Negative pressure drainage system
By designing the drainage tension-reducing tube in the negative pressure drainage system to be inserted deep into the wound and in contact with the dressing layer, the problems of secondary suturing and deep drainage in the traditional negative pressure drainage system are solved, and the primary treatment and healing of deep infection is achieved.
Patent Information
- Application Number
- CN202421914444.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-08
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-08-08
AI Technical Summary
Traditional negative pressure drainage systems require complex secondary sutures, making it difficult to achieve deep drainage and tension relief, leading to inconvenience in the treatment of deep infections.
A negative pressure drainage system was designed, including a dressing layer, a sealing layer and a drainage and tension-reducing tube. The drainage and tension-reducing tube was inserted deep into the wound and contacted with the dressing layer to achieve deep drainage and tension reduction, eliminating the secondary suturing step.
It achieves effective first-stage treatment of deep infection, promotes wound healing, avoids the trouble of second-stage suturing, and improves the convenience and effect of treatment.
Smart Images
Figure CN223350651U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, and in particular to a negative pressure drainage system. Background Art
[0002] Deep infections often involve complex internal structures, including necrotic tissue, fibrotic tissue, and sometimes sinus tracts that are long, narrow, and have numerous branches. Therefore, after deep tissue infection and necrosis, necrotic tissue removal is difficult, and drainage is sometimes poor. Furthermore, deep infections often lead to poor blood supply to the wound surface, secondary to aging of granulation tissue and fibrosis, which in turn causes recurrent wound infection and bacterial biofilm formation, resulting in prolonged wound healing and becoming a major challenge in clinical treatment.
[0003] In most cases, treatment of deep infections relies on dressing changes: after wound exploration, appropriate dressings are applied to adequately drain the cavity and promote the growth of granulation tissue. Traditional dressing changes primarily rely on wet gauze drainage, sometimes supplemented with dry therapies such as local infrared irradiation to promote wound drying. However, when gauze is used to pack deep infections, residual gauze debris can easily form new foreign bodies, causing infection. This can lead to slower healing at the base and faster healing at the top, resulting in false healing and recurrence of deep infection.
[0004] However, when the wound is more serious, such as a severely infected, persistent wound, a complex sinus tract, or a deep wound with residual foreign matter or necrotic tissue that is difficult to remove, surgical treatment is often required. Surgical opening of the wound makes it easier to properly observe, evaluate, and clean the wound, and helps prevent premature closure of the wound edges and the formation of another abscess.
[0005] In recent years, negative pressure sealing drainage has been used as an adjunct to surgery. By employing a two-stage surgical strategy of vacuum-sealed drainage and post-drainage suturing, it improves blood circulation, drains exudate and necrosis, and pulls periwound tissue toward the center, promoting better postoperative wound healing and preventing recurrent infection. Specifically, existing negative pressure sealing drainage materials include medical foam, drainage tubes, medical biopermeable membranes, connectors, connecting tubes, clips, annular adhesive films, and central negative pressure devices. Generally, after routine wound debridement, the foam dressing is cut to the approximate size of the wound and gently placed in the wound. The perforated drainage tube is then placed in the foam, and the foam, the drainage tube, and the surrounding healthy skin are covered with a medical biotranslucent membrane. During this stage, it is important to ensure a good seal between the membrane, the skin, and the drainage tube. Finally, the drainage tube is extended and connected to the negative pressure supply device, and the negative pressure is adjusted to an appropriate level for intermittent irrigation and long-term continuous negative pressure drainage. After the wound heals, the foam and drainage tube are removed, and secondary closure is performed. This negative pressure sealed drainage technique can safely and rapidly heal traumatic soft tissue wounds and infections, and is currently used to treat a variety of difficult-to-heal wounds. However, this technique requires secondary closure, which is extremely inconvenient for the patient. Utility Model Content
[0006] In view of the defects in the existing technology, the purpose of the present invention is to provide a negative pressure drainage system, which solves the problems of the traditional negative pressure drainage system in use, such as the need for complex secondary suturing, difficulty in achieving deep drainage and tension reduction.
[0007] The utility model provides a negative pressure drainage system, comprising:
[0008] A dressing layer, comprising a wound-surface-fitting surface and a negative-pressure sealing surface disposed opposite to each other;
[0009] a sealing layer, the sealing layer covering the negative pressure sealing surface to seal the dressing layer, the sealing layer being provided with a pipeline communicating with the negative pressure device;
[0010] A drainage and tension-reducing tube, wherein the drainage and tension-reducing tube and the wound-conforming surface are located on the same side of the dressing layer; the drainage and tension-reducing tube includes at least two free ends and a main body located between the at least two free ends, the free ends being drainage and tension-reducing guides; the main body is located between the wound-conforming surface and the free ends, and at least a portion of the main body is in contact with the wound-conforming surface or embedded in the dressing layer.
