Pedicle screw breakage negative pressure extractor

Abstract

The present disclosure relates to the technical field of medical devices, and provides a pedicle screw broken screw negative pressure extractor for extracting a broken screw from a pedicle of a lumbar vertebra, comprising a barrel body, the barrel body being arranged to slide in the pedicle, the barrel body having a sliding cavity opened along a length direction and having an opening facing away from the broken screw; a piston rod being arranged to slide in the sliding cavity, the piston rod being arranged to form a negative pressure space together with a side wall and a bottom wall of the sliding cavity after sliding away from the bottom wall of the sliding cavity; a suction disc being arranged at an end of the barrel body close to the broken screw, the suction disc having a suction space at an end of the suction disc away from the barrel body, the suction space being in communication with the negative pressure space; the suction disc being arranged to abut against an end surface of the broken screw after the barrel body slides in the pedicle to be close to the end surface of the broken screw, so that the suction space can suck the broken screw. Through the above technical solution, the technical problem that the broken screw of the pedicle screw is difficult to be extracted from the lumbar vertebra in the prior art is solved.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of medical device technology, and more specifically, to a negative pressure extraction device for broken pedicle screws. Background Technology

[0002] In spinal surgery, pedicle screw fixation is a crucial method for treating lumbar spine diseases and is widely used. However, pedicle screw breakage is a frequent problem in clinical practice, seriously affecting surgical outcomes and patient prognosis.

[0003] The causes of screw breakage are varied. From the perspective of the screw itself, some screw materials have poor fatigue resistance under long-term complex mechanical environments within the body, making them prone to metal fatigue and subsequent fracture. During surgical procedures, if the screw is inserted at an incorrect angle or depth, it will be subjected to abnormal stress, increasing the risk of breakage. In addition, premature weight-bearing by the patient after surgery or improper rehabilitation activities can also place excessive load on the screw, promoting breakage.

[0004] When a broken screw occurs, the complex anatomy of the lumbar vertebrae, the confined space around the broken screw, and its proximity to important nerves and blood vessels make it difficult for traditional mechanical clamping tools to accurately grasp the screw within this limited space. Even slight mishaps can damage surrounding tissues. This not only prolongs the operation time but also increases the risk of intraoperative and postoperative complications, causing significant suffering for the patient. Utility Model Content

[0005] To overcome the above-mentioned defects, the embodiments of this disclosure provide a negative pressure extractor for broken pedicle screws, which solves the technical problem in the prior art that broken pedicle screws are difficult to remove from the lumbar vertebrae.

[0006] According to one aspect, at least one embodiment of this disclosure provides a negative pressure extraction device for pedicle screws to remove broken screws from the screw track in the lumbar vertebra, comprising:

[0007] A cylindrical body, which is slidably disposed in the nail track, has a sliding cavity that is opened along the length direction and the opening is opposite to the broken nail;

[0008] A piston rod is slidably disposed within the sliding cavity. After the piston rod is arranged to slide away from the bottom wall of the sliding cavity, the end face of the piston rod, together with the side wall and bottom wall of the sliding cavity, forms a negative pressure space.

[0009] A suction cup is disposed at the end of the cylinder near the broken nail, and the end of the suction cup away from the cylinder has an adsorption space communicating with the negative pressure space; the suction cup is arranged such that when the cylinder slides close to the end face of the broken nail in the nail channel, the suction cup abuts against the end face of the broken nail, so that the adsorption space adsorbs the broken nail.

[0010] For example, in a pedicle screw broken negative pressure removal device provided in at least one embodiment of this disclosure, the end of the cylinder away from the suction cup has a first gripping part for pressing and holding.

