Implanter for bone cement capsule

Abstract

The present invention discloses an implanter for bone cement capsules, belonging to the field of bone cement technology. The implanter comprises a sleeve, a piston rod, a needle disposed at the bottom end of the sleeve, and a clamping member. The piston rod is inserted into the sleeve from the top end, with the outer wall of the piston rod tightly fitting with the inner wall of the sleeve. The clamping member is disposed at the bottom end of the sleeve and surrounds the needle. This implanter effectively mixes the powdered solid and liquid of the bone cement capsule and then implants it into the body.

Description

Technical Field

[0001] The present invention relates to the technical field of bone cement, in particular to an implanter for bone cement capsules. Background Art

[0002] When people with osteoporosis suffer fractures or injuries and require tissue repair and internal fixation surgery, various implants are needed, such as screws, anchors, pedicle screws, and cannulated screws. However, these traditional implants often lack sufficient holding power in this special population of people with osteoporosis, failing to achieve strong fixation and may even fail or become loose, affecting the surgical outcome. In some scenarios, pedicle screws can be used in conjunction with bone cement to create cemented pedicle screws, which provide mechanical reinforcement. This has been used clinically for many years. However, in other scenarios, there is still a lack of ways to combine bone cement and implants.

[0003] There are two main approaches to using bone cement for mechanical reinforcement in existing pedicle screw technology. Both involve pre-mixing the cement in vitro. The first involves injecting the mixed cement through an injection device, then inserting the pedicle screw and waiting for the cement to solidify. The second involves using a hollow pedicle screw, implanting the screw first, then injecting the cement through the hollow tube inside, and then waiting for the cement to solidify. Both approaches have their pros and cons, but both also present side effects such as difficulty controlling the amount of cement used, cement waste, localized overflow, uneven distribution, tissue burns, and bone cement reactions, which can even be life-threatening.

[0004] The prior art also has a design that places a bone cement capsule inside a pedicle screw, implants the whole thing into the body, and then mixes it. Bone cement is made by mixing a powdered solid and a liquid. In the prior art, a partition is set in the capsule to separate the powdered solid and the liquid. When in use, the partition is punctured to achieve mixing of the two. However, this method places high demands on the long-term corrosion resistance and waterproof performance of the capsule inner wall, especially the waterproof performance of the partition material and the sealing performance in the capsule. Otherwise, it is difficult to achieve long-term storage of the bone cement capsule. In addition, the inner diameter of the pedicle screw itself is limited, which limits the size and capacity of the bone cement capsule. The built-in design increases the manufacturing difficulty. The in vivo mixing mode process is invisible and uncontrollable, and the mixing effect is unknown. Summary of the Invention

[0005] Based on this, we considered encapsulating the powdered solid within the capsule and injecting the liquid from the outside to achieve rapid mixing of the bone cement and control the amount of bone cement used. Furthermore, the present invention proposes an implanter for the bone cement capsule, which effectively mixes the powdered solid and liquid within the capsule. The capsule can then be implanted into the target location, released, and the implanter removed.

[0006] In order to achieve the above technical objectives, the technical solution of the present invention provides an implanter for bone cement capsules, comprising a sleeve, a piston rod, a needle and a clamping member arranged at the bottom end of the sleeve;

[0007] The piston rod is inserted into the sleeve from the top end of the sleeve, and the outer wall of the piston rod is tightly matched with the inner wall of the sleeve;

[0008] The clamping piece is arranged at the bottom end of the sleeve, and the clamping piece surrounds the needle.

[0009] Furthermore, it also includes a threaded sleeve, the outer surface of the bottom of the sleeve is provided with threads, and the inner surface of the threaded sleeve is threadedly connected to the outer surface of the bottom of the sleeve.

[0010] Furthermore, it also includes a hand-held part, which includes a handle and a connecting rod. The top of the sleeve and the piston rod are located in the connecting rod, and the top of the sleeve is movably connected to the piston rod.

[0011] Furthermore, a slot is provided on the side wall of the connecting rod, and a protrusion is provided on the side wall of the piston rod. The protrusion is inserted into the slot, and the protrusion moves upward or downward along the slot.

[0012] Furthermore, it also includes a first through hole, a second through hole and a positioning pin; the first through hole is arranged on the side wall of the top of the sleeve, the second through hole is arranged on the side wall of the bottom of the connecting rod, the first through hole and the second through hole are aligned, and the positioning pin is inserted into the first through hole and the second through hole.

[0013] Furthermore, the clamping member includes a plurality of clamps, the plurality of clamps are respectively connected to the bottom end of the sleeve, the inner walls of the plurality of clamps form an accommodating cavity, and the needle is located in the accommodating cavity.

[0014] Furthermore, a bayonet is provided on the inner side of the chuck, and the horizontal distance between the side wall of the bayonet and the axial center line of the accommodating cavity gradually increases from top to bottom.

[0015] Furthermore, a boss is provided at the bottom of the inner side wall of the chuck.

