurality of pulling claws evenly hinged on the flange in the prior art, and the lower end of each pulling claw is hooked, so that the pulling claw can clamp the outside of the long tube bone 1 or hook the end of the long tube bone 1, and its structure can also be realized by the puller structure in the prior art. At this time, the external tensioning part can be realized by the latch-type quick clamp structure in the prior art.

[0027] According to the needs, the inner clamping and pulling part may include a U-shaped frame sleeved in the outer clamping and fixing part, a three-jaw chuck fixedly installed on the inner side of the lower end of the U-shaped frame, two connecting rods, a transverse connecting rod and a top pressure screw. The upper end of the outer clamping and fixing part may be symmetrically provided with at least two connecting holes that pass through the upper and lower parts. Each connecting hole may be provided with a connecting rod whose lower end is fixedly installed with the corresponding position of the upper side of the U-shaped frame. The upper ends of the two connecting rods may be fixedly installed with a transverse connecting rod, and the middle of the transverse connecting rod may be provided with an upper The cam is secured to the outside of the drawer by means of a lever, and the lever is secured to the outside of the drawer by means of a lever, and the lever is secured to the outside of the drawer by means of a lever.

[0028] The utility model has a reasonable and compact structure and is easy to use. It clamps and fixes the patient's long tubular bone 1 by the external clamping and fixing part, and clamps and fixes the upper end of the broken rod 2 by the internal clamping and pulling part. The internal clamping and pulling part cooperates with the external clamping and fixing part to gradually pull the broken rod 2 upward, and finally remove the broken rod 2 from the medullary cavity of the patient's long tubular bone 1. The device has strong operability, can greatly reduce the operation time for removing broken intramedullary nails in clinical practice and iatrogenic injuries during the operation, and avoid additional pain for patients.

[0029] The above intramedullary broken rod removal device can be further optimized and / or improved according to actual needs:

[0030] Example 2: As shown in the attached Figure 1 As shown, the outer clamping fixing part includes a cross arm 3, a left outer pull foot and a right outer pull foot. The left part of the cross arm 3 and the right part of the cross arm 3 are respectively movably installed with the left outer pull foot and the right outer pull foot. The left outer pull foot includes a left pull rod 4 and a left pawl 5. The upper end of the left pull rod 4 is movably installed with the left part of the cross arm 3. The left pull rod 4 can move along the left and right directions of the cross arm 3 to adjust the opening size of the outer clamping fixing part. The lower end of the left pull rod 4 is fixedly installed with a left pawl 5 with the right end located to the right of the left pull rod 4. The right outer pull foot has the same structure as the left outer pull foot and is symmetrically distributed on the left and right.

[0031] As needed, since the right and left outer legs have the same structure and are symmetrically arranged, the right outer leg can be composed of a right pull rod 23 and a right pawl 24. Furthermore, to enhance the grip between the left and right pawls 5 and 24 and the patient's long bone 1, both the left and right pawls 5 and 24 can be provided with inwardly facing, curved, external engaging notches on their sides near the long bone 1. In this embodiment, the left pawl 5 and left pull rod 4, as well as the right pawl 24 and right pull rod 23, can be integrally formed by bending sheet metal. The movable installation method between the cross arm 3 and the left outer pull leg and the right outer pull leg can provide a connecting hole on the upper part of the left outer pull leg and the right outer pull leg that is compatible with the shape of the cross beam 12, so that the upper part of the left outer pull leg and the right outer pull leg can be mounted on the cross beam 12, so that the left outer pull leg and the right outer pull leg can slide left and right along the cross beam 12; a slide groove can also be provided on the lower side of the cross beam 12, and the slide groove can be a dovetail groove or a T-slot, etc. At this time, the shape of the upper end of the left outer pull leg and the right outer pull leg is compatible with the shape of the slide groove, and the upper ends of the left outer pull leg and the right outer pull leg can be installed outside the slide groove to enable the two to move left and right along the slide groove; in this embodiment, the cross arm 3 and the left outer pull leg and the right outer pull leg can also be realized by the hinge in the existing technology, and the external tensioning part can be realized by the latch-type quick clamp structure in the existing technology.

[0032] During use, hold the cross arm 3 and adjust the external tensioning part so that the opening distance between the right end of the left ratchet 5 and the left end of the right ratchet 24 is slightly larger than the outer diameter of the patient's long tubular bone 1; then move the left external pulling foot and the right external pulling foot left and right so that the right end of the left ratchet 5 and the left end of the right ratchet 24 can just clamp the corresponding position of the outer side of the patient's long tubular bone 1 from the left and right directions. At this time, adjust the external tensioning part again so that the right end of the left ratchet 5 and the left end of the right ratchet 24 can reliably clamp the outer side of the patient's long tubular bone 1 without loosening; thereby actuating the internal clamping and pulling part that clamps the upper end of the broken rod 2, and quickly removing the broken rod 2 from the patient's medullary cavity.

