Double-end linkage type diameter-length synchronous measuring device for interventional operation

Abstract

The invention relates to the technical field of medical instruments, in particular to a double-end linkage type diameter-length synchronous measuring device for interventional operation, which comprises a catheter, a hydraulic driving mechanism and a measuring block arranged at the front end of the catheter. The measuring block is provided with a plurality of extension measuring devices capable of expanding radially along the side wall, and the extension measuring devices are driven by a hydraulic transmission system to act synchronously. According to the device, the surface contact type measurement principle is adopted, the minimum diameter of a lumen can be measured at a time in single operation, multi-point serialization measurement of a lesion area is completed, and synchronous acquisition of the lesion length is achieved in combination with displacement sensing. The device adapts to lumen structures with different tube diameters and forms through modular design, is particularly suitable for accurate morphological data acquisition of narrow or irregular lumens such as bronchus, alimentary canal, blood vessel and urethra, and effectively solves the technical problems that the real narrowest point is easy to omit, the operation is complicated and the data is single in the traditional point contact measurement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a double-end linkage type diameter-length synchronous measurement device for interventional surgery. BACKGROUND

[0002] In the field of interventional medicine, accurate measurement of morphological parameters of in-vivo tubular structures (such as blood vessels, bronchi, bile ducts, pancreatic ducts, digestive tracts, urethras, etc.) is a key prerequisite for implementing precise diagnosis and treatment decisions. For example, in respiratory endoscopic diagnosis and treatment, the diameter and affected range of a narrow bronchus need to be measured to plan the interventional scheme under the bronchoscope or evaluate the feasibility of stent placement; in vascular interventional surgery, the lesion length and minimum diameter of a narrow blood vessel need to be quantitatively evaluated to accurately select the expansion diameter and length of the balloon or match the most appropriate stent size; in addition, in many lumen interventional operations such as esophagus, intestine, bile duct, ureter, etc., the diameter and length measurement of tubular structures is also directly related to the selection of surgical instruments, the planning of surgical paths, and the final treatment effect. However, existing measurement methods mostly rely on offline estimation of preoperative images or visual comparison during surgery, which has the problems of complicated operation, data lag, strong subjectivity, and difficulty in achieving synchronous, real-time, and accurate linkage measurement of diameter and length during surgery. Therefore, there is an urgent need for a special device that can adapt to different anatomical sites and different tube diameters, and can achieve double-end linkage and synchronous rapid measurement of diameter and length during surgery.

[0003] After searching, it is found that there are some lumen measurement devices in the prior art, such as the point contact or local line contact measurement probe represented by the opening and closing device for assisting bronchoscope to measure tracheal diameter disclosed in Chinese invention patent (CN114081428B). Due to the inherent limitations of its working principle, such devices cannot directly identify the minimum diameter of the lesion site of the tubular structure in a single action, and it is also difficult to efficiently complete the rapid and consecutive sequential measurement of multiple points in the lesion area. Specifically, the operator has to guide the probe to slowly and repeatedly "scan point by point", and passively search for the narrowest point by manually comparing multiple readings; if the diameters of multiple positions need to be obtained to evaluate the lesion range, the above tedious process needs to be repeated. This mode not only has a complicated operation and significantly prolongs the operation time, but also highly depends on the subjective experience and patience of the operator, which makes it difficult to ensure the repeatability and accuracy of the measurement results. Therefore, there is an urgent need for a new type of measurement device that can overcome the disadvantages of the "point-by-point scanning" mode and has the dual capabilities of "one-time capture of the narrowest point" and "efficient sequential measurement of the lesion area". This demand is particularly urgent in tubular lumen interventional surgeries such as bronchi, digestive tracts, and urethras, where the narrowest point and the lesion range need to be synchronously evaluated.

[0004] Therefore, the applicant provides a double-end linkage type diameter-length synchronous measurement device for interventional surgery, which can not only identify and lock the minimum diameter of the lumen at once in one contact, but also efficiently and continuously complete the sequential diameter measurement of multiple preset points in the lesion area, and realize the synchronous and accurate measurement of diameter and length. This provides a convenient measurement solution for the interventional surgery of bronchial, digestive tract, urethra and other tubular structures. SUMMARY

[0005] The purpose of the present application is to provide a double-end linkage type diameter-length synchronous measurement device for interventional surgery, which can accurately measure the minimum diameter of the lumen at one time through face contact measurement and double-end linkage structure, and can efficiently complete the sequential measurement of multiple points in the lesion area, thereby providing a "one-touch" and accurate synchronous measurement solution for interventional surgery, and greatly improving the diagnosis and treatment efficiency and decision accuracy.

