A hollow, cementable suture anchor

Abstract

The utility model discloses a hollow's can add the bone cement's take line anchor nail, relate to medical instrument technical field, including anchor nail, handle and bone cement injection sleeve, handle and bone cement injection sleeve inside are hollow, and the inside wall of handle and the outside wall of bone cement injection sleeve abut, the tip of handle is connected with anchor nail, and the bottom of bone cement injection sleeve is communicated with anchor nail through handle, and is equipped with the side hole on the lateral wall of anchor nail, and the top of bone cement injection sleeve and the blunt end of handle abut. The utility model discloses a hollow's can add the bone cement's take line anchor nail, and the bone cement is injected into the bone cement injection hole of anchor nail through bone cement injection sleeve, and flows out through the side hole of bone cement anchor nail, and fills in the junction of anchor nail and bone, plays the role of fixed bone cement anchor nail, and the bone cement is filled in the loose bone gap, plays the role of reinforcing bone, can also make the design size of anchor nail body correspondingly reduce.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a hollow, bone cement-fillable suture anchor. Background Technology

[0002] The shoulder joint has the largest range of motion among all joints. The rotator cuff, a complex structure composed of the supraspinatus, infraspinatus, teres minor, and subscapularis muscles, plays a crucial role in maintaining shoulder joint stability. The rotator cuff coordinates and works synergistically with other muscle groups to participate in shoulder joint movement. Rotator cuff injuries, regardless of the cause, will severely impact shoulder joint mobility. Repair methods for rotator cuff injuries mainly include bone tunnel fixation and anchor fixation. Bone tunnel fixation is limited in clinical application due to its operational complexity and potential postoperative complications. Anchor fixation, on the other hand, is simple to perform and provides reliable fixation; therefore, it is widely used clinically.

[0003] In current technology, the anchor head has a suture fixing device, and the suture passes through this device and exits from the tail of the anchor. After the anchor is placed into the bone, the suture passes through the soft tissue to be fixed, and then the soft tissue is fixed to the bone with appropriate tension. For internal anchors, threads are often used to increase the contact area between the anchor and the bone, enhance the anchor fixation strength, and reduce the pressure on the bone, thus reducing the possibility of anchor instability or pull-out due to bone damage during the stress process.

[0004] Bone cement is a biomaterial with self-curing properties used to fill the gaps or cavities between bone and implants. Its chemical name is polymethyl methacrylate (PMMA), also known as acrylic bone cement. Bone cement is now widely used clinically. By filling the gaps between the prosthesis and the bone, it ensures immediate stability of the prosthesis after surgery, allowing for early weight-bearing and functional exercises. Bone cement differs from adhesives in its properties. It is a material that fills spaces and transmits loads through mechanical connections. Modern concepts suggest that good fixation requires both micro-interlocking and bulk-filling mechanisms. Micro-interlocking fixation refers to the interlocking and interlocking of bone cement within the cancellous bone, which helps convert shear stress between the bone cement and the bone surface into compressive stress, significantly improving interfacial strength and preventing micromovement of the prosthesis at the interface. Bulk-filling involves completely and evenly distributing the bone cement between the prosthesis and the bone, thus playing a role in stress transmission.

[0005] In elderly patients with osteoporosis, suture anchors are difficult to fix in the bone bed due to osteoporosis, and anchor pull-out during surgery is even common, significantly increasing the difficulty of repair and leading to frequent reports of repair failures. Therefore, repairing rotator cuff tears in elderly patients with osteoporosis has always been a technical challenge. Currently, large-diameter anchors are used clinically to increase pull-out force; however, even larger diameter anchors often fail to achieve satisfactory stability in osteoporotic patients. Furthermore, even with bone cement to enhance anchor pull-out force, joint leakage of bone cement is a frequent problem, which also affects patient prognosis.

[0006] Developing a hollow, cement-fillable anchor with improved pull-out resistance while reducing the anchor diameter and sealing the bone cement joint cavity has become a pressing technical challenge for those skilled in the art. Utility Model Content

[0007] The purpose of this invention is to provide a hollow, cement-fillable anchor with a wire to solve the problems listed in the background art.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] This utility model discloses a hollow, bone cement-fillable wire anchor, comprising an anchor, a handle, and a bone cement injection sleeve. Both the handle and the bone cement injection sleeve are 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 communicates with the anchor, and a side hole is provided on the side wall of the anchor.

