A medical pad with less fiber drop and a method for manufacturing the same

Abstract

This invention discloses a medical pad that is less prone to fiber shedding and its preparation method. The medical pad is made from polytetrafluoroethylene (PTFE) short fibers through a nonwoven process and a laser perforation process. The preparation steps include using PTFE short fibers as raw materials, opening and carding them, feeding them into a web-laying machine to obtain a loosely structured PTFE fiber layer, then reinforcing it with a needle punch to obtain a PTFE felt sheet, and finally using a laser perforation process to form uniformly distributed through holes on the PTFE felt sheet, ultimately obtaining the medical pad that is less prone to fiber shedding. This medical pad is used in the field of vascular surgery as a pad during vascular suturing. It can seal needle holes and reduce the cutting force of sutures on the vessel wall. Compared with conventional short-fiber felt sheets, the fibers in the medical pad of this invention are less prone to shedding.

Description

Technical Field

[0001] This invention relates to the field of medical supplies, and in particular to a medical pad that does not easily shed fibers and its preparation method. Background Technology

[0002] Vascular surgery typically requires the use of sutures to close blood vessels and stop bleeding. During suturing, insufficient suture force can lead to uncontrollable bleeding, while excessive force can cause the suture to cut into the blood vessel, tearing and deforming the needle puncture site, resulting in leakage. To prevent this, surgeons usually place a medical pad on the outer wall of the blood vessel when using sutures. The suture needle, with the suture attached, first passes through one medical pad before entering the blood vessel tissue. After exiting the blood vessel tissue, the suture needle passes through a second medical pad, ensuring that each suture point has a medical pad. This effectively seals the needle puncture site and distributes the cutting force of the suture on the blood vessel, preventing leakage.

[0003] Existing medical pads are mostly made of polytetrafluoroethylene short fiber felt sheets, which are prone to short fiber shedding. When the shed short fibers fall onto the blood vessel wall, they may cause additional damage to the blood vessel. For example, Chinese patent document CN201821408729, "Surgical pad for microvascular decompression surgery", discloses a medical pad with a cotton-like fiber structure made of polytetrafluoroethylene fibers. It is difficult to avoid the phenomenon of fiber shedding of the surgical pad during the operation.

[0004] Therefore, it is essential to design a medical pad that can be used in vascular surgery, has good softness, seals needle holes, prevents sutures from causing marks on blood vessels, and avoids fiber shedding. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a medical pad that does not easily shed fibers and its preparation method, so as to solve the technical problems mentioned in the background art.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A medical pad that does not easily shed fibers includes a pad body. The pad body is a PTFE felt sheet with a three-dimensional structure and multiple microporous structure formed by sequentially processing polytetrafluoroethylene short fibers through opening, carding, web laying nonwoven processes and needle punching reinforcement. The surface of the pad body is uniformly provided with through holes formed by laser drilling.

[0008] Furthermore, in the above-described invention, the thickness of the gasket body is 500-2200 micrometers.

[0009] Furthermore, in the above-described invention, the through hole is circular, triangular, or rectangular in shape.

[0010] Furthermore, in the above-described invention, the diameter or side length of the through hole is 50-200 micrometers.

[0011] Furthermore, in the above-mentioned invention, the volume ratio of the through hole is 10%-30% of the gasket body.

[0012] Furthermore, in the above-described invention, the porosity of the through hole is 15%-45%.

[0013] A method for preparing a medical pad that does not easily shed fibers, the method comprising the following steps:

[0014] S1. Polytetrafluoroethylene short fibers are used as raw materials for opening and carding, and then fed into a web laying machine for web laying to obtain a loosely structured polytetrafluoroethylene short fiber layer.

[0015] S2. The obtained polytetrafluoroethylene short fiber layer is laminated, then the laminated polytetrafluoroethylene short fiber layer is fed into a pre-needle punching machine for reinforcement, and finally fed into a main needle punching machine for double-sided reinforcement to obtain PTFE felt sheet.

