Bone cement injector

Abstract

The present invention discloses a bone cement injector, comprising: a handle and a sleeve, wherein the sleeve is composed of an outer sleeve and an inner sleeve, and the outer sleeve and the inner sleeve both extend in the front-back direction; the inner sleeve is sleeved in the outer sleeve, and a first accommodating cavity for accommodating bone cement is provided in the handle, and the rear ends of the outer sleeve and the inner sleeve both extend into the first accommodating cavity; a plurality of bone cement diffusion openings are provided in a preset area on the outer side of the outer sleeve, and the bone cement diffusion openings penetrate the side wall of the outer sleeve, and the preset area is close to the front end. The bone cement injector can reinforce the channel formed during surgery.

Description

Technical Field

[0001] The invention relates to the technical field of medical instruments, in particular to a bone cement injector. Background Art

[0002] Osteoporotic vertebral compression fracture (OVCF) is a common spinal injury that involves the collapse of one or more vertebrae in the spine. Vertebral compression fractures are generally treated with vertebroplasty (PVP) or kyphoplasty (PKP), which are less invasive and have good analgesic effects. However, these surgeries require the injection of bone filling materials into the affected vertebrae through percutaneous puncture, which can easily cause complications, such as leakage of bone cement (bone filler).

[0003] The patent application (application number: 202021158178.6, name: A bone cement injector) discloses a bone cement injector, in which a guide head is provided, and the guide head can flow out bone cement; when the guide head moves forward, a channel is formed to push the cement. And because of the complexity of the internal structure of the spine, there is a possibility of cracks in the constructed channel, resulting in leakage of bone cement. It is understandable that in order to facilitate the operation, the channel needs to be reinforced. Summary of the invention

[0004] In view of this, the main purpose of the present invention is to provide a bone cement injector.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is implemented as follows: a bone cement injector comprises: a handle and a sleeve, the sleeve is composed of an outer sleeve and an inner sleeve, and the outer sleeve and the inner sleeve both extend in the front-to-back direction; the inner sleeve is sleeved in the outer sleeve, and a first accommodating cavity for accommodating bone cement is provided in the handle, and the rear ends of the outer sleeve and the inner sleeve both extend into the first accommodating cavity; a plurality of bone cement diffusion openings are provided in a preset area on the outer side surface of the outer sleeve, and the bone cement diffusion openings penetrate the side wall of the outer sleeve, and the preset area is close to the front end.

[0006] As an improvement to the embodiment of the present invention, a plurality of bone cement diffusion openings are distributed along the extension direction of the outer sleeve.

[0007] As an improvement to the embodiment of the present invention, a plurality of bone cement diffusion openings are distributed along the circumferential direction of the outer sleeve.

[0008] As an improvement to an embodiment of the present invention, a first channel for bone cement to flow through is provided in the middle of the inner sleeve, and the first channel extends from the rear end to the front end; a plurality of bone cement outlets are provided at the front end of the outer sleeve, and each bone cement outlet is connected to the first channel.

[0009] As an improvement to an embodiment of the present invention, a terminal is provided at the front end of the outer sleeve, and the bone cement outlets are all provided on the terminal; in the direction from the back to the front, the cross section of the terminal gradually decreases.

[0010] As an improvement to the embodiment of the present invention, a plurality of bone cement outlets are evenly distributed along the circumferential direction of the end head.

[0011] As an improvement to an embodiment of the present invention, an adjusting rod is provided in the inner sleeve, and a driving device is provided in the handle; the rear end portion of the adjusting rod is connected to the driving device, passes through the first channel, and is connected to the end head, and the driving device can provide a pulling force from front to back to the end head; a plurality of folding grooves are provided on the outer side surface of the outer sleeve, and the plurality of folding grooves are arranged in a row and along the extension direction of the outer sleeve.

[0012] As an improvement to an embodiment of the present invention, the first channel passes through the inner sleeve, and the end head is provided with a second channel passing through the end head, and the second channel is connected to the first channel; the adjusting rod passes through the first channel and the second channel in sequence, and a ball head is provided at the front end portion of the adjusting rod; the size of the cross section of the ball head is greater than the size of the front port of the second channel.

