Oral and maxillofacial infection drainage device for tumor patient care

Abstract

This invention discloses a drainage device for oral and maxillofacial infections in cancer patients, relating to the field of postoperative drainage care technology. It includes a fixation base; a dressing fixed to the bottom of the fixation base for adhering to the wound surface; a drainage tube slidably connected to the fixation base and axially retractable; a fluid-filled bladder coaxially disposed inside the drainage tube; a suction tube fixed to the fixation base, having a suction chamber inside; a piston disposed within the suction chamber; and a barrier plate. When using this drainage device for oral and maxillofacial infections in cancer patients, the operator does not need to operate the anti-blocking device separately. Simply observe the healing stage and rotate the knob to align the piston with the corresponding scale to adjust the suction pressure according to the disease progression. The fluid-filled bladder seals the drainage tube, preventing granulation tissue growth and adhesion to the drainage tube, thereby reducing traction pain when the drainage tube is removed.

Description

Technical Field

[0001] This invention relates to the field of postoperative drainage care technology, and more specifically to a drainage device for oral and maxillofacial infections in cancer patients. Background Technology

[0002] Postoperative wounds following oral and maxillofacial tumor resection often form deep cavities with significant exudate, making them susceptible to infection and resulting in a complex healing process. Current drainage techniques have the following shortcomings: traditional negative pressure drainage uses a fixed pressure, which can easily damage newly formed granulation tissue in the mid-to-late stages of healing due to excessive negative pressure, and manual adjustment lacks quantitative standards; the drainage tube opening is easily blocked by rapidly growing granulation tissue, leading to drainage failure and requiring frequent replacement or unblocking, increasing patient suffering and infection risks.

[0003] According to publication number CN115737944A, an integrated drainage and flushing device with anti-clogging function is disclosed, including a flushing fluid storage tank, a control host, and a drainage fluid storage tank. The anti-clogging drainage and flushing component includes a drainage conduit connected to a drainage mechanism and a flushing conduit located inside the drainage conduit and connected to the flushing mechanism. A deformation tube is provided at the end of the drainage conduit, and a deformation channel is provided on the deformation tube. An elastic drive mechanism is provided on the drainage conduit to drive the deformation tube to stretch and deform around the deformation channel as the deformation point. In this invention, the device, through the deformation channel opened on the deformation tube, enables the deformation tube to undergo slight deformation under negative pressure, increasing the relative area of ​​the deformation channel. Furthermore, under the action of the elastic drive mechanism, the deformation tube can be further stretched and deformed, causing a greater degree of misalignment of the blocked deformation channel, thus preventing blockage of the drainage channel.

[0004] However, after oral tumor resection surgery, because the tumor has a large growth space in the maxillofacial region, it occupies the original growth space of tissues, muscles, and blood vessels in the maxillofacial region. After tumor removal, the cavity originally occupied by the tumor cannot be immediately restored, and a large wound cavity will remain for a period of time after surgery. At this time, the amount of bleeding from the wound cavity is large, which can easily form blood clots and cause drainage tube blockage. The aforementioned patent requires external force to stretch the tube body to deform it, and use the misalignment of the tube wall to forcibly "open" the blockage. In the early postoperative period, when the contact surface between the drainage tube and the wound cavity is not tight, it is not a problem. However, as the wound cavity heals, the newly formed granulation tissue wraps around the drainage tube and can easily enter along the first or second fissure on the drainage tube, causing the problem of adhesion between human tissue and drainage tube. At this time, the unblocking operation itself constitutes a secondary irritation to the local tissue. Summary of the Invention

[0005] The purpose of this invention is to provide a drainage device for oral and maxillofacial infections in the care of cancer patients, in order to solve the above-mentioned problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a drainage device for oral and maxillofacial infections in the care of cancer patients, comprising a fixing seat;

[0007] The dressing is fixed to the bottom of the fixing base and used to adhere to the wound surface;

[0008] The drainage tube is slidably connected to the fixed base and can be pulled axially.

[0009] A fluid-filled bladder is coaxially disposed inside the drainage tube;

[0010] A suction tube, fixed to the fixing base, has a suction chamber inside;

[0011] A piston is disposed within the suction chamber;

[0012] A barrier sheet is fixed inside the liquid absorption chamber, and the port of the filling bladder is sealed and fixed to the barrier sheet;

[0013] The liquid space between the piston and the barrier plate is connected to the inner cavity of the filling bladder; the outer wall of the suction tube is provided with graduations.

