A measuring device for cruciate ligament reconstruction in arthroscopic surgery

Abstract

The utility model discloses a kind of measuring devices for cross ligament reconstruction in arthroscopic surgery, including arthroscope connecting block and fixedly installed mirror tube, mirror tube is equipped with sliding cavity and multiple air bag cavities. Each air bag cavity is equipped with hose air bag, one end is fixed in cavity, the other end is connected with piston, piston is slidably installed in cavity and seals cavity. Hose air bag outside is equipped with reset spring, and multiple pistons are commonly connected with measuring hose. By independently controlling the air pressure of each hose air bag, driving piston generates different displacement, so that measuring hose realizes bending steering. The device solves the technical problem that existing rigid measuring tool cannot adapt to curved ligament stump, and through air pressure difference control, the adaptive matching of measuring hose and ligament form is realized, which avoids measurement error caused by forced pulling. Measuring hose can be flexibly adjusted under arthroscopic vision Bending angle, significantly improve measurement accuracy and surgical efficiency, provide more accurate measurement scheme for cross ligament reconstruction surgery.

Description

Technical Field

[0001] This utility model relates to the field of measuring device technology, and in particular to a measuring device for cruciate ligament reconstruction in arthroscopic surgery. Background Technology

[0002] Arthroscopic surgery is a minimally invasive surgical technique that involves inserting an arthroscope through a small incision (usually 5-10 mm) in the skin to visualize and manipulate the internal structures of the joint. Compared to traditional open surgery, arthroscopic surgery has advantages such as less trauma, faster recovery, and fewer complications, and has become the mainstream method for the diagnosis and treatment of diseases of the knee, shoulder, and other joints. Among knee joint diseases, the treatment of cruciate ligament injuries particularly relies on arthroscopic techniques.

[0003] The cruciate ligaments (including the anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL)) are core structures maintaining knee joint stability. When sports injuries or trauma lead to ligament rupture, due to the ligaments' low regenerative capacity, surgical reconstruction is necessary to restore knee joint stability. The knee joint has a small and complex internal space, making precise manipulation difficult in open surgery; the ligament stumps are located deep within the joint cavity, requiring the magnifying imaging capabilities of arthroscopy for clear visualization; and reconstruction surgery demands millimeter-level precision in ligament attachment points, achievable only through the minimally invasive nature of arthroscopy. Based on these factors, cruciate ligament reconstruction must be performed arthroscopically.

[0004] In a standard arthroscopic cruciate ligament reconstruction surgery, the surgeon first needs to clean the damaged ligament stump and then accurately measure the length and diameter of the stump in order to select a suitable graft (such as autologous tendon or artificial ligament). This measurement step has a decisive impact on the success or failure of the surgery.

[0005] Currently, commonly used clinical tools for measuring ligament stump length include rigid rulers and calipers. Furthermore, Chinese Patent Publication No. CN222217830U, published on December 24, 2024, discloses an arthroscopic anterior cruciate ligament stump measuring device. This device features an endoscope tube mounted on one side of the arthroscopy connecting block, which is fitted over the arthroscope. The endoscope tube has an internal sliding cavity containing a return spring rope and a piston pad. One end of the return spring rope is connected to one side of the piston pad. A rigid, linear measuring tube is mounted on one side of the piston pad, with graduations on its outer side. A telescopic air tube is also mounted on the outer side of the endoscope tube. In use, the endoscope connector mounted on one side of the arthroscopy connecting block is connected to the observation device. The endoscope tube and the arthroscope inside the tube are then inserted into the patient's body, and the arthroscope is used to observe the patient's internal organs. When it is necessary to measure the ligament stump, the telescopic air tube is connected to an air pump. The air pump supplies air to the interior of the sliding cavity, increasing the pressure inside the cavity. When the pressure inside the cavity increases, the piston pad slides outward, thus squeezing the measuring tube installed at one end of the piston pad out of the cavity. Since the measuring tube has scale lines on the outside and is transparent, the values ​​of the scale lines can be clearly observed through the endoscope, thereby obtaining the length of the ligament stump.

