CN216257356U - Percutaneous minimally invasive support bone grafting device - Google Patents

Abstract

The utility model provides a percutaneous minimally invasive supporting bone grafting device, which comprises a bracket for supporting a vertebral body and a minimally invasive bone grafting device matched with the bracket; the support comprises a central screw rod and a plurality of push plates, the push plates are respectively and symmetrically arranged on the central screw rod through a plurality of connecting assemblies in a movable mode, the connecting assemblies are movably connected with the push plates, and the central screw rod is sleeved with a sliding block and a nut which drives the sliding block to move along the axial direction of the central screw rod; the minimally invasive bone grafting device comprises an auxiliary tube, wherein one end of the auxiliary tube is detachably connected to the central screw rod; the auxiliary tube is provided with an inclined channel, a bone grafting tube is arranged in the inclined channel, and a bone pushing rod is arranged in the bone grafting tube; a central positioning rod is arranged in the pipe of the auxiliary pipe, a plug is arranged on one end face of the central positioning rod, and a jack matched with the plug is arranged in the middle of the end face of the central screw rod.

Description

Percutaneous minimally invasive support bone grafting device

Technical Field

The utility model relates to the technical field of minimally invasive supporting bone grafting, in particular to a percutaneous minimally invasive supporting bone grafting device.

Background

The thoracolumbar vertebral compression fracture is a common spinal injury in clinic, a patient with low injury degree can be treated conservatively, acute back pain can be relieved by traditional conservative treatments such as bed rest and symptomatic pain relief, but later-stage vertebral body kyphosis can cause functional disorders such as reduction of the volume of the thoracoabdominal cavity and limited activity, even normal position can not be maintained, the life quality of the patient is seriously affected, and surgical treatment is often the best choice. The main purpose of the thoracolumbar section compression fracture operation treatment is to restore the height of the vertebral body and the stability of the spine to the maximum extent, reduce the generation of cavities, well relieve pain, restore the function of the spine and improve the quality of life.

In the operation treatment of the compression fracture, a minimally invasive or open reduction technology can be selected, the minimally invasive operation treatment can be clinically adopted for patients without nerve compression symptoms, the minimally invasive operation treatment comprises Percutaneous Vertebroplasty (PVP) and Percutaneous Kyphoplasty (PKP), and the minimally invasive operation treatment has the advantages of small operation wound, good pain relieving effect, quick postoperative recovery and the like, but has the risk of bone cement leakage, the bone cement leakage can increase the risk of fracture of an adjacent vertebra, even serious consequences such as nerve injury, pulmonary embolism and the like are caused, and the bony union can not be formed; the satisfactory vertebral body height recovery is obtained through axial traction and restoration of ligaments in an open reduction nail rod system internal fixation method, immediate stability can be provided by the nail rod internal fixation, but crushed bone trabeculae cannot be completely recovered, cavities in the vertebral body are easy to form, artificial bones are implanted into the vertebral body to serve as fillers to enhance the supporting effect of a damaged vertebral body, the eggshell effect is avoided, the long-term vertebral body height loss can be effectively prevented, the occurrence of posterior convex deformity is reduced, the occurrence rate of long-term complications is reduced, but the internal fixation needs to be taken out for a second time after fracture healing, and the wound is large.

How to recover the height and the shape of the vertebral body of the compression fracture through the minimally invasive channel and realize good support and reliable bone grafting in the vertebral body is an important technical problem to be solved by the modern minimally invasive spine surgery.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problems in the background technology and provides a bone support which can be uniformly propped open and can be used for bone grafting and has high safety when being implanted into a percutaneous minimally invasive channel and a minimally invasive bone grafting device matched with the bone support so as to meet the requirements in medical minimally invasive surgery.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the percutaneous minimally invasive supporting bone grafting device comprises a bracket for supporting a vertebral body and a minimally invasive bone grafting device matched with the bracket;

the support comprises a central screw rod and a plurality of push plates, the push plates are respectively symmetrically and movably arranged on the central screw rod through a plurality of connecting assemblies, the connecting assemblies are movably connected with the push plates, and the central screw rod is sleeved with a sliding block and a nut for driving the sliding block to move axially along the central screw rod; the connecting assembly comprises a left rocker and a right rocker which are arranged on the inner side surface of the push plate, and a left rivet and a sliding block rivet which are arranged on the central screw rod, wherein one end of the left rocker is connected with the left rivet, and one end of the right rocker is rotationally connected with the sliding block rivet; the other ends of the left rocker and the right rocker are respectively connected with each other in a rotating way through a left rocker rivet and a right rocker rivet, and the middle parts of the left rocker and the right rocker are connected in a cross way through a left rocker rivet and a right rocker rivet;

the minimally invasive bone grafting device comprises an auxiliary tube, wherein one end of the auxiliary tube is detachably connected to the central screw rod; the auxiliary tube is provided with an inclined channel, a bone grafting tube is arranged in the inclined channel, and a bone pushing rod is arranged in the bone grafting tube;

a central positioning rod is arranged in the pipe of the auxiliary pipe, a plug is arranged on one end face of the central positioning rod, and a jack matched with the plug is arranged in the middle of the end face of the central screw rod.