[0014] It also includes a knob, which is rotated on the suction tube and threaded into the piston to drive the piston to move, compress the liquid space and inflate the filling bladder, while changing the volume of the suction chamber.

[0015] Preferably, a limiting cylinder is fixedly provided on the end face of the piston, and the limiting cylinder extends into or out of the effective working section of the suction chamber as the piston moves.

[0016] Preferably, the drainage tube is externally fixed with a support rib, and the support rib is provided with clips at intervals along the axial direction.

[0017] Preferably, the fixing seat is provided with an elastic blocking member, and the locking member can engage with the elastic blocking member to fix the drainage tube.

[0018] Preferably, the interior of the support rib is provided with a flushing channel along its axial direction, and the fixing seat is provided with a liquid inlet pipe for connecting an external flushing device, the liquid inlet pipe being connected to the flushing channel.

[0019] Preferably, the card has a rinsing port that communicates with the rinsing channel.

[0020] Preferably, the flushing port is angled and the spray direction is axial towards the drainage tube.

[0021] Preferably, the dressing has a spiral disc structure with raised strips in the coil gaps.

[0022] Preferably, the fixing seat is fitted with a retractable folding tube to cover the portion of the drainage tube that is pulled out from the fixing seat.

[0023] Preferably, the drainage tube has a drainage port with a diameter that increases along the drainage direction.

[0024] In the above technical solution, the oral and maxillofacial infection drainage device for tumor patients provided by the present invention has the following beneficial effects: the operator does not need to operate the anti-blocking device separately, but only needs to observe according to the healing stage and rotate the knob to make the piston align with the corresponding scale, so as to adjust the suction pressure according to the disease course, and seal the drainage tube inside the drainage tube through the filling bladder to prevent the growth of granulation tissue and adhesion to the drainage tube, thereby reducing the traction pain caused to the patient when the drainage tube is removed. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0026] Figure 1 This is a schematic diagram of a mid-healing lateral section provided in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the lateral section during the early healing stage provided in an embodiment of the present invention;

[0028] Figure 3 This is an overall three-dimensional schematic diagram provided for an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the overall three-dimensional interior provided for an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the suction tube and piston structure provided in an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the dressing structure provided in an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the fixing base structure provided in an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the drainage tube and drainage port structure provided in an embodiment of the present invention;

[0034] Figure 9 A cross-sectional view of the drainage tube and drainage port provided in an embodiment of the present invention;

[0035] Figure 10Provided for embodiments of the present invention Figure 1 Enlarged schematic diagram of structure A in the middle.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Fixing base; 2. Adhesive; 21. Raised strip; 3. Drainage tube; 31. Drainage port; 4. Filling bladder; 5. Suction tube; 51. Suction port; 52. Suction chamber; 6. Piston; 7. Barrier plate; 8. Limiting cylinder; 9. Knob; 10. Folding tube; 11. Support rib; 12. Clip; 13. Elastic blocking component; 14. Flushing channel; 15. Flushing port; 16. Inlet tube. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] like Figure 1-10 As shown, a drainage device for oral and maxillofacial infection in cancer patients includes a fixation base 1;

[0040] Apply patch 2, which is fixed to the bottom of the fixation base 1, to adhere to the wound surface;

[0041] Drainage tube 3 is slidably connected to fixed base 1 and can be pulled axially.

[0042] The fluid-filled bladder 4 is coaxially disposed inside the drainage tube 3;

[0043] A suction tube 5 is fixed to a mounting base 1 and has a suction chamber 52 inside.

[0044] Piston 6 is disposed within the suction chamber 52;

[0045] The barrier sheet 7 is fixed inside the liquid absorption chamber 52, and the port of the filling bladder 4 is sealed and fixed to the barrier sheet 7;

[0046] The liquid space between the piston 6 and the baffle 7 is connected to the inner cavity of the filling bladder 4; the outer wall of the suction tube 5 is marked with graduations.

[0047] It also includes a knob 9, which is rotated on the suction tube 5 and threadedly engaged with the piston 6, used to drive the piston 6 to move to compress the liquid space and inflate the filling bladder 4, while changing the volume of the suction chamber 52.

