An anal fistula postoperative dressing and medicine placing device

Abstract

The present application relates to the field of anorectal surgical nursing, in particular to a postoperative dressing and medicine applying device for anal fistula, which comprises a handle, a medicine applying and pushing module is installed on the handle, the medicine applying and pushing module comprises a pushing inner rod, an outer guide sleeve, a depth adjusting sliding seat and a transmission assembly, the pushing inner rod is slidably arranged in the inner part of the outer guide sleeve, the depth adjusting sliding seat is slidably sleeved on the outer wall of the outer guide sleeve, the outer guide sleeve is provided with a limiting assembly for limiting the medicine applying depth and a deviation preventing assembly, and the transmission assembly is connected with the depth adjusting sliding seat, the limiting assembly and the deviation preventing assembly; when the depth adjusting sliding seat is axially slid along the outer guide sleeve to a preset medicine applying depth, the transmission assembly synchronously drives the limiting assembly to change the limit pushing stroke and drives the deviation preventing assembly to adjust, and the medicine applying depth calibration, the pushing stroke limiting and the pushing rod radial deviation preventing function linkage are synchronously completed. The present application is used for solving the safe and accurate postoperative dressing requirement of complex anal fistula wound adaptation.

Description

Technical Field

[0001] This invention relates to the field of anorectal surgery nursing, specifically to a dressing change and medication application device after anal fistula surgery. Background Technology

[0002] Anal fistula is a common postoperative wound condition in proctology. Postoperative wounds are open, with complex fistula morphology, and are generally characterized by uneven wound depth, tortuous fistula tracts, and lesions located far from the anus. Regular postoperative dressing changes and medication administration are crucial for promoting granulation tissue growth and preventing wound infection and fistula recurrence. Currently, routine postoperative dressing changes for anal fistulas in clinical practice rely on standardized traditional dressing tools. These tools are mainly divided into two categories: First, a sterile dressing kit, containing two sterile forceps and two hemostatic forceps. The forceps are used separately: one to handle wound contaminants, and the other to hold sterile dressings and medications, avoiding cross-contamination. A sterile kidney dish is also provided for the categorized placement of consumables such as sterile cotton balls and medical drainage strips, along with various sizes of sterile gauze for wound cleaning, medication application, and wound bandaging. Second, disposable powder-free sterile medical rubber gloves, which medical staff must wear throughout the dressing change process to prevent direct contact of hand bacteria with the open wound and reduce the risk of exogenous infection. The aforementioned traditional dressing change consumables are inexpensive and widely available, and can meet the basic wound cleaning needs, but they have inherent defects that cannot be avoided in the precise targeted drug delivery process.

[0003] In actual clinical dressing changes, medical staff rely solely on handheld clamping instruments (tweezers, hemostats) to push medication. There is no mechanical structure to constrain the depth of medication application, nor is there any structure to radially guide the pusher. For tortuous, deep, and distal anal fistulas, the pushing distance and angle are entirely controlled by hand. During manual pushing, the hand is prone to slight tremors, and the lack of a guiding or limiting structure on the clamping instruments makes the pushing path easily deviate. This not only easily leads to inaccurate medication application to the fistula wound, resulting in medication deviation and reduced efficacy, but also easily punctures the delicate new granulation tissue around the anus, directly causing severe pain during dressing changes and secondary bleeding. Furthermore, manual control of the medication depth is inconsistent, frequently resulting in insufficient efficacy due to shallow application or damage to deep, normal anal canal tissue due to excessive application. This approach fails to meet the minimally invasive and precise medication needs of complex anal fistula wounds, significantly impacting postoperative wound healing efficiency.

[0004] The limited number of dedicated anal fistula medication delivery devices on the market still fail to solve the fundamental problems of poor stability and uncontrollable delivery depth associated with manual medication administration. In summary, the clinical field currently lacks an integrated medication delivery device that can simultaneously achieve depth control, stroke limitation, and rod deviation prevention in a single operation. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides a dressing change and medication application device for anal fistula surgery. This device solves the technical problems of existing traditional dressing clamping tools and conventional medication administration instruments, which cannot simultaneously control the depth of medication application and the radial posture of the push rod. Manual medication application is prone to deviation, uncontrollable depth, easy to puncture the wound, and has poor medication accuracy, making it difficult to adapt to the minimally invasive and precise dressing change of complex anal fistula wounds.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a dressing change and medication application device after anal fistula surgery, comprising a handle, a medication delivery module installed on the handle, the medication delivery module comprising an inner push rod, an outer guide sleeve, a depth adjustment sliding seat and a transmission assembly, the inner push rod being slidably inserted inside the outer guide sleeve, the depth adjustment sliding seat being slidably sleeved on the outer wall of the outer guide sleeve, the outer guide sleeve being respectively equipped with a limiting component and an anti-deviation component for limiting the medication depth, and the transmission assembly being linked and connected to the depth adjustment sliding seat, the limiting component and the anti-deviation component respectively;