[0011] The top end of the bone cement injection cannula 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 circular tube.

[0013] Preferably, the anchor includes an anchor body, one end of which is conical, and the other end of which has a bone cement injection channel that communicates with the side hole.

[0014] The anchor body has a U-shaped wire passage on its side wall, and the U-shaped wire passage is not connected to the bone cement injection channel.

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

[0016] Preferably, the side wall of the anchor body is further provided with a handle sleeve groove, which is connected to the tip of the handle.

[0017] Preferably, the handle includes a handle body, and the outer side wall of the handle body is provided with a axial thread passage groove, which is connected to the U-shaped thread passage channel.

[0018] The outer wall of the handle body is also provided with a radial through groove for the stitch, which is connected to the axial through groove for the stitch.

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

[0020] Preferably, it also includes a stitch limiting groove, which is formed at the blunt end of the handle body.

[0021] Preferably, a flat surface is provided on the outer side wall of the handle body, the flat surface is parallel to the groove through which the suture passes, and a suture retainer is installed on the flat surface.

[0022] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0023] This invention relates to a hollow, cement-fillable suture anchor. Bone cement is injected into the anchor's injection channel through a bone cement injection sleeve and flows out through the anchor's side holes, filling the junction between the anchor and bone to secure the anchor. The bone cement fills the gaps between loose bone tissue, strengthening the bone and allowing for a smaller anchor diameter during design. After injection, the injection sleeve is withdrawn to detach the bone cement from the anchor, preventing leakage during subsequent operations. The handle stabilizes the anchor position, and after the bone cement solidifies, the handle is removed to complete the anchor insertion. Furthermore, the anchor's U-shaped suture channel is a closed structure, greatly minimizing direct contact between the suture and bone cement, preventing corrosion of the suture, while retaining the suture's slippage to ensure sliding pressure during knotting. Attached Figure Description

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

[0025] Figure 1 This is a three-dimensional schematic diagram of a hollow, bone cement-fillable anchor with wire.

[0026] Figure 2 This is a three-dimensional schematic diagram of the anchor bolt of this utility model;

[0027] Figure 3 This is a left-side view of the anchor of this utility model;

[0028] Figure 4 This is a schematic diagram of the handle of this utility model from the left.

[0029] Figure 5 This is a schematic diagram of the assembly of the anchor and bone cement injection sleeve of this utility model;

[0030] Figure 6 This is an enlarged schematic diagram of part A of this utility model.

[0031] Explanation of reference numerals in the attached drawings: 1. Anchor pin; 101. Handle sleeve groove; 102. Bone cement injection channel; 103. U-shaped suture passage; 104. Side hole; 105. Anchor pin body; 2. Handle; 201. Suture limiting groove; 202. Suture radial passage groove; 203. Suture fixator; 204. Suture axial passage groove; 205. Handle body; 3. Bone cement injection sleeve. Detailed Implementation

[0032] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model 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 this utility model and are not intended to limit this utility model.

[0033] like Figure 1-6 As shown, a hollow, cement-fillable wire anchor includes an anchor 1, a handle 2, and a cement injection sleeve 3. Both the handle 2 and the cement injection sleeve 3 are hollow to facilitate the injection of cement through the cement injection sleeve 3. The inner wall of the handle 2 abuts against the outer wall of the cement injection sleeve 3.

[0034] The tip of the handle 2 is connected to the anchor 1, and the bottom end of the bone cement injection sleeve 3 passes through the handle 2 and communicates with the anchor 1. The side wall of the anchor 1 is provided with a side hole 104 to facilitate the flow of bone cement from the bone cement injection sleeve and fill 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 serves to limit the position of the bone cement injection sleeve and facilitate the injection of bone cement. Furthermore, it facilitates tapping during the insertion of the anchor. 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 handle, with the top end of the sleeve abutting against the blunt end of the handle. The bottom end of the sleeve extends into the anchor and communicates with the side hole on the anchor body. At the same time, the anchor body is embedded in the handle. After injection, the bone cement injection sleeve is first pulled out to detach the bone cement from the anchor, preventing leakage during subsequent operations. The handle is used to stabilize the anchor position. After the bone cement has solidified, the handle is pulled out to complete the anchor insertion.

