CN115227312A - Barb type head fixing anchor with wire - Google Patents

Abstract

The invention discloses an agnail-type head fixing anchor with a thread, which comprises an anchor body made of absorbable materials, wherein at least two anchor sections are sequentially overlapped on the outer wall of the anchor body along the axis of the anchor body, the radial dimension of each anchor section is gradually increased from the head to the tail of the anchor body, the anchor sections and the anchor body are integrated, a driving groove is formed in the center of the anchor body along the axis of the anchor body, a radial through hole is formed in the position, close to the head, of the anchor body, an accommodating groove communicated with the radial through hole is formed in the outer wall of the anchor body along the axis of the anchor body, the thread is led out along the accommodating groove in the lateral direction of the anchor body after passing through the radial through hole, and the head of the anchor body is connected with an expansible nail head made of the absorbable materials. The invention can avoid the breakage of the anchor in the process of placing and increase the fixing strength of the anchor.

Description

Barb type head fixing anchor with thread

Technical Field

The invention relates to the technical field of medical equipment, in particular to a barb type head fixing anchor with a thread.

Background

Clinical studies have shown that Bone Mineral Density (BMD) of the greater tuberosity of the humerus near the rotator cuff injury can affect the biomechanical stability of the anchor after implantation. Most of the existing inlet anchor with the line is similar to a thread structure or has a barb structure, and a special structure for osteoporosis patients is not provided. Absorbable suture anchors are implants that degrade gradually with healing, and are effective in promoting bone ingrowth, which is particularly important for osteoporotic patients. However, bone anchors of absorbable material are very difficult to manufacture in particular configurations of suture anchors due to their relatively brittle nature. Accordingly, there is a need for an absorbable bone anchor that can improve fixation strength in osteoporotic patients.

Disclosure of Invention

The invention provides a barbed type head anchor with a thread, which aims at the technical problem, and increases the fixing contact area, thereby improving the fixing strength.

The technical scheme adopted by the invention is as follows: the utility model provides a fixed tape line anchor of barb type head, it includes the nail body of being made by absorbable material, nail body outer wall is folded in proper order along its axis and is established two at least anchor sections, and every anchor section radial dimension is gradually big trend from nail body head to afterbody direction, the anchor section extends from nail body outer wall, nail body central authorities open along its axis has the driving groove, nail body head lateral wall is opened has a radial through hole that supplies the suture to pass, nail body outer wall is opened along its axis has the storage tank of the radial through hole of intercommunication, the suture is drawn forth along the storage tank of nail body side direction after passing radial through hole, nail body head is connected with the pin fin that an expandable and made by absorbable material.

After adopting the structure, the invention has the following advantages: the nail body and the nail head detachably connected with the head of the nail body are made of absorbable materials, so that the nail body and the nail head are not required to be taken out or repaired by manual secondary operation; at least two anchoring sections are sequentially overlapped on the nail body, so that the nail body can be firmly placed under cortical bone after being placed, and the nail body is prevented from backing and disengaging; the anchor section is sequentially and tightly overlapped in the axis direction of the nail body, the nail body and the anchor section are integrated, the strength of the whole nail body is ensured, and different from the common suture anchors in the market, the common suture anchors in the market are generally provided with threading heads, namely the anchor section is sleeved on the threading heads, after a suture is threaded, a bone hole is punched on a bone by using a puncher, then the suture anchor is integrally implanted into a bone through an anchor inserter, then the inserter is drawn out, and the anchor section and the threading heads are left in the bone; the center of the nail body is provided with a driving groove which is connected with the inserter, the inserter drives the nail body to rotate, the nail head is laterally provided with a radial through hole which is a threading hole, the outer wall of the nail body is provided with a containing groove communicated with the radial through hole, a thread passes through the radial through hole and is led out from the containing groove, the thread is prevented from being wound and knotted, the integral integrity of the nail body and the anchoring section is realized, the integral strength is ensured, and the threading function is not influenced.

