Articulated bidirectional intramedullary fixing device

Abstract

The invention provides a hinged type bidirectional intramedullary fixing device, and belongs to the technical field of medical instruments. Comprising a primary screw and a secondary screw mounted on the inner side of the primary screw, the number of the guide needles is two, and the guide needles are arranged on the inner side of the primary screw and the inner side of the secondary screw respectively. The number of the auxiliary guide mechanisms is two, and the two auxiliary guide mechanisms are arranged on the inner side of the primary screw and the inner side of the secondary screw correspondingly and used for guiding the primary screw and the secondary screw in the insertion process. The auxiliary guide mechanism comprises limiting grooves formed in the inner side of the primary screw and the inner side of the secondary screw respectively. According to the bone fracture fixing device, through cooperation of parts such as the primary screw and the secondary screw, efficient fixation of a bone fracture part is achieved, so that the overall stability of the device is enhanced, meanwhile, the necessity of a secondary operation is reduced through the operation fixing mode, and the operation convenience of workers is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more specifically, to an articulated bidirectional intramedullary fixation device. Background Art

[0002] The intramedullary fixation system is a medical device mainly used for internal fixation of small bones and joint structures in the hands and feet. It promotes the healing of the fracture site by providing stable support and fixation. The working principle of the intramedullary fixation device is to insert screws into the small bones and joint structures of the fractured hands and feet, and use the locking mechanism of the screws to fix the two ends of the fracture together.

[0003] The existing intramedullary fixation device only inserts screws unidirectionally. However, when the finger joint of a patient is fractured, the existing intramedullary fixation device realizes the fixation operation of the patient's finger joint through the cooperation of screws and a steel plate. This operation requires the patient to undergo a second operation after the operation, resulting in a longer postoperative recovery time for the patient. Therefore, we provide an articulated bidirectional intramedullary fixation device to solve the above problems. Summary of the Invention

[0004] Aiming at the problem that the existing intramedullary fixation device only inserts screws unidirectionally and the cooperation with the steel plate to form a fixation operation is relatively cumbersome, the purpose of the present invention is to provide an articulated bidirectional intramedullary fixation device.

[0005] To solve the above problems, the present invention adopts the following technical solutions:

[0006] An articulated bidirectional intramedullary fixation device, comprising: a mother screw and a son screw installed inside the mother screw; a guide pin, two guide pins are provided, and are respectively arranged inside the mother screw and the son screw; an auxiliary guiding mechanism, two auxiliary guiding mechanisms are provided, and the two auxiliary guiding mechanisms are respectively arranged inside the mother screw and the son screw, and are used to guide the mother screw and the son screw during the insertion process. The auxiliary guiding mechanism includes limiting grooves respectively opened inside the mother screw and the son screw, and the inner diameter of the limiting groove is larger than the diameter of the guide pin;

[0007] A suction mechanism is arranged inside the limiting groove and is used to suck impurities inside the limiting groove.

[0008] Optionally, a tapered column is fixedly connected to one side of the son screw, and one end of the tapered column is tapered. A rotation groove is opened inside the mother screw, and the inner diameter of the rotation groove is larger than the tapered bottom diameter of the tapered column and smaller than the tapered top diameter of the tapered column.

[0009] Optionally, the auxiliary guiding mechanism includes multiple groups of second sliding grooves formed on the inner side of the limiting groove. Each group of the second sliding grooves has four, and the four second sliding grooves are annularly distributed on the inner side of the limiting groove. A spherical rod is slidably connected to the inner side of each second sliding groove.

[0010] Optionally, one end of the spherical rod is set as a spherical surface, and the spherical surface protrudes inside the female screw.

[0011] Optionally, cutting threads are provided on the inner side of the limiting groove. The inner side of the cutting threads is attached to the outer wall of the guiding needle, and the initial length of the spherical rod is greater than the width of the cutting threads.

[0012] Optionally, the suction mechanism includes multiple groups of first sliding grooves formed on the inner side of the limiting groove and communicating with the second sliding grooves. A piston ring is slidably connected to the inner side of the first sliding groove, and one end of the piston ring is fixedly connected to the spherical rod. A compression spring is installed between the piston ring and the inner side of the first sliding groove.

