A method of measuring parameters of a catheter in a bent caliper shape

Abstract

The application discloses a kind of bent card ruler shape's catheter parameter measurement method, belongs to YBC coordinate design measurement and catheter numerical control bending forming technical field, solve the problem of long trial-and-error period, complex process in prior art catheter measurement, existing YBC ruler structure is complex, cost is higher.The method includes measuring the angle between the first ruler and the second ruler to obtain C1;Measure the angle between the third ruler and the fourth ruler to obtain C2;Measure the angle of the circular arc formed by the fixed arc ruler and the sliding arc ruler to obtain B;Measure the vertical distance from the intersection of the first straight pipe section and the first straight ruler and the second straight ruler to the first straight pipe section to calculate Y1, measure the vertical distance between the intersection of the first straight ruler and the second straight ruler and the intersection of the third straight ruler and the fourth straight ruler to calculate Y2, measure the vertical distance between the intersection of the third straight ruler and the fourth straight ruler and the third straight pipe section to calculate Y3.The application can be used for YBC parameter measurement of curved catheter.

Description

Technical Field

[0001] This invention belongs to the field of YBC coordinate design and measurement and CNC bending forming technology of catheters, and particularly relates to a method for measuring the parameters of a caliper-shaped catheter. Background Technology

[0002] Currently, the typical catheter manufacturing process includes complex processes such as bending manufacturing, final assembly, catheter sampling and adjustment, and re-bending and re-adjustment, which require a large amount of trial and error time, waiting, coordination and repeated iteration.

[0003] The use of trial assembly fixtures is a common method for controlling the processing quality of parts. However, trial assembly fixtures do not include dimensional inspection and data feedback functions for conduit products, and their production cycle is long and the cost is high. In aerospace products, the precision requirements for conduits are extremely strict. The bending angle, the length of the straight section, and the angle of the pipe rotation surface affect the requirements for the positions of the two pipe ends, the clearance between the intermediate fixed position and the cabin wall, and so on. Summary of the Invention

[0004] Based on the above analysis, the present invention aims to provide a method for measuring catheter parameters using a curved caliper, which solves the problems of long trial-and-error cycles and complex procedures in existing catheter measurement technologies.

[0005] The objective of this invention is mainly achieved through the following technical solutions:

[0006] This invention provides a method for measuring the YBC parameters of a curved caliper-shaped catheter, wherein the curved catheter comprises a first straight section, a first curved section, a second straight section, a second curved section, and a third straight section connected in sequence; the catheter parameter measurement method includes the following steps:

[0007] Step 1: Provide a curved conduit and a conduit measuring ruler. In the conduit measuring ruler, one end of the fixed arc ruler is slidably connected to one end of the sliding arc ruler and their relative positions can be fixed, forming an arc shape. The other end of the fixed arc ruler is fixedly connected to a third straight ruler, and the other end of the sliding arc ruler is fixedly connected to a second straight ruler.

[0008] Step 2: Perform preliminary positioning of the first ruler and the first straight pipe section, perform preliminary positioning of the second ruler and the second straight pipe section, perform preliminary positioning of the third ruler and the second straight pipe section, and perform preliminary positioning of the fourth ruler and the third straight pipe section.

[0009] Step 3: Adjust the fit gap between the first ruler and the first straight pipe section so that the first ruler is arranged along the axial direction of the first straight pipe section and is located in the same plane; adjust the fit gap between the second ruler and the second straight pipe section so that the second ruler is arranged along the axial direction of the second straight pipe section and is located in the same plane; adjust the fit gap between the third ruler and the second straight pipe section so that the third ruler is arranged along the axial direction of the second straight pipe section and is located in the same plane; adjust the fit gap between the fourth ruler and the third straight pipe section so that the fourth ruler is arranged along the axial direction of the third straight pipe section and is located in the same plane.

[0010] Step 4: Measure the angle between the first ruler and the second ruler to obtain the bending angle between the first and second straight pipe sections; measure the angle between the third ruler and the fourth ruler to obtain the bending angle between the second and third straight pipe sections.

[0011] Measure the angle of the arc formed by the fixed arc ruler and the sliding arc ruler to obtain the angle between the plane formed by the first and second rulers and the plane formed by the third and fourth rulers;

[0012] Measure the perpendicular distance between the end of the first straight pipe segment furthest from the first bend and the intersection of the first and second rulers, and calculate the length of the first straight pipe segment. Measure the perpendicular distance between the intersection of the first and second rulers and the intersection of the third and fourth rulers, and calculate the length of the second straight pipe segment. Measure the perpendicular distance between the intersection of the third and fourth rulers and the end of the third straight pipe segment furthest from the second bend, and calculate the length of the third straight pipe segment.