[0006] The aforementioned measuring tools are all rigid, linear structures. However, in arthroscopic surgery, cruciate ligament stumps often exhibit varying degrees of curvature due to injury or degeneration. Existing rigid, linear measuring tools cannot accommodate the common curvature patterns of ligament stumps, often requiring forced ligament traction or reliance on experience-based estimations during measurement. This is not only inconvenient but may also introduce significant errors, leading to data distortion. These problems severely impact measurement accuracy, potentially resulting in inappropriate graft selection and consequently affecting postoperative knee joint stability. Utility Model Content

[0007] The purpose of this invention is to provide a measuring device for cruciate ligament reconstruction in arthroscopic surgery, in order to solve the technical problem that existing rigid, linear measuring tools cannot adapt to the common bending morphology of ligament remnants, thus affecting the accuracy of measurement.

[0008] The technical problem solved by this utility model can be achieved by the following solutions: A measuring device for cruciate ligament reconstruction in arthroscopic surgery includes an arthroscopic connecting block and an endoscope tube fixedly mounted on the arthroscopic connecting block. The endoscope tube has a sliding cavity inside. Multiple air bladder cavities communicating with the sliding cavities are also located inside the endoscope tube. Each air bladder cavity contains a flexible tubing air bladder. One end of each flexible tubing air bladder is fixedly connected to the air bladder cavity, and the other end is fixedly connected to a piston. The piston is slidably mounted within the air bladder cavity and can seal the air bladder cavity. A return spring is fitted on the outside of each flexible tubing air bladder, with one end fixed to the air bladder cavity and the other end fixed to the piston. Multiple pistons are fixedly connected to one end of the same measuring tubing. When the flexible tubing air bladder is inflated or deflated, it can drive the piston to slide within the air bladder cavity, thereby causing the measuring tubing to extend or retract into the sliding cavity. By controlling the air pressure within different flexible tubing air bladders, the measuring tubing can be driven to bend and steer.

[0009] Furthermore, each hose airbag is connected to a proportional pressure valve via a connecting tube, which controls the air pressure inside the hose airbag.

[0010] Furthermore, the plurality of the aforementioned flexible airbags are arranged in a circumferential array centered on the axis of the endoscope tube.

[0011] Furthermore, the number of airbag cavities is four, and each airbag cavity contains a flexible tubing airbag.

[0012] Furthermore: the piston includes a piston block fixedly connected to the hose airbag and the return spring, and a piston rod fixedly connected to the piston block. The piston block is slidably installed in the airbag cavity and contacts the inner wall of the airbag cavity. The piston rod is fixedly connected to the measuring hose.

[0013] Furthermore, the airbag cavity has a limiting block at one end near the sliding cavity, and the piston block of the piston can contact the limiting block when it slides towards the sliding cavity within the airbag cavity.

[0014] Furthermore, each hose airbag is connected to an air pump that inflates the hose airbag via a connecting tube.

[0015] Furthermore, the pressure adjustment range of the proportional pressure valve is 0-0.5 MPa.

[0016] Furthermore, the measuring hose is equipped with a measuring scale, and the measuring range of the measuring hose is 0-80mm.

[0017] Furthermore, the measuring hose is made of transparent polyurethane material.

