Bone cement injection device for skull repair

Abstract

The invention relates to a bone cement injection device for skull repair. The bone cement injection device comprises an outer sheath tube, a separate injection structure and an outer push rod, a pushing channel extending in the axial direction is formed in the outer sheath tube, the tube wall of the outer sheath tube is provided with a first hole group and a second hole group which are symmetrically distributed by 180 degrees in the circumferential direction, and each hole group comprises a plurality of via holes arranged at equal intervals in the axial direction; the two symmetrically-arranged separated injection structures are arranged corresponding to the first hole set and the second hole set respectively, each separated injection structure comprises a separated injection pipe, the separated injection pipe is inserted into the pushing channel, a perfusion channel extending in the axial direction is arranged in the separated injection pipe, the near end of the perfusion channel is through, and the far end of the perfusion channel is closed; the rigid contact pins are arranged at equal intervals in the axial direction of the separate injection pipe and penetrate through the side wall of the separate injection pipe at the same circumferential angle, and the inner end of each contact pin is communicated with the perfusion channel. The repairing block can be effectively filled with bone cement, and the effect after skull repairing is improved.

Description

Technical Field

[0001] The invention belongs to the field of medical technology, and in particular relates to a bone cement injection device for skull repair. Background Art

[0002] The applicant applied for on July 31, 2024, with publication number: CN118557338A, and named "A Skull Repair Component", which discloses a repair block woven with nickel-titanium alloy wire. When repairing the patient's skull, the repair block is implanted into the bone window, and then bone cement is injected and hardened to replace the missing skull, thereby achieving the purpose of skull repair.

[0003] However, in actual application, the inventor found that after the repair block is implanted into the bone window, a longer needle is required to be inserted into the repair block from the incision when injecting bone cement into the repair block. The repair block is woven from nickel-titanium alloy wire, and the needle cannot move laterally in the repair block. This requires frequent pulling out and inserting of the needle to fill the bone cement. Moreover, when filling the bone cement, medical staff cannot directly observe the injection of the bone cement, and often the local repair block is not filled with bone cement, resulting in unsatisfactory surgical results. Summary of the Invention

[0004] In view of this, the present invention provides a bone cement injection device for skull repair, which can effectively fill the interior of the repair block with bone cement and improve the effect of skull repair.

[0005] The technical solution adopted in the present invention is: A bone cement injection device for skull repair, comprising an outer sheath, an injection structure and an outer push rod; An outer sheath tube having an axially extending push channel formed therein, wherein the outer sheath tube wall is provided with a first hole group and a second hole group symmetrically distributed along a 180° circumferential direction, each hole group comprising a plurality of through holes arranged at equal intervals along the axial direction; Two symmetrically arranged dispensing structures are respectively arranged corresponding to the first hole group and the second hole group, and each dispensing structure includes: A dispensing tube is inserted into the pushing channel and is provided with an axially extending perfusion channel, wherein the perfusion channel is open at the proximal end and closed at the distal end; A plurality of rigid pins are arranged at equal intervals along the axial direction of the dispensing tube and penetrate the side wall of the dispensing tube at the same circumferential angle, and the inner end of each pin is connected to the perfusion channel; The two dispensing structures are respectively a first dispensing structure and a second dispensing structure, wherein the pins on the first dispensing structure are plugged one by one with the via holes of the first hole group, and the pins on the second dispensing structure are plugged one by one with the via holes of the second hole group; An outer push rod is axially movably disposed between the two dispensing pipes; The dispensing structure has a first station and a second station relative to the outer sheath tube; First station: the outer push rod is in the proximal initial position, the two dispensing tubes are close to each other, and the tip of the insertion needle is located in the through hole and does not pass through the outer wall of the outer sheath tube; Second station: the outer push rod moves toward the distal end and wedges between the two dispensing tubes, forcing the two dispensing tubes to move radially in opposite directions, so that each pin passes through the outer wall of the outer sheath tube along the long axis direction of the corresponding through hole.