[0013] As an improvement to an embodiment of the present invention, a second accommodating cavity is provided in the handle, the second accommodating cavity is located behind the first accommodating cavity and extends in the front-to-back direction, and the adjusting rod extends into the second accommodating cavity; the driving device includes: an angle adjustment button and a third clamping block, both of which are located in the second accommodating cavity; the angle adjustment button can rotate along the circumference of the second accommodating cavity and cannot move in the front-to-back direction, the angle adjustment button is provided with a first screw hole facing forward, and the rear end of the third clamping block is provided with an external thread, the internal thread of the first screw hole cooperates with the external thread, the external thread is screwed into the first screw hole, and the rear end of the adjusting rod is connected to the third clamping block.

[0014] As an improvement of an embodiment of the present invention, the third clamp is provided with a second threaded hole opening toward the rear, and a bolt is provided at the rear end of the third clamp, the cross-sectional size of the bolt head of the bolt is larger than the cross-sectional size of the second threaded hole, the screw rod of the bolt cooperates with the second threaded hole and is screwed into the second threaded hole, and the front end face of the screw rod is provided with a conical recess with an advanced opening; the third clamp is provided with a tube hole extending in the front-to-back direction, the tube hole passes through the front end face of the third clamp and the bottom face of the second threaded hole, and the adjusting rod passes through the tube hole in sequence and finally extends into the second threaded hole; a cone with a cone head facing backward is provided in the second threaded hole, the cone is provided with a through hole for the rear end portion of the adjusting rod to pass through, and the cone is made of flexible material; when the bolt is rotated and the bolt moves forward, the cone can be stuck in the conical recess, and the conical recess squeezes the cone, and finally, the cone squeezes and fixes the rear end portion of the adjusting rod.

[0015] The bone cement injector provided by the embodiment of the present invention has the following advantages: the embodiment of the present invention discloses a bone cement injector, comprising: a handle and a sleeve, the sleeve is composed of an outer sleeve and an inner sleeve, the outer sleeve and the inner sleeve both extend in the front-back direction; the inner sleeve is sleeved in the outer sleeve, the handle is provided with a first accommodating cavity for accommodating bone cement, the rear ends of the outer sleeve and the inner sleeve both extend into the first accommodating cavity; a plurality of bone cement diffusion ports are provided in a preset area on the outer side of the outer sleeve, the bone cement diffusion ports penetrate the side wall of the outer sleeve, and the preset area is close to the front end. The bone cement injector can construct a plurality of bone cement injection channels inside the vertebral body during surgery, and the channels will be reinforced while being constructed to prevent bone cement leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A first structural diagram of a bone cement injector provided in an embodiment of the present invention;

[0017] Figure 2 A structural diagram of a bone cement injector provided in an embodiment of the present invention;

[0018] Figure 3 A cross-sectional view of a bone cement injector provided by an embodiment of the present invention;

[0019] Figure 4 A cross-sectional view of a bone cement injector provided by an embodiment of the present invention;

[0020] Figure 5 A structural diagram of some parts of a bone cement injector provided in an embodiment of the present invention;

[0021] Figure 6A structural diagram of some parts of a bone cement injector provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below in conjunction with the embodiments shown in the accompanying drawings. However, the embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on the embodiments are all within the protection scope of the present invention.

[0023] The following description and accompanying drawings fully illustrate the specific embodiments of this article so that those skilled in the art can practice them. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The scope of the embodiments of this article includes the entire scope of the claims, as well as all available equivalents of the claims. Herein, the terms "first", "second", etc. are only used to distinguish one element from another, without requiring or implying any actual relationship or order between these elements. In fact, the first element can also be called the second element, and vice versa. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the structure, device or equipment including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also include elements inherent to such structure, device or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the structure, device or equipment including the elements. Each embodiment is described in a progressive manner herein, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other.