[0048] Specifically, such as Figure 3 , Figure 6 and Figure 7 As shown, the fixing base 1 is a rigid or semi-rigid component that serves as the core of the structure, preferably made of biocompatible medical-grade polycarbonate (PC) or acrylonitrile. butadiene The styrene copolymer (ABS) is integrally molded using an injection molding process. Its main body is cylindrical or square-shaped, with a central channel inside for the drainage tube 3 to pass through. The bottom end of the fixing base 1 is designed with an outwardly expanding annular mounting flange for securely connecting the dressing 2. The piston 6 is axially slidably disposed within the suction tube 5, and a keyway structure can be provided within the suction tube 5 to restrict the rotation of the piston 6.

[0049] Furthermore, the filling bladder 4 is a thin-walled cylindrical silicone capsule that forms an independent, annular, closed space surrounding the lumen inside the drainage tube 3. In the initial unfilled state, the filling bladder 4 is deflated, with a large distance between it and the tube wall, and has no impact on the drainage channel.

[0050] The suction tube 5 is fixedly installed at the end of the drainage tube 3, and a suction chamber 52 is formed inside the suction tube 5. A suction port 51 is provided at the tail end of the suction tube 5. The suction port 51 can use a standard Luer connector and be connected to an external negative pressure source, such as a central negative pressure system in the ward or a portable electric negative pressure pump. A barrier plate 7 (e.g., ...) is fixedly installed inside the suction chamber 52. Figure 5 As shown, the center of the barrier plate 7 is sealed and connected to the port tubing of the filling bladder 4, which extends from inside the drainage tube 3. A piston 6 fits within the suction chamber 52 and can slide within it. The cavity between the piston 6 and the barrier plate 7 is filled with sterile saline and communicates with the inner cavity of the filling bladder 4, thus forming a closed hydraulic transmission system.

[0051] The knob 9 is rotatably mounted on the suction tube 5 via a bearing or a sliding sleeve. The inner wall of the knob 9 has an internal thread that mates with the external thread on the piston rod of the piston 6. The tube body of the suction tube 5 is made of a transparent material such as polycarbonate, and the outer wall is printed with graduations representing three healing stages: "early healing", "intermediate healing" and "late healing".

[0052] When the wound is in the early postoperative period (pre-healing stage, i.e., days 1-3), there is a large amount of exudate, requiring high negative pressure drainage, and granulation tissue has not yet grown. At this time, the operator turns knob 9 so that piston 6 reaches the "pre-healing" mark. Piston 6 is located in the starting position away from the barrier plate 7 (e.g., Figure 2 (As shown). At this time, the fluid volume of the closed hydraulic system is at its maximum, the filling bladder 4 is in a deflated state, and the drainage tube 3 channel is fully open. At the same time, the volume available for creating negative pressure in the suction chamber 52 is at its maximum. Under constant suction from an external negative pressure source, the actual negative pressure value acting on the wound is the highest, achieving efficient drainage.

[0053] When healing enters the mid-stage (approximately 4-7 days post-surgery), exudate decreases, and granulation tissue begins to grow actively, posing a risk of clogging the drainage tube. Excessive negative pressure can also damage the newly formed tissue. At this point, the operator turns knob 9, bringing piston 6 to the "mid-healing" mark. Piston 6 moves towards the barrier plate 7, compressing the liquid space between them and forcing a measured amount of saline solution through the tubing into the filling bladder 4, causing it to expand moderately. The expanded filling bladder 4 forms a physical barrier, effectively preventing the forward-growing granulation tissue from intruding into the drainage tube 3 and increasing the flow resistance within the drainage tube 3, thus reducing the negative pressure and minimizing interference with the growing granulation tissue. At this stage, due to the reduced exudate during healing, the actual drainage flow rate required also decreases accordingly, and the expansion of the filling bladder 4 reduces the cross-sectional area of ​​the drainage channel, aligning with the actual flow rate change.

