A bone cement controllable release device for spinal fractures

Abstract

The present invention provides a device for controlled release of bone cement for spinal fractures, belonging to the technical field of controlled release of bone cement. It comprises a syringe threaded connection hose, the hose is connected to an injection needle, the inner cavity of the injection needle is sleeved with an inner injection needle assembly, the inner injection needle assembly is adapted to a plug assembly; a rebound assembly is arranged on the side of the injection needle body close to the hose, and an upper fixing ring in the rebound assembly is adapted to a lower fixing ring. The present invention installs an inner injection needle in the inner sleeve of the injection needle, and grooves are provided on the outer wall and the inner wall of the inner injection needle, and a plug assembly is installed in the groove, so that the doctor can control the dosage of the first injection, reduce the difficulty and duration of the first injection of bone cement, and improve the efficiency of the injection; because the plug plays a protective role, the blood and blood clots brought into the inner cavity of the needle are reduced, and the risk of bone cement entering the blood and surgical complications are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bone cement controlled release, and in particular to a bone cement controlled release device for spinal fractures. Background Art

[0002] Bone cement is a material widely used in orthopedic surgery. It is mainly used to fill bone defects and bond bone tissue after spinal fractures. It stabilizes the vertebral body, reduces pain, and disperses stress. It plays an important role in the treatment of spinal fractures and bone defects.

[0003] Bone cement is first mixed into a fluid state before the injection operation. At present, bone cement injection usually adopts X-ray fluoroscopy and blind puncture injection methods. The doctor first blindly punctures the needle and observes the needle position through X-ray fluoroscopy. After the needle position is locked, the bone cement is stirred and mixed. The syringe inhales the bone cement medium and discharges the air from the syringe. At this time, the syringe is connected to a hose, and the hose is connected to the injection needle of the patient's body for bone cement injection. During the operation, the doctor cannot accurately judge the amount of bone cement injected in the vertebral body. He can only judge whether the bone cement has flowed out based on experience combined with X-ray fluoroscopy. Usually during the bone cement injection process, the doctor needs to observe and confirm repeatedly under X-ray fluoroscopy, thereby increasing the operation time and surgical risk. And if the bone cement leaks into the spinal canal or leaks into the blood, it will cause serious complications in the patient, anaphylactic shock, and even death. Therefore, there is currently a lack of a bone cement controllable release injection device to reduce the occurrence of the above complications. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a controllable release device for bone cement of spinal fractures, so as to solve the problems of existing bone cement injection, such as high operation intensity, low injection efficiency, uncontrollable first injection amount, and uneven injection distribution.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A controllable release device for bone cement of spinal fractures comprises a syringe threaded connection hose, the hose is connected to an injection needle, an inner injection needle assembly is sleeved in the inner cavity of the injection needle, and the inner injection needle assembly is adapted to a plug assembly; a rebound assembly is arranged on the side of the injection needle body close to the hose, and an upper fixing ring in the rebound assembly is adapted to a lower fixing ring.

[0007] Optionally, the inner injection needle assembly further comprises a plurality of circular perforations arranged on the top beveled surface of the inner injection needle body, the circular perforations being connected to the outer wall groove, and an outward expansion groove is arranged on one side of the outer wall groove close to the circular perforations.

[0008] Optionally, an inner wall groove is provided on the inner wall of the inner injection needle at a position corresponding to the outer wall groove.

[0009] Optionally, the plug assembly also includes a plug line with one end connected to a plurality of plugs and the other end connected to a fixing ring.

[0010] Optionally, there are two plug assemblies, and the plug, the plug wire and the fixing ring in each of the plug assemblies are adapted to the outer wall groove and the inner wall groove provided on the inner injection needle body.

[0011] Optionally, the plugs are respectively adapted to be installed on the upper surface and the lower surface of the circular perforation.

[0012] Optionally, the upper fixing ring and the lower fixing ring in the rebound assembly are respectively sleeved outside the inner injection needle, and the upper fixing ring is away from the lower fixing ring.

[0013] Optionally, a fixing block is provided on the upper surface of the lower inner cavity in the lower fixing ring, and the fixing block is located between the lower inner cavity and the inner wall of the inner injection needle; and the lower fixing inner ring is threadedly connected to the inner injection needle.

[0014] Optionally, a fixing block groove is provided on the upper surface of the upper inner cavity in the upper fixing ring, and the fixing block groove is located between the upper inner cavity and the inner wall of the inner injection needle; the upper fixing ring fixes the inner injection needle via an internal thread.

