Medical needle and thread combination and manufacturing method

Abstract

The medical needle and thread combination comprises a needle body and a thread body, a center hole channel is formed in the tail of the needle body, the hole diameter of the center hole channel is smaller than the thread diameter, and the thread diameter is smaller than the needle diameter; the thread body is provided with a needle-thread connecting section fixedly connected with the hole channel; the needle-thread connecting section is inserted into the hole channel when the periphery of the thread body is heated and softened. The manufacturing method comprises the following steps that S1, a single-strand thread body and a needle body with the model 1-2 smaller than that of a conventional configuration are prepared, a center hole is formed in the needle tail, and the hole diameter of the center hole is smaller than the thread diameter; s2, using a heating element to heat the needle body or the needle tail to a temperature higher than the softening temperature of the thread body and slightly lower than the melting point, holding the thread body by hand to insert one end of the thread body into the needle hole by 2-3mm, and completing needle-thread connection.

Description

Technical Field

[0001] The invention relates to a surgical instrument, and in particular to a medical needle and thread combination and a manufacturing method thereof. Background Art

[0002] The medical needle and thread connection in the prior art is that the thread body is inserted into the hole at the tail end of the needle body and then squeezed and fixed by a needle press. The needle threading technology requires that the hole diameter is larger than the thread diameter. Generally, the ratio of the needle diameter to the thread diameter is greater than 2:1, resulting in the thread being unable to block the needle eye. Bleeding from the needle eye is very common, which not only affects the field of vision and increases the difficulty of surgical operation, but also causes chronic blood loss in patients and increases the chance of infection in patients. If a needle 1 to 2 sizes smaller is used, the needle diameter becomes thinner, the aperture decreases, and the ratio of the needle diameter to the wire diameter will be reduced. Combined with the contraction of human tissue, the needle eye can be partially or completely blocked to reduce or prevent bleeding from the needle eye, but the aperture is smaller than the wire diameter, which brings about a problem of needle and thread connection. The Chinese invention patent application with publication number CN116473604A includes a synchronous pulley displacement module, a reverse motion module, a wire release module, a heating module, a pneumatic scissors, a workbench and an electric control box; the pneumatic scissors are located on one side of the reverse motion module, and the wire release module is located on the other side of the reverse motion module. When a section of the suture is heated to a molten state by an electric heating device, it is stretched and retracted and then sheared from the middle, and then solidified to form a needle and thread connection section with a reduced diameter, which is particularly suitable for the end diameter reduction of non-absorbable sutures such as polypropylene, but the processing technology is complicated, and it is particularly not suitable for absorbable sutures such as polydioxanone, which may be related to the thermal elasticity of certain biomaterials.

[0003] Sutures are divided into single strand and multiple strands, and multiple strands are braided strands. In recent years, with the rise of knot-free (barbed) sutures, the use ratio of single strand sutures has increased. For single strand sutures with a certain rigidity, it is necessary to seek other technical approaches. Summary of the invention

[0004] In response to the above problems, on the one hand, the present invention provides a medical needle and thread combination, including a needle body and a thread body, the tail of the needle body having a central channel, the hole diameter of which is smaller than the wire diameter, and the wire diameter is smaller than the needle diameter; the thread body has a needle and thread connecting section, and the needle and thread connecting section is fixedly connected to the channel; the needle and thread connecting section is configured to be inserted into the channel when the periphery of the wire body is softened by heat.

[0005] As a preferred technical solution of the present invention, the wire diameter is 0.27-0.33 mm, and the needle hole diameter is 0.26 mm.

[0006] As a preferred technical solution of the present invention, the wire diameter is 0.34-0.40 mm, and the needle hole diameter is 0.33 mm.

[0007] As a preferred technical solution of the present invention, the wire diameter is 0.41-0.47 mm, and the needle hole diameter is 0.40 mm.

[0008] As a preferred technical solution of the present invention, the wire diameter is 0.48-0.55 mm, and the needle hole diameter is 0.47 mm.

[0009] As a preferred technical solution of the present invention, the wire diameter is 0.56-0.64 mm, and the needle hole diameter is 0.55 mm.

[0010] As a preferred technical solution of the present invention, the needle body is made of stainless steel, and the wire body is a single strand (filament) made of polypropylene PP, polyester PET, polyamide PA, polylactic acid PLA, polyglycolic acid PGA, polydioxanone PPDO, polytrimethylene carbonate PTMC, polyglycolic acid PGLA or poly(glycolide-co-ε-caprolactone) PGCL.

[0011] As a preferred technical solution of the present invention, the hole is provided with a chamfer to facilitate the insertion of the wire.

[0012] As a preferred technical solution of the present invention, the needle and thread connecting section is fixed by extrusion using a needle press machine.

[0013] On the other hand, the present invention also provides a method for making a medical needle and thread assembly, comprising the following steps:

[0014] S1: prepare a single-strand wire and a needle that is 1-2 sizes smaller than the conventional configuration, and the needle tail has a central hole whose hole diameter is smaller than the wire diameter;

[0015] S2: Use a heating element to heat the needle body or needle tail to a temperature above the softening temperature of the wire and slightly below the melting point. Hold the wire and insert one end into the needle hole 2 to 3 mm to complete the needle-wire connection.

