Large mesh hernia repair patch and weaving method thereof

Abstract

The present invention discloses a large mesh hernia repair patch, wherein the structure of the hernia repair patch is a closed three-needle warp satin structure woven from medical-grade polypropylene monofilaments, wherein half of the closed three-needle warp satin structure is a structure of alternating large and small coils in the longitudinal direction and is in a folded line skewed state, and the other half of the structure is a structure of uniform coil sizes and is in a vertical state; in the transverse direction, coils of uniform size and coils of uneven size are arranged alternately. The present invention also provides a method for weaving a large mesh hernia repair patch. The large mesh hernia repair patch and its weaving method provided by the present invention have the advantages of large pore size and small gram weight, and can meet the requirements of physical properties.

Description

Technical Field

[0001] The invention relates to a large-mesh hernia repair patch and a knitting method thereof, and belongs to the technical field of medical products. Background Art

[0002] Hernia patch repair is a surgical method for treating hernia. The operation requires the use of artificial synthetic patches, thus avoiding the tension caused by forcibly pulling together and suturing different anatomical layers. The patch materials used in clinical practice are mostly woven from polypropylene materials because they have the following advantages: (1) soft and more resistant to bending and folding; (2) can be cut to size as needed; (3) more obvious stimulation of fibrous tissue proliferation, large mesh pore size, more conducive to fibrous tissue growth and penetration, easy to be infiltrated by connective tissue, and able to integrate with tissue at an early stage; (4) mild foreign body reaction, no obvious foreign body and discomfort in patients, with very low recurrence rate and complication rate. (5) more resistant to infection, even in purulent infected wounds, granulation tissue can still proliferate in the mesh of the patch without causing mesh corrosion; (6) have higher tensile strength; (7) not affected by water and most chemicals; (8) resistant to high temperatures and can be boiled for disinfection; (9) relatively cheap.

[0003] Research data show that after the patch is implanted in the human body, internal and external granulation tissue (scar tissue) will surround the woven monofilaments of the patch. When the distance between the monofilaments is not wide enough, the mesh will be completely filled with scar tissue (closed-cell), forming scar blocks, causing discomfort to the patient and causing the patch to shrink. Therefore, the mesh needs to be large enough to prevent closed-cell. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a large-mesh hernia repair patch with large pore size and small gram weight and capable of meeting physical performance requirements, and a weaving method thereof.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A large mesh hernia repair patch, the structure of the hernia repair patch is a closed three-needle warp satin structure woven from medical-grade polypropylene monofilaments, wherein half of the closed three-needle warp satin structure is a structure of alternating large and small coils in a folded and skewed state in the longitudinal direction, and the other half is a structure of uniform coil sizes in a vertical state; in the transverse direction, coils of uniform size and coils of uneven size are alternately arranged.

[0007] The porosity of the large mesh hernia repair patch is 83% to 92%, and the weight per unit area is 40 g / m 2 ~80g / m 2 , the tensile breaking strength is 16~20N / cm.

[0008] The medical-grade polypropylene monofilament has a diameter of 0.014 to 0.016 inches.

[0009] The minimum spacing between adjacent longitudinal rows of the hernia repair patch structure is 2 mm and the maximum spacing is 4 mm, and the minimum spacing between adjacent transverse rows is 1.1 mm and the maximum spacing is 3 mm.

[0010] The spacing between the single strands of monofilaments on the large mesh hernia repair patch after forming the fabric is maintained above 1 mm.

[0011] In the alternating structure of large and small coils, the aperture size of the larger coil is 1.4 to 2.3 mm, and the aperture size of the smaller coil is 0.4 to 0.5 mm.

[0012] A method for weaving a large mesh hernia repair patch comprises the following steps: weaving monofilaments on a warp knitting machine, using two combs, wherein the front comb is fully threaded and the rear comb is one threaded and the other empty, the two combs are used to form a closed three-needle warp satin weave, and the directions of the yarn padding are opposite, the longitudinal pulling density is 5.5-6.5 rows / cm, and the transverse density is 7-8 longitudinal rows / cm.

[0013] After the warp knitted structure is finalized, it is cleaned and packaged, and sterilized with ethylene oxide.

[0014] The warp feed of the front comb bar is 2080mm / rack, and the warp feed of the rear comb bar is 1900mm / rack.

[0015] The warp knitting machine has a pulling density of 11 coils / cm and a crimping density of 1900 coils / cm.

[0016] The beneficial effects of the present invention are as follows: the large-mesh hernia repair patch and its weaving method provided by the present invention adopt a special structural design, and more reasonably arrange the distribution and size of the pore size, which has achieved the clinical demand for the effective porosity of the patch product; the pore size is relatively large, and the monofilament spacing of the monofilaments used after forming the fabric is maintained at more than 1 mm, which is conducive to local tissue growth and can effectively avoid the adhesion of scar tissue to form a scar disk; the hernia repair patch has a small gram weight, and after being implanted in the human body, it can reduce the patient's foreign body sensation and has a low risk of causing infection; the mechanical properties of the hernia repair patch meet the requirements of the human body's covering pressure on the patch. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A motion diagram of the padding yarn in a large mesh hernia repair patch of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the coils in the double needle bed warp knitting machine of the present invention. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the protection scope of the present invention.

[0020] The present invention discloses a method for knitting a large mesh hernia repair patch, which adopts a specially designed warp knitting structure. The monofilament adopts medical grade polypropylene monofilament with a wire diameter of 0.014-0.016 inches. On a warp knitting machine with a machine number of 12, two combs are used, the front comb is fully threaded, and the rear comb is one threaded and the other empty. The two combs are made into a closed three-needle warp satin structure, and the padding directions are opposite, which can achieve the requirement of small gram weight. Figure 1 As shown, the yarn numbers of the two comb bars, the front comb bar GB1 and the back comb bar GB2 are as follows: GB1 full wear: 2-3, 1-2, 1-2, 1-0, 2-1; GB2 1 wear 1 empty: 1-0, 2-1, 2-3, 1-2. In addition, the warp knitting machine has a pulling density of 11 coils / cm and a crimping density of 1900 coils / cm.