[0033] Example 3: As shown in the attached Figure 1 As shown, the external tensioning part includes an external tensioning bolt 6 and an external locking nut 7. A left external ear seat 8 is provided on the upper front side and the upper rear side of the left external pull foot. A right external ear seat 9 is provided on the right external pull foot corresponding to each position of the left external ear seat 8. A first through hole that passes through the left and right is provided in the middle of each right external ear seat 9. A second through hole that passes through the left and right is provided on the left external ear seat 8 corresponding to each position of the first through hole. Each second through hole is provided with an external tensioning bolt 6 with the right part located in the corresponding first through hole. An external locking nut 7 is screwed on the outer side of the right part of each external tensioning bolt 6, and the left end of each external locking nut 7 is respectively against the right side of the corresponding right external ear seat 9.

[0034] During use, the outer locking nut 7 is loosened so that the opening distance between the right lower end of the left outer leg and the left lower end of the right outer leg is slightly larger than the outer diameter of the patient's long bone 1, and the outer locking nut 7 is stopped. The outer locking nut 7 is then tightened in the opposite direction so that the right lower end of the left outer leg and the left lower end of the right outer leg can reliably clamp the outer side of the patient's long bone 1 without loosening. In this embodiment, the bolt and nut tensioning device is easy to adjust, simple to use, and provides a reliable tensioning effect.

[0035] Example 4: As shown in the attached Figure 1 As shown, the left outer pull leg further includes a claw 10, and a claw 10 is provided on the upper side of the right end of the left outer pawl.

[0036] By setting it this way, the claw 10 can help the left and right outer pull legs to better fix the patient's long bone 1 and prevent it from slipping. According to needs, in order to adapt to more working conditions, the claw 10 and the corresponding outer pull legs can be assembled together in a detachable connection manner.

[0037] Example 5: As shown in the attached Figure 1 As shown, the upper portion of the left outer pull leg is hinged to the left portion of the cross arm 3, and the upper portion of the right outer pull leg is hinged to the right portion of the cross arm 3.

[0038] By setting it in this way, the opening distance between the left outer pulling leg and the right outer pulling leg can be adjusted more quickly, thereby saving operation time.

[0039] Example 6: As shown in the attached Figure 1As shown, the inner clamping and drawing part includes a pulling screw rod 11, a cross beam 12, a left inner pulling foot 13 and a right inner pulling foot 14. A pulling screw hole that passes through the upper and lower parts is provided in the middle of the outer clamping and fixing part. The pulling screw rod 11 is provided in the pulling screw hole. The lower outer side of the pulling screw rod 11 is screwed with a cross beam 12. The cross beam 12 is located in the outer clamping and fixing part. The left and right parts of the cross beam 12 are respectively movably installed with the left inner pulling foot 13 and the right inner pulling foot 14. The left inner pulling foot 13 is L-shaped. The left inner pulling foot 13 can move left and right along the cross beam 12 to adjust the opening size of the inner clamping and drawing part. The right inner pulling foot 14 has the same structure as the left inner pulling foot 13 and is symmetrically distributed on the left and right sides.

[0040] During use, hold the crossbeam 12 and rotate the upper end of the pulling wire rod 11, so that the lower ends of the left inner pulling foot 13 and the right inner pulling foot 14 can gradually approach the upper end of the broken rod 2. When the lower ends of the left inner pulling foot 13 and the right inner pulling foot 14 pass downward over the upper end of the broken rod 2, stop rotating the pulling wire rod 11; adjust the inner tensioning part so that the opening distance between the right lower end of the left inner pulling foot 13 and the left lower end of the right inner pulling foot 14 is slightly larger than the outer diameter of the upper end of the broken rod 2, and then move the left inner pulling foot 13 and the right inner pulling foot 14 left and right so that the right lower end of the left inner pulling foot 13 and the left lower end of the right inner pulling foot 14 It can just clamp the corresponding position of the outer side of the upper end of the broken rod 2 from the left and right directions. At this time, adjust the internal tensioning part again so that the lower right end of the left inner pulling foot 13 and the lower left end of the right inner pulling foot 14 can reliably clamp the outer side of the upper end of the broken rod 2 without loosening; rotate the upper end of the pulling wire rod 11 in the opposite direction so that the crossbeam 12 can gradually move upward along the axial direction of the pulling wire rod 11. At this time, the crossbeam 12 can synchronously drive the left inner pulling foot 13 and the right inner pulling foot 14 to move upward together, thereby gradually pulling the broken rod 2 out of the patient's medullary cavity, wherein the movement principle between the crossbeam 12 and the pulling wire rod 11 is similar to that of the screw pair.