[0015] Optionally, the fixing block is adapted to the fixing block groove, and the fixing block can slide in the fixing block groove.

[0016] Optionally, the lower inner cavity in the lower fixing ring is adapted to the upper inner cavity in the upper fixing ring, and the inner cavity height of the upper inner cavity is greater than the inner cavity height of the lower inner cavity.

[0017] Optionally, the fixing block is a 7-shaped body, the fixing block body is provided with a fixing groove, and the fixing groove is adapted to fit a fixing ring for fixing two plug assemblies.

[0018] Optionally, the plug has a hollow inner cavity.

[0019] Optionally, an injection needle body is arranged on a side of the injection needle away from the rebound component, and an injection needle handle is fixedly arranged on the top of the injection needle body.

[0020] Optionally, the injection needle is divided into two sections, one section is fixed to the upper fixing ring, and the other section is fixed to the lower fixing ring.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] In the above scheme, an inner injection needle is installed in the inner sleeve of the injection needle, grooves are provided on the outer wall and the inner wall of the inner injection needle, and a plug assembly is installed in the groove, so that the doctor can control the dosage during the first injection, reduce the difficulty and duration of the first injection of bone cement, and improve the efficiency of the injection.

[0023] In the above scheme, grooves are provided on the outer wall and the inner wall of the inner injection needle, and a plug assembly is installed in the groove. The doctor can control the dosage during the first injection. Due to the obstruction of the plug, the doctor feels a certain resistance when pushing the syringe, and thus the doctor does not need to calculate the amount of bone cement in the hose and the injection needle, thereby improving the efficiency of the injection and eliminating the need for frequent CT fluoroscopy observations.

[0024] By designing the needle of the internal injection needle, the needle is designed with several circular perforations; compared with the traditional needle, the amount of fluid bone cement pushed out is controllable in direction and the injection distribution is uniform. The traditional bone cement injection method is to rotate the syringe to push the bone cement out of the needle, and design several circular perforations to limit the speed and amount of bone cement outflow, and then spray the bone cement out by rotating the syringe, so as to achieve uniform injection distribution and controllable injection direction. The use of this internal injection needle can greatly reduce costs, and replace the rotary syringe with an ordinary injection-push syringe. The bone cement sprayed out is more evenly distributed and has a better injection direction.

[0025] A fixed block is set through the lower inner cavity of the lower fixed ring, and the fixed ring in the plug assembly is installed on the fixed block. When the doctor pulls up the lower fixed ring, the fixed block in the lower fixed ring moves up to drive the plug assembly to move up, and then pulls open the plug in the plug assembly, which facilitates subsequent injection work and improves injection efficiency.

[0026] The plug in the plug assembly is a hollow body made of thin plastic. When the doctor pulls up the lower fixing ring, the lower fixing ring drives the plug assembly to move upward as a whole. The plug moves upward as a whole to the outer expansion groove and the inner expansion groove and stops moving upward. At the same time, the lower fixing ring adapts to the upper fixing ring. The lower fixing ring is slightly rotated so that its fixing block is stuck in the fixing block groove in the upper fixing ring, which does not affect the injection of bone cement. The operation is simple and convenient.

[0027] By arranging an outer wall groove and an inner wall groove on the outer wall and the inner wall of the inner injection needle, an outward-expanding groove and an inner wall groove are respectively arranged at corresponding positions on one side of the outer wall groove and the inner wall groove close to the circular perforation, and the pull-up plugs are respectively accommodated in the outer wall groove and the inner wall groove, so that the bone cement injection operation is convenient and the injection efficiency is improved.

[0028] By installing plugs on the outer surface and inner surface of the needle of the internal injection needle respectively, when the doctor injects bone cement into the hose and needle for the first time, the bone cement can be prevented from flowing out, thereby improving the sealing and controllability of the dosage, reducing the operating intensity, improving the efficiency of the injection, and reducing the number of times the doctor observes CT fluoroscopy; because the plug plays a protective role, the blood and blood clots brought into the inner cavity of the needle are reduced, thereby reducing the risk of bone cement entering the blood and surgical complications. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable those skilled in the relevant art to make and use the invention.