[0024] The terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. in this document indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this document and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as a limitation on the present invention. In the description of this document, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] The embodiment of the present invention discloses a bone cement injector, such as Figure 1 , Figure 2, Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, including:

[0026] A handle 1 and a sleeve 2, wherein the sleeve 2 is composed of an outer sleeve 241 and an inner sleeve 242, wherein the outer sleeve 241 and the inner sleeve 242 both extend in the front-to-back direction; the inner sleeve 242 is sleeved in the outer sleeve 241, and a first accommodating cavity 11 for accommodating bone cement is provided in the handle 1, and the rear ends of the outer sleeve 241 and the inner sleeve 242 both extend into the first accommodating cavity 11; a plurality of bone cement diffusion openings 23 are provided in a preset area on the outer side surface of the outer sleeve 241, and the bone cement diffusion openings 23 penetrate the side wall of the outer sleeve 241, and the preset area is close to the front end.

[0027] Here, bone cement can be understood as a liquid, so the bone cement located in the first accommodating cavity 11 can flow along the gap between the outer sleeve 241 and the inner sleeve 242, and finally flow to the bone cement diffusion port 23, so that when the outer sleeve 241 advances (especially when the outer sleeve 241 is bent), some bone cement will seep out from the bone cement diffusion port 23. These bone cements can be understood as paste walls, which reinforce the channels (the channels are formed by the advancement of the outer sleeve 241) and avoid cracks in these channels.

[0028] Here, in order to allow the bone cement injector to work normally, bone cement needs to be injected into the first accommodating cavity 11, such as Figure 1 As shown, the bone cement injector is also equipped with a bone cement tank 3, and a bone cement injection hole 111 is provided on the handle 1. One end of the bone cement injection hole 111 is connected to the first accommodating cavity 11, and the other end is connected to the external space. The bone cement tank 3 can inject bone cement into the first accommodating cavity 11 through the bone cement injection hole 111. Optionally, the bone cement tank 3 is a syringe structure, and a quick clamp 4 and a connecting tube 5 can also be provided to fix the bone cement tank 3.

[0029] The quick chuck 4 and the bone cement tank 3 are connected by a connecting tube 5. The quick chuck 4 is made of polyethylene or other polymer materials. The connecting tube 5 and the bone cement tank 3 are both commonly used medical consumables, corresponding to the infusion tube and the needle tube respectively. The quick chuck 4 can be clamped on the handle 1, and its cement outlet is connected to the bone cement injection kit installation groove of the handle 1.

[0030] The handle 1 can be made of high-strength polymer material and stainless steel.

[0031] Here, if Figure 3As shown, an opening is provided on the handle 1, and the rear ends of the outer sleeve 241 and the inner sleeve 242 both pass through the through hole and finally extend into the first accommodating cavity 11. In order to improve the sealing between the outer sleeve 241 and the handle 1, a sealing ring 2412 can be provided at the rear end of the outer sleeve 241, and the outer sleeve 241 is sleeved in the sealing ring 2412, and the sealing ring 2412 is located at the opening.

[0032] Here, the inner sleeve 242 is located inside the outer sleeve 241, and a plurality of grooves are arranged at the rear end of the inner sleeve 242, and the shape and size correspond to the inner sleeve adjuster 243. The inner sleeve 242 plays the role of supporting the outer sleeve 241 and preventing the leakage of bone cement during the process. The inner sleeve adjuster 243 includes: an adjusting device 2431 and a fixing part 2432. The adjusting device 2431 can be in the shape of a roller, a worm, a nut, etc., and is installed on the fixing part 2432. The working principle is that when the user twists the adjuster, the adjuster will pull the inner sleeve 242 to move along the front-back direction.

[0033] Because the outer sleeve 241 has a folding groove 2411, there is a risk of bending when it encounters a hard object, and the bone cement diffusion port 23 therein has a risk of leakage during movement. Therefore, the present invention provides an inner sleeve 242 to provide support and prevent bone cement leakage during movement, and when constructing a bone cement channel, the inner sleeve can be moved forward through the inner sleeve adjuster 243 to leave space for bending and a channel for bone cement to flow out.

[0034] In this embodiment, the plurality of bone cement diffusion openings 23 are distributed along the extension direction of the outer sleeve 241 .

[0035] In this embodiment, the plurality of bone cement diffusion openings 23 are distributed along the circumferential direction of the outer sleeve 241 .

