Microporous bone cement pedicle screw

Abstract

The utility model relates to a micropore bone cement pedicle screw which comprises a screw body and a screw tail. An injection channel used for injecting bone cement is formed in the nail body, a plurality of micropores used for dispersing the bone cement are distributed in the nail body on the side face of the injection channel, and the micropores are distributed in the front half portion of the injection channel. And the aperture of the micropores is less than 0.5 mm. Bone cement can be injected into the screw through the axial channel, and uniformly seeps and diffuses into surrounding bone tissues through the micropores, so that diffuse seepage of the bone cement is ensured, the perfusion pressure is reduced, a stable bone cement-bone interface is formed, and the fixing effect of the screw is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of medical equipment, concretely relates to a microporous bone cement pedicle screw. BACKGROUND

[0002] With the aggravation of the society aging, the incidence of osteoporosis is increasing year by year, and it has become one of the most important reasons affecting the quality of life of the elderly. Osteoporosis patients have reduced bone mineral content and damaged trabeculae, and increased bone fragility. Therefore, when using traditional pedicle screws for internal fixation of the spine, it cannot provide enough holding force, resulting in internal fixation failure. For this reason, bone cement screws are often used for internal fixation surgery of the spine of osteoporosis patients. The bone cement screw is designed with a bone cement outflow channel in the screw based on the ordinary screw, and the outflow channel injects bone cement (usually polymethyl methacrylate, PMMA) into the vertebral body, so that it is dispersed in the intertrabecular space of the vertebral body, forming a bone cement pedicle screw-cement-vertebral body complex, thereby improving the fixation strength of the screw and reducing the risk of postoperative screw loosening. However, it is found that there is an incidence of 0.6%-35% of bone cement leakage during the use of bone cement screws. Bone cement leakage can cause tissue inflammation, nerve or blood vessel damage, and even life-threatening pulmonary embolism in severe cases.

[0003] Research has found that the design of the side hole of the bone cement screw is closely related to the occurrence of bone cement leakage. The side hole of the bone cement screw is used as an outflow channel for the dispersion of bone cement from the bone cement screw into the vertebral body. The exudation of bone cement can effectively increase the fixation force of the screw between the vertebral bodies and reduce the risk of screw extraction. The design of the side hole can affect the injection pressure of the bone cement, and the position and number of the hole can change the flow path and distribution of the bone cement. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide a microporous bone cement pedicle screw to solve the technical problem that the current bone cement pedicle screw is prone to bone cement leakage during use, thereby causing tissue inflammation, nerve or blood vessel damage.

[0005] The utility model solves the technical problem by adopting the following technical scheme:

[0006] A microporous bone cement pedicle screw is provided, which comprises

[0007] A nail body and a nail tail; an injection channel for injecting bone cement is formed in the nail body, a plurality of micropores for dispersing bone cement are distributed on the side of the nail body of the injection channel, and each micropore is distributed in the front half of the injection channel; the pore diameter of each micropore on the nail body is less than 0.5mm.

[0008] Further, the pore diameter of each micropore on the nail body is larger at the distal end and smaller at the proximal end.

[0009] Further, the injection channel aperture is 2mm.

[0010] Further, the nail body front end is provided with a guide groove.

[0011] Further, each micro hole is distributed in the thread groove of the nail body outer thread.

[0012] The beneficial effects of the present application are:

[0013] The present application provides a micro hole bone cement pedicle screw, bone cement can be injected into the screw through the axial channel, and evenly seep through the plurality of micro holes, diffuse into the surrounding bone tissue, ensure the diffuse seepage of bone cement, reduce the perfusion pressure, form a stable bone cement-bone interface, and enhance the fixing effect of the screw. BRIEF DESCRIPTION OF DRAWINGS

[0014] The present application will be further described below in conjunction with the drawings.

[0015] Figure 1 is the perspective view of the micro hole bone cement pedicle screw of the present application;

[0016] Figure 2 is the half cut view of the micro hole bone cement pedicle screw of the present application;

[0017] 1, nail tail, 11, internal thread;

[0018] 2, nail body, 21, injection channel, 22, micro hole, 23, external thread;

[0019] 3, guide groove. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0021] The present application provides a micro hole bone cement pedicle screw, which will be described in detail below. It should be noted that the description order of the following embodiments is not limited as the preferred order of the embodiments of the present application. Moreover, the description of each embodiment in the following embodiments has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0022] To solve the technical problem that the bone cement pedicle screw in the prior art is prone to bone cement leakage in use, thereby causing tissue inflammation, nerve or blood vessel damage, an embodiment of the present application provides a microporous bone cement pedicle screw. Details are described below.