[0006] The present application is realized as follows: a double-end linkage type diameter-length synchronous measurement device for interventional surgery, comprising a catheter, a hydraulic drive mechanism and a measurement block connected to the two ends of the catheter, a hydraulic transmission mechanism and a plurality of extension measurement devices arranged in the measurement block, a power input end of the hydraulic transmission mechanism connected to the catheter, for transmitting power from the hydraulic drive mechanism to the extension measurement devices, so that the extension measurement devices extend outward to measure the inner diameter of the body tubular structure.

[0007] Further, the hydraulic drive mechanism comprises a hydraulic cylinder, a piston and a pull rod; the end of the hydraulic cylinder is connected to the catheter, the piston is sealingly and slidingly arranged in the hydraulic cylinder, and the end of the pull rod is fixedly connected to the piston.

[0008] Further, the extension measurement device comprises an extension plate and an extension arm, the extension plate is embedded in the side wall of the measurement block and flush with the side wall of the measurement block when not measuring; the end of the extension arm is fixedly connected to the extension plate and slidingly arranged in the hydraulic transmission mechanism; the hydraulic transmission mechanism drives the extension plate and the extension arm to extend outward under the action of hydraulic pressure.

[0009] Further, the hydraulic transmission mechanism is a sealed cavity, the extension arms of the plurality of extension measurement devices are sealingly and slidingly in contact with the inner side wall of the cavity; at the same time, the cavity is in communication with the catheter, the hydraulic transmission mechanism is a sealed cavity; the extension arms of the plurality of extension measurement devices are sealingly and slidingly in contact with the inner side wall of the cavity; at the same time, the cavity is in communication with the catheter; the side wall of the extension plate of the plurality of extension measurement devices is embedded with a pressure sensor.

[0010] Further, the hydraulic transmission mechanism comprises a wedge-shaped block and a reset unit; the wedge-shaped block is sealingly and slidably arranged on the inner side wall of the measuring block, a sealed cavity is formed between the top surface of the wedge-shaped block and the measuring block, and the sealed cavity is communicated with the conduit; the side wall of the wedge-shaped block is connected with the end of the stretching arm, and the reset unit is arranged between the wedge-shaped block and the stretching arm, and the reset unit can make the stretching measuring device return to the initial position.

[0011] Further, the reset unit is a plurality of sliding grooves which are the same in number as the stretching measuring devices; the sliding grooves are arranged on the inclined surface of the wedge-shaped block, and the end of the stretching arm is sealingly and slidably arranged in the sliding grooves and is limited by the sliding grooves.

[0012] Further, the reset unit is a plurality of springs which are the same in number as the stretching measuring devices; the springs are sleeved on the stretching arm, one end of the spring is fixedly connected with the inner side wall of the measuring block, and the other end is fixedly connected with the side wall of the stretching arm.

[0013] Further, the hydraulic transmission mechanism comprises a support plate, a rotating sheet, a rotating rod, a sleeve and a limiting block; the stretching arm is sealingly and slidably arranged on the support plate, the top of the support plate is rotationally connected with the bottom of the rotating sheet, the top of the rotating sheet is fixedly connected with the rotating rod, and the sleeve is sleeved on the rotating rod; the side wall of the rotating rod is provided with a spiral groove, and the limiting block is fixedly installed on the inner side wall of the sleeve and is sealingly and slidably arranged in the spiral groove; the sleeve is sealingly and slidably arranged, and a sealed cavity is formed between the top of the sleeve and the conduit; The rotating sheet is provided with a plurality of arc-shaped grooves which are the same in number as the stretching measuring devices, and the top of the stretching arm is sealingly and slidably arranged in the arc-shaped grooves.

[0014] Further, the stretching measuring device comprises a plurality of measuring rods and a plurality of measuring plates; one end of the measuring rod is hingedly connected with the side wall of the conduit, and the other end is hingedly connected with the end of the measuring plate.

[0015] Further, the hydraulic transmission mechanism comprises a sealing block, a connecting rod, a sliding sleeve and a plurality of groups of transmission rods; the sealing block is sealingly and slidably arranged in the conduit, the end of the connecting rod is connected with the sealing block, the sliding sleeve is sealingly and slidably sleeved on the outer side wall of the conduit, and the inner side wall of the sliding sleeve is fixedly connected with the connecting rod; one end of each group of the transmission rods is rotationally connected with the outer side wall of the sliding sleeve, each group of the transmission rods is two in number, and the ends of the two transmission rods away from the sliding sleeve are respectively rotationally connected with the corresponding measuring rod and the measuring plate.