[0007] When the sliding depth adjustment seat is adjusted along the axial direction of the outer guide sleeve to preset the drug delivery depth, the transmission component synchronously drives the limit component to change the limit push stroke and drives the anti-deviation component to adjust, thus synchronously completing the linkage of drug delivery depth calibration, push stroke limit and push rod radial anti-deviation function.

[0008] Furthermore, the transmission assembly includes several sets of traction steel ropes and reversing pulleys. The handle has an installation space inside, and the reversing pulleys are fixedly connected in the installation space. One end of each traction steel rope is fixedly connected to the depth adjustment sliding seat. One set of traction steel ropes is connected to the limiting component after being reversed by the reversing pulley, and the other set of traction steel ropes is connected to the anti-deviation component after being reversed by the reversing pulley. The linear displacement of the depth adjustment sliding seat is synchronously converted into the stroke displacement of the limiting component.

[0009] Furthermore, the limiting component includes a limiting retaining ring slidably sleeved on the tail of the inner push rod and an axial guide groove. The axial guide groove is opened on the inner side of the outer guide sleeve wall. The limiting retaining ring is engaged and assembled inside the axial guide groove and can slide along the axial direction of the outer guide sleeve. When the traction steel rope pulls the limiting retaining ring to move, it simultaneously drives the depth adjustment sliding seat to move. When the wound drug delivery depth is increased, the limiting retaining ring moves forward synchronously to extend the effective pushing stroke of the inner push rod. When the wound drug delivery depth is decreased, the limiting retaining ring moves backward synchronously to shorten the effective pushing stroke.

[0010] Furthermore, a stop protrusion is fixedly connected to one side of the limiting ring, and a stop step matching the stop protrusion is opened on the inner push rod; when the inner push rod pushes the drug forward to the preset maximum drug delivery depth, the stop protrusion and the stop step abut and lock the pushing action.

[0011] Furthermore, the anti-deviation component includes a guide ring, several elastic corrective valves, and a return spring. The elastic corrective valves are evenly arranged circumferentially along the front end of the outer guide sleeve. The return spring corresponds to the elastic corrective valve and is installed on the outside of the elastic corrective valve. The elastic corrective valves enclose to form a central corrective hole through which the inner push rod passes. The guide ring is hinged to the bottom of the elastic corrective valve. The end of the traction steel rope is fixedly connected to the guide ring. When the depth adjustment sliding seat moves forward to increase the drug delivery depth, the tension of the traction steel rope increases synchronously, causing the elastic corrective valves to synchronously retract inward, reducing the diameter of the central corrective hole to hold the inner push rod tightly.

[0012] The two ends of the reset spring abut against the inner wall of the outer guide sleeve and the outer wall of the elastic corrective valve, respectively. When the depth adjustment sliding seat moves backward to reduce the preset drug delivery depth, the tension of the traction steel rope is released, and the elastic spring rebounds to push the elastic corrective valve to open outward, thus expanding the diameter of the central corrective hole.

[0013] Furthermore, the outer wall of the outer guide sleeve is provided with a depth scale along the axial direction, and the side wall of the depth adjustment sliding seat is provided with scale indicator lines. The depth scale is used by the operator to intuitively and quantitatively adjust the drug delivery depth.

[0014] Furthermore, a locking bolt is threaded through the depth adjustment slide seat, and the bottom end of the locking bolt can press tightly against the outer wall of the outer guide sleeve.

[0015] Furthermore, the front end of the external guide sleeve is detachably connected to a flexible drug delivery tip. The flexible drug delivery tip can adapt to the tortuous anal fistula wound by slightly bending and deforming, thus adapting to the drug delivery path of the curved and irregular anal fistula wound. The end face of the flexible drug delivery tip is rounded and blunted, and an annular drug storage groove is opened on the side wall of the flexible drug delivery tip.