[0016] S3. Using laser drilling technology, uniformly distributed through holes are formed in the PTFE felt sheet to finally obtain a medical pad that is not easy to shed fibers.

[0017] In the above-described invention, further, in step S2, the lamination process involves folding the polytetrafluoroethylene short fiber layer in half or stacking multiple polytetrafluoroethylene short fiber layers.

[0018] The beneficial effects of this invention are:

[0019] This invention provides a medical pad that is resistant to fiber shedding. It possesses considerable strength, providing excellent support and effectively sealing needle holes, preventing blood leakage, and distributing the cutting force of sutures. Furthermore, the polytetrafluoroethylene (PTFE) fiber exhibits good biocompatibility, preventing rejection by the human body. Human tissue cells can differentiate and grow within the micropores of the medical pad, ensuring its stability during long-term use. Finally, this invention utilizes laser perforation technology to create through-holes in the PTFE felt, facilitating needle insertion. It also melts the PTFE fibers, fusing short fibers with other fibers upon cooling, preventing short fiber shedding and avoiding additional harm to the human body. Attached Figure Description

[0020] Figure 1 This is a cross-sectional schematic diagram of the medical pad of the present invention that does not easily shed fibers;

[0021] Figure 2 This is a schematic diagram of the structure of the medical pad that does not easily shed fibers according to the present invention;

[0022] Figure 3 This is another structural schematic diagram of the medical pad of the present invention that does not easily shed fibers.

[0023] In the figure, 1-gasket body, 2-through hole. Detailed Implementation

[0024] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0025] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0026] Example 1:

[0027] A type of medical pad that does not easily shed fibers; please refer to the appendix. Figure 1 - Appendix Figure 3 As shown, it includes a gasket body 1, which is a PTFE felt sheet with a multi-microporous structure formed by sequentially processing polytetrafluoroethylene short fibers through opening, carding, web laying nonwoven processes and needle punching reinforcement. The surface of the gasket body 1 is uniformly provided with through holes 2 formed by laser drilling.

[0028] In the above embodiments, preferably, the thickness of the pad body 1 is 500-2200 micrometers, which ensures that the pad body 1 has good support strength, while also preventing the inconvenience of surgical operation due to excessive thickness of the pad body 1.

[0029] In the above embodiments, preferably, the through hole 2 is circular, triangular or rectangular in shape.

[0030] In the above embodiments, preferably, the diameter or side length of the through hole 2 is 50-200 micrometers.

[0031] In the above embodiments, preferably, the volume ratio of the through hole 2 is 10%-30% of the gasket body, and the porosity of the through hole 2 is 15%-45%, so as to ensure the stability and flexibility of the gasket body 1 structure.

[0032] The medical pad provided by this invention is a non-shedding fiber pad. The pad body 1 is a three-dimensional PTFE felt sheet with a multi-microporous structure formed by sequentially processing polytetrafluoroethylene (PTFE) short fibers through opening, carding, web-laying nonwoven processes and needle-punching reinforcement. PTFE fibers have good biocompatibility and will not cause rejection reactions in the human body. Secondly, human tissue cells can differentiate and grow in the micropores of the pad body 1, making the pad body 1 less prone to movement during long-term use. Thirdly, the pad body 1 has a certain strength during use, providing good support and achieving the functions of sealing needle holes, preventing blood leakage, and distributing the cutting force of sutures. Finally, this invention uses laser punching technology to form through holes 2 on the pad body 1, facilitating needle insertion. During the punching process, PTFE fibers can also be melted, and after cooling, the short fibers are fused together with other fibers, avoiding the phenomenon of short fiber shedding and preventing additional damage to the human body.

[0033] Example 2:

[0034] A method for preparing a medical pad that does not easily shed fibers, the method comprising the following steps:

[0035] S1. Weigh 200g of polytetrafluoroethylene short fibers as raw materials and perform opening and carding treatment. Then feed them into a web laying machine for web laying treatment to obtain a loosely structured polytetrafluoroethylene short fiber layer.