[0011] For example, in a pedicle screw broken negative pressure removal device provided in at least one embodiment of this disclosure, the piston rod has a plurality of ratchet teeth evenly spaced along the length direction, and the end face of the first gripping part is provided with a mounting groove communicating with the sliding cavity. A pawl for engaging with the ratchet teeth is rotatably connected in the mounting groove. The ratchet teeth and the pawl are arranged such that after the piston rod slides away from the bottom wall of the sliding cavity, they are used to restrict the reverse sliding of the piston rod.

[0012] For example, in at least one embodiment of this disclosure, a pedicle screw broken screw negative pressure extraction device is provided, which further includes an elastic element. The two ends of the elastic element act on the pawl and the bottom wall of the mounting groove, respectively. The elastic element is used to elastically pull the pawl so that the pawl rotates closer to the bottom wall of the mounting groove.

[0013] For example, in a pedicle screw broken screw negative pressure extractor provided in at least one embodiment of this disclosure, the pawl sidewall has an abutment protrusion for abutting against the bottom wall of the mounting groove.

[0014] For example, in at least one embodiment of the present disclosure, a pedicle screw broken negative pressure extractor is provided, which further includes a rotating handle. One end of the rotating handle passes through the first grip portion and is connected to the side wall of the pawl. The rotating handle is arranged to rotate so that the end of the pawl that is close to the ratchet tooth gradually moves away from the ratchet tooth, thereby releasing the engagement between the pawl and the ratchet tooth.

[0015] For example, in a pedicle screw broken negative pressure removal device provided in at least one embodiment of this disclosure, the piston rod has a vent hole opened along the length direction, the vent hole is used to connect the negative pressure space and the negative pressure suction device; a sealing cap is threaded to the end of the piston rod away from the suction cup, and the sealing cap is used to open or close the vent hole after rotation.

[0016] For example, in a pedicle screw negative pressure extraction device provided in at least one embodiment of this disclosure, the cylindrical body has a ball head protrusion near the end of the broken screw; the suction cup has a spherical groove near the end of the cylindrical body, and the suction cup is hinged to the end of the cylindrical body through a ball joint formed by the ball head protrusion and the spherical groove.

[0017] For example, in a pedicle screw broken negative pressure removal device provided in at least one embodiment of this disclosure, the sidewall of the first gripping part has anti-slip texture.

[0018] For example, in a pedicle screw broken negative pressure removal device provided in at least one embodiment of this disclosure, the piston rod has a second gripping part at the end away from the suction cup for pulling to drive the piston rod to slide.

[0019] The beneficial effects of the embodiments disclosed herein are as follows:

[0020] This invention addresses the challenge of removing broken lumbar vertebral screws by utilizing the principle of negative pressure adsorption. Through a structural design of a cylinder, piston rod, and suction cup, it successfully solves the problem of traditional tools struggling to grasp broken screws in complex and confined spaces. The design is simple and rational; during operation, the surgeon only needs to sequentially complete the steps of inserting the cylinder, adsorbing the broken screw with the suction cup, sliding the piston rod to create negative pressure, and rotating the entire assembly for removal. The operation process is clear, easy to master, and significantly shortens the surgical time, reducing patient discomfort during the procedure. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a pedicle screw negative pressure removal device in use according to one embodiment of the present disclosure;

[0023] Figure 2 for Figure 1 A schematic diagram of the internal structure of the lumbar spine during the use of a pedicle screw negative pressure removal device in an embodiment;

[0024] Figure 3 for Figure 1 A schematic diagram of the structure of a pedicle screw fracture negative pressure removal device in one embodiment;

[0025] Figure 4 for Figure 1 A schematic diagram of the internal structure of a pedicle screw fracture negative pressure removal device in one embodiment;

[0026] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0027] Figure 6 for Figure 4 Enlarged view of section B in the middle.