[0016] Furthermore, there are two chucks, which are arranged opposite to each other at the bottom of the sleeve, and the inner walls of the two chucks form the accommodating cavity, in which the needle is located.

[0017] Furthermore, it also includes a bone cement capsule, which includes a shell and a solid part, and the solid part is filled in the shell.

[0018] Compared with the prior art, the beneficial effects of the present invention include: the piston rod is inserted into the sleeve from the top end of the sleeve, the outer wall of the piston rod is tightly matched with the inner wall of the sleeve, and the piston rod can be pulled up to draw liquid into the interior of the sleeve. Then, on the basis of clamping the capsule with the clamping member, the piston rod can be pressed down to inject the liquid into the capsule containing powdered solid to achieve the preparation of bone cement, thereby achieving effective mixing of the powdered solid and liquid in the bone cement capsule, and the amount of bone cement used is accurate and controllable, while avoiding the waste of bone cement and the side effects caused by excessive use of bone cement.

[0019] Once implanted, the bone cement capsule, combined with existing traditional orthopedic implants such as screws, anchors, pedicle screws, and cannulated screws, creates a bone cement screw, bone cement anchor, bone cement pedicle screw, or bone cement cannulated screw. This instantly enhances the mechanical strength of these implants through a similar principle to reinforced concrete. This device is particularly suitable for patients with osteoporosis who require surgery using these traditional implants due to fractures or tissue damage, cleverly improving clinical outcomes. The implant utilizes an integrated operation, integrating multiple functions, including bone cement mixing, bone cement capsule handling, implantation, release, and removal, into a single device, making it highly convenient for clinical use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a perspective view of an implanter for bone cement capsules according to Example 1 of the present invention;

[0021] Figure 2 1 is a cross-sectional view of the implanter for bone cement capsules along plane AA of Example 1 of the present invention;

[0022] Figure 3 It is a stereoscopic view of the sleeve and the clamping member of the implanter for bone cement capsules according to Example 1 of the present invention.

[0023] Explanation of the accompanying drawings: 0, bone cement capsule; 1, sleeve; 11, first through hole; 2, piston rod; 21, bump; 3, needle; 4, clamping member; 41, chuck; 411, boss; 412, bayonet; 5, threaded kit; 6, hand-held part; 61, handle; 62, connecting rod; 621, slot. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] Example 1

[0026] Combine Figure 1-3, this embodiment provides an implanter for a bone cement capsule 0, comprising a sleeve 1, a piston rod 2, a needle 3 provided at the bottom end of the sleeve 1, and a clamping member 4;

[0027] The piston rod 2 is inserted into the sleeve 1 from the top end thereof, and the outer wall of the piston rod 2 is tightly fitted with the inner wall of the sleeve 1;

[0028] The clamping member 4 is provided at the bottom end of the sleeve 1 , and the clamping member 4 surrounds the needle 3 .

[0029] Based on the above embodiment, this embodiment further includes a threaded sleeve 5. The outer surface of the bottom of the sleeve 1 is provided with threads, and the inner surface of the threaded sleeve 5 is threadedly connected to the outer surface of the bottom of the sleeve 1. When the threaded sleeve 5 is rotated, the threaded sleeve 5 moves upward or downward. When the threaded sleeve 5 moves downward, the clamping member 4 is tightened, and the clamping member 4 clamps the target bone cement capsule 0. When the threaded sleeve 5 is rotated upward, the tightening of the clamping member 4 is loosened, and the clamping member 4 can also loosen its grip on the target bone cement capsule 0.

[0030] In addition to the above embodiment, this embodiment further includes a handheld portion 6 comprising a handle 61 and a connecting rod 62. The top of the sleeve 1 and the piston rod 2 are located within the connecting rod 62, and the top of the sleeve 1 is movably connected to the piston rod 2. When the implanter is not in use, the sleeve 1 and the piston rod 2 are movably connected to prevent the piston rod 2 from being removed from the sleeve 1. When the implanter is in use, the sleeve 1 and the piston rod 2 are released from the movably connected connection, and the handheld handle 61 is used to control the up and down movement of the piston rod 2 to achieve liquid aspiration or injection.

[0031] In this embodiment, the sidewall of the connecting rod 62 is provided with a slot 621, and the sidewall of the piston rod 2 is provided with a bump 21. The bump 21 engages with the slot 621. The bump 21 moves upward or downward along the slot 621, driving the piston rod up or down. The piston rod 2 can be moved up or down by moving the bump 21. The location of the bump close to the sleeve eliminates the need to adjust the movement direction of the piston rod from the handle 61, which is located farther away.

[0032] Based on the above embodiment, this embodiment further includes a first through hole 11, a second through hole (not shown in the figure, but well understood), and a locating pin (not shown in the figure, but well understood); the first through hole 11 is provided on the top side wall of the sleeve 1, and the second through hole is provided on the bottom side wall of the connecting rod 62. The first through hole 11 and the second through hole are aligned, and the locating pin is inserted into the first through hole 11 and the second through hole. The locating pin cooperates with the first through hole 11 and the second through hole to achieve a movable connection between the piston rod 2 and the sleeve 1.