[0041] Compared with the existing technology, this device can simply, safely, quickly and labor-savingly remove broken intramedullary nails or broken prosthesis handles without increasing the surgical trauma to the patient, without increasing the difficulty of the operation and additional trauma to the patient, and avoiding additional pain for the patient.

[0042] Depending on the requirements, the movable connection between the crossbeam 12 and the left and right inner legs 13, 14 can be hinged as in the prior art. Alternatively, connecting holes can be provided on the upper portions of the left and right inner legs 13, 14 to match the shape of the crossbeam 12, allowing the upper portions of the left and right inner legs 13, 14 to be fitted onto the crossbeam 12, allowing the left and right inner legs 13, 14 to slide left and right along the crossbeam 12. Alternatively, a sliding groove can be provided on the lower side of the crossbeam 12, such as a dovetail groove or T-slot. In this case, the upper ends of the left and right inner legs 13, 14 can be shaped to match the shape of the sliding groove, allowing them to be installed in the sliding groove to move left and right along the sliding groove. The internal tensioning portion can be implemented using a latch-type quick-clamp structure as in the prior art. In order to facilitate the operation of the wrench, the outer side of the upper end of the pulling screw rod 11 can be provided with a wrench platform or a wrench groove with a drum-shaped, square or hexagonal cross section.

[0043] Example 7: As shown in the attached Figure 1 As shown, the inner tensioning part includes an inner tensioning bolt 15 and an inner locking nut 16. A left inner ear seat 17 is provided on the front and rear sides of the lower part of the left inner pull foot 13. A right inner ear seat 18 is provided on the right inner pull foot 14 corresponding to each position of the left inner ear seat 17. A third through hole that passes through the left and right is provided in the middle of each right inner ear seat 18. A fourth through hole that passes through the left and right is provided on the left inner ear seat 17 corresponding to each position of the third through hole. Each fourth through hole is provided with an inner tensioning bolt 15 whose right part is located in the corresponding third through hole. An inner locking nut 16 is screwed on the outer side of the right part of each inner tensioning bolt 15, and the left end of each inner locking nut 16 is respectively against the right side of the corresponding right inner ear seat 18.

[0044] During use, by loosening the inner locking nut 16, the opening distance between the right lower end of the left inner pull leg 13 and the left lower end of the right inner pull leg 14 can be slightly larger than the outer diameter of the upper end of the broken rod 2, and the rotation of the inner locking nut 16 is stopped; by tightening the inner locking nut 16 in the opposite direction, the right lower end of the left inner pull leg 13 and the left lower end of the right inner pull leg 14 can reliably clamp the outer side of the upper end of the broken rod 2 without loosening. In this embodiment, the tensioning device of the bolt and nut is easy to adjust, simple to use, and has a reliable tensioning effect.

[0045] Example 8: As shown in the attached Figure 1 As shown, the inner clamping and pulling part also includes a left adjusting bolt 19 and a right adjusting bolt 20. A left adjusting screw hole opening to the left is provided in the middle of the left end of the beam 12, and a fifth through hole extending from left to right is provided on the left inner pulling foot 13 corresponding to the position of the left adjusting screw hole, and the left adjusting bolt 19 with the right portion located in the left adjusting screw hole is provided in the fifth through hole; a right adjusting screw hole opening to the right is provided at the right end of the beam 12 corresponding to the position of the left adjusting screw hole, and a sixth through hole extending from left to right is provided on the right inner pulling foot 14 corresponding to the position of the right adjusting screw hole, and the right adjusting bolt 20 with the left portion located in the right adjusting screw hole is provided in the sixth through hole.

[0046] During use, by adjusting the connection length between the left adjusting bolt 19, the right adjusting bolt 20 and the crossbeam 12, the distance between the left inner pulling foot 13 and the right inner pulling foot 14, that is, the opening size of the inner clamping and pulling part, can be quickly adjusted, so that the opening size of the lower end of the inner clamping and pulling part is adapted to the outer diameter of the upper end of the broken rod 2, and then the outer side of the upper end of the broken rod 2 can be quickly clamped, and finally the broken rod 2 can be reliably and quickly removed from the medullary cavity.