[0016] Furthermore, a perianal limiting washer is fixedly connected to one end of the outer guide sleeve near the handle. The end face of the perianal limiting washer is set perpendicular to the axial direction of the outer guide sleeve. The perianal limiting washer is used to fit against the patient's perianal skin to form a physical barrier.

[0017] Furthermore, anti-slip strips are fixedly connected to the handle. The anti-slip strips are arranged in an equidistant array along the length of the handle, and the outer side of the anti-slip strips is provided with continuous arc-shaped anti-slip texture.

[0018] The above approach has the following beneficial effects:

[0019] 1. This solution features a transmission assembly consisting of a single depth adjustment sliding seat, a traction steel rope, and a reversing pulley. This allows for single-slide adjustment, simultaneously completing three functions: drug delivery depth calibration, push stroke limit, and radial anti-deviation of the push rod. Compared to traditional devices where depth adjustment, limit protection, and rod straightening structures are independent and require step-by-step manual adjustment, this simplifies the overall dressing change process, avoids parameter matching errors caused by multi-step adjustments, and achieves automatic parameter matching of each functional component through pure mechanical linkage. The overall operation logic is more in line with the clinical dressing change needs.

[0020] 2. This solution features a dual internal and external limiting protection structure. The internal limiting ring provides rigid stopping of the inner rod's medication delivery stroke, while the perianal limiting washer prevents the outer guide cannula from excessively intruding into the anal canal. Compared to traditional dressing change instruments that lack limiting structures and rely entirely on the medical staff's touch to control the delivery depth, this solution avoids excessive delivery from two dimensions: the inner rod's feeding and the overall insertion of the outer guide cannula. This effectively prevents tearing and friction damage to newly formed granulation tissue, reduces the risk of secondary wound injury and infection, and improves the safety of dressing change procedures.

[0021] 3. This solution combines axial depth scales and scale indicators to achieve visualized and quantitative depth adjustment. It also adds locking bolts to fix the position of the sliding seat after adjustment. Compared to traditional dressing change instruments that rely entirely on the operator's clinical experience to subjectively judge the depth of medication application and are prone to slippage after adjustment, this solution avoids adjustment errors caused by human experience, ensures stable device adjustment parameters throughout the dressing change process, and prevents positional shifts caused by instrument vibration and friction against the anal canal wall during surgery, thus improving the accuracy of medication application positioning.

[0022] 4. This solution features a flexible, self-adaptive drug delivery tip at the front end, and an anti-slip structure added to the handle, working in conjunction with the elastic stabilizing valve at the front end to improve operational stability. Compared with traditional dressing change instruments that are rigid in structure, cannot adapt to tortuous and irregular wounds, and are prone to slipping and shaking during operation, this solution can adapt to various complex anal fistula wounds of varying depths, tortuous paths, and far from the anus. The flexible tip can conform to the drug delivery path of the wound, and at the same time, it reduces instrument shaking from both the gripping end and the pushing end, preventing the wound from being poked during the drug delivery process and reducing the stinging pain of the wound when changing the dressing. Attached Figure Description

[0023] Figure 1 This is an isometric view of an embodiment of the postoperative dressing and medication application device for anal fistula of the present invention;

[0024] Figure 2 This is a front view of an embodiment of the postoperative dressing change and medication application device for anal fistula of the present invention;

[0025] Figure 3 for Figure 2 A cross-sectional view along the AA direction.

[0026] The reference numerals in the accompanying drawings include: 1. Handle; 101. Installation space; 2. Push inner rod; 3. Outer guide sleeve; 4. Depth adjustment sliding seat; 5. Reversing pulley; 6. Traction steel rope; 7. Limiting retaining ring; 701. Axial guide groove; 8. Elastic corrective valve; 801. Guide ring; 9. Flexible drug delivery tip. Detailed Implementation

[0027] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] The following detailed description illustrates the specific implementation method:

[0031] Example 1:

