Hollow anchor with thread capable of being filled with bone cement

Abstract

The invention discloses a hollow anchor with a line capable of being filled with bone cement, and relates to the technical field of medical instruments, the hollow anchor comprises an anchor, a handle and a bone cement injection sleeve, the handle and the bone cement injection sleeve are hollow, and the inner side wall of the handle abuts against the outer side wall of the bone cement injection sleeve; the tip end of the handle is connected with the anchor, the bottom end of the bone cement injection sleeve penetrates through the handle and is communicated with the anchor, and a side hole is formed in the side wall of the anchor; the top end of the bone cement injection sleeve abuts against the blunt end of the handle. According to the hollow anchor with the line and capable of being filled with the bone cement, the bone cement is injected into the bone cement injection hole channel of the anchor through the bone cement injection sleeve, flows out of the side hole of the bone cement anchor and fills the connecting position of the anchor and a bone substance, the effect of fixing the bone cement anchor is achieved, loose bone seams are filled with the bone cement, and the bone cement can be injected into the bone cement injection hole channel of the anchor. Therefore, the bone strengthening effect is achieved, and the design size of the anchor body can be correspondingly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a hollow wire anchor capable of being filled with bone cement. Background Art

[0002] The shoulder joint is the joint with the largest range of motion. The rotator cuff is a complex structure composed of the supraspinatus, infraspinatus, teres minor and subscapularis. It plays an important role in maintaining the stability of the shoulder joint. The rotator cuff coordinates and cooperates with other muscle groups to participate in the activities of the shoulder joint. Regardless of the cause of the rotator cuff injury, it will have a serious impact on the movement of the shoulder joint. The main repair methods for rotator cuff injury are bone tunnel fixation and anchor fixation. The bone tunnel is difficult to operate and has a high risk of postoperative complications, which limits its clinical application. Anchor fixation is simple to operate and has a reliable fixation effect. Therefore, anchor fixation is widely used in clinical practice.

[0003] In current technology, the head of the anchor is equipped with a suture fixing device, and the suture passes through this device and comes out from the tail of the anchor. After the anchor is placed in the bone, the suture passes through the soft tissue that needs to be fixed, and then fixes the soft tissue to the bone with appropriate tension. For the inner row of anchors, threads are mostly used to increase the contact area between the anchor and the bone, enhance the strength of the anchor fixation, reduce the pressure on the bone, and reduce the instability or pull-out of the anchor caused by bone damage during the anchor force process.

[0004] Bone cement is a self-setting biomaterial used to fill the gap between bone and implant or bone cavity. Its chemical name is polymethylmethacrylate (PMMA), also known as acrylic bone cement. Bone cement is now widely used in clinical practice. Filling the gap between the prosthesis and the bone with bone cement can ensure the immediate stability of the prosthesis after surgery and allow early weight-bearing and functional exercise after surgery. Bone cement is different from glue in nature. Bone cement is a material that fills space and transmits loads through mechanical connection. Modern concepts believe that good fixation requires both micro-interlocking and bulk-filling mechanisms. Micro-interlocking fixation refers to the interlacing of bone cement in the cancellous bone to form an interface, which helps to convert the shear stress between the bone cement and the bone surface into compressive stress, significantly improve the interface strength, and avoid micro-motion of the prosthesis at the interface. Volume filling is to distribute the bone cement completely and evenly between the prosthesis and the bone, which plays a role in stress conduction.

[0005] Due to osteoporosis, it is difficult for elderly patients with osteoporosis to fix suture anchors on the bone bed, and the anchors may even be pulled out during surgery. The difficulty of repair is greatly increased compared to usual, and cases of repair failure are reported from time to time. Therefore, the repair of rotator cuff injuries in elderly patients with osteoporosis has always been a technical problem. At present, large-diameter anchors are used clinically to increase the pull-out force of the anchors, but in actual operations, even larger-diameter anchors often fail to achieve satisfactory stability when dealing with osteoporotic patients. In addition, even if bone cement is used to enhance the pull-out force of the anchors, there is often a problem of bone cement leakage in the joint cavity, which also has a certain impact on the patient's prognosis.

[0006] How to develop a hollow wire anchor that can be filled with bone cement, improve the pull-out resistance of the anchor while reducing the diameter of the anchor, and at the same time be able to seal the bone cement joint cavity has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0007] The purpose of the present invention is to provide a hollow wire anchor that can be filled with bone cement to solve the problems listed in the background technology.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] The present invention discloses a hollow anchor with a wire that can be filled with bone cement, comprising an anchor, a handle and a bone cement injection sleeve, wherein the handle and the bone cement injection sleeve are both hollow inside, and the inner side wall of the handle abuts against the outer side wall of the bone cement injection sleeve;

[0010] The tip of the handle is connected to the anchor, the bottom end of the bone cement injection sleeve passes through the handle and is connected to the anchor, and a side hole is opened on the side wall of the anchor;

[0011] The top end of the bone cement injection sleeve abuts against the blunt end of the handle.

[0012] Preferably, the bottom end of the bone cement injection sleeve is square, the top end of the bone cement injection sleeve is an inverted frustum depth limiting structure, and the middle part of the bone cement injection sleeve is a round tube.

