Atlantoaxial bone grafting device

Abstract

The utility model relates to the technical field of medical instruments, in particular to an atlantoaxial bone grafting device. The atlantoaxial bone grafting device comprises a bone grafting funnel and a bone grafting device, wherein the bone grafting funnel comprises a hollow pipe part and a funnel part arranged at the top end of the hollow pipe part; the funnel pushing piece comprises a first pushing rod and a pushing part arranged at the top end of the first pushing rod; wherein the first pushing rod can be arranged in the hollow pipe part, and when the pushing part is limited above the opening in the top end of the hollow pipe part, the bottom end of the first pushing rod extends out of the opening in the bottom end of the hollow pipe part; the bottom end of the first pushing rod is a flat and blunt end. According to the technical scheme, the surgical instrument for bone grafting of the atlantoaxial lateral mass joint is provided, bone grafting is accurately and effectively completed through one-time operation of the bone grafting funnel, the surgical operation difficulty is remarkably reduced, the bleeding risk is reduced, the surgical time is shortened, and the postoperative fusion rate is increased.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of medical devices, in particular to a C1-C2 bone grafting device. BACKGROUND

[0002] Atlantoaxial dislocation is a serious disease in the craniocervical junction, and its typical symptoms include neck pain, gait instability, limb weakness, and possible cervical spinal cord compression, which threatens the safety of patients. Therefore, timely surgical intervention to restore atlantoaxial stability and relieve spinal cord compression is the main way to treat atlantoaxial dislocation.

[0003] At present, posterior atlantoaxial screw rod internal fixation has become one of the most common surgical methods due to its good biomechanical stability and safety. The core of the surgery is to achieve effective reduction and fixation of atlantoaxial dislocation by reconstructing the stable structure of the atlantoaxial joint. Long-term atlantoaxial stability mainly depends on postoperative bone fusion, therefore, bone grafting is crucial in atlantoaxial internal fixation.

[0004] In the existing atlantoaxial lateral mass joint bone grafting surgery, there is no matching bone grafting instrument, and the bone grafting operation is difficult. Due to the narrow space between the atlantoaxial lateral mass joints, using traditional surgical tools such as forceps to gradually put the bone particles into the joint space can easily tear the posterior venous plexus, and the risk of bleeding is high. It is also easy to have an undesirable bone particle position, and the bone particles may sometimes be left in the medial spinal canal or lateral vertebral artery hole, increasing the risk of spinal cord and vertebral artery compression. Such problems not only prolong the operation time, but also increase the incidence of intraoperative bleeding and postoperative complications. CONTENT OF THE UTILITY MODEL

[0005] In order to solve the problems in the related art, the present disclosure provides a C1-C2 bone grafting device.

[0006] A C1-C2 bone grafting device is provided in the present disclosure, which comprises:

[0007] The bone grafting funnel comprises a hollow tube portion and a funnel portion arranged at the top end of the hollow tube portion.

[0008] The funnel pushing member comprises a first pushing rod and a pushing portion arranged at the top end of the first pushing rod. The first pushing rod can be placed in the hollow tube portion, and when the pushing portion is limited above the top end opening of the hollow tube portion, the bottom end of the first pushing rod extends out of the bottom end opening of the hollow tube portion. The bottom end of the first pushing rod is a blunt end.

[0009] According to the present disclosure, the pushing portion comprises an arc surface body matched with the inner arc surface of the funnel portion and a first holding portion arranged on the arc surface body.

[0010] According to an embodiment of the present disclosure, the arc surface body is a lower hemisphere; and the first holding part is an upper hemisphere matched with the outer arc surface of the funnel part.

[0011] According to an embodiment of the present disclosure, the atlas-axis bone grafting device further comprises a bone grain pushing member.

[0012] According to an embodiment of the present disclosure, the bone grain pushing member comprises a second pushing rod and a second holding part arranged at the top end of the second pushing rod; wherein the second pushing rod can be placed in the hollow tube part, and when the second holding part is limited above the top end opening of the hollow tube part, the bottom end of the second pushing rod extends out of the bottom end opening of the hollow tube part; the bottom end surface of the second pushing rod is a plane.

[0013] According to an embodiment of the present disclosure, a depth limiting member is arranged on the second pushing rod, and the maximum outer diameter of the depth limiting member is greater than the inner diameter of the top end opening of the hollow tube part.

[0014] According to an embodiment of the present disclosure, the second holding part is a sphere.

[0015] According to an embodiment of the present disclosure, the top end opening of the hollow tube part is a circle; and / or the bottom end opening of the hollow tube part is a rounded rectangle.