[0006] Preferably, the cross section of the outer sheath is elliptical, and the long axis direction thereof is collinear with the radial movement direction of the two dispensing structures; The cross section of the dispensing pipe is a crescent shape with a convex outer side and a concave inner side, comprising: An outer convex arc surface matching the inner wall of the outer sheath tube, wherein the outer convex arc surface is in contact with the inner wall of the elliptical pushing channel in the second working position; The radially inwardly facing concave arc surface forms an initial transition channel between the two concave arc surfaces when the two surfaces are in the first working position.

[0007] Preferably, a conical guide portion is provided at the distal end of the outer push rod. When the outer push rod moves toward the distal end, the conical guide portion wedges between the inner concave arc surfaces of the two dispensing tubes, forcing the initial transition channel to expand radially until the outer convex arc surfaces of the two dispensing tubes fit with the inner wall of the outer sheath tube.

[0008] Preferably, in the long axis direction of the outer sheath tube, the first hole group and the second hole group are arranged opposite to each other; In the longitudinal direction of the dispensing tube, the dispensing tube is divided into a first portion located distally and a second portion located proximally, with the distal end of the perfusion channel as the dividing line. The first portion is provided with a limiting hole extending through along the longitudinal direction. The limiting hole includes a large-diameter section and a small-diameter section connected to each other, and the large-diameter section is located radially outward of the small-diameter section. The limiting holes of the two dispensing pipes are radially aligned; It also includes a limiting rod, with circular limiting parts at both ends of the limiting rod; The limiting rod passes through the two limiting holes and slides with the small diameter section. At the second station, the two limiting parts are respectively inserted into the two large diameter sections to limit the relative movement direction of the two dispensing pipes.

[0009] Preferably, the length of the first portion is no greater than 5 mm.

[0010] Preferably, the second part includes a handheld portion and a pin portion connected to each other, the pin portion is located in the pushing channel, the handheld portion is located outside the pushing channel, and the pin is connected to the pin portion.

[0011] Preferably, an auxiliary limiting member is further provided in the outer sheath tube, the number of the auxiliary limiting members is consistent with the number of the through holes and corresponds one to one, the auxiliary limiting member includes an upper petal and a lower petal that are relatively spaced apart from each other, a plug-in slot is formed between the upper petal and the lower petal, the auxiliary limiting member is connected to the periphery of the corresponding through hole, the length direction of the upper petal and the lower petal are both the long axis direction of the outer sheath tube, so that the plug-in slot is connected to the through hole; At the first station, the pin passes through the insertion slot.

[0012] Preferably, when the two dispensing tubes move in opposite directions in the radial direction, the free ends of the upper petal and the lower petal contact the dispensing tube and fork up and down.

[0013] Beneficial effects of the present invention: A straight filling channel is reserved in the repair block. During the operation, a 2-3 cm incision is made on the scalp, and the repair module can be sent into the bone window. The repair module fits the bone window, and the anti-seepage membrane is downward in contact with the pseudodura mater. The entrance of the filling channel is located at the incision. The bone cement injection device is inserted into the filling channel through the entrance. At this time, the dispensing structure is in the first working position. The outer push rod is wedged between the two dispensing tubes from the back, so that the two dispensing tubes move in opposite directions. The needle passes through the through hole and pierces the side wall of the filling channel, so that the needle tip enters the interior of the repair block, and then bone cement is injected into the perfusion channel from the proximal end. The bone cement passes through the perfusion channel. The bone cement is injected into the injection channel and sprayed out from the needle tips of each pin, so that the bone cement can be injected into the repair module (the part outside the filling channel). Since there are two dispensing structures and each dispensing structure has multiple pins, bone cement can be poured into both sides of the filling channel, so that the bone cement can fill the entire repair module; after the bone cement is filled, the outer push rod is pulled out, and the two dispensing tubes are moved inward so that the dispensing cutter is switched to the first station, and then the bone cement injection device is withdrawn, and then the filling channel is filled with bone cement through the auxiliary tube. After the bone cement hardens, the entire bone window can be filled, thereby ensuring the effectiveness of skull repair and improving the surgical effect.

[0014] In the first station, the tip of the needle is completely housed in the outer sheath, and there are no protrusions on the outer surface of the device, so that it can be easily introduced into the filling channel without resistance.