[0016] Compared with the prior art, the present application has the following beneficial effects: 1、The device overcomes the limitations of existing point contact measurement technology in narrow lumen shape evaluation through the innovative design of face contact measurement and double-end linkage structure. The device can accurately identify the minimum diameter of the lumen in a single operation, avoiding the problem of missing the true narrowest point due to local contact in traditional methods, while supporting efficient sequential measurement of the lesion area and simultaneously obtaining diameter and length data. In particular, the use of hydraulic transmission further enhances the adaptability of the device to different pipe diameters and complex shapes, making the operation more flexible and stable. Overall, this design significantly simplifies the operation process, reduces the dependence on operator experience, provides more comprehensive and accurate data support for interventional surgery, and effectively improves the efficiency and reliability of diagnosis and treatment; 2、The device is provided with a plurality of groups of stretching measurement devices distributed circumferentially on the side wall of the measuring block. Under the drive of the hydraulic transmission mechanism, each group of units can respectively stretch outward along different radial directions synchronously or step by step, thereby realizing multi-directional synchronous detection of irregular lumen shape. This structural design not only quickly locates the narrowest diameter direction of the narrow lumen, but also simultaneously obtains the minimum diameter value in that direction, providing important morphological basis and directional reference for subsequent stent implantation, balloon dilation and other treatment operations, significantly improving the pertinence and safety of interventional therapy; 3、The stretching arm is slidably arranged in the cavity of the measuring block through a sealing structure, and a pressure sensor is embedded on the outer side wall of each stretching plate. Under the drive of the hydraulic transmission mechanism, each group of stretching plates can independently move along different radial directions until their outer side walls tightly fit the inner side wall of the irregular lumen. This design enables the device to simultaneously obtain accurate inner diameter values in multiple directions of the lumen, thereby constructing comprehensive lumen diameter morphological data. Based on these multi-directional inner diameter data, the actual cross-sectional shape of the lumen can be further reconstructed according to the control system, providing key morphological basis for subsequent selection of interventional instruments, determination of placement position and optimization of surgical plan; 4、The end of the measuring rod is connected to the outer side wall of the catheter through rotation, and a linkage mechanism composed of a transmission rod and a sliding sleeve is arranged between the measuring rod and the catheter body. This design not only realizes the synchronous measurement of pipe diameter size and lesion length, but also significantly reduces the overall passing diameter of the device through the folding storage design. This structural optimization enables the device to be applicable to vascular and other highly demanding lumen interventional surgery scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic diagram of a double-end linkage type diameter-length synchronous measurement device for interventional surgery provided by Embodiment 1 of the present application; Figure 2 is a structural schematic diagram of a hydraulic drive mechanism provided by Embodiment 1 of the present application; Figure 3is a horizontal sectional view of the measuring block provided by embodiment 1 of the present application; Figure 4 is a schematic diagram of the internal structure of the measuring block provided by embodiment 2 of the present application; Figure 5 is a horizontal sectional view of the measuring block provided by embodiment 2 of the present application; Figure 6 is a schematic diagram of the internal structure of the measuring block provided by embodiment 3 of the present application; Figure 7 is a horizontal sectional view of the measuring block provided by embodiment 4 of the present application (top view of the hydraulic transmission mechanism); Figure 8 is a horizontal sectional view of the measuring block provided by embodiment 4 of the present application (top view of the hydraulic transmission mechanism in the position of the support plate); Figure 9 is a schematic diagram of the internal structure of the measuring block provided by embodiment 4 of the present application; Figure 10 is a schematic diagram of the structure of the extension measuring device provided by embodiment 5 of the present application; Figure 11 is Figure 10 a sectional view at A-A in the figure; Figure 12 is a schematic diagram of the structure of the extension measuring device provided by embodiment 6 of the present application.

[0018] Reference signs involved in the above figures: 1, measuring block; 2, guide pipe; 3, hydraulic cylinder; 4, pull rod; 5, pull rope; 6, piston; 7, extension plate; 8, extension arm; 9, cavity; 10, wedge block; 11, spring; 12, sliding groove; 13, rotating piece; 14, limiting column; 15, rotating rod; 16, arc-shaped groove; 17, support plate; 18, limiting block; 19, measuring scale; 20, helical groove; 21, sleeve; 22, measuring rod; 23, transmission rod; 24, sliding sleeve; 25, through groove; 26, connecting rod; 27, sealing block; 28, measuring plate. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application is further described in detail below in combination with the figures and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0020] The implementation of the present application is described in detail below in combination with specific embodiments.

[0021] The same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components; in the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present patent, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0022] Referring to Figures 1-12 , the preferred embodiment provided by the present application is shown.