[0018] This invention provides a measuring device for cruciate ligament reconstruction in arthroscopic surgery. Through a flexible measuring tube structure and independent control of multiple tubular airbags, it effectively solves the technical problem that rigid, linear measuring tools in the prior art cannot adapt to curved ligament stumps. When the air pressure in the different tubular airbags of this device is independently adjusted, the expansion degree of each airbag varies, pushing the corresponding piston to produce different displacements. This asynchronous movement of multiple pistons causes the measuring tube to bend and deform. That is, by controlling the air pressure distribution within the different tubular airbag cavities, differentiated driving forces are formed. When the inflation pressure of one side's tubular airbag increases, the corresponding piston moves a greater distance, while if the airbag on the opposite side maintains a lower air pressure, its piston displacement is smaller. This displacement difference directly causes the measuring tube to bend towards the lower-pressure side. The independent air pressure adjustment function of each tubular airbag allows the measuring tube to bend and turn, thus adapting to the curved shape of the ligament stump. Compared with existing rigid, linear measuring tools, this measuring device avoids measurement errors caused by forcibly pulling the ligament or relying on experience estimation in traditional measurements, significantly improving the accuracy of the measurement data. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a measuring device for cruciate ligament reconstruction in arthroscopic surgery according to the present invention; Figure 2 This is a top view of a measuring device for cruciate ligament reconstruction in arthroscopic surgery according to the present invention; Figure 3 yes Figure 1 Enlarged view of a portion at point A; Figure 4 yes Figure 2 Front view of the internal structure after being cut open from the BB direction; Figure 5 yes Figure 2 Schematic diagram of the internal structure after being cut open from the BB direction; Figure 6 yes Figure 4 A magnified view of a portion at point C; Figure 7 yes Figure 4 A magnified view of a portion at point D; Figure 8 yes Figure 4 A magnified view of a portion at point E; Figure 9 This is a schematic diagram of the internal structure of the piston of a measuring device for cruciate ligament reconstruction in arthroscopic surgery according to this utility model. Figure 10 yes Figure 2 A schematic diagram of the structure after being cut open from the FF direction, with the return spring removed from the diagram; Main components and designations: Arthroscopy connecting block: 1; Endoscope connecting seat: 11; Endoscope tube: 2; Slide cavity: 21; Air bladder cavity: 22; Limiting block: 221; Flexible air bladder: 3; Piston: 4; Piston block: 41; Piston rod: 42; Return spring: 5; Measuring hose: 6; Connecting tube: 7; Proportional pressure valve: 8. Detailed Implementation

[0021] To make the objectives, technical solutions and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0022] Figure 1 , Figure 2 This is a structural diagram of a measuring device for cruciate ligament reconstruction in arthroscopic surgery, as described in this embodiment. Figure 1 , 2 As shown, the measuring device includes an arthroscopy connecting block 1 and an endoscope tube 2 fixedly mounted on the arthroscopy connecting block 1. An endoscope connecting seat 11 is also fixedly mounted on one side of the arthroscopy connecting block 1. The endoscope tube 2 is used to fit and fix the arthroscopy to the outside of the endoscope. Figure 3 As shown, a sliding cavity 21 is provided inside the endoscope tube 2. The sliding cavity 21 is located between the outer wall and the inner wall of the endoscope tube 2, as follows: Figure 4-6 As shown, the endoscope tube 2 also has multiple air bladder cavities 22 connected to the sliding cavity 21 (shown in...). Figure 6 (in the middle), each airbag cavity 22 contains a flexible tubular airbag 3, such as Figure 6 , 7 As shown, one end of each flexible airbag 3 is fixedly connected to the inner wall of the airbag cavity 22, and the other end is fixedly connected to a corresponding piston 4. The piston 4 is slidably installed inside the airbag cavity 22 and can seal the airbag cavity 22. A return spring 5 is sleeved on the outside of each flexible airbag 3, such as... Figure 4 , 6 As shown in Figure 7, one end of the return spring 5 is fixedly connected to the inner wall of the airbag cavity 22, and the other end is fixedly connected to the piston 4, as follows. Figure 8 As shown, multiple pistons 4 are all fixedly connected to one end of the same measuring hose 6, and the measuring hose 6 is in telescopic cooperation with the mirror tube 2.

[0023] When the tubing balloon 3 is inflated, the expansion drives the piston 4 to slide towards the sliding cavity 21 within the balloon cavity 22, thereby allowing the measuring tubing 6 to extend out of the sliding cavity 21 for measurement. When the tubing balloon 3 deflates, the piston 4 slides in the opposite direction within the balloon cavity 22 under the elastic force of the return spring 5, thereby retracting the measuring tubing 6 into the sliding cavity 21. This prevents the measuring tubing 6 from interfering with the surgical area during surgical procedures and also protects it from damage. By controlling the air pressure within the tubing balloon 3, the measuring tubing 6 can be driven to bend and steer.

