A retractable protective sleeve for use under an endoscope

Abstract

The utility model relates to medical instrument technical field, concretely is a telescopic protective sleeve for use under endoscope, telescopic protective sleeve includes: protective sleeve main part and adjusting portion, protective sleeve main part one end sets up duck's tongue, and the other end is connected adjusting portion, under the control of adjusting portion, protective sleeve main part can be relative endoscope axial movement, with adjusting duck's tongue and endoscope front end's relative overhanging amount, the utility model discloses through screw pair etc. Structure realizes protective sleeve main part axial slip to change duck's tongue relative overhanging amount, need not to replace sleeve to be suitable for different anatomical position, reduce the number of times of instrument replacement in operation, shorten operation time, and sealed structure can stabilize mirror in perfusion pressure, avoid liquid reflux and pollution risk.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically a retractable protective sleeve used under endoscopy. Background Technology

[0002] In the field of endoscopic minimally invasive surgery, with the continuous development of technology and the increasingly wide range of applications, surgical procedures place higher demands on the adaptability and functionality of related instruments. Among them, the endoscopic protective cannula, as a key auxiliary instrument in the surgical process, directly affects the accuracy, safety, and efficiency of the surgery due to its rational design.

[0003] Currently, in most minimally invasive surgeries requiring endoscopy, the endoscopic protective cannula uses a fixed duckbill length design. The core feature of this design is that the relative distance between the front of the duckbill and the anterior wheel of the endoscope remains constant. However, human anatomy varies from person to person, and the location of bones or tissues differs significantly among different populations. A fixed duckbill length design cannot effectively accommodate these differences, causing numerous inconveniences during surgery. In actual surgical procedures, when encountering superficial or deep bones or tissues, the inability to adjust the duckbill length prevents it from providing adequate support. This not only affects the clarity of the surgical field and the stability of the procedure but may also restrict the manipulation of surgical instruments due to insufficient support, thereby increasing the risks faced by the patient during surgery, such as the increased likelihood of complications like tissue damage and bleeding.

[0004] To address the operational challenges posed by different bone or tissue locations, some surgical teams opt to frequently change endoscopic protective cannulas of varying lengths during surgery. However, this practice introduces a series of new problems. First, frequent cannula changes complicate the surgical procedure, requiring medical staff to spend extra time and effort on instrument changes during critical stages, which is extremely inconvenient, easily distracting, and affects the continuity and precision of the surgery. Second, frequent instrument changes may pose unknown risks to patients, such as increased infection rates and damage to surrounding tissues due to repeated manipulation. More seriously, frequent cannula changes inevitably prolong surgical time. Extended surgical time means patients need to endure longer periods of anesthesia, significantly increasing anesthetic risks such as respiratory depression and circulatory fluctuations. Postoperative recovery also becomes more difficult, potentially requiring longer hospital stays and recovery periods, placing a double burden on patients both physically and financially. Furthermore, the management and storage of protective cannulas of different lengths present challenges. Hospitals need more storage space and specialized classification management systems to ensure the accurate storage and timely retrieval of protective cannulas of various lengths. This not only increases the operating costs of medical institutions, but also wastes resources, which is inconsistent with the development trend of efficient use of modern medical resources.

[0005] Given the numerous drawbacks of the fixed-length endoscopic protective sheath, developing an adjustable-length endoscopic protective sheath is particularly urgent and important. Promoting innovation in protective sheath technology during endoscopic minimally invasive surgery is a key link in achieving precision, efficiency, and safety in surgery, and is of vital importance for improving the level of medical services and enhancing the patient's medical experience. Utility Model Content

[0006] The purpose of this invention is to provide a retractable protective sleeve for use under an endoscope in order to solve at least one of the above-mentioned technical problems.

[0007] This utility model achieves the above objectives through the following technical solutions: A retractable protective sleeve for use under endoscopy includes: a protective sleeve body and an adjustment part; The protective sleeve body is provided with a duckbill at one end and connected to the adjustment part at the other end; Under the control of the adjustment unit, the protective sleeve body can move axially relative to the endoscope to adjust the relative extension of the duckbill and the tip of the endoscope.