[0023] As shown in Figure 1 and Figure 2 , a microporous bone cement pedicle screw comprises

[0024] a shank 2 and a shank tail 1; the shank tail 1 is internally provided with internal threads, and the shank 2 is externally provided with external threads.

[0025] The shank 2 is internally provided with an injection channel 21 for injecting bone cement, and a plurality of micropores 22 for dispersing bone cement are distributed on the side of the shank 2 of the injection channel 21; each micropore 22 is distributed in the front half of the injection channel 21; the aperture of each micropore 22 is less than 0.5 mm.

[0026] The micropores 22 have small apertures and high density, and are distributed on the surface of the screw.

[0027] Specifically, as an optional implementation manner in the embodiment, as shown in Figure 1 and Figure 2 , the apertures of the micropores 22 on the shank 2 are large at the distal end and small at the proximal end.

[0028] Specifically, as an optional implementation manner in the embodiment, as shown in Figure 1 and Figure 2 , the aperture of the injection channel 21 is 2 mm.

[0029] In the embodiment, a guide groove is formed at the front end of the shank 2. The guide groove facilitates the screw to be driven into the bone.

[0030] In the embodiment, each micropore 22 is distributed in a thread groove of the external threads.

[0031] The microporous bone cement pedicle screw of the embodiment: the micropores 22 have small sizes but large quantity, so the total area is large; the pressure difference of each micropore 22 is reduced, and the uniformity of bone cement dispersion is improved; compared with large holes, the strength of the screw is improved; the total area is large, the bone cement injection force is reduced, the operability of the bone cement is improved, and the safety is improved

[0032] The use method of the microporous bone cement pedicle screw of the embodiment is as follows:

[0033] 1. The internal threads in the shank tail 1 are connected with a bone cement injection push rod;

[0034] 2. The inner diameter of the bone cement injection push rod matches the hollow bone cement injection channel 21 in the shank 2, and the bone cement is injected into the microporous pedicle screw through the hollow bone cement injection channel 21.

[0035] 3. The micro holes 22 are connected with the bone cement injection channel 21, and the bone cement is diffused into the vertebral body around the micro hole bone cement screw through the micro holes 22.

[0036] Each device (parts not specifically described) selected in the present application is a general standard part or a part known to those skilled in the art, and its structure and principle can be known to those skilled in the art through a technical manual or through a conventional experimental method.

[0037] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In the description of the present application, it should be pointed out that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0039] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, and for example, a plurality of units or components can be combined or integrated into another system, or some features can be omitted or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed each other can be through some communication interface, indirect coupling or communication connection between devices or units, which can be electrical, mechanical or other forms.

[0040] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or they can be distributed on a plurality of network units. According to actual needs, part or all of the units can be selected to achieve the purpose of the present embodiment scheme.

[0041] In addition, each functional unit in each of the embodiments of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit.

[0042] Based on the above ideal embodiments of the present application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A microporous bone cement pedicle screw, characterized by, Comprising a shank (2) and a shank tail (1); a injection channel (21) for injecting bone cement is set in the shank (2), a plurality of micro-holes (22) for dispersing bone cement are distributed on the side of the shank (2) of the injection channel (21), each micro-hole (22) is distributed in the front half of the injection channel (21); the aperture of each micro-hole (22) is less than 0.5mm.

2. The micro-hole bone cement pedicle screw according to claim 1, characterized in that, the aperture of each micro-hole (22) on the shank (2) is larger at the distal end and smaller at the proximal end.

3. The micro-hole bone cement pedicle screw according to claim 1, characterized in that, the aperture of the injection channel (21) is 2mm.

4. The micro-hole bone cement pedicle screw according to claim 1, characterized in that, a guide slot (3) is set at the front end of the shank (2).

5. The micro-hole bone cement pedicle screw according to claim 1, characterized in that, each micro-hole (22) is distributed in the thread groove of the external thread (23) of the shank (2).

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