[0028] In the diagram: 1. Lumbar vertebra, 11. Screw track, 2. Broken screw, 3. Cylinder, 31. Sliding cavity, 4. Piston rod, 41. Negative pressure space, 5. Suction cup, 51. Adsorption space, 32. First grip, 42. Ratchet, 321. Mounting groove, 6. Pawl, 7. Elastic element, 61. Abutting protrusion, 8. Rotating handle, 43. Vent hole, 9. Sealing cap, 33. Ball head protrusion, 52. Spherical groove, 322. Anti-slip texture, 44. Second grip. Detailed Implementation

[0029] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0030] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0031] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0032] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0034] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] like Figures 1-2 The image shows a negative pressure extractor for broken pedicle screws according to one embodiment of this disclosure. This negative pressure extractor is used when dealing with broken pedicle screws. The extractor mainly consists of three parts: a cylinder 3, a piston rod 4, and a suction cup 5.

[0036] The cylindrical body 3 is elongated to fit the nail track 11 of the lumbar vertebra 1 and slide smoothly within it. A sliding cavity 31 is formed along the length of the cylindrical body 3, with the opening of the sliding cavity 31 facing away from the direction of the broken nail 2. A piston rod 4 is installed inside the sliding cavity 31 and can slide within it. When the piston rod 4 slides away from the bottom wall of the sliding cavity 31, the end face of the piston rod 4, together with the side wall and bottom wall of the sliding cavity 31, encloses a relatively closed space, which is the negative pressure space 41. The piston rod 4 must not only be able to slide but also ensure good sealing of the negative pressure space 41 after it is formed, preventing air leakage from affecting the negative pressure effect.

[0037] The suction cup 5 is located at the end of the cylinder 3 near the broken nail 2. The end of the suction cup 5 away from the cylinder 3 has an adsorption space 51, which is connected to the negative pressure space 41 mentioned earlier. When the cylinder 3 slides closer to the end face of the broken nail 2 within the nail track 11 until the suction cup 5 comes into contact with the end face of the broken nail 2, a negative pressure will be formed in the adsorption space 51 due to the presence of the negative pressure space 41, thereby firmly adsorbing the broken nail 2.

[0038] Specifically, the doctor first inserts the cylinder 3 into the nail channel 11 of the lumbar vertebra 1, ensuring that the cylinder 3 fits the nail channel 11 and can slide smoothly, gradually bringing the end of the cylinder 3 near the broken nail 2 closer to it. The suction cup 5 is then brought into tight contact with the end face of the broken nail 2. The piston rod 4 is operated, sliding within the sliding cavity 31 away from its bottom wall. As the piston rod 4 slides, a negative pressure space 41 gradually forms. Since the negative pressure space 41 is connected to the suction space 51, a negative pressure is created within the suction space 51. Using the atmospheric pressure difference, the broken nail 2 is adsorbed onto the suction cup 5. After confirming that the broken nail 2 is firmly adsorbed, the doctor slowly rotates the extractor, thus successfully removing the broken nail 2 from the nail channel 11 of the lumbar vertebra 1.

[0039] The advantage lies in the fact that this extraction device addresses the challenge of retrieving a broken nail 2 from a lumbar vertebra 1. Utilizing the principle of negative pressure adsorption, and through the structural design of the cylinder 3, piston rod 4, and suction cup 5, it successfully solves the problem of traditional tools struggling to grasp the broken nail 2 in complex and confined spaces. Its structural design is simple and reasonable. During operation, the doctor only needs to complete the steps of inserting the cylinder 3, adsorbing the broken nail 2 with the suction cup 5, sliding the piston rod 4 to create negative pressure, and rotating the entire device for extraction. The operation process is clear, easy to master, and significantly shortens the operation time, reducing patient discomfort during the procedure.

[0040] like Figures 4-5 As shown, the end of the cylinder 3 furthest from the suction cup 5 is designed with a first gripping part 32. The first gripping part 32 is generally flat, its width is greater than the diameter of the cylinder 3, and its two ends are smoothly transitioned, so that the doctor's fingers can naturally fit on the first gripping part 32 during operation.