[0008] Furthermore, the adjustment part includes: a head fixing ring, an adjustment knob, and a limiting flange; The protective sleeve body is connected to the limiting flange at one end opposite to the duckbill; the protective sleeve body can slide axially relative to the limiting flange. The head retaining ring restricts the relative position of the limiting flange and the adjusting knob; The adjustment knob is rotatably connected to the protective sleeve body, and the relative position of the protective sleeve body and the limiting flange can be controlled by rotating the adjustment knob.

[0009] Furthermore, the adjusting part also includes: a pin; The protective sleeve body is provided with a limiting groove along the axial direction at the end opposite to the duckbill; The limiting flange is provided with pin holes that match the position and number of the limiting grooves. One end of the pin passes through the limiting groove and the pin hole, thereby limiting and connecting the limiting flange to the protective sleeve body.

[0010] Furthermore, the groove width of the limiting groove, the inner diameter of the pin hole, and the nominal diameter of the pin are matched and a clearance fit is adopted.

[0011] Furthermore, multiple limiting grooves may be provided circumferentially along the main body of the protective sleeve; The number of pin holes and the number of pins match the number of limiting grooves.

[0012] Furthermore, the front end of the limiting flange is provided with a flange; the flange is axially clamped between the head fixing ring and the adjusting knob, so that the limiting flange is axially fixed relative to the head fixing ring.

[0013] Furthermore, the adjustment part also includes: an adjustment block in a ring shape and a pin; The inner side of the adjusting block is fixedly connected to the outer side of the protective sleeve body, and the outer side is provided with external threads; The adjustment knob is hollow inside and its inner wall is provided with an internal thread that matches the external thread of the adjustment block; The adjustment knob is provided with a limiting groove on the inner circumferential side of its rear end. The front end of the head fixing ring is inserted into the limiting groove, and the limiting groove is rotatably connected to the head fixing ring. The adjusting knob has a positioning hole on its outer wall, and the head fixing ring has an annular positioning groove on its outer wall that matches the positioning hole. One end of the pin passes through the positioning hole and connects to the positioning groove inside the limiting groove, so that the adjusting knob and the head fixing ring can only rotate axially.

[0014] Furthermore, the outer wall of the adjustment knob is provided with a plurality of positioning holes at equal intervals in a circumferential direction, and the number of the pins is the same as the number of the positioning holes.

[0015] Furthermore, a circumferential front sealing groove and a rear sealing groove are provided along the inner side of the head fixing ring; A front sealing ring is provided in the front sealing groove, and a rear sealing ring is provided in the rear sealing groove. The inner side of the front sealing ring elastically abuts against the adjustment knob, and the inner side of the rear sealing ring elastically abuts against the main body of the protective sleeve.

[0016] Furthermore, when the retractable protective sleeve is connected to the endoscope, the rear sealing ring further elastically abuts against the outer wall of the insertion part of the endoscope to achieve airtight isolation between the endoscope and the protective sleeve.

[0017] A method for installing a retractable protective sleeve, used to assemble a retractable protective sleeve for use under an endoscope as described above, the installation method comprising: Insert the protective sleeve body into the limiting flange, and align the limiting groove on the protective sleeve body with the pin hole on the limiting flange, and insert the pin. The adjusting block is fixed to the end of the protective sleeve body away from the duckbill; The head fixing ring is coaxially connected to the limiting flange, and the front sealing ring and the rear sealing ring are respectively installed in the front sealing groove and the rear sealing groove of the limiting flange. Align the limiting groove of the adjusting knob with the front end of the head fixing ring and screw it in so that the internal thread of the adjusting knob engages with the external thread of the adjusting block; Press the pin into the positioning hole of the adjustment knob and engage it in the annular positioning groove provided on the outer wall of the head fixing ring; Insert the assembled retractable protective sleeve into the end of the endoscope, and turn the adjustment knob to extend or retract the duckbill axially.

[0018] The beneficial effects of this utility model are as follows: This invention presents a retractable protective sheath for use under endoscopy, greatly simplifying surgical procedures. During surgery, medical staff can quickly and precisely control the extension length of the protective sheath's tongue by rotating an adjustment knob, perfectly adapting it to different surgical scenarios and tissue locations. This flexible adjustment method avoids tedious adjustments due to unsuitable sheath length, significantly reducing surgical time, improving surgical efficiency, and saving valuable treatment time for patients.