The utility model has the beneficial effects that: in the scheme, the support is supported in the damaged vertebral body, so that the support firstly supports the damaged vertebral body, and then bone particles are filled in a space formed by the support and the vertebral body through the minimally invasive bone grafting device, thereby realizing the integration of reduction of the compressed vertebral body fracture, support and bone grafting and promoting the permanent bone fusion of the bone support and the vertebral body.

The minimally invasive bone grafting device is used for grafting bone through the minimally invasive pedicle channel, and the problems of large open bone grafting wound and fracture risk of the bone grafting channel are solved. The minimally invasive bone grafting device is simple and convenient to operate and simple in structure.

Wherein, the bracket supports the vertebral body and plays roles of supporting, resetting and stabilizing the injured vertebral body.

Furthermore, a preset angle is formed between the central line of the inclined channel and the central line of the auxiliary tube, so that the bone grafting tube can avoid the central screw rod when in use and can be accurately inserted into a cavity formed by the bracket and the inner part of the vertebral body.

Further, the inner diameter of the auxiliary tube is 5-7 mm. The vertebral pedicle is not easy to be punctured.

Furthermore, the inner diameter of the bone grafting tube is 2-3 mm.

Furthermore, one end of the auxiliary pipe is provided with internal threads, and one end of the auxiliary pipe is in threaded connection with the central screw rod.

Furthermore, the cross section of the plug is square and is matched with the jack of the central screw rod.

Furthermore, the auxiliary tube, the bone grafting tube, the bone pushing rod and the central positioning rod are all made of medical metal, so that the minimally invasive bone grafting device has certain strength and toughness.

In addition to the technical problems addressed by the present invention, the technical features constituting the technical solutions, and the advantageous effects brought by the technical features of the technical solutions described above, other technical problems that the present invention can solve, other technical features included in the technical solutions, and advantageous effects brought by the technical features will be described in further detail in the detailed description.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:

fig. 1 is a sectional view of a percutaneous minimally invasive supporting bone grafting device according to the present invention.

Fig. 2 is a schematic structural view of the auxiliary tube.

Fig. 3 is a schematic structural view of a center positioning rod.

Fig. 4 is a structural schematic diagram of the stent.

Fig. 5 is a schematic flow chart of percutaneous minimally invasive bone grafting support. (in the order of A → B → C → D → E → F → G → H, wherein A, compression fracture; B, implantation stent; C, distraction stent; D, retention center positioning rod; E, insertion auxiliary tube; F, insertion bone implantation tube; G, implantation bone grain; H, bone grain implantation in the four gaps of the stent)

Wherein: 1. a vertebral body; 3. a support; 31. a central screw; 32. pushing the plate; 33. a slider; 34. a nut; 35. a connecting assembly; 36. a left rivet; 37. a left rocker; 38. a left rocker rivet; 39. a left rocker rivet and a right rocker rivet; 40. a right rocker rivet; 41. a right rocker; 42. a slider rivet; 5. a central positioning rod; 6. a bone grafting tube; 7. pushing the bone rod; 8. a second channel; 9. an internal thread; 10. a plug; 11. an auxiliary tube.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It is to be understood that the described embodiments are merely a few embodiments of the utility model, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, the present invention provides a percutaneous minimally invasive bone grafting device, which includes a support 3 for supporting a vertebral body 1 and a minimally invasive bone grafting instrument matched with the support 3;

referring to fig. 4, the bracket 3 includes a central screw 31 and a plurality of push plates 32, the push plates 32 are symmetrically and movably disposed on the central screw 31 through a plurality of connecting assemblies 35, the connecting assemblies 35 are movably connected with the push plates 32, and the central screw 31 is sleeved with a sliding block 33 and a nut 34 for driving the sliding block 33 to move axially along the central screw 31; the connecting assembly 35 comprises a left rocker 37 and a right rocker 41 which are arranged on the inner side surface of the push plate 32, and a left rivet 36 and a sliding block rivet 42 which are arranged on the central screw rod 31, wherein one end of the left rocker 37 is connected with the left rivet 36, and one end of the right rocker 41 is rotatably connected with the sliding block rivet 42; the other ends of the left rocker 37 and the right rocker 41 are respectively connected in a rotating way through a left rocker rivet 38 and a right rocker rivet 39, and the middle parts of the left rocker 37 and the right rocker 41 are connected in a crossing way through the left rocker rivet 39 and the right rocker rivet 39. The connecting assembly 35 drives the push plate 32 to fold inwards by taking the central screw 31 as a center, the push plate is implanted into a vertebral body through a percutaneous transpedicular channel, and the bracket is spread by the sliding device, so that the bracket supports the vertebral body, and plays roles of supporting, resetting and stabilizing the injured vertebral body.