[0024] The measuring device for cruciate ligament reconstruction in arthroscopic surgery provided in this embodiment involves inserting the endoscope tube 2 and the arthroscope housed within the endoscope tube 2 into the patient's body to observe the patient's internal organs. When it is necessary to measure the ligament stump, air is supplied to the tubular balloon 3. After the tubular balloon 3 inflates, it drives the piston 4 to slide within the balloon cavity 22, thereby pushing the measuring tubular tube 6 out of the sliding cavity 21. When it is necessary to bend the measuring tubular tube 6 to adapt to the bending shape of the ligament stump, the air pressure in each tubular balloon 3 is adjusted independently. The different degrees of inflation of each tubular balloon 3 push the corresponding piston 4 to produce different displacements. The asynchronous movement of multiple pistons 4 causes the measuring tubular tube 6 to bend and deform. That is, by controlling the air pressure distribution in the cavities of different tubular balloons 3, differentiated driving forces are formed. For example, when the inflation pressure of the tubular balloon 3 on one side increases, the movement distance of the corresponding piston 4 increases, while if the tubular balloon 3 on the opposite side maintains a lower air pressure, the displacement of its piston 4 is smaller. This displacement difference directly causes the measuring tubular tube 6 to bend towards the low-pressure side. After the measurement is completed, the air bladder 3 of the flexible tube is deflated, and under the elastic force of the return spring 5, the piston 4 slides and drives the measuring flexible tube 6 to be retracted into the sliding cavity 21 of the mirror tube 2.

[0025] In order to supply air to the hose airbag 3, such as Figure 6 As shown, each flexible airbag 3 is fixedly installed with a connecting tube 7, which extends to the outside of the endoscope tube 2. Each flexible airbag 3 is connected to an air pump that can inflate the flexible airbag 3 through the connecting tube 7. The air pump is not shown in the figure.

[0026] In order to independently adjust the air pressure inside each hose airbag 3, such as Figure 6 As shown, each flexible airbag 3 is connected to a proportional pressure valve 8 via a connecting pipe 7, which controls the air pressure inside the flexible airbag 3. A proportional pressure valve is a conventional control component that continuously adjusts air pressure via an electrical signal. This valve receives an electrical signal and proportionally adjusts the output pressure to achieve precise control of the internal pressure of a flexible pressure vessel (such as an airbag). In this embodiment, a conventional proportional pressure valve is used. Furthermore, the air pressure adjustment range of the proportional pressure valve 8 in this embodiment is 0-0.5 MPa.

[0027] Regarding the arrangement of the flexible airbag 3, such as Figure 10 As shown, the plurality of the tubular airbags 3 are arranged in a circular array with the axis of the endoscope tube 2 as the center. Further, as shown in the figure, there are four airbag cavities 22, and each airbag cavity 22 contains one tubular airbag 3.

[0028] When using the measuring device of this embodiment, such as Figure 10 As shown, the four flexible airbags 3 are labeled as flexible airbag G, flexible airbag H, flexible airbag I, and flexible airbag J, respectively. Flexible airbags G and I are positioned opposite each other and used in conjunction, as are flexible airbags H and J. When flexible airbags G, H, I, and J are all inflated and their pressures are equal, multiple pistons 4 corresponding to each flexible airbag 3 slide with the same displacement, pushing the measuring hose 6 out of the sliding cavity 21. When flexible airbags G and I are inflated and their pressures are unequal, the movement of pistons 4 causes the measuring hose 6 to bend and rotate around the y-axis, bending towards the lower pressure side of flexible airbags G and I. When flexible airbags H and J are inflated and their pressures are unequal, the movement of pistons 4 causes the measuring hose 6 to bend and rotate around the x-axis, bending towards the lower pressure side of flexible airbags H and J. When the air pressures of hose airbags G and I are unequal, and the air pressures of hose airbags H and J are also unequal, the movement of piston 4 causes the measuring hose 6 to bend and rotate around the x-axis and y-axis simultaneously.

[0029] Of course, in other embodiments, other numbers of hose airbags 3 can be provided, such as six, eight, or ten hose airbags 3. The more hose airbags 3 there are, the higher the accuracy of bending control for the measuring hose 6.

[0030] Regarding the specific structural form of piston 4, such as Figure 4 As shown, the piston 4 includes a piston block 41 and a piston rod 42 fixedly connected to the piston block 41, as follows: Figure 7 As shown, the piston block 41 is fixedly connected to the hose airbag 3 and the return spring 5, and the piston block 41 is slidably installed inside the airbag cavity 22 and in contact with the inner wall of the airbag cavity 22, as shown. Figure 8 As shown, the piston rod 42 is fixedly connected to the measuring hose 6.

[0031] like Figure 8 , 9As shown, in order to prevent the piston 4 from falling out of the airbag cavity 22 when sliding, a limiting block 221 is provided at one end of the airbag cavity 22 near the sliding cavity 21. When the piston block 41 of the piston 4 slides towards the sliding cavity 21 in the airbag cavity 22, it can contact the limiting block 221. After the piston block 41 contacts the limiting block 221, it cannot continue to slide out of the airbag cavity 22 under the limiting action of the limiting block 221.

[0032] To facilitate measurement, the measuring hose 6 is equipped with a measuring scale. Furthermore, in this embodiment, the measuring hose 6 has a measuring range of 0-80 mm to meet the needs of most cruciate ligament reconstructions. Scale lines are laser-engraved every 0.5 mm on the outer surface of the measuring hose 6. Furthermore, the measuring hose 6 is made of transparent polyurethane material. By observing the scale on the transparent measuring hose 6, the operator can accurately read the measurement data, thereby determining the length of the ligament stump and the required graft length.

[0033] The measuring device for cruciate ligament reconstruction in arthroscopic surgery provided in this embodiment is used by connecting the endoscope connector 11 installed on one side of the arthroscope connector block 1 to the observation device. The endoscope tube 2 and the arthroscope sleeved in the endoscope tube 2 are inserted into the patient's body, and the arthroscope in the endoscope tube 2 is used to observe the patient's body. When it is necessary to measure the ligament stump, air is supplied to the tubular air bladder 3. After the air bladder 3 inflates, it drives the piston 4 to slide within the air bladder cavity 22, thereby pushing the measuring tubular tube 6 out of the sliding cavity 21. When it is necessary to bend the measuring tubular tube 6 to adapt to the bending shape of the ligament stump, the air pressure in each tubular air bladder 3 is independently adjusted by the proportional pressure valve 8. The different degrees of inflation of each tubular air bladder 3 push the corresponding piston 4 to produce different displacements. The asynchronous movement of multiple pistons 4 causes the measuring tubular tube 6 to bend and deform. That is, by controlling the air pressure distribution in the different tubular air bladder cavities 3, differentiated driving forces are formed. For example, when the inflation pressure of one side of the hose bladder 3 increases, the corresponding piston 4 moves a greater distance. Conversely, if the pressure of the opposite side's hose bladder 3 remains low, the displacement of its piston 4 is smaller. This displacement difference directly causes the measuring hose 6 to bend towards the lower-pressure side. Specifically: when hose bladders G and I are inflated and their pressures are unequal, the movement of piston 4 causes the measuring hose 6 to bend around the y-axis, and the measuring hose 6 bends towards the lower-pressure side of hose bladders G and I. When hose bladders H and J are inflated and their pressures are unequal, the movement of piston 4 causes the measuring hose 6 to bend around the x-axis, and the measuring hose 6 bends towards the lower-pressure side of hose bladders H and J. When the pressures of hose bladders G and I are unequal, and the pressures of hose bladders H and J are also unequal, the movement of piston 4 causes the measuring hose 6 to bend around both the x-axis and y-axis simultaneously. After the measurement is completed, the air bladder 3 of the hose is deflated by the proportional pressure valve 8. Under the elastic force of the return spring 5, the piston 4 slides and drives the measuring hose 6 to be drawn into the sliding cavity 21 of the mirror tube 2.

