Suture thread with drainage function and surgical suture instrument with this suture thread

Abstract

A suture thread with drainage function, characterized in that the suture thread (1) comprises a suture thread body; a longitudinal drainage channel (10) is formed in the middle or side of the suture thread body, wherein the drainage channel (10) is connected to the puncture channel and serves to drain fluids escaping from the puncture channel and the suture area.

Description

Related registration

[0001] This application claims priority from Chinese Patent Application No. 202510036732.4 filed on January 9, 2025, entitled “Suture thread with drainage function and surgical suturing instrument using the same”. Technical field

[0002] The present invention belongs to the technical field of medical instruments and, in particular, relates to a suture thread with a drainage function and a surgical suture instrument using this suture thread. State of the art

[0003] Suturing is a crucial step in the surgical procedure, with the primary purpose of restoring tissue integrity and promoting wound healing. However, conventional suturing techniques often result in inadequate drainage in the surgical area, which promotes the accumulation of blood and tissue fluid. This can lead to tissue swelling, increase the risk of infection, and prolong patient recovery time.

[0004] Despite the development of numerous technologies and instruments in recent decades aimed at improving suture effectiveness and accelerating patient recovery, including the use of staples, skin adhesives, and suture needles and threads of various shapes and sizes made from different materials, these improvements offer a wider selection for different wound types. However, existing technologies cannot completely prevent the accumulation of blood and tissue fluid in the suture area, which often leads to edema and other complications.

[0005] Therefore, there is an urgent need for a simple, easy-to-use surgical suture instrument with drainage function to overcome the limitations of conventional suture techniques, reduce the risk of complications, and improve postoperative healing efficiency. Description of the invention

[0006] The present invention aims to remedy the existing disadvantages of the prior art by providing a suture thread with a drainage function and a surgical suturing instrument utilizing this suture thread. The integration of a drainage channel into the suture thread enables efficient drainage of tissue fluid in the suture area. This allows suturing and drainage to occur simultaneously, improving postoperative wound management and optimizing the healing process.

[0007] On the one hand, the present invention provides a suture thread with drainage function, that the suture thread comprises a suture thread body; a longitudinal drainage channel is formed in the middle or side of the suture body; The drainage channel is connected to the puncture channel and serves to drain fluids escaping from the puncture channel and the suture area.

[0008] This technical solution ensures that the drainage channel located in the center or on the side of the suture body allows for continuous drainage of wound fluid along the suture thread. This design reduces the amount of blood and tissue fluid that accumulates postoperatively in the suture area, reduces the risk of tissue swelling, and helps prevent infection. Immediate drainage of exudates minimizes fluid accumulation and pressure on the wound edges, thereby reducing inflammatory reactions and the formation of scar tissue. The described suture thread with drainage function is suitable for a wide range of surgical applications, particularly for operations in areas with high fluid secretion or an increased risk of infection, such as abdominal and thoracic surgery.

[0009] Optionally, the structure of the suture thread can be monofilament or multifilament. wherein the monofilament suture thread is provided on its side with an opening which communicates with the drainage channel and the puncture channel and serves to drain fluids from the puncture channel and the suture area into the drainage channel; wherein the multifilament suture thread is connected to one another by a connecting bridge, wherein the connecting bridge runs along the suture thread, wherein the connecting bridge is recessed inwards compared to the adjacent thread surface and serves as a drainage channel and wherein the number of multifilament threads is between 2 and 6.

[0010] By applying the above-mentioned technical concept, the monofilament suture thread is provided with a lateral opening that communicates with the drainage channel and the puncture route. This design allows for effective drainage of exudates from the suture area and the puncture route into the drainage channel. The multifilament suture thread is held together by a connecting bridge, ensuring the individual threads maintain a stable structure. The hollow space created by the connecting bridge forms a drainage path between the individual threads, which is particularly suitable for complex fluid conditions in the surgical field and improves the adaptability of the suture thread. The multifilament design offers a flexible selection of two to six threads.Depending on the specific requirements of the surgical procedure, medical professionals can choose the appropriate number of threads to adapt to different wound sizes and shapes and to achieve an individualized suture solution.

[0011] Optionally, the opening consists either of several openings arranged along the lateral surface of the suture thread or of a longitudinal groove extending along the longitudinal axis of the suture thread and running along its entire length. wherein the opening in the case of a monofilament thread in the form of a longitudinal groove has the opening angles at the edges of the cross-section of the suture thread between 0° and 180°.