[0013] Optionally, the suction mechanism includes multiple groups of first connecting grooves formed on the inner side of the limiting groove and communicating with the first sliding grooves. An exhaust groove is formed in the inner side of the female screw, and the exhaust groove communicates with the first connecting grooves. An exhaust valve is installed at one end of the exhaust groove.

[0014] Optionally, a suction groove is formed in the inner side of the female screw. Multiple third connecting grooves are formed in the inner side of the suction groove, and each third connecting groove communicates with one of the second sliding grooves. Multiple annularly distributed circular grooves are formed in the inner side of the female screw. A second connecting groove communicating with the suction groove is formed at the top of the circular groove, and a circular suction groove communicating with the limiting groove is formed at the bottom of the circular groove. The notch of the circular suction groove is obliquely arranged towards the cutting threads.

[0015] Compared with the prior art, the technical solution provided by the present invention has at least the following beneficial effects:

[0016] In the above solution, through the cooperation of components such as the spherical rod, during the process of screwing the female screw and the male screw into the bone, when the spherical surface at the end of the spherical rod contacts the guiding needle, the spherical rod contracts towards the inner side of the second sliding groove under the resistance, and at the same time, under the action of the compression spring, the spherical rod can always abut against the outer wall of the guiding needle, thereby guiding the screwing of the female screw and the male screw into the bone, enhancing the accuracy of the insertion of the female screw and the male screw. At the same time, after the female screw and the male screw are screwed into the bone, under the action of the spherical rod, the structural strength between the female screw and the male screw and the guiding needle is enhanced, thereby improving the overall stability of the device;

[0017] By setting the cooperation of parts such as the mother screw and the son screw, after the doctor screws the mother screw along the outer wall of the guiding needle into the bone, the son screw can rotate a certain angle along the rotating groove, so that the doctor can rotate different angles according to different patients, thereby improving the applicability of the device. At the same time, after the doctor adjusts the angle, the son screw is screwed into the corresponding broken bone along the other guiding needle. During this process, when the conical column is gradually screwed into the inner side of the rotating groove, and the conical column is inserted into the inside of the rotating groove, the mother screw and the son screw are fixed, thereby realizing efficient fixation of the fracture site, enhancing the overall stability of the device. At the same time, this operation and fixation method reduces the necessity of secondary surgery and improves the convenience of the staff's operation;

[0018] By the cooperation of parts such as the cutting thread, when the doctor screws the mother screw and the son screw along the guiding needle into the inside of the bone, under the action of the cutting thread, the bone stuck inside the limiting groove can be cut, thereby reducing the resistance suffered by the doctor when screwing in the mother screw and the son screw. At the same time, it also makes the mother screw and the son screw enter the bone more smoothly and fit better with the bone, thereby realizing a more stable fixation effect;

[0019] By the cooperation of parts such as the circular suction groove, when the guiding needle pushes the spherical rod into the inside of the second sliding groove, it simultaneously drives the piston ring to move towards the direction of the first connecting groove, so that a negative pressure state is formed inside the second sliding groove, thereby creating suction on the third connecting groove. At the same time, the bone chips generated by cutting inside the limiting groove can be sucked into the inside of the circular groove through the circular suction groove, thereby ensuring the cleanliness of the space inside the limiting groove. At the same time, it also prevents the bone chips inside the limiting groove from falling into the bone and affecting the recovery of the bone, reducing the risk of patient infection, and enhancing the overall practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present invention and, together with the specification, are further used to explain the principles of the present invention and enable those skilled in the relevant art to implement and use the present invention.

[0021] Figure 1 It is a schematic structural diagram of the present invention;

[0022] Figure 2 It is a schematic structural diagram of the mother screw of the present invention;

[0023] Figure 3 It is a partial structural diagram of the mother screw of the present invention;

[0024] Figure 4 Schematic diagram of the spherical rod structure of the present invention;

[0025] Figure 5 Schematic diagram of the exhaust groove structure of the present invention;

[0026] Figure 6 Schematic diagram of the suction mechanism structure of the present invention;

[0027] Figure 7 Partial structure schematic diagram of the suction mechanism of the present invention;

[0028] Figure 8 Schematic diagram of the rotation groove structure of the present invention;

[0029] Figure 9 Schematic diagram of the thread cutting structure of the present invention.