[0032] As attached Figures 1 to 3As shown: A dressing change and medication application device after anal fistula surgery includes a handle 1, on which anti-slip strips are fixedly connected. The anti-slip strips are arranged in an equidistant array along the length of the handle 1, and the outer side of the anti-slip strips is provided with continuous arc-shaped anti-slip texture. The handle 1 is equipped with a drug delivery module, which includes an inner push rod 2, an outer guide sleeve 3, a depth adjustment sliding seat 4, and a transmission component. The inner push rod 2 slides through the inside of the outer guide sleeve 3, and the depth adjustment sliding seat 4 slides on the outer wall of the outer guide sleeve 3. The outer guide sleeve 3 is equipped with a limiting component and an anti-deviation component for limiting the drug delivery depth. The transmission component is linked to the depth adjustment sliding seat 4, the limiting component, and the anti-deviation component. When the depth adjustment sliding seat 4 slides along the axial direction of the outer guide sleeve 3 to a preset drug delivery depth, the transmission component simultaneously drives the limiting component to change the limit push stroke and drives the anti-deviation component to adjust, thus simultaneously completing the linkage of drug delivery depth calibration, push stroke limitation, and radial anti-deviation function of the push rod, thereby adapting to drug delivery operations for anal fistula wounds of varying depths, tortuous paths, and far from the anus.

[0033] The transmission assembly includes several sets of traction steel ropes 6 and reversing pulleys 5. The handle 1 has an installation space 101 inside. The reversing pulleys 5 are fixedly connected in the installation space 101. One end of each traction steel rope 6 is fixedly connected to the depth adjustment sliding seat 4. One set of traction steel ropes 6 is connected to the limiting component after being reversed by the reversing pulleys 5. The other set of traction steel ropes 6 is connected to the anti-deviation component after being reversed by the reversing pulleys 5. The linear displacement of the depth adjustment sliding seat 4 is synchronously converted into the stroke displacement of the limiting component.

[0034] The limiting component includes a limiting retaining ring 7 slidably sleeved at the tail of the inner push rod 2 and an axial guide groove 701. The axial guide groove 701 is opened on the inner side of the outer guide sleeve 3. The limiting retaining ring 7 is engaged inside the axial guide groove 701 and can slide axially along the outer guide sleeve 3. When the traction steel rope 6 pulls the limiting retaining ring 7 to move, it simultaneously drives the depth adjustment sliding seat 4 to move. When the wound drug delivery depth is increased, the limiting retaining ring 7 moves forward synchronously to extend the effective pushing stroke of the inner push rod 2. When the wound drug delivery depth is decreased, the limiting retaining ring 7 moves backward synchronously to shorten the effective pushing stroke. A stop boss is fixedly connected to one side of the limiting retaining ring 7, and a stop step matching the stop boss is opened on the inner push rod 2. When the inner push rod 2 pushes the drug forward to the preset maximum drug delivery depth, the stop boss and the stop step abut and lock the pushing action.

[0035] The anti-deviation component guide ring 801 includes several elastic corrective flaps 8 and a return spring. The elastic corrective flaps 8 are evenly arranged circumferentially along the front end of the outer guide sleeve 3. The return spring corresponds to the elastic corrective flaps 8 and is installed on the outside of the elastic corrective flaps 8. The elastic corrective flaps 8 together form a central corrective hole through which the inner push rod 2 passes. The guide ring 801 is hinged to the bottom of the elastic corrective flaps 8. The end of the traction steel rope 6 is fixedly connected to the guide ring 801. When the depth adjustment sliding seat 4 moves forward to increase the drug administration depth, the tension of the traction steel rope 6 is simultaneously increased, causing the elastic corrective flaps 8 to simultaneously retract inward, reducing the diameter of the central corrective hole to hold the inner push rod 2 tightly. The two ends of the return spring abut against the inner wall of the outer guide sleeve 3 and the outer wall of the elastic corrective flap 8, respectively. When the depth adjustment sliding seat 4 moves backward to reduce the preset drug administration depth, the tension of the traction steel rope 6 is released, and the return spring elastically rebounds to push the elastic corrective flaps 8 outward, expanding the diameter of the central corrective hole.

[0036] The front end of the outer guide sleeve 3 is detachably connected to a flexible drug delivery end 9. The flexible drug delivery end 9 can adapt to the tortuous anal fistula wound by slightly bending and deforming, and adapt to the drug delivery path of the curved and irregular anal fistula wound. The end face of the flexible drug delivery end 9 is rounded and blunted, and an annular drug storage groove is opened on the side wall of the flexible drug delivery end 9.

