Integrated bone cement stirring and injecting device

Abstract

The utility model discloses an integrated bone cement stirring and injecting device which comprises a barrel, a spray pipe and a piston rod, a feeding and discharging assembly and a piston stirring assembly are arranged at the two ends of the barrel respectively, the feeding and discharging assembly is arranged at the lower end of the barrel, a detachable structure is formed between the feeding and discharging assembly and the spray pipe, and a feeding hopper is arranged on the feeding and discharging assembly. A detachable plug is arranged in the feeding and discharging assembly, the piston stirring assembly is movably sealed at the upper end of the barrel, an air hole communicated with the barrel is formed in the piston stirring assembly, and a detachable structure is arranged between the piston stirring assembly and the piston rod. The bone cement injection device has the advantages of being easy to operate, and capable of preventing bone cement from abrading the piston stirring assembly and guaranteeing the injection effect of the bone cement.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to an integrated bone cement stirring and injection device. Background Art

[0002] Bone cement is a medical material used in orthopedic surgery, which is composed of liquid monomers and powders. After the two are mixed in a certain proportion, they can be injected into the patient's affected part in a fluid state for solidification. At present, there are many types of agitators and syringes on the market, but most of them are used separately. They need to be stirred in the agitator first and then injected into the syringe for injection. This method is not only inefficient, but also easy to solidify bone cement during the injection into the syringe, which reduces the treatment effect. In order to solve this problem, a disposable bone cement vacuum stirring and injection device with a publication number of CN219126646U is disclosed on the market. The device includes: a negative pressure pipeline, a vacuum bone cement sleeve assembly, and a nozzle. The vacuum bone cement sleeve assembly includes a sleeve body, a push-pull assembly, a stirring assembly, a sleeve cover and a base. The sleeve cover and the base are respectively connected to the two ends of the sleeve body to form a stirring cavity. The stirring assembly is slidably matched with the stirring cavity and connected to the push-pull assembly. One end of the stirring assembly is provided with a piston; the negative pressure pipeline is connected to the sleeve cover. When in use, first place the bone cement into the sleeve body, connect the negative pressure pipeline to the vacuum device, start the vacuum device to keep the stirring chamber in a vacuum state, and then drive the stirring assembly to stir through the push-pull assembly under the vacuum environment; after stirring, remove the base and connect the bone cement gun, then remove the push-pull assembly, break the stirring rod according to needs, or install different nozzles, and use it with a sealing plug if necessary. Under the push of the bone cement gun, the bone cement is output from the stirring rod or nozzle.

[0003] When adding bone cement powder and bone cement monomer, the above stirring device needs to open the sleeve cover in the sleeve assembly before adding, and a funnel is generally required to guide the flow during the adding process to prevent the monomer or powder from being scattered outside; during stirring, since the handle member in the push-pull assembly and the stirring rod in the stirring assembly are connected only by a connecting sealing ring, the handle member and the stirring rod are easily separated during use; when the stirring rod is broken, some tiny particles or powder may fall into the stirring rod, and when injected, these tiny particles or powder will be mixed with the bone cement. The bone cement powder will be injected into the patient's body together with the mud, which is harmful to the patient's health; the piston is arranged at the bottom of the stirring chamber, and is placed vertically during stirring. After the bone cement powder enters the stirring chamber, it will accumulate in the piston and the gap between the piston and the stirring chamber. When the bone cement monomer and the bone cement powder are in contact and mixed, the bone cement powder in the gap will form a paste of bone cement after encountering the monomer and get stuck in the gap. When the bone cement gun drives the piston to move, the piston will rub against the bone cement in the gap and be easily damaged, which will reduce the sealing between the piston and the stirring chamber, thereby reducing the injection effect. Utility Model Content