[0011] In one embodiment, the dressing layer is a porous sponge dressing.
[0012] In one embodiment, a sealing gasket is provided on the pipeline, and the sealing gasket is located between the sealing layer and the negative pressure device.
[0013] In one embodiment, the sealing layer is an adhesive sealing film.
[0014] In one embodiment, the drainage and tension-reducing tube is a silicone cross drainage tube.
[0015] In one embodiment, the length direction of the silicone cross drainage tube is consistent with the length direction of the wound-adhering surface.
[0016] In one embodiment, the portion of the main body that contacts the wound-conforming surface or is embedded in the dressing layer is located at the center of the drainage and tension-reducing tube in the length direction.
[0017] Compared with the prior art, the present invention has the following beneficial effects: in the negative pressure drainage system provided by the present invention, the drainage and tension reduction tube is used as an extension of the dressing layer to achieve drainage and tension reduction of the dermis, while eliminating the trouble of removing the drainage strip and suturing in the second stage, and can effectively treat deep infection in the first stage, solving the problem of the limitation of the traditional negative pressure drainage system in the process of using the traditional negative pressure drainage system that requires complicated second stage suturing and is difficult to achieve deep drainage and tension reduction; specifically, when using the negative pressure drainage system provided by the present invention, there is no need to perform suturing after the second stage drainage like the traditional negative pressure closed drainage system, and the drainage can be directly treated in the first stage. After the initial debridement, suturing is performed. By inserting the two ends of the drainage and tension-reducing tube into the deep part of the closed wound, effective deep drainage and tension reduction can be achieved in the later stage, which effectively promotes the healing of deep wounds. After the wound is healed, the negative pressure device is directly removed without the need for a second-stage suturing, which greatly improves the convenience. By inserting the two ends of the drainage and tension-reducing tube into the deep part of the closed wound, with the middle part exposed to the outside and in contact with the dressing layer, it serves as a bridge between the dermis layer of the wound and the negative pressure device, while achieving drainage and tension reduction of the dermis, and achieving a first-stage treatment for deep infection, without the need for a second-stage drainage strip removal and wound closure as in previous negative pressure sealed drainage. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Other features, objects and advantages of the present invention will become more apparent from the detailed description of the non-limiting embodiments with reference to the following drawings:
[0019] Figure 1 This is a schematic structural diagram of the negative pressure drainage system of the present invention;
[0020] Figure 2 To compare the OSAS scores before and after surgery for patients with chronic sinus wounds treated with this new medium-negative pressure drainage system;
[0021] Figure 3 To compare the PSAS scores before and after surgery for patients with chronic sinus wounds treated with the new medium-negative pressure drainage system;
[0022] Figure 4 To measure the scar thickness before and after surgery in patients with chronic sinus wounds treated with the medium negative pressure drainage system of the utility model;
[0023] Figure 5 To evaluate the QOL scores before and after surgery for patients with chronic sinus wounds treated with this new medium-negative pressure drainage system;
[0024] The corresponding relationship between each mark and component name is as follows:
[0025] Dressing layer 1, sealing layer 2, drainage and tension-reducing tube 3, negative pressure device 4, sealing pad 5. DETAILED DESCRIPTION
[0026] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art further understand the present invention, but are not intended to limit the present invention in any way. It should be noted that a person skilled in the art may make various variations and improvements without departing from the scope of the present invention. Such variations and improvements are all within the scope of protection of the present invention.
[0027] Certain directional terms used in the following description of the drawings, such as "inner," "outer," "upper," "lower," "top," "bottom," and other directional terms, will be understood to have their normal meanings and refer to those directions associated with normal viewing of the drawings. Unless otherwise indicated, the directional terms described in this specification are generally in accordance with conventional directions understood by those skilled in the art.
[0028] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.
[0029] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.
[0030] Example 1
[0031] This embodiment provides a negative pressure drainage system, which can be used to treat deep infections while taking into account deep drainage and tension relief, thereby achieving the purpose of effectively treating deep infections in one stage and preventing recurrence.
[0032] Reference Figure 1 As shown, the negative pressure drainage system provided in this embodiment includes:
[0033] Dressing layer 1, comprising a wound-surface-adhering surface and a negative-pressure sealing surface disposed opposite to each other;
[0034] A sealing layer 2, covering the sealing dressing layer 1 on the negative pressure sealing surface, and provided with a pipeline communicating with the negative pressure device 4;
[0035] The drainage and tension-reducing tube 3 and the wound-adhering surface are located on the same side of the dressing layer 1; the drainage and tension-reducing tube 3 includes at least two free ends and a main body located between the at least two free ends, and the free ends are drainage and tension-reducing guide parts; the main body is located between the wound-adhering surface and the free ends, and at least a portion of the main body is in contact with the wound-adhering surface or embedded in the dressing layer 1.