[0023] Embodiment 1: A double-end linkage type diameter-length synchronous measurement device for interventional surgery, as shown in Figure 1 , comprising a catheter 2, a hydraulic drive mechanism and a measurement block 1, the catheter 2 is a soft flexible tube, one end of which is connected with the hydraulic drive mechanism, and the other end is fixedly connected with the measurement block 1.

[0024] Specifically, the hydraulic drive mechanism is composed of Figure 2 , mainly composed of a hydraulic cylinder 3, a piston 6 and a pull rod 4. The liquid outlet end of the hydraulic cylinder 3 is communicated with the inner cavity of the catheter 2 through a fluid pipeline, the piston 6 is slidably assembled in the hydraulic cylinder 3 in a sealed manner, and the pull rod 4 is connected with the piston 6 at one end. The hydraulic cylinder 3, the catheter 2 and the internal communication pipeline thereof jointly constitute a closed hydraulic circuit, which is filled with liquid medium, and the liquid medium is preferably sterile physiological saline or special hydraulic oil with good biocompatibility.

[0025] As shown in Figure 3 , the measurement block 1 is provided with a central cavity 9 and four radial cavities 9 which are in communication with the central cavity 9 and are uniformly distributed in the circumferential direction. Four extension measurement devices are respectively and sealingly and slidably installed in the four radial cavities 9. The hydraulic drive mechanism is integrated in the cavity 9 structure, which is also filled with liquid and is in communication with the liquid in the catheter 2, and together constitutes a complete hydraulic drive system.

[0026] Each extension measurement device is mainly composed of an extension arm 8 and an extension plate 7. The extension arm 8 is in dynamic sealing cooperation with the radial cavity 9, and one end of the extension arm 8 extends to the outside of the measurement block 1 and is fixedly connected with the extension plate 7. In the initial retracted state, the outer surface of the extension plate 7 is flush with the outer peripheral surface of the measurement block 1, so as to ensure that the device has good passability. The sliding seal of each extension arm 8 in the cavity 9 ensures the sealing of the cavity, so that the entire hydraulic system remains closed.

[0027] To realize the multi-directional synchronous detection and data of irregular lumen shape, high-precision pressure sensors (not marked in the figure) are embedded on the outer walls of the four extension plates 7. In addition, the pull rod 4 can be replaced by a linear drive element such as an electric telescopic rod to realize automatic control. The measurement principle is as follows: when the pull rod 4 or the electric telescopic rod pushes the piston 6, the pressure in the hydraulic system rises, driving the four extension measuring devices to expand outward synchronously. When the first pair of symmetrically distributed extension plates 7 first contact the inner wall of the lumen, the pressure sensor on them generates a signal and transmits it to the controller (not marked in the figure). The controller records the displacement of the piston 6 at this time, which can calculate the lumen radius in that direction. As the pressure continues to be applied, the remaining direction extension plates 7 will in turn contact the inner wall of the lumen, and the controller will receive feedback signals from each pressure sensor and record the total movement distance difference of the piston 6 synchronously, thereby obtaining radius data in all directions. Based on this multi-directional inner diameter data, the controller can establish the actual cross-sectional shape of the lumen, providing key morphological basis for subsequent interventional instrument selection and surgical plan optimization.

[0028] It should be noted that the number of extension measuring devices can be adjusted according to specific application scenarios, but the number should be even and symmetrically distributed to ensure measurement balance and accuracy. At the same time, the element driving the movement of the piston 6 is not limited to the manual pull rod 4 or the electric telescopic rod. Any component that can provide linear drive function falls within the protection scope of this patent application.

[0029] The method for calculating the lumen inner diameter of the present embodiment is as follows: I. First contact and first group diameter calculation: The piston is driven by the electric telescopic rod, which simultaneously drives all extension plates to expand outward synchronously through hydraulic transmission. When a pair of symmetrically distributed extension plates first contact the inner wall of the lumen, the pressure sensor on them generates a sudden electrical signal and sends it to the controller. The controller immediately locks the extension amount of the electric telescopic rod, which is the displacement of the piston . The lumen radius in that direction is the sum of the inherent radius of the measuring block and the extension arm extension amount.

[0030] The calculation formula is: ; Wherein, is the displacement of the piston before the first contact, is the cross-sectional area of the hydraulic cylinder, is the number of extension arms moved before the first contact, is the cross-sectional area of the radial cavity.

[0031] Since the cross-sectional area of the hydraulic cylinder , the number of extension arms and the cross-sectional area of the radial cavity are all known, so the corresponding lumen diameter at this time can be calculated by the formula.

[0032] II. Subsequent contact and remaining diameter calculation The piston continues to advance, and since the first-contacted expansion plate is blocked by the lumen wall, its corresponding expansion arm stops moving, and the pressure in the hydraulic system is redistributed, driving the remaining un-contacted expansion plates to continue to expand outward.