[0030] [Reference numerals]

[0031] 1, female screw; 2, male screw; 3, guide pin; 4, limiting groove; 5, rotation groove; 6, first sliding groove; 7, exhaust groove; 8, first connecting groove; 9, piston ring; 10, spherical rod; 11, circular groove; 12, compression spring; 13, conical column; 14, exhaust valve; 15, second sliding groove; 16, second connecting groove; 17, suction groove; 18, circular suction groove; 19, third connecting groove; 20, thread cutting.

[0032] As shown in the figure, in order to clearly implement the structure of the embodiments of the present invention, specific structures and devices are marked in the figure, but this is only for schematic purposes and is not intended to limit the present invention to this specific structure, device and environment. Those of ordinary skill in the art can adjust or modify these devices and environments according to specific needs. Detailed implementation manners

[0033] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0034] It should be noted that in the specification, references to "an embodiment", "embodiments", "exemplary embodiments", "some embodiments", etc. indicate that the described embodiments may include a particular feature, structure, or characteristic, but not necessarily every embodiment includes that particular feature, structure, or characteristic. Additionally, when a particular feature, structure, or characteristic is described in connection with an embodiment, implementing such feature, structure, or characteristic in connection with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the relevant art.

[0035] Generally, terms can be understood, at least in part, from their use in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or can be used to describe a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood to not necessarily be intended to convey a set of exclusive factors, but rather, depending at least in part on the context, can alternatively allow for the existence of other factors that are not necessarily explicitly described.

[0036] It can be understood that the meanings of "on", "above", and "over" in the present invention should be construed in the broadest manner such that "on" not only means "directly on" something, but also includes the meaning of being "on" something with intervening features or layers therebetween, and "above" or "over" not only means "above" or "over" something, but also can include the meaning of being "above" or "over" something with no intervening features or layers therebetween.

[0037] Furthermore, spatial relative terms such as "under", "below", "lower", "above", "upper", etc. are used herein for convenience of description to describe the relationship of one element or feature to another or other elements or features, as shown in the figures. The spatial relative terms are intended to cover different orientations in the use or operation of the device in addition to the orientation depicted in the figures. The device may be otherwise oriented, and the spatial relative descriptors used herein may be interpreted correspondingly.

[0038] Such as Figures 1 to 9As shown in the figure, an embodiment of the present invention provides an articulated bidirectional intramedullary fixation device, including: a mother screw 1 and a son screw 2 installed inside the mother screw 1; a guide pin 3, there are two guide pins 3, which are respectively arranged inside the mother screw 1 and the son screw 2; an auxiliary guiding mechanism, there are two auxiliary guiding mechanisms, and the two auxiliary guiding mechanisms are respectively arranged inside the mother screw 1 and the son screw 2, and are used to guide the mother screw 1 and the son screw 2 during the insertion process. The auxiliary guiding mechanism includes limiting grooves 4 respectively opened inside the mother screw 1 and the son screw 2, and the inner diameter of the limiting groove 4 is larger than the diameter of the guide pin 3; one end of the spherical rod 10 is set as a spherical surface, and the spherical surface protrudes inside the mother screw 1.

[0039] First, the doctor needs to insert the guide pin 3 into the corresponding positions at both ends of the broken bone in the human body with the cooperation of imaging technology. After the guide pin 3 is inserted into the inner sides of both ends of the broken bone, then the doctor screws the mother screw 1 and the son screw 2 into the bone along the outer wall direction of the guide pin 3 in sequence. During the process of screwing the mother screw 1 and the son screw 2 into the bone, the guide pin 3 can calibrate and guide the mother screw 1 and the son screw 2, so that the doctor does not have to continuously calibrate the positions of the mother screw 1 and the son screw 2 by observing the position of the guide pin 3 through imaging technology, thereby reducing the operation difficulty of the doctor. At the same time, due to the guiding effect of the guide pin 3, the positioning accuracy of the mother screw 1 and the son screw 2 is enhanced, thereby improving the overall practicability of the device.

[0040] The auxiliary guiding mechanism includes multiple groups of second sliding grooves 15 opened inside the limiting groove 4. Each group of the second sliding grooves 15 has four, and the four second sliding grooves 15 are annularly distributed inside the limiting groove 4. A spherical rod 10 is slidably connected inside each second sliding groove 15.