[0016] According to an embodiment of the present disclosure, the atlas-axis bone grafting device comprises a bone grafting funnel comprising a hollow tube part and a funnel part arranged at the top end of the hollow tube part; and a funnel pushing member comprising a first pushing rod and a pushing part arranged at the top end of the first pushing rod; wherein the first pushing rod can be placed in the hollow tube part, and when the pushing part is limited above the top end opening of the hollow tube part, the bottom end of the first pushing rod extends out of the bottom end opening of the hollow tube part; and the bottom end of the first pushing rod is a blunt end. The above technical solution provides a surgical instrument for atlas-axis lateral mass joint bone grafting. First, the funnel pushing member is assembled with the bone grafting funnel, the bottom end of the first pushing rod extends out of the bottom end opening of the hollow tube part, and since the bottom end of the first pushing rod is designed as a blunt end, the joint space can be safely expanded to safely send the bone grafting funnel, then the funnel pushing member is withdrawn, and the bone grafting is accurately and effectively completed at one time through the bone grafting funnel, which significantly reduces the operation difficulty, reduces the risk of bleeding and operation time, and improves the postoperative fusion rate.

[0017] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A structure schematic diagram of an atlas-axis bone grafting device according to an embodiment of the present disclosure is shown.

[0019] Figure 2 A structural schematic diagram of a bone grafting funnel is shown according to an embodiment of the present disclosure.

[0020] Figure 3 A structural schematic diagram of a funnel pushing member is shown according to an embodiment of the present disclosure.

[0021] Figure 4 An assembly relationship schematic diagram of a bone grafting funnel and a funnel pushing member is shown according to an embodiment of the present disclosure.

[0022] Figure 5 A structural schematic diagram of a stock grain pushing member is shown according to an embodiment of the present disclosure.

[0023] Figure 6 An assembly relationship schematic diagram of a bone grafting funnel and a stock grain pushing member is shown according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0024] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so as to be easily implemented by those skilled in the art. Also, portions irrelevant to the description of the exemplary embodiments are omitted in the accompanying drawings for the sake of clarity.

[0025] In the present disclosure, it should be understood that terms such as "include" or "have" are intended to indicate that there are features, numbers, steps, actions, components, parts or combinations thereof disclosed in the specification, and do not exclude the possibility of one or more other features, numbers, steps, actions, components, parts or combinations thereof existing or being added.

[0026] It should also be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0027] In the existing atlantoaxial lateral mass joint bone grafting surgery, since there is no matching bone grafting instrument, the bone grafting operation is difficult, and since the atlantoaxial lateral mass joint gap is narrow, when the bone grains are gradually put into the joint gap by using traditional surgical tools such as tweezers, the posterior venous plexus is easily torn, and the risk of bleeding is high. It is also easy to appear that the position of the bone grain is not ideal, and the bone grain is sometimes left in the inner wall of the spinal canal or the lateral vertebral artery hole, increasing the risk of compression of the spinal cord and vertebral artery. Such problems not only prolong the operation time, but also increase the incidence of intraoperative bleeding and postoperative complications.

[0028] In view of the above defects, the present disclosure provides an atlas-axis bone grafting device, which provides a surgical instrument for atlas-axis lateral mass joint bone grafting. First, the funnel pushing member is assembled with the bone grafting funnel, the bottom end of the first pushing rod extends out of the bottom end opening of the hollow tube part, and since the bottom end of the first pushing rod is designed as a blunt end, the joint space can be safely expanded to safely send the bone grafting funnel, then the funnel pushing member is withdrawn, and the bone grafting is accurately and effectively completed at one time through the bone grafting funnel, which significantly reduces the operation difficulty, reduces the risk of bleeding and operation time, and improves the postoperative fusion rate.

[0029] Figure 1 A structure diagram of an atlas-axis bone grafting device according to an embodiment of the present disclosure is shown. Figure 2 A structure diagram of a bone grafting funnel according to an embodiment of the present disclosure is shown. Figure 3 A structure diagram of a funnel pushing member according to an embodiment of the present disclosure is shown. Figure 4 An assembly relationship diagram of a bone grafting funnel and a funnel pushing member according to an embodiment of the present disclosure is shown.

[0030] As shown in the drawings, Figures 1 to 4 The atlas-axis bone grafting device includes a bone grafting funnel 10 and a funnel pushing member 20. The bone grafting funnel 10 includes a hollow tube part 11 and a funnel part 12 arranged at the top end of the hollow tube part 11; the funnel pushing member 20 includes a first pushing rod 21 and a pushing part 22 arranged at the top end of the first pushing rod 21; wherein the first pushing rod 21 can be placed in the hollow tube part 11, and when the pushing part 22 is limited above the top end opening of the hollow tube part 11, the bottom end of the first pushing rod 21 extends out of the bottom end opening of the hollow tube part 11; the bottom end of the first pushing rod 21 is a blunt end. The bottom end of the first pushing rod is designed as a blunt end, which helps to smoothly guide the instrument into the atlas-axis lateral mass joint and safely expand the joint space without damaging key structures such as venous plexus and vertebral artery.