[0019] The retractable protective sleeve introduced in this invention effectively solves the problem of previously needing to purchase multiple protective sleeves of different lengths for duckbill endoscopes. A single adjustable protective sleeve can meet various surgical needs, significantly reducing the types and quantities of medical devices required, thereby lowering medical costs. At the same time, medical staff no longer need to frequently change protective sleeves of different specifications during surgery, further improving ease of use and making the surgical procedure smoother and more efficient. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a retractable protective sleeve used under an endoscope according to one embodiment of the present invention. Figure 2 for Figure 1 Enlarged sectional view of point A in the diagram; Figure 3 This is a schematic diagram illustrating the application of a retractable protective sleeve used under an endoscope according to one embodiment of the present invention.

[0021] Among them, 1. Endoscope; 2. Telescopic protective sleeve; 21. Duckbill; 22. Head fixing ring; 23. Adjustment knob; 24. Limiting flange; 25. Pin; 26. Front sealing ring; 27. Rear sealing ring; 28. Adjusting block; 29. ​​Limiting groove; 30. Pin; 31. Limiting groove; 32. Positioning groove. Detailed Implementation

[0022] The present invention will now be discussed with reference to exemplary embodiments. It should be understood that the described embodiments are merely intended to enable those skilled in the art to better understand and thus implement the present invention, and are not intended to imply any limitation on the scope of the present invention.

[0023] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment".

[0024] Example 1 Figure 1 This is a schematic diagram of the overall structure of a retractable protective sleeve used under an endoscope according to one embodiment of the present invention. Figure 2 for Figure 1 Enlarged sectional view of point A in the diagram; Figure 3 This is a schematic diagram illustrating the application of a retractable protective sleeve used under an endoscope according to one embodiment of this utility model. Figure 1-3 As shown, according to one embodiment of the present invention, a retractable protective sleeve for use under an endoscope includes: a protective sleeve body and an adjustment part; The protective sleeve body has a duckbill 21 at one end and an adjustment part at the other end; Under the control of the adjustment unit, the protective sleeve body can move axially relative to the endoscope 1 to adjust the relative extension of the duck tongue 21 and the tip of the endoscope 1.

[0025] In this embodiment, a retractable protective sleeve for use under endoscopy is provided, which consists of a protective sleeve body and an adjustment part: the front end of the protective sleeve body is a duckbill 21, and the rear end is connected to the adjustment part; the adjustment part includes a limiting flange 24, a head fixing ring 22, an adjustment knob 23, an adjustment block 28 with external threads, a pin 25, a front sealing ring 26 and a rear sealing ring 27. During assembly, the adjusting block 28 is fixed to the outer wall of the tail end of the protective sleeve body. The external thread of the adjusting block 28 and the internal thread of the adjusting knob 23 form a lead screw pair. The limiting flange 24 is axially clamped between the head fixing ring 22 and the adjusting knob 23 via the flange. The pin 25 passes through the flange pin hole and extends into the axial limiting groove 29 of the protective sleeve body, so that the protective sleeve body can only slide axially and cannot rotate. The rear sealing ring 27 in the head fixing ring 22 elastically abuts against the outer wall of the endoscope after the sleeve is inserted into the endoscope 1, forming an airtight isolation. The front sealing ring 26 elastically abuts against the inner peripheral wall of the adjusting knob 23, ensuring rotational sealing and providing a damping feel. In use, rotating the adjustment knob 23 exposed at the end of the endoscope converts the rotational motion into linear displacement of the adjustment block 28 via the lead screw pair. This causes the protective sheath to slide axially within the endoscope channel, changing the relative extension of the duck tongue 21 and the endoscope tip in real time. This stroke is determined by the length of the limiting groove 29, allowing it to adapt to different anatomical positions without replacing the entire sheath, reducing the number of instrument changes during surgery, shortening the operation time, and ensuring stable intra-endoscopic irrigation pressure while avoiding the risk of fluid backflow and contamination.

[0026] This invention uses a screw pair and other structures to achieve axial sliding of the protective sleeve body to change the relative protrusion of the duck tongue. It can adapt to different anatomical positions without replacing the sleeve, reducing the number of instrument changes during surgery, shortening the operation time, and the sealing structure can stabilize the intra-scope irrigation pressure and avoid the risk of liquid backflow and contamination.