[0041] During the process of screwing the mother screw 1 and the son screw 2 into the inner side of the bone, when the spherical surface at the end of the spherical rod 10 contacts the guide pin 3, the spherical rod 10 is subjected to resistance and contracts towards the inside of the second sliding groove 15. At the same time, under the action of the compression spring 12, the spherical rod 10 can always abut against the outer wall of the guide pin 3, so as to guide the mother screw 1 and the son screw 2 into the bone, thereby enhancing the accuracy of inserting the mother screw 1 and the son screw 2. At the same time, after the mother screw 1 and the son screw 2 are screwed into the inner side of the bone, under the action of the spherical rod 10, the structural strength between the mother screw 1 and the son screw 2 and the guide pin 3 is enhanced, thereby improving the overall stability of the device.

[0042] Such asFigure 1 and Figure 8 As shown in Figure 8 , one side of the sub-screw 2 is fixedly connected with a conical column 13, and one end of the conical column 13 is conical. An inner side of the mother screw 1 is provided with a rotating groove 5, and an inner diameter of the rotating groove 5 is larger than a conical bottom diameter of the conical column 13 and smaller than a conical top diameter of the conical column 13.

[0043] After the doctor screws the mother screw 1 along an outer wall of the guide pin 3 into the bone, the sub-screw 2 can rotate a certain angle along the rotating groove 5, so that the doctor can rotate different angles according to different patients, thereby improving applicability of the device. At the same time, after the doctor adjusts the angle, the sub-screw 2 is screwed into the corresponding broken bone along the other guide pin 3. During this process, when the conical column 13 is gradually screwed into the inner side of the rotating groove 5, the conical column 13 is inserted into the rotating groove 5, thereby fixing the mother screw 1 and the sub-screw 2, thereby enhancing overall stability of the device.

[0044] As Figure 2 and Figure 9 As shown in Figure 9 , cutting threads 20 are arranged inside the limiting groove 4. The cutting threads 20 are attached to an outer wall of the guide pin 3 on the inner side, and an initial length of the spherical rod 10 is larger than a width of the cutting threads 20.

[0045] When the doctor screws the mother screw 1 and the sub-screw 2 along the guide pin 3 into the inside of the bone, under the action of the cutting threads 20, the bone stuck inside the limiting groove 4 can be cut, thereby reducing resistance received by the doctor when screwing the mother screw 1 and the sub-screw 2, and at the same time, enabling the mother screw 1 and the sub-screw 2 to enter the bone more smoothly and fit better with the bone, thereby achieving a more stable fixing effect.

[0046] As Figures 2 to 7As shown, the suction mechanism is arranged inside the limiting groove 4 and is used to suck impurities inside the limiting groove 4. The suction mechanism includes multiple groups of first sliding grooves 6 opened inside the limiting groove 4 and communicating with the second sliding groove 15. A piston ring 9 is slidably connected inside the first sliding groove 6, and one end of the piston ring 9 is fixedly connected to the spherical rod 10. A compression spring 12 is installed between the piston ring 9 and the inner side of the first sliding groove 6. The suction mechanism includes multiple groups of first connection grooves 8 opened inside the limiting groove 4 and communicating with the first sliding groove 6. An exhaust groove 7 is opened inside the female screw 1, and the exhaust groove 7 communicates with the first connection groove 8. An exhaust valve 14 is installed at one end of the exhaust groove 7; an air suction groove 17 is opened inside the female screw 1. Multiple third connection grooves 19 are opened inside the air suction groove 17, and each of the third connection grooves 19 communicates with one of the second sliding grooves 15. Multiple annularly distributed circular grooves 11 are opened inside the female screw 1. A second connection groove 16 communicating with the air suction groove 17 is opened at the top of the circular groove 11. A circular suction groove 18 communicating with the limiting groove 4 is opened at the bottom of the circular groove 11, and the notch of the circular suction groove 18 is obliquely arranged towards the cutting thread 20.

[0047] When the guide needle 3 pushes the spherical rod 10 into the second sliding groove 15, it simultaneously drives the piston ring 9 to move towards the first connection groove 8, thereby forming a negative pressure state inside the second sliding groove 15. This can generate suction on the third connection groove 19, and at the same time, the bone chips generated by cutting inside the limiting groove 4 can be sucked into the circular groove 11 through the circular suction groove 18. This ensures the cleanliness of the space inside the limiting groove 4, and at the same time, the bone chips inside the limiting groove 4 will not fall into the bone, affecting the recovery of the bone, reducing the risk of patient infection, and thus enhancing the overall practicality of the device.