[0036] In this embodiment, a first channel for bone cement to flow through is provided in the middle of the inner sleeve 242, and the first channel extends from the rear end to the front end; a plurality of bone cement outlets 22 are provided at the front end of the outer sleeve 241, and each bone cement outlet 22 is connected to the first channel. When in use, bone cement will flow out from the bone cement outlet 22.

[0037] In this embodiment, a terminal 25 is provided at the front end of the outer sleeve 241, and the bone cement outlet 22 is provided on the terminal 25; in the direction from the back to the front, the cross section of the terminal 25 gradually decreases. In the direction away from the rear end, the terminal 25 is pointed, so that the outer sleeve 241 is easier to advance in the human tissue.

[0038] In this embodiment, the plurality of bone cement outlets 22 are evenly distributed along the circumferential direction of the end head 25 .

[0039] In this embodiment, an adjustment rod 26 is provided in the inner sleeve 242, and a driving device is provided in the handle 1; the rear end of the adjustment rod 26 is connected to the driving device, passes through the first channel, and is connected to the end 25, and the driving device can provide a pulling force from the front to the back to the end 25; a plurality of folding grooves 2411 are provided on the outer side of the outer sleeve 241, and the plurality of folding grooves 2411 are arranged in a row and arranged along the extension direction of the outer sleeve 241. Here, when the driving device provides a pulling force from the front end toward the rear end to the adjustment rod 26, the end 25 will receive the pulling force from the front end toward the rear end, so that the outer sleeve 241 will bend toward the side where the folding grooves 2411 are provided.

[0040] like Figure 3 As shown, the handle 1 is also provided with a second accommodating cavity 12 for accommodating the driving device, and the second accommodating cavity 12 and the first accommodating cavity 11 are divided by a first clamping block 13. A through hole is provided in the middle of the first clamping block 13, and the adjusting rod 26 passes through the through hole. The outer side surface of the first clamping block 13 is provided with an external thread, and the inner side wall of the connecting space between the second accommodating cavity 12 and the first accommodating cavity 11 is also provided with a matching internal thread, so as to fix the first clamping block 13 to the connecting space.

[0041] Optionally, multiple folding grooves 2411 are arranged in a row and arranged along the extension direction of the outer sleeve 241, and multiple bone cement diffusion openings 23 are arranged in a row and arranged along the extension direction of the outer sleeve 241. The multiple folding grooves 2411 and the multiple bone cement diffusion openings 23 are respectively located on opposite sides of the outer sleeve 241.

[0042] In this embodiment, the first channel passes through the inner sleeve 242, and the end head 25 is provided with a second channel passing through the end head 25, and the second channel is connected to the first channel; the adjustment rod 26 passes through the first channel and the second channel in sequence, and a ball head 261 is provided at the front end of the adjustment rod 26; the size of the cross section of the ball head 261 is greater than the size of the front end of the second channel. Here, since the size of the cross section of the ball head 261 is greater than the size of the port in the second channel away from the first channel, when the driving device provides a pulling force from the front end to the rear end of the adjustment rod 26, the ball head 261 will be stuck by the port, so that the pulling force from the front end to the rear end can be applied to the end head 25, that is, the ball head is located at the narrower end of the end head, which plays a dragging role.

[0043] Optionally, when the ball head 261 is stuck by the port, the ball head 261 seals the port, thereby preventing bone debris from entering the sleeve 2 and blocking the injection port during movement.

[0044] In this embodiment, a second accommodating cavity 12 is provided in the handle 1, and the second accommodating cavity 12 is located behind the first accommodating cavity 11 and extends in the front-to-back direction, and the adjusting rod 26 extends into the second accommodating cavity 12; the driving device includes: an angle adjustment button 14 and a third clamping block 15, and the angle adjustment button 14 and the third clamping block 15 are both located in the second accommodating cavity 12; the angle adjustment button 14 can rotate along the circumference of the second accommodating cavity 12 and cannot move in the front-to-back direction, the angle adjustment button 14 is provided with a first screw hole facing forward, and the rear end of the third clamping block 15 is provided with an external thread, the internal thread of the first screw hole cooperates with the external thread, the external thread is screwed into the first screw hole, and the rear end of the adjusting rod 26 is connected to the third clamping block 15.