[0037] The specific implementation process is as follows: After completing the overall disinfection process, the operator evenly fills the annular drug storage groove on the side wall of the flexible drug delivery tip 9 with the postoperative special dressing ointment. The rounded and blunt end face of the tip has no sharp edges, which can avoid scratching the delicate mucosa of the perianal area and anal canal wall during the initial insertion of the anal canal. The operator holds the device handle 1. The anti-slip strips distributed in an array on the outer side of the handle 1, combined with the arc-shaped anti-slip texture on the surface, can greatly increase the friction between the hand and the handle 1, avoiding slippage and unstable grip caused by sweaty hands during the drug delivery process. This reduces the problem of pushing and shaking from the source of operation, ensuring that the drug delivery operation is stable and controllable throughout.

[0038] Based on the actual condition of the patient's anal fistula wound, the medication parameters are preset: For complex anal fistula wounds that are deep, tortuous, and far from the anus, the operator slides the depth adjustment slide seat 4 forward along the outer guide sleeve 3 to increase the preset medication depth. Under the single forward movement of the depth adjustment slide seat 4, the transmission components start the linkage work simultaneously: the first group of traction steel ropes 6 completes the force conversion with the help of the reversing pulley 5 fixed inside the handle 1, directly pulling the limit stop ring 7 to slide backward along the axial guide groove 701, actively increasing the effective pushing stroke of the inner push rod 2; the second group of traction steel ropes 6 are simultaneously pulled by the force to pull each group of elastic corrective valves 8, overcoming the elasticity of the reset spring and driving multiple elastic corrective valves 8 to simultaneously retract inward, reducing the diameter of the central corrective hole, and clamping the inner push rod 2 from all directions.

[0039] After the preset procedure is completed, the operator slowly inserts the front end of the outer guide sleeve 3 into the patient's anal canal. Once the flexible drug delivery tip 9 contacts the wound, the operator slowly pushes the inner push rod 2 forward to complete the drug delivery. When the inner push rod 2 reaches the preset maximum safe drug delivery depth, the stop protrusion on the side of the limiting ring 7 directly and rigidly abuts against the stop step on the inner push rod 2, mechanically locking the forward movement of the inner push rod 2. This prevents the instrument from being inserted too deeply due to improper manual pushing force control, thus preventing secondary damage to the wound from a mechanical structural perspective. Simultaneously, the elastic stabilizing valve 8, which remains taut throughout the procedure, restrains the radial displacement of the inner push rod 2, preventing lateral deviation and ensuring accurate drug delivery to the fistula wound.

[0040] For superficial, conventional anal fistula wounds, the operator directly slides the depth adjustment slide seat 4 backward to reduce the preset drug delivery depth. At this time, the tension of the traction steel rope 6 is released simultaneously, and the elastic return spring pushes the elastic stabilizing valve 8 outward to expand the diameter of the central stabilizing hole, reducing the clamping force on the inner push rod 2 and adapting to the spacious pushing space of the superficial wound. Simultaneously, the limiting stop ring 7 moves backward, extending the effective feeding stroke of the inner push rod 2 to match the drug delivery distance requirements of the superficial wound. After drug delivery is completed, the inner push rod 2 and the device of this invention can be directly pulled back to complete a single dressing change process.

[0041] Example 2:

[0042] The difference from Example 1 is that the outer wall of the outer guide sleeve 3 is provided with a depth scale along the axial direction, and the side wall of the depth adjustment sliding seat 4 is provided with a scale indicator line. The depth scale is used by the operator to intuitively and quantitatively adjust the drug delivery depth.

[0043] The specific implementation process is as follows: The operator fills the dressing ointment into the annular storage tank of the flexible drug delivery end 9, and holds the handle 1 with anti-slip strips to maintain a stable grip on the instrument. Before changing the dressing, based on the patient's preoperative imaging results, the precise drug delivery depth value of the anal fistula wound is determined. The operator directly observes the depth scale on the outside of the outer guide sleeve 3, and, in conjunction with the scale indicator line on the side wall of the depth adjustment slide seat 4, precisely slides and adjusts the depth adjustment slide seat 4, aligning the indicator line with the corresponding depth scale, and quickly completes the quantitative preset of the drug delivery depth.