[0054] As the wound enters the late healing stage (days 7-10), the cavity gradually shrinks and granulation tissue becomes more prominent, requiring even lower negative pressure to maintain patency and prevent blockage. Rotate knob 9 to bring piston 6 to the "late healing stage" setting, moving piston 6 to its furthest point. At this point, more fluid is forced into the filling bladder 4, causing it to fully expand and completely fill the drainage tube 3, fundamentally preventing adhesion between granulation tissue and the tube wall. When finally removing the tube, the bladder deflates, allowing for easy removal and avoiding tearing, bleeding, and severe pain caused by forcibly detaching tissue that has grown into the tube lumen.

[0055] In the above technology, the operator does not need to operate the anti-blocking device separately. He only needs to observe the healing stage and rotate the knob 9 to make the piston 6 align with the corresponding scale. This allows the operator to adjust the suction pressure according to the course of the disease. The fluid-filled bladder 4 seals the inside of the drainage tube 3 to prevent the growth of granulation tissue and its adhesion to the drainage tube 3, thereby reducing the traction pain caused to the patient when the drainage tube 3 is removed.

[0056] As a further embodiment of the present invention, a limiting cylinder 8 is fixedly provided on the end face of the piston 6, and the limiting cylinder 8 extends into or out of the effective working section of the suction chamber 52 as the piston 6 moves.

[0057] Specifically, the limiting cylinder 8 is a cylinder coaxial with the piston 6 and with a diameter smaller than the inner diameter of the suction chamber 52. It moves as an integral part of the piston 6. When the piston 6 is in different positions, the limiting cylinder 8 extends into the suction chamber 52 to create a negative pressure space. As the limiting cylinder 8 gradually extends into the suction chamber 52, an annular fluid channel is formed between the outer wall of the limiting cylinder 8 and the chamber wall. The deeper the limiting cylinder 8 extends, the narrower this fluid channel becomes, and the greater the system flow resistance.

[0058] When piston 6 is in the "pre-healing stage", the limiting cylinder 8 has not extended into the effective working section of the suction chamber 52. At this time, the volume of the suction chamber 52 that can be used to form negative pressure is the largest. Under constant suction from an external negative pressure source, the actual negative pressure value acting on the wound is the highest, which quickly removes necrotic tissue, hematoma and a large amount of inflammatory exudate from the wound cavity.

[0059] When piston 6 is in the "mid-healing" stage, the fixed limiting cylinder 8 extends deeper into the suction chamber 52. Since the negative pressure is generated by aspirating the liquid within the suction chamber 52, the intrusion of the limiting cylinder 8 substantially reduces the volume of the chamber. This makes the negative pressure response more sensitive while maintaining the same external suction power. Simultaneously, the liquid must flow through the narrow annular gap formed by the limiting cylinder 8 and the chamber wall, increasing flow resistance and preventing excessive suction force from damaging the newly formed, fragile granulation tissue.

[0060] When piston 6 is in the "late healing stage," the limiting cylinder 8 extends to its maximum extent, minimizing the effective negative pressure chamber volume. The long annular gap creates extremely high flow resistance, resulting in an exceptionally smooth negative pressure waveform applied to the wound surface. This provides a gentle and undisturbed environment for epithelial cell migration and eventual wound closure.

[0061] As a further embodiment of the present invention, a support rib 11 is fixedly provided on the outside of the drainage tube 3, and the support rib 11 is provided with clips 12 at intervals along the axial direction.

[0062] Specifically, the support rib 11 and the drainage tube 3 are integrally formed through a co-extrusion process, which not only increases the axial stiffness of the drainage tube 3, making it less prone to twisting and bending in deep cavities, but also provides clamping members 12 at fixed intervals along the axial direction of the support rib 11, each clamping member having an inclined surface. On the inner wall of the central slide of the fixing seat 1, elastic blocking members 13 (such as...) are embedded or molded in a circumferential array on the center slide wall. Figure 7 (As shown). The elastic blocking member 13 may be a flat elastic plastic latch for locking, and the side is connected to the inside of the fixing base 1 through an elastic element, or it may be one or more O-rings made of medical silicone. The inner diameter of the elastic blocking member 13 is slightly smaller than the outer diameter of the locking member 12.