[0045] Here, when the angle adjustment button 14 rotates, it can drive the third clamping block 15 to move in the front-rear direction, thereby driving the adjustment rod 26 to move in the front-rear direction.

[0046] like Figure 3 , Figure 4 and Figure 5 As shown, a concave ring 141 is provided on the outer side of the angle adjustment button 14, and a protrusion 142 is provided in the second accommodating cavity 12. The protrusion 142 is inserted into the concave ring 141, so that the angle adjustment button 14 can rotate along the circumference of the first accommodating cavity 11 and cannot move in the forward and backward directions.

[0047] like Figure 3 As shown, an observation hole 16 is provided on the handle 1 , and the observation hole 16 is connected to the first accommodating cavity 11 . A scale is provided on the third clamping block 15 , so that the scale can be read through the observation hole 16 .

[0048] A hollow hexagonal thread is provided at the rear end of the angle adjustment button 14, and a hexagonal screwdriver can be used for rotation adjustment. The hexagonal screwdriver is a universal tool. The third clamping block 15 is also adjusted in the same way. The third clamping block 15 can adjust the clamping degree of the adjustment rod. The protrusion 142 fixes the forward and backward movement of the angle adjustment button 14 and only allows the angle adjustment button 14 to rotate.

[0049] In this embodiment, the third clamping block 15 is provided with a second threaded hole 151 with an opening facing backwards, and a bolt 153 is provided at the rear end of the third clamping block 15. The cross-sectional size of the bolt head of the bolt 153 is larger than the cross-sectional size of the second threaded hole 151. The screw of the bolt 153 cooperates with the second threaded hole 151 and is screwed into the second threaded hole 151. The front end surface of the screw is provided with a conical recess 1531 with an advanced opening; the third clamping block 15 is provided with a tube hole extending in the front-to-back direction, and the tube hole passes through the front end surface of the third clamping block 15 and passes through the second threaded hole 151. The bottom surface of 51, the adjusting rod 26 passes through the tube holes in sequence and finally extends into the second threaded hole 151; a cone 152 with a cone head facing backward is provided in the second threaded hole 151, and the cone 152 is provided with a through hole for the rear end of the adjusting rod 26 to pass through, and the cone 152 is made of flexible material; when the bolt 153 is rotated and the bolt 153 moves forward, the cone 152 can be inserted into the conical recess 1531, and the conical recess 1531 squeezes the cone 152, and finally, the cone 152 squeezes and fixes the rear end of the adjusting rod 26.

[0050] Here, the rear end of the adjustment rod 26 can be fixed to the third clamping block 15 by the bolt 153, and the position of the adjustment rod 26 in the left-right direction can also be adjusted.

[0051] like Figure 5 As shown, the third clamping block 15 may be composed of a first sub-clamping block 15A and a second sub-clamping block 15B, and the first and second sub-clamping blocks are connected by threads.

[0052] The outer sleeve 241, the inner sleeve 242, the adjustment rod 26 and the end 25 may all be made of austenitic stainless steel.

[0053] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0054] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A bone cement injector, characterized in that: include: A handle (1) and a sleeve (2), wherein the sleeve (2) is composed of an outer sleeve (241) and an inner sleeve (242), and the outer sleeve (241) and the inner sleeve (242) both extend in a front-to-back direction; The inner sleeve (242) is sleeved in the outer sleeve (241); a first accommodating cavity (11) for accommodating bone cement is provided in the handle (1); rear ends of the outer sleeve (241) and the inner sleeve (242) both extend into the first accommodating cavity (11); A plurality of bone cement diffusion openings (23) are provided in a preset area on the outer side surface of the outer sleeve (241), the bone cement diffusion openings (23) penetrate the side wall of the outer sleeve (241), and the preset area is close to the front end; A first channel for bone cement to flow through is provided in the middle of the inner sleeve (242), and the first channel extends from the rear end to the front end; a plurality of bone cement outlets (22) are provided at the front end of the outer sleeve (241), and each bone cement outlet (22) is communicated with the first channel; An adjusting rod (26) is provided on the inner sleeve (242), and a driving device is provided in the handle (1); a rear end portion of the adjusting rod (26) is connected to the driving device, passes through the first channel, and is connected to the end head (25), and the driving device is capable of providing a pulling force from front to back to the end head (25); a plurality of folding grooves (2411) are provided on the outer side surface of the outer sleeve (241), and the plurality of folding grooves (2411) are arranged in a row and arranged along the extension direction of the outer sleeve (241); The bone cement in the first accommodating cavity (11) can flow along the gap between the outer sleeve (241) and the inner sleeve (242), and finally flow to the bone cement diffusion opening (23), so that when the outer sleeve (241) moves forward, the bone cement can seep out from the bone cement diffusion opening (23); An inner sleeve adjuster (243), wherein the inner sleeve adjuster (243) is capable of moving the inner sleeve (242) forward to leave a curved space and a channel for bone cement to flow out.

