Bone cement advancement device

Abstract

The present invention discloses a bone cement propulsion device, which relates to the technical field of medical devices; it comprises a tubular structure and a push rod, wherein the two ends of the tubular structure are respectively a propulsion section and a front end, and a hole is provided on the side wall of the front end to form an outlet; the action of the push rod can make the contents in the tubular structure flow out from the outlet. The present invention can make the bone cement injection distributed in the stress concentration area where the end plate contacts the fusion device, while avoiding the bone grafting area in the middle of the fusion device, thereby achieving the purpose of balancing the end plate reinforcement and blood supply. The present invention can adjust the number of bone cement outlets and the injection position through the relative rotation of the outer tube and the inner tube, and selectively align the first injection hole structure and the second injection hole structure through the rotation between the outer tube and the inner tube, so as to form at least one outlet or a combination of two or more outlets on the tubular structure, so that the injection position and injection amount of the bone cement can be adjusted according to the actual treatment work, and the functions of fixed-point injection and quantitative injection can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a bone cement advancing device. Background Art

[0002] Intervertebral fusion is a common procedure in spinal surgery. The operation is as follows: first, the intervertebral disc of the diseased segment is removed, and then the intervertebral fusion material is implanted into the intervertebral space to restore intervertebral stability, which is called "reconstruction". The clinical effect of "reconstruction" mainly depends on the intervertebral bone graft material. Common intervertebral bone graft materials include ① autologous bone, ② allogeneic bone, and ③ artificial bone. The bone graft material is then loaded into the intervertebral fusion cage and implanted into the intervertebral space. After a period of time after the operation, the two vertebrae gradually grow into one.

[0003] The problem with the prior art is that some patients suffer from osteoporosis or the end plates are excessively damaged during surgery, which leads to the problem of postoperative fusion cage settling or even collapse.

[0004] In order to solve the above-mentioned problem of fusion cage settlement after intervertebral fusion surgery, the applicant proposed a technical solution of using polymethyl methacrylate (PMMA) bone cement to reinforce the stress end plates in contact with the upper and lower parts of the intervertebral fusion cage. Specifically, holes are made in the upper and lower vertebral bodies where the fusion cage is installed, and bone cement is injected into one side of the end plates in the holes to reinforce the upper and lower stress end plates in contact with the intervertebral fusion cage.

[0005] Since the aforementioned technical solution of bone cement reinforcement of stress endplate is a new application scenario of bone cement injection, the existing bone cement advancement device cannot be well applied. Specifically, in order to balance the relationship between endplate reinforcement and blood supply, it is necessary to limit the distribution of bone cement so that the bone cement is mainly distributed in the stress concentration area where the endplate contacts the fusion device, and avoids the bone grafting area, that is, the area where the artificial bone in the middle of the fusion device is located.

[0006] The Chinese invention patent with publication number CN105012005A discloses a bone cement propulsion device, comprising an outer tube and an inner tube, wherein a multi-layer first injection hole structure is arranged on the outer tube, and a multi-layer second injection hole structure is arranged on the inner tube. The inner tube and the outer tube are rotated to cooperate, so that when one layer of the first injection hole structure is connected to the corresponding second injection hole structure, the second injection hole structures of the remaining layers are staggered with the corresponding first injection hole structure. Although the bone cement propulsion device can realize the directional input of bone cement, it cannot realize quantitative input well, and cannot meet the purpose of balancing end plate reinforcement and blood supply in new application scenarios, and has limitations in use. Summary of the invention

[0007] In order to overcome the problem that the existing bone cement advancement device has limitations in the new application scenario of bone cement reinforcement of stress end plates, the present invention provides a bone cement advancement device that can balance the end plate reinforcement and blood supply purposes in the scenario of bone cement reinforcement of stress end plates.

[0008] The technical solution adopted by the present invention to solve the technical problem is:

[0009] A bone cement pushing device comprises a tubular structure and a push rod, wherein the two ends of the tubular structure are a pushing end and a front end respectively, a hole is arranged on the side wall of the front end to form an outlet, and the outlet connects the inner cavity and the outside of the tubular structure; the movement of the push rod can make the contents in the tubular structure flow out from the outlet; the tubular structure is a single tubular body, two outlets are formed on the side wall of the front end of the tubular body, the two outlets are spaced a certain distance apart, and the line connecting the center points of the two outlets is parallel to the axis of the tubular body; or the tubular structure comprises a plurality of tubular bodies, the front end side walls of the plurality of tubular bodies are all provided with holes, and the plurality of tubular bodies can form two outlets after being assembled, the two outlets are spaced a certain distance apart, and the line connecting the center points of the two outlets is parallel to the axis of the tubular body.