[0013] Preferably, the anchor comprises an anchor body, one end of the anchor body is conical, and the other end of the anchor body is provided with a bone cement injection channel, and the bone cement injection channel is connected to the side hole;

[0014] A U-shaped wire-passing channel is provided on the side wall of the anchor body, and the U-shaped wire-passing channel is not connected to the bone cement injection channel.

[0015] Preferably, the bone cement injection channel is square.

[0016] Preferably, a handle sleeve groove is relatively formed on the side wall of the anchor body, and the handle sleeve groove is connected to the tip of the handle.

[0017] Preferably, the handle comprises a handle body, and an axial suture passing groove is relatively opened on the outer side wall of the handle body, and the axial suture passing groove is connected with the U-shaped wire passing channel;

[0018] A suture radial passing groove is also provided on the outer side wall of the handle body, and the suture radial passing groove is connected with the suture axial passing groove.

[0019] Preferably, the suture passes radially through the groove near the blunt end of the handle body.

[0020] Preferably, it also includes a suture limiting groove, and the suture limiting groove is opened at the blunt end of the handle body.

[0021] Preferably, a plane is provided on the outer side wall of the handle body, the plane is parallel to the suture axially passing groove, and a suture fixer is installed on the plane.

[0022] Compared with the prior art, the beneficial technical effects of the present invention are:

[0023] The present invention discloses a hollow anchor with a wire that can be filled with bone cement. The bone cement is injected into the bone cement injection channel of the anchor through a bone cement injection sleeve, flows out through the side hole of the bone cement anchor, and is filled in the connection between the anchor and the bone, thereby fixing the bone cement anchor. The bone cement is filled between the loose bone joints, thereby strengthening the bone, and can also reduce the size of the anchor body diameter accordingly during design. After the injection is completed, the bone cement injection sleeve is firstly pulled out to separate the bone cement from the anchor, thereby preventing leakage of bone cement during subsequent operations. The anchor position is stabilized by a handle, and the handle is pulled out after the bone cement solidifies, thereby completing the insertion of the anchor. In addition, the U-shaped wire-passing channel of the anchor is a closed structure, thereby avoiding direct contact between the suture and the bone cement to a great extent, thereby preventing the bone cement from corroding the suture, while retaining the sliding property of the suture, thereby ensuring the sliding pressurization function during the knotting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] Figure 1 It is a three-dimensional schematic diagram of a hollow wire anchor that can be filled with bone cement according to the present invention;

[0026] Figure 2 It is a three-dimensional schematic diagram of the anchor of the present invention;

[0027] Figure 3 It is a left side schematic diagram of the anchor bolt of the present invention;

[0028] Figure 4 It is a left side schematic diagram of the handle of the present invention;

[0029] Figure 5 This is a schematic diagram of assembling the anchor and the bone cement injection sleeve of the present invention;

[0030] Figure 6 It is an enlarged schematic diagram of part A of the present invention.

[0031] Explanation of the reference numerals: 1. Anchor; 101. Handle sleeve groove; 102. Bone cement injection channel; 103. U-shaped wire passage; 104. Side hole; 105. Anchor body; 2. Handle; 201. Suture limiting groove; 202. Suture radial passing groove; 203. Suture fixer; 204. Suture axial passing groove; 205. Handle body; 3. Bone cement injection sleeve. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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 used to limit the present invention.

[0033] like Figure 1-6 As shown, a hollow anchor with wire that can be filled with bone cement comprises an anchor 1, a handle 2 and a bone cement injection sleeve 3. The handle 2 and the bone cement injection sleeve 3 are both hollow inside, so that bone cement can be easily poured through the bone cement injection sleeve 3. The inner side wall of the handle 2 abuts against the outer side wall of the bone cement injection sleeve 3.

[0034] The tip of the handle 2 is connected to the anchor 1, the bottom end of the bone cement injection sleeve 3 passes through the handle 2 and is connected to the anchor 1, and a side hole 104 is opened on the side wall of the anchor 1 to facilitate the bone cement in the bone cement injection sleeve to flow out and fill in the connection between the anchor and the bone, thereby fixing the anchor;

[0035] The top end of the bone cement injection sleeve 3 abuts against the blunt end of the handle 2;

[0036] The bottom end of the bone cement injection sleeve 3 is square, and the top end of the bone cement injection sleeve 3 is an inverted frustum depth limiting structure, which plays a role in limiting the bone cement injection sleeve and facilitating the injection of bone cement. Further, it is convenient to knock during the anchor placement process; the middle part of the bone cement injection sleeve 3 is a round tube;

[0037] During operation, the bone cement injection sleeve is inserted into the interior of the handle, and the top end of the bone cement injection sleeve is abutted against the blunt end of the handle, and the bottom end of the bone cement injection sleeve is extended into the interior of the anchor and communicated with the side hole on the anchor body. At the same time, the anchor body is embedded with the handle. After the injection is completed, the bone cement injection sleeve is first pulled out to separate the bone cement from the anchor to prevent leakage of bone cement during subsequent operations. The anchor position is stabilized by the handle, and the handle is pulled out after the bone cement solidifies to complete the placement of the anchor.