[0036] The dressing layer 1 in this embodiment is a porous sponge dressing. For example, it can be a black porous sponge dressing (3M TM Granufoam TM Dressing; 3M, USA).
[0037] The pipeline in this embodiment is provided with a sealing gasket 5 , which is located between the sealing layer 2 and the negative pressure device 4 .
[0038] The sealing layer 2 in this embodiment is a sticky sealing film. For example, the sealing layer 2 can be a film (3M TM Adhesive sealing film; 3M, USA) with a small round hole in the middle of the film. TM ; 3M, USA) on the sealing film so that the circular hole of the film is centered. TM ; 3M, USA) connected to the negative pressure device 4 (VACULTA TM ; 3M, USA).
[0039] The drainage tension-reducing tube 3 in this embodiment can be a silicone cross drainage tube, the length direction of which is consistent with the length direction of the wound-contacting surface, and the portion of the silicone cross drainage tube that contacts the wound-contacting surface or is embedded in the dressing layer 1 is located at the center position of the length direction of the silicone cross drainage tube.
[0040] When using the negative pressure drainage system in this embodiment, the following steps can be used:
[0041] 1. Clean, debride and disinfect the wound surface.
[0042] 2. According to the shape and size of the wound, trim the drainage and tension-reducing tube 3, dressing layer 1 and sealing layer 2.
[0043] 3. At least two free ends of the drainage and tension-reducing tube 3 are left deep in the wound, and the middle portion of the main body of the drainage and tension-reducing tube 3 is exposed on the surface of the wound.
[0044] 4. The wound-adhering surface of the dressing layer 1 covers the wound and the skin around the wound. The center of the main body of the drainage and tension-reducing tube 3 contacts the dressing layer 1 or is inserted into the dressing layer 1. The sealing layer 2 covers the negative pressure sealing surface of the dressing layer 1 and part of the skin surface to form a sealing structure.
[0045] 5. Start the negative pressure device 4 to perform negative pressure suction treatment.
[0046] The negative pressure drainage system in this embodiment is used to treat patients with infected keloids and deep sinus tracts:
[0047] (1) The efficacy was evaluated from the perspective of pathological scars. The Patient and Observer Scar Assessment Scale (POSAS) score and the pathological scar recurrence rate were evaluated before surgery, 3 months, 6 months, and 1 year after surgery.
[0048] The Patient and Observer Scar Assessment Scale (POSAS) includes the Patient Scar Assessment Scale (PSAS) and the Observer Scar Assessment Scale (OSAS). OSAS and PSAS each have six items, and each item is scored from 1 to 10, so the score range of POSAS is 10-120. For each item, 1 represents the same state as normal skin, and 10 represents the worst case. Specifically, OSAS is objectively evaluated by observers from six dimensions: blood vessels, pigmentation, thickness, softness, looseness and surface area. Three experienced doctors in the inventor's team scored the patients for OSAS, and the average value was taken as the final score. PSAS is subjectively scored by patients based on their perception of six dimensions: pain, itching, color, stiffness, thickness and irregularity. The OSAS scores of the infected pathological scars of the umbilicus before surgery, 3 months after surgery, 6 months after surgery, and 1 year after surgery were 42, 26, 21, and 20, respectively, and the PSAS scores were 45, 17, 13, and 11, respectively. The OSAS scores of the infected pathological scars of the perineum before surgery, 3 months after surgery, 6 months after surgery, and 1 year after surgery were 47, 18, 16, and 16, respectively, and the PSAS scores were 48, 15, 16, and 17, respectively. Figure 2-3 ). It can be seen that after the modified negative pressure aspiration treatment, the patient's pathological scars were significantly improved from both objective and subjective perspectives 3 months after the operation, and the treatment effect remained stable within 1 year after the operation.
[0049] Scar recurrence is considered when the POSAS thickness score is greater than 5 points or the objectively measured thickness is greater than 5mm. We measured the scar thickness before surgery, 3 months after surgery, 6 months after surgery, and 1 year after surgery. The scar thickness of the patient's umbilical infectious pathological scar before surgery, 3 months after surgery, 6 months after surgery, and 1 year after surgery were 6mm, 0, 0, and 0, respectively; the OSAS score of the patient's perineal infectious pathological scar before surgery, 3 months after surgery, 6 months after surgery, and 1 year after surgery were 8mm, 1mm, 1mm, and 1mm, respectively. The patient's pathological scar was stable after surgery and did not recur ( Figure 4 ).