[0030] Figure 1 It is a schematic diagram of the three-dimensional structure of a bone cement controlled release device for spinal fractures;

[0031] Figure 2 It is a schematic diagram of the structure of the injection needle and the rebound component;

[0032] Figure 3 It is a schematic diagram of the injection needle and the internal injection needle structure;

[0033] Figure 4 Schematic diagram of a circular perforation structure for adapting the plug to the inner injection needle;

[0034] Figure 5 is a schematic diagram of the structure of the internal injection needle;

[0035] Figure 6 A schematic diagram of the structure of an inner injection needle adapter plug;

[0036] Figure 7 It is a schematic diagram of the plug structure;

[0037] Figure 8 It is a schematic diagram of the cross-sectional structure of the plug;

[0038] Fig. 9 Schematic diagram of the internal injection needle structure;

[0039] Fig.10 It is a schematic diagram of the structure of the rebound component;

[0040] Fig.11 It is a schematic diagram of the structure of the lower fixing ring and the upper fixing ring;

[0041] Fig.12 Schematic diagram of the structure of the lower fixing ring;

[0042] Fig.13 Schematic diagram of the upper fixing ring structure;

[0043] Fig.14 This is a schematic diagram of the fixed block structure.

[0044] [Reference Signs]

[0045] 1. Syringe; 2. Hose; 3. Injection needle; 4. Rebound assembly; 5. Inner injection needle; 6. Plug; 7. Upper fixing ring; 8. Lower fixing ring; 9. Spring; 310. Injection needle body; 320. Injection needle grip; 510. Outer wall groove; 511. Circular perforation; 513. Outward expansion groove; 514. Inner wall groove; 610. Plug line; 611. Fixing ring; 612. Hollow body; 710. Upper inner cavity; 711. Fixing block groove; 712. Internal thread; 810. Lower inner cavity; 811. Fixing block; 812. Fixing groove.

[0046] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0047] The following is a detailed description of a spinal fracture bone cement controllable release device provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0048] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0049] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0050] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0051] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0052] like Figures 1 to 14 As shown, an embodiment of the present invention provides a controllable release device for bone cement of spinal fracture, comprising a syringe 1 threadedly connected to a hose 2, the hose 2 connected to an injection needle 3, an inner injection needle assembly sleeved in the inner cavity of the injection needle 3, and the inner injection needle assembly adapted to a plug assembly; a rebound assembly 4 is arranged on the side of the injection needle 3 body close to the hose 2, and an upper fixing ring 7 in the rebound assembly 4 is adapted to a lower fixing ring 8. The syringe 1 is an existing special bone cement syringe, which is a rotary or injection-push type for pushing bone cement, the syringe is threadedly connected to a hose, and the hose can be deformed to facilitate the connection between the syringe and the injection needle. The attending physician inserts the injection needle into the patient's lesion through blind puncture and CT fluoroscopic observation, and after the injection needle is fixed in position, the doctor mixes and stirs the bone cement, and after the bone cement is mixed to a wet sand form, the syringe inhales the wet sand form bone cement and discharges the air inside the syringe, at which time the syringe is threadedly connected to one end of the hose, and the other end is threadedly connected to the injection needle.

[0053] A rebound component 4 is arranged on the injection needle 3 body, an upper fixing ring 7 and a lower fixing ring 8 are arranged in the rebound component 4, the upper fixing ring 7 is adapted to the lower fixing ring 8, a fixing block 811 is arranged in the lower fixing ring 8, a fixing groove 812 is arranged on the fixing block 811 body, the fixing groove 812 is adapted to the fixed plug component, the plug component is adapted to the circular perforation 511 arranged on the top inclined surface of the inner injection needle 5, by arranging the plug component, the doctor can control the amount of bone cement injected into the hose and the injection needle for the first time, because the plug blocks the injection of the syringe and is subject to slight resistance; the traditional injection amount is very small, only 0.2-0.3ml, so the doctor's injection speed is slow and can feel slight resistance, and then the doctor does not need to calculate the amount of bone cement in the hose and the injection needle, thereby improving the injection efficiency and reducing the difficulty and duration of the first injection of bone cement; because the plug component plays a protective role, the blood and blood clots brought into the inner cavity during needle puncture are reduced, and the injection risk and complications are reduced.

[0054] like Figure 2 As shown, the injection needle 3 is provided with an injection needle body 310 on the side away from the rebound component 4, and the injection needle grip 320 is fixedly provided on the top of the injection needle body 310. The injection needle 3 is an existing product and will not be described in detail here. The attending physician places his palm against the injection needle grip 320, holds the injection needle body 310 with his index finger and middle finger, and slowly implants the injection needle tip into the patient's lesion. The rebound component 4 is provided below the injection needle body 310 to facilitate the doctor's operation of the rebound component.