[0015] The outer push rod is wedged in to drive the two dispensing tubes to expand radially. The needle passes through precisely along the long axis of the through-hole and pierces the side wall of the filling channel woven with nickel-titanium alloy wire, forming perfusion points symmetrically distributed on both sides. By simultaneously injecting bone cement on both sides, three-dimensional filling of the interior of the repair module (outside the filling channel) is achieved, significantly reducing cavity residue and ensuring that bone cement fills the entire repair module.

[0016] The repair block is made of nickel-titanium alloy wire, that is, the side walls of the filling channel are also woven from nickel-titanium alloy wire, making the repair block have a mesh structure and forming multiple pores inside the repair block. Similarly, pores are also formed on the side walls of the filling channel. When the needle punctures, the nickel-titanium alloy mesh avoids the needle through local elastic deformation, thereby reducing the puncture resistance and avoiding instrument jamming or structural damage. After the needle enters the interior of the repair block, the bone cement sprayed from the needle tip of the needle spreads from the needle tip to the surrounding areas. Due to the presence of two rows of pins, bone cement is poured into multiple points on both sides of the filling channel at the same time, so that the bone cement can fill the entire repair block as much as possible.

[0017] After the perfusion is completed, the external push rod is retracted to drive the dispensing tube to return to the first position, and the needle is completely retracted into the sheath to achieve safe withdrawal of the device.

[0018] Bone cement is added to the filling channel through the auxiliary tube, eventually forming a gapless continuous bone cement layer to ensure full area repair of the bone window. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which: Figure 1 It is a structural diagram of the repair module; Figure 2 is a schematic diagram of the structure of the outer sheath; Figure 3 It is a structural diagram of two split injection structures; Figure 4 is a cross-sectional view of the bone cement injection device at the first working position; Figure 5 is a cross-sectional view of the bone cement injection device at the second working position; Figure 6 It is a structural diagram of a single injection structure; Figure 7 It is a cross-sectional view of the injection structure; Figure 8 yes Figure 7 Enlarged view of part A; Figure 9 is a cross-sectional view of the two first parts under the first station; Figure 10 It is a schematic diagram of the coordination between the limiting rod and the limiting hole; Figure 11 This is a schematic diagram of the coordination between the limiting rod and the limiting hole at the second station; Figure 12 It is a structural diagram of the auxiliary limiter; Figure 13 It is a schematic diagram of the bifurcation of the upper and lower lobes.

[0020] In the figure: 1. Repair module; 2. Outer sheath; 4. Outer push rod; 11. Filling channel; 12. Entrance; 21. First hole group; 22. Second hole group; 23. Upper petal; 24. Lower petal; 31. First dispensing structure; 32. Second dispensing structure; 33. Dispensing tube; 34. Insertion pin; 35. Transition channel; 36. Limit rod; 331. Infusion channel; 332. Small diameter section; 333. Large diameter section; 334. Limiting hole; 361. Limiting portion. DETAILED DESCRIPTION

[0021] The present invention is described below based on the following embodiments, but the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail. In order to avoid obscuring the essence of the present invention, well-known methods, processes, procedures, and components are not described in detail.

[0022] Furthermore, persons of ordinary skill in the art will appreciate that the figures provided herein are for illustration purposes only and are not necessarily drawn to scale.

[0023] Unless the context clearly requires otherwise, throughout the specification and claims, the words "include," "comprising," and similar words should be construed in an inclusive sense rather than an exclusive or exhaustive sense; that is, in the sense of "including but not limited to."