[0004] The utility model aims to provide an integrated bone cement stirring and injection device which is easy to operate and has a stable injection effect.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an integrated bone cement stirring and injection device, including: a cylinder, a nozzle and a piston rod, and a feed and discharge assembly and a piston stirring assembly are respectively arranged at both ends of the cylinder, and the feed and discharge assembly include: a feed pipe and a discharge pipe, the feed pipe is connected to the lower end of the cylinder, a feed hopper is opened on the side wall of the feed pipe, the discharge pipe is arranged in the feed pipe and blocks the feed hopper, a detachable connection structure is formed between the discharge pipe and the nozzle, and a detachable plug is arranged in the discharge pipe; the piston stirring assembly includes: a dynamic sealing cover, a hollow valve seat, an annular A filter membrane and a hollow stirring head, a limiting ring platform is arranged on the inner wall of the upper end of the cylinder, a hollow valve seat movable seal is arranged in the upper end of the cylinder and abuts against the limiting ring platform, a dynamic sealing cover is clamped on the upper end of the hollow valve seat, an annular groove connected with the hollow hole of the hollow valve seat is arranged on the lower end wall of the dynamic sealing cover, an air hole connected with the annular groove is arranged on the upper end wall of the dynamic sealing cover, an annular filter membrane seal is arranged at the lower end of the hollow valve seat and covers the hollow hole of the hollow valve seat, and the movable seal is arranged in the hollow valve seat after the stirring head passes through the annular filter membrane, and a detachable connection structure is provided between the piston rod and the stirring head.

[0006] Furthermore, in the aforementioned integrated bone cement stirring and injection device, the connection structure between the stirring head and the hollow valve seat is as follows: a connecting end is provided on the stirring head, a step hole is provided on the hollow valve seat, a first sealing ring is provided on the small diameter section of the step hole, an inner sealing sleeve is clamped in the large diameter section of the step hole, the inner sealing sleeve extends into the central hole of the annular filter membrane and cooperates with the hollow valve seat to fix the annular filter membrane, a first sealing ring is also provided between the inner sealing sleeve and the small diameter section, the inner diameter of the inner sealing sleeve is the same as the inner diameter of the small diameter section of the step hole, the connecting end of the stirring head is movably clamped in the inner sealing sleeve and the small diameter section of the step hole and is sealed with the two first sealing rings, and the upper end wall of the connecting end of the stirring head is not higher than the dynamic sealing cover.

[0007] Furthermore, in the aforementioned integrated bone cement stirring and injection device, a threaded hole is provided in the connecting end of the stirring head, an external thread that can be threadedly connected to the threaded hole is provided on the piston rod, and the outer diameter of the piston rod is the same as the outer diameter of the connecting end.

[0008] Furthermore, in the aforementioned integrated bone cement stirring and injection device, a plurality of downwardly protruding protrusions are evenly distributed circumferentially on the lower end wall of the inner seal, and a plurality of downwardly recessed grooves are evenly distributed circumferentially on the upper end wall of the stirring head, and the number of the protrusions is n times the number of the grooves, where n≥3 and is an integer.

[0009] Furthermore, in the aforementioned integrated bone cement mixing and injection device, a stepped hole is provided in the discharge pipe, an internal thread is provided in the large diameter section of the stepped hole, a connecting section is extended on the nozzle, the length of the connecting section is the same as the length of the large diameter section of the stepped hole, a second sealing ring, an external thread and a positioning ring are provided on the connecting section, the connecting section on the nozzle extends into the large diameter section of the stepped hole and abuts against the step of the stepped hole, the external thread on the connecting section is threadedly connected to the internal thread in the large diameter section of the stepped hole, and the positioning ring abuts against the discharge pipe.

[0010] Furthermore, in the aforementioned integrated bone cement stirring and injection device, the outer wall of the plug is a smooth side wall, a third sealing ring is arranged on the outer wall of the plug, a disc-shaped support seat is arranged at the bottom of the plug, and a boss is arranged between the disc-shaped support seat and the plug. When the plug blocks the stepped hole in the discharge pipe, the third sealing ring is sealed and fitted with the large diameter section of the stepped hole, and the discharge pipe rests on the boss.