[0050] (2) Efficacy evaluation from the perspective of infection:
[0051] This patient had an infected pathological scar with a deep sinus tract. The efficacy of the treatment was evaluated from the perspective of infection. The frequency of infection episodes was recorded preoperatively and at follow-up visits three months, six months, and one year after surgery. One year before surgery, the patient experienced a cumulative eight infections in the umbilical lesions and six infections in the perineal lesions. Within one year after surgery, the patient's umbilical and perineal lesions remained infection-free. This suggests that modified negative pressure aspiration therapy effectively treated the patient's infection and prevented recurrence.
[0052] (3) Efficacy evaluation from the perspective of quality of life:
[0053] The patient had an infectious pathological scar with a deep sinus tract. Before the operation, the lesions in the umbilicus and perineum caused pain and itching to the patient. The repeated attacks of infection and the unsightly appearance of the lesions brought great inconvenience to the patient's life. Therefore, from the perspective of quality of life, the patient was asked to conduct a subjective assessment of quality of life (QOL) before the operation, 3 months after the operation, 6 months after the operation, and 1 year after the operation. For quality of life, 0 means that the scar has a great impact on life, and 5 means no impact at all. The QOL scores of the patient before the operation, 3 months after the operation, 6 months after the operation, and 1 year after the operation were: 1, 5, 5, 5 ( Figure 5 Through improved negative pressure therapy, the patient's quality of life was greatly improved in the long term 3 months after the operation.
[0054] The negative pressure drainage system in this embodiment cleverly uses a drainage pressure-reducing tube, inserting its two ends into the closed wound with the middle in contact with the dressing layer. The drainage pressure-reducing tube serves as a bridge between the negative pressure and the deep wound surface, thereby achieving drainage and uniform tension reduction of the deep wound surface within the closed incision, without the need to perform the first-stage drainage of the deep wound by placing a drainage strip in the deep wound as before, and then remove the drainage strip and close the wound in the second stage after the wound heals. Therefore, the negative pressure drainage system in this embodiment has obvious advantages for deep infections. Unlike some superficial infected wounds, which can sometimes be treated with a first-stage closed incision negative pressure therapy, such deep infections previously required negative pressure closed drainage and second-stage wound closure to achieve a good treatment effect, which brought great inconvenience to the patient. However, using the negative pressure drainage system in this embodiment, such deep infections can achieve a balance between convenience and effectiveness.
[0055] The negative pressure drainage device in this embodiment simultaneously achieves drainage and decompression of the deep wound surface. Conventional negative pressure suction devices, whether negative pressure sealed drainage or closed incision negative pressure therapy, although both have the function of drainage to treat and prevent infection, often only act on the epidermis to reduce tension. However, if the deep cavity is not sufficiently relieved of tension after lesion resection, deep infection can easily lead to recurrence of deep infection. What's more, excessive tension in the dermis and repeated infection may lead to the formation of pathological scars. Therefore, for the treatment of deep infection, it is also important to reduce the tension of the dermis while achieving infection control. By inserting the two ends of the drainage decompression tube into the closed wound, with the middle in contact with the dressing layer, the drainage decompression tube is used as a bridge between the negative pressure and the deep wound surface, evenly transmitting the negative pressure to the dermis, thereby achieving deep drainage and tension reduction at the same time, thereby effectively treating deep infection.
[0056] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.
Claims
1. A negative pressure drainage system, characterized in that: include: A dressing layer, comprising a wound-surface-fitting surface and a negative-pressure sealing surface disposed opposite to each other; a sealing layer, the sealing layer covering the negative pressure sealing surface to seal the dressing layer, the sealing layer being provided with a pipeline communicating with the negative pressure device; A drainage and tension-reducing tube, wherein the drainage and tension-reducing tube and the wound-conforming surface are located on the same side of the dressing layer; the drainage and tension-reducing tube includes at least two free ends and a main body located between the at least two free ends, the free ends being drainage and tension-reducing guides; the main body is located between the wound-conforming surface and the free ends, and at least a portion of the main body is in contact with the wound-conforming surface or embedded in the dressing layer.
2. The negative pressure drainage system according to claim 1, characterized in that: The dressing layer is a porous sponge dressing.
3. The negative pressure drainage system according to claim 1, characterized in that: The pipeline is provided with a sealing gasket, which is located between the sealing layer and the negative pressure device.
4. The negative pressure drainage system according to claim 1, characterized in that: The sealing layer is a sticky sealing film.
5. The negative pressure drainage system according to claim 1, characterized in that: The drainage tension-reducing tube is a silicone cross drainage tube.
6. The negative pressure drainage system according to claim 5, characterized in that: The length direction of the silicone cross drainage tube is consistent with the length direction of the wound bonding surface.
7. The negative pressure drainage system according to claim 1, characterized in that: The portion of the main body that contacts the wound surface contact surface or is embedded in the dressing layer is located at the center of the drainage and tension-reducing tube in the length direction.