[0024] In the description of the present invention, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0025] See also Figures 1-13 , the present invention provides a bone cement injection device for skull repair (hereinafter referred to as "bone cement injection device"), comprising an outer sheath 2, an injection structure and an outer push rod 4; The outer sheath tube 2 has an axially extending push channel formed therein. The outer sheath tube 2 has a wall provided with a first hole group 21 and a second hole group 22 symmetrically distributed along a 180° circumferential direction, and each hole group includes a plurality of holes arranged at equal intervals along the axial direction. Two symmetrically arranged dispensing structures are respectively arranged corresponding to the first hole group 21 and the second hole group 22, and each dispensing structure includes: A dispensing tube 33 is inserted into the pushing channel and is provided with an axially extending perfusion channel 331 , wherein the perfusion channel 331 is open at the proximal end and closed at the distal end; A plurality of rigid pins 34 are arranged equidistantly along the axial direction of the dispensing tube 33 and penetrate the side wall of the dispensing tube 33 at the same circumferential angle, and the inner end of each pin 34 is connected to the perfusion channel 331; The two dispensing structures are respectively a first dispensing structure 31 and a second dispensing structure 32. The pins 34 on the first dispensing structure 31 are plugged into the via holes of the first hole group 21 one by one, and the pins 34 on the second dispensing structure 32 are plugged into the via holes of the second hole group 22 one by one. The outer push rod 4 is axially movable and arranged between the two dispensing pipes 33; The dispensing structure has a first station and a second station relative to the outer sheath tube 2; First station: the outer push rod 4 is in the proximal initial position, the two dispensing tubes 33 are close to each other, and the tip of the insertion needle 34 is located in the through hole and does not pass through the outer wall of the outer sheath tube 2; Second station: the outer push rod 4 moves toward the distal end and wedges between the two dispensing tubes 33, forcing the two dispensing tubes 33 to move radially in opposite directions, so that each pin 34 passes through the outer wall of the outer sheath tube 2 along the long axis direction of the corresponding through hole.

[0026] The bone cement injection device of the present invention is used in cranioplasty, specifically, to inject bone cement into a repair module 1, wherein the repair module 1 includes a repair block and an impermeable membrane. The shape of the repair block is consistent with the shape of the skull to be repaired. The repair block is a mesh structure woven from nickel-titanium alloy wires. The impermeable membrane covers the lower surface of the repair block, and the edge of the impermeable membrane is sewn to the side of the repair block.

[0027] The repair block is preset with multiple filling channels 11 arranged side by side, for example, three filling channels 11 are set. The filling channels 11 are straight filling channels 11, and the entrances 12 of all filling channels 11 are located on the same side of the repair block. Multiple filling channels 11 are arranged at equal intervals in the left and right directions.

[0028] The shape of the patch can be obtained by scanning the bone window of the patient's head. That is, the shape of the patch for each patient is specific, and the specific shape and size are determined by the actual situation of the bone window of the patient's head.

[0029] The preparation method of the repair block can be obtained according to the following method.

[0030] S100, scanning the patient's skull to obtain first three-dimensional data of the bone window; the first three-dimensional data corresponds to the shape of the repair block; S200, generating second three-dimensional data corresponding to the filling channel 11 based on the three-dimensional data; S300, obtaining a prefabricated hose, the outer diameter of which is consistent with the inner diameter of the filling channel 11; S400, placing the prefabricated hose according to the second three-dimensional data; S500, weaving nickel-titanium alloy wire around the hose according to the first three-dimensional data to form an initial repair block; S600, heat setting the initial repair block; S700. Remove the hose and obtain the repair block.

[0031] Then, the anti-seepage membrane is sewn onto the lower side of the repair block to obtain the repair module 1.

[0032] Nickel-titanium alloy wire is a memory metal that can be deformed under the action of external force. After the external force is removed, the nickel-titanium alloy wire will return to its original state. That is to say, in the natural state, the shape of the repair module 1 basically corresponds to the first three-dimensional data (the anti-seepage membrane is a thin film, so the shape of the repair module 1 is basically equivalent to the shape of the repair block). Therefore, in the absence of external force, the repair module 1 can just cooperate with the bone window.