[0011] Furthermore, in the aforementioned integrated bone cement stirring and injection device, an annular expansion groove is provided on the discharge pipe, the annular expansion groove is coaxially arranged with the stepped hole of the discharge pipe, the cross-sectional shape of the annular expansion groove is an inverted V shape, and a plurality of reinforcing ribs are arranged at circumferential intervals in the annular expansion groove.

[0012] Furthermore, the aforementioned integrated bone cement stirring and injection device, wherein a detachable flat nozzle is provided on the nozzle pipe.

[0013] Furthermore, in the aforementioned integrated bone cement stirring and injection device, anti-slip protrusions are arranged at intervals on the outer wall of the cylinder.

[0014] The utility model has the advantages that: a feed hopper is arranged on the side wall of the feed pipe, and when adding bone cement powder or bone cement monomer, the material can be added by only loosening the discharge pipe and no longer blocking the feed hopper, without disassembly and without additional funnel for diversion; the piston rod and the stirring head are connected by a thread, which improves the connection strength between the piston rod and the stirring head, can prevent the situation of separation during the stirring process, and is convenient for the piston rod and the stirring head to be separated when the bone cement gun is used for injection later; even if tiny particles are generated when the piston rod is separated from the stirring head, the tiny particles will be blocked in the connecting end of the stirring head, will not enter the barrel to mix with the bone cement, and will not enter the patient's body; the piston stirring assembly is located at the upper end of the cavity, and the bone cement powder and the bone cement monomer are mixed at the lower end of the cavity, which will not affect the piston stirring assembly, and when the bone cement gun drives the piston stirring assembly to move downward to push the bone cement, there will be no bone cement between the hollow valve seat in the piston stirring assembly and the barrel, which can ensure the sealing performance between the piston stirring assembly and the barrel, thereby ensuring the injection effect of the bone cement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic cross-sectional view of a partial structure of the integrated bone cement stirring and injection device described in the utility model.

[0016] Figure 2 It is a schematic diagram of the exploded structure of a part of the structure of the integrated bone cement stirring and injection device described in the utility model.

[0017] Figure 3 It is a schematic diagram of the structure of the nozzle.

[0018] Figure 4 It is a schematic diagram of the structure of a flat nozzle.

[0019] Figure 5 It is a structural schematic diagram of the feeding and discharging components.

[0020] Figure 6 It is a schematic diagram of the structure of the piston stirring assembly.

[0021] Figure 7 yes Figure 6 Schematic diagram of the three-dimensional structure of the middle dynamic sealing cover.

[0022] Figure 8 yes Figure 6 Schematic diagram of the three-dimensional structure of the hollow valve seat.

[0023] Fig. 9 yes Figure 6 Schematic diagram of the three-dimensional structure of the middle sealing sleeve.

[0024] Fig.10 yes Figure 6 Schematic diagram of the three-dimensional structure of the stirring head.

[0025] Fig.11 yes Figure 5 Schematic diagram of the three-dimensional structure of the middle discharge pipe. DETAILED DESCRIPTION

[0026] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and preferred embodiments.

[0027] like Figures 1 to 11 As shown, the integrated bone cement stirring and injection device described in the utility model comprises: a barrel 1, a nozzle 2 and a piston rod 3, anti-slip protrusions 11 are arranged at intervals on the outer wall of the barrel 1, a detachable flat nozzle 21 is arranged on the nozzle 2, and an inlet and outlet assembly 4 and a piston stirring assembly 5 are respectively arranged at both ends of the barrel 1. Bone cement powder and bone cement monomer can be added to the barrel 1 through the inlet and outlet assembly 4. When the nozzle 2 is fixed on the inlet and outlet assembly 4, the mixed bone cement can be guided to be discharged outwardly. The barrel 1 can be vacuumed through the piston stirring assembly 5, and the bone cement can be stirred and pushed. When the bone cement is pushed, the bone cement can be injected from the nozzle 2 of the inlet and outlet assembly 4 into the corresponding affected area.