Preferably, the pin fin includes the connecting portion of being connected with the nail body, connecting portion one end extends a plurality of inflation pieces, and a plurality of inflation pieces equidistance and hoop distribute in the periphery of a nail section nearby, leave the clearance between the adjacent inflation piece in order to form the opening, when nail body head extrusion inflation piece, a plurality of inflation pieces inflation deformation simultaneously guarantee the intensity and the stability of pin fin, and the opening makes and has deformation buffer characteristic between the inflation piece, inflation piece inner wall is identical with nail section periphery wall, can laminate along the nail section when the inflation piece warp, prevents the inflation piece fracture, inflation piece outer wall is the arc surface for when inflation piece and sclerotin or tissue contact, make area of contact maximize, can avoid sharp-pointed structure to form concentrated stress again, make the pin fin fracture easily.

Preferably, a plurality of the expansion pieces completely cover a nearby anchor section, namely the length dimension of each expansion piece is larger than that of a single anchor section, and the expansion pieces can protect the head of the nail body and avoid the head of the nail body from being broken during the process of just implanting the nail head.

Preferably, the thickness of the expansion sheet is gradually reduced from the root to the top, so that the thicker root of the expansion sheet can ensure that the expansion sheet is not easily broken in the expansion deformation process; the width dimension of the expansion piece is gradually increased from the root part to the top part, so that the contact area between the top part of the expansion piece and the anchor section is maximized.

Preferably, the number of the expansion pieces is three or four, the control of the expansion degree is not facilitated when the number of the expansion pieces is too large or too small, when the number of the expansion pieces is too large, the expansion strength of the expansion pieces cannot be guaranteed, the expansion pieces are easy to break and cannot play a role in expansion, and when the number of the expansion pieces is too small, the expansion degree of the expansion pieces is not enough, so that the implantation effect is influenced.

Preferably, nail body head outer wall is equipped with the external screw thread, connecting portion central authorities axial is opened there is the through-hole, the through-hole inner wall is corresponding be equipped with the internal thread of external screw thread adaptation, realize nail body and connecting portion threaded connection, it is fixed through the threaded connection mode between nail body head and the pin fin promptly, both be convenient for load and unload, can guarantee connection stability again, because the size of bone anchor nail is very little, the stability of consequently connecting is especially important, just can guarantee to reduce the spoilage, reduces the material waste.

Preferably, the length dimension of the external thread section of the head of the nail body is greater than or equal to the length dimension of the internal thread section of the through hole, so that the connecting part is connected and covers the head of the nail body, and after the connecting part is connected, the end part of the connecting part just abuts against the end part of the anchor section close to the head of the nail body, so that the connecting strength between the nail body and the nail head is increased.

Preferably, the peripheral wall of the anchor section is a smooth surface without lines, when the anchor section is implanted into a bone, the peripheral wall of the anchor section and the bone or tissue form a contact surface which is fitted and stable, the stress of the anchor section is prevented from being excessively concentrated, and the friction between the anchor section and the bone or tissue is reduced.

Preferably, the anchor segment edges are rounded so that when implanted, the sharp edges are prevented from cutting bone or tissue.

Preferably, the anchor section is a circular truncated cone-shaped structure, and can form a thread-like implantation, so that the anchor sections can be implanted in sequence conveniently.

Drawings

Fig. 1 is an exploded view of the overall structure of the present invention.

Fig. 2 is a top view of the shank of the present invention.

FIG. 3 is an overall view of the nail head of the present invention.

FIG. 4 is a top plan view of the stud of the present invention.

FIG. 5 is a bottom view of the stud of the present invention.

