CN108784764A - Dynamic pressing suture anchor - Google Patents

Abstract

The invention discloses a dynamic pressurization type suture anchor, which comprises two parts: an anchor main body and a dynamic pressurization bolt. The main part of the anchor includes a head, a body, a tail, a dynamic pressure groove and a threaded part; the dynamic pressure bolt includes a main body of the power pressure bolt and a suture fixing hole. The dynamic pressurized anchor of the present invention slides from the distal end to the proximal end through the dynamic pressurized bolt when the tendon is sutured and fixed, so that the main body of the anchor is pressurized to the side, which strengthens the fixation strength of the anchor in the bone, and in the joint During the activity, the tensile stress of the tendon is converted into the compressive stress of the anchor on the bone tissue, which can effectively prevent the loosening and pulling out of the anchor when it is fixed. The dynamic compression anchor of the present invention is suitable for the suturing and fixing of all tendon injuries, and is especially suitable for suturing and fixing the tendons of patients with osteoporosis.

Description

Dynamic Compression Suture Anchor

technical field

The invention belongs to the technical field of orthopedic medical devices, in particular to a minimally invasive suture anchor for repairing tendon damage, and is especially suitable for repairing and fixing tendons in patients with osteopenia or osteoporosis.

Background technique

Periarticular tendon and ligament injuries are common injuries in orthopedics. Suture anchors are often used clinically to fix the injured tendon stump to bone tissue to restore the normal structure of the tendon and joint function, and achieve the final fixation through tendon-bone healing.

The process of tendon-bone healing requires a certain contact area and firm contact stability between the tendon and the rough surface of the bone end. Therefore, the fixation strength of the anchor in the bone is the key and basis for the success of the operation.

Most of the suture anchors currently available in the market are provided with a threaded structure on the main body of the anchor. A channel with a diameter slightly smaller than the diameter of the anchor is pre-drilled, and then screwed or directly driven into the bone by rotation to achieve the purpose of fixation. However, most of the anchors are miniature anchors with a diameter of less than 3.5 mm, and the pressure stability generated by the thread and bone tissue is limited. Clinically, after the anchor is fixed, the anchor is loosened and pulled out, leading to the failure of the fixation and the failure of the operation, especially in cases of osteopenia or osteoporosis, as well as in shoulders and elbows with a large range of joint motion and strong tendon strength. Joints are more likely to occur.

Contents of the invention

At present, there is no reliable and stable technology to prevent the suture anchor from loosening and pulling out in the bone, causing fixation failure. The main purpose of the present invention is to provide a dynamic pressure suture anchor with a new fixation method. In the initial stage of fixation, when the suture is tightened, the initial pressure of the anchor in the bone can be achieved through the sliding pressure of the dynamic pressure bolt. Stablize. During joint activities, the tensile stress of tendon and ligament contraction is converted into the compressive stress of the anchor body on the surrounding bone, which further enhances the stability of the anchor in the bone and promotes tendon-bone healing.

To achieve the above object, the present invention provides the following technical solutions:

A dynamic pressurized suture anchor, comprising two parts: an anchor main body and an anchor dynamic pressurization bolt. The anchor main body is an integral structure, including an anchor head, an anchor body, an anchor tail, and an anchor Dynamic pressure groove and threaded part; the anchor body is located between the anchor head and the anchor tail, the bottom edge of the anchor head is a rounded structure, and the anchor tail is a polygonal structure, From the center of the upper surface of the anchor tail, along the radial direction of the anchor main body, there is an anchor dynamic pressure groove extending toward the anchor head. The cross-sectional area of the anchor power pressure groove is from the anchor tail to The head of the anchor gradually increases;

The anchor dynamic pressurization bolt has an integral structure, the anchor dynamic pressurization bolt includes a dynamic pressurization bolt main body and a suture fixing hole, the structure of the anchor dynamic pressurization bolt is the same as that of the anchor dynamic pressurization bolt. The structure of the groove is matched, the height of the anchor dynamic pressure bolt is smaller than the height of the anchor dynamic pressure groove and is accommodated in the anchor dynamic pressure groove for sliding, and the suture fixing hole is arranged near the anchor The circular through hole at one end of the main body of the power pressurizing bolt at the head, and the outer surface of the anchor main body opposite to the suture fixing hole are provided with a pair of incisions communicating with the anchor dynamic pressurization groove along the radial direction, a pair of The shape of the incision is consistent with the shape of the dynamic pressure plug and exposes the suture fixing hole, and a pair of the incisions communicate with the suture fixing hole to form a suture penetration channel; the threaded part It is arranged symmetrically on the outer surface of the anchor main body with the plane connecting the pair of cutouts as the symmetrical plane.