[0027] According to one embodiment of the present invention, the adjustment part includes: a head fixing ring 22, an adjustment knob 23, and a limiting flange 24; The end of the protective sleeve body that is opposite to the duck tongue 21 is connected to the limiting flange 24; the protective sleeve body body can slide axially relative to the limiting flange 24. The head fixing ring 22 restricts the relative position of the limiting flange 24 and the adjusting knob 23; The adjusting knob 23 is rotatably connected to the protective sleeve body, and the relative position of the protective sleeve body and the limiting flange 24 can be controlled by rotating the adjusting knob 23.

[0028] In this embodiment, the adjustment unit includes a head fixing ring 22, an adjustment knob 23, and a limiting flange 24. The limiting flange 24 is slidably engaged with the axial limiting groove 29 at the tail end of the protective sleeve body via a pin 25, allowing the protective sleeve body to slide axially relative to the limiting flange 24 and preventing rotation. The flange at the front end of the limiting flange 24 is axially clamped between the head fixing ring 22 and the adjustment knob 23, thereby limiting the relative axial position of the limiting flange 24 and the adjustment knob 23 by the head fixing ring 22. The adjustment knob 23 is threadedly connected to the adjustment block 28 fixed to the tail end of the protective sleeve body, forming a lead screw pair. When the adjustment knob 23 exposed at the tail end of the endoscope is rotated, the lead screw pair converts the rotational motion into linear displacement of the protective sleeve body, thereby precisely changing the extension amount of the duck tongue 21 and the end of the endoscope 1.

[0029] The adjustment part of this utility model forms a lead screw pair through the cooperation of various components, which converts the rotational movement of the adjustment knob into the linear displacement of the protective sleeve body, and can accurately change the extension amount of the duckbill and the endoscope lens.

[0030] According to one embodiment of the present invention, the adjusting part further includes: a pin 25; A limiting groove 29 is provided axially at the end of the protective sleeve body that is opposite to the duck tongue 21; The limiting flange 24 is provided with pin holes that match the position and number of the limiting groove 29. One end of the pin 25 passes through the limiting groove 29 and the pin hole, thus limiting and connecting the limiting flange 24 to the protective sleeve body.

[0031] Preferably, the groove width of the limiting groove 29, the inner diameter of the pin hole, and the nominal diameter of the pin 25 are matched and a clearance fit is adopted.

[0032] Preferably, multiple limiting grooves 29 may be provided circumferentially along the main body of the protective sleeve; The number of pin holes and pins 25 matches the number of limiting grooves 29.

[0033] In this embodiment, a pin 25 is added to the adjustment section; one or more axially extending limiting grooves 29 are opened on the outer wall of the tail section of the protective sleeve body, and the limiting flange 24 is opened with the same number of pin holes in the same circumferential position; the pin 25 passes through the pin hole and extends into the limiting groove 29 with clearance fit, so that the limiting flange 24 and the protective sleeve body form a sliding-limiting connection. This clearance fit (the groove width, hole diameter and the nominal diameter of the pin are matched) ensures that the sleeve body can slide with low resistance along the axial direction, and prevents the protective sleeve body from rotating around the axis by contacting the side wall of the pin 25 with the groove wall, thereby reliably converting the rotational movement of the adjustment knob 23 into the linear extension and retraction of the duckbill 21; when two or more sets of pin-limiting grooves are arranged in the circumferential direction, the load is evenly distributed, further reducing the risk of unilateral wear, and ensuring that the extension and retraction movement is smooth and without jamming throughout the entire operation.

[0034] This utility model achieves low-resistance axial sliding and anti-rotation of the protective sleeve body through the clearance fit between the pin shaft and the limiting groove and pin shaft hole, reliably converting rotational motion into linear extension and contraction. The circumferential arrangement of multiple sets can reduce the risk of wear and ensure smooth extension and contraction without jamming.

[0035] According to one embodiment of the present invention, the front end of the limiting flange 24 is provided with a flange; the flange is axially clamped between the head fixing ring 22 and the adjusting knob 23, so that the limiting flange 24 is axially fixed relative to the head fixing ring 22.