[0010] In the present invention, the outlet is formed on the side wall of the front end of the tubular structure, reducing the risk of bone cement overflowing the vertebral body due to excessive pressure caused by direct injection; by arranging two outlet positions in the same circumferential direction, the bone cement injection is distributed in the stress concentration area where the end plate and the fusion device are in contact, while avoiding the bone grafting area in the middle of the fusion device, thereby achieving the purpose of balancing the end plate reinforcement and blood supply; the two outlets in the axial direction of the tubular structure simultaneously flow out bone cement, which can shorten the injection time, reduce the intraoperative time, and avoid the patient from being exposed to CT for a long time.

[0011] In some embodiments, the tube body structure includes an inner tube and an outer tube, the outer tube is sleeved on the outside of the inner tube, the outer tube and the inner tube are rotatably matched, a first injection hole structure is provided on the side wall of the outer tube, and a second injection hole structure is provided on the side wall of the inner tube, and the outer tube and the inner tube include at least a first alignment state; the first alignment state is: two outlets are formed on the side wall of the front end of the tube body structure, the two outlets are spaced a certain distance apart, and the line connecting the center points of the two outlets is parallel to the axis of the tube body.

[0012] In this embodiment, the tube structure includes an inner tube and an outer tube, and is configured so that the outer tube and the inner tube can rotate together. This is to facilitate the regulation of the alignment state between the outer tube and the inner tube; when the outer tube and the inner tube do not form an outlet, it is also convenient for the loading of bone cement; when different outlets can be formed between the outer tube and the inner tube, it is easy to achieve. The first alignment state is achieved by the position layout of the first injection hole structure and the second injection hole structure, so that the bone cement injection is distributed in the stress concentration area where the end plate and the fusion device are in contact, while avoiding the bone grafting area in the middle of the fusion device, thereby achieving the purpose of balancing the end plate reinforcement and blood supply; and in the first alignment state, the two outlets in the axial direction of the outer tube flow out bone cement at the same time, which can shorten the injection time, reduce the intraoperative time, and avoid the patient from being exposed to CT for a long time.

[0013] In some embodiments, the outer tube and the inner tube are rotatably matched, and at least one of the first injection hole structure or the second injection hole structure is configured to include multiple groups of hole positions spaced apart in the axial direction of the inner tube, each group of hole positions is set to two, and different groups of hole positions are distributed in different directions around the inner tube; so that when the inner tube rotates relative to the outer tube, the distance between the two outlets in the first alignment state in the axial direction of the outer tube changes.

[0014] In this embodiment, the outer tube and the inner tube are rotationally matched, so that in the first alignment state, the distance between the two outlets can be changed to be adaptively adjusted according to the size of the patient's vertebral body.

[0015] In some embodiments, one of the first injection hole structure or the second injection hole structure includes strip holes, and the extension direction of the strip holes is consistent with the axis direction of the inner tube. The other includes multiple groups of hole positions spaced apart in the axis direction of the inner tube, and each group of hole positions is set to two, and different groups of hole positions are distributed in different directions around the inner tube; when the inner tube rotates relative to the outer tube, different groups of hole positions correspond to the strip holes, and the distance between the two outlets in the first alignment state changes in the axis direction of the outer tube.

[0016] In this embodiment, taking into account the convenience of adjustment and based on the orientation of the bone cement injection site during surgery, one of the preferred first injection hole structure and the second injection hole structure is set as a strip hole to facilitate the adjustment of the distance between the two outlets in the first alignment state.

[0017] In some embodiments, the outer tube and the inner tube are rotationally matched, and the outer tube and the inner tube further include a second alignment state; the second alignment state is: in the circumferential direction of the outer tube, the first injection hole structure and the second injection hole structure are aligned to form an outlet.

[0018] In this embodiment, the second alignment state is achieved through the position layout of the first injection hole structure and the second injection hole structure, so that the device can achieve lateral single-outlet injection to improve the applicability of the device.

[0019] In some embodiments, a third injection hole structure is opened at the front end of the outer tube, and a fourth injection hole structure is opened at the front end of the inner tube, and the outer tube and the inner tube include a third alignment state; the third alignment state is: the third injection hole structure and the fourth injection hole structure are aligned to form an outlet at the end of the outer tube.

[0020] In this embodiment, by opening a third injection hole structure at the end of the outer tube and a fourth injection hole structure at the end of the inner tube, the inner tube is rotated relative to the outer tube to achieve a third alignment state, so that the device can achieve forward single-outlet injection to improve the applicability of the device.

[0021] In some embodiments, a protrusion is provided on the tube structure, and the distance between the protrusion and the front end face of the tube structure in the axial direction of the tube structure is 38 mm-48 mm.