[0013] Furthermore, the length of the first straight pipe section is calculated using the following formula:

[0014] Y1 = L1 - ΔL1;

[0015] ΔL1=R1tan(0.5C1);

[0016] Y1 is the length of the first straight pipe section, mm; L1 is the perpendicular distance between the end of the first straight pipe section away from the first bend and the intersection of the first straight ruler and the second straight ruler, mm; R1 is the outer arc radius of the first bend, mm; C1 is the arc angle of the outer arc of the first bend, °.

[0017] Furthermore, the length of the second straight pipe section is calculated using the following formula:

[0018] Y2=L2-ΔL1-ΔL2

[0019] ΔL1=R1tan(0.5C1);

[0020] ΔL2=R2tan(0.5C2);

[0021] Y2 is the length of the second straight pipe section, mm; L2 is the perpendicular distance between the intersection of the first and second rulers and the intersection of the third and fourth rulers, mm; R1 is the outer radius of the first bend, mm; C1 is the arc angle of the outer arc of the first bend, °; R2 is the outer radius of the second bend, mm; C2 is the arc angle of the outer arc of the second bend, °.

[0022] Furthermore, R1 = R2.

[0023] Furthermore, the length of the third straight pipe section is calculated using the following formula:

[0024] Y3 = L3 - ΔL2;

[0025] ΔL2=R2tan(0.5C2)

[0026] Y2 is the length of the third straight pipe section, mm; L2 is the perpendicular distance between the intersection of the third and fourth rulers and the end of the third straight pipe section furthest from the second bend, mm; R2 is the outer radius of the second bend, mm; C2 is the arc angle of the outer arc of the second bend, °.

[0027] Furthermore, a ruler is used to measure the vertical distance between the end of the first straight pipe segment away from the first bend pipe segment and the intersection of the first and second rulers, the vertical distance between the intersection of the first and second rulers and the intersection of the third and fourth rulers, and / or the vertical distance between the intersection of the third and fourth rulers and the end of the third straight pipe segment away from the second bend pipe segment.

[0028] Furthermore, the first, second, third, and fourth rulers are equipped with graduation lines for directly measuring the vertical distance between the end of the first straight pipe segment away from the first bend pipe segment and the intersection of the first and second rulers, the vertical distance between the intersection of the first and second rulers and the intersection of the third and fourth rulers, and / or the vertical distance between the intersection of the third and fourth rulers and the end of the third straight pipe segment away from the second bend pipe segment.

[0029] Furthermore, an angle ruler or electronic angle measuring instrument is used to measure the angle between the first and second rulers and / or the angle between the third and fourth rulers.

[0030] Furthermore, an angle ruler or electronic angle measuring instrument is used to measure the angle of the arc formed by the fixed arc ruler and the sliding arc ruler.

[0031] Furthermore, scale lines or angle vernier dimension lines are set on the sliding arc ruler and / or the fixed arc ruler for directly measuring the angle of the arc shape ultimately formed by the fixed arc ruler and the sliding arc ruler.

[0032] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0033] The method for measuring the parameters of a curved caliper-shaped conduit provided by this invention can replace the current bending manufacturing inspection method. Under limited site and conditions, such as when three-dimensional measurement and scanning technology is not available, it can accurately measure the YBC parameter. It can reduce the difficulty and workload of bending manufacturing, measurement, feedback, and revision procedures, reduce repeated sampling work caused by subjective judgment, greatly accelerate the optimization of conduit routing and production speed, and help ensure production progress. It has the characteristics of simple operation, easy implementation, low cost, convenient and fast use, and accurate measurement.

[0034] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0035] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0036] Figure 1 This is a schematic diagram of the structure of the adapter measuring ruler in the caliper-shaped catheter parameter measurement method provided in Embodiment 1 of the present invention;

[0037] Figure 2a This is a schematic diagram of the structure of the second ruler in the caliper-shaped catheter parameter measurement method provided in Embodiment 1 of the present invention;

[0038] Figure 2b This is a schematic diagram of the assembly of the first ruler and the second ruler in the method for measuring the parameters of a curved caliper-shaped conduit provided in Embodiment 1 of the present invention.

[0039] Figure 3 This is a schematic diagram of the connection structure between the sliding arc-shaped ruler and the fixed arc-shaped ruler in the caliper-shaped conduit parameter measurement method provided in Embodiment 1 of the present invention;

[0040] Figure 4 This is a schematic diagram of the actual measured length position in the caliper-shaped catheter parameter measurement method provided in Embodiment 1 of the present invention;

[0041] Figure 5 This is a schematic diagram showing the length position of the actual parameter Y in the caliper-shaped catheter parameter measurement method provided in Embodiment 1 of the present invention;

[0042] Figure 6 This is a flowchart of a method for measuring the parameters of a caliper-shaped catheter provided in Embodiment 1 of the present invention.