Further, the height of the anchor head accounts for 1/5-1/3 of the height of the anchor body, and the long diameter of the cross section of the anchor head is smaller than the long diameter of the cross section of the anchor main body including the threaded portion The height of the anchor body accounts for 1/3-3/5 of the height of the anchor body; the height of the anchor tail accounts for 1/5-1/3 of the height of the anchor body, and the anchor tail is Equilateral polygon structure of 4-6 sides.

Preferably, the height of the anchor head accounts for 1/4 of the height of the anchor body, the height of the anchor body accounts for 1/2 of the height of the anchor body, and the height of the anchor tail accounts for 1/2 of the height of the anchor body. 1/4 of the height, the tail of the anchor has an equihexagonal structure.

A Technical Solution: Rectangular Dynamic Compression Suture Anchor

Both the main body of the anchor and the body of the anchor are rectangular in structure, and the dynamic pressure groove of the anchor is a trapezoidal structure whose cross-sectional area gradually increases from the tail of the anchor to the head of the anchor, and the dynamic pressure groove of the trapezoidal anchor The slot hole opened in the center of the upper surface of the anchor tail is a rectangular structure; the anchor dynamic pressure bolt is a trapezoidal structure that matches the trapezoidal anchor dynamic pressure groove, and a pair of cutouts are used to match the trapezoidal anchor dynamic pressure bolt. A trapezoidal structure consistent with the shape of the threaded part, the single thread of the threaded part is a triangular structure and extends outward along the rectangular anchor body.

Further, the height of the rectangular anchor main body is greater than the maximum long diameter of the cross section of the rectangular anchor main body, the height of the rectangular anchor main body is 8-12 mm, and the maximum long diameter of the cross section of the rectangular anchor main body is 1.8 mm. -3.5mm; the long diameter of the cross-section of the rectangular anchor body is greater than the short diameter of the cross-section, and the length of the short diameter of the cross-section of the rectangular anchor body is 1.2-2.5 mm.

Preferably, the height of the rectangular anchor body is 10 mm, the maximum long diameter of the cross section of the rectangular anchor body is 2.5 mm, and the short diameter of the cross section of the rectangular anchor body is 2.0 mm.

Another Technical Solution: Cylindrical Dynamic Compression Suture Anchor

Both the main body of the anchor and the body of the anchor are cylindrical structures, and the dynamic pressure groove of the anchor is a cylindrical structure whose cross-sectional area gradually increases from the tail of the anchor to the head of the anchor. The slot hole opened in the center of the upper surface of the anchor tail by the pressure groove is a circular structure; the anchor dynamic pressure bolt is a cylindrical structure that matches the cylindrical anchor dynamic pressure groove, and a pair of cutouts are matched with the cylindrical anchor dynamic pressure groove. The cylindrical anchor dynamic pressure bolt has a consistent cylindrical structure, and the threaded portion is an external threaded structure extending from the cylindrical anchor body to the outer periphery.

Further, the diameter of the cylindrical anchor body is 1.8-3.5 mm, and the height of the cylindrical anchor body is 8-12 mm.

Preferably, the diameter of the cylindrical anchor body is 2.5 mm, and the height of the cylindrical anchor body is 10 mm.

Beneficial effects: the present invention provides a brand-new fixation method for tendon suture anchors. When the suture is tightened, the contact stress between the main body of the anchor and the bone tissue is enhanced by sliding and pressing, which can effectively prevent loosening and slipping of the anchor . During joint activities, the tensile stress of the tendon contraction is converted into the compressive stress of the anchor on the bone tissue through the dynamic compression bolt and the main body of the anchor, and the stability of the anchor in the bone is further enhanced through dynamic compression. Conducive to tendon and bone healing. The invention has a simple structure, can effectively prevent anchor loosening and pull-out during the anchor fixing process, is especially suitable for tendon suturing and fixing of patients with osteopenia or osteoporosis, and is worthy of clinical popularization and use.

Description of drawings

Figure 1 is an isometric view of a rectangular dynamic compression suture anchor of the present invention.

Fig. 2 is a front view of the rectangular dynamic compression suture anchor of the present invention.

Fig. 3 is a top view of the rectangular dynamic compression suture anchor of the present invention.

Figure 4 is an isometric view of a cylindrical dynamic compression suture anchor of the present invention.

Fig. 5 is a front view of the cylindrical dynamic compression suture anchor of the present invention.

Fig. 6 is a top view of the cylindrical dynamic compression suture anchor of the present invention.