[0022] In this embodiment, a raised portion is provided on the tubular structure to limit the depth of insertion of the tubular structure into the vertebral body; when the tubular structure is composed of an inner tube and an outer tube, the raised portion is provided on the outer tube, and a raised portion is provided on the outer tube to limit the depth of insertion of the outer tube into the vertebral body. In practice, after drilling, the tubular structure is partially inserted into the vertebral body, and the raised portion is stuck on the vertebral body to limit further insertion of the tubular structure, thereby improving the safety of the device and facilitating the control of the injection site. The above dimensions are preferred settings based on the vertebral body size and the fusion device size.

[0023] In some embodiments, the protrusion is configured to be slidably connected to the tube structure, and the sliding direction is consistent with the axial direction of the tube structure.

[0024] In this embodiment, taking into account the differences in vertebral sizes of different patients, the preferred protrusions are slidably connected, so that in different surgeries, the fixed protrusions can be adjusted to different positions in the axial direction of the tubular structure according to actual scenarios, thereby further improving the applicability of the device.

[0025] In some embodiments, the distance between the centers of the two outlets formed on the front end side wall of the tube structure is 32 mm-45 mm.

[0026] In this embodiment, considering the conventional size of the human vertebral body, it is preferred to set the above outlet center distance. It is worth explaining that the outlet is conventionally a regular shape such as a circular or oblong hole, so the outlet center is easy to obtain; what is meant to be explained is that since the surgeon in this application is mainly used for patients with lumbar mutation diseases with osteoporosis, the bone structure is relatively loose. When the device of this embodiment is used, the outer tube and the inner tube body are not moving during the injection process, and the bone cement is directly diffused in the vertebral body. When the tubular structure is composed of an inner tube and an outer tube, the two outlets of the tubular structure here are in the same circumferential direction, that is, the two outlets when the outer tube and the inner tube are in the first alignment state.

[0027] In some embodiments, a supplementary tube is also included, the interior of the supplementary tube is connected to the interior of the tube structure, and the push rod is threadedly connected to the supplementary tube, so that when the push rod is rotated, the contents in the tube structure flow out from the outlet.

[0028] In this embodiment, a supplementary tube is provided and the push rod thread cooperates with the supplementary tube, so that the single injection volume of the device is increased, the intraoperative time is reduced, and the push rod is rotated and advanced to facilitate quantitative injection.

[0029] The beneficial effects of the present invention are:

[0030] The outlet is formed on the side wall of the tubular structure, reducing the risk of bone cement overflowing the vertebral body due to excessive pressure caused by direct injection; by arranging two outlet positions in the same circumferential direction, the bone cement injection is distributed in the stress concentration area where the end plate and the fusion device are in contact, while avoiding the bone grafting area in the middle of the fusion device, thereby achieving the purpose of balancing the end plate reinforcement and blood supply; the two outlets in the axial direction of the tubular structure flow out bone cement at the same time, which can shorten the injection time, reduce the intraoperative time, and avoid the patient from being exposed to CT for a long time. The present invention can adjust the number of bone cement outlets and the injection position through the relative rotation of the outer tube and the inner tube, and selectively align the first injection hole structure and the second injection hole structure through the rotation between the outer tube and the inner tube, so as to form at least one outlet or a combination of two or more outlets on the tubular structure, so that the injection position and injection amount of bone cement can be adjusted according to the actual treatment work, and the functions of fixed-point injection and quantitative injection can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic structural diagram of a tube structure in a bone cement advancing device provided in Embodiment 1 of the present invention;

[0032] Figure 2 A schematic diagram of the structure of a push rod in a bone cement advancing device provided in Embodiment 1 of the present invention;

[0033] Figure 3 A schematic diagram of the matching state of the bone cement advancing device provided in the first embodiment of the present invention;

[0034] Figure 4 for Figure 3 An enlarged view of the front end of the mid-tube structure;

[0035] Figure 5 A schematic diagram of the structure of the outer tube of the bone cement advancing device provided in the second embodiment of the present invention;

[0036] Figure 6 A schematic diagram of the structure of an inner tube in a bone cement advancing device provided in Embodiment 2 of the present invention;

[0037] Figure 7A schematic diagram of the matching state of the bone cement advancing device provided in the second embodiment of the present invention;

[0038] Figure 8 for Figure 7 An enlarged view of the front end of the mid-tube structure;

[0039] Fig. 9 A schematic diagram of the structure of the outer tube of the bone cement advancing device provided in the third embodiment of the present invention;

[0040] Fig.10 A schematic diagram of the structure of an inner tube in a bone cement advancing device provided in Embodiment 3 of the present invention;