[0036] In this embodiment, the front end of the limiting flange 24 is integrally formed with a radial flange, which is axially clamped between the end face of the head fixing ring 22 and the rear end face of the adjusting knob 23 to form a rigid positioning. The two sides of the flange are constrained by the support surface of the head fixing ring 22 and the inner step surface of the adjusting knob 23, respectively, which not only prevents the limiting flange 24 from sliding forward, but also restricts its rearward displacement through the reverse end face of the head fixing ring 22, thereby realizing the axial fixation of the limiting flange 24 relative to the head fixing ring 22. At the same time, the end face-to-end face contact method of the flange can uniformly transmit the axial reaction force generated by the screw pair, avoid the pin 25 bearing additional bending moment, ensure that the limiting reference of the protective sleeve body is always stable during the extension and retraction process, and improve the adjustment accuracy and component life.

[0037] This invention achieves axial fixation of the limiting flange flange relative to the head fixing ring by axial clamping, which can uniformly transmit axial reaction force, avoid additional bending moment on the pin bearing, stabilize the limiting reference, and improve adjustment accuracy and component life.

[0038] According to one embodiment of the present invention, the adjusting part further includes: an adjusting block 28 in a ring shape and a pin 30; The inner side of the adjusting block 28 is fixedly connected to the outer side of the protective sleeve body, and the outer side is provided with external threads; The adjustment knob 23 is hollow inside and its inner wall is provided with an internal thread that matches the external thread of the adjustment block 28; A limiting groove 31 is provided on the inner circumferential side of the rear end of the adjusting knob 23. The front end of the head fixing ring 22 is inserted into the limiting groove 31, and the limiting groove 31 is rotatably connected to the head fixing ring 22. The adjustment knob 23 has a positioning hole on its outer wall, and the head fixing ring 22 has an annular positioning groove 32 that matches the positioning hole on its outer wall. One end of the pin 30 passes through the positioning hole and connects with the positioning groove 32 inside the limiting groove 31, so that the adjustment knob 23 and the head fixing ring 22 can only rotate axially.

[0039] Preferably, the outer wall of the adjusting knob 23 is provided with multiple positioning holes at equal intervals in a circumferential direction, and the number of pins 30 is the same as the number of positioning holes.

[0040] In this embodiment, an annular adjusting block 28 and a pin 30 are added to the adjusting part: the inner circumference of the adjusting block 28 is fixed to the tail end of the protective sleeve body, and the outer circumference is provided with external threads, which mesh with the internal threads of the adjusting knob 23 to form a lead screw pair; a limiting groove 31 is opened on the inner circumferential side of the rear end of the adjusting knob 23, and the front end of the head fixing ring 22 is inserted into the groove to form a sliding bearing type rotating connection. The two are axially limited by the flange and cannot be separated; several positioning holes are evenly distributed around the knob, and the pin 30 passes through the positioning holes and falls into the annular positioning groove 32 of the head fixing ring 22, locking the knob circumferentially in the annular groove, so that it can only rotate around the axis and cannot move axially. When the adjusting knob 23 is rotated, the lead screw pair converts the rotational motion into linear displacement of the adjusting block 28 and the protective sleeve body, realizing the stepless extension and retraction of the duckbill 21; the multi-point pin load distribution can reduce unilateral wear, ensure smooth rotation and accurate extension and retraction, and at the same time retain the ability to quickly disassemble and maintain.

[0041] This invention uses a lead screw pair to convert the rotational motion of the adjustment knob into the linear displacement of the protective sleeve body, thereby achieving stepless extension and retraction of the duckbill. The multi-point pin load distribution reduces wear, ensures smooth and precise rotation, and retains the ability to quickly disassemble and maintain the device.

[0042] According to one embodiment of the present invention, a circumferential front sealing groove and a rear sealing groove are provided along the inner side of the head fixing ring 22. A front sealing ring 26 is provided in the front sealing groove, and a rear sealing ring 27 is provided in the rear sealing groove; The inner side of the front sealing ring 26 elastically abuts against the adjusting knob 23, and the inner side of the rear sealing ring 27 elastically abuts against the main body of the protective sleeve.

[0043] Preferably, when the retractable protective sleeve 2 is connected to the endoscope 1, the rear sealing ring 27 further elastically abuts against the outer wall of the insertion part of the endoscope 1 to achieve airtight isolation between the endoscope 1 and the protective sleeve.