In the figure: 1. The main body of the rectangular anchor; 11. The tail of the rectangular anchor; 12. The body of the rectangular anchor; 13. The head of the rectangular anchor; 14. The threaded part of the rectangular anchor; 15. The rectangular dynamic pressure groove; 2 . Rectangular dynamic compression bolt; 21. Main body of rectangular dynamic compression bolt; 22. Suture fixing hole of rectangular dynamic compression bolt; 3. Cylindrical anchor body; 31. Cylindrical anchor head; 32. Cylindrical anchor Nail body; 33. Cylindrical anchor tail; 34. Cylindrical dynamic pressure groove; 35. Cylindrical anchor thread; 4. Cylindrical dynamic pressure bolt; 41. Cylindrical dynamic pressure bolt body; 42 Cylindrical dynamic compression plug suture fixation hole.

specific implementation plan

The present invention will be further described below in conjunction with specific examples, but the examples are only exemplary and do not constitute any limitation to the scope of the present invention. Those skilled in the art should understand that the details and forms of the technical solutions of the present invention can be modified or replaced without departing from the spirit and scope of the present invention, but these modifications and replacements all fall within the protection scope of the present invention.

The materials used for the nail body and the dynamic pressure plug of the dynamic pressure suture anchor of the present invention can be medical metal materials, such as titanium and titanium-based alloys, or absorbable polymer materials, such as PLA. According to the principle of dynamic compression fixation, the present invention provides two forms of implementations of dynamic compression suture anchors.

Embodiment 1 Rectangular dynamic compression type suture anchor

As shown in FIG. 1 , the rectangular dynamic compression suture anchor includes two parts: a rectangular anchor body 1 and a rectangular dynamic compression plug 2 . The rectangular anchor body 1 has an integrated structure, and both the front view and the top view are rectangular structures. As shown in Figure 2, the height of the main body of the rectangular anchor a> the long diameter b of the cross section of the main body of the rectangular anchor, the height of the main body of the rectangular anchor is 8-12mm, preferably 10mm; the long diameter of the cross section of the main body of the rectangular anchor is 1.8- 3.5mm, preferably 2.5mm. As shown in FIG. 3 , the long diameter b of the cross-section of the rectangular anchor main body in the plan view>the short diameter c of the cross-section, and the length of the short diameter of the cross-section is 1.2-2.5 mm, preferably 2.0 mm. The rectangular shape of the cross-section, on the one hand, is convenient for the anchor to be placed in the bone, and on the other hand, it is beneficial for the suture to slide freely in the bone during suturing without being broken by the cutting of the bone tissue.

The rectangular anchor body 1 includes: a rectangular anchor head 13 , a rectangular anchor body 12 , a rectangular anchor tail 11 , a rectangular anchor thread 14 and a rectangular dynamic pressure groove 15 . As shown in Fig. 1, the rectangular anchor head 13 is located below the rectangular anchor main body 1, and its height accounts for 1/5-1/3 of the height of the rectangular anchor main body 1, preferably 1/4, and the major diameter of the cross section The long diameter of the cross-section of the main body of the rectangular anchor including the threaded part 14 of the rectangular anchor is smaller than the long diameter of the main body of the rectangular anchor. The rectangular anchor body 12 is located in the middle of the rectangular anchor body 1 , and its height accounts for 1/3-3/5 of the height of the rectangular anchor body 1 , preferably 1/2. The rectangular anchor tail 11 is located above the rectangular anchor main body 1, and its height accounts for 1/5-1/3 of the height of the rectangular anchor main body 1, preferably 1/4. The rectangular anchor tail 11 is equilateral 4-1/3. The hexagonal structure, preferably a hexagonal body, can be connected with the external anchor insertion handle to facilitate the insertion of the anchor. The threaded portion 14 of the rectangular anchor is a plurality of triangular structures, extending laterally from the body 12 of the rectangular anchor, and the distal angle (angle d) is an acute angle, which facilitates the smooth insertion of the anchor. The proximal angle (e angle) is greater than or equal to 90°, and the distance that the triangular body extends laterally is 0.2-0.5mm, preferably 0.4mm. The rectangular dynamic pressurization groove 15 is first opened with a rectangular groove centered on the center point of the upper surface of the rectangular anchor tail 11, with a width of 0.5-1mm, and then centered on the center point of the cross-section of the rectangular anchor main body 1, along the center of the rectangular anchor. The main body of the nail 1 has a trapezoidal groove in the radial direction, and the upper area of the trapezoidal groove is smaller than the lower area.