[0041] Fig.11 A schematic diagram of the structure of the outer tube of the bone cement advancing device provided in the fourth embodiment of the present invention;

[0042] Fig.12 A schematic diagram of the structure of an inner tube in a bone cement advancing device provided in Embodiment 4 of the present invention;

[0043] Fig.13 A schematic diagram of the structure of the outer tube of the bone cement advancing device provided in the fifth embodiment of the present invention;

[0044] Fig.14 A schematic diagram of the structure of the outer tube of the bone cement propulsion device provided in Example 6 of the present invention;

[0045] Fig.15 A schematic diagram of the connection state of the inner tube, the supplementary tube and the push rod in the bone cement advancing device provided in the seventh embodiment of the present invention;

[0046] Fig.16 This is a schematic diagram of the disassembled state of the supplementary tube and the push rod in the bone cement advancing device provided in Example 7 of the present invention.

[0047] Marked in the figure, 0. outlet; 1. tube body structure; 2. push rod; 3. outer tube; 31. first injection hole structure; 32. third injection hole structure; 4. inner tube; 41. second injection hole structure; 42. fourth injection hole structure; 5. raised portion; 6. slide groove; 7. supplementary tube. DETAILED DESCRIPTION

[0048] The present invention is further described below in conjunction with the accompanying drawings.

[0049] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0050] Embodiment 1

[0051] like Figure 1-Figure 4As shown, the present invention provides a bone cement advancing device.

[0052] The bone cement pushing device comprises a tubular structure 1 and a push rod 2. The push rod 2 can be arranged in the tubular structure 1. The two ends of the tubular structure 1 are a pushing end and a front end respectively. A hole is provided on the side wall of the front end of the tubular structure 1 to form an outlet 0, and the outlet 0 connects the inner cavity of the tubular structure 1 and the outside.

[0053] In this embodiment, the push rod 2 is directly assembled and connected with the tube structure 1 , and the push rod 2 is pushed forward along the axis direction of the tube structure 1 to enable the contents in the tube structure 1 to flow out from the outlet 0 .

[0054] In this embodiment, the tube structure 1 is a single tube, and two outlets 0 are formed on the front end side wall of the tube structure 1. The two outlets 0 are distributed in the same position around the tube and are spaced a certain distance apart. The line connecting the center points of the two outlets 0 is parallel to the axial direction of the tube structure 1.

[0055] In the present application, outlet 0 is formed on the side wall of the tubular structure 1, reducing the risk of bone cement overflowing the vertebral body due to excessive pressure caused by direct injection; by arranging two outlets 0 in the same circumferential direction, the bone cement injection is distributed in the stress concentration area where the end plate and the fusion device are in contact, while avoiding the bone grafting area in the middle of the fusion device, thereby achieving the purpose of balancing the end plate reinforcement and blood supply; the two outlets 0 in the axial direction of the tubular structure 1 simultaneously flow out bone cement, which can shorten the injection time, reduce the intraoperative time, and avoid the patient from being exposed to CT for a long time.

[0056] The pushing end of the tubular structure 1 in the present application refers to a relatively open section, which is used for the push rod 2 to cooperate with the pushing end; the front end refers to a relatively closed end of the tubular structure 1, which is used for the injection of bone cement.

[0057] In this embodiment, the distance between the centers of the two outlets 0 at the same circumferential direction of the tubular structure 1, that is, the distance between the centers of the two outlets 0 formed on the front end side of the aforementioned tubular structure 1, is 32mm-45mm. Taking into account the conventional size of the human vertebral body, it is preferred to set the center distance of the outlet 0 as above. It is worth explaining that the outlet 0 is conventionally a regular shape such as a circular or oblong hole, so the center of the outlet 0 is easy to obtain; what is meant to be explained is that since the surgeon in this application is mainly used for patients with lumbar mutation diseases with osteoporosis, the bone structure is relatively loose. When the device of this embodiment is used, the main body of the outer tube 3 and the inner tube 4 does not move during the injection process, and the bone cement is directly diffused in the vertebral body.

[0058] In this embodiment, the tube body structure 1 is an integrated structure. In some embodiments, the tube body structure 1 includes multiple tube bodies, and holes are provided on the front end side walls of the multiple tube bodies. After the multiple tube bodies are assembled, two outlets 0 can be formed. The two outlets 0 are separated by a certain distance, and the line connecting the center points of the two outlets 0 is parallel to the axis of the tube body.

[0059] Embodiment 2

[0060] like Figure 5-Figure 8 As shown, the present invention provides a bone cement advancing device.