[0044] In this embodiment, two circumferential sealing grooves are coaxially formed on the inner side of the head fixing ring 22: a front sealing ring 26 is embedded in the front sealing groove, and its inner circumference elastically abuts against the outer cylindrical surface of the adjusting knob 23; a rear sealing ring 27 is embedded in the rear sealing groove, and its inner circumference elastically abuts against the outer wall of the protective sleeve body, forming two-stage independent seals. When the protective sleeve is inserted into the endoscope 1, the rear sealing ring 27 simultaneously fits tightly against the outer wall of the endoscope insertion part, blocking the bidirectional leakage path between the infusion fluid and the external air, and achieving airtight isolation between the endoscope body and the sleeve; the front sealing ring 26 provides constant damping when the knob is rotated, preventing the infusion pressure from leaking out along the threaded pair and blocking contaminants from entering the screw area, ensuring that the adjusting knob 23 rotates smoothly for a long time, thereby meeting the requirements of intramural sealing and operation feel without adding additional sealing components.

[0045] This invention features a two-stage independent sealing structure on the inner side of the head fixing ring. The rear sealing ring achieves airtight isolation between the endoscope and the protective sleeve, while the front sealing ring provides constant damping and anti-contamination, meeting the requirements for sealing during intraendoscopic infusion and operational feel.

[0046] Example 2 like Figure 1-3 As shown, according to one embodiment of the present invention, a retractable protective sleeve 2 for use under an endoscope includes: a protective sleeve body and an adjustment part; The protective sleeve body has a duckbill 21 at one end and an adjustment part at the other end; under the control of the adjustment part, the overall length of the telescopic protective sleeve 2 can be adjusted, thereby changing the relative distance between the duckbill 21 and the endoscope head 1.

[0047] The adjustment part includes: a head fixing ring 22, an adjustment knob 23, a limit flange 24, a pin 25, a front sealing ring 26, a rear sealing ring 27, an adjustment block 28, and a pin 30; The protective sleeve body can slide axially relative to the limiting flange 24. At least two limiting grooves 29 are provided on the end of the protective sleeve body opposite to the duck tongue 21. The limiting flange 24 is provided with pin holes that match the position and number of the limiting grooves 29. One end of the pin 25 passes through the limiting groove 29 and the pin hole, limiting the connection between the limiting flange 24 and the protective sleeve body. The groove width of the limiting groove 29, the inner diameter of the pin hole, and the nominal diameter of the pin 25 are matched and a clearance fit is adopted to ensure smooth sliding without significant shaking. The protective sleeve body moves axially along the length of the limiting groove 25 without rotating.

[0048] An adjusting block 28 is welded to the end of the protective sleeve body on the same side as the limiting flange 24. The adjusting block 28 has a ring structure, with the inner side welded to the outer side of the protective sleeve body and the outer side provided with external threads. A circumferential front sealing groove and a rear sealing groove are provided along the inner side of the head fixing ring 22. A front sealing ring 26 is provided in the front sealing groove and a rear sealing ring 27 is provided in the rear sealing groove.

[0049] The protective sleeve body is coaxially embedded inside the head fixing ring 22, and the inner side of the rear sealing ring 27 abuts against the protective sleeve body; when the retractable protective sleeve 2 is inserted into the endoscope 1, the sealing effect of the rear sealing ring 27 ensures the airtightness of the connection between the endoscope 1 and the retractable protective sleeve 2.

[0050] The adjusting knob 23 is hollow inside and has an internal thread on its inner wall that matches the external thread of the adjusting block 28. A limiting groove 31 is provided on the inner circumferential side of the rear end of the adjusting knob 23. The front end of the head fixing ring 22 is inserted into the limiting groove 31 and rotates with the adjusting knob 23. A positioning hole is provided on the outer wall of the adjusting knob 23, and an annular positioning groove 32 that matches the positioning hole is provided on the outer wall of the head fixing ring 22. One end of the pin 30 passes through the positioning hole and connects with the positioning groove 32 inside the limiting groove 31, so that the adjusting knob 23 and the head fixing ring 22 can only rotate axially. The front sealing ring 26 in the front sealing groove abuts against the adjusting knob 23. The sealing effect of the front sealing ring 26 not only ensures the airtightness of the connection between the head fixing ring 22 and the adjusting knob 23, but also enhances the operating feel of rotating the adjusting knob 23 by increasing the rotation damping, making it easy to make fine adjustments.