[0028] The feed and discharge assembly 4 includes: a feed pipe 41 and a discharge pipe 42, the feed pipe 41 is threadedly connected to the lower end of the barrel 1, a feed hopper 43 is provided on the side wall of the feed pipe 41, the discharge pipe 42 extends into the feed pipe 41 and is threadedly connected to the feed pipe 41, the wall of the discharge pipe 41 blocks the feed hopper 43, a detachable connection structure is formed between the discharge pipe 42 and the nozzle 2, a stepped hole 421 is provided in the discharge pipe 42, an internal thread is provided in the large diameter section of the stepped hole 421, a connecting section 22 is extended on the nozzle 2, a second sealing ring 23 is provided on the connecting section 22, The external thread 24 and the positioning ring 25, the connecting section 22 on the nozzle 2 extends into the large diameter section of the stepped hole 421 and abuts against the step of the stepped hole 421, the external thread 24 on the connecting section 22 is threadedly connected with the internal thread in the large diameter section of the stepped hole 421, the positioning ring 25 abuts against the discharge pipe 42, an annular expansion groove 44 is provided on the discharge pipe 42, the annular expansion groove 44 is coaxially arranged with the stepped hole 421 in the discharge pipe 42, the cross-sectional shape of the annular expansion groove 44 is an inverted V-shaped, and a plurality of reinforcing ribs 441 are arranged at intervals on the circumference of the annular expansion groove 44. When the discharge pipe When there is no nozzle 2 in 42, a detachable plug 45 needs to be provided in the discharge pipe 42. The outer side wall of the plug 45 is a smooth side wall. A third sealing ring 451 is provided on the outer side wall of the plug 45. A disc-shaped support seat 452 is provided at the bottom of the plug 45. A convex shoulder is provided between the disc-shaped support seat 452 and the plug 45. When the plug 45 blocks the stepped hole 421 in the discharge pipe 42, the third sealing ring 451 is sealed and fitted with the large diameter section of the stepped hole 421, and the discharge pipe 42 abuts against the convex shoulder. When the plug 45 with the third sealing ring 451 is inserted into the stepped hole 421, When the nozzle 2 and the plug 45 are connected to the discharge pipe 42 respectively, the second sealing ring 23 in the nozzle 2 and the third sealing ring 451 in the plug 45 will exert an expansion force on the step hole 421, and after the coaxially arranged annular expansion groove 44 with an inverted V-shaped cross-section shape, the step hole 421 can be quickly opened after being subjected to the expansion force, and the sealing strength between the nozzle 2 and the plug 45 and the step hole 421 is higher the further inward, which makes it convenient for the nozzle 2 and the plug 45 to be inserted into the step hole 421, and can ensure the sealing performance between the nozzle 2 and the plug 45 and the step hole 421.