[0061] In this embodiment, relative to the first embodiment, the tube body structure 1 includes an inner tube 4 and an outer tube 3. The tube body structure 1 includes an inner tube 4 and an outer tube 3. The outer tube 3 is sleeved on the outside of the inner tube 4. The outer tube 3 and the inner tube 4 are rotatably matched. A first injection hole structure 31 is provided on the side wall of the outer tube 3. A second injection hole structure 41 is provided on the side wall of the inner tube 4. The outer tube 3 and the inner tube 4 include at least a first alignment state; the first alignment state is: in the same circumferential position of the outer tube 3, the first injection hole structure 31 and the second injection hole structure 41 are aligned to form two outlets 0, and the two outlets 0 are at a certain distance in the axial direction of the outer tube 3.

[0062] In this embodiment, when the tube structure 1 is composed of the inner tube 4 and the outer tube 3, the two outlets 0 when the outer tube 3 and the inner tube 4 are in the first alignment state are two outlets 0 at the same circumferential position of the tube structure 1 in the first embodiment. Preferably, the distance between the centers of the two outlets 0 is 32 mm-45 mm.

[0063] In this embodiment, the tubular structure 1 includes an inner tube 4 and an outer tube 3, and is configured so that the outer tube 3 and the inner tube 4 can rotate together. This is to facilitate the regulation of the alignment state between the outer tube 3 and the inner tube 4; when the outer tube 3 and the inner tube 4 do not form an outlet 0, it is also convenient for the loading of bone cement; when different outlets 0 can be formed between the outer tube 3 and the inner tube 4, it is convenient to achieve. The first alignment state is achieved by the position layout of the first injection hole structure 31 and the second injection hole structure 41, so that the bone cement injection is distributed in the stress concentration area where the end plate and the fusion device are in contact, while avoiding the bone grafting area in the middle of the fusion device, thereby achieving the purpose of balancing the end plate reinforcement and blood supply; and in the first alignment state, the two outlets 0 in the axial direction of the outer tube 3 flow out bone cement at the same time, which can shorten the injection time, reduce the intraoperative time, and avoid the patient from being exposed to CT for a long time.

[0064] In this embodiment, the first injection hole structure 31 is three holes distributed in the same direction around the outer tube 3 , and the second injection hole structure 41 is holes distributed at different positions around the inner tube 4 .

[0065] Combination Figure 6-Figure 8As shown, the second injection hole structure 41 is divided into three groups of holes according to the different circumferential positions distributed on the inner tube 4, one of which includes two front and rear injection holes to achieve the first alignment state of the outer tube 3 and the inner tube 4: at the same circumferential position of the outer tube 3, the first injection hole structure 31 and the second injection hole structure 41 are aligned to form two outlets 0, and the two outlets 0 are at a certain distance in the axial direction of the outer tube 3; the other two groups include one injection hole, and the injection hole distribution corresponds to one first injection hole structure 31 to achieve the second alignment state of the outer tube 3 and the inner tube 4; the second alignment state is: on the front end side wall of the outer tube 3, the first injection hole structure 31 and the second injection hole structure 41 are aligned to form an outlet 0.

[0066] In this embodiment, the second alignment state is achieved through the position layout of the first injection hole structure 31 and the second injection hole structure 41, so that the device can achieve lateral single-outlet 0 injection to improve the applicability of the device.

[0067] Obviously, in this embodiment, the three second injection hole structures 41 are not limited to being arranged at the same circumferential position. In this embodiment, the position of the second injection hole structure 41 at the middle position can be adjusted.

[0068] Obviously, in this embodiment, the positions of the first injection hole structure 31 and the second injection hole structure 41 can be relatively interchangeable, so that the hole position of the current first injection hole structure 31 is set on the side wall of the inner tube 4, and the hole position of the current second injection hole structure 41 is set on the side wall of the outer tube 3. No specific restrictions are made here. Considering that the outer tube 3 contacts the patient's human tissue, the preferred first injection hole structure 31 is configured in the same circumferential orientation. At this time, the multiple holes corresponding to the first injection hole structure 31 are fixed in the circumferential position of the outer tube 3. After being inserted into the human body, the outer tube 3 does not need to be rotated. By rotating the inner tube 4, the inner tube 4 and the outer tube 3 can be transformed between the first alignment state and the second alignment state.

[0069] Obviously, the inner wall size of the inner tube 4 should be compatible with the outer wall size of the outer tube 3, so as to achieve the outflow of bone cement as much as possible and reduce the retention of bone cement between the inner tube 4 and the outer tube 3.

[0070] Obviously, there is no specific limitation on the number of holes corresponding to the first injection hole structure 31 and the second injection hole structure 41 , as long as the corresponding hole shapes are suitable for bone cement injection.