[0043] Figure label:

[0044] 1-First ruler; 2-Second ruler; 3-Third ruler; 4-Fourth ruler; 5-Bent guide tube; 6-Fixed arc ruler; 7-Sliding arc ruler; 8-Guide block; 9-Positioning rod; 10-Pressure block; 11-Blind hole; 12-Through hole; 13-First fixing piece; 14-First fixing screw; 15-First connecting plate; 16-First end fixing block; 17-First end screw; 18-Second end fixing block; 19-Second end screw; 20-Second connecting plate; 21-Third end fixing block; 22-Third end screw; 23-Fourth end fixing block; 24-Fourth end screw; 25-U-shaped clamp. Detailed Implementation

[0045] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of the present invention and, together with the embodiments of the present invention, serve to illustrate the principles of the present invention.

[0046] Example 1

[0047] This embodiment provides a method for measuring the parameters of a curved caliper-shaped catheter. (See [link to documentation]). Figure 6 The YBC parameter of the curved conduit 5 is used to measure the following steps: The curved conduit 5 includes a first straight pipe section, a first bent pipe section, a second straight pipe section, a second bent pipe section, and a third straight pipe section connected in sequence.

[0048] Step 1: Provide a curved conduit 5;

[0049] Step 2: Perform preliminary positioning of the first ruler 1 and the first straight pipe section, perform preliminary positioning of the second ruler 2 and the second straight pipe section, perform preliminary positioning of the third ruler 3 and the second straight pipe section, and perform preliminary positioning of the fourth ruler 4 and the third straight pipe section.

[0050] Step 3: Adjust the fitting gap between the first ruler 1 and the first straight pipe section so that the first ruler 1 is arranged along the axial direction of the first straight pipe section and is located in the same plane.

[0051] Adjust the fitting gap between the second ruler 2 and the second straight pipe section so that the second ruler 2 is arranged along the axial direction of the second straight pipe section and is located in the same plane;

[0052] Adjust the fitting gap between the third ruler 3 and the second straight pipe section so that the third ruler 3 is arranged along the axial direction of the second straight pipe section and is located in the same plane;

[0053] Adjust the fit gap between the fourth ruler 4 and the third straight pipe section so that the fourth ruler 4 is arranged along the axial direction of the third straight pipe section and is located in the same plane.

[0054] Step 4: Measure the angle between the first ruler 1 and the second ruler 2 to obtain the bending angle (i.e., parameter C1) between the first and second straight pipe sections.

[0055] Measuring the angle between the third ruler 3 and the fourth ruler 4 allows us to obtain the bending angle (i.e., parameter C2) between the second and third straight pipe sections.

[0056] By measuring the angle of the arc formed by the fixed arc ruler 6 and the sliding arc ruler 7, the angle (i.e. parameter B) between the plane formed by the first ruler 1 and the second ruler 2 and the plane formed by the third ruler 3 and the fourth ruler 4 can be obtained.

[0057] Measure the perpendicular distance L1 between the end of the first straight pipe segment furthest from the first bend and the intersection of the first ruler 1 and the second ruler 2, and calculate the length Y1 of the first straight pipe segment. Measure the perpendicular distance L2 between the intersection of the first ruler 1 and the second ruler 2 and the intersection of the third ruler 3 and the fourth ruler 4, and calculate the length Y2 of the second straight pipe segment. Measure the perpendicular distance L3 between the intersection of the third ruler 3 and the fourth ruler 4 and the end of the third straight pipe segment furthest from the second bend, and calculate the length Y3 of the third straight pipe segment. See [reference needed] Figures 4 to 5 .

[0058] Compared with existing technologies, the caliper-shaped catheter parameter measurement method provided in this embodiment can replace the current bending manufacturing inspection method. Under limited site and conditions, such as when three-dimensional measurement and scanning technology is not available, it can accurately measure YBC parameters. It can reduce the difficulty and workload of bending manufacturing, measurement and feedback, and revision procedures, reduce repeated sampling work caused by subjective judgment, greatly accelerate the optimization of catheter routing and production speed, and help ensure production progress. It has the characteristics of simple operation, easy implementation, low cost, convenient and fast use, and accurate measurement.

[0059] Specifically, the length Y1 of the first straight pipe segment is calculated using the following formula:

[0060] Y1 = L1 - ΔL1;

[0061] ΔL1=R1tan(0.5C1);

[0062] Where Y1 is the length of the first straight pipe section, mm; L1 is the vertical distance of the first straight pipe section away from the end of the first bend pipe section and the intersection of the first straight ruler 1 and the second straight ruler 2, mm; R1 is the outer arc radius of the first bend pipe section, mm; C1 is the arc angle of the outer arc of the first bend pipe section, °.