[0063] In the early postoperative period, when the cavity is at its deepest, the drainage tube 3 is inserted at its deepest point. At this time, the first locking piece 12 near the fixation base 1 may be stuck at the elastic blocking piece 13. As time progresses, the wound cavity shrinks due to granulation tissue growth. To prevent the drainage tube 3 from occupying the normal growth space of the wound cavity, medical staff need to pull the drainage tube 3 outwards by a certain length. At this time, the inclined surface of the locking piece 12 will compress the elastic blocking piece 13, causing it to undergo elastic deformation, thus allowing it to slide past the elastic blocking piece 13. When the pulling force is removed and the drainage tube 3 reaches the new predetermined position, the elastic blocking piece 13 rebounds under its own elastic restoring force, forming a tight fit with the vertical surface of the locking piece 12, thereby locking the drainage tube 3 and preventing it from accidentally retracting or sliding in during negative pressure suction or patient movement. The spacing between each locking piece 12 represents an adjustment unit, providing a quantitative basis for depth adjustment, making the operation intuitive and reliable.

[0064] As a further embodiment of the present invention, a flushing channel 14 is provided inside the support rib 11 along its axial direction, and an inlet pipe 16 for connecting an external flushing device is provided on the fixing base 1, the inlet pipe 16 being connected to the flushing channel 14.

[0065] Specifically, an opening can be made in the support rib 11, allowing irrigation fluid to be delivered into the inlet tube 16. The irrigation fluid then flows directly through the irrigation channel 14 to irrigate the wound. The inlet tube 16 is equipped with a standard infusion connector for connecting to an external pulse irrigation pump or infusion bag. In the early postoperative period, the wound cavity is deep and contains a lot of blood, making it prone to coagulation and potential blockage of the drainage tube 3 by blood clots. The irrigation channel 14, using high-intensity pulses, disperses large blood clots, preventing tissue adhesion. At this time, the irrigation fluid flow is high, while the filling bladder 4 is deflated, maximizing the gap between the drainage tube 3 and the filling bladder 4, ensuring smooth drainage and preventing fluid accumulation in a short period.

[0066] As a further embodiment of the present invention, the card 12 is provided with a rinsing port 15 that communicates with the rinsing channel 14.

[0067] Specifically, the flushing port 15 is opened at an angle and the spray direction is directed towards the axial direction of the drainage pipe 3.

[0068] Furthermore, the axis of the irrigation port 15 forms an acute angle (e.g., 30°-60°) with the axis of the drainage tube 3, and its spray direction points towards the axial direction of the drainage tube 3, specifically towards the depth of the wound cavity. Since the irrigation port 15 is located on each of the axially distributed locking pieces 12, regardless of which locking position the drainage tube 3 is pulled to (i.e., the position where the locking piece 12 engages with the elastic blocking piece 13), one or more locking pieces 12 and their irrigation ports 15 located in the current tube segment will always remain in their effective working position within the wound cavity. When the drainage tube 3 is pulled out, the new front end area still has locking pieces 12 and irrigation ports 15. The irrigation fluid is injected from the inlet tube 16, flows through the irrigation channel 14 within the support rib 11, and finally sprays out from the oblique irrigation ports 15 on the few effective locking pieces 12 closest to the bottom of the wound cavity. The irrigation fluid is directly guided through the irrigation ports 15 to the deeper areas of the wound cavity and the front end wall of the drainage tube 3, flushing the areas where blood clots are most likely to accumulate. It can also help to disturb and loosen viscous exudate or necrotic tissue attached to the tissue, thus enhancing the debridement effect.

[0069] As a further embodiment of the present invention, the patch 2 has a spiral disc structure and the coil gap is provided with protrusions 21.

[0070] Specifically, the dressing 2 is formed by spirally winding a medical-grade silicone strip with a width of approximately 5-8 mm from the center outwards, with a thickness of approximately 1-2 mm. The raised strips 21 are basically flush with or slightly lower than the upper surface of the silicone strip, and they are made of a highly absorbent and highly adhesive medical hydrogel material (such as polyvinyl alcohol gel or sodium polyacrylate gel).

[0071] When fixed to the curved or irregular skin surfaces commonly seen post-operatively, the dressing 2 can undergo micro-deformation locally like a spring, better conforming to bony prominences (such as the lower edge of the mandible) or soft tissue depressions, significantly reducing leakage points caused by uneven adhesion. Furthermore, the gel-material protrusions 21 fill the gaps between the silicone strips, forming a continuous adhesive layer. The hydration of the gel with the stratum corneum generates strong wet adhesion with minimal skin irritation, making it suitable for long-term application. Simultaneously, the spirally coiled gel protrusions 21 absorb trace amounts of tissue fluid seeping from the wound edges, keeping the contact interface dry and further enhancing the reliability of the seal.