[0071] When the outer tube 3 and the inner tube 4 are rotatably matched, preferably, the relatively open ends of the outer tube 3 and the inner tube 4 are correspondingly provided with scales or other markings to clarify the current alignment status of the outer tube 3 and the inner tube 4.

[0072] Embodiment 3

[0073] like Fig. 9 and Fig.10As shown, the present invention provides a bone cement advancing device.

[0074] In this embodiment, the outer tube 3 and the inner tube 4 are rotatably matched, and at least one of the first injection hole structure 31 or the second injection hole structure 41 is configured to include multiple groups of hole positions spaced apart in the axial direction of the inner tube 4, each group of hole positions is set to two, and different groups of hole positions are distributed in different circumferential directions of the inner tube 4; so that when the inner tube 4 rotates relative to the outer tube 3, the distance between the two outlets 0 in the first alignment state in the axial direction of the outer tube 3 changes.

[0075] In this embodiment, the outer tube 3 and the inner tube 4 are rotationally matched, so that in the first alignment state, the distance between the two outlets can be changed to be adaptively adjusted according to the size of the patient's vertebral body.

[0076] Specifically, in this embodiment, the outer tube 3 is provided with a plurality of groups of holes in the circumferential direction, and each group of holes has two holes.

[0077] Obviously, multiple groups of holes can be set on the inner tube 4 to achieve the first alignment state. When the inner tube 4 is set with different groups of holes set circumferentially on the outer tube 3 for comparison, the production and adjustment process are relatively complicated. Therefore, in this embodiment, it is preferred that the second injection hole structure 41 includes strip holes, and the extension direction of the strip holes is consistent with the axial direction of the inner tube 4. The first injection hole structure 31 includes multiple groups of holes distributed in the axial direction of the inner tube 4, and each group of holes is set to two. Different groups of holes are distributed in different directions around the inner tube 4; when the inner tube 4 rotates relative to the outer tube 3, different groups of holes correspond to the strip holes, thereby achieving a change in the distance between the two outlets 0 in the axial direction of the outer tube 3 in the first alignment state.

[0078] In this embodiment, taking into account the convenience of adjustment and based on the orientation of the bone cement injection site during surgery, one of the first injection hole structure 31 and the second injection hole structure 41 is preferably set as a strip hole to facilitate the adjustment of the 0 distance between the two outlets in the first alignment state.

[0079] Obviously, in this embodiment, the positions of the first injection hole structure 31 and the second injection hole structure 41 can be relatively interchangeable, so that the hole position of the current first injection hole structure 31 is set on the side wall of the inner tube 4, and the hole position of the current second injection hole structure 41 is set on the side wall of the outer tube 3. No specific limitation is made here.

[0080] Taking into account that the outer tube 3 contacts the patient's body tissue, the first injection hole structure 31 may preferably be configured as a strip hole. At this time, the circumferential position of the outer tube 3 where the strip hole is located is fixed. After being inserted into the human body, the outer tube 3 does not need to be rotated. The adjustment of the distance between the two outlets 0 in the first alignment state can be achieved by rotating the inner tube 4.

[0081] Alternatively, a strip hole is set according to the positions of the two required outlets. In this embodiment, one strip hole is set. In practice, two strip holes can be set according to the adjustable range of the front and rear hole positions; or one of the front and rear hole positions is fixed, and a strip hole is set corresponding to the other hole position. In this embodiment, one strip hole covers two optional outlet positions, which is convenient for processing and implementation.

[0082] Embodiment 4

[0083] like Fig.11 and Fig.12 As shown, the present invention provides a bone cement advancing device.

[0084] In this embodiment, based on the second embodiment, a third injection hole structure 32 is opened at the front end of the outer tube 3, and a fourth injection hole structure 42 is opened at the front end of the inner tube 4. The outer tube 3 and the inner tube 4 include a third alignment state; the third alignment state is: the third injection hole structure 32 and the fourth injection hole structure 42 are aligned on the front end face of the tube body structure 1 to form an outlet 0.

[0085] In this embodiment, by opening a third injection hole structure 32 at the end of the outer tube 3 and a fourth injection hole structure 42 at the end of the inner tube 4, the inner tube 4 is rotated relative to the outer tube 3 to achieve a third alignment state, so that the device can achieve forward single outlet 0 injection to improve the applicability of the device.

[0086] In this embodiment, preferably, the first alignment state and the third alignment state are not realized at the same time. Obviously, adaptive adjustment can be made according to the actual use scenario.

[0087] In this embodiment, the third injection hole structure 32 and the fourth injection hole structure 42 are both shaped as a part of a circle and are distributed on the end surface. Obviously, when implemented according to this shape, the sum of the total areas of the two corresponding holes should not be greater than the front end surface area of ​​the inner tube 4, so as to avoid always achieving the third alignment state.