[0063] The length Y2 of the second straight pipe section is calculated using the following formula:

[0064] Y2=L2-ΔL1-ΔL2

[0065] ΔL1=R1tan(0.5C1);

[0066] ΔL2=R2tan(0.5C2);

[0067] Where Y2 is the length of the second straight pipe section, mm; L2 is the perpendicular distance between the intersection of the first ruler 1 and the second ruler 2 and the intersection of the third ruler 3 and the fourth ruler 4, mm; R1 is the outer arc radius of the first bend pipe section, mm; C1 is the arc angle of the outer arc of the first bend pipe section, °; ​​R2 is the outer arc radius of the second bend pipe section, mm; C2 is the arc angle of the outer arc of the second bend pipe section, °.

[0068] The length Y3 of the third straight pipe section is calculated using the following formula:

[0069] Y3 = L3 - ΔL2;

[0070] ΔL2=R2tan(0.5C2)

[0071] Where Y2 is the length of the third straight pipe section, mm; L2 is the perpendicular distance between the intersection of the third straight ruler 3 and the fourth straight ruler 4 and the end of the third straight pipe section away from the second bend, mm; R2 is the outer arc radius of the second bend, mm; and C2 is the arc angle of the outer arc of the second bend, °.

[0072] It should be noted that in practical applications, R1 = R2.

[0073] On one hand, parameter Y refers to the lengths of the first, second, and third straight pipe sections, which can be measured using conventional length measuring tools, such as rulers. Alternatively, graduations can be set on the first ruler 1, the second ruler 2, the third ruler 3, and / or the fourth ruler 4 for direct measurement of the lengths of the first, second, and third straight pipe sections.

[0074] On the other hand, the actual angles of parameters C1 and C2 can be measured using a conventional angle ruler, electronic angle measuring instrument, or vernier angle measuring tool, which will not be detailed here.

[0075] On the other hand, the actual angle of parameter B can be measured using a conventional angle ruler, electronic angle measuring instrument, or vernier angle measuring tool. Alternatively, scale lines or angle vernier dimension lines can be set on the sliding arc ruler 7 and / or the fixed arc ruler 6 to directly measure the angle between the plane formed by the first ruler 1 and the second ruler 2 and the plane formed by the third ruler 3 and the fourth ruler 4.

[0076] For example, the above-mentioned method for measuring catheter parameters using a bent caliper uses an adapter measuring scale with the following structure, see [link to relevant documentation]. Figures 1 to 3It includes a first ruler 1, a second ruler 2, a third ruler 3, a fourth ruler 4, a fixed curved ruler 6, and a sliding curved ruler 7.

[0077] The first ruler 1 and the second ruler 2 are rotatably connected and their relative positions can be fixed. The first ruler 1 is set along the axial direction of the first straight pipe section and its side is in contact with the first straight pipe section. The second ruler 2 is set along the axial direction of the second straight pipe section and its side is in contact with the second straight pipe section. By measuring the angle between the first ruler 1 and the second ruler 2, the bending angle (i.e., parameter C1) of the first straight pipe section and the second straight pipe section can be obtained.

[0078] The third ruler 3 and the fourth ruler 4 are rotatably connected and their relative positions can be fixed. The third ruler 3 is set along the axial direction of the second straight pipe section and its side is in contact with the side of the second straight pipe section. The fourth ruler 4 is set along the axial direction of the third straight pipe section and its side is in contact with the side of the third straight pipe section. By measuring the angle between the third ruler 3 and the fourth ruler 4, the bending angle (i.e., parameter C2) of the second and third straight pipe sections can be obtained.

[0079] One end of the fixed arc-shaped ruler 6 is slidably connected to one end of the sliding arc-shaped ruler 7, and their relative positions can be fixed, forming an arc. The other end of the fixed arc-shaped ruler 6 is fixedly connected to the third straight ruler 3, and the other end of the sliding arc-shaped ruler 7 is fixedly connected to the second straight ruler 2. By the angle of the arc formed by the fixed arc-shaped ruler 6 and the sliding arc-shaped ruler 7, the angle (i.e., parameter B) between the plane formed by the first straight ruler 1 and the second straight ruler 2 and the plane formed by the third straight ruler 3 and the fourth straight ruler 4 can be obtained.