[0055] like Figures 3 to 5 and Fig. 9As shown, the inner injection needle assembly also includes a plurality of circular perforations 511 arranged on the top beveled surface of the inner injection needle 5 body, the circular perforations 511 are connected to the outer wall groove 510, and an outward expansion groove 513 is arranged on the side of the outer wall groove 510 close to the circular perforations 511; an inner wall groove 514 is arranged on the inner wall of the inner injection needle 5 at a position corresponding to the outer wall groove 510. The inner injection needle 5 is equipped with the inner injection needle 3, the injection needle 3 is a lesion puncture needle, and the inner injection needle 5 is a bone cement injection needle; the top beveled surface of the inner injection needle 5 body is a solid body, and a plurality of circular perforations 511 are arranged on the solid body, and the circular perforations 511 are arranged in a staggered arrangement, and the staggered arrangement design facilitates the doctor to pull out the plug and prevents the plug from accumulating. An outer wall groove 510 is provided at the lower edge of the top beveled surface of the inner injection needle 5 body, and a plug line 610 is adapted in the outer wall groove 510. An outwardly expanding groove 513 is provided on the side of the outer wall groove 510 close to the circular perforation 511, and the outwardly expanding groove 513 is connected with the outer wall groove 510, and both are adapted to place the plug assembly; and the inner diameter width of the outwardly expanding groove 513 is greater than that of the outer wall groove 510. Such an inner diameter design is convenient for pulling up the plug assembly and storing multiple plugs in the outwardly expanding groove. The above paragraph has described that bone cement is in the form of wet sand, and the best injection form of bone cement is the wire drawing form. The wire drawing form is similar to the state of soft toothpaste and also has a certain fluidity. When the doctor pulls up the plug assembly, it is not impossible to pull it up; when the doctor fills the inner cavity of the hose and the injection needle with bone cement for the first time, the plug assembly is pulled up, and the plug assembly slides up along the outer wall groove and the inner wall groove, and finally slides the plug assembly up to the outwardly expanding groove and the inner wall groove.

[0056] By providing grooves on the outer and inner walls of the inner injection needle, and fitting the plug assembly in the groove, the doctor can control the dosage during the first injection. Since the plug blocks the syringe, the syringe is subject to slight resistance, so the doctor does not need to calculate the amount of bone cement in the hose and the injection needle, and the dosage for the next injection can be precisely controlled. The needle is designed with several circular perforations, which can firstly limit the speed and amount of bone cement outflow, and secondly, eject the bone cement through the syringe, so as to achieve uniform injection and controllable ejection direction, greatly reducing the outflow of bone cement.

[0057] like Figure 4 and Figures 6 to 8As shown, the plug assembly also includes a plug line 610 with one end connected to a plurality of plugs 6, and the other end connected to a fixing ring 611; there are two plug assemblies, and the plugs in the two plug assemblies are independent of each other after being adapted and installed, and there is a certain gap between the outer plug and the inner plug to prevent the outer plug from contacting the inner plug. When the inner plug is under pressure, the top surface of the plug of its hollow body is concave, and the bottom surface of the plug will not be concave, further improving the sealing of the plug. The plug 6, plug line 610 and fixing ring 611 in each plug assembly are adapted to the outer wall groove 510 and the inner wall groove 514 set on the body of the inner injection needle 5; the plug 6 is adapted to be installed on the upper surface and the lower surface of the circular perforation 511 respectively; the plug 6 has a hollow body 612 as the inner cavity.

[0058] In the present embodiment, two plug assemblies are used, and the two plug assemblies are respectively adapted to be installed in the outer wall groove and the inner wall groove of the inner injection needle 5 body. There are 7 plugs in the plug assembly, which is the same as and adapted to the number of circular perforations in the inner injection needle 5. The plug 6 is a small bowl-shaped body, and its inner cavity is a hollow body. It is designed as a hollow body, and its body shape is deformed to reduce space, which makes it convenient for the plug to be pulled out of the circular perforation. A channel is set on one side wall of the circular perforation, which makes it convenient for the plug to be pulled out along the channel. The staggered arrangement of the plugs is adapted to the arrangement of the circular perforations 511. With this staggered arrangement, each plug can be distributed separately and in a straight line when pulled out, which reduces the side by side and stacking of the plugs and makes it easier to pull them up. Each plug is individually connected to a plug wire 610, and the tail end of the plug wire 610 is connected to a fixing ring 611. By pulling the fixing ring, the plug wire and the plug are displaced, so that the plug can be pulled out of the circular perforation and pulled into the outward expansion groove and the inner expansion groove from the channel; the fixing ring and the plug wire are made of thinned plastic material without telescopic properties, and the plug is thinned to be a deformable plastic material. The plug assembly is adapted to the circular perforation 511 set on the top inclined surface of the inner injection needle 5. By setting the plug assembly, the doctor can control the dosage during the first injection. Due to the blocking of the plug, the doctor can feel the slight resistance of the syringe, and then the doctor does not need to calculate the amount of bone cement in the hose and the injection needle, which improves the efficiency of the injection and reduces the difficulty and duration of the first injection of bone cement. Two plug assemblies are used, and the outer plug protects the injection needle from blind penetration, bringing blood and blood clots into the inner cavity of the injection needle, reducing the risk of bone cement entering the blood and surgical complications.