[0031] In the present disclosure, the top end opening of the hollow tube part 11 is circular; and / or, the bottom end opening of the hollow tube part 11 is a rounded rectangle. By designing the bottom end opening of the hollow tube part as a rounded rectangle, it matches the anatomical structure of the atlas-axis lateral mass joint and is suitable for placing granular cancellous bone, autologous bone blocks or allogeneic bone and other bone grafting materials.

[0032] In the present disclosure, the spherical funnel shape of the funnel part 12 allows batch placement of bone grafting materials during bone grafting operations, reducing the operational difficulties caused by grain-by-grain placement.

[0033] In the present disclosure, when the top end opening of the hollow tube portion 11 is circular and the bottom end opening of the hollow tube portion 11 is a rounded rectangle, the shape of the first pushing rod 21 is adapted to the hollow tube portion 11. That is, the top end of the first pushing rod 21 is circular and the bottom end is a rounded rectangle.

[0034] In the present disclosure, the pushing portion 22 comprises an arc surface body 221 adapted to the inner arc surface of the funnel portion 12 and a first holding portion 222 arranged on the arc surface body 221. In a specific embodiment, the arc surface body 221 is a lower hemisphere and the first holding portion 222 is an upper hemisphere adapted to the outer arc surface of the funnel portion 12. When the lower hemisphere is attached to the inner arc surface of the funnel portion, the upper hemisphere can be attached to the upper surface of the funnel portion, and at the same time, the bottom end of the first pushing rod extends out of the bottom end opening of the hollow tube portion, exposing the blunt end of the first pushing rod.

[0035] With reference to Figure 1 , the atlas-axis vertebra bone grafting device further comprises a bone particle pushing member 30.

[0036] Figure 5 A structural schematic diagram of the bone particle pushing member according to an embodiment of the present disclosure is shown. Figure 6 A schematic diagram of the assembly relationship between the bone grafting funnel and the bone particle pushing member according to an embodiment of the present disclosure is shown.

[0037] With reference to Figure 5 , Figure 6 As shown in the figure, the bone particle pushing member 30 comprises a second pushing rod 31 and a second holding portion 32 arranged at the top end of the second pushing rod 31; wherein the second pushing rod 31 can be placed in the hollow tube portion 11, and when the second holding portion 32 is limited above the top end opening of the hollow tube portion 11, the bottom end of the second pushing rod 31 extends out of the bottom end opening of the hollow tube portion 11; the bottom end surface of the second pushing rod 31 is a plane. The bottom end surface of the second pushing rod is designed as a plane, which can achieve accurate placement of bone particles and ensure uniform distribution and firm embedding of bone particles.

[0038] In the present disclosure, when the top end opening of the hollow tube portion 11 is circular and the bottom end opening of the hollow tube portion 11 is a rounded rectangle, the shape of the second pushing rod 31 is adapted to the hollow tube portion 11. That is, the top end of the second pushing rod 31 is circular and the bottom end is a rounded rectangle.

[0039] In the present disclosure, a depth limiting member 33 is arranged on the second pushing rod 31, and the maximum outer diameter of the depth limiting member 33 is greater than the inner diameter of the top end opening of the hollow tube portion 11. By arranging the depth limiting member, the depth of the pushing rod can be strictly ensured to not exceed the bone grafting area at the front end of the funnel portion when pushed in, thereby preventing excessive entry into the joint space and avoiding damage caused by misoperation.

[0040] In the present disclosure, the second holding part 32 is a ball. It can be understood that the second holding part can also be a handle or other structure, and the present disclosure does not limit this.

[0041] The current atlantoaxial dislocation surgery usually adopts a posterior fixation and bone grafting technique, including the following main steps:

[0042] Exposure: first expose the atlantoaxial complex through a posterior cervical incision.

[0043] Internal fixation: perform atlantoaxial screw-rod internal fixation, and achieve atlantoaxial reduction and stability by adjusting the gradient of the titanium rod and the atlas screw

[0044] Bone harvesting: usually use forceps to obtain 15-20 particles of bone particles with a diameter of about 1 millimeter from the lamina and spinous process of the axis as bone grafting material.

[0045] Lateral mass interarticular bone grafting: while fully protecting the C2 nerve root and intervertebral venous plexus, use a reamer and curette to clean the cartilage surface between the lateral mass of the atlantoaxial joint to facilitate bone grafting.

[0046] Hemostasis and suturing: after proper hemostasis, place a drainage device and close the incision.