[0051] The protective sleeve body is placed inside the endoscope 1, with the adjustment knob 23 and the head fixing ring 22 exposed at the tail of the endoscope. Rotating the adjustment knob 23 causes the adjustment block 28 to move axially in a linear motion driven by the internal thread of the adjustment knob 23. Furthermore, the pin 25 slides along the limiting groove 29, causing the protective sleeve body to move along the length direction of the endoscope 1, thereby changing the relative distance between the duckbill tongue 21 and the head of the endoscope 1, realizing the function of extending and retracting the length of the duckbill tongue 21; that is, when the adjustment knob 23 is rotated clockwise, the duckbill tongue 21 extends forward relative to the head of the endoscope 1; when the adjustment knob 23 is rotated counterclockwise, the length of the duckbill tongue 21 extending out of the head of the endoscope 1 is shortened.

[0052] This invention allows for flexible adjustment of the duckbill length based on the actual intraoperative situation, ensuring precise fit of the protective sheath to various bone or tissue locations. This provides stable and reliable support for the surgery, thereby optimizing surgical outcomes and effectively reducing surgical risks. Furthermore, this invention fully considers the ease of operation for medical staff, reducing the frequency of protective sheath changes, simplifying the surgical procedure, shortening surgical time, further ensuring patient safety, and improving overall medical efficiency and quality.

[0053] The application principle of this utility model is as follows: The process of applying the retractable protective sleeve used under endoscopy according to this utility model includes: Step S102: Insert the protective sleeve body into the limiting flange 24, and align the limiting groove 29 on the protective sleeve body with the pin hole on the limiting flange 24, and insert the pin 25. Step S104: Fix the adjusting block 28 to the end of the protective sleeve body away from the duck tongue 21; Step S106: Connect the head fixing ring 22 coaxially with the limiting flange 24, and install the front sealing ring 26 and the rear sealing ring 27 into the front sealing groove and the rear sealing groove of the limiting flange 24, respectively. Step S108: Align the limiting groove 31 of the adjusting knob 23 with the front end of the head fixing ring 22 and screw it in so that the internal thread of the adjusting knob 23 engages with the external thread of the adjusting block 28. Step S110: Press the pin 30 into the positioning hole of the adjusting knob 23 and lock it into the annular positioning groove 32 provided on the outer wall of the head fixing ring 22; Step S112: Insert the assembled retractable protective sleeve 2 into the end of the endoscope 1 and turn the adjustment knob 23 to make the duck tongue 21 extend and retract axially.

[0054] The application process of this utility model includes: inserting the protective sleeve body into the limiting flange 24 and aligning the limiting groove 29 with the pin hole, inserting the pin 25 so that the protective sleeve body can only slide axially; fixing the adjusting block 28 with external threads to the tail end of the sleeve body (e.g., by welding) to form a screw nut unit; coaxially connecting the head fixing ring 22 with the limiting flange 24, and pressing the front sealing ring 26 and the rear sealing ring 27 into the front and rear sealing grooves of the head fixing ring 22 respectively to achieve knob rotation sealing and mirror airtight isolation; fitting the limiting groove 31 of the adjusting knob 23 into the front end of the head fixing ring 22 and screwing it in, so that the internal thread of the adjusting knob 23... Engage the external thread of the adjusting block 28 to construct a rotary-linear conversion pair; press the pin 30 into the positioning hole of the adjusting knob 23 and lock it into the annular positioning groove 32 of the head fixing ring 22 to complete the axial locking of the knob, ensuring that it can only rotate circumferentially; insert the assembled telescopic protective sleeve 2 into the endoscope body channel from the tail end of the endoscope 1, rotate the adjusting knob 23, and the screw pair drives the protective sleeve body to move axially, thereby steplessly adjusting the relative extension of the duck tongue 21 and the endoscope 1 head end; the whole process is completed in one go outside the endoscope without the need for additional tools, and the sealing ring provides immediate damping and sealing to prevent irrigation fluid leakage, while avoiding the need to change instruments during the operation and shortening the operation time.

[0055] The retractable protective sleeve of this invention can be quickly and accurately connected to the endoscope, ensuring sealing and adjustment functions, avoiding the need to change instruments during surgery, and effectively shortening the operation time.