[0041] Specifically, during the removal of the broken nail 2, the doctor places their fingers on the surface of the first gripping part 32, and firmly grasps it using the coordination of the thumb and the other four fingers. Then, using the strength of their hand, the doctor pushes the cylinder 3 to slide within the nail track 11, bringing it closer to the broken nail 2. During the operation, the first gripping part 32 provides the doctor with a point of leverage, making it easier for the doctor to control the direction and force of movement of the cylinder 3.

[0042] The advantage is that the design of the first grip 32 improves the ease of operation and stability, allowing doctors to control the extractor more freely, thereby increasing the success rate of the broken nail 2 removal surgery and reducing operation time and patient suffering.

[0043] like Figures 4-5 As shown, the piston rod 4 has a number of ratchet teeth 42 evenly spaced, these ratchet teeth 42 are triangular, and the tips of the teeth face the suction cup 5. The end face of the first gripping part 32 has a mounting groove 321 that communicates with the sliding cavity 31. The mounting groove 321 is a rectangular groove. Inside the mounting groove 321, a pawl 6 is vertically rotatably connected by a horizontal pivot. The shape of the pawl 6 is adapted to the ratchet teeth 42, and it can achieve a tight engagement with the ratchet teeth 42.

[0044] Specifically, when the doctor pulls the piston rod 4 away from the bottom wall of the sliding cavity 31, the ratchet 42 moves along with the piston rod 4. Due to the design of the ratchet 42's tooth tips, the pawl 6 will slide and engage with the ratchet 42, that is, the pawl 6 will pass over the ratchet 42 one by one. When the piston rod 4 stops being pulled, the pawl 6 will be locked between the ratchet 42, preventing the piston rod 4 from sliding in the opposite direction, thereby maintaining the stability of the negative pressure space 41 and ensuring the suction force of the suction cup 5 on the broken nail 2.

[0045] The advantage is that the design of the ratchet 42 and the pawl 6 effectively prevents the piston rod 4 from sliding in the opposite direction, enhances the stability of the negative pressure adsorption, and ensures that the broken nail 2 does not fall off during the removal process.

[0046] like Figures 4-5 As shown, an elastic element 7 has been added. The elastic element 7 is a helical spring, one end of which is fixed to the middle of the pawl 6, and the other end is fixed to the bottom wall of the mounting groove 321. When the elastic element 7 is in its natural state, it will exert a downward pulling force on the pawl 6, causing the pawl 6 to rotate and move closer to the bottom wall of the mounting groove 321.

[0047] Specifically, during the pulling of the piston rod 4, the pawl 6 rises upwards along with the movement of the ratchet 42. At this time, the elastic element 7 is stretched, storing elastic potential energy. When the pawl 6 passes a ratchet 42, the elastic potential energy of the elastic element 7 is released, pulling the pawl 6 downwards so that it tightly engages with the next ratchet 42. Throughout the entire process, the elastic element 7 provides a stable pulling force to the pawl 6, ensuring reliable engagement between the pawl 6 and the ratchet 42.

[0048] The advantage is that the addition of the elastic element 7 further improves the stability of the engagement between the pawl 6 and the ratchet 42, ensuring the stability of the negative pressure space 41, thereby improving the safety and reliability of removing the broken nail 2.

[0049] like Figures 4-5 As shown, the side wall of the pawl 6 is designed with an abutment protrusion 61, which is a semi-circular block structure. When the pawl 6 rotates and approaches the bottom wall of the mounting groove 321, the abutment protrusion 61 will abut against the bottom wall of the mounting groove 321.

[0050] Specifically, under the action of the elastic element 7, the pawl 6 rotates towards the bottom wall of the mounting groove 321. When the abutment protrusion 61 contacts the bottom wall of the mounting groove 321, the pawl 6 stops rotating. At this time, the abutment protrusion 61 restricts the excessive rotation of the pawl 6, ensuring that a fixed engagement depth is maintained between the pawl 6 and the ratchet 42.