[0038] Furthermore, by injecting bone cement into the side holes of the anchor body to achieve the filling operation, the diameter of the anchor body can be reduced accordingly during the design. This allows smaller anchors to complete the anchoring operation, improves the anchor's adaptability to different bone sizes of patients, and also appropriately reduces the surgical wound.

[0039] Specifically, the anchor 1 includes an anchor body 105, one end of which is conical and the other end of which is provided with a bone cement injection channel 102. The bone cement injection channel 102 is connected to the side hole 104. Bone cement fills the loose bone gaps and strengthens the bone.

[0040] The anchor body 105 has a U-shaped suture channel 103 on its side wall, and the U-shaped suture channel 103 is not connected to the bone cement injection channel 102. The U-shaped suture channel 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 at the same time retains the suture's sliding property, ensuring the sliding pressure function during the knotting process.

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

[0042] Specifically, the side wall of the anchor body 105 is provided with a handle sleeve groove 101, which is connected to the tip of the handle 2.

[0043] Specifically, the handle 2 includes a handle body 205, and a axial thread passage groove 204 is provided on the outer side wall of the handle body 205, and the axial thread passage groove 204 is connected to the U-shaped thread passage channel 103.

[0044] The outer side wall of the handle body 205 is also provided with a radial thread passage groove 202, which is connected to the axial thread passage groove 204.

[0045] The stitching passes radially through the groove 202 and approaches the blunt end of the handle body 205;

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

[0047] A flat surface is provided on the outer side wall of the handle body 205. The flat surface is parallel to the axial groove 204 of the sewing thread, and a sewing thread retainer 203 is installed on the flat surface.

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

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A hollow, cement-fillable suture anchor, characterized in that: It includes 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. The inner side wall of the handle (2) abuts against the outer side 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 communicates with the anchor (1), and a side hole (104) is provided on the side wall of the anchor (1). The top end of the bone cement injection cannula (3) abuts against the blunt end of the handle (2).

2. The hollow, cement-fillable anchor pin with suture as described in claim 1, characterized in that: The bottom of the bone cement injection sleeve (3) is square, the top of the bone cement injection sleeve (3) is an inverted frustum depth-limiting structure, and the middle part of the bone cement injection sleeve (3) is a round tube.

3. A hollow, cement-fillable anchor pin with a suture as described in claim 2, characterized in that: The anchor (1) includes an anchor body (105), one end of which is conical, and the other end of which is provided with a bone cement injection channel (102), which is connected to the side hole (104). The anchor body (105) has a U-shaped wire passage (103) on its side wall, and the U-shaped wire passage (103) is not connected to the bone cement injection channel (102).

4. A hollow, cement-fillable anchor pin with a suture as described in claim 3, characterized in that: The bone cement injection channel (102) is square.

5. A hollow, cement-fillable anchor pin with a suture as described in claim 3, characterized in that: The anchor body (105) also has a handle sleeve groove (101) on its side wall, and the handle sleeve groove (101) is connected to the tip of the handle (2).

6. A hollow, cement-fillable anchor pin with a suture as described in claim 3, characterized in that: The handle (2) includes a handle body (205), and a axial thread passage groove (204) is provided on the outer side wall of the handle body (205), and the axial thread passage groove (204) is connected to the U-shaped thread passage channel (103). The outer wall of the handle body (205) is also provided with a radial thread passage groove (202), which is connected to the axial thread passage groove (204).

7. A hollow, cement-fillable anchor pin with a suture as described in claim 6, characterized in that: The stitching passes radially through the groove (202) near the blunt end of the handle body (205).

8. A hollow, cement-fillable anchor pin with a suture as described in claim 6, characterized in that: It also includes a stitch limiting groove (201), which is formed at the blunt end of the handle body (205).

9. A hollow, cement-fillable anchor pin with a suture as described in claim 6, characterized in that: A flat surface is provided on the outer side wall of the handle body (205), the flat surface is parallel to the axial groove (204) of the suture, and a suture fixer (203) is installed on the flat surface.

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