Wherein, 1, nail body; 1-1, driving groove; 1-2, a containing groove; 1-3, radially penetrating a hole; 2. a nail head; 2-1, a connecting part; 2-2, opening; 2-3, expansion pieces; 3. an anchor section.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

The embodiment provides a barb type head fixing anchor with a thread, as shown in fig. 1, which comprises an anchor body 1 made of absorbable material, wherein at least two anchor sections 3 are sequentially stacked on the outer wall of the anchor body 1 along the axis, the anchor sections 3 are tightly abutted to each other and arranged on the outer wall of the anchor body 1, as shown in fig. 2, the anchor sections 3 and the anchor body 1 are integrated and also made of absorbable material, the head of the anchor body 1 is connected with a nail head 2, the center of the anchor body 1 is provided with a driving groove 1-1 along the axis, the driving groove 1-1 is a hexagonal or quincunx hole so as to be connected with an inserter to drive the rotary nail body 1, the head of the nail body 1 is provided with a radial through hole 1-3 arranged in a radial direction, and a suture passes through the radial through hole 1-3, in the embodiment, the radial through hole 1-3 is positioned on the second anchor section 3 at the head of the nail body 1, so as to avoid the first anchor section 3 being provided with an opening to affect the strength of the first anchor section 3, thereby affecting the overall strength of the nail body 1.

The outer wall of the nail body 1, that is, all the anchor sections 3, are provided with accommodating grooves 1-2 along the axial direction of the nail body 1, the accommodating grooves 1-2 are linear grooves for accommodating and guiding sutures, and the sutures are led out from the radial through holes 1-3 and then directly led out along the accommodating grooves 1-2, in this embodiment, one end of the accommodating groove 1-2 is stopped at the end face of the first anchor section 3, and the other end thereof penetrates through the tail end of the nail body 1, so that the sutures are led out from the tail end of the nail body 1, two accommodating grooves 1-2 are usually provided, and are symmetrically arranged on the outer wall of the nail body 1, and the two ends of the radial through holes 1-3 are opened correspondingly, so that the sutures are led out from any one accommodating groove 1-2, or can be led out from two accommodating grooves 1-2 simultaneously, so as to facilitate operation.

In the present embodiment, the external shape of the anchor segments 3 is not specifically limited, but the radial dimension of each anchor segment 3 is gradually increased from the head to the tail of the nail body 1, so that the shape of the anchor segment may be a cone-shaped structure such as a circular truncated cone or a pyramid with a surface curve having a gradually increasing trend as above, so that the anchor segment 3 can be inserted into a bone or a tissue without forming a sharp structure in the bone, in the present embodiment, the anchor segment 3 is a circular truncated cone-shaped structure, an upper bottom surface of the circular truncated cone faces the head of the nail body 1, a lower bottom surface of the circular truncated cone faces the tail of the nail body 1, when viewed from the head to the tail of the nail body 1, a lower bottom surface of the first anchor segment 3 is connected with an upper bottom surface of the second anchor segment 3, so that the whole nail body 1 is implanted into the bone, and the nail segment 3 is not continuously implanted into the bone by striking the tail of the nail body 1, while the radial dimension of the lower bottom surface of each anchor segment 3 is larger than that of the upper bottom surface, so that the lower bottom surface forms a structure similar to a barb-like structure, so that the bone segment 3 is not easily implanted into the bone, and the entire nail body 1 is uniformly formed with the same size, so that the hole is formed.

The nail head 2 is detachably connected with the head of the nail body 1, as shown in figure 3, the nail head 2 comprises a connecting part 2-1 connected with the nail body 1 and an expansion piece 2-3 on the connecting part 2-1, a through hole is formed in the center of the connecting part 2-1, an external thread is arranged on the outer wall of the head of the nail body 1, an internal thread matched with the through hole is correspondingly arranged in the through hole, and the head of the nail body 1 and the connecting part 2-1 are fixedly connected in a threaded connection mode, so that the nail head is firm and convenient to detach.