[0051] The advantage is that the design of the abutment protrusion 61 improves the engagement accuracy of the pawl 6 and the ratchet 42, enhances the positioning stability of the piston rod 4, further improves the effect of negative pressure adsorption, and facilitates the smooth removal of the broken nail 2.

[0052] like Figures 3-5 As shown, a rotating handle 8 has been added. The rotating handle 8 is a rod-shaped structure, with one end penetrating through the side wall of the first gripping part 32 and fixedly connected to the side wall of the pawl 6. A long strip-shaped grip knob is designed at one end of the rotating handle 8 outside the first gripping part 32 for easy operation by the doctor.

[0053] Specifically, when it is necessary to disengage the pawl 6 from the ratchet 42, the doctor holds the knob of the rotating handle 8 and rotates the handle 8 away from the ratchet 42. Rotating the handle 8 causes the pawl 6 to rotate around the axis, gradually moving the end of the pawl 6 closest to the ratchet 42 away from the ratchet 42 until it is completely disengaged. At this time, the piston rod 4 can slide freely in the opposite direction, facilitating the repositioning or adjustment of the extractor.

[0054] The advantage is that the design of the rotating handle 8 allows the doctor to control the engagement state of the pawl 6 and the ratchet 42, which improves the operational flexibility and repeatability of the extractor and reduces the operation time and difficulty during the operation.

[0055] like Figures 3-6 As shown, a vent hole 43 is provided along the length of the piston rod 4. The vent hole 43 is a cylindrical through hole, and its axis can coincide with the axis of the piston rod 4. One end of the vent hole 43 is connected to the negative pressure space 41, and the other end extends to the end of the piston rod 4 away from the suction cup 5, and is provided with a standard medical negative pressure interface. This interface is a Luer lock connector structure, which can be quickly connected to the air supply tube of the electric negative pressure device. At the end of the piston rod 4 away from the suction cup 5, a sealing cap 9 is connected by threads. The outer surface of the sealing cap 9 is designed with anti-slip texture, and the inner surface of the sealing cap 9 is provided with an annular sealing ring. When the sealing cap 9 is tightened, the sealing ring fits tightly with the medical interface at the end of the piston rod 4 to form an airtight seal.

[0056] Specifically, during negative pressure adsorption, the sealing cap 9 is tightened, and the annular sealing ring fits tightly with the medical interface at the end of the piston rod 4, sealing the vent 43 and ensuring the airtightness of the negative pressure space 41. The doctor holds the second gripping part 44 of the piston rod 4 and pulls the piston rod 4 away from the bottom wall of the sliding cavity 31, increasing the volume of the sliding cavity 31 and creating negative pressure inside. This negative pressure is transmitted to the adsorption space 51 through the guide channel, causing the broken nail 2 to be adsorbed and fixed in the concave surface of the suction cup 5.

[0057] When the piston rod 4 slides to the limit position of the sliding cavity 31, that is, when the end face of the piston rod 4 reaches the maximum distance with the bottom wall of the sliding cavity 31, if the initial negative pressure of the negative pressure space 41 still cannot effectively adsorb the broken nail 2, the doctor stops manually pulling the piston rod 4. Next, the doctor loosens the sealing cap 9 and removes it completely, and connects the air supply tube of the electric negative pressure device to the medical interface of the vent 43 through the Luer lock connector. The electric negative pressure device is activated, and air is continuously drawn into the negative pressure space 41 through the vent 43 to further reduce the air pressure in the space, so that the negative pressure of the adsorption space 51 is significantly increased, ensuring that the broken nail 2 is firmly adsorbed.

[0058] When it is necessary to release the negative pressure, if it is in manual negative pressure mode, the doctor turns the sealing cover 9 counterclockwise to separate it from the piston rod 4, the vent 43 opens, outside air enters the negative pressure space 41, the negative pressure disappears, and the broken nail 2 can be removed from the suction cup 5; if it is in electric negative pressure mode, first turn off the electric negative pressure device, then disconnect the air supply tube from the vent 43 interface, and then operate in the same way as the manual negative pressure release method.