[0029] The piston stirring assembly 5 comprises: a dynamic sealing cover 51, a hollow valve seat 52, an annular filter membrane 53 and a hollow stirring head 54. A limit ring platform 12 is arranged on the inner wall of the upper end of the cylinder 1. The hollow valve seat 52 is movably sealed in the upper end of the cylinder 1 and abuts against the limit ring platform 12. The dynamic sealing cover 51 is clamped on the upper end of the hollow valve seat 52. An annular groove 511 connected to the hollow hole 521 of the hollow valve seat 52 is arranged on the lower end wall of the dynamic sealing cover 51. An air hole 512 connected to the annular groove 511 is arranged on the upper end wall of the dynamic sealing cover 51. The annular filter membrane 53 is sealingly arranged at the lower end of the hollow valve seat 52 and covers the hollow hole 521 of the hollow valve seat 53. The stirring head 54 is movably sealed in the hollow valve seat 52 after passing through the annular filter membrane 53. The connection structure between the stirring head 54 and the hollow valve seat 52 is as follows: a connecting end 541 is provided on the stirring head 54, a step hole 522 is provided in the hollow valve seat 52, a first sealing ring 523 is provided on the small diameter section of the step hole 522, an inner sealing sleeve 55 is clamped in the large diameter section of the step hole 522, the inner sealing sleeve 55 extends into the central hole of the annular filter membrane 53 and cooperates with the hollow valve seat 52 to fix the annular filter membrane 53, a first sealing ring 523 is also provided between the inner sealing sleeve 55 and the small diameter section, the inner diameter of the inner sealing sleeve 55 is the same as the inner diameter of the small diameter section of the step hole 522, the connecting end 541 of the stirring head 54 is movably clamped in the small diameter section of the inner sealing sleeve 55 and the step hole 522 and is sealed and fitted with the two first sealing rings 523, and the stirring head 54 The upper end wall of the connecting end 541 is not higher than the dynamic sealing cover 51. When the bone cement gun is used to push the piston stirring assembly 5, since the connecting end 541 of the stirring head 54 is not higher than the dynamic sealing cover 51, the pushing piston on the bone cement gun directly acts on the dynamic sealing cover 51 and the hollow valve seat 52 of the piston stirring assembly 5 to push. The hollow valve seat 52 will exert a pushing force on the stirring head 54 during the movement to make the stirring head 54 move with it, which can ensure the sealing between the hollow valve seat 52 and the connecting end 541 of the stirring head 54. If the connecting end 541 of the stirring head 54 is higher than the dynamic sealing cover 51, the pushing piston on the bone cement gun will first act on the connecting end 541 of the stirring head 54, causing a displacement between the connecting end 541 of the stirring head 54 and the hollow valve seat 52. The displacement may easily destroy the sealing performance between the connecting end 541 and the hollow valve seat 52, and the poor injection quality may be caused by air leakage during injection. A plurality of downwardly protruding protrusions 551 are evenly distributed on the circumference of the lower end wall of the inner seal 55, and a plurality of downwardly recessed grooves 542 are evenly distributed on the circumference of the upper end wall of the stirring head 54. The number of protrusions 551 is n times the number of grooves 542, where n ≥ 3 and is an integer. A detachable connection structure is provided between the piston rod 3 and the stirring head 54. A threaded hole 543 is provided in the connecting end 541 of the stirring head 54, and an external thread 31 which can be threadedly connected to the threaded hole 543 is provided on the piston rod 3. The outer diameter of the piston rod 3 is the same as the outer diameter of the connecting end 541. In this way, when the piston rod 3 drives the stirring head 54 to move up and down,Good active sealing is also formed between the piston rod 3 and the two first sealing rings 523.

[0030] The specific steps are as follows:

[0031] S1. Assemble the piston stirring assembly 5. First, insert the dynamic sealing cover 51 into the upper end of the hollow valve seat 52. The upper end wall of the dynamic sealing cover 51 is flush with the upper end wall of the hollow valve seat 52. Then, insert the annular filter membrane 53 into the lower end of the hollow valve seat 52. Then, insert the inner sealing sleeve 55 through the annular filter membrane 53 and insert it into the stepped hole 522 of the hollow valve seat 52. Then, insert the connecting end 541 of the stirring head 54 into the inner sealing sleeve 55 and the stepped hole 522 of the hollow valve seat 53 in sequence. The protrusion 551 on the inner sealing sleeve 55 is inserted into the corresponding groove 542. Finally, insert the hollow valve seat 52 with the dynamic sealing cover 51, the annular filter membrane 53 and the stirring head 54 installed into the cylinder 1 from the lower end of the cylinder 1. Then, push it upward until the hollow valve seat 52 abuts against the limiting ring platform 12 on the cylinder 1. Thread the piston rod 3 on the connecting end 541 of the stirring head 54.