[0016] Working principle: When the end of the wire contacts the hole, the periphery of the wire touches the wall and softens due to heat first, and the center has not yet softened. In this state, the wire is squeezed in both directions by the external force and the hole. The center of the wire enters the hole, the wire diameter shrinks, and the peripheral tissue of the wire is deformed to form a shoulder at the hole. At this time, the shoulder diameter is still not larger than the needle diameter, and the needle eye will not be enlarged during subsequent operations.

[0017] Beneficial effects: The present invention uses a needle body that is 1 to 2 sizes smaller than the conventional one, with a thinner needle diameter and a smaller hole diameter, so that the ratio of needle diameter to wire diameter is reduced. Combined with the contraction of human tissue, the needle eye is partially or completely blocked, and the purpose of reducing or preventing bleeding from the needle eye is achieved. At the same time, the needle and thread connecting section is set to be inserted into the hole when the surface of the thread body is heated and softened, which solves the needle and thread connection problem caused by the hole diameter being smaller than the wire diameter. The production method is simple and the production cost is extremely low. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a medical needle and thread assembly of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure of a medical needle and thread assembly of the present invention;

[0020] Figure 3 yes Figure 2 Exploded diagram of . DETAILED DESCRIPTION

[0021] The following is combined with the embodiments and the attached Figures 1 to 3 The invention is further described.

[0022] Example 1

[0023] A medical needle and thread combination comprises a needle body 1 and a thread body 2. The needle body 1 has a hole 3 at the rear end, wherein the hole diameter is smaller than the thread diameter, and the thread diameter is smaller than the needle diameter. The thread body 2 has a needle and thread connecting section 4, which is fixedly connected to the hole 3. The needle and thread connecting section 4 is arranged to be inserted into the hole 3 when the periphery of the thread body 2 is softened by heat, and a shoulder 5 is formed at the end of the needle body 1 after being reduced in diameter by the hole 3. The diameter of the shoulder 5 is smaller than the outer diameter of the needle body 1.

[0024] Example 2

[0025] A method for making a medical needle and thread combination comprises the following steps:

[0026] S1: Prepare a polyester single-strand wire with a wire diameter of 0.40 mm and a stainless steel needle with a tail hole diameter of 0.33 mm;

[0027] S2: Use a heating element to heat the needle to 230-240°C, hold the wire and insert one end into the needle hole 2-3 mm to complete the needle-wire connection.

[0028] Example 3

[0029] A method for making a medical needle and thread combination comprises the following steps:

[0030] S1: Prepare a polydioxanone single-strand wire with a wire diameter of 0.64 mm and a stainless steel needle with a tail hole diameter of 0.55 mm;

[0031] S2: Use a heating element to heat the needle to 105-110°C, hold the wire and insert one end into the needle hole 2-3 mm to complete the needle-wire connection.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A medical needle and thread assembly, characterized in that: It includes a needle body and a thread body, the tail of the needle body has a central hole, the hole diameter of which is smaller than the wire diameter, and the wire diameter is smaller than the needle diameter; the thread body has a needle-thread connecting section, and the needle-thread connecting section is fixedly connected to the hole; the needle-thread connecting section is configured to be inserted into the hole when the periphery of the thread body is softened by heat.

2. A medical needle and thread assembly as claimed in claim 1, characterized in that: The wire body has a diameter of 0.27 to 0.33 mm, and the needle body has a hole diameter of 0.26 mm.

3. A medical needle and thread assembly as claimed in claim 1, characterized in that: The wire body has a diameter of 0.34-0.40 mm, and the needle body has a hole diameter of 0.33 mm.

4. A medical needle and thread assembly as claimed in claim 1, characterized in that: The wire diameter is 0.41-0.47 mm, and the needle hole diameter is 0.40 mm.

5. The medical needle and thread assembly according to claim 1, characterized in that: The wire body has a diameter of 0.48-0.55 mm, and the needle body has a hole diameter of 0.47 mm.

6. A medical needle and thread assembly as claimed in claim 1, characterized in that: The wire body has a diameter of 0.56-0.64 mm, and the needle body has a hole diameter of 0.55 mm.

7. The medical needle and thread assembly according to claim 1, characterized in that: The needle body is made of stainless steel, and the wire body is a single strand (filament) made of polypropylene PP, polyester PET, polyamide PA, polylactic acid PLA, polyglycolic acid PGA, polydioxanone PPDO, polytrimethylene carbonate PTMC, polyglycolic acid lactic acid PGLA or poly (glycolide-co-ε-caprolactone) PGCL.

8. The medical needle and thread assembly according to claim 1, characterized in that: The hole is provided with a chamfer to facilitate the insertion of the wire body.

9. The medical needle and thread assembly according to claim 1, characterized in that: The needle and thread connecting section is squeezed and fixed by a needle pressing machine.

10. A method for making a medical needle and thread assembly, characterized in that: The following steps are involved: S1: prepare a single-strand wire and a needle that is 1-2 sizes smaller than the conventional configuration, and the needle tail has a central hole whose hole diameter is smaller than the wire diameter; S2: Use a heating element to heat the needle body or needle tail to a temperature above the softening temperature of the wire and slightly below the melting point. Hold the wire and insert one end into the needle hole 2 to 3 mm to complete the needle-wire connection.

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