The rectangular dynamic pressure plug 2 has an integrated structure, including a rectangular dynamic pressure plug body 21 and a rectangular dynamic pressure plug suture fixing hole 22 . The main body 21 of the rectangular dynamic pressurizing plug is a trapezoidal structure with an area of the upper base smaller than that of the lower base, and its shape is consistent with that of the rectangular dynamic pressurizing groove 15 . The suture fixing hole 22 of the rectangular dynamic pressure bolt is arranged at the lower part of the main body 21 of the rectangular power pressure bolt, and a pair of rectangular dynamic pressure grooves 15 are opened along the radial direction of the rectangular anchor main body 1 with the center of the long diameter of the cross section. Connected incisions, the shape of a pair of said incisions is consistent with the shape of said dynamic pressurization bolt and exposes the suture fixing hole 22 of said rectangular dynamic pressurization bolt, and a pair of said incisions are consistent with the shape of said rectangular dynamic pressurization bolt. The pressing bolt suture fixing hole 22 communicates to form a suture penetration channel, which is the entrance and exit of the anchor fixing suture.

Embodiment 2 Cylindrical dynamic compression type suture anchor

As shown in FIG. 4 , the cylindrical dynamic compression suture anchor includes two parts: a cylindrical anchor body 3 and a cylindrical dynamic compression plug 4 .

The cylindrical anchor body 3 is an integrated structure, including a cylindrical anchor head 31, a cylindrical anchor body 32, a cylindrical anchor tail 33, a cylindrical dynamic pressure groove 34, and a cylindrical anchor thread Section 35. The diameter of the cylindrical anchor body 3 is 1.8-3.5 mm, preferably 2.5 mm, and the height is 8-12 mm, preferably 10 mm.

As shown in Figure 4, the cylindrical anchor head 31 is located below the cylindrical anchor body 3, accounting for 1/5-1/3, preferably 1/4, of the height of the cylindrical dynamic pressure suture anchor body. . The cylindrical anchor body 32 is located between the head and the tail of the cylindrical anchor, and its height accounts for 1/3-3/5 of the height of the cylindrical anchor body 3 , preferably 1/2. The cylindrical anchor tail 33 is located above the cylindrical anchor body 3, and its height accounts for 1/3-1/5 of the height of the cylindrical anchor body 3, preferably 1/4, and is an equilateral polygonal structure. It can be a 4-6 side body, preferably a hexagon body.

The cylindrical dynamic pressurization groove 34 is located at the center of the cylindrical anchor body 3, the cylindrical dynamic pressurization groove opened from the cylindrical anchor tail 33 to the cylindrical anchor head 31, the cylindrical dynamic pressurization The upper area of the groove 34 is smaller than the lower area. The shape of the cylindrical dynamic pressure groove 34 is consistent with the shape of the cylindrical dynamic pressure plug 4 .

The cylindrical anchor thread portion 35 is an external thread structure extending from the cylindrical anchor body 32 to the outer periphery, the diameter of the external thread is 1.8-3.5 mm, and the pitch is not particularly limited.

The cylindrical dynamic pressure plug 4 has an integral structure, including a cylindrical dynamic pressure plug body 41 and a cylindrical dynamic pressure plug suture fixing hole 42 . The main body 41 of the cylindrical dynamic pressurization bolt is a cylindrical structure with an upper base area smaller than the lower base area, which is consistent with the shape of the cylindrical dynamic pressurization groove 34, and the cylindrical dynamic pressurization bolt 4 is located in the cylindrical dynamic pressurization groove. within 34. The suture fixing hole 42 of the cylindrical dynamic pressurizing bolt is located at the lower part of the cylindrical dynamic pressurizing bolt 4, and the channel passing through from the center is the channel for fixing the suture, with a diameter of 0.5-1mm, preferably 0.8mm. After the anchor is placed in the bone, when the suture is tightened, the dynamic compression bolt slides along the dynamic compression groove toward the tail of the screw, and the main body of the anchor presses the surrounding bone tissue, which increases the initial stability of the anchor fixation. When the joint moves, the tensile stress generated by the contraction of the tendon and ligament can be converted into the compressive stress of the anchor body on the bone tissue, which further enhances the dynamic stability of the bone and tendon tissue and promotes tendon-bone healing.