[0032] S2, assemble the feed and discharge assembly 4, install the feed pipe 41 at the lower end of the cylinder 1, seal the plug 45 in the discharge pipe 42, and then extend the discharge pipe 42 into the feed pipe 41, but the discharge pipe 42 does not block the feed hopper 43, and place the cylinder 1 horizontally so that the feed hopper 43 on the feed pipe 41 faces upward;

[0033] S3, first pour the bone cement powder from the feed hopper 43 into the cylinder 1, then pour the bone cement monomer from the feed hopper 43 into the cylinder 1, and then screw the discharge pipe 42 into the feed pipe 41 to seal the feed hopper 43;

[0034] S4, connect the air hole 512 on the dynamic sealing cover 51 to the vacuum equipment through a hose, then stand the cylinder 1 vertically, the disc-shaped support seat 452 on the plug 45 plays a supporting role, turn on the vacuum equipment, and vacuumize the cylinder 1. The air in the cylinder 1 will be discharged through the annular filter membrane 53, the hollow hole 521 in the hollow valve seat 52, and the annular groove 511 and the air hole 512 on the dynamic sealing cover 51, so that the cylinder 1 is in a vacuum state, and the staff holds the piston rod 3 to drive the stirring head 54 to move up and down and rotate in the cylinder 1, so as to stir and mix the bone cement powder and bone cement monomer in the cylinder 1, and the bone cement powder and bone cement monomer cannot pass through the annular filter membrane 53;

[0035] S5. After the bone cement is mixed, the stirring head 54 is reset upward until the groove 542 on the stirring head 54 is inserted into the protrusion 551 on the inner sealing sleeve 55, and then the piston rod 3 is unscrewed from the connecting end 541 on the stirring head 54. Since the groove 542 on the stirring head 54 is engaged with the protrusion 551 on the inner sealing sleeve 55, the stirring head 54 will not rotate when the piston rod 3 is screwed, which facilitates the disassembly of the piston rod 3, and the hose is removed from the air hole 512. The cylinder 1 is fixed on the bone cement gun, the pushing piston on the bone cement gun is pressed against the piston stirring assembly 5, and then the plug 45 is pressed to prevent the plug 45 from being easily detached from the discharge pipe 42, and the bone cement gun is used for mixing. The pushing piston on the cement gun drives the piston stirring assembly 5 to move in the direction of the inlet and outlet assembly 4. Due to the sealing effect of the plug 45, the piston stirring assembly 5 applies pressure to the bone cement through the annular filter membrane 53 during movement, making the bone cement denser. Then the plug 45 is removed and the nozzle 2 is spirally installed in the outlet pipe 42. If the knee joint is injected, a flat nozzle needs to be set on the nozzle 2. If the hip joint is injected, there is no need to set a flat nozzle on the nozzle 2. After the nozzle 2 is installed, the pushing piston on the bone cement gun continues to drive the piston stirring assembly 5 to move in the direction of the inlet and outlet assembly 4, thereby pushing the bone cement in the cylinder 1 into the nozzle 2 for injection.

[0036] In S4, vacuuming may be performed without using a vacuuming device, and the bone cement in the cylinder 1 may be mixed with the stirring head 54 under normal pressure. There will be bubbles in the bone cement stirred under normal pressure. In S5, the plug 45 is not removed first, and the piston stirring assembly 5 is pushed with a bone cement gun. When the piston stirring assembly 5 applies pressure to the bone cement, the bubbles in the bone cement will be destroyed, and then discharged out through the annular filter membrane 53, the hollow holes on the hollow valve seat 52, and the annular groove 511 and the air holes 512 on the dynamic sealing cover 51. After the bubbles in the bone cement stirred under normal pressure are destroyed, the bone cement can be compacted like the bone cement stirred under vacuum.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the utility model should be included in the scope of protection of the claims of the utility model.