[0012] By applying the above-mentioned technical solution, the opening design can include multiple openings arranged along the sides of the suture thread or a longitudinal groove extending along the longitudinal axis of the suture thread and running its entire length. These multiple drainage paths ensure that exudates can be directed to the drainage channel under different surgical conditions. If the opening is designed as a longitudinal groove and the opening angle is greater than 30° and less than 90°, this angle range provides sufficient drainage space to prevent the drainage channel from being closed due to tissue pressure.

[0013] Optionally, the drainage channel runs in the axial direction of the suture body if the suture has a straight shape.

[0014] By applying the above-mentioned technical solution, the drainage channel extends along the longitudinal axis of the suture thread, ensuring drainage along the entire length of the suture thread. This ensures that all areas of the wound are effectively drained.

[0015] Optionally, the edges of the opening of the monofilament thread may have suture wings, the suture wings extending along the longitudinal axis of the suture thread body from one end to the other.

[0016] By applying the above-mentioned technical solution, the suture wings allow the surrounding soft tissue to spread around the suture body, so that the drainage channel is not closed by the pressure of the surrounding soft tissue.

[0017] Optionally, the cross-sectional shape of the drainage channel of a monofilament thread has one of the following shapes: horseshoe, semicircular, square or oval.

[0018] By applying the above-mentioned technical solution, the cross-sectional shape of the drainage channel can be designed in a variety of ways to adapt the drainage performance to different surgical requirements.

[0019] Optionally, the suture thread is made of non-absorbable material and / or bioabsorbable material; the non-absorbable material comprises one or more of the following: nylon, polytetrafluoroethylene (PTFE), polyester fiber, stainless steel, nickel-chromium alloy, titanium and titanium alloys; the bioabsorbable material comprises one or more of the following: polyacetic acid, poly(lactide-co-glycolide) (PLGA), polyhydroxyacetic acid esters, magnesium and magnesium alloys, iron and iron alloys, zinc and zinc alloys.

[0020] By applying the above-mentioned technical solution, the suture thread can be made of non-absorbable and / or bioabsorbable material, thus providing a wide range of materials. Non-absorbable materials offer excellent strength, durability, and biocompatibility and are suitable for surgical procedures that require long-term suture support, such as joint repairs and heart valve fixation. Bioabsorbable materials, on the other hand, gradually degrade in the body and are suitable for applications that do not require permanent suture support, such as skin sutures, muscle repairs, and visceral procedures. This helps reduce postoperative foreign body reactions and the need for a second operation. The flexible material selection allows the suture thread to be adapted to a wide variety of clinical applications and provides precise postoperative support.

[0021] Optionally, the inner and outer surfaces of the suture thread are coated with a hydrophobic coating containing antimicrobials or with a hydrophilic coating containing antimicrobials.

[0022] By applying the above-mentioned technical solution, the inner and outer surfaces of the suture thread are coated with antimicrobial agents. Both hydrophobic and hydrophilic coatings can effectively release these active ingredients to directly target the suture area, inhibit bacterial growth, reduce the risk of postoperative infection, and improve surgical safety and patient recovery.

[0023] On the other hand, the present invention provides a surgical suturing instrument, wherein the suturing instrument comprises a suture needle connected to the suture thread; wherein the suture needle has at least one guide groove; wherein the guide groove serves to relieve the negative pressure created by the needling process and to reduce the resistance of the surrounding tissue to the needle; wherein the surgical suture instrument can use either the suture thread with drainage function according to one of the above-mentioned embodiments or a conventional suture thread.

[0024] By applying the above-mentioned technical solution, the surgical suture instrument is not only compatible with sutures with drainage function, but can also be used with conventional sutures. Medical personnel can select the appropriate suture material according to the type of procedure and individual patient situation, thus implementing a personalized surgical solution and meeting different clinical needs. The guide groove on the suture needle can effectively remove the negative pressure limit of the surrounding tissue on the needle during dynamic piercing, thereby reducing adhesion and friction between the needle body and tissue.

[0025] Optionally, the guide groove is formed longitudinally on the surface of the needle, the guide groove starting from the part of the needle body close to the needle head and running smoothly along the curved surface of the needle and penetrating the needle body to the needle end.

[0026] By applying the above-mentioned technical solution, the smooth guide groove effectively distributes the pressure exerted on the tissue during the insertion process, reducing cutting and compression damage to the tissue. This design contributes to reducing intraoperative bleeding and tissue trauma, promoting postoperative healing, and minimizing the occurrence of complications.

[0027] In summary, the present invention comprises at least the following advantageous technical effects: Firstly, the design of the drainage channel and suture guide groove allow exudates to be drained from the surgical area, thereby reducing the accumulation of blood and tissue fluid, reducing the risk of postoperative infection and edema, and promoting wound healing.

[0028] Second, the multifilament design of the present invention offers a flexible selection of two to six threads. Depending on the specific requirements of the surgical procedure, medical professionals can select the appropriate number of threads to adapt to different wound sizes and shapes and create a customized suture solution.