[0088] Obviously, the number and shape of the corresponding holes in the third injection hole structure 32 and the fourth injection hole structure 42 in the figure are only exemplary examples and are not specifically limited here.

[0089] Embodiment 5

[0090] like Fig.13 As shown, the present invention provides a bone cement advancing device.

[0091] In this embodiment, based on the second embodiment, a protrusion 5 is provided on the tube structure 1, and the distance between the protrusion 5 and the front end surface of the tube structure 1 in the axial direction of the tube structure 1 is 38 mm-48 mm.

[0092] In this embodiment, the tubular structure 1 is composed of an inner tube 4 and an outer tube 3, and a protrusion 5 is arranged on the outer tube 3. The protrusion 5 is arranged on the outer tube 3 to limit the insertion depth of the outer tube 3 into the vertebral body. In practice, after drilling, the tubular structure 1 is partially inserted into the vertebral body, and the protrusion 5 is stuck on the vertebral body to limit the further insertion of the tubular structure 1, thereby improving the safety of the device and facilitating the control of the injection site. The above size is a preferred setting based on the vertebral body size and the fusion device size.

[0093] Embodiment 6

[0094] like Fig.14 As shown, the present invention provides a bone cement advancing device.

[0095] Compared with the fifth embodiment, the shape of the protrusion 5 in this embodiment is different, and the protrusion 5 is configured to be slidably connected to the tube structure 1, and the sliding direction is consistent with the axial direction of the tube structure 1. Fig.14 As shown, a sliding groove is provided on the outer tube 3 for sliding connection of the protrusion 5 .

[0096] In this embodiment, taking into account the differences in vertebral sizes of different patients, the preferred protrusion 5 is slidably connected, so that in different surgeries, the fixed protrusion 5 can be adjusted to different positions in the axial direction of the tubular structure 1 according to actual scenarios, thereby further improving the applicability of the device.

[0097] By comparing the fifth embodiment with the sixth embodiment, it can be seen that the shape of the protrusion 5 is not specifically limited in the present application, as long as it can achieve the abutment against the vertebral body for limiting.

[0098] Embodiment 7

[0099] like Fig.15 and Fig.16 As shown, the present invention provides a bone cement advancing device.

[0100] In this embodiment, a supplementary tube 7 is additionally provided compared to the second embodiment, and the push rod 2 is directly connected to the supplementary tube 7, and the interior of the supplementary tube 7 is connected to the interior of the inner tube 4, so that the push rod 2 is actuated to enable the contents in the inner tube 4 to flow out from the outlet 0.

[0101] In practice, the bone cement pusher is limited by the size of the vertebral body, the diameter of the outer tube 3 is relatively small, and for reasons such as convenience during surgery, the length of the bone cement pusher is also limited, resulting in a single injection of the bone cement pusher failing to meet surgical requirements. Multiple sets of devices need to be prepared for injection, and the replacement and installation of the bone cement pusher will take time. Once the bone cement comes into contact with the air, it will solidify quickly. When multiple sets of devices are injected, bone cement will be wasted and the injection continuity will be poor.

[0102] Therefore, in this embodiment, a supplementary tube 7 is preferably provided, and the outer wall size of the supplementary tube 7 is not limited by the inner wall size of the outer tube 3, and the supplementary tube 7 can be connected to the outside of the human body, so that it can be implemented in a larger size. Specifically, the outer wall size of the supplementary tube 7 is larger than the outer tube 3, which can better store bone cement and save time during surgery.

[0103] Furthermore, in this embodiment, the push rod 2 and the supplementary tube 7 are threadedly connected, the supplementary tube 7 has an internal thread, and the end of the push rod 2 has an external thread, so that when the push rod 2 is rotated, the push rod 2 is pushed relative to the supplementary tube 7, thereby squeezing the bone cement and causing the bone cement in the inner tube 4 to overflow.

[0104] The push rod 2 and the supplementary tube 7 are threadedly connected. At this time, the corresponding advancement amount is fixed every time the push rod 2 rotates one circle, thereby facilitating the quantitative injection of bone cement.

[0105] In practice, when the push rod 2 is rotated, the supplementary tube 7 should be in a fixed state to prevent it from rotating. Thus, the inner tube 4 connected thereto is prevented from rotating. In practice, the supplementary tube 7 and the inner tube 4 may be preferably connected by a flexible tube, which can withstand a certain torque, thereby playing a foolproof effect and further preventing the inner tube 4 from rotating. Obviously, the technical solution for preventing the inner tube 4 from rotating is not limited to this, for example, the inner tube 4 and the outer tube 3 have a snap-fit ​​structure, etc., which will not be described in detail here.