[0047] According to requirements, when the cross beam 12 is wider, two left adjusting bolts 19 and two right adjusting bolts 20 may be provided at intervals in the front and rear directions.

[0048] Example 9: As shown in the attached Figure 1 As shown, the lower sides of the left inner pull leg 13 and the right inner pull leg 14 are both provided with an inclined angle 21 that is inclined inwardly and upwardly.

[0049] Through such a setting, the inclined angle 21 can reduce the difficulty of the left inner pull leg 13 and the right inner pull leg 14 hooking the broken rod 2, further improve the stability of the left inner pull leg 13 and the right inner pull leg 14 when assembled on the broken rod 2, and effectively reduce the risk of the device being accidentally separated from the broken rod 2.

[0050] Example 10: As shown in the attached Figure 1 As shown, the side of the left inner pull leg 13 close to the broken rod 2 and the side of the right inner pull leg 14 close to the broken rod 2 are both provided with arc-shaped inner clamping interfaces with openings facing each other.

[0051] During use, the two arc-shaped internal card interfaces with opposite openings can effectively increase the contact area between the left inner pull foot 13, the right inner pull foot 14 and the outer side of the broken rod 2, thereby increasing the friction between the left inner pull foot 13, the right inner pull foot 14 and the broken rod 2, and effectively preventing the left inner pull foot 13 and the right inner pull foot 14 from slipping.

[0052] Example 11: As shown in the attached Figure 1 As shown, an operating handle 22 is fixedly mounted on the upper end of the drawing screw rod.

[0053] By setting it in this way, the operating handle 22 is more convenient to directly rotate the drawing screw by hand, thereby quickly taking out the broken rod 2 from the medullary cavity. In this embodiment, the operating handle 22 can be a rod-shaped handle.

[0054] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A device for removing a broken rod in the medullary cavity, characterized in that: It includes an external clamping and fixing part and an internal clamping and pulling part. The lower end of the external clamping and fixing part is clamped and fixedly installed on the outer side of the upper end of the patient's long tubular bone. The outer side of the upper part of the external clamping and fixing part is provided with an external tensioning part that can fix the opening size of the external clamping and fixing part. The outer clamping fixing portion includes a cross arm, a left outer pull leg and a right outer pull leg. The left outer pull leg and the right outer pull leg are movably installed on the left and right parts of the cross arm respectively. The left outer pull leg includes a left pull rod and a left pawl. The upper end of the left pull rod is movably installed with the left part of the cross arm. The left pull rod can move left and right along the cross arm to adjust the opening size of the outer clamping fixing portion. The lower end of the left pull rod is fixedly installed with a left pawl with the right end located to the right of the left pull rod. The right outer pull leg has the same structure as the left outer pull leg and is symmetrically distributed left and right. The outer clamping and fixing part is sleeved with an inner clamping and pulling part which is capable of clamping the outer side of the upper end of the broken rod on the inner side of the lower end and can cooperate with the outer clamping and fixing part to pull out the broken rod. The outer side of the upper end of the inner clamping and pulling part is connected to the middle part of the upper end of the outer clamping and fixing part. The outer side of the lower end of the inner clamping and pulling part is provided with an inner tensioning part which can fix the opening size of the inner clamping and pulling part. The inner clamping and pulling part includes a pulling screw rod, a crossbeam, a left inner pulling foot and a right inner pulling foot. A pulling screw hole that passes through the upper and lower parts is provided in the middle of the outer clamping and fixing part. A pulling screw rod is provided in the pulling screw hole. The lower outer side of the pulling screw rod is screwed with a crossbeam. The crossbeam is located in the outer clamping and fixing part. The left and right parts of the crossbeam are respectively movably installed with the left inner pulling foot and the right inner pulling foot. The left inner pulling foot is L-shaped and can move left and right along the crossbeam to adjust the opening size of the inner clamping and pulling part. The right inner pulling foot has the same structure as the left inner pulling foot and is symmetrically distributed left and right.

2. The intramedullary broken rod removal device according to claim 1, characterized in that: The external tensioning part includes an external tensioning bolt and an external locking nut. A left external ear seat is provided on the upper front side and the upper rear side of the left outer pull leg. A right external ear seat is provided on the right outer pull leg corresponding to each left external ear seat position. A first through hole is provided in the middle of each right external ear seat, and a second through hole is provided on the left external ear seat corresponding to each first through hole position. Each second through hole is provided with an external tensioning bolt with the right part located in the corresponding first through hole. An external locking nut is screwed on the outer side of the right part of each external tensioning bolt, and the left end of each external locking nut is respectively against the right side of the corresponding right external ear seat.