Preferably, the push plates 32 and the connecting members 35 are four in number.

Referring to fig. 1 to 3, the minimally invasive bone grafting instrument includes an auxiliary tube 11, one end of the auxiliary tube 11 being detachably connected to a central screw 31; the auxiliary tube 11 is provided with an inclined channel, a bone grafting tube 6 is placed in the inclined channel, and a bone pushing rod 7 is arranged in the bone grafting tube 6; a central positioning channel is arranged in the auxiliary pipe 11, a plug 10 is arranged on one end face of the central positioning rod 5, and a jack matched with the plug 10 is arranged in the middle of the end face of the central screw 31.

In the scheme, the support 3 is supported in the damaged vertebral body 1, so that the support 3 firstly supports the damaged vertebral body 1, and then the space formed by the support 3 and the vertebral body 1 is filled with bone particles through the minimally invasive bone grafting device, thereby realizing the fracture reduction and support, bone grafting and osseous fusion of the compressed vertebral body 1.

The minimally invasive bone grafting device can fill the gap of the bracket 3 with bone particles through the minimally invasive channel, thereby solving the problems of large open bone grafting wound and fracture risk of the bone grafting channel. The minimally invasive bone grafting device is convenient to operate and simple in structure.

After the minimally invasive bone grafting device is matched with the bracket 3, the requirements in medical minimally invasive surgery are met, the operation can be simplified, and the curative effect of the surgery is improved.

The central positioning rod 5 is arranged to play a role in positioning the auxiliary tube 11. One end of the central positioning rod 5 is provided with a plug 10, the plug 10 can be inserted into a jack of the central screw rod 31, the jack is matched with the plug 10 for use, and the auxiliary pipe 11 is conveniently and rapidly inserted into the central screw rod 31.

Preferably, the center line of the inclined channel forms a certain angle with the center line of the auxiliary tube 11, so that the bone grafting tube can avoid the central screw 31 when in use and can be accurately inserted into a cavity formed by the bracket 3 and the inner part of the vertebral body 1.

Preferably, the auxiliary tube 11 has an inner diameter of 5 to 7 mm. The vertebral pedicle is not easy to be punctured.

The inner diameter of the bone grafting tube 6 is preferably 2-3 mm. The bone particles are placed in the bone grafting tube 6, and the bone particles are pushed into a cavity formed by the bracket 3 and the vertebral body 1 through the bone grafting tube 6 by a bone pushing rod 7.

Preferably, one end of the auxiliary tube 11 is provided with an internal thread 9, and one end of the auxiliary tube 11 is threadedly coupled to the central screw 31. The internal thread 9 is arranged as shown in fig. 2, and the internal thread 9 is matched with the central screw rod 31 for use, so that the functions of detachable connection and positioning between the auxiliary pipe 11 and the bracket 3 are realized.

Preferably, the auxiliary tube center positioning rod 5 has a graduation line, so that the angle of the auxiliary tube 11 relative to the bracket 3 can be quickly and accurately adjusted, for example, to 90 °, 180 °, 270 °, 360 ° or the like of the initial state.

Preferably, the auxiliary tube 11, the bone grafting tube 6, the bone pushing rod 7 and the central positioning rod 5 are all made of medical metal, so that the minimally invasive bone grafting device has certain strength and toughness.

The use method of the utility model comprises the following steps:

s1, folding the support 3, placing the folded support in the front center pillar of the damaged vertebral body 1 through the pedicle of vertebral arch channel, and opening the support through a sliding device;

s2, inserting the central positioning rod 5 on the central screw rod 31 for positioning; the auxiliary tube 11 passes through the central positioning rod 5 and is screwed on the central screw rod 31 through the internal thread 9 on the auxiliary tube, so that the inclined passage port is positioned in a cavity formed by the bracket 3 and the vertebral body 1;

s3, taking the central positioning rod 5 off the central screw 31 and taking the central positioning rod out of the auxiliary pipe 11;

s4, the bone grafting tube 6 passes through the inclined channel, so that one end of the bone grafting tube 6 is positioned in a cavity formed by the bracket 3 and the vertebral body 1;

s5, placing bone particles into the bone grafting tube 6 at the other end of the bone grafting tube 6, pushing the bone particles in the bone grafting tube 6 into a cavity formed by the bracket 3 and the vertebral body 1 through the bone pushing rod 7, and filling the cavity;

s6, taking out the bone grafting tube 6 and the bone pushing rod 7, inserting the central positioning rod 5 on the central screw rod 31, rotating the auxiliary tube 11 according to the central positioning rod 5 to enable the inclined channel port to be positioned in the next cavity, and repeating the steps S3-S5;

specifically, the bracket 3 and the vertebral body 1 form four equal cavities; the auxiliary tube 11 is rotated 90 each time with the inclined passage opening at the cavity.