[0036] S2. Fold the obtained polytetrafluoroethylene short fiber layer twice, then feed the folded polytetrafluoroethylene short fiber layer into a pre-needling machine for reinforcement, and finally feed it into a main needle punching machine for double-sided reinforcement to obtain a PTFE felt sheet with a thickness of 2200 micrometers.

[0037] S3. Using laser drilling technology, uniformly distributed circular through holes are formed in the PTFE felt sheet. The diameter of the circular through holes is 50 micrometers, the volume ratio of the circular through holes is 10% of the PTFE felt sheet, and the porosity of the circular through holes is 15%, finally obtaining a medical pad that is not easy to shed fibers.

[0038] Example 3:

[0039] A method for preparing a medical pad that does not easily shed fibers, the method comprising the following steps:

[0040] S1. Weigh 300g of polytetrafluoroethylene short fibers as raw materials and perform opening and carding treatment. Then feed them into a web laying machine for web laying treatment to obtain a loosely structured polytetrafluoroethylene short fiber layer.

[0041] S2. Overlap the three polytetrafluoroethylene short fiber layers obtained in step S1, then feed the overlapped polytetrafluoroethylene short fiber layers into a pre-needling machine for reinforcement, and finally feed them into a main needle-punching machine for double-sided reinforcement to obtain a PTFE felt sheet with a thickness of 500 micrometers.

[0042] S3. Using laser drilling technology, uniformly distributed rectangular through holes are formed in the PTFE felt sheet. The side length of the rectangular through holes is 200 micrometers, the volume ratio of the rectangular through holes is 30% of the PTFE felt sheet, and the porosity of the rectangular through holes is 45%. Finally, a medical pad that does not easily shed fibers is obtained.

[0043] The embodiments described above are merely illustrative of specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A medical pad which is less likely to drop fibers, characterized by, The device includes a gasket body, which is a three-dimensional PTFE felt sheet with a multi-microporous structure formed by sequentially processing polytetrafluoroethylene short fibers through opening, carding, web laying, and nonwoven processes, followed by needle punching reinforcement. The surface of the gasket body is uniformly provided with through holes formed using a laser drilling process; the through holes are circular, triangular, or rectangular in shape; the volume ratio of the through holes is 10%-30% of the gasket body; the thickness of the gasket body is 500-2200 micrometers; the pore diameter or side length of the through holes is 50-200 micrometers; and the porosity of the through holes is 15%-45%. The preparation method of the medical pad is as follows: S1. Polytetrafluoroethylene short fibers are used as raw materials for opening and carding, and then fed into a web laying machine for web laying to obtain a loosely structured polytetrafluoroethylene short fiber layer. S2. The obtained polytetrafluoroethylene short fiber layer is laminated, then the laminated polytetrafluoroethylene short fiber layer is fed into a pre-needle punching machine for reinforcement, and finally fed into a main needle punching machine for double-sided reinforcement to obtain PTFE felt sheet. S3. Using laser drilling technology, uniformly distributed through holes are formed in the PTFE felt sheet to finally obtain a medical pad that is not easy to shed fibers.

2. A method for producing the medical pad according to claim 1, wherein The preparation method includes the following steps: S1. Polytetrafluoroethylene short fibers are used as raw materials for opening and carding, and then fed into a web laying machine for web laying to obtain a loosely structured polytetrafluoroethylene short fiber layer. S2. The obtained polytetrafluoroethylene short fiber layer is laminated, then the laminated polytetrafluoroethylene short fiber layer is fed into a pre-needle punching machine for reinforcement, and finally fed into a main needle punching machine for double-sided reinforcement to obtain PTFE felt sheet. S3. Using laser drilling technology, uniformly distributed through holes are formed in the PTFE felt sheet to finally obtain a medical pad that is not easy to shed fibers.

3. The method of claim 2, wherein the medical pad is prepared by the steps of: In step S2, the lamination process involves folding the polytetrafluoroethylene (PTFE) short fiber layer in half or stacking multiple PTFE short fiber layers.

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