[0029] Third, the design of the longitudinal groove and suture wings of the present invention ensures that the drainage channel is not closed by the pressure of soft tissue, thus maintaining the continuity and patency of the drainage channel.

[0030] Fourth, the suture according to the present invention can be made of non-absorbable or bioabsorbable material to meet the different durability and biocompatibility requirements of different surgical procedures. Non-absorbable material provides long-term stability, while bioabsorbable material reduces foreign body reaction and reduces the need for a second procedure.

[0031] Fifth, the suture according to the present invention can be coated with a hydrophobic or hydrophilic coating containing antimicrobials and anticoagulants to effectively prevent infection and improve the lubricity of the suture during the suturing process. The hydrophobic coating reduces fluid adhesion, while the hydrophilic coating improves handling properties, thus meeting different postoperative care needs.

[0032] Sixth, the surgical suturing instrument according to the present invention is compatible with both drainage sutures and conventional sutures, providing a flexible solution for surgical procedures. The design of a guide groove reduces the negative pressure exerted by the tissue on the suture needle, thereby increasing the efficiency and precision of the suture. Description of the drawings Fig. 1 is a perspective view of the monofilament suture thread according to Embodiment 1 of the present invention. Fig. 2 is a side view of the monofilament suture according to Embodiment 1 of the present invention. Fig. 3 is a partial photographic illustration of the monofilament suture according to Embodiment 1 of the present invention. Fig. 4 is another partial photographic illustration of the monofilament suture thread according to Embodiment 1 of the present invention. Fig. Figure 5 is a schematic representation of the monofilament suture without drainage channel according to the state of the art in the surgical field. Fig. 6 is a schematic representation of the monofilament suture according to Embodiment 1 of the present invention in the surgical field. Fig. 7 is a perspective view of the monofilament suture according to Embodiment 2 of the present invention. Fig. 8 is a perspective view of the bifilament suture according to Embodiment 3 of the present invention. Fig. 9 is a photographic representation of the bifilament suture according to Embodiment 3 of the present invention. Fig. 10 is a schematic representation of the bifilament suture according to Embodiment 3 of the present invention in the surgical field. Fig. 11 is a perspective view of the trifilament suture according to Embodiment 4 of the present invention. Fig. 12 is a perspective view of a variant of the monofilament suture thread according to Embodiment 4 of the present invention. Fig. 13 is a schematic structural view of the surgical suturing instrument according to Embodiment 5 of the present invention. Fig. 14 is a perspective view of the suture thread according to Embodiment 5 of the present invention. Fig. 15 is a photographic illustration of the surgical suturing instrument according to Embodiment 4 of the present invention.

[0033] The following symbols mean: 1 - suture thread; 10 - drainage channel; 11 - opening; 12 - connecting bar; 13 - suture wing; 2 - transition area; 3 - suture needle; 30 - guide groove. Detailed embodiment

[0034] In order to enable those skilled in the art to better understand the present application, a detailed description is given below with reference to the drawings and embodiments.

[0035] In the description of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be interpreted as indicating relative importance. The term "plural" means two or more unless expressly stated otherwise. The terms "assemble," "connect," "coupled," and "fix" are to be interpreted broadly. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection. "Coupled" can refer to a direct connection or an indirect connection via an intermediate medium. Those skilled in the art will be able to understand the precise meaning of these terms according to the specific circumstances of the present application.

[0036] Throughout the description of this application, terms such as "top," "bottom," "left," "right," "front," and "rear" refer to the positions or spatial orientations shown in the accompanying drawings. These terms are provided for convenience of description only and are not intended to limit the devices or components to any particular direction, structure, or mode of operation. Therefore, they should not be construed as limiting the present application.

[0037] Throughout this application, the term "an embodiment / mode," "some embodiments / modes," or "a specific embodiment / mode" means that a particular feature, structure, material, or property described with respect to that embodiment / mode is included in at least one embodiment / mode of this application. The description of these terms does not necessarily imply that they refer to the same embodiment / mode. Furthermore, the described specific features, structures, materials, or properties may be combined in any suitable manner in one or more embodiments / modes.

[0038] The present invention describes a suture thread with a drainage function and a surgical suturing instrument using this suture thread. The suture thread is provided with a drainage channel running along its length and is used in conjunction with a suture thread. When the suture thread penetrates the skin or muscle tissue, a puncture path is created, which the suture thread follows. The drainage channel drains the exudate from the surrounding puncture path in a timely manner to prevent the accumulation of blood or tissue fluid, reduce postoperative complications, and promote wound healing. Example 1

[0039] As in Fig. As shown in the description, a suture with a drainage function according to the present invention comprises a suture body. A drainage channel 10 is provided in the center or on the side of the suture body, extending along its longitudinal direction. This channel is connected to the puncture path pierced into the tissue by the suture needle and serves to drain fluids (e.g., blood or tissue fluid) from the suture area during surgery to prevent fluid accumulation and resulting complications.