[0047] The atlantoaxial bone grafting device provided by the present disclosure is applied to the lateral mass interarticular bone grafting step. Specifically, first, the funnel pushing member and the bone grafting funnel are coupled together, the bottom end of the first pushing rod extends out of the bottom end opening of the hollow tube, the blunt end of the first pushing rod is used to safely expand the interarticular space, then the bone grafting funnel is sent to the target position, and then the funnel pushing member is withdrawn. Then put the required bone particles into the funnel, and use the bone particle pushing member to push the bone particles out of the bottom end of the hollow tube, and use the flat bottom end of the second pushing rod to compact the bone particles. During the operation, the depth of the pushing rod can be strictly ensured to prevent the distal end from exceeding the bone grafting area at the front end of the funnel during pushing, thereby preventing excessive entry into the interarticular space and avoiding damage caused by misoperation.

[0048] It should be noted that the first pushing rod of the funnel pushing member can also be used to implant bone particles. Since the bottom end of the first pushing rod is blunt, its operation effect is not as good as that of the flat bottom end of the second pushing rod.

[0049] The atlantoaxial bone grafting device provided by the present disclosure at least achieves the following technical effects:

[0050] 1. The bottom end of the hollow tube is designed as a flat blunt shape to adapt to the narrow space of the atlantoaxial lateral mass joint, while being able to safely distract the joint space without damaging important blood vessels and nerve structures. The opening at the bottom end of the hollow tube is designed as a rounded rectangle to match the specific anatomical structure of the atlantoaxial lateral mass joint, ensuring that the bone particles can be accurately placed in the joint space and will not scatter to inappropriate positions.

[0051] 2. The push rod has a depth limiter to ensure that the second push rod is controlled in its depth of advancement when pushing the bone graft material, preventing over-deep pushing that can cause the bone graft material to scatter or damage the surrounding structures of the joint. The design of the second push rod makes the bone graft operation more accurate, with the bone particles evenly distributed and closely embedded through one-time advancement, effectively improving the postoperative fusion rate.

[0052] 3. The design of the bone graft funnel avoids problems such as tearing of the venous plexus and bleeding, and undesirable placement of bone particles that can occur when using forceps to gradually graft bone in traditional surgery. The atlantoaxial bone graft device of the present disclosure can safely distract the lateral mass joint, reduce damage to surrounding blood vessels and nerves, and reduce the difficulty and risk of bleeding during surgery. By accurately placing the bone particles, the bone graft material is more closely and evenly distributed, thereby improving the success rate of postoperative bone fusion and enhancing long-term atlantoaxial stability. Since the bone particles are accurately placed and will not scatter into the spinal canal or vertebral artery hole, the risk of compression of the spinal cord and vertebral artery is significantly reduced, effectively preventing the occurrence of postoperative complications.

[0053] The above description is only the preferred embodiments of the present disclosure and the explanation of the principles of the technology applied. Those skilled in the art should understand that the scope of the invention involved in the present disclosure is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features can be replaced with similar functional technical features disclosed in the present disclosure (but not limited to) to form technical solutions.

Claims

1. An atlantoaxial bone graft device, characterized in that, include: A bone graft funnel includes a hollow tube and a funnel portion disposed at the top of the hollow tube; A funnel-shaped pusher includes a first push rod and a push portion disposed at the top of the first push rod; wherein the first push rod can be placed inside the hollow tube, and when the push portion is located above the top opening of the hollow tube, the bottom end of the first push rod extends out of the bottom opening of the hollow tube; the bottom end of the first push rod is a flat, blunt end.

2. The atlantoaxial bone graft device according to claim 1, characterized in that, The pushing part includes an arc-shaped body adapted to the inner arc surface of the funnel part and a first gripping part disposed on the arc-shaped body.

3. The atlantoaxial bone graft device according to claim 2, characterized in that, The arc-shaped body is a lower hemisphere; the first gripping part is an upper hemisphere adapted to the outer arc surface of the funnel part.

4. The atlantoaxial bone graft device according to claim 1, characterized in that, Also includes: Bone particle delivery component.

5. The atlantoaxial bone graft device according to claim 4, characterized in that, The bone particle pusher includes a second push rod and a second gripping portion disposed at the top end of the second push rod; wherein, the second push rod can be placed inside the hollow tube, and when the second gripping portion is located above the top opening of the hollow tube, the bottom end of the second push rod extends out of the bottom opening of the hollow tube; the bottom surface of the second push rod is flat.

6. The atlantoaxial bone graft device according to claim 5, characterized in that, The second push rod is provided with a depth limiting component, the maximum outer diameter of which is greater than the inner diameter of the top opening of the hollow tube.

7. The atlantoaxial bone graft device according to claim 5, characterized in that, The second gripping part is a sphere.

8. The atlantoaxial bone graft device according to any one of claims 1-7, characterized in that, The top opening of the hollow tube is circular; and / or, the bottom opening of the hollow tube is rounded rectangle.

Images