[0080] For the connection between the fixed arc ruler 6 and the sliding arc ruler 7, for example, the body of the fixed arc ruler 6 is made of a sheet metal bent into an arc shape, and the body of the sliding arc ruler 7 is also made of a sheet metal bent into an arc shape. The fixed arc ruler 6 has an annular guide groove in the circumferential direction. The radial cross-sectional shape of the annular guide groove is rectangular. The groove depth of the annular guide groove is equal to the thickness of the sliding arc ruler 7. The sliding arc ruler 7 is inserted into the annular guide groove. The two are assembled and fit together without wobbling from side to side and can slide freely.

[0081] To improve measurement accuracy and prevent relative sliding between the sliding arc-shaped ruler 7 and the fixed arc-shaped ruler 6 during measurement, the aforementioned adapter measuring ruler also includes a guide block 8 and a positioning rod 9. The guide block 8 is located at the opening of the annular guide groove and is fixedly connected to the fixed arc-shaped ruler 6. The positioning rod 9 passes through the guide block 8 and abuts against the sliding arc-shaped ruler 7, thereby positioning the sliding arc-shaped ruler 7 and the fixed arc-shaped ruler 6 during measurement and preventing sliding. And / or, the aforementioned adapter measuring ruler also includes a pressure block 10, which is located at the opening of the annular guide groove and is fixedly connected to the fixed arc-shaped ruler 6. The pressure block 10 abuts against the sliding arc-shaped ruler 7.

[0082] Specifically, the structures of the first ruler 1, the second ruler 2, the third ruler 3, and the fourth ruler 4 are basically the same, including a ruler body with blind holes and through holes 12 at the bottom of the blind holes, thus forming a stepped inner wall on the ruler body. The two ends of the ruler body are semicircular, with a radius of half the width of the ruler body. The shapes of the two ends of the blind holes and the two ends of the through holes 12 can be either semicircular or square.

[0083] It should be noted that, in practical applications, the blind hole on the first ruler 1 and the blind hole 11 on the second ruler 2 can face the same side, or they can be set opposite each other or back to back. Similarly, the blind hole on the third ruler 3 and the blind hole on the fourth ruler 4 can face the same side, or they can be set opposite each other or back to back.

[0084] In order to connect the first ruler 1 and the second ruler 2, the above-mentioned adapter measuring ruler also includes a first fixing member 13 and a first fixing screw 14 and a first fixing nut that cooperate with each other. The first fixing screw passes through the first fixing member 13, the first ruler 1 and the second ruler 2 and is detachably fixed to the first fixing nut. In order to reduce the shaking between the first ruler 1 and the second ruler 2, the first fixing member 13 is located in the blind hole of the first ruler 1 and / or the first fixing member 13 is located in the blind hole 11 of the second ruler 2. The first fixing member 13 cooperates with the blind hole of the first ruler 1 and / or the blind hole 11 of the second ruler 2 to ensure that the angle of the first ruler 1 and the second ruler 2 is stable after the first fixing screw is tightened and will not be easily deformed.

[0085] In order to enable the connection between the third ruler 3 and the fourth ruler 4, the aforementioned adapter measuring ruler also includes a second fixing member and a second fixing screw and a second fixing nut that cooperate with each other. The second fixing screw passes through the second fixing member, the third ruler 3 and the fourth ruler 4 and is detachably fixed to the second fixing nut. In order to reduce the shaking between the third ruler 3 and the fourth ruler 4, the second fixing member is located in the blind hole of the third ruler 3 and / or the second fixing member is located in the blind hole of the fourth ruler 4, and the second fixing member cooperates with the blind hole of the third ruler 3 and / or the blind hole of the fourth ruler 4.

[0086] It should be noted that there is one first fastener 13, which can be located in one of the blind holes 11 of the first ruler 1 and the blind holes 11 of the second ruler 2, or there can be two first fasteners 13, one of which is located in the blind hole of the first ruler 1 and the other in the blind hole 11 of the second ruler 2.

[0087] Similarly, the second fastener is one, which can be located in one of the blind holes of the third ruler 3 and the fourth ruler 4, or the number of the second fastener is two, one in the blind hole of the third ruler 3 and the other in the blind hole of the fourth ruler 4.

[0088] For example, both the first fastener 13 and the second fastener are thin plates. The width of the first fastener 13 is equal to the width of the blind hole on the first ruler 1 and / or the second ruler 2, and the thickness of the first fastener 13 is equal to the depth of the blind hole on the first ruler 1 and / or the second ruler 2. The width of the second fastener is equal to the width of the blind hole on the third ruler 3 and / or the fourth ruler 4, and the thickness of the second fastener is equal to the depth of the blind hole on the third ruler 3 and / or the fourth ruler 4.

[0089] In order to achieve a stable connection between the second ruler 2 and the sliding arc ruler 7, the above-mentioned adapter measuring ruler also includes a first connecting plate 15, one end of which is connected to the second ruler 2, and the other end of which is connected to the sliding arc ruler 7.

[0090] For example, one end of the first connecting ruler plate 15 is connected to the second ruler 2 through the first end fixing block 16. The first end screw 17 passes through the first connecting ruler plate 15, the second ruler 2 and the first end fixing block 16 and is fixedly connected to the first end nut, thereby realizing the connection between the first connecting ruler plate 15 and the second ruler 2, so that the second ruler 2 is in close contact with the side of the first connecting ruler plate 15.

[0091] Similarly, the other end of the first connecting plate 15 is connected to the sliding arc-shaped ruler 7 through the second end fixing block 18. The second end fixing block 18 is fixedly connected to the sliding arc-shaped ruler 7 (e.g., by welding or integral molding). The second end screw 19 passes through the first connecting plate 15 and the second end fixing block 18 and is fixedly connected to the second end nut, thereby realizing the connection between the first connecting plate 15 and the sliding arc-shaped ruler 7.

[0092] In order to achieve a stable connection between the third ruler 3 and the fixed arc ruler 6, the above-mentioned adapter measuring ruler also includes a second connecting plate 20. One end of the second connecting plate 20 is connected to the third ruler 3, and the other end of the second connecting plate 20 is connected to the fixed arc ruler 6.

[0093] For example, one end of the second connecting plate 20 is connected to the third ruler 3 through the third end fixing block 21. The third end screw 22 passes through the second connecting plate 20, the third ruler 3 and the third end fixing block 21 and is fixedly connected to the third end nut, thereby realizing the connection between the second connecting plate 20 and the third ruler 3, so that the third ruler 3 is in close contact with the side of the second connecting plate 20.

[0094] Similarly, the other end of the second connecting plate 20 is connected to the fixed arc-shaped ruler 6 through the fourth end fixing block 23. The fourth end fixing block 23 is fixedly connected to the fixed arc-shaped ruler 6 (for example, by welding or integral molding). The fourth end screw 24 passes through the second connecting plate 20 and the fourth end fixing block 23 and is fixedly connected to the fourth end nut, thereby realizing the connection between the second connecting plate 20 and the fixed arc-shaped ruler 6.

[0095] To improve the adaptability of the aforementioned adapter measuring ruler and enable the measurement of conduits of different diameters, the first connecting plate 15 has multiple first mounting holes arranged along its length for detachable connection with the second end fixing block 18, and the second connecting plate 20 has multiple second mounting holes arranged along its length for detachable connection with the fourth end fixing block 23. Thus, by changing the connection of the second end fixing block 18 to different first mounting holes and changing the connection of the fourth end fixing block 23 to different mounting holes, the lengths of the first connecting plate 15 and the second connecting plate 20 can be changed, thereby changing the distance between the second ruler 2 and the third ruler 3, adapting to the measurement of conduits of different diameters.

[0096] For example, the aforementioned adapter measuring ruler includes multiple sets of first connecting plates 15 and second connecting plates 20, for instance, including 6 sets of first connecting plates 15 and second connecting plates 20, corresponding to 6 major size series: Φ3, ​​Φ6, Φ8, Φ10, Φ12 and Φ14 respectively. The center distance between two adjacent first mounting holes and two adjacent second mounting holes is 5mm, and each series has 5 levels. Accordingly, for the Φ3 series, the adaptable catheter outer diameters are Φ3, Φ13, Φ23, Φ33, and Φ43; for the Φ6 series, the adaptable catheter outer diameters are Φ6, Φ16, Φ26, Φ36, and Φ46; for the Φ8 series, the adaptable catheter outer diameters are Φ8, Φ18, Φ28, Φ38, and Φ48; for the Φ10 series, the adaptable catheter outer diameters are Φ10, Φ20, Φ30, Φ40, and Φ50; and for the Φ14 series, the adaptable catheter outer diameters are Φ14, Φ24, Φ34, Φ44, and Φ54. Therefore, the first connecting plate 15 and the second connecting plate 20 of the above six major size series can basically cover the range of catheter outer diameters from Φ3 to Φ54.

[0097] From the perspectives of spatial layout, conduit length, and measurement interference, the structures of the second end fixing block 18 and the fourth end fixing block 23 are the same. Each of them includes a block body and a first mounting block and a second mounting block symmetrically arranged relative to the arc plane formed by the fixed arc ruler 6 and the sliding arc ruler 7. Mounting holes are opened on both the first mounting block and the second mounting block. The first mounting block of the second end fixing block 18 and the first mounting block of the fourth end fixing block 23 are located on the same side of the arc plane, and the second mounting block of the second end fixing block 18 and the second mounting block of the fourth end fixing block 23 are located on the other side of the arc plane.