[0040] Suture 1 consists of a monofilament thread and has an opening on its side that communicates with drainage channel 10 and the puncture route. The function of this opening is to drain fluids from the puncture route and the suture area into drainage channel 10, allowing them to be effectively drained to the outside. This reduces the risk of postoperative infection and edema. The opening is designed as a longitudinal groove along the longitudinal axis of suture 1.

[0041] As in Fig. As shown in the description, the opening angle α of the lateral edges of the suture thread 1 in the unloaded, straight state is between 0° and 180°. A smaller angle (close to 0°) can narrow the channel, making it more susceptible to external pressure. A larger angle (close to 180°) improves the openness of the drainage channel but could compromise the overall stability and handleability of the suture. To optimize the drainage performance and structural stability of the suture, the preferred angle range for α is between 30° and 90°. An angle between 30° and 90° improves fluid outflow, minimizes the risk of channel closure due to tissue pressure, and at the same time ensures high mechanical strength and stability of the suture during application.

[0042] The cross-section of the drainage channel can have various shapes, including crescent, semicircle, rectangular, or oval. The selection of the appropriate shape depends on the specific surgical requirements and helps ensure channel patency and effective drainage.

[0043] In this embodiment, the wall thickness of suture thread 1 is 0.2 to 0.5 times the diameter of drainage channel 10. Too little wall thickness may cause the suture to tear due to excessive tensile forces during suturing, while too much wall thickness could compromise the flexibility of the suture and the effectiveness of the drainage channel. A ratio between 0.2 and 0.5 represents a balanced solution to ensure both drainage function and structural integrity. A ratio between 0.3 and 0.4 is particularly recommended, as it provides sufficient tensile strength of the suture while minimizing the risk of suture breakage due to insufficient wall thickness. The wall thickness directly influences the maximum tensile strength of the suture.Controlling the ratio between wall thickness and drainage channel diameter within a range of 0.2 to 0.5 ensures that the suture reliably withstands the tensile forces required for wound closure during use. For surgeries with high strength requirements (e.g., joint repairs or large abdominal incisions), a wall thickness close to 0.5 can be selected to increase tensile strength. For soft tissue procedures or superficial suturing techniques, a wall thickness close to 0.2 is advantageous to improve flexibility and manageability.

[0044] Optionally, the suture material 1 can be made of a non-absorbable material and / or a bioresorbable material. Optionally, the non-absorbable material includes one or more of the following: nylon, polytetrafluoroethylene (PTFE), polyester fiber, stainless steel, nickel-chromium alloy, titanium, and titanium alloys; the bioresorbable material includes one or more of the following: polyacetic acid, poly(lactide-co-glycolide) (PLGA), polyhydroxyacetic acid esters, magnesium and magnesium alloys, iron and iron alloys, zinc and zinc alloys. These materials have a certain mechanical strength to ensure that the suture thread 1 does not swell during use due to the absorption of blood or tissue fluid, and does not deform or twist, which could lead to compression of the drainage channel 10. This ensures unobstructed drainage during the suturing process.When adapting to clinical applications, the material combination is selected depending on the type of surgery (e.g., orthopedics, plastic surgery, gastroenterological surgery) to meet specific mechanical, drainage, and biocompatibility requirements. For example, soft tissue repair (e.g., skin sutures, plastic surgery) requires a suture with good flexibility and biocompatibility, while the drainage channel must prevent postoperative fluid accumulation. Nylon and polytetrafluoroethylene are preferred due to their soft and non-irritating properties, as they are suitable for soft tissue sutures and do not interfere with the tissue's natural healing process. The drainage channel helps keep the incision area dry, reducing the risk of infection and minimizing scarring. For operations in high-risk areas for infection (e.g.,For surgical procedures (e.g., abdominal cavity, genitourinary system), high infection control requirements and possibly a temporary drainage function are required. Resorbable polymer materials such as poly(lactide-co-glycolide) (PLGA) provide temporary support and gradually degrade, thereby reducing foreign body reactions. Titanium alloys are suitable for scenarios with high strength requirements, and the applied antimicrobial coating can significantly reduce the risk of infection. For orthopedic surgeries (e.g., joint repair, fracture fixation), high tensile strength and long-term stability are required to support the biomechanical environment of the bone. Stainless steel and nickel-chromium alloys offer outstanding mechanical strength and biocompatibility, making them suitable for long-term retention.Magnesium alloys, on the other hand, have a faster degradation rate and are ideal for situations where permanent support is no longer required after bone healing. For cardiovascular surgery (e.g., vascular sutures, valve repairs), sutures must exhibit good hemocompatibility, low friction, and high tensile strength to avoid thrombosis and tissue reactions. Polytetrafluoroethylene and polyester fibers are characterized by good flexibility and biocompatibility.