[0048] The exhaust valve 14 can be a diaphragm type one-way valve. Air can flow out from the exhaust groove 7 through the exhaust valve 14. When air flows into the exhaust groove 7 from the outside, it will be blocked by the exhaust valve 14. When the piston ring 9 moves towards the first connection groove 8, it will increase the pressure inside the exhaust groove 7. At this time, the air inside the exhaust groove 7 can flow out through the exhaust valve 14, making the pressure inside the exhaust groove 7 return to normal atmospheric pressure. Thus, the inside of the exhaust groove 7 will not form pressure on the end of the piston ring 9, enhancing the overall stability of the device. At the same time, the setting of the exhaust valve 14 prevents external gas from entering the inside of the limiting groove 4, ensuring the overall airtightness of the device and thus enhancing the overall practicality of the device.

[0049] The working process of the technical solution of the present invention is as follows:

[0050] First, the doctor needs to insert the guiding needle 3 into the corresponding positions at both ends of the broken bone in the human body with the cooperation of imaging technology. After inserting the guiding needle 3 into the inner sides of both ends of the broken bone, then the doctor screws the mother screw 1 and the son screw 2 into the bone successively along the outer wall direction of the guiding needle 3. During the process of screwing the mother screw 1 and the son screw 2 into the bone, the guiding needle 3 can calibrate and guide the mother screw 1 and the son screw 2, so that the doctor does not have to continuously calibrate the positions of the mother screw 1 and the son screw 2 by observing the position of the guiding needle 3 through imaging technology, thereby reducing the operation difficulty of the doctor. At the same time, due to the guiding effect of the guiding needle 3, the positioning accuracy of the mother screw 1 and the son screw 2 is enhanced, thus improving the overall practicability of the device.

[0051] During the process of screwing the mother screw 1 and the son screw 2 into the inner side of the bone, when the spherical surface at the end of the spherical rod 10 contacts the guiding needle 3, the spherical rod 10 is subjected to resistance and contracts towards the inside of the second sliding groove 15. At the same time, under the action of the compression spring 12, the spherical rod 10 can always abut against the outer wall of the guiding needle 3, thereby playing a guiding role in screwing the mother screw 1 and the son screw 2 into the bone, enhancing the accuracy of insertion of the mother screw 1 and the son screw 2. At the same time, after the mother screw 1 and the son screw 2 are screwed into the inner side of the bone, under the action of the spherical rod 10, the structural strength between the mother screw 1 and the son screw 2 and the guiding needle 3 is enhanced, thereby improving the overall stability of the device.

[0052] After the doctor screws the mother screw 1 into the bone along the outer wall of the guiding needle 3, the son screw 2 can rotate a certain angle along the rotating groove 5, so that the doctor can rotate different angles according to different patients, thereby improving the applicability of the device. At the same time, after the doctor adjusts the angle, the son screw 2 is screwed into the corresponding broken bone along the other guiding needle 3. During this process, when the tapered column 13 is gradually screwed into the inside of the rotating groove 5, the tapered column 13 is inserted into the inside of the rotating groove 5, thereby fixing the mother screw 1 and the son screw 2, enhancing the overall stability of the device.

[0053] When the doctor screws the mother screw 1 and the son screw 2 along the guide pin 3 into the inner side of the bone, under the action of the cutting thread 20, the bone stuck inside the limiting groove 4 can be cut, thereby reducing the resistance suffered by the doctor when screwing the mother screw 1 and the son screw 2, and at the same time making the mother screw 1 and the son screw 2 enter the bone more smoothly and fit better with the bone, thus achieving a more stable fixing effect.

[0054] When the doctor screws the mother screw 1 and the son screw 2 along the guide pin 3 into the inner side of the bone, under the action of the cutting thread 20, the bone stuck inside the limiting groove 4 can be cut, thereby reducing the resistance suffered by the doctor when screwing the mother screw 1 and the son screw 2, and at the same time making the mother screw 1 and the son screw 2 enter the bone more smoothly and fit better with the bone, thus achieving a more stable fixing effect.