[0098] In order to ensure the stability of the connection between the first connecting plate 15 and the second end fixing block 18, and the stability of the connection between the second connecting plate 20 and the fourth end fixing block 23, the second end fixing block 18 and the fourth end fixing block 23 are both arranged along the tangent direction of the arc, so that the first connecting plate 15 and the second connecting plate 20 are arranged along the radial direction of the arc, that is, the first connecting plate 15 and the second connecting plate 20 are perpendicular to the tangent of the arc.

[0099] On the one hand, considering the spatial layout and the length of the conduit, the first connecting plate 15 is connected to the first mounting block of the second end fixing block 18, and the second connecting plate 20 is connected to the first mounting block of the fourth end fixing block 23. Alternatively, the first connecting plate 15 is connected to the second mounting block of the second end fixing block 18, and the second connecting plate 20 is connected to the second mounting block of the fourth end fixing block 23. In other words, the first connecting plate 15 and the second connecting plate 20 are located on the same side. This can reduce the overall volume of the transition measuring ruler and also reduce the lateral distance between the first connecting plate 15 and the second connecting plate 20, which is suitable for cases with a small conduit length.

[0100] On the other hand, from the perspective of measurement interference, the first connecting plate 15 is connected to the first mounting block of the second end fixing block 18, and the second connecting plate 20 is connected to the second mounting block of the fourth end fixing block 23. Alternatively, the first connecting plate 15 is connected to the second mounting block of the second end fixing block 18, and the second connecting plate 20 is connected to the first mounting block of the fourth end fixing block 23. That is to say, the first connecting plate 15 and the second connecting plate 20 are located on different sides. In this way, the first connecting plate 15 and the second connecting plate 20 can coincide in the transverse plane without interference, thus making it suitable for measurement when parameter B is zero.

[0101] It is worth noting that the connection between the conduit and the first ruler 1, the second ruler 2, the third ruler 3 and / or the fourth ruler 4 is a line connection, which has poor stability. Therefore, the above-mentioned adapter measuring ruler also includes a U-shaped clamp 25. The conduit is fixedly connected to the first ruler 1 through the U-shaped clamp 25, and / or the conduit is connected to the second ruler 2 through the U-shaped clamp 25, and / or the conduit is connected to the third ruler 3 through the U-shaped clamp 25, and / or the conduit is connected to the fourth ruler 4 through the U-shaped clamp 25.

[0102] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for measuring the parameters of a curved caliper-shaped conduit, characterized in that, The YBC parameter is used to measure the curved conduit, which includes a first straight section, a first curved section, a second straight section, a second curved section, and a third straight section connected in sequence. The catheter parameter measurement method includes the following steps: Step 1: Provide a curved conduit and a conduit measuring ruler. The conduit measuring ruler includes a first straight ruler, a second straight ruler, a third straight ruler, a fourth straight ruler, a fixed arc-shaped ruler, and a sliding arc-shaped ruler. The first straight ruler and the second straight ruler are rotatably connected and their relative positions can be fixed. The first straight ruler is arranged along the axial direction of the first straight conduit segment, and its side is in contact with the first straight conduit segment. The second straight ruler is arranged along the axial direction of the second straight conduit segment, and its side is in contact with the second straight conduit segment. The bending angle between the first and second straight conduit segments is obtained by measuring the angle between the first and second straight rulers. The third and fourth straight rulers are rotatably connected and... The relative positions can be fixed. The third ruler is set along the axial direction of the second straight pipe section and the side of the third ruler is attached to the side of the second straight pipe section. The fourth ruler is set along the axial direction of the third straight pipe section and the side of the fourth ruler is attached to the side of the third straight pipe section. The bending angle between the second and third straight pipe sections is obtained by measuring the angle between the third and fourth rulers. One end of the fixed arc ruler and one end of the sliding arc ruler are slidably connected and their relative positions can be fixed. The two form an arc. The other end of the fixed arc ruler is fixedly connected to the third ruler, and the other end of the sliding arc ruler is fixedly connected to the second ruler. Step 2: Perform preliminary positioning of the first ruler and the first straight pipe section, perform preliminary positioning of the second ruler and the second straight pipe section, perform preliminary positioning of the third ruler and the second straight pipe section, and perform preliminary positioning of the fourth ruler and the third straight pipe section. Step 3: Adjust the fit gap between the first ruler and the first straight pipe section so that the first ruler is arranged along the axial direction of the first straight pipe section and is located in the same plane; adjust the fit gap between the second ruler and the second straight pipe section so that the second ruler is arranged along the axial direction of the second straight pipe section and is located in the same plane; adjust the fit gap between the third ruler and the second straight pipe section so that the third ruler is arranged along the axial direction of the second straight pipe section and is located in the same plane; adjust the fit gap between the fourth ruler and the third straight pipe section so that the fourth ruler is arranged along the axial direction of the third straight pipe section and is located in the same plane. Step 4: Measure the angle between the first ruler and the second ruler to obtain the bending angle between the first and second straight pipe sections; measure the angle between the third ruler and the fourth ruler to obtain the bending angle between the second and third straight pipe sections. Measure the angle of the arc formed by the fixed arc ruler and the sliding arc ruler to obtain the angle between the plane formed by the first and second rulers and the plane formed by the third and fourth rulers; Measure the perpendicular distance between the end of the first straight pipe segment furthest from the first bend and the intersection of the first and second rulers, and calculate the length of the first straight pipe segment. Measure the perpendicular distance between the intersection of the first and second rulers and the intersection of the third and fourth rulers, and calculate the length of the second straight pipe segment. Measure the perpendicular distance between the intersection of the third and fourth rulers and the end of the third straight pipe segment furthest from the second bend, and calculate the length of the third straight pipe segment.