[0045] Optionally, the inner and outer surfaces of suture 1 are coated with a hydrophobic coating containing antimicrobials and anticoagulants, or with a hydrophilic coating containing antimicrobials and anticoagulants. The hydrophobic coating repels water and body fluids, reduces fluid adhesion to the suture surface, and minimizes friction and adhesion between the tissue and the suture. This is particularly suitable for surgical procedures where reducing fluid contact and adhesion is critical, such as suturing in the abdomen, thorax, or joint cavity. The hydrophilic coating, on the other hand, absorbs moisture, increases the lubricity of the suture, and facilitates insertion and suturing, thereby reducing tissue damage. The hydrophilic coating is suitable for high-lubricity suture applications, such as vascular sutures, cardiovascular surgery, and soft tissue repair.

[0046] In this embodiment, the manufacturing process of the suture thread 1 is explained using compression molding and laser cutting: S1: Preparation of the suture raw material: High-purity polypropylene granules or other suitable polymers (such as polytetrafluoroethylene, polyester fibers) are selected to ensure biocompatibility and mechanical properties according to medical standards. The polypropylene granules are dried to remove moisture and prevent blistering or uneven melting during heating. The drying temperature is set at 70°C to 80°C and takes 4 to 6 hours. S2: The dried polypropylene granules are fed into a melting system and heated to 180°C to 220°C until completely melted. During this process, a constant temperature and pressure must be maintained to ensure uniform melting and plasticization of the material. S3: The molten polypropylene is fed into the compression molding die through a screw extrusion system. The die must be precisely designed to match the desired suture structure, including the shape and size of the drainage channel and the longitudinal groove. The extrusion speed of the screw extrusion system is set at 10 to 20 meters per minute, depending on the material properties and suture dimensions, to ensure stable and continuous extrusion. S4: The extruded suture thread immediately enters the stretching phase, where a stretching device installed at the extruder outlet is used to stretch the suture thread unidirectionally or bidirectionally. The stretch ratio is typically in the range of 2 to 5, and the mechanical properties and surface smoothness of the suture thread are optimized by adjusting the stretching speed and stretching temperature. The stretching temperature is maintained between 90°C and 110°C to prevent material embrittlement or breakage caused by excessive stretching. S5: Manufacturing the first guide groove: by compression molding or cutting. In compression molding, the shape of the guide groove is integrated into the mold design, allowing it to be formed synchronously during the extrusion process through precise channels in the mold. In cutting, the guide groove is created by laser cutting after the suture thread is extruded. S6: The stretched suture thread is subjected to rapid cooling in a water bath or air cooling to bring it to room temperature (approximately 20°C to 25°C). The cooling rate must be uniform to avoid deformation or surface defects. The water bath is operated with running water to ensure a stable cooling temperature. S7: After cooling, the suture thread is surface treated. Depending on the application, an antibacterial, antithrombotic, or lubricious coating is applied. Dip coating or spray coating is used to ensure even distribution and effective adhesion of the coating.

[0047] The manufacturing process described above produces the Fig. The suture thread shown in the description is obtained. This suture thread has an integrated drainage channel, while the longitudinal groove extends along the longitudinal axis of the suture thread 1.

[0048] The size of suture thread 1 can be adjusted depending on the surgical area. In this example, suture thread 1 is used, for example, to suture the tibialis anterior muscle.

[0049] As in the Fig. shown in the description, shows Fig. shows a suture without a drainage channel on the tibialis anterior muscle of a New Zealand white rabbit. Fig. shows the suture with the suture thread with drainage channel described in this example. The comparison with the Fig. shows that when using a monofilament suture without a drainage channel, postoperative wound secretion remains entirely within the surgical site, leading to local swelling and inflammatory reactions. In contrast, a suture with an integrated drainage channel allows wound secretion to drain outward along the drainage channel, significantly reducing blood accumulation in the surgical site. This promotes wound healing and minimizes the risk of an inflammatory reaction due to blood congestion. Example 2

[0050] As in Fig. As shown in the description, this embodiment represents a variant of the suture thread. The difference from the first embodiment 1 is that the opening on the side of the suture thread 1 is arranged by a plurality of openings 11 along the side of the suture thread 1, the plurality of openings 11 are arranged along the side surfaces of the suture thread 1 and are connected to the inner drainage channel 10.