[0055] When the guide pin 3 pushes the spherical rod 10 into the second sliding groove 15, it simultaneously drives the piston ring 9 to move towards the first connecting groove 8, thereby forming a negative pressure state inside the second sliding groove 15, which can generate suction on the third connecting groove 19. At the same time, the bone chips generated by cutting inside the limiting groove 4 can be sucked into the inner side of the circular groove 11 through the circular suction groove 18, thereby ensuring the cleanliness of the space inside the limiting groove 4, and at the same time preventing the bone chips inside the limiting groove 4 from falling into the bone and affecting the recovery of the bone, reducing the risk of patient infection, and thus enhancing the overall practicality of the device.

[0056] The present invention covers any substitutions, modifications, equivalent methods, and solutions made within the essence and scope of the present invention. To enable the public to have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention. However, those skilled in the art can fully understand the present invention without these detailed descriptions. In addition, well-known methods, processes, procedures, components, and circuits are not described in detail to avoid unnecessary confusion to the essence of the present invention.

[0057] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An articulated bidirectional intramedullary fixation device, characterized in that: include: A mother screw and a sub-screw installed inside the mother screw; Guide pins, two of which are provided and are respectively arranged on the inner sides of the mother screw and the sub-screw; Auxiliary guide mechanism, two of which are provided, and the two auxiliary guide mechanisms are respectively provided on the inner sides of the mother screw and the sub-screw, and are used to guide the mother screw and the sub-screw during the insertion process, and the auxiliary guide mechanism includes limiting grooves respectively provided on the inner sides of the mother screw and the sub-screw, and the inner diameter of the limiting groove is greater than the diameter of the guide pin; A suction mechanism is arranged on the inner side of the limiting groove and is used for sucking impurities inside the limiting groove.

2. The articulated bidirectional intramedullary fixation device according to claim 1, characterized in that: A conical column is fixedly connected to one side of the sub-screw, and one end of the conical column is set to be conical. A rotation groove is opened on the inner side of the mother screw, and the inner diameter of the rotation groove is larger than the conical bottom diameter of the conical column and smaller than the conical top diameter of the conical column.

3. The articulated bidirectional intramedullary fixation device according to claim 2, characterized in that: The auxiliary guiding mechanism includes a plurality of groups of second sliding grooves opened on the inner side of the limiting groove, each group of the second sliding grooves is provided with four, the four second sliding grooves are distributed in an annular manner on the inner side of the limiting groove, and a spherical rod is slidably connected to the inner side of each second sliding groove.

4. The articulated bidirectional intramedullary fixation device according to claim 3, characterized in that: One end of the spherical rod is configured as a spherical surface, and the spherical surface protrudes from the inner side of the female screw.

5. The articulated bidirectional intramedullary fixation device according to claim 4, characterized in that: A cutting thread is arranged on the inner side of the limiting groove, the inner side of the cutting thread is fitted on the outer wall of the guide pin, and the initial length of the spherical rod is greater than the width of the cutting thread.

6. The articulated bidirectional intramedullary fixation device according to claim 5, characterized in that: The suction mechanism includes a plurality of first sliding grooves opened on the inner side of the limiting groove and communicating with the second sliding groove, a piston ring is slidably connected to the inner side of the first sliding groove, and one end of the piston ring is fixedly connected to the spherical rod, and a compression spring is installed between the piston ring and the inner side of the first sliding groove.

7. The articulated bidirectional intramedullary fixation device according to claim 6, characterized in that: The suction mechanism includes a plurality of first connection grooves which are opened inside the limiting groove and communicate with the first sliding groove, and an exhaust groove is opened inside the female screw.

8. The articulated bidirectional intramedullary fixation device according to claim 7, characterized in that: The exhaust groove is communicated with the first connecting groove, and an exhaust valve is installed at one end of the exhaust groove.

9. The articulated bidirectional intramedullary fixation device according to claim 7, characterized in that: An air suction groove is provided on the inner side of the female screw, a plurality of third connecting grooves are provided on the inner side of the air suction groove, and each of the third connecting grooves is communicated with one of the second sliding grooves, and a plurality of circular grooves distributed in an annular manner are provided on the inner side of the female screw.

10. The articulated bidirectional intramedullary fixation device according to claim 9, characterized in that: A second connecting groove communicating with the air suction groove is formed at the top of the circular groove, a circular suction groove communicating with the limiting groove is formed at the bottom of the circular groove, and a notch of the circular suction groove is obliquely arranged toward the cutting thread.

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