The number of the expansion pieces 2-3 is a plurality, the expansion pieces extend from the connecting portion 2-1 towards the end face of the tail portion of the nail body 1, the expansion pieces 2-3 are equidistantly and annularly extended to the peripheral wall of the nearby nail section 3, a gap is reserved between every two adjacent expansion pieces 2-3, openings of the expansion pieces 2-3 are upward and are located at the head portion of the nail body 1 in a wrapping manner, the peripheral wall of the nail section 3 is a circular truncated cone side wall, the inner walls of the expansion pieces 2-3 are curved surfaces matched with the circular truncated cone side wall, so that the inner walls of the expansion pieces 2-3 are attached to the nail section 3, the maximum contact area is guaranteed, namely when the nail head 2 is installed at the head portion of the nail body 1, the expansion pieces 2-3 move upward along the nearby nail section 3 and are opened in the opposite direction of the nail section 3, the inner walls of the expansion pieces 2-3 slide relative to the outer wall of the nail section 3, the contact surfaces of the inner walls of the expansion pieces 2-3 and the outer walls of the expansion pieces 3 are matched with each other, the expansion pieces are smooth, and break the contact surfaces of the expansion pieces 2-3, the expansion pieces are guaranteed to generate the maximum force when the nail section 3 is stressed, and the expansion pieces 2-3 contact force generated by the expansion pieces 2-3, and the expansion pieces in the expansion pieces, and the expansion pieces in the expansion pieces, so that the expansion pieces contact points of the expansion pieces are matched with the expansion pieces 2-3, and the expansion pieces in the expansion pieces. When the anchoring nail section 3 extends into the bone along with the nail body 1, the bone can generate reaction force on the outer wall of the expansion piece 2-3, the outer wall of the expansion piece 2-3 is designed to be a circular arc surface, so that the whole outer wall of the expansion piece 2-3 is in a bullet head shape, the expansion piece is conveniently implanted into the bone, the contact surface with the bone is maximized, the stress concentration of the expansion piece 2-3 in the implantation process is reduced, the friction with the bone is increased, and the deviation or the back of the nail head 2 is prevented.

In this embodiment, as shown in fig. 5, a gap left between adjacent expansion pieces 2-3 is a gap 2-2, and the gap 2-2 is intended to have a certain buffer when the adjacent expansion pieces 2-3 are expanded and deformed, and to ensure the expansion degree of the expansion pieces 2-3.

The length dimension, namely the height dimension, of the expansion piece 2-3 is larger than the length dimension of a single anchor segment 3, after the connecting part 2-1 is connected with the head part of the nail body 1, the expansion piece 2-3 on the connecting part 2-1 covers and exceeds the adjacent anchor segment 3, so that the first anchor segment 3 can smoothly enter the bone under the protection of the expansion piece 2-3, the stability of the head part of the nail body 1 is improved, and the rest part of the nail body 1 can be stably and smoothly implanted into the bone.

The thickness of the root part of the expansion sheet 2-3 is larger than that of the top part of the expansion sheet; the width dimension of the root part of the expansion sheet 2-3 is larger than that of the top part thereof, so that the expansion sheet 2-3 not only has elastic deformation, but also has toughness and cannot be easily broken.

As shown in fig. 4, the number of the expansion pieces 2-3 is three or four, so that when the number of the expansion pieces 2-3 is too small, the expansion pieces 2-3 are not easy to expand when the nail body 1 is pushed to advance, the implantation difficulty is increased, and when the number of the expansion pieces 2-3 is too large, the strength of the expansion pieces 2-3 is difficult to ensure, so that the expansion pieces 2-3 are easy to deform and bend.

The length of the head of the nail body 1 is larger than or equal to that of the connecting part 2-1, so that the connecting part 2-1 of the nail head 2 can wrap the head of the nail body 1, and the nail head 2 is firstly knocked into bone to prevent the head of the nail body 1 from being broken.

3 periphery walls of anchor section are the smooth surface of no line for contact between 3 outer wall sclerotins of anchor section is more laminated, and the minimize clearance exists between the two, does benefit to bone growth healing.

The edges of the anchor sections 3 are all subjected to rounding treatment, so that more bone fragments are prevented from being caused by sharp corners.

In addition, the absorbable material can be processed by biological composite materials such as polylactic acid-glycolic acid copolymer/beta-tricalcium phosphate, polylactic acid-glycolic acid copolymer/hydroxyapatite, polylactic acid-glycolic acid copolymer/beta-tricalcium phosphate/calcium sulfate, polylactic acid/beta-tricalcium phosphate, polylactic acid/hydroxyapatite, polylactic acid/beta-tricalcium phosphate/calcium sulfate, polylactic acid/polylactic acid-glycolic acid copolymer/beta-tricalcium phosphate, polylactic acid/polylactic acid-glycolic acid copolymer/hydroxyapatite and the like.