[0051] The diameter of each opening 11 is less than half the suture diameter. The exact dimensions can be adjusted depending on the overall diameter of the suture and the area of application. Smaller openings are suitable for low-exudate environments, while larger openings are more suitable for highly exuding wounds or large-area drainage requirements. In one implementation variant, the openings 11 are arranged symmetrically along the longitudinal axis of the suture, with two adjacent longitudinal rows of openings 11 offset from each other. This arrangement ensures uniform drainage across the entire area without compromising the structural strength of the suture.

[0052] Multiple openings 11 provide multipoint drainage, which is particularly suitable for surgical scenarios with uneven exudate distribution, such as deep tissue or multiple exudate sites. Multipoint drainage flexibly adapts to the exudate distribution in the surgical field, effectively reducing fluid accumulation and increasing overall drainage efficiency. The distribution of the openings 11 also reduces the pressure of the suture thread on the surrounding tissue, reducing pain and improving postoperative comfort. Suitable for surgeries requiring distributed drainage. Example 3

[0053] As in Fig. As shown in the description, this variant of the suture thread 1 has a multi-thread structure. The individual threads are connected to one another via connecting webs 12, which run along the suture thread 1. The connecting webs 12 are drawn inward relative to the adjacent thread bodies, creating a groove as a drainage channel 10 for draining the exudate from the surgical wound.

[0054] During the procedure, suture thread 1 is inserted into the tissue along with the suture needle. Because suture thread 1 consists of several individual threads, they can easily spread and minimally widen the puncture path. This design allows fluid to drain from the tissue, reducing the risk of infection after surgery.

[0055] The surgical suture can consist of 2 to 6 suture threads. For example, in one embodiment, the suture consists of two parallel, solid suture threads connected by the connecting bar 12. This suture has a dumbbell-shaped cross-section in the unstressed state. The connecting bar 12 can have various shapes. For example, the upper and lower end surfaces of the connecting bar 12 can be flat or curved.

[0056] It should be noted that the manufacturing process for the suture thread 1 described in this embodiment (melt plasticization of the raw material, extrusion, stretching, cooling and fixing) is identical to the process for the suture thread 1 according to embodiment 1. By exchanging the molds in the extruder, the suture thread 1 according to this embodiment can be manufactured. By this manufacturing process, the Fig. the seam shown in the patent specification.

[0057] The size of suture thread 1 can be adjusted depending on the surgical area. In this example, depending on its thickness and tensile strength, suture thread 1 will be used for suturing mucous membranes, skin, and organs.

[0058] As in the Fig. shown in the description, shows Fig. shows a suture without a drainage channel on the tibialis anterior muscle of a New Zealand white rabbit. Fig. shows the suture with the suture thread with drainage channel described in this example. The comparison with the Fig. shows that when using a monofilament suture without a drainage channel, postoperative wound secretion remains entirely within the surgical site, leading to local swelling and inflammatory reactions. In contrast, a suture with drainage channels on the surface of the suture body allows wound secretion to drain outward along the drainage channel on both sides, significantly reducing blood accumulation in the surgical site. This promotes wound healing and minimizes the risk of an inflammatory reaction due to blood stasis. Example 4

[0059] As in Fig. shown in the description, shows Fig. A variant of embodiment 3, in which the suture 1 consists of three solid suture threads that are fused together. The cross-section of this suture resembles a triangular profile with a curved top. Similar to embodiment 3, the individual suture threads are connected to one another by the connecting web 12, whereby this connecting web 12 is offset inward compared to the adjacent thread surface and forms three drainage channels 10. When the suture 1 is inserted into the tissue with the surgical needle, the three outer edges of the suture threads ensure a slight spreading of the puncture path. This ensures that fluid in the puncture path is efficiently drained via the three drainage channels 10.

[0060] It should be noted that the manufacturing process for the suture thread 1 described in this embodiment (melt plasticization of the raw material, extrusion, stretching, cooling, and fixing) is identical to the process for the suture thread 1 according to embodiment 1. By exchanging the molds in the extruder, the suture thread 1 according to this embodiment can be manufactured.

[0061] The size of the suture thread 1 can be selected according to surgical requirements. This design, depending on its thickness and tensile strength, allows it to be used in various surgical applications, such as suturing mucous membranes, skin, and organs. It not only serves to adapt the wound but also effectively drains wound exudate, thereby accelerating wound healing. Example 5

[0062] As in Fig. shown in the description, shows Fig. A further variant of embodiment 1. In this embodiment, the suture (1) has the same main structure as in embodiment 1; it is designed as a monofilament suture thread. In the center of the suture thread, there is an opening running along its entire length, which serves to drain wound exudate.