[0072] Furthermore, the raised strips 21, made of hydrogel material, have significantly lower mechanical strength than the silicone strips on both sides. This allows the raised strips 21 to form predetermined fracture paths within the dressing 2. Traditional high-adhesion medical dressings require overcoming the strong adhesion between the dressing and the skin during removal, often using a rapid tearing method, which can easily cause severe pain and even tear the fragile skin around the wound that has not fully healed, bringing additional pain and fear to the patient. In this invention, when the dressing 2 needs to be removed or replaced, medical staff or patients can pinch the edge of the silicone strip from the outermost ring or a specific position of the dressing 2, and then peel the dressing 2 along the spiral trajectory of the raised strips 21. Because the material of the raised strips 21 is easier to tear or separate from the skin, the entire tearing process has less resistance, is gentler, and reduces the pulling force on the skin's stratum corneum, significantly reducing pain and the risk of skin damage during removal.

[0073] As a further embodiment of the present invention, the fixing seat 1 is fitted with a retractable foldable tube 10 to cover the portion of the drainage tube 3 that is pulled out from the fixing seat 1.

[0074] Specifically, to prevent unsterilized tube segments from remaining outside the fixation base 1 after the drainage tube 3 is withdrawn, a retractable folding tube 10 is fixedly sleeved above the fixation base 1. The folding tube 10 has an accordion-bellows-shaped transparent corrugated tube structure (e.g., Figure 3 (As shown) and possesses a certain degree of elasticity, the folded tube 10 is in a compressed state by default, acting as a tension spring and applying an axial elastic force to the drainage tube 3. This elastic force must be overcome during the withdrawal of the drainage tube 3 to ensure that the locking member 12 is immediately pressed into the engaging position after passing the elastic blocking member 13. When the drainage tube 3 is withdrawn, the folded tube 10 extends accordingly, always completely covering the exposed portion of the drainage tube 3; when the drainage tube 3 is pushed inward, the folded tube 10 is compressed. Both ends of the folded tube 10 are airtightly connected to the outer wall of the fixing base 1 and a section of the drainage tube 3, respectively, thus ensuring a completely sealed drainage path from the inside of the wound cavity to the external negative pressure source, maintaining the integrity of the negative pressure system, and effectively isolating the external environment.

[0075] As a further embodiment of the present invention, the drainage tube 3 is provided with a drainage port 31 whose diameter increases along the drainage direction.

[0076] Specifically, when the drainage tube 3 is partially withdrawn due to the shallowing of the wound cavity, the drainage port 31, which was originally at the forefront of the working section, may exit the wound cavity. At this time, the new forefront drainage port 31 is the next group with a slightly smaller diameter. This gradient design of the diameter ensures that no matter what depth the drainage tube 3 is adjusted to, the front drainage port 31 of its effective working section is always a relatively small diameter, which is beneficial for precise drainage and reduces the risk of tissue aspiration.

[0077] Furthermore, during the mid and late stages of healing, a section of the drainage tube 3 is withdrawn, meaning that multiple larger drainage ports 31 are initially covered by the folded tube 10. This allows the portion of the drainage tube 3 near the fixation base 1 to communicate with the interior of the folded tube 10. At this time, the irrigation fluid, after flowing out from the irrigation port 15, first accumulates inside the folded tube 10 and then flows back into the drainage tube 3 along the drainage ports 31, rinsing the end of the drainage channel (i.e., the portion near the suction chamber 52) to prevent hemostasis (such as...). Figure 10 (As shown). Furthermore, the inside of the folded tube 10 at this time is equivalent to a buffer chamber. The volume of the folded tube 10 expands the actual volume of the end section of the drainage channel. In the instant of strong flushing or a sudden increase in drainage flow, the excess liquid can be temporarily stored in the buffer chamber, providing flow redundancy for the system.

[0078] Working principle: In the early postoperative period (days 1-3, i.e., the pre-healing stage), the tip of drainage tube 3 is placed at the deepest part of the cavity after mandibular bone resection. The gel side of dressing 2 is applied to the skin around the sutured neck wound and pressed to ensure a tight seal. Connect the fixation base 1.