2. The method for measuring the parameters of a caliper-shaped conduit according to claim 1, characterized in that, The length of the first straight pipe segment is calculated using the following formula: Y1 = L1 - ΔL1; ΔL1 = R1tan(0.5C1); Y1 is the length of the first straight pipe section, mm; L1 is the perpendicular distance between the end of the first straight pipe section away from the first bend and the intersection of the first straight ruler and the second straight ruler, mm; R1 is the outer arc radius of the first bend, mm; C1 is the arc angle of the outer arc of the first bend, °.

3. The method for measuring the parameters of a curved caliper-shaped conduit according to claim 1, characterized in that, The length of the second straight pipe section is calculated using the following formula: Y2=L2-ΔL1-ΔL2 ΔL1 = R1tan(0.5C1); ΔL2 = R2tan(0.5C2); Y2 is the length of the second straight pipe section, mm; L2 is the perpendicular distance between the intersection of the first and second rulers and the intersection of the third and fourth rulers, mm; R1 is the outer radius of the first bend, mm; C1 is the arc angle of the outer arc of the first bend, °; R2 is the outer radius of the second bend, mm; C2 is the arc angle of the outer arc of the second bend, °.

4. The method for measuring the parameters of a caliper-shaped conduit according to claim 3, characterized in that, R1 = R2.

5. The method for measuring the parameters of a caliper-shaped conduit according to claim 1, characterized in that, The length of the third straight pipe section is calculated using the following formula: Y3 = L3 - ΔL2; ΔL2=R2tan(0.5C2) Y3 is the length of the third straight pipe section, mm; L2 is the perpendicular distance between the intersection of the third and fourth rulers and the end of the third straight pipe section furthest from the second bend, mm; R2 is the outer radius of the second bend, mm; C2 is the arc angle of the outer arc of the second bend, °.

6. The method for measuring the parameters of a curved caliper-shaped conduit according to any one of claims 1 to 5, characterized in that, Use a ruler to measure the vertical distance between the end of the first straight pipe section away from the first bend and the intersection of the first and second rulers, the vertical distance between the intersection of the first and second rulers and the intersection of the third and fourth rulers, and / or the vertical distance between the intersection of the third and fourth rulers and the end of the third straight pipe section away from the second bend.

7. The method for measuring the parameters of a curved caliper-shaped conduit according to any one of claims 1 to 5, characterized in that, The first, second, third, and fourth rulers are equipped with scale lines for directly measuring the vertical distance between the end of the first straight pipe segment away from the first bend pipe segment and the intersection of the first and second rulers, the vertical distance between the intersection of the first and second rulers and the intersection of the third and fourth rulers, and / or the vertical distance between the intersection of the third and fourth rulers and the end of the third straight pipe segment away from the second bend pipe segment.

8. The method for measuring the parameters of a curved caliper-shaped conduit according to any one of claims 1 to 5, characterized in that, Use an angle ruler or electronic angle measuring instrument to measure the angle between the first and second rulers and / or the angle between the third and fourth rulers.

9. The method for measuring the parameters of a curved caliper-shaped conduit according to any one of claims 1 to 5, characterized in that, The angle of the arc formed by the fixed arc ruler and the sliding arc ruler is measured using an angle ruler or an electronic angle measuring instrument.

10. The method for measuring the parameters of a curved caliper-shaped conduit according to any one of claims 1 to 5, characterized in that, The sliding arc ruler and / or the fixed arc ruler are provided with scale lines or angle vernier dimension lines for directly measuring the angle of the arc shape finally formed by the fixed arc ruler and the sliding arc ruler.

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