Claims (9)

1. A dynamic pressurized suture anchor, characterized in that it comprises two parts, an anchor main body and an anchor dynamic pressurization bolt, the anchor main body is an integral structure, comprising an anchor head, an anchor body, The anchor tail, the anchor dynamic pressure groove and the threaded part; the anchor body is located between the anchor head and the anchor tail, the bottom edge of the anchor head is a rounded structure, and the anchor The tail is a polygonal structure, and an anchor dynamic pressure groove extending toward the anchor head is provided from the center of the upper surface of the anchor tail along the radial direction of the anchor body. The cross section of the anchor dynamic pressure groove is The area gradually increases from the tail of the anchor to the head of the anchor; The anchor dynamic pressurization bolt has an integral structure, the anchor dynamic pressurization bolt includes a dynamic pressurization bolt main body and a suture fixing hole, the structure of the anchor dynamic pressurization bolt is the same as that of the anchor dynamic pressurization bolt. The structure of the groove is matched, the height of the anchor dynamic pressure bolt is smaller than the height of the anchor dynamic pressure groove and is accommodated in the anchor dynamic pressure groove for sliding, and the suture fixing hole is arranged near the anchor The circular through hole at one end of the main body of the power pressurizing bolt at the head, and the outer surface of the anchor main body opposite to the suture fixing hole are provided with a pair of incisions communicating with the anchor dynamic pressurization groove along the radial direction, a pair of The shape of the incision is consistent with the shape of the dynamic pressure plug and exposes the suture fixing hole, and a pair of the incisions communicate with the suture fixing hole to form a suture penetration channel; the threaded part It is arranged symmetrically on the outer surface of the anchor main body with the plane connecting the pair of cutouts as the symmetrical plane. 2. A dynamic pressurized suture anchor according to claim 1, wherein the height of the anchor head accounts for 1/5-1/3 of the height of the anchor body, and the anchor head The long diameter of the cross-section of the part is less than the cross-sectional long diameter of the anchor body containing the threaded part; the height of the anchor body accounts for 1/3-3/5 of the height of the anchor body; the height of the anchor tail Occupying 1/5-1/3 of the height of the main body of the anchor, the tail of the anchor is an equilateral polygonal structure of 4-6 sides. 3. A dynamic pressurized suture anchor according to claim 2, wherein the height of the head of the anchor accounts for 1/4 of the height of the main body of the anchor, and the height of the body of the anchor accounts for 1/4 of the height of the main body of the anchor. 1/2 of the height of the main body of the anchor, the height of the tail of the anchor accounts for 1/4 of the height of the main body of the anchor, and the tail of the anchor is an equihexagonal structure. 4. A dynamic pressurization type suture anchor according to claim 1, 2 or 3, characterized in that, the anchor body and the anchor body are both rectangular in structure, and the anchor dynamic pressurization groove It is a trapezoidal structure whose cross-sectional area gradually increases from the tail of the anchor to the head of the anchor, and the trapezoidal anchor dynamic pressure groove is a rectangular structure in the center of the upper surface of the anchor tail; the dynamic pressure bolt of the anchor It is a trapezoidal structure matching the dynamic pressure groove of the trapezoidal anchor, and a pair of cutouts is a trapezoidal structure consistent with the shape of the dynamic pressure bolt of the trapezoidal anchor. The single thread of the threaded part is a triangular structure and runs along the The nail body extends outward. 5. A dynamic pressurized suture anchor according to claim 1, 2 or 3, characterized in that, the anchor body and the anchor body are both cylindrical structures, and the anchor is dynamically pressurized The groove is a cylindrical structure with a cross-sectional area gradually increasing from the anchor tail to the anchor head, and the cylindrical anchor dynamic pressure groove is a circular structure in the center of the upper surface of the anchor tail; the anchor The nail dynamic pressure bolt is a cylindrical structure that matches the cylindrical anchor dynamic pressure groove, and a pair of cutouts is a cylindrical structure that is consistent with the shape of the cylindrical anchor dynamic pressure bolt. An external thread structure extending from the cylindrical anchor body to the outer periphery. 6. A dynamic pressurized suture anchor according to claim 4, wherein the height of the rectangular anchor body is greater than the maximum major diameter of the cross-section of the rectangular anchor body, and the height of the rectangular anchor body is The height is 8-12mm, and the maximum long diameter of the cross-section of the rectangular anchor body is 1.8-3.5mm; the long diameter of the cross-section of the rectangular anchor main body is greater than the short diameter of the cross-section, and the The short diameter of the cross section is 1.2-2.5mm. 7. A dynamic pressurized suture anchor according to claim 6, wherein the height of the rectangular anchor body is 10 mm, and the maximum long diameter of the cross section of the rectangular anchor body is 2.5 mm, The short diameter of the cross-section of the rectangular anchor body is 2.0 mm. 8. A dynamic pressurized suture anchor according to claim 5, wherein the diameter of the cylindrical anchor body is 1.8-3.5 mm, and the height of the cylindrical anchor body is 8-3.5 mm. 12mm. 9 . The dynamic pressurized suture anchor according to claim 8 , wherein the diameter of the cylindrical anchor body is 2.5 mm, and the height of the cylindrical anchor body is 10 mm.