[0059] The advantages lie in the design of the vent 43, sealing cap 9, and standard medical negative pressure interface, which greatly enhances the operational flexibility and safety of the extractor. It allows doctors to handle various complex broken nail scenarios. For broken nails 2 that cannot be adsorbed by conventional negative pressure, such as tiny broken nails 2 or broken nails with uneven surfaces 2, the success rate of adsorption can be significantly improved by using external electric negative pressure. At the same time, it overcomes the stroke limitation of the piston rod 4, extending the instrument's applicable range and making the extractor suitable for deeper and more complex nail tract 11 environments. Furthermore, it reduces surgical risks, avoids tissue damage caused by repeated manual adsorption attempts, and reduces the time cost of temporarily changing instruments during surgery.

[0060] like Figure 6 As shown, the end of the cylinder 3 near the broken nail 2 is designed with a ball-shaped protrusion 33, which is spherical. The suction cup 5 near the end of the cylinder 3 has a spherical groove 52, the radius of which matches the radius of the ball-shaped protrusion 33. The suction cup 5 is hinged to one end of the cylinder 3 via a ball joint formed by the ball-shaped protrusion 33 and the spherical groove 52.

[0061] Specifically, when the cylinder 3 slides close to the broken nail 2 within the nail track 11, the suction cup 5 can rotate freely within a certain range via a ball joint because the angle of the end face of the broken nail 2 may be irregular. When the suction cup 5 contacts the end face of the broken nail 2, it will automatically adjust its angle to ensure that the adsorption surface is completely in contact with the end face of the broken nail 2, thereby forming a good seal and ensuring the adsorption effect.

[0062] The advantage is that the ball joint design allows the extractor to adapt to broken screws 2 at different angles, expanding its applicability, improving the success rate of the operation, and reducing operational difficulties caused by the angle of the broken screws 2.

[0063] like Figure 3 As shown, the side wall of the first grip part 32 is designed with anti-slip texture 322, which is vertical.

[0064] Specifically, when the doctor holds the first gripping part 32, their fingers come into contact with the anti-slip texture 322. The anti-slip texture 322 increases the friction between the fingers and the first gripping part 32, allowing the doctor to grip the first gripping part 32 more firmly during the operation and making it less likely to slip.

[0065] The advantage is that the anti-slip texture 322 design improves the stability of the doctor's grip on the first grip part 32, reduces the possibility of operational errors, and improves the safety and success rate of the surgery.

[0066] like Figures 3-6 As shown, the piston rod 4 has a second gripping part 44 at the end away from the suction cup 5. The second gripping part 44 is a long strip or a disc-shaped structure, and its diameter is larger than the diameter of the piston rod 4. The surface of the second gripping part 44 is designed to be a rough frosted surface.

[0067] Specifically, when the doctor pulls the piston rod 4, he places his fingers on the frosted surface of the second grip 44 and pulls the second grip 44 with the force of his hand, causing the piston rod 4 to slide within the sliding cavity 31. The frosted surface increases the friction between the fingers and the second grip 44, allowing the doctor to pull the piston rod 4 more easily and stably.

[0068] The advantage is that the design of the second gripping part 44 provides the doctor with a convenient point of force for pulling, which improves the convenience and stability of the operation of the piston rod 4, and helps to accurately form negative pressure, thereby improving the success rate of removing the broken nail 2.