3. The intramedullary broken rod removal device according to claim 2, characterized in that: The left outer pulling foot also includes a claw, and the upper side of the right end of the left outer ratchet is provided with a claw.

4. The intramedullary broken rod removal device according to claim 2 or 3, characterized in that: The upper portion of the left outer pull leg is hinged to the left portion of the cross arm, and the upper portion of the right outer pull leg is hinged to the right portion of the cross arm.

5. The intramedullary broken rod removal device according to any one of claims 1 to 3, characterized in that: The inner tensioning part includes an inner tensioning bolt and an inner locking nut. A left inner ear seat is provided on the front side of the lower part and the rear side of the lower part of the left inner pull foot. A right inner ear seat is provided on the right inner pull foot corresponding to each left inner ear seat position. A third through hole is provided in the middle of each right inner ear seat, and a fourth through hole is provided on the left inner ear seat corresponding to each third through hole position. An inner tensioning bolt with the right part located in the corresponding third through hole is provided in each fourth through hole. An inner locking nut is screwed on the outer side of the right part of each inner tensioning bolt, and the left end of each inner locking nut is respectively against the right side of the corresponding right inner ear seat.

6. The intramedullary broken rod removal device according to claim 4, characterized in that: The inner tensioning part includes an inner tensioning bolt and an inner locking nut. A left inner ear seat is provided on the front side of the lower part and the rear side of the lower part of the left inner pull foot. A right inner ear seat is provided on the right inner pull foot corresponding to each left inner ear seat position. A third through hole is provided in the middle of each right inner ear seat, and a fourth through hole is provided on the left inner ear seat corresponding to each third through hole position. An inner tensioning bolt with the right part located in the corresponding third through hole is provided in each fourth through hole. An inner locking nut is screwed on the outer side of the right part of each inner tensioning bolt, and the left end of each inner locking nut is respectively against the right side of the corresponding right inner ear seat.

7. The intramedullary broken rod removal device according to claim 5, characterized in that: The inner clamping and pulling part also includes a left adjusting bolt and a right adjusting bolt. A left adjusting screw hole opening to the left is provided in the middle of the left end of the beam, and a fifth through hole extending from left to right is provided on the left inner pulling foot corresponding to the position of the left adjusting screw hole. The left adjusting bolt with the right portion located in the left adjusting screw hole is provided in the fifth through hole. A right adjusting screw hole opening to the right is provided on the right end of the beam corresponding to the position of the left adjusting screw hole. A sixth through hole extending from left to right is provided on the right inner pulling foot corresponding to the position of the right adjusting screw hole. The right adjusting bolt with the left portion located in the right adjusting screw hole is provided in the sixth through hole.

8. The intramedullary broken rod removal device according to claim 6, characterized in that: The inner clamping and pulling part also includes a left adjusting bolt and a right adjusting bolt for adjusting the opening size of the left inner pulling foot and the right pulling foot. A left adjusting screw hole opening to the left is provided in the middle of the left end of the beam, and a fifth through hole extending from left to right is provided on the left inner pulling foot corresponding to the position of the left adjusting screw hole. The left adjusting bolt with the right portion located in the left adjusting screw hole is provided in the fifth through hole. A right adjusting screw hole opening to the right is provided on the right end of the beam corresponding to the position of the left adjusting screw hole. A sixth through hole extending from left to right is provided on the right inner pulling foot corresponding to the position of the right adjusting screw hole. The right adjusting bolt with the left portion located in the right adjusting screw hole is provided in the sixth through hole.

9. The intramedullary broken rod removal device according to any one of claims 6 to 8, characterized in that: The lower sides of the left inner pull-foot and the right inner pull-foot are both provided with an inclined angle slanting inwards and upwards; Or / and, the side of the left inner pull leg close to the broken rod and the side of the right inner pull leg close to the broken rod may be provided with an inner card interface with an inward opening and an arc shape; Or / and, an operating handle is fixedly installed on the upper end of the drawing screw rod.

10. The intramedullary broken rod removal device according to claim 5, characterized in that: The lower sides of the left inner pull-foot and the right inner pull-foot are both provided with an inclined angle slanting inwards and upwards; Or / and, the right lower end of the left inner pull leg and the left lower end of the right inner pull leg are both provided with an arc-shaped notch opening inward; Or / and, an operating handle is fixedly installed on the upper end of the drawing screw rod.

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