[0059] like Figures 10 to 14As shown, the upper fixing ring 7 and the lower fixing ring 8 in the resilient assembly 4 are respectively mounted on the outside of the inner injection needle 5; the injection needle 3 is divided into two sections, one of which is fixed to the upper fixing ring 7 and the other is fixed to the lower fixing ring 8; the injection needle 3 is divided into two sections, one of which is connected to the upper fixing ring 7 and the other is connected to the lower fixing ring 8. By pulling the lower fixing ring 8, the lower injection needle 3 is driven to move upward and backward, so that the needle tip of the inner injection needle 5 is exposed, which is convenient for injecting bone cement. The lower fixing ring 8 is away from the upper fixing ring 7. This design is to move the lower fixing ring upward so that the needle tip of the inner injection needle 5 is fully exposed, which is convenient for the subsequent further bone cement injection operation.

[0060] The lower fixing ring 8 is connected to the inner injection needle 5 through the inner thread 712, and the upper fixing ring 7 fixes the inner injection needle 5 through the inner thread 712; the two sections of the injection needle are respectively connected to the upper fixing ring and the lower fixing ring through threads, in order to stabilize the injection needle 3 in the puncture patient's lesion site without displacement, and the thread is provided with 2-3 threads, so as to facilitate the withdrawal of the lower fixing ring 8 for lifting and displacement. A fixing block 811 is provided on the upper surface of the lower inner cavity 810 in the lower fixing ring 8, and the fixing block 811 is located between the lower inner cavity 810 and the inner wall of the inner injection needle 5; a fixing block 811 is provided on the upper surface of the lower inner cavity 810 in the lower fixing ring 8, and the fixing block 811 is a 7-shaped body. The use of a 7-shaped fixing block is convenient for lifting and locking, and prevents the lower fixing ring from detaching from the upper fixing ring. A fixing block groove 711 is provided on the upper surface of the upper inner cavity 710 in the upper fixing ring 7, and the fixing block groove 711 is located between the upper inner cavity 710 and the inner wall of the inner injection needle 5; the fixing block 811 is adapted to the fixing block groove 711, and the fixing block 811 can slide in the fixing block groove 711; by providing the fixing block groove 711 in the upper inner cavity 710, the position of the fixing block groove corresponds to the position of the fixing block in the lower fixing ring 8, so that the fixing block is conveniently inserted into the fixing block groove; the lower inner cavity 810 in the lower fixing ring 8 is adapted to the upper inner cavity 710 in the upper fixing ring 7, and the inner cavity height of the upper inner cavity 710 is greater than the inner cavity height of the lower inner cavity 810.

[0061] By pulling up the lower fixing ring, it is adapted to be embedded in the upper fixing ring, so that the fixing block in the lower fixing ring is correspondingly embedded in the fixing block groove, and the lower fixing ring is rotated clockwise, and the lower fixing ring drives the fixing block to move in the fixing block groove. The depth of the fixing block groove is twice that of the upper part of the 7-shaped fixing block body. The limit clamps the lower fixing ring to fall and reset, affecting the injection of bone cement; a fixing groove 812 is set on the fixing block 811 body, and the fixing groove 812 is adapted to the fixing ring 611 for fixing two plug assemblies; a fixing groove is set on the 7-shaped fixing block body, and the fixing groove is adapted to install the fixing ring 611 in the plug assembly. The plug assembly is driven to move upward by pulling up the lower fixing ring to open the plug on the needle head of the inner injection needle. Through the upper and lower linkage, the lower fixing ring is pulled up to make the fixed block set in the lower inner cavity move upward, and the fixed block drives the plug assembly to move upward as a whole, and then the plug in the plug assembly is opened, which is convenient for the doctor's subsequent bone cement injection.