The using mode is as follows, firstly, the nail head 2 is placed into a bone hole which is punched in advance by using a tool such as an ejector pin, then the nail body 1 connected with an inserter is knocked into the hole, the depth of the nail head 2 and the depth of the whole nail body 1 are controlled by the inserter, the threaded part of the head part of the nail body 1 is contacted with the threaded part of the nail head 2, the head part of the nail body 1 is connected with the nail head 2 by rotating the inserter, the head part is gradually opened by means of threaded fit, an agnail is formed, and the fixing strength is increased.

It should be noted that, in the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Various alterations and modifications will no doubt become apparent to those skilled in the art after having read the above description. Therefore, the appended claims should be construed to cover all such variations and modifications as fall within the true spirit and scope of the invention. Any and all equivalent ranges and contents within the scope of the claims should be considered to be within the intent and scope of the present invention.

Claims (10)

1. The barb type head fixing suture anchor is characterized by comprising an anchor body (1) made of an absorbable material, wherein at least two anchor sections (3) are sequentially overlapped on the outer wall of the anchor body (1) along the axis of the anchor body, the radial size of each anchor section (3) gradually increases from the head to the tail of the anchor body (1), each anchor section (3) extends out from the outer wall of the anchor body (1), a driving groove (1-1) is formed in the center of the anchor body (1) along the axis of the anchor body, a radial through hole (1-3) for a suture to pass through is formed in the side wall of the head of the anchor body (1), a containing groove (1-2) communicated with the radial through hole (1-3) is formed in the outer wall of the anchor body (1) along the axis of the anchor body, the suture is led out along the containing groove (1-2) in the lateral direction of the anchor body (1) after passing through the radial through hole (1-3), and the head of the anchor body (1) is connected with an expansible nail head (2) made of the absorbable material.

2. The barbed head anchor according to claim 1 wherein: the nail head (2) comprises a connecting part (2-1) connected with the nail body (1), one end of the connecting part (2-1) extends out of a plurality of expansion pieces (2-3), the equal distances of the expansion pieces (2-3) and the circumferential distribution of the expansion pieces are distributed on the periphery of an adjacent anchor section (3), a gap is reserved between every two adjacent expansion pieces (2-3) to form an opening (2-2), the inner wall of each expansion piece (2-3) is matched with the peripheral wall of the anchor section (3), and the outer wall of each expansion piece (2-3) is an arc surface.

3. The barbed head anchor according to claim 2 wherein: the expansion sheets (2-3) completely cover an adjacent anchor section (3).

4. The barbed head anchor according to claim 3 wherein: the thickness of the expansion sheet (2-3) is gradually reduced from the root to the top, and the width of the expansion sheet (2-3) is gradually increased from the root to the top.

5. The barbed head anchor according to claim 4 wherein: the number of the expansion sheets (2-3) is three or four.

6. The barbed head anchor according to claim 2 wherein: the outer wall of the head of the nail body (1) is provided with external threads, the central axial direction of the connecting part (2-1) is provided with a through hole, and the inner wall of the through hole is correspondingly provided with internal threads matched with the external threads, so that the threaded connection of the nail body and the connecting part is realized.

7. The barbed head anchor according to claim 6 wherein: the length dimension of the external thread section of the head of the nail body (1) is larger than or equal to that of the internal thread section of the through hole, so that the connecting part is connected with and covers the head of the nail body.

8. The barbed head anchor according to claim 7 wherein: the peripheral wall of the anchor section (3) is a smooth surface without grains.

9. The barbed head anchor according to claim 8 wherein: and the edge of the anchor section (3) is subjected to rounding treatment.

10. The barbed head anchor according to claim 9 wherein: the anchor section (3) is of a circular truncated cone-shaped structure.

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