[0033] Based on the above embodiment, the clamping member 4 of this embodiment includes multiple clamps 41, each of which is connected to the bottom end of the sleeve 1. The inner walls of the multiple clamps 41 form a receiving cavity, and the needle 3 is located within the receiving cavity. The multiple clamps 41 can clamp the bone cement capsule 0 when the threaded sleeve 5 is tightened, and can release the bone cement capsule 0 when the threaded sleeve 5 is loosened.

[0034] In this embodiment, the chuck 41 is provided with a clip 412, the sidewalls of which gradually increase in horizontal distance from the axial centerline of the accommodating cavity from top to bottom. The clip formed by the chuck is slightly open, making it easier for the corresponding portion of the bone cement capsule to be inserted and matched to grip the smooth and soft bone cement capsule 0 and also easier to release the bone cement capsule.

[0035] On the basis of the above embodiment, in this embodiment, a boss 411 is provided at the bottom of the inner side wall of the clamp 41. The boss 411 can clamp the bone cement capsule 0, thereby increasing the clamping effect on the bone cement capsule 0.

[0036] On the basis of the above embodiment, the number of the chucks 41 in this embodiment is two, and the two chucks 41 are relatively arranged at the bottom of the sleeve 1. The inner walls of the two chucks 41 form the accommodating cavity, and the needle 3 is located in the accommodating cavity.

[0037] Based on the above embodiment, this embodiment further includes a bone cement capsule, which includes a shell (not shown in the figure, but well understood) and a solid portion (not shown in the figure, but well understood), the solid portion being filled within the shell. Furthermore, the solid portion is a powdered solid.

[0038] The implanter proposed in this embodiment draws in liquid, clamps the bone cement capsule, and after injecting the liquid into the bone cement capsule, the outer surface of the bone cement capsule is pinched to achieve a thorough mixing of the powdered solid and the liquid. The mixed bone cement capsule is then implanted with the implanter to the target position where it needs to be fixed, and then the implanter is released and withdrawn.

[0039] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An implanter for a bone cement capsule, characterized in that: It comprises a sleeve, a piston rod, a needle and a clamping member arranged at the bottom end of the sleeve; The piston rod is inserted into the sleeve from the top end of the sleeve, and the outer wall of the piston rod is tightly matched with the inner wall of the sleeve; The clamping member is provided at the bottom end of the sleeve, and the clamping member surrounds the needle; The sleeve further comprises a threaded sleeve, wherein the outer surface of the bottom of the sleeve is provided with a thread, and the inner surface of the threaded sleeve is threadedly connected to the outer surface of the bottom of the sleeve. When the threaded sleeve is rotated, the threaded sleeve moves upward or downward. When the threaded sleeve moves downward, the clamping member is tightened, and the clamping member clamps the target bone cement capsule. When the threaded sleeve is rotated upward, the tightening of the clamping member is loosened, and the clamping member can also loosen the clamping of the target bone cement capsule. The invention also includes a handheld portion, the handheld portion including a handle and a connecting rod, the top of the sleeve and the piston rod are located in the connecting rod, and the top of the sleeve is movably connected to the piston rod; It also includes a bone cement capsule, which includes a shell and a solid part. The solid part is filled in the shell. The operator pulls up the piston rod to draw liquid into the interior of the sleeve. Based on the clamping part clamping the capsule, the piston rod can be pressed down to inject the liquid into the capsule filled with powdered solid to prepare bone cement.

2. The implanter for bone cement capsule according to claim 1, characterized in that: A slot is formed on the side wall of the connecting rod, and a convex block is formed on the side wall of the piston rod. The convex block is inserted into the slot, and the convex block moves upward or downward along the slot.

3. The implanter for bone cement capsule according to claim 2, characterized in that: It also includes a first through hole, a second through hole and a positioning pin; the first through hole is arranged on the side wall of the top of the sleeve, the second through hole is arranged on the side wall of the bottom of the connecting rod, the first through hole and the second through hole are aligned, and the positioning pin is inserted into the first through hole and the second through hole.

4. The implanter for bone cement capsule according to claim 1, characterized in that: The clamping member includes a plurality of clamps, and the plurality of clamps are respectively connected to the bottom end of the sleeve. The inner walls of the plurality of clamps form an accommodating cavity, and the needle is located in the accommodating cavity.

5. The implanter for bone cement capsule according to claim 4, characterized in that: A bayonet is provided on the inner side of the chuck, and the horizontal distance between the side wall of the bayonet and the axial center line of the accommodating cavity gradually increases from top to bottom.

6. The implanter for bone cement capsule according to claim 5, characterized in that: A boss is provided at the bottom of the inner side wall of the clamp.

7. The implanter for bone cement capsule according to claim 5, characterized in that: There are two chucks, which are arranged opposite to each other at the bottom of the sleeve. The inner walls of the two chucks form the accommodating cavity, and the needle is located in the accommodating cavity.

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