[0079] Confirm that piston 6 is at the "pre-healing" mark. At this time, the inflation bladder 4 is not inflated, all drainage ports 31 are open, and the negative pressure is at its highest setting. Connect the suction tube 5 to the negative pressure pump and the inlet tube 16 to the saline flushing pump.

[0080] Mid-healing stage (approximately day 4-5). At this time, adjust piston 6 to the "mid-healing" mark. The fluid-filled bladder 4 begins to expand, partially sealing the foremost drainage port 31, establishing initial anti-blockage; simultaneously, the working negative pressure automatically decreases, reducing suction damage to the newly formed granulation tissue.

[0081] As the wound enters the later healing stage (days 7-10), the wound cavity gradually shrinks and granulation tissue becomes more prominent, requiring even lower negative pressure to maintain patency and prevent blockage. Rotate knob 9 to bring piston 6 to the "late healing stage" setting, moving piston 6 to its furthest point. At this point, more fluid is forced into the filling bladder 4, causing it to fully expand and achieve a more thorough closure of the tube opening, preparing to remove the entire device (including drainage tube 3) from the wound cavity.

[0082] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A drainage device for oral and maxillofacial infections in the care of cancer patients, characterized in that, include: Fixed base (1); The dressing (2) is fixed to the bottom of the fixing seat (1) and used to adhere to the wound surface; The drainage tube (3) is slidably connected to the fixed base (1) and can be pulled axially. The fluid-filled bladder (4) is coaxially disposed inside the drainage tube (3); A suction tube (5) is fixed to the fixing base (1) and has a suction chamber (52) inside. Piston (6) is disposed in the suction chamber (52); The barrier sheet (7) is fixed inside the liquid absorption chamber (52), and the port of the filling bladder (4) is sealed and fixed to the barrier sheet (7). The liquid space between the piston (6) and the barrier plate (7) is connected to the inner cavity of the filling bladder (4); the outer wall of the suction tube (5) is provided with graduations; It also includes a knob (9), which is rotated on the suction tube (5) and threadedly engaged with the piston (6) to drive the piston (6) to move to compress the liquid space and inflate the filling bladder (4), while changing the volume of the suction chamber (52).

2. The oral and maxillofacial infection drainage device for cancer patients according to claim 1, characterized in that, The piston (6) is fixedly provided with a limiting cylinder (8) on its end face, and the limiting cylinder (8) extends into or out of the effective working section of the suction chamber (52) as the piston (6) moves.

3. The oral and maxillofacial infection drainage device for cancer patients according to claim 1, characterized in that, The drainage tube (3) is externally fixed with a support rib (11), and the support rib (11) is provided with clips (12) at intervals along the axial direction.

4. The oral and maxillofacial infection drainage device for cancer patients according to claim 3, characterized in that, The fixing seat (1) is provided with an elastic blocking member (13), and the clamp (12) can engage with the elastic blocking member (13) to fix the drainage tube (3).

5. A drainage device for oral and maxillofacial infections in the care of cancer patients according to claim 3, characterized in that, The support rib (11) has a flushing channel (14) arranged along its axial direction inside, and the fixing seat (1) is provided with an inlet pipe (16) for connecting an external flushing device. The inlet pipe (16) is connected to the flushing channel (14).

6. A drainage device for oral and maxillofacial infections in the care of cancer patients according to claim 5, characterized in that, The card (12) has a flushing port (15) that communicates with the flushing channel (14).

7. A drainage device for oral and maxillofacial infections in the care of cancer patients according to claim 6, characterized in that, The flushing port (15) is obliquely opened and the spray direction is directed towards the axial direction of the drainage pipe (3).

8. A drainage device for oral and maxillofacial infections in the care of cancer patients according to claim 1, characterized in that, The dressing (2) has a spiral disc structure and the gap between the discs is provided with protrusions (21).

9. A drainage device for oral and maxillofacial infections in the care of cancer patients according to claim 1, characterized in that, The fixing seat (1) is covered with a retractable folding tube (10) to cover the portion of the drainage tube (3) that is pulled out from the fixing seat (1).

10. A drainage device for oral and maxillofacial infections in the care of cancer patients according to claim 1, characterized in that, The drainage tube (3) has a drainage port (31) with an increasing diameter along the drainage direction.

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