Woven artificial blood vessel inner wall impurity detection system and method

Abstract

The invention belongs to the technical field of artificial blood vessels, and particularly relates to a woven artificial blood vessel inner wall impurity detection system and method. The woven artificial blood vessel inner wall impurity detection system comprises a frame body; the blood vessel clamping device is arranged at the upper part of the frame body and is used for driving the woven artificial blood vessel to move up and down or horizontally rotate; and the impurity detection device is arranged at the lower part of the frame body. The wall thickness of the artificial blood vessel is detected through the laser reflection principle, whether thread residues are attached to the inner wall of the artificial blood vessel or not is judged according to the thickness, and it is guaranteed that the inