Intramedullary bone cement injector for limb pathological fracture

Abstract

The utility model discloses a limb pathological fracture intramedullary bone cement injector which comprises an injection head, an injector body and a material injection funnel, and the material injection funnel is used for injecting bone cement into the injector body. The injector body comprises a pipe body and a piston propeller, the pipe body comprises a charging barrel and an outer barrel body, the outer barrel body is fixedly arranged on the outer side wall of the charging barrel in the circumferential direction of the charging barrel, a filling cavity is formed between the outer barrel body and the charging barrel, and brine ice is filled in the filling cavity; a water inlet and a water outlet are formed in the outer wall of the outer cylinder; the piston propeller is movably mounted in the charging barrel from the tail part; and the injection head and the injection funnel are detachably connected with the head of the charging barrel. The device is easy and convenient to use, bone cement can be fully injected into a marrow cavity through the screw holes, the setting time of the bone cement can be effectively prolonged, and the operation quality and safety are improved.

Description

Technical Field

[0001] The utility model belongs to the field of orthopedic surgical instruments, and in particular relates to an intramedullary bone cement injector for pathological fractures of limbs. Background Art

[0002] Bone cement can provide good mechanical stability for the pathological fracture ends of the limbs and increase the local stiffness in response to deformation; bone cement filling can fit the geometric shape of the bone marrow cavity of the limbs, and the bone cement will not degrade after surgery. In case of tumor recurrence, it is easy to find, which is suitable for early postoperative evaluation. In order to effectively solve the problem of rapid injection and effective filling of bone cement in the bone marrow cavity during surgery, the best treatment plan is: after the pathological fracture lesions of the limbs are completely removed, the fracture is reduced, the steel plate and screws are implanted, and the fluoroscopic steel plate is in a good position and the screw length is appropriate. Without moving the steel plate and most of the screws, the bone cement injector is used to fill the bone marrow cavity through the bone defect area of ​​the pathological fracture and the single screw hole in the middle of the fracture segment on both sides (the screw of the nail hole is temporarily removed first, because the screw hole is located in the middle, bone cement is easier to be injected into the bone marrow cavity on both sides of the screw hole). After the bone cement filling is completed and the fluoroscopic effect is satisfactory, the screws that were previously removed are implanted in situ before the bone cement solidifies.

[0003] However, the existing bone cement injectors have the following problems when used: a. The screw holes in the bone defect area of ​​the pathological fracture and the middle part of the two fracture segments may be too small to be inserted into the bone marrow cavity using a conventional bone cement injector; b. The conventional hard bone cement injector cannot adapt to the angle between the screw hole entrance and the bone marrow cavity and deforms, resulting in a limited depth of the injection tube entering the bone marrow cavity, resulting in insufficient amount of bone cement injected into the bone marrow cavity, especially resulting in the inability of bone cement to be filled into the bone marrow cavity at both ends of the fracture, thereby affecting the effect of surgical fixation. Utility Model Content

[0004] In order to address the deficiencies of the prior art, the utility model aims to provide an intramedullary bone cement injector for pathological fractures of the limbs. The device is simple and convenient to use, can fully inject bone cement into the medullary cavity through the screw hole, and can effectively prolong the coagulation time of bone cement, thereby significantly improving the quality and safety of surgery.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A bone cement syringe for pathological fractures of limbs in the medullary cavity comprises an injection head, a syringe body and a filling funnel, wherein the filling funnel is used for injecting bone cement into the syringe body; the syringe body comprises a tube body and a piston pusher, the tube body comprises a barrel and an outer barrel body, the outer barrel body is fixedly arranged on the outer side wall of the barrel along the circumference of the barrel, a filling cavity is formed between the outer barrel body and the barrel, and ice salt water is filled in the filling cavity; a water inlet and a water outlet are arranged on the outer wall of the outer barrel; the piston pusher is movably installed in the barrel from the tail; the injection head and the filling funnel are both detachably connected to the head of the barrel.

[0007] Preferably, the injection head comprises a flexible hose and a tube seat, and the flexible hose is connected to the barrel head via the tube seat.

[0008] Preferably, the outer wall of the barrel head is provided with an external thread, and the tube seat thread sleeve is arranged on the external thread of the barrel head.

[0009] Preferably, the discharge port of the injection funnel is movably plugged into the head of the barrel.

[0010] Preferably, both the water inlet and the drain outlet are provided with pluggable fixing plugs.

[0011] Preferably, an anti-loss connecting belt is provided between the fixing plug and the water inlet and the drain outlet.

[0012] Preferably, the barrel and the outer barrel are both transparent tubes, and a metering scale is provided on the outer wall of the barrel.

[0013] Preferably, a support plate extending outward is provided at the tail opening of the barrel.

[0014] Preferably, the piston pusher comprises a piston block, a piston rod and a push handle, the piston block is movably arranged in the barrel, one end of the piston rod is mounted on the piston block, and the push handle is fixed to the other end of the piston rod extending out of the barrel.

[0015] The beneficial effects of the utility model are:

[0016] 1. The utility model injects ice salt water into the perfusion cavity through the water inlet. Due to the low temperature conduction effect of the ice salt water, the temperature of the bone cement in the barrel can be reduced, thereby effectively prolonging the solidification time of the bone cement. In this way, there is sufficient operation time to see through the filling effect of the bone cement before the injected bone cement is completely solidified, and a sufficient amount of bone cement can be injected when necessary. It can also provide ample time for screwing in the screws that were previously removed for the convenience of injecting bone cement and fixing the steel plate, thereby achieving the best treatment effect.

[0017] 2. The injection tube of the injection head of the utility model is not made of conventional hard materials but of soft materials. The flexible hose has the ability to deform to adapt to the shape of the screw hole and the bone marrow cavity, so that the flexible hose can be bent through the screw hole and inserted into the bone marrow cavity to inject bone cement. There is no need to inject through multiple screw holes, which may cause a large range of bone cement to leak out of the bone and cause foreign body retention in the soft tissue of the limbs, compression of surrounding blood vessels and nerves, etc., thereby improving the safety of the operation. It can also fully extend into the bone marrow cavity of the limbs, so that the bone cement can fully fill the bone marrow cavity of the diseased area without affecting the internal fixation of the screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of the syringe body of the utility model;

[0019] Figure 2 This is a schematic diagram of the installation of the injection funnel and the syringe body of the utility model;

[0020] Figure 3 This is a schematic diagram of the installation of the injection head and the syringe body of the utility model;

[0021] Figure 4 This is a usage state diagram of the utility model. DETAILED DESCRIPTION

[0022] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of use of the present invention.

[0023] like Figure 1-4 As shown, the utility model proposes a bone cement syringe for pathological fractures of limbs in the medullary cavity, including an injection head 4, a syringe body and a filling funnel 3, and the filling funnel 3 is used to inject bone cement into the syringe body. The syringe body includes a tube body 1 and a piston pusher, and the tube body 1 includes a barrel 11 and an outer barrel 12. The outer barrel 12 is arranged on the outer side wall of the barrel 11 along the circumference, so that the tube body 1 forms a double-layer structure, and the inside of the barrel 11 is a bone cement storage chamber, and a perfusion chamber 10 is formed between the outer barrel 12 and the barrel 11, and the perfusion chamber 10 is filled with ice salt water. The barrel 11 and the outer barrel 12 are both transparent tubes, and a metering scale 111 is provided on the outer wall of the barrel 11 for easy observation and measurement, and the total capacity is 30ml. Specifically, the inner diameter of the perfusion chamber 10 is 10mm on one side.

[0024] The outer wall of the outer cylinder 12 is provided with a water inlet 121 and a drain outlet 122; the water inlet 121 and the drain outlet 122 are both provided with pluggable fixed plugs 120, and the fixed plugs 120 are used to fill the water inlet 121 and the drain outlet 122 to achieve rapid sealing of the water inlet 121 and the drain outlet 122. In order to prevent the fixed plug 120 from being lost, the present application is provided with anti-lost connecting belts between the fixed plug 120 and the water inlet 121 and the drain outlet 122. The diameter of the water inlet 121 and the drain outlet 122 can be 5 mm, which is convenient for connecting a syringe to inject ice salt water.

[0025] Ice salt water is injected into the perfusion cavity 10 through the water inlet 121. Due to the low temperature conduction effect of the ice salt water, the temperature of the bone cement in the barrel 11 can be reduced, thereby effectively prolonging the solidification time of the bone cement. In this way, there is sufficient operation time to see the filling effect of the bone cement before the injected bone cement is completely solidified, and sufficient bone cement can be injected when necessary. It can also provide sufficient time for screwing in the screws that were previously removed for the convenience of injecting bone cement and fixing the steel plate, thereby achieving the best treatment effect.

[0026] The injection head 4 and the injection funnel 3 are both detachably connected to the head of the barrel 11. The injection head 4 includes a flexible hose 42 and a pipe seat 41, and the flexible hose 42 is connected to the head of the barrel 11 through the pipe seat 41. In this embodiment, the outer wall of the head of the barrel 11 is provided with an external thread, and the pipe seat 41 is threadedly sleeved on the external thread of the head of the barrel 11. The tail end of the injection head 4 is screwed and fixed with the thread of the head of the barrel 11 through a threaded structure, which makes it more convenient to install and disassemble the injection head 4.

[0027] The conventional hard injection tube lacks the ability to deform, so the amount of bone cement injected into the injection hole with limited space is insufficient, resulting in poor filling effect of bone cement in the bone marrow cavity. However, the injection tube of the injection head 4 of the utility model is not made of conventional hard materials but of soft materials, and the flexible hose 42 has the ability to deform to adapt to the shape of the screw hole and the bone marrow cavity, so that the flexible hose 42 can be bent through the screw hole and inserted into the bone marrow cavity to inject bone cement, and there is no need to inject through multiple screw holes, which will cause a large range of bone cement to leak out of the bone, causing foreign body retention in the soft tissue of the limbs, compression of surrounding blood vessels and nerves, etc., thereby improving the safety of the operation, and can also fully extend into the bone marrow cavity of the limbs for filling, so that the bone cement can fully fill the bone marrow cavity of the lesion area without affecting the internal fixation of the screw.

[0028] Specifically, the inner diameter of the head end of the barrel 11 is 10mm, and the flexible hose 42 is a polymer polyethylene hose. The polymer polyethylene hose has certain toughness and deformability, and can be inserted into the medullary cavity forward through the screw hole in the medullary cavity so as to inject sufficient bone cement into both ends of the medullary cavity. The hose is an oblong tube with an inner diameter of 1.5mm or 3mm at the head end and a tube length of 100mm. It can effectively adapt to the anatomical structure in the medullary cavity and is convenient for insertion into the medullary cavity of the limbs through the screw hole. Among them, the inner diameters of the medullary cavities of the ulna and radius of the general Chinese are 4.6-6.5mm and 5.9-13.3mm respectively. After using 3.5mm diameter screws for internal fixation, a polymer polyethylene hose with an inner diameter of 1.5mm can be used outside the narrowest area of ​​the medullary cavity. The inner diameters of the medullary cavities of the humerus, tibia, and femur are 7.1-12.1mm, 9.0-12.5mm, and 9.1-13.1mm respectively. After using 5.0mm diameter screws for internal fixation, a polymer polyethylene hose with an inner diameter of 3mm can be used outside the narrowest area of ​​the medullary cavity.

[0029] In order to facilitate the installation and disassembly of the injection funnel 3, the discharge port below the injection funnel 3 in this embodiment is movably plugged into the head end of the barrel 11. Specifically, the specific size of the injection funnel 3 can be selected as follows: the upper inlet has an inner diameter of 30mm and an outer diameter of 50mm, which is convenient for pouring the bone cement after stirring and mixing; the lower outlet has an inner diameter of 8mm, which is convenient for docking with the syringe body.

[0030] The rear opening of the barrel 11 is provided with a support plate 112 extending outward, which is convenient for finger support when the syringe is used. The piston pusher is movably installed in the barrel 11 from the rear. The piston pusher includes a piston block 21, a piston rod 22 and a push handle 23. The piston block 21 is movably arranged in the barrel 11, one end of the piston rod 22 is installed on the piston block 21, and the push handle 23 is fixed to the other end of the piston rod 22 extending outside the barrel 11. The pressure push handle 23 pushes the piston block 21 inward through the piston rod 22 to move, thereby squeezing the bone cement in the barrel 11 out of the injection head 4.