[0033] When another pair (or one) of expansion plates contacts the lumen wall, its pressure sensor triggers, and the controller locks and records the total displacement of the piston at this moment again.

[0034] At this time, the extension amount of the expansion arm in this direction should be calculated using the total displacement of the piston minus the displacement amount when the first contact occurs . Therefore, the lumen radius in this direction is: ; where, is the number of expansion plates moved from the first contact to the second contact.

[0035] III. Iterative calculation until all measurements are completed The above process is iterated: for the direction of the th contact, the controller records the total displacement of the piston , and the lumen radius in this direction is: ; The controller converts all the calculated radius data in all directions to diameter data , , , stores them, and can directly output a numerical list or further use these data to fit and reconstruct the cross-sectional shape of the lumen. By identifying the minimum value among all diameters, the system can automatically identify the most narrow part of the lumen and its orientation.

[0036] When it is necessary to measure the length of a lesion region in the lumen, first, the measurement block 1 is guided to the distal end of the lesion segment, and by slowly pulling the catheter 2 and the measurement block 1 outward, the measurement block 1 is moved to the proximal end of the lesion segment, and after confirming the position; by directly reading the movement stroke of the measurement block, the displacement amount of the measurement block 1 from the distal end to the proximal end of the lesion is accurately obtained, which is the length of the lesion segment. This method is simple and intuitive, can be cooperated with diameter measurement to complete, and realizes comprehensive evaluation of the lesion morphology of the lumen.

[0037] Example 2: A double-end linkage type diameter-length synchronous measurement device for interventional surgery, as shown inFigure 4 and Figure 5 As shown in the figure, the embodiment provides a new hydraulic transmission mechanism compared with embodiment 1, which is mainly composed of a wedge block 10 and a reset unit, wherein the top surface of the wedge block 10 has a larger cross-sectional area than the bottom surface, and the top surface is in sealed sliding contact with the inner side wall of the measuring block 1. The wedge block 10 can slide along the length direction of the measuring block 1, and the top chamber is a sealed structure and connected with the catheter 2. The wedge block 10 is pushed to slide along the measuring block 1 by hydraulic transmission, so as to realize transmission control.

[0038] In the initial contraction state, the side wall of the wedge block 10 is in contact with the end of the stretching arm 8. In order to realize the automatic reset of the stretching arm 8 after the measurement is completed, the embodiment adopts a spring 11 as the reset unit, and the spring 11 is sleeved outside the stretching arm 8. One end of the spring 11 is fixed to the inner side wall of the measuring block 1, and the other end is connected with the side wall of the stretching arm 8. In the initial state, the spring 11 is in the natural length.

[0039] Working principle: during the measurement, the wedge block 10 is pushed to slide along the length direction of the measuring block 1 by the hydraulic transmission driven by the piston 6, the side of the wedge block 10 extrudes the stretching arm 8, and drives the stretching arm 8 and the stretching plate 7 to expand outward. When the stretching plate 7 is in contact with the inner wall of the lumen, the system can calculate the inner diameter size of the lumen according to this.

[0040] The calculation formula of the structure lumen inner diameter of the embodiment is as follows: ; Among them, is the inner diameter of the lumen in the narrow direction, is the inherent radius of the measuring block, is the total displacement amount of the piston, is the cross-sectional area of the hydraulic cylinder, is the horizontal cross-sectional area of the internal space of the measuring block, is the included angle between the inclined surface of the wedge block 10 and the horizontal surface.

[0041] Since the horizontal cross-sectional area of the internal space of the measuring block is constant, and the included angle between the inclined surface of the wedge block 10 and the horizontal surface is fixed, when the total displacement amount of the piston is determined, the lumen inner diameter size can be directly obtained.

[0042] Embodiment 3: a double-end linkage type diameter-length synchronous measurement device for interventional surgery, as shown in the figure, Figure 6As shown, this embodiment provides a new reset unit compared to embodiment 2, aiming to simplify the internal structure of the measuring block 1. The reset unit used in this embodiment is a groove 12 structure, which is formed on the side wall of the wedge block 10. The end of the extension arm 8 is disposed inside the groove 12, and its end cross-sectional dimension is larger than that of the arm body cross-section, thereby ensuring that the end of the extension arm 8 always moves along the groove 12 without dislodging under the limiting action of the groove 12. When the wedge block 10 moves along the length direction of the measuring block 1, the extension arm 8 achieves contraction or extension under the guidance and restriction of the groove 12.

[0043] The measurement principle and inner diameter calculation method in this embodiment are the same as those in Embodiment 2, and will not be repeated here.