[0033] During the operation, a 2-3 cm long incision is made on the patient's scalp, and then surgical instruments are inserted through the incision to separate the myocutaneous flap and the pseudodura mater until the complete bone edge is exposed. A cavity is formed between the myocutaneous flap, the pseudodura mater and the bone edge. Normal saline is injected into the cavity to make the myocutaneous flap bulge. The repair module 1 is sent into the cavity through the incision. The position of the repair module 1 is adjusted so that the repair block is just filled into the bone window, with one side of the inlet 12 facing the incision. The normal saline in the cavity is discharged, and the surgical instruments are inserted into the The bone cement injection device (the outer sheath tube 2 and the two injection structures arranged in the outer sheath tube 2, which are in the first working position at this time) is inserted into the filling channel 11 along the inlet 12, so that the distal end of the outer sheath tube 2 reaches the blind end of the filling channel 11; for each bone cement injection device, the outer push rod 4 is wedged into the two injection structures from the back. The two dispensing tubes 33 are connected to each other, so that the two dispensing tubes 33 move in opposite directions, and the insertion needle 34 passes through the through hole and pierces the side wall of the filling channel 11, so that the needle head of the insertion needle 34 enters the interior of the repair block; the proximal end of the dispensing tube 33 is connected to the bone cement delivery device, and bone cement is injected into the perfusion channel 331 from the proximal end. The bone cement passes through the perfusion channel 331 and is ejected from the needle head of each insertion needle 34, so that the bone cement can be injected into the repair module 1 (the part outside the filling channel 11). Due to the two dispensing structures, Each dispensing structure has multiple pins 34, which make it possible to pour bone cement on both sides of the filling channel 11 so that the bone cement can fill the entire repair module 1; after the bone cement is filled, the outer push rod 4 is pulled out, and the two dispensing tubes 33 are moved inward, so that the dispensing structure is switched to the first working position, and then the bone cement injection device is withdrawn, and then the filling channel 11 is filled with bone cement through the auxiliary tube. After the bone cement hardens, the entire bone window can be filled, thereby ensuring the effectiveness of skull repair and improving the surgical effect.

[0034] When the bone cement injection device is withdrawn, the filling channel 11 is exposed, and there is a possibility that the filling channel 11 is not filled with bone cement. A straight auxiliary tube is inserted into the filling channel 11, and bone cement is filled into the filling channel 11 through the auxiliary tube. While filling the bone cement, the auxiliary tube is withdrawn backward, so that the filling channel 11 can be filled with bone cement, ensuring that the repair module 1 is filled with bone cement and the surgical effect is ensured.

[0035] A first hole group 21 and a second hole group 22 are provided on the outer sheath tube 2, and no matter in the first station or the second station, the pin 34 is plugged into the corresponding through hole, so that the pin 34 can only be pulled along the long axis direction of the through hole. The long axis directions of all the through holes are parallel to each other, so the dispensing tube 33 can only move along the long axis direction.

[0036] Initially, the two dispensing tubes 33 are close to each other (in the first working position). At this time, the needle head of the insertion needle 34 is just located in the through hole, so that the insertion needle 34 will not pass through the through hole, so that there is no protrusion on the outside of the outer sheath tube 2, which facilitates the outer sheath tube 2 to be inserted into the filling channel 11; by wedging the outer push rod 4 between the two dispensing tubes 33, the two dispensing tubes 33 can be moved away from each other, so that the insertion needle 34 passes through the through hole, and the bone cement injection device is switched from the first working position to the second working position. The switching method is simple and easy to operate.

[0037] The cross section of the outer sheath tube 2 is elliptical, and its long axis direction is collinear with the radial movement direction of the two dispensing structures; The cross section of the dispensing pipe 33 is a crescent shape with a convex outer side and a concave inner side, comprising: An outer convex arc surface matching the inner wall of the outer sheath tube 2, wherein the outer convex arc surface is in contact with the inner wall of the elliptical pushing channel in the second working position; The radially inwardly facing concave arc surface forms an initial transition channel 35 between the two concave arc surfaces when the two surfaces are in the first working position.

[0038] The cross-section of the outer sheath 2 is elliptical, the pushing channel is also elliptical, the major axis of the through hole is consistent with the major axis of the ellipse, and the length direction of the pin 34 is consistent with the major axis of the ellipse. The elliptical outer sheath 2 allows the length of the pin 34 to be set longer, so that when in the second workstation, the pin 34 can be fully inserted into the repair block, ensuring that the repair block can be effectively filled with bone cement.

[0039] The cross section of the dispensing tube 33 is crescent-shaped. In the second working position, the dispensing tube 33 can completely stick to the inner wall of the pushing channel, thereby supporting the outer sheath tube 2 and preventing the outer sheath tube 2 from being deformed when the bone cement is pumped in.

[0040] The setting of the concave arc surface forms an initial transition channel 35 between the two dispensing tubes 33 at the first working position, making it convenient for the outer push rod 4 to be inserted into the transition channel 35, thereby facilitating the separation of the two dispensing tubes 33.