[0062] The working principle of the technical solution provided by the present invention is as follows:

[0063] The attending physician first inserts the injection needle into the patient's lesion through blind puncture and CT fluoroscopy. After the position of the injection needle is fixed, the doctor mixes and stirs the bone cement. After the bone cement is mixed into a wet sand form, the syringe sucks in the wet sand form of bone cement and discharges the air inside the syringe. At this time, the syringe is threadedly connected to one end of the hose and the other end is threadedly connected to the injection needle. The bone cement in the syringe is directly pushed into the hose and the inner injection needle. Since the inner and outer walls of the inner injection needle are both installed with a plug assembly, the doctor feels a certain resistance when injecting due to the obstruction of the plug, and then the doctor does not need to calculate the amount of bone cement in the hose and the injection needle, reducing the doctor's work of only being able to inject 0.2-0.3ml each time and then stop, and frequently watching CT fluoroscopy. Compared with traditional injection efficiency, the present application improves injection efficiency and greatly reduces injection risks and complications. When the doctor feels the resistance of injection, he only needs to observe the CT fluoroscopy once to check whether there is seepage of bone cement. If everything is normal, the doctor rotates the lower fixing ring counterclockwise to withdraw the fixation with the inner injection needle. Since the lower fixing ring and the inner injection needle are fixed by 2-3 threads, it is easy to rotate and withdraw. At this time, the doctor pulls up the lower fixing ring, and the 7-shaped fixing block in the lower fixing ring drives the plug assembly to move up. When the fixing block is in contact with the fixing block groove in the upper fixing ring, the plug assembly is now accommodated in the outward expansion groove and the inward expansion groove in the outer wall and inner wall of the inner injection needle. After the upper surface of the lower fixing ring is in contact with the lower surface of the upper fixing ring, the lower fixing ring is rotated to make the fixing block snap into the fixing block in the upper fixing ring. The groove of the fixed block prevents the lower fixing ring from falling and resetting. The upward movement distance of the lower fixing ring is the same as the exposed distance of the needle tip of the inner injection needle. The upward movement distance of the lower fixing ring can be designed according to user needs. Through the upper and lower linkage of the lower fixing ring and the plug assembly, the doctor can control the amount of the first injection. Due to the blocking of the plug, the doctor feels a slight resistance during the first injection, and then the doctor does not need to calculate the amount of bone cement in the hose and the injection needle, thereby improving the efficiency of the first injection and reducing the difficulty and duration of the first bone cement injection operation; because the plug assembly protects the injection needle from blind penetration and brings blood and blood clots into the inner cavity of the injection needle, the risk of bone cement entering the blood and surgical complications are reduced.

[0064] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0065] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A spinal fracture bone cement controllable release device, characterized in that: It comprises a syringe threaded connection hose, the hose is connected to the injection needle, the inner cavity of the injection needle is sleeved with an inner injection needle assembly, and the inner injection needle assembly is adapted to a plug assembly; A rebound assembly is arranged on one side of the injection needle body close to the hose, and an upper fixing ring in the rebound assembly is adapted to a lower fixing ring; The inner injection needle assembly further comprises a plurality of circular perforations on the chamfered surface at the top of the inner injection needle body, the circular perforations being connected to the outer wall groove, and an outward expansion groove being arranged on one side of the outer wall groove close to the circular perforations; An inner wall groove is provided on the inner wall of the inner injection needle at a position corresponding to the outer wall groove; The plug assembly also includes a plug line with one end connected to a plurality of plugs and the other end connected to a fixing ring; There are two plug assemblies, and the plug, the plug wire and the fixing ring in each of the plug assemblies are adapted to the outer wall groove and the inner wall groove provided on the inner injection needle body; The plugs are respectively adapted to be installed on the upper surface and the lower surface of the circular perforation; The upper fixing ring and the lower fixing ring in the rebound assembly are respectively sleeved outside the inner injection needle, and the upper fixing ring is away from the lower fixing ring; A fixing block is arranged on the upper surface of the lower inner cavity in the lower fixing ring, and the fixing block is located between the lower inner cavity and the inner wall of the inner injection needle; the inner thread of the lower fixing ring is connected to the inner injection needle; A fixing block groove is provided on the upper surface of the upper inner cavity in the upper fixing ring, and the fixing block groove is located between the upper inner cavity and the inner wall of the inner injection needle; the upper fixing ring fixes the inner injection needle via an internal thread; The fixing block is adapted to the fixing block groove, and the fixing block can slide in the fixing block groove.

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