[0044] Example 4: A dual-end linkage diameter-length synchronous measurement device for interventional surgery, such as... Figures 7-9 As shown, this embodiment provides a new hydraulic transmission mechanism compared to embodiment 3. This hydraulic transmission mechanism mainly consists of a support plate 17, a rotating plate 13, a rotating rod 15, a sleeve 21, and a limiting block 18. The support plate 17 is fixedly installed inside the measuring block 1, and the extension arm 8 slides through the support plate 17, with a limiting post 14 at its top. The rotating plate 13 is rotatably connected to the top of the support plate 17, and has arc-shaped grooves 16 on its surface, matching the number of extension measuring devices. The limiting posts 14 of the extension arm 8 are slidably embedded in the corresponding arc-shaped grooves 16. The top axis of the rotating plate 13 is fixedly connected to the rotating rod 15, and the sleeve 21 is fitted over the rotating rod 15. A spiral groove 20 is machined on the side wall of the rotating rod 15, and the limiting block 18 is fixedly installed on the inner side wall of the sleeve 21 and slidably fitted within the spiral groove 20. The sleeve 21 can slide axially in a sealed manner, forming a sealed chamber between its top and the guide tube 2. When the sleeve 21 is pushed to move linearly under hydraulic pressure, the linear motion of the sleeve 21 can be converted into the rotational motion of the rotating rod 15 through the cooperation of the limiting block 18 and the spiral groove 20, thereby driving the rotating plate 13 to rotate, and finally controlling the extension and retraction of the extension arm 8 through the cooperation of the arc groove 16 and the limiting post 14.

[0045] Working principle: During measurement, the hydraulic transmission driven by piston 6 pushes sleeve 21 downward along the axial direction, and limit block 18 moves downward synchronously with sleeve 21. Guided by spiral groove 20, the downward movement of limit block 18 is converted into the rotational movement of rotating rod 15, which drives rotating plate 13 to rotate. The arc groove 16 on rotating plate 13 then acts to push extension arm 8 to extend radially outward. When extension plate 7 contacts the inner wall of the cavity, the inner diameter of the cavity can be calculated based on the motion transmission relationship.

[0046] In this embodiment, the pitch of the helical groove 20 and the curvature of the arc-shaped groove 16 are both fixed designs, so that the extension arm 8 extends a fixed distance corresponding to each unit distance of movement of the piston 6. The corresponding relationship between the extension distance of the extension arm 8 and the displacement of the piston 6 can be obtained by experimental calibration in the specific research and development process.

[0047] It should also be noted that the technical solutions provided in Embodiments 1 to 4 are particularly suitable for clinical measurement scenarios of medium or large lumens in the human body, such as interventional surgery of bronchial, digestive tract, urethra, and other parts. The device can achieve stable and accurate diameter synchronous measurement in such lumens with sufficient operating space.

[0048] Embodiment 5: A double-end linked diameter-length synchronous measurement device for interventional surgery, as shown in Figure 10 and Figure 11 The present embodiment provides a new hydraulic transmission mechanism and an extension measurement device compared with Embodiments 1-4, aiming to further improve the passability and adaptability of the device in narrow lumens. In this embodiment, the measurement block 1 and the catheter 2 have the same diameter, and they can be an integrally formed structure. The hydraulic transmission mechanism mainly consists of a sealing block 27, a connecting rod 26, a sliding sleeve 24, and four sets of transmission rods 23. The sealing block 27 is sealingly arranged inside the measurement block 1, and a sealed chamber is formed between the top surface of the sealing block 27 and the catheter 2. The bottom surface of the sealing block 27 is fixedly connected with the connecting rod 26. The sliding sleeve 24 is slidingly sleeved on the outside of the measurement block 1, and four through grooves 25 are formed in the circumferential wall of the measurement block 1. The inner side of the sliding sleeve 24 is fixedly connected with the connecting rod 26 through a rod body passing through the through grooves 25. One end of each of the four sets of transmission rods 23 is hingedly connected with the outer wall of the sliding sleeve 24, and the other end is hingedly connected with the corresponding extension measurement device.

[0049] The extension measurement device of the present embodiment consists of four measurement rods 22 and four measurement plates 28, and the number of each set of transmission rods 23 is two. As shown in Figure 10 One end of the measurement rod 22 is hingedly connected to the outer wall of the catheter 2, and the middle part is hingedly connected with one of the transmission rods 23. The inner side wall of the measurement plate 28 is hingedly connected with the end of the other transmission rod 23. In this way, the two transmission rods 23 and their connecting parts form a parallelogram structure. This structure ensures that the measurement plate 28 can always remain vertical when the measurement rod 22 rotates to expand or retract the entire device, so that it can accurately and precisely contact the lumen wall in a surface contact manner, and finally accurately identify the narrow surface and its orientation of the lumen.