[0034] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A measuring device for cruciate ligament reconstruction in arthroscopic surgery, comprising an arthroscopic connecting block (1) and an endoscope tube (2) fixedly mounted on the arthroscopic connecting block (1), wherein a slurry cavity (21) is provided inside the endoscope tube (2). Its features are: The endoscope tube (2) is also provided with multiple air bladder cavities (22) that are connected to the sliding cavity (21). Each air bladder cavity (22) contains a flexible air bladder (3). One end of each flexible air bladder (3) is fixedly connected to the air bladder cavity (22), and the other end is fixedly connected to a piston (4). The piston (4) is slidably installed in the air bladder cavity (22) and can seal the air bladder cavity (22). Each flexible air bladder (3) is fitted with a return spring (5) with one end fixed to the air bladder cavity (22) and the other end fixed to the piston (4). Multiple pistons (4) are fixedly connected to the same measuring hose (6). When the flexible air bladder (3) is inflated or deflated, it can drive the piston (4) to slide in the air bladder cavity (22), thereby causing the measuring hose (6) to extend or retract into the sliding cavity (21). By controlling the air pressure in different flexible air bladders (3), the measuring hose (6) can be driven to bend and turn.

2. The measuring device for cruciate ligament reconstruction in arthroscopic surgery according to claim 1, characterized in that: Each hose airbag (3) is fixedly installed with a connecting tube (7), and each hose airbag (3) is connected to a proportional pressure valve (8) that can control the air pressure inside the hose airbag (3) through the connecting tube (7).

3. The measuring device for cruciate ligament reconstruction in arthroscopic surgery according to claim 1, characterized in that: Multiple of the aforementioned flexible airbags (3) are arranged in a circular array with the axis of the endoscope tube (2) as the center.

4. The measuring device for cruciate ligament reconstruction in arthroscopic surgery according to claim 3, characterized in that: The number of airbag cavities (22) is four, and each airbag cavity (22) contains a flexible tube airbag (3).

5. The measuring device for cruciate ligament reconstruction in arthroscopic surgery according to claim 1, characterized in that: The piston (4) includes a piston block (41) fixedly connected to the hose airbag (3) and the return spring (5) and a piston rod (42) fixedly connected to the piston block (41). The piston block (41) is slidably installed in the airbag cavity (22) and in contact with the inner wall of the airbag cavity (22). The piston rod (42) is fixedly connected to the measuring hose (6).

6. The measuring device for cruciate ligament reconstruction in arthroscopic surgery according to claim 5, characterized in that: The airbag cavity (22) has a limiting block (221) at one end near the sliding cavity (21), and the piston block (41) of the piston (4) can contact the limiting block (221) when it slides in the airbag cavity (22) toward the sliding cavity (21).

7. The measuring device for cruciate ligament reconstruction in arthroscopic surgery according to claim 2, characterized in that: Each hose airbag (3) is connected to an air pump that can inflate the hose airbag (3) via a connecting tube (7).

8. The measuring device for cruciate ligament reconstruction in arthroscopic surgery according to claim 2, characterized in that: The pressure adjustment range of the proportional pressure valve (8) is 0-0.5MPa.

9. The measuring device for cruciate ligament reconstruction in arthroscopic surgery according to claim 1, characterized in that: The measuring hose (6) is provided with a measuring scale, and the measuring range of the measuring hose (6) is 0-80mm.

10. The measuring device for cruciate ligament reconstruction in arthroscopic surgery according to claim 1, characterized in that: The measuring hose (6) is made of transparent polyurethane material.

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