Claims

1. An integrated bone cement stirring and injection device, comprising: The invention relates to a cylinder, a nozzle and a piston rod, wherein: a feed-in and a discharge assembly and a piston stirring assembly are respectively arranged at both ends of the cylinder, and the feed-in and a discharge assembly include: a feed pipe and a discharge pipe, the feed pipe is connected to the lower end of the cylinder, a feed hopper is provided on the side wall of the feed pipe, the discharge pipe is arranged in the feed pipe and blocks the feed hopper, a detachable connection structure is formed between the discharge pipe and the nozzle, and a detachable plug is arranged in the discharge pipe; the piston stirring assembly includes: a dynamic sealing cover, a hollow valve seat, an annular filter membrane and a hollow stirring head, and a A limiting ring platform is provided on the inner wall, the movable seal of the hollow valve seat is arranged in the upper end of the cylinder and abuts against the limiting ring platform, the dynamic sealing cover is clamped on the upper end of the hollow valve seat, and an annular groove connected with the hollow hole of the hollow valve seat is provided on the lower end wall of the dynamic sealing cover, and an air hole connected with the annular groove is provided on the upper end wall of the dynamic sealing cover. An annular filter membrane seal is provided at the lower end of the hollow valve seat and covers the hollow hole of the hollow valve seat. After the stirring head passes through the annular filter membrane, the movable seal is provided in the hollow valve seat, and a detachable connection structure is provided between the piston rod and the stirring head.

2. The integrated bone cement stirring and injection device according to claim 1, characterized in that: The connection structure between the stirring head and the hollow valve seat is as follows: a connecting end is arranged on the stirring head, a step hole is arranged on the hollow valve seat, a first sealing ring is arranged on the small diameter section of the step hole, an inner sealing sleeve is clamped in the large diameter section of the step hole, the inner sealing sleeve extends into the central hole of the annular filter membrane and cooperates with the hollow valve seat to fix the annular filter membrane, a first sealing ring is also arranged between the inner sealing sleeve and the small diameter section, the inner diameter of the inner sealing sleeve is the same as the inner diameter of the small diameter section of the step hole, the connecting end of the stirring head is movably clamped in the inner sealing sleeve and the small diameter section of the step hole and is sealed with the two first sealing rings, and the upper end wall of the connecting end of the stirring head is not higher than the dynamic sealing cover.

3. The integrated bone cement stirring and injection device according to claim 2, characterized in that: A threaded hole is arranged in the connection end of the stirring head, and an external thread which can be threadedly connected with the threaded hole is arranged on the piston rod. The outer diameter of the piston rod is the same as the outer diameter of the connection end.

4. The integrated bone cement stirring and injection device according to claim 2 or 3, characterized in that: A plurality of downwardly protruding protrusions are evenly distributed on the circumference of the lower end wall of the inner seal, and a plurality of downwardly recessed grooves are evenly distributed on the circumference of the upper end wall of the stirring head. The number of the protrusions is n times the number of the grooves, and n≥3 and is an integer.

5. The integrated bone cement stirring and injection device according to claim 1, characterized in that: A stepped hole is provided in the discharge pipe, an internal thread is provided in the large diameter section of the stepped hole, a connecting section is extended on the nozzle, a second sealing ring, an external thread and a positioning ring are provided on the connecting section, the connecting section on the nozzle extends into the large diameter section of the stepped hole and abuts against the step of the stepped hole, the external thread on the connecting section is threadably connected with the internal thread in the large diameter section of the stepped hole, and the positioning ring abuts against the discharge pipe.

6. The integrated bone cement stirring and injection device according to claim 5, characterized in that: The outer wall of the plug is a smooth side wall, and a third sealing ring is arranged on the outer wall of the plug. A disc-shaped support seat is arranged at the bottom of the plug, and a boss is arranged between the disc-shaped support seat and the plug. When the plug blocks the stepped hole in the discharge pipe, the third sealing ring is sealed and fitted with the large diameter section of the stepped hole, and the discharge pipe rests on the boss.

7. The integrated bone cement stirring and injection device according to claim 5 or 6, characterized in that: An annular expansion groove is arranged on the discharge pipe, the annular expansion groove is arranged coaxially with the stepped hole of the discharge pipe, the cross-section of the annular expansion groove is an inverted V shape, and a plurality of reinforcing ribs are arranged at circumferential intervals in the annular expansion groove.

8. The integrated bone cement stirring and injection device according to claim 1, characterized in that: A detachable flat nozzle is arranged on the spray pipe.

9. The integrated bone cement stirring and injection device according to claim 1, characterized in that: Anti-slip protrusions are arranged at intervals on the outer side wall of the cylinder.

Images