[0044] After the sliding seat completes its positioning, the single sliding motion synchronously links the limit component to adjust the pushing limit stroke and the linkage anti-deviation component to adjust the clamping force of the elastic corrective valve 8. The subsequent operation procedures for inserting the anal tube, pushing the drug delivery, and mechanical locking are consistent with those in Example 1.

[0045] Example 3:

[0046] The difference from Embodiment 2 is that a locking bolt is threaded through the depth adjustment sliding seat 4, and the bottom end of the locking bolt can press against the outer wall of the outer guide sleeve 3.

[0047] The specific implementation process is as follows: After completing sterilization and drug loading, the operator adjusts the sliding seat 4 according to the depth and tortuosity of the patient's anal fistula wound. Relying on the transmission cooperation between the internal traction steel rope 6 and the reversing pulley 5, the operator simultaneously adjusts the pushing stroke of the limiting component and the adaptive clamping force of the anti-deviation component elastic stabilizing valve 8 to match the current wound's drug administration and protection requirements. After the sliding seat is adjusted to the appropriate position, the operator rotates the locking bolt, using the threaded feed action to tightly press the bottom of the locking bolt against the outer wall of the outer guide sleeve 3. Friction is used to lock the axial position of the depth-adjusted sliding seat 4, preventing spontaneous axial movement of the sliding seat during subsequent instrument insertion and drug delivery.

[0048] Example 4:

[0049] The difference from Embodiment 3 is that an anal limiting washer is fixedly connected to one end of the outer guide sleeve 3 near the handle 1. The end face of the anal limiting washer is set perpendicular to the axial direction of the outer guide sleeve 3. The anal limiting washer is used to fit against the patient's anal skin to form a physical barrier.

[0050] The specific implementation process is as follows: The operator completes sterilization and medication loading. Based on the actual condition of the patient's anal fistula wound, the sliding depth of the sliding seat 4 is adjusted. Relying on the linkage transmission of the internal traction steel rope 6 and the reversing pulley 5, the limit stroke adjustment of the inner rod 2 and the adaptive adjustment of the clamping force of the elastic corrective valve 8 are simultaneously completed to match the dressing change requirements of the corresponding wound. After parameter adjustment, the front end of the outer guide sleeve 3 is slowly inserted into the patient's anal canal. When the sleeve is inserted to the appropriate position, the perianal limiting washer fixed at the base of the outer guide sleeve 3 directly adheres to and presses against the patient's perianal lateral skin, forming a rigid physical barrier to restrict the outer guide sleeve 3 from further invading deeper into the anal canal.

[0051] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A dressing change and medication application device after anal fistula surgery, comprising a handle (1), wherein a medication delivery module is installed on the handle (1), characterized in that, The drug delivery module includes an inner push rod (2), an outer guide sleeve (3), a depth adjustment sliding seat (4), and a transmission assembly. The inner push rod (2) slides through the inside of the outer guide sleeve (3), and the depth adjustment sliding seat (4) slides on the outer wall of the outer guide sleeve (3). The outer guide sleeve (3) is equipped with a limiting assembly and an anti-deviation assembly for limiting the drug delivery depth. The transmission assembly is linked to the depth adjustment sliding seat (4), the limiting assembly, and the anti-deviation assembly. When the sliding depth adjustment slide seat (4) along the outer guide sleeve (3) is adjusted to the preset drug delivery depth, the transmission component synchronously drives the limit component to change the limit push stroke and drives the anti-deviation component to adjust, and synchronously completes the drug delivery depth calibration, push stroke limit and push rod radial anti-deviation function linkage.

2. The postoperative dressing and medication placement device for anal fistula as described in claim 1, characterized in that, The transmission assembly includes several sets of traction steel ropes (6) and reversing pulleys (5). The handle (1) has an installation space (101) inside. The reversing pulleys (5) are fixedly connected in the installation space (101). One end of each traction steel rope (6) is fixedly connected to the depth adjustment sliding seat (4). One set of traction steel ropes (6) is connected to the limiting assembly after being reversed by the reversing pulleys (5). The other set of traction steel ropes (6) is connected to the anti-deviation assembly after being reversed by the reversing pulleys (5). The linear displacement of the depth adjustment sliding seat (4) is synchronously converted into the stroke displacement of the limiting assembly.