[0038] Furthermore, the filling operation is achieved by injecting bone cement through the side holes of the anchor body, and the diameter of the anchor body can be correspondingly reduced during the design, so that a smaller-sized anchor can complete the anchoring operation, thereby improving the adaptability of the anchor to the different sizes of bones of patients and appropriately reducing the surgical wound.

[0039] Specifically, the anchor 1 includes an anchor body 105, one end of the anchor body 105 is conical, and the other end of the anchor body 105 is provided with a bone cement injection channel 102, the bone cement injection channel 102 is connected to the side hole 104, and the bone cement is filled in the loose bone joints to enhance the bone quality;

[0040] A U-shaped wire passage 103 is provided on the side wall of the anchor body 105, and the U-shaped wire passage 103 is not connected to the bone cement injection channel 102. The U-shaped wire passage of the anchor is a closed structure, which greatly avoids direct contact between the suture and the bone cement, prevents the bone cement from corroding the suture, and retains the sliding property of the suture, ensuring the sliding pressurization function during the knotting process.

[0041] Specifically, the bone cement injection channel 102 is square.

[0042] Specifically, a handle sleeve groove 101 is relatively formed on the side wall of the anchor body 105 , and the handle sleeve groove 101 is connected to the tip of the handle 2 .

[0043] Specifically, the handle 2 includes a handle body 205, and an axial suture passing groove 204 is relatively opened on the outer side wall of the handle body 205, and the axial suture passing groove 204 is connected to the U-shaped wire passing channel 103;

[0044] The outer wall of the handle body 205 is also provided with a suture radial passing groove 202, and the suture radial passing groove 202 is connected with the suture axial passing groove 204;

[0045] The suture passes radially through the groove 202 close to the blunt end of the handle body 205;

[0046] It also includes a suture limiting groove 201, which is opened at the blunt end of the handle body 205;

[0047] A plane is formed on the outer side wall of the handle body 205, the plane is parallel to the suture axial groove 204, and a suture fixer 203 is installed on the plane;

[0048] One end of the suture passes through the U-shaped thread passage from the suture axial direction through the groove and then out of the suture axial direction through the groove on the other side. At this time, both ends of the suture are finally fixed to the suture fixer on the upper part of the handle body through the suture limiting groove.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0050] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A hollow wire anchor capable of being filled with bone cement, characterized in that: It comprises an anchor (1), a handle (2) and a bone cement injection sleeve (3); the handle (2) and the bone cement injection sleeve (3) are both hollow inside, and the inner wall of the handle (2) abuts against the outer wall of the bone cement injection sleeve (3); The tip of the handle (2) is connected to the anchor (1), the bottom end of the bone cement injection sleeve (3) passes through the handle (2) and is connected to the anchor (1), and a side hole (104) is opened on the side wall of the anchor (1); The top end of the bone cement injection sleeve (3) abuts against the blunt end of the handle (2).

2. A hollow bone cement-filled wire anchor according to claim 1, characterized in that: The bottom end of the bone cement injection sleeve (3) is square, the top end of the bone cement injection sleeve (3) is an inverted frustum-shaped depth-limiting structure, and the middle part of the bone cement injection sleeve (3) is a round tube.

3. A hollow bone cement-filled anchor according to claim 2, characterized in that: The anchor (1) comprises an anchor body (105), one end of the anchor body (105) is conical, the other end of the anchor body (105) is provided with a bone cement injection channel (102), and the bone cement injection channel (102) is connected to the side hole (104); A U-shaped wire-passing channel (103) is provided on the side wall of the anchor body (105), and the U-shaped wire-passing channel (103) is not connected to the bone cement injection channel (102).

4. A hollow bone cement-filled wire anchor according to claim 3, characterized in that: The bone cement injection channel (102) is square.

5. A hollow bone cement-filled anchor according to claim 3, characterized in that: A handle sleeve groove (101) is also provided on the side wall of the anchor body (105), and the handle sleeve groove (101) is connected to the tip of the handle (2).

6. A hollow bone cement-filled anchor according to claim 3, characterized in that: The handle (2) comprises a handle body (205), and an axial suture passing groove (204) is relatively opened on the outer side wall of the handle body (205), and the axial suture passing groove (204) is connected to the U-shaped wire passing channel (103); A suture radial passing groove (202) is also provided on the outer side wall of the handle body (205), and the suture radial passing groove (202) is connected to the suture axial passing groove (204).

7. A hollow bone cement-filled anchor according to claim 6, characterized in that: The suture passes radially through the groove (202) near the blunt end of the handle body (205).

8. The hollow bone cement-filled anchor according to claim 6, characterized in that: It also includes a suture limiting groove (201), wherein the suture limiting groove (201) is opened at the blunt end of the handle body (205).

9. The hollow bone cement-filled anchor according to claim 6, characterized in that: A plane is provided on the outer side wall of the handle body (205), the plane is parallel to the suture axially passing groove (204), and a suture fixer (203) is installed on the plane.

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