[0056] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

[0057] It should be understood that the sequence number of each step in the utility model content and embodiments does not absolutely mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the utility model embodiments.

Claims

1. A retractable protective sheath for use under an endoscope, characterized in that, include: Protective sleeve body and adjustment section; The protective sleeve body has a duckbill (21) at one end and is connected to the adjustment part at the other end; Under the control of the adjustment unit, the protective sleeve body can move axially relative to the endoscope (1) to adjust the relative extension amount of the duck tongue (21) and the front end of the endoscope (1); The adjustment unit includes: a head fixing ring (22), an adjustment knob (23), and a limiting flange (24); The protective sleeve body is connected to the limiting flange (24) at one end opposite to the duck tongue (21); the protective sleeve body can slide axially relative to the limiting flange (24); The head fixing ring (22) restricts the relative position of the limiting flange (24) and the adjusting knob (23); The adjustment knob (23) is rotatably connected to the protective sleeve body, and the relative position of the protective sleeve body and the limiting flange (24) can be controlled by rotating the adjustment knob (23).

2. The retractable protective sleeve used under endoscopy according to claim 1, characterized in that, The adjustment part also includes: a pin (25); The protective sleeve body is provided with a limiting groove (29) along the axial direction at the end opposite to the duck tongue (21). The limiting flange (24) is provided with pin holes that match the position and number of the limiting groove (29). One end of the pin (25) passes through the limiting groove (29) and the pin hole, and limits the connection between the limiting flange (24) and the protective sleeve body.

3. The retractable protective sleeve used under endoscopy according to claim 2, characterized in that: The groove width of the limiting groove (29), the inner diameter of the pin hole, and the nominal diameter of the pin (25) are matched and a clearance fit is adopted.

4. The retractable protective sleeve used under endoscopy according to claim 2, characterized in that: Multiple limiting grooves (29) may be provided circumferentially along the main body of the protective sleeve; The number of pin holes and the number of pins (25) match the number of limiting grooves (29).

5. The retractable protective sleeve used under endoscopy according to claim 1, characterized in that: The limiting flange (24) has a flange at its front end; the flange is axially clamped between the head fixing ring (22) and the adjusting knob (23) so that the limiting flange (24) is axially fixed relative to the head fixing ring (22).

6. The retractable protective sleeve used under endoscopy according to claim 1, characterized in that, The adjustment part further includes: an adjustment block (28) in a ring structure and a pin (30); The inner side of the adjusting block (28) is fixedly connected to the outer side of the protective sleeve body, and the outer side is provided with external threads; The adjustment knob (23) is hollow inside and its inner wall is provided with an internal thread that matches the external thread of the adjustment block (28); The adjustment knob (23) has a limiting groove (31) circumferentially arranged on the inner side of its rear end. The front end of the head fixing ring (22) is inserted into the limiting groove (31), and the limiting groove (31) is rotatably connected to the head fixing ring (22). The adjustment knob (23) has a positioning hole on its outer wall, and the head fixing ring (22) has an annular positioning groove (32) that matches the positioning hole on its outer wall. One end of the pin (30) passes through the positioning hole and connects with the positioning groove (32) inside the limiting groove (31), so that the adjustment knob (23) and the head fixing ring (22) can only rotate axially.

7. The retractable protective sleeve used under endoscopy according to claim 6, characterized in that: The outer wall of the adjustment knob (23) is provided with a plurality of positioning holes at equal intervals in a circumferential direction, and the number of pins (30) is the same as the number of positioning holes.

8. The retractable protective sleeve used under endoscopy according to claim 1, characterized in that: A circumferential front sealing groove and a rear sealing groove are provided along the inner side of the head fixing ring (22); A front sealing ring (26) is provided in the front sealing groove, and a rear sealing ring (27) is provided in the rear sealing groove. The inner side of the front sealing ring (26) elastically abuts against the adjustment knob (23), and the inner side of the rear sealing ring (27) elastically abuts against the main body of the protective sleeve.

9. The retractable protective sleeve used under endoscopy according to claim 8, characterized in that: When the retractable protective sleeve is connected to the endoscope (1), the rear sealing ring (27) further elastically abuts against the outer wall of the insertion part of the endoscope (1) to achieve airtight isolation between the endoscope (1) and the protective sleeve.

Images