[0050] The hydraulic drive mechanism of the present embodiment is the same as that of embodiments 1-4, which will not be repeated here. Working principle: when measuring, the movement of the piston 6 drives the hydraulic transmission, pulling the sealing block 27 and the connecting rod 26 as a whole to move axially along the measuring block 1, thereby driving the sliding sleeve 24 to move synchronously. During the upward movement of the sliding sleeve 24, the transmission rod 23 transmits the force to drive each measuring rod 22 and the measuring plate 28 to expand outward around the hinge point with the catheter 2. When the measuring plate 28 is in contact with the inner wall of the lumen, the measurement of the inner diameter of the lumen in this direction is completed.

[0051] The calculation formula of the structure lumen inner diameter of the present embodiment is as follows: ; Among them, is the diameter of the measuring block, is the total displacement of the piston, is the cross-sectional area of the hydraulic cylinder, is the horizontal cross-sectional area of the measuring block internal space, is the angle between the transmission rod and the measuring block. Since the length of the transmission rod is fixed, the displacement of the sliding sleeve is the same as that of the sealing block, and the angle between the transmission rod and the measuring block can be calculated by the trigonometric function .

[0052] Embodiment 6: A double-end linkage type diameter-length synchronous measurement device for interventional surgery, as shown in Figure 12 , the present embodiment provides a new hydraulic transmission mechanism and stretching measurement device compared with embodiment 5. In the present embodiment, the stretching measurement device is composed of two measuring scales 19. The two measuring scales 19 are installed at the bottom of the measuring block 1 through a torsion spring hinge structure. In the initial state, the measuring scale 19 is in a vertical and folded posture. The hydraulic transmission mechanism includes a sealing block 27 and a pull rope 5 assembly. The sealing block 27 is slidably arranged in the measuring block 1. The pull rope 5 assembly is composed of two parts: the two ends of the first part are wound and fixed on the rotating shafts of the two measuring scales 19; the second part connecting rope connects the middle part of the first part of the pull rope 5 with the sealing block 27.

[0053] Working principle: when measuring, pull the pull rod 4 upward to drive the sealing block 27 to move axially upward along the measuring block 1, and through the pull rope 5 assembly to drive the rotating shafts of the two measuring scales 19 to rotate synchronously, overcoming the torsion torque of the torsion spring to make the measuring scale 19 expand outward. When the outer side of the measuring scale 19 is in contact with the inner wall of the lumen, the detection of the inner diameter of the lumen in this direction is completed.

[0054] In this embodiment, there is a certain transmission relationship between the moving distance of the sealing block 27 and the rotation angle of the measuring scale 19 and the diameter of the rotation shaft of the measuring scale 19. The corresponding relationship between the rotation angle of the measuring scale 19 and the displacement of the piston 6 can be obtained by calibration test in the research and development stage. Since the physical length of the measuring scale 19 is fixed, after the rotation angle is obtained, the radial displacement between the end of the measuring scale 19 and the hinge point can be accurately calculated through the trigonometric function relationship, and then the inner diameter value in this direction is obtained. The structure realizes reliable measurement of the inner diameter of the narrow lumen through simple rope 5-rotation shaft transmission.

[0055] The measuring devices described in Embodiments 5 and 6 are mainly suitable for the intervention operation scene of the narrow and complex lumen in the human body. For example, in the cardiovascular intervention field, it can be used for the lumen shape evaluation of peripheral blood vessels such as coronary artery, cerebral blood vessel and renal artery; in the respiratory intervention field, it is suitable for the narrow diagnosis of small bronchus; in addition, in the hepatobiliary surgery, urology surgery and other operation modes, it can also be used for the diameter and shape measurement of the slender lumen such as intrahepatic bile duct, pancreatic duct and ureter.

[0056] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A dual-end linkage diameter-length synchronous measurement device for interventional surgery, characterized in that, It includes a conduit (2), with a hydraulic drive mechanism and a measuring block (1) connected to both ends of the conduit (2). The measuring block (1) is equipped with a hydraulic transmission mechanism and multiple extension measuring devices. The power input end of the hydraulic transmission mechanism is connected to the conduit (2) to transmit the power of the hydraulic drive mechanism to the extension measuring device, so that the extension measuring device extends outward to measure the inner diameter of the tubular structure inside the body.

2. The dual-end linkage diameter-length synchronous measurement device for interventional surgery according to claim 1, characterized in that, The hydraulic drive mechanism includes a hydraulic cylinder (3), a piston (6) and a pull rod (4); the end of the hydraulic cylinder (3) is connected to the conduit (2), the piston (6) is sealed and slidably disposed inside the hydraulic cylinder (3), and the end of the pull rod (4) is fixedly connected to the piston (6).