[0063] Suture wings 13 are attached to both sides of the opening, extending outward. These wings extend the entire length of the suture thread from one end to the other. Their expanded shape allows for a slight spreading of the surrounding soft tissue, thus creating a larger drainage area. This spreading effect reduces the direct pressure of the suture on the surrounding tissue and minimizes the contact area between the suture thread surface and the tissue.

[0064] A slight depression is formed at the junction between the suture wings (13) and the outer surface of the suture thread. Although this depression is not directly connected to the central opening, it can still function as an additional drainage structure. This design creates a minimal negative pressure environment that supports capillary fluid flow along the suture (1), thus facilitating the removal of exudate. This structure minimizes fluid retention in the sterile field and reduces the risk of infection. Example 6

[0065] As in the Fig. As shown in the description, this invention also describes a surgical suturing instrument. This surgical suturing instrument comprises a suture needle 3 connected to the suture, as well as a transition region 2 connecting the suture to the surgical needle 3.

[0066] On the surface of the surgical needle 3, there are one or more guide grooves 30 running along the longitudinal direction. These guide grooves 30 extend from the needle tip to the needle end. The purpose of the design of the guide grooves 30 is to drain excess fluid, such as leaking blood, during the suturing process and thus prevent fluid accumulation in the surgical area. This helps keep the surgical field clear and does not interfere with the surgical procedure. Furthermore, these guide grooves 30 reduce the negative pressure effect between the surgical needle and the surrounding tissue, thereby facilitating tissue penetration.

[0067] Both conventional suture materials and the surgical sutures equipped with a drainage function described in Examples 1 to 5 can be used as suture material. The use of a suture with a drainage function contributes to the effective drainage of wound exudate during the procedure and reduces postoperative complications.

[0068] The transition area between the suture needle and suture thread is designed to taper gradually from the needle side to the thread side. This design improves the stability of the connection, reduces the sudden transition between the needle body and the suture thread, and prevents blood or tissue fluid leakage due to mismatch at the connection point. The diameter of the transition area is slightly larger than that of the suture thread, allowing the suture thread to pass smoothly through the transition area into the surgical field.

[0069] Optionally, the cross-section of the suture needle 3 can be round, triangular, oval, or spade-shaped. These shapes facilitate secure gripping of the suture needle 3 by the needle holding instrument during surgery and prevent slippage or deflection. Depending on the requirements, the suture needle can be straight or curved, with the curvature being 1 / 4 of a circle, 3 / 8 of a circle, 1 / 2 of a circle, or 5 / 8 of a circle to meet different surgical requirements.

[0070] Optionally, the guide groove (30) can be designed in various arrangements depending on the cross-section of the suture needle 3: one-sided, symmetrical on both sides, on three sides, circumferential, distributed in segments, or as a combination of several of these arrangements. The one-sided arrangement means that the guide groove extends on one side of the suture needle and runs from the needle tip to the needle end. This one-sided arrangement enables efficient drainage of fluids from the surgical area and is suitable for procedures with little drainage requirement. In the symmetrical two-sided arrangement, two guide grooves are arranged in mirror image on both sides of the suture needle along the curvature of the needle. This arrangement increases drainage efficiency, is suitable for operations with high secretion volumes, and ensures balanced drainage to avoid one-sided drainage and uneven fluid flows.The triangular arrangement means that guide grooves are located on three sides of the suture needle. This ensures multi-directional drainage, allowing fluid to be drained regardless of the rotational position of the suture needle during the procedure. In the circumferential arrangement, the guide groove is arranged spirally along the surface of the suture needle, from the needle tip to the needle end. This design allows for continuous drainage during needle insertion, regardless of the direction. The segmented arrangement means that the guide grooves are distributed in sections along the suture needle, with spaces remaining between each segment. This design helps to avoid excessively compromising the structural strength of the needle.In addition, different arrangements can be combined to adapt the guide grooves to specific surgical requirements and the design of the suture needle.