S7, repeating the steps S2-S6 to make the bone particles fill all the cavities formed by the bracket 3 and the vertebral body 1.

In summary, the following steps: the minimally invasive bone grafting device has compact structure and realizes the functions of directional bone grafting and positioning in a very small space. The support 3 is supported in the centrum 1 through the percutaneous minimally invasive channel, and the support 3 and the minimally invasive bone grafting device are matched to recover the damaged centrum 1, so that the problems of vertebral restoration and bone grafting caused by tiny wound are solved, and the problems of large open bone grafting wound and fracture risk of a bone grafting channel are solved.

The final stability of fracture mainly lies in realizing the bony union, can plant the bone in central screw 31 and between push pedal 32 in implanting centrum 1, furthest struts the clearance, for the healing creation condition of injured vertebra, furthest realizes the normal form healing of injured vertebra, the rotatable direction of adjustment of wicresoft bone grafting ware, realize four directions at the spiral process and evenly plant the bone, can compress centrum 1 and realize that the fracture resets and provide even packing, adjust easy and simple to handle, the instrument is simple, the problem that the wicresoft bone grafting ware received the bone grafting passageway restriction, can only send the bone to one direction has been solved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (6)

1. A percutaneous minimally invasive supporting bone grafting device is characterized by comprising a bracket (3) and a minimally invasive bone grafting device matched with the bracket (3);

the support (3) comprises a central screw rod (31) and a plurality of push plates (32), the push plates (32) are symmetrically and movably arranged on the central screw rod (31) through a plurality of connecting assemblies (35), the connecting assemblies (35) are movably connected with the push plates (32), and the central screw rod (31) is sleeved with a sliding block (33) and a nut (34) which drives the sliding block (33) to axially move along the central screw rod (31); the connecting assembly (35) drives the push plate (32) to fold inwards by taking the central screw rod (31) as a center, and the push plate is implanted into the vertebral body (1) through a percutaneous transpedicular channel, and the connecting assembly (35) drives the push plate (32) to spread outwards by taking the central screw rod (31) as a center, so that the support (3) is opened to support the vertebral body (1);

the connecting assembly (35) comprises a left rocker (37) and a right rocker (41) which are arranged on the inner side surface of the push plate (32), and a left rivet (36) and a sliding block rivet (42) which are arranged on the central screw rod (31), one end of the left rocker (37) is connected with the left rivet (36), and one end of the right rocker (41) is rotatably connected with the sliding block rivet (42); the other ends of the left rocker (37) and the right rocker (41) are respectively connected in a rotating manner through a left rocker rivet (38) and a right rocker rivet (39), and the middle parts of the left rocker (37) and the right rocker (41) are connected in a cross manner through the left rocker rivet (39) and the right rocker rivet (39);

the minimally invasive bone grafting device comprises an auxiliary tube (11), wherein one end of the auxiliary tube (11) is detachably connected to a central screw rod (31); an inclined channel is formed in the auxiliary tube (11), a bone grafting tube (6) is placed in the inclined channel, and a bone pushing rod (7) is arranged in the bone grafting tube (6);

the auxiliary pipe is characterized in that a central positioning channel is arranged in the auxiliary pipe (11), a central positioning rod (5) is placed in the central positioning channel, a plug (10) is arranged on one side end face of the central positioning rod (5), and a jack matched with the plug (10) is arranged on the end face of the central screw rod (31).

2. The percutaneous minimally invasive support bone grafting device according to claim 1, wherein a preset angle is formed between the central line of the inclined channel and the central line of the auxiliary tube (11).

3. A percutaneous minimally invasive support bone grafting device according to claim 2, characterized in that the inner diameter of the auxiliary tube (11) is 5-7 mm.

4. A percutaneous minimally invasive supporting bone grafting device according to claim 3, characterized in that the inner diameter of the bone grafting tube (6) is 2-3 mm.

5. The percutaneous minimally invasive support bone grafting device according to claim 4, wherein one end of the auxiliary tube (11) is connected to the central screw (31) through internal threads on the auxiliary tube.

6. The percutaneous minimally invasive support bone grafting device according to claim 5, wherein the cross section of the plug (10) is square.

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