3. The postoperative dressing and medication placement device for anal fistula as described in claim 2, characterized in that, The limiting component includes a limiting retaining ring (7) that is slidably sleeved at the tail of the inner push rod (2) and an axial guide groove (701). The axial guide groove (701) is opened on the inner side of the tube wall of the outer guide sleeve (3). The limiting retaining ring (7) is engaged and assembled inside the axial guide groove (701) and can slide along the axial direction of the outer guide sleeve (3). When the traction steel rope (6) pulls the limiting retaining ring (7) to move, it simultaneously drives the depth adjustment sliding seat (4) to move. When the wound administration depth is increased, the limiting retaining ring (7) moves forward simultaneously to extend the effective pushing stroke of the inner push rod (2). When the wound administration depth is decreased, the limiting retaining ring (7) moves backward simultaneously to shorten the effective pushing stroke.

4. The postoperative dressing and medication placement device for anal fistula as described in claim 3, characterized in that, A stop protrusion is fixedly connected to one side of the limiting ring (7), and a stop step matching the stop protrusion is opened on the inner push rod (2); when the inner push rod (2) pushes the drug forward to the preset maximum drug delivery depth, the stop protrusion and the stop step abut against each other to lock the pushing action.

5. The postoperative dressing and medication placement device for anal fistula as described in claim 4, characterized in that, The anti-deviation component includes a guide ring (801), several elastic corrective valves (8), and a return spring. The elastic corrective valves (8) are evenly arranged around the front end of the outer guide sleeve (3). The return spring corresponds to the elastic corrective valves (8) and is installed on the outside of the elastic corrective valves (8). The elastic corrective valves (8) together form a central corrective hole through which the inner push rod (2) passes. The guide ring (801) is hinged to the bottom of the elastic corrective valves (8). The end of the traction steel rope (6) is fixedly connected to the guide ring (801). When the depth adjustment sliding seat (4) moves forward to increase the drug delivery depth, the tension of the traction steel rope (6) is simultaneously increased, causing the elastic corrective valves (8) to simultaneously retract inward, reducing the diameter of the central corrective hole to hold the inner push rod (2). The two ends of the reset spring abut against the inner wall of the outer guide sleeve (3) and the outer wall of the elastic corrective valve (8) respectively. When the depth adjustment sliding seat (4) moves backward to reduce the preset drug administration depth, the tension of the traction steel rope (6) is released, and the elastic spring rebounds to push the elastic corrective valve (8) to open outward, thus expanding the diameter of the central corrective hole.

6. The postoperative dressing and medication placement device for anal fistula as described in claim 5, characterized in that, The outer guide sleeve (3) has a depth scale along the axial direction on its outer wall, and the depth adjustment sliding seat (4) has a scale indicator line on its side wall. The depth scale is used by the operator to intuitively and quantitatively adjust the drug delivery depth.

7. The postoperative dressing and medication placement device for anal fistula according to claim 6, characterized in that, The depth adjustment sliding seat (4) is threaded through and fitted with a locking bolt. The bottom end of the locking bolt can press against the outer wall of the outer guide sleeve (3).

8. The postoperative dressing and medication placement device for anal fistula according to claim 7, characterized in that, The front end of the external guide sleeve (3) is detachably connected to a flexible drug delivery end (9). The flexible drug delivery end (9) can adapt to the tortuous anal fistula wound by slightly bending and deforming, and adapt to the drug delivery path of the curved and irregular anal fistula wound. The end face of the flexible drug delivery end (9) is rounded and blunted, and an annular drug storage groove is opened on the side wall of the flexible drug delivery end (9).

9. The postoperative dressing and medication placement device for anal fistula according to claim 8, characterized in that, An anal limiting washer is fixedly connected to one end of the outer guide sleeve (3) near the handle (1). The end face of the anal limiting washer is set perpendicular to the axial direction of the outer guide sleeve (3). The anal limiting washer is used to fit the skin on the outside of the patient's anus to form a physical barrier.

10. The postoperative dressing and medication application device for anal fistula according to claim 9, characterized in that, Anti-slip strips are fixedly connected to the handle (1). The anti-slip strips are arranged in an equidistant array along the length of the handle (1), and the outer side of the anti-slip strips is provided with continuous arc-shaped anti-slip texture.

Images