[0071] Method of application of the surgical suture instrument according to this embodiment: Step 1: The needle holder is held with the right hand approximately in the back third of the suture needle, while the left hand picks up the tissue to be sutured with tweezers. Step 2: The needle tip is aligned with the puncture point and inserted vertically into the tissue. External rotation of the wrist rotates the needle holder so that the suture needle follows its curve and exits at the opposite symmetrical point. The choice of suture needle 3 depends on the surgical area and the free space for needle movement: a 3 / 8 circular arc needle is suitable for skin, eyes, blood vessels and nerves, a 1 / 2 circular arc needle can be used for the gastrointestinal tract and muscle tissue, a 5 / 8 circular arc needle is recommended for pelvic and urogenital surgeries, and a complexly curved needle can be used for eye and oral cavity surgeries. Step 3: After the suture needle 3 has pierced the tissue, the transition region 2 is further guided through the tissue. Since the cross-section of the transition region 2 gradually tapers from the suture needle 3 to the suture thread 1, the transition region 2, which runs along the longitudinal axis of the suture needle 3, can pass through the pierced tissue while simultaneously supporting the puncture opening. Step 4: By further pulling the suture needle 3 through the tissue, the suture thread 1 is also guided through the tissue beyond the transition area 2 and remains in the body. The drainage channels 10 in the suture thread 1 drain blood and tissue fluid from the surgical area to the outside along the suture thread 1. The suture thread 1 is then knotted and cut to complete the suture.

[0072] The above-described embodiment is merely illustrative of the invention, and well-known technical features and specific structures have not been explained in detail. It will be apparent to those skilled in the art that the invention is not limited to the detailed description of the above embodiment, but may be embodied in other specific forms as long as the essential spirit or basic characteristics of the invention are retained. Therefore, the embodiments should be regarded as exemplary and not restrictive. The scope of the present invention is determined by the appended claims rather than the above description. It is therefore intended to embrace all changes that come within the meaning and scope of the appended claims.None of the reference signs mentioned in the claims should be considered as a limitation of the respective patent claim. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] CN 202510036732.4

[0001]

Claims

[1] A suture thread with drainage function, characterized by that the suture thread (1) comprises a suture thread body; a longitudinal drainage channel (10) is formed in the middle or side of the suture thread body, wherein the drainage channel (10) is connected to the puncture channel and serves to drain fluids escaping from the puncture channel and the suture area. [2] A suture thread with drainage function according to claim 1, characterized by that the structure of the suture thread (1) is monofilament or multifilament; wherein the monofilament suture thread (1) is provided on its side with an opening which is connected to the drainage channel (10) and the puncture channel and serves to drain fluids from the puncture channel and the suture area into the drainage channel (10); wherein the multifilament suture thread (1) is connected to one another by a connecting web (12), wherein the connecting web (12) runs along the suture thread (1), wherein the connecting web (12) is recessed inwards compared to the adjacent thread surface and serves as a drainage channel (10), and wherein the number of multifilament threads is between 2 and 6. [3] A suture thread with drainage function according to claim 2, characterized by that the opening consists either of a plurality of openings (11) distributed along the outer surface of the suture thread body (1) or of a longitudinal groove which runs along the longitudinal axis of the suture thread body (1); wherein in the case of a monofilament thread in the form of a longitudinal groove, the opening has the opening angles at the edges of the cross-section of the suture thread (1) between 0° and 180°. [4] A suture thread with drainage function according to claim 2, characterized bythat the drainage channel (10) runs in the axial direction of the suture thread body (1) when the suture thread (1) has a straight shape. [5] A suture thread with drainage function according to claim 2, characterized by that the edges of the opening of the monofilament thread (1) have seam wings (13), the seam wings (13) extending along the longitudinal axis of the suture thread body from one end to the other. [6] A suture thread with drainage function according to claim 2, characterized by that the cross-sectional shape of the drainage channel (10) of a monofilament thread has one of the following shapes: horseshoe shape, semicircular shape, square or oval. [7] A suture thread with drainage function according to claim 1, characterized bythat the suture thread (1) consists of non-absorbable material and / or bioresorbable material; the non-absorbable material comprises one or more of the following: nylon, polytetrafluoroethylene (PTFE), polyester fiber, stainless steel, nickel-chromium alloy, titanium and titanium alloys; the bioresorbable material comprises one or more of the following: polyacetic acid, poly(lactide-co-glycolide) (PLGA), polyhydroxyacetic acid esters, magnesium and magnesium alloys, iron and iron alloys, zinc and zinc alloys. [8] A suture thread with drainage function according to claim 1, characterized by that the inner and outer surfaces of the suture thread (1) are coated with a hydrophobic coating containing antimicrobials and anticoagulants, or with a hydrophilic coating containing antimicrobials and anticoagulants. [9] A surgical suturing instrument, characterized byin that the suturing instrument comprises a suture needle (3) connected to the suture thread; wherein the suture needle (3) has at least one guide groove (30); wherein the surgical suture instrument can use either the suture thread with drainage function according to one of claims 1 to 8 or a conventional suture thread. [10] A surgical suturing instrument according to claim 9, characterized by that the guide groove (30) is formed in the longitudinal direction on the surface of the needle (3), the guide groove (30) starting from the part of the needle body which is close to the needle head and running smoothly along the curved surface of the needle and penetrating the needle body to the needle end.

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