[0041] After the outer push rod 4 is inserted into the transition channel 35 , the radial dimension of the outer push rod 4 is larger than the radial dimension of the transition channel 35 , thereby separating the two dispensing tubes 33 , that is, increasing the radial dimension of the transition channel 35 .

[0042] The distal end of the outer push rod 4 is provided with a conical guide portion. When the outer push rod 4 moves toward the distal end, the conical guide portion wedges between the inner concave arc surfaces of the two dispensing tubes 33, forcing the initial transition channel 35 to expand radially until the outer convex arc surfaces of the two dispensing tubes 33 fit the inner wall of the outer sheath tube 2.

[0043] The outer push rod 4 includes a conical guide portion and a long rod portion that are interconnected. The conical guide portion is located on the distal side of the long rod portion. From far to near, the radial dimension of the conical guide portion gradually increases, and the maximum radial dimension of the conical guide portion is consistent with the radial dimension of the long rod portion. When the outer push rod 4 is wedged between the two dispensing tubes 33, the tip of the conical guide portion can be easily inserted into the proximal end of the transition channel 35, so that the outer push rod 4 can be easily inserted into the transition channel 35. As the radial dimension of the inserted outer push rod 4 increases, the outer push rod 4 will abut against the two dispensing tubes 33, thereby squeezing the two dispensing tubes 33 apart from each other, thereby achieving the purpose of switching the dispensing structure to the second workstation.

[0044] The outer shape of the long rod portion of the outer push rod 4 is preferably elliptical. After the outer push rod 4 is fully inserted into the transition channel 35, if the long axis direction of the outer push rod 4 is consistent with the long axis direction of the outer sheath tube 2, the two dispensing tubes 33 are separated from each other to the farthest position, which is the second work position. At this time, the length of the extended needle 34 is the longest. If the short axis direction of the outer push rod 4 is consistent with the long axis direction of the outer sheath tube 2 (the two dispensing tubes 33 are always in contact with the outer push rod 4), the length of the needle 34 extending out of the outer sheath tube 2 will become smaller; therefore, the length of the needle 34 extending out of the outer sheath tube 2 can be controlled by rotating the outer push rod 4, thereby changing the position of the needle head of the needle 34 to ensure that the bone cement can fill the entire repair block.

[0045] In the long axis direction of the outer sheath tube 2, the first hole group 21 and the second hole group 22 are arranged opposite to each other; The dispensing tube 33 is divided into a distal first portion and a proximal second portion along its length, with the distal end of the perfusion channel 331 serving as the dividing line. The first portion is provided with a limiting hole 334 extending along its longitudinal axis. The limiting hole 334 includes a large-diameter section 333 and a small-diameter section 332 connected to each other. The large-diameter section 333 is located radially outward of the small-diameter section 332. The limiting holes 334 of the two dispensing pipes 33 are radially aligned; It also includes a limiting rod 36, and both ends of the limiting rod 36 are provided with a circular limiting portion 361; The limiting rod 36 passes through the two limiting holes 334 and slides with the small diameter section 332. At the second working position, the two limiting parts 361 are respectively inserted into the two large diameter sections 333 to limit the relative movement direction of the two dispensing tubes 33.

[0046] The distal end of the perfusion channel 331 is closed, and the solid structure at the closed end constitutes the first part. By setting a limiting hole 334 in the first part, for a single bone cement injection device, it only includes one limiting rod 36, and the limiting rod 36 passes through the limiting holes 334 of the two dispensing tubes 33 respectively, and the extension direction of the limiting rod 36 is consistent with the length direction of the insertion needle 34. In this way, the relative movement direction of the two dispensing tubes 33 is limited by the limiting rod 36 to ensure that the insertion needle 34 can slide smoothly along the through hole.

[0047] In addition, the limiting hole 334 includes a large diameter section 333 and a small diameter section 332 that are connected to each other, and a circular radially outward-protruding limiting portion 361 is provided at both ends of the limiting rod 36. That is to say, the diameter of the limiting portion 361 is larger than the inner diameter of the small diameter section 332 and is consistent with the inner diameter of the large diameter section 333. Therefore, the limiting portion 361 cannot pass through the small diameter section 332, so that the limiting hole 334 is always coordinated with the limiting rod 36 to prevent the dispensing tube 33 from detaching from the limiting rod 36.