[0069] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A pedicle screw breakage negative pressure extractor for extracting a broken pedicle screw (2) from a screw channel (11) of a lumbar vertebra (1), characterized in that, The utility model relates to a kind of negative pressure extractor for pedicle screw broken nail, including: Cylinder (3), the cylinder (3) is slidably arranged in the nail channel (11), the cylinder (3) has sliding cavity (31) being opened along length direction and opening away from the broken nail (2); Piston rod (4), the piston rod (4) is slidably arranged in the sliding cavity (31), the piston rod (4) is arranged as sliding away from the bottom wall of the sliding cavity (31) after, the piston rod (4) end surface and the side wall and bottom wall of the sliding cavity (31) jointly form negative pressure space (41); Suction disc (5), the suction disc (5) is arranged in the cylinder (3) close to the broken nail (2) one end, the suction disc (5) away from the cylinder (3) one end has with the negative pressure space (41) intercommunication suction space (51);The suction disc (5) is arranged as when the cylinder (3) is slid in the nail channel (11) close to the broken nail (2) end surface after, the suction disc (5) and the broken nail (2) end surface abut, to make the suction space (51) adsorb the broken nail (2).

2. The pedicle screw breakage negative pressure extractor according to claim 1, wherein, The cylinder (3) away from the suction disc (5) one end has first holding portion (32) for pressing and holding.

3. A broken pedicle screw negative pressure extractor according to claim 2, wherein, The piston rod (4) is uniformly spaced on the piston rod (4) and is provided with a plurality of ratchet teeth (42) along the length direction, the first holding portion (32) end face is provided with installation groove (321) being communicated with the sliding cavity (31), the installation groove (321) is rotatably connected with the ratchet pawl (6) for engaging with the ratchet teeth (42), the ratchet teeth (42) and the ratchet pawl (6) are arranged as the piston rod (4) slides away from the bottom wall of the sliding cavity (31) after, for limiting the reverse sliding of the piston rod (4).

4. The pedicle screw breakage negative pressure extractor according to claim 3, wherein, The utility model further comprises a resilient member (7), the resilient member (7) is arranged at both ends of the ratchet pawl (6) and the bottom wall of the installation groove (321) respectively, and the resilient member (7) is used for elastically pulling the ratchet pawl (6) to make the ratchet pawl (6) rotate close to the bottom wall of the installation groove (321).

5. The pedicle screw breakage negative pressure extractor according to claim 3, wherein, The side wall of the ratchet pawl (6) is provided with an abutting protrusion (61) for abutting against the bottom wall of the installation groove (321).

6. The pedicle screw breakage negative pressure extractor of claim 3, wherein, The utility model further comprises a rotating handle (8), one end of the rotating handle (8) penetrates the first holding portion (32) and is connected with the side wall of the ratchet pawl (6), and the rotating handle (8) is arranged to rotate to drive the ratchet pawl (6) to gradually move away from the ratchet teeth (42) at one end of the ratchet teeth (42), so as to release the engagement between the ratchet pawl (6) and the ratchet teeth (42).

7. The pedicle screw breakage negative pressure extractor of claim 1, wherein, The piston rod (4) is provided with an air vent (43) along the length direction, the air vent (43) is used for communicating the negative pressure space (41) and negative pressure air extraction device, and the piston rod (4) is threadedly connected with a sealing cover (9) away from the suction disc (5) one end, and the sealing cover (9) is used for opening or closing the air vent (43) after rotating.

8. The pedicle screw breakage negative pressure extractor of claim 1, wherein, The barrel (3) has a ball head protrusion (33) near one end of the nail (2); the suction cup (5) has a spherical groove (52) near one end of the barrel (3), and the suction cup (5) is hinged to one end of the barrel (3) through the spherical hinge pair formed by the ball head protrusion (33) and the spherical groove (52).

9. The pedicle screw breakage negative pressure extractor of claim 2, wherein, The sidewall of the first holding part (32) has an anti-skid pattern (322).

10. The pedicle screw breakage negative pressure extractor of claim 9, wherein, The piston rod (4) has a second holding part (44) at one end away from the suction cup (5) for pulling to drive the piston rod (4) to slide.

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