[0106] Obviously, scale lines may be provided on the replenishing tube 7, or angle scales for observing the rotation amount of the push rod 2 may be provided on the replenishing tube 7 or the push rod 2, so as to visually observe the injection amount.

[0107] Obviously, a valve may be provided on the connecting pipeline between the supplementary pipe 7 and the inner pipe 4 to open and close the flow passage from the supplementary pipe 7 to the inner pipe 4 .

[0108] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bone cement pushing device, comprising a tubular structure (1) and a push rod (2); The two ends of the tube structure (1) are respectively a propulsion end and a front end, and a hole is provided on the front end to form an outlet (0), and the outlet (0) communicates with the inner cavity of the tube structure (1) and the outside; The push rod (2) moves to allow the contents in the tube structure (1) to flow out from the outlet (0); Its characteristics are: The tube structure (1) comprises a plurality of tubes, each of which has a hole on its front end side wall. The plurality of tubes can be assembled to form two outlets (0), the two outlets (0) are spaced a certain distance apart, and the line connecting the center points of the two outlets (0) is parallel to the axis of the tube; The tube body structure (1) comprises an inner tube (4) and an outer tube (3), the outer tube (3) being sleeved on the outer side of the inner tube (4), the outer tube (3) and the inner tube (4) being rotatably matched, a first injection hole structure (31) being provided on the side wall of the outer tube (3), a second injection hole structure (41) being provided on the side wall of the inner tube (4), and the outer tube (3) and the inner tube (4) at least comprising a first alignment state; the first alignment state being: two outlets (0) being formed on the front end side wall of the tube body structure (1), the two outlets (0) being spaced a certain distance apart, and a line connecting the center points of the two outlets (0) being parallel to the axis of the tube body; At least one of the first injection hole structure (31) or the second injection hole structure (41) is configured to include a plurality of groups of hole positions spaced apart in the axial direction of the inner tube (4), each group of hole positions being provided with two hole positions, and different groups of hole positions being distributed in different circumferential directions of the inner tube (4); so that when the inner tube (4) rotates relative to the outer tube (3), the distance between the two outlets (0) in the first alignment state in the axial direction of the outer tube (3) changes.

2. The bone cement advancing device according to claim 1, characterized in that: One of the first injection hole structure (31) or the second injection hole structure (41) comprises a strip hole, the extension direction of the strip hole is consistent with the axial direction of the inner tube (4), and the other comprises a plurality of groups of hole positions spaced apart in the axial direction of the inner tube (4), each group of hole positions is provided with two, and different groups of hole positions are distributed in different circumferential directions of the inner tube (4); when the inner tube (4) rotates relative to the outer tube (3), different groups of hole positions correspond to the strip holes, and the distance between the two outlets (0) in the axial direction of the outer tube (3) in the first alignment state changes.

3. The bone cement advancing device according to claim 1, characterized in that: The outer tube (3) and the inner tube (4) are rotatably matched, and the outer tube (3) and the inner tube (4) further comprise a second alignment state; the second alignment state is: on the front end side wall of the tube body structure (1), the first injection hole structure (31) and the second injection hole structure (41) are aligned to form an outlet (0).

4. The bone cement advancing device according to claim 1, characterized in that: A third injection hole structure (32) is provided at the front end of the outer tube (3), and a fourth injection hole structure (42) is provided at the front end of the inner tube (4). The outer tube (3) and the inner tube (4) comprise a third alignment state; the third alignment state is that the third injection hole structure (32) and the fourth injection hole structure (42) are aligned to form an outlet (0) on the front end face of the tube body structure (1).

5. The bone cement advancing device according to claim 1, characterized in that: A raised portion (5) is provided on the tube structure (1), and the distance between the raised portion (5) and the front end face of the tube structure (1) in the axial direction of the tube structure (1) is 38 mm to 48 mm.

6. The bone cement advancing device according to claim 5, characterized in that: The raised portion (5) is configured to be slidably connected to the tubular structure (1), and the sliding direction is consistent with the axial direction of the tubular structure (1).

7. The bone cement advancing device according to claim 1, characterized in that: The distance between the centers of the two outlets (0) formed on the front end side wall of the tube structure (1) is 32 mm to 45 mm.

8. The bone cement advancing device according to any one of claims 1 to 7, characterized in that: It also comprises a replenishing pipe (7), the interior of the replenishing pipe (7) is connected to the interior of the tube body structure (1), and the push rod (2) is threadedly connected to the replenishing pipe (7), so that when the push rod (2) rotates, the contents in the tube body structure (1) flow out from the outlet (0).

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