[0048] The length of the first portion is no greater than 5 mm. The short length of the first portion allows the distal-most pin 34 to be as close as possible to the distal end of the filling channel 11, thereby allowing the distal end of the repair block to be filled with bone cement, ensuring that the bone cement can fully fill the interior of the repair block and ensure the surgical effect.

[0049] The second part includes a handheld portion and an insertion pin 34 portion connected to each other, the insertion pin 34 portion is located in the pushing channel, the handheld portion is located outside the pushing channel, and the insertion pin 34 is connected to the insertion pin 34 portion.

[0050] After the bone cement is injected through the needle 34, the two dispensing structures need to be switched to the first station. At this time, the outer push rod 4 is pulled out, and the two dispensing tubes 33 are moved inward respectively so that the two dispensing tubes 33 are close to each other. Since the hand-held part is located on the outside of the outer sheath 2, the two dispensing structures can be brought close to each other by controlling the hand-held part on the outside of the surgical port, thereby achieving the purpose of switching from the second station to the first station.

[0051] The outer sheath 2 is further provided with an auxiliary limiting member, the number of which is consistent with the number of the through-holes and corresponds one to one, the auxiliary limiting member includes an upper petal 23 and a lower petal 24 that are relatively spaced apart from each other, and a plug-in slot is formed between the upper petal 23 and the lower petal 24, and the auxiliary limiting member is connected to the periphery of the corresponding through-hole, and the length directions of the upper petal 23 and the lower petal 24 are both the long axis direction of the outer sheath 2, so that the plug-in slot is connected to the through-hole; At the first station, the pin 34 passes through the insertion slot.

[0052] Since the outer sheath 2 is relatively soft, that is, the outer sheath 2 will undergo a certain deformation under the action of external force, in the first working position, if the outer sheath 2 is flattened, the tip of the pin 34 will be separated from the through-hole. After the outer sheath 2 recovers, the needle head of the pin 34 cannot be reinserted into the through-hole, thereby affecting the progress of the operation.

[0053] The radial distal ends of the upper petal 23 and the lower petal 24 are connected to the inner wall of the outer sheath 2, and the radial inner ends of the upper petal 23 and the lower petal 24 are free ends (the whole is a cantilever structure), and a connecting groove is formed between the upper petal 23 and the lower petal 24, and the pin 34 is inserted into the connecting groove. That is to say, in the first working position, the pin 34 is restricted by the connecting groove, so even if the outer sheath 2 is subjected to a certain external force, so that the needle head of the pin 34 is out of the through hole, the pin 34 is always matched with the connecting groove, and the connecting groove is aligned with the through hole and directly connected. Therefore, after the outer sheath 2 is restored, the pin 34 can be guided by the connecting groove, and the needle head of the pin 34 can be located at the through hole again, ensuring the progress of subsequent surgery.

[0054] When the two dispensing pipes 33 move radially in opposite directions, the free ends of the upper petal 23 and the lower petal 24 contact the dispensing pipe 33 and bifurcate upward and downward, so that the upper petal 23 and the lower petal 24 do not affect the switching of the dispensing structure from the first station to the second station.

[0055] It should be understood that the above-mentioned embodiments are merely illustrative and non-restrictive. Without departing from the basic principles of the present invention, various obvious or equivalent modifications or substitutions that can be made by those skilled in the art to the above-mentioned details will be included in the scope of the claims of the present invention.