3. The dual-end linkage diameter-length synchronous measurement device for interventional surgery according to claim 1 or 2, characterized in that, The extension measuring device includes an extension plate (7) and an extension arm (8). When not measuring, the extension plate (7) is embedded in the side wall of the measuring block (1) and is flush with the side wall of the measuring block (1). The end of the extension arm (8) is fixedly connected to the extension plate (7) and is slidably disposed in the hydraulic transmission mechanism. Under the action of hydraulic pressure, the hydraulic transmission mechanism drives the extension plate (7) and the extension arm (8) to extend radially along the measuring block.

4. The dual-end linkage diameter-length synchronous measurement device for interventional surgery according to claim 3, characterized in that, The hydraulic transmission mechanism is a sealed cavity (9), and the extension arms (8) of multiple extension measuring devices are all in sealed sliding contact with the inner wall of the cavity (9); at the same time, the cavity (9) is connected to the conduit (2); pressure sensors are embedded in the side walls of the extension plates (7) of multiple extension measuring devices.

5. The dual-end linkage diameter-length synchronous measurement device for interventional surgery according to claim 3, characterized in that, The hydraulic transmission mechanism includes a wedge block (10) and a reset unit; the wedge block (10) is slidably disposed on the inner side wall of the measuring block (1), and a sealed chamber is formed between the top surface of the wedge block (10) and the measuring block (1), and the sealed chamber is connected to the conduit (2); the side wall of the wedge block (10) is connected to the end of the extension arm (8), and the reset unit is disposed between the wedge block (10) and the extension arm (8), and the reset unit can return the extension measuring device to the initial position.

6. The dual-end linkage diameter-length synchronous measurement device for interventional surgery according to claim 5, characterized in that, The reset unit consists of multiple grooves (12) of the same number as the extension measuring device; the grooves (12) are opened on the inclined surface of the wedge block (10), and the end of the extension arm (8) is slidably disposed in the groove (12) and is limited by the groove (12).

7. The dual-end linkage diameter-length synchronous measurement device for interventional surgery according to claim 5, characterized in that, The reset unit consists of multiple springs (11) of the same number as the extension measuring device. The springs (11) are sleeved on the extension arm (8). One end of the spring (11) is fixedly connected to the inner wall of the measuring block (1), and the other end is fixedly connected to the side wall of the extension arm (8).

8. The dual-end linkage diameter-length synchronous measurement device for interventional surgery according to claim 3, characterized in that, The hydraulic transmission mechanism includes a support plate (17), a rotating plate (13), a rotating rod (15), a sleeve (21), and a limiting block (18); the extension arm (8) is slidably mounted on the support plate (17), the top of the support plate (17) is rotatably connected to the bottom of the rotating plate (13), the top axis of the rotating plate (13) is fixedly connected to the rotating rod (15), and the sleeve (21) is sleeved on the rotating rod (15); the side wall of the rotating rod (15) has a spiral groove (20), and the limiting block (18) is fixedly installed on the inner side wall of the sleeve (21) and slidably mounted in the spiral groove (20); the sleeve (21) slides in a sealed manner, and a sealed chamber is formed between its top and the guide tube (2); The rotating plate (13) has the same number of arc-shaped grooves (16) as the extension measuring device, and the top protrusion of the extension arm (8) is slidably set in the arc-shaped groove (16).

9. The dual-end linkage diameter-length synchronous measurement device for interventional surgery according to claim 1 or 2, characterized in that, The extension measuring device includes multiple measuring rods (22) and multiple measuring plates (28); one end of the measuring rod (22) is hinged to the side wall of the conduit (2), and the other end is hinged to the end of the measuring plate (28).

10. The dual-end linkage diameter-length synchronous measurement device for interventional surgery according to claim 9, characterized in that, The hydraulic transmission mechanism includes a sealing block (27), a connecting rod (26), a sliding sleeve (24), and multiple sets of transmission rods (23). The sealing block (27) is slidably disposed inside the conduit (2), the end of the connecting rod (26) is connected to the sealing block (27), the sliding sleeve (24) is slidably sleeved on the outer wall of the conduit (2), and the inner wall of the sliding sleeve (24) is fixedly connected to the connecting rod (26). One end of multiple sets of transmission rods (23) is rotatably connected to the outer wall of the sliding sleeve (24). Each set of transmission rods (23) consists of two rods, and the ends of the two transmission rods (23) away from the sliding sleeve (24) are rotatably connected to the corresponding measuring rod (22) and measuring plate (28), respectively.

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