[0031] The bone cement injector provided by the utility model can be applied to the "pathological fracture lesion removal + bone cement filling internal fixation" of the limb bones: after the bone metastasis lesions are completely and thoroughly scraped, the bone and the bone marrow cavity of the surgical area are fully exposed, and the plate screws are reset and fixed in parallel, the piston pusher is pulled to pour the mixed bone cement into the barrel 11 through the injection funnel 3, and after the injection funnel 3 is removed, the injection head 4 is installed on the head of the barrel 11, and the flexible hose 42 is inserted into the corresponding screw holes at both ends of the fracture (the bone cortical holes on the opposite side of the inserted screw holes are temporarily closed with bone wax to prevent the bone cement from leaking outward), and inserted into the middle and both ends of the fracture segment through the bone marrow cavity. By injecting a sufficient amount of bone cement to thoroughly fill the bone marrow cavity of the fracture segment and all screw fixation areas, the effect of thoroughly reinforcing the pathological fracture area can be achieved. After the effect of the perspective bone cement filling is satisfactory, the screws pre-removed from the screw holes at both ends of the fracture are screwed back into the original position before the bone cement is completely solidified.

[0032] The bone cement injector provided by the utility model can help complete fracture reduction and internal fixation and fully fill the bone cement in the bone marrow cavity at one time, effectively shortening the operation time. The cooling effect of the ice salt water in the outer tube cavity prolongs the effective operation time of bone cement solidification, avoiding problems such as loose internal fixation of steel plates and screws, inaccurate screw length, large amounts of peripheral leakage of bone cement through screw holes, and inability to continue to push the bone cement due to premature solidification, thereby improving the safety of the operation, reducing the operation time and effectively reducing the risks and complications of related operations.

[0033] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A bone cement injector for intramedullary cavity of pathological fractures of limbs, comprising an injection head and an injector body, characterized in that: It also includes an injection funnel for injecting bone cement into the syringe body; the syringe body includes a tube body and a piston pusher, the tube body includes a barrel and an outer barrel, the outer barrel is fixedly arranged on the outer side wall of the barrel along the circumference of the barrel, and an injection cavity is formed between the outer barrel and the barrel, and ice salt water is filled in the injection cavity; a water inlet and a water outlet are arranged on the outer wall of the outer barrel; the piston pusher is movably installed in the barrel from the tail; the injection head and the injection funnel are both detachably connected to the head of the barrel.

2. The intramedullary bone cement injector for pathological fractures of limbs according to claim 1, characterized in that: The injection head comprises a flexible hose and a pipe seat, and the flexible hose is connected to the barrel head through the pipe seat.

3. The intramedullary bone cement injector for pathological fractures of limbs according to claim 2, characterized in that: The outer wall of the barrel head is provided with external threads, and the pipe seat thread sleeve is arranged on the external threads of the barrel head.

4. The intramedullary bone cement injector for pathological fractures of limbs according to claim 1, characterized in that: The discharge port of the injection funnel is movably plugged into the head of the barrel.

5. The intramedullary bone cement injector for pathological fractures of limbs according to claim 1, characterized in that: The water inlet and the drain outlet are both provided with pluggable fixing plugs.

6. The bone cement injector for intramedullary cavity of pathological fractures of limbs according to claim 5, characterized in that: Anti-lost connecting belts are provided between the fixing plug and the water inlet and the drain outlet.

7. The intramedullary bone cement injector for pathological fractures of limbs according to claim 1, characterized in that: The barrel and the outer barrel are both transparent tubes, and a metering scale is arranged on the outer wall of the barrel.

8. The intramedullary bone cement injector for pathological fractures of limbs according to claim 1, characterized in that: A support plate extending outward is provided at the tail opening of the barrel.

9. The intramedullary bone cement injector for pathological fractures of limbs according to claim 1, characterized in that: The piston pusher comprises a piston block, a piston rod and a push handle. The piston block is movably arranged in the barrel, one end of the piston rod is mounted on the piston block, and the push handle is fixedly arranged at the other end of the piston rod extending out of the barrel.

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