Claims

1. A bone cement injection device for skull repair, characterized in that: It includes an outer sheath, an injection structure and an outer push rod; An outer sheath tube having an axially extending push channel formed therein, wherein the outer sheath tube wall is provided with a first hole group and a second hole group symmetrically distributed along a 180° circumferential direction, each hole group comprising a plurality of through holes arranged at equal intervals along the axial direction; Two symmetrically arranged dispensing structures are respectively arranged corresponding to the first hole group and the second hole group, and each dispensing structure includes: A dispensing tube is inserted into the pushing channel and is provided with an axially extending perfusion channel, wherein the perfusion channel is open at the proximal end and closed at the distal end; A plurality of rigid pins are arranged at equal intervals along the axial direction of the dispensing tube and penetrate the side wall of the dispensing tube at the same circumferential angle, and the inner end of each pin is connected to the perfusion channel; The two dispensing structures are respectively a first dispensing structure and a second dispensing structure, wherein the pins on the first dispensing structure are plugged one by one with the via holes of the first hole group, and the pins on the second dispensing structure are plugged one by one with the via holes of the second hole group; An outer push rod is axially movably disposed between the two dispensing pipes; The dispensing structure has a first station and a second station relative to the outer sheath tube; First station: the outer push rod is in the proximal initial position, the two dispensing tubes are close to each other, and the tip of the insertion needle is located in the through hole and does not pass through the outer wall of the outer sheath tube; Second station: the outer push rod moves toward the distal end and wedges between the two dispensing tubes, forcing the two dispensing tubes to move radially in opposite directions, so that each pin passes through the outer wall of the outer sheath tube along the long axis direction of the corresponding through hole.

2. The bone cement injection device for skull repair according to claim 1, characterized in that: The cross section of the outer sheath is elliptical, and the long axis direction thereof is collinear with the radial movement direction of the two dispensing structures; The cross section of the dispensing pipe is a crescent shape with a convex outer side and a concave inner side, comprising: An outer convex arc surface matching the inner wall of the outer sheath tube, wherein the outer convex arc surface is in contact with the inner wall of the elliptical pushing channel in the second working position; The radially inwardly facing concave arc surface forms an initial transition channel between the two concave arc surfaces when the two surfaces are in the first working position.

3. The bone cement injection device for skull repair according to claim 2, characterized in that: The distal end of the outer push rod is provided with a conical guide portion. When the outer push rod moves toward the distal end, the conical guide portion wedges between the inner concave arc surfaces of the two dispensing tubes, forcing the initial transition channel to expand radially until the outer convex arc surfaces of the two dispensing tubes fit with the inner wall of the outer sheath tube.

4. The bone cement injection device for skull repair according to claim 1, characterized in that: In the long axis direction of the outer sheath tube, the first hole group and the second hole group are arranged opposite to each other; In the longitudinal direction of the dispensing tube, the dispensing tube is divided into a first portion located distally and a second portion located proximally, with the distal end of the perfusion channel as the dividing line. The first portion is provided with a limiting hole extending through along the longitudinal direction. The limiting hole includes a large-diameter section and a small-diameter section connected to each other, and the large-diameter section is located radially outward of the small-diameter section. The limiting holes of the two dispensing pipes are radially aligned; It also includes a limiting rod, with circular limiting parts at both ends of the limiting rod; The limiting rod passes through the two limiting holes and slides with the small diameter section. At the second station, the two limiting parts are respectively inserted into the two large diameter sections to limit the relative movement direction of the two dispensing pipes.

5. The bone cement injection device for skull repair according to claim 4, characterized in that: The length of the first portion is no greater than 5 mm.

6. The bone cement injection device for skull repair according to claim 4, characterized in that: The second part includes a handheld portion and a pin portion connected to each other, the pin portion is located in the pushing channel, the handheld portion is located outside the pushing channel, and the pin is connected to the pin portion.

7. The bone cement injection device for skull repair according to any one of claims 1 to 6, characterized in that: The outer sheath is further provided with an auxiliary limiting member, the number of the auxiliary limiting members is consistent with the number of the through holes and corresponds one to one, the auxiliary limiting member includes an upper petal and a lower petal that are relatively spaced apart from each other, a plug-in slot is formed between the upper petal and the lower petal, and the auxiliary limiting member is connected to the periphery of the corresponding through hole, and the length directions of the upper petal and the lower petal are both the long axis direction of the outer sheath, so that the plug-in slot is connected to the through hole; At the first station, the pin passes through the insertion slot.

8. The bone cement injection device for skull repair according to claim 7, characterized in that: When the two dispensing pipes move in opposite directions in the radial direction, the free ends of the upper petal and the lower petal contact the dispensing pipe and bifurcate upward and downward.

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