[0021] In the present invention, at the place where two combs form a loop together, the coils are symmetrically stressed and relatively vertical in the longitudinal direction; at the place where a single comb forms a loop, the coils are regularly skewed in the longitudinal direction due to asymmetrical stress. In vertical longitudinal rows, the coils are evenly stressed and the coils are of the same size. In skewed longitudinal rows, the coils are unevenly stressed and the coils are of different sizes. In order to make more coils with apertures larger than 1.0mm, this is achieved by increasing the difference in the warp feed amount between the empty comb bar and the fully-threaded comb bar, which is manifested in increasing the warp feed amount of the fully-threaded comb bar and reducing the warp feed amount of the empty comb bar. Specifically, the warp feed amount of the front comb bar is 2080mm / rack, and the warp feed amount of the rear comb bar is 1900mm / rack.

[0022] The warp knitted structure adopted by the present invention has a minimum spacing of 2mm and a maximum spacing of 4mm between adjacent longitudinal rows, and a minimum spacing of 1.1mm and a maximum spacing of 3mm between adjacent horizontal rows. This structure can avoid the adhesion of scar tissue to form scar discs, and the spacing between the single strands of fibers used after forming the fabric should be maintained above 1mm, which is beneficial to avoiding the growth of local tissue and not forming scar discs.

[0023] In order to achieve the spacing between adjacent longitudinal rows, weaving is carried out on a warp knitting machine with a machine number of E12; in order to achieve the spacing between adjacent horizontal rows, it is achieved by changing the drawing density; the longitudinal drawing density is 5.5 to 6.5 horizontal rows / cm, and the transverse density is 7 to 8 longitudinal rows / cm.

[0024] After the warp knitted structure is finalized, it is cleaned and packaged, and sterilized by ethylene oxide to prepare a large mesh hernia repair patch.

[0025] The hernia repair patch has half of its longitudinal rows showing alternating large and small coils, and half of its longitudinal rows showing uniform coil sizes. The alternating coil sizes are in a skewed state due to asymmetric force, while the coils in the uniform coil sizes are symmetrically stressed and appear vertical. In the transverse direction, coils of uniform size and coils of uneven size are arranged alternately. The aperture size of the larger coil is 1.4 to 2.3 mm, and the aperture size of the smaller coil is 0.4 to 0.5 mm. The spacing between single strands of monofilament on the hernia repair patch after forming the fabric is maintained above 1 mm, the porosity is 83% to 92%, and the weight per unit area is 40 g / m 2 ~80g / m 2 , the tensile breaking strength is 16~20N / cm.

[0026] like Figure 2 As shown, in order to achieve such a coil structure, the hernia repair patch of the present invention purchases a three-needle closed warp satin structure in the warp knitting structure, wherein 1 / 2 of the coil is formed by two single wires together, and the other 1 / 2 of the coil is formed by a single single wire; wherein 1 / 2 of the extension line is formed by two extension lines forming a cross, and the other 1 / 2 of the extension line is a single extension line.

[0027] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A large mesh hernia repair patch, characterized in that: The structure of the hernia repair patch is a closed three-needle warp satin structure woven from medical-grade polypropylene monofilaments. In the longitudinal direction, half of the closed three-needle warp satin structure is a structure of alternating large and small coils and is in a folded and skewed state, and the other half is a structure of uniform coil sizes and is in a vertical state; in the transverse direction, coils of uniform size and coils of uneven size are arranged alternately, and the spacing between single strands of monofilament on the large mesh hernia repair patch after forming the fabric is maintained at more than 1 mm. The porosity of the large mesh hernia repair patch is 83%-92%, and the weight per unit area is 40g / m 2 ~80g / m 2 , the tensile breaking strength is 16~20N / cm.

2. A large mesh hernia repair patch according to claim 1, characterized in that: The medical-grade polypropylene monofilament has a diameter of 0.014-0.016 inches.

3. The large mesh hernia repair patch according to claim 1, characterized in that: The minimum spacing between adjacent longitudinal rows of the hernia repair patch structure is 2 mm and the maximum spacing is 4 mm, and the minimum spacing between adjacent transverse rows is 1.1 mm and the maximum spacing is 3 mm.

4. The large mesh hernia repair patch according to claim 1, characterized in that: The aperture size of the larger coil in the alternating structure of large and small coils is 1.4~2.3mm, and the aperture size of the smaller coil is 0.4~0.5mm.

5. A method for weaving the large mesh hernia repair patch according to claim 1, characterized in that: The monofilament is woven on a warp knitting machine using two combs, with the front comb fully threaded and the rear comb one threaded and one empty. The two combs make a closed three-needle warp satin structure with the yarn padding in opposite directions. The longitudinal pulling density is 5.5-6.5 horizontal rows / cm, and the transverse density is 7-8 longitudinal rows / cm.

6. The weaving method according to claim 5, characterized in that: After the warp knitted structure is finalized, it is cleaned and packaged, and sterilized with ethylene oxide.

7. The weaving method according to claim 5, characterized in that: The warp feed of the front comb bar is 2080mm / rack, and the warp feed of the rear comb bar is 1900mm / rack.

8. The knitting method according to claim 5, characterized in that: The warp knitting machine has a pulling density of 11 coils / cm and a crimping density of 1900 coils / cm.

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