2. The bone cement injector according to claim 1, characterized in that: The plurality of bone cement diffusion openings (23) are distributed along the extension direction of the outer sleeve (241).

3. The bone cement injector according to claim 2, characterized in that: The plurality of bone cement diffusion openings (23) are distributed along the circumferential direction of the outer sleeve (241).

4. The bone cement injector according to claim 1, characterized in that: A terminal head (25) is provided at the front end of the outer sleeve (241), and the bone cement outlets (22) are all provided on the terminal head (25); In the direction from the back to the front, the cross-section of the end head (25) gradually becomes smaller.

5. The bone cement injector according to claim 4, characterized in that: A plurality of bone cement outlets (22) are evenly distributed along the circumferential direction of the end head (25).

6. The bone cement injector according to claim 4, characterized in that: The first channel passes through the inner sleeve (242), and the end head (25) is provided with a second channel passing through the end head (25), the second channel being in communication with the first channel; The adjusting rod (26) passes through the first channel and the second channel in sequence, and a ball head (261) is provided at the front end of the adjusting rod (26); the size of the cross section of the ball head (261) is greater than the size of the front end of the second channel.

7. The bone cement injector according to claim 4, characterized in that: The handle (1) is provided with a second accommodating cavity (12), the second accommodating cavity (12) is located behind the first accommodating cavity (11) and extends in the front-rear direction, and the adjusting rod (26) extends into the second accommodating cavity (12); The driving device comprises: an angle adjustment button (14) and a third clamping block (15), wherein the angle adjustment button (14) and the third clamping block (15) are both located in the second accommodating cavity (12); The angle adjustment button (14) can rotate along the circumference of the second accommodating cavity (12) and cannot move in the front-rear direction. The angle adjustment button (14) is provided with a first screw hole facing forward. The rear end of the third clamping block (15) is provided with an external thread. The internal thread of the first screw hole cooperates with the external thread. The external thread is screwed into the first screw hole. The rear end of the adjustment rod (26) is connected to the third clamping block (15).

8. The bone cement injector according to claim 7, characterized in that: The third clamping block (15) is provided with a second threaded hole (151) with an opening facing backwards, a bolt (153) is provided at the rear end of the third clamping block (15), the cross-sectional dimension of the bolt head of the bolt (153) is larger than the cross-sectional dimension of the second threaded hole (151), the screw rod of the bolt (153) matches with the second threaded hole (151) and is screwed into the second threaded hole (151), and the front end surface of the screw rod is provided with a conical recess (1531) with an opening leading forward; The third clamping block (15) is provided with a tube hole extending in the front-to-back direction, the tube hole passes through the front end surface of the third clamping block (15) and the bottom surface of the second threaded hole (151), and the adjustment rod (26) passes through the tube hole in sequence and finally extends into the second threaded hole (151); A cone (152) with its cone head facing backwards is arranged in the second threaded hole (151), the cone (152) is provided with a through hole for the rear end of the adjusting rod (26) to pass through, and the cone (152) is made of a flexible material; When the bolt (153) is rotated and moves forward, the cone (152) can be inserted into the conical recess (1531), and the conical recess (1531) squeezes the cone (152). Finally, the cone (152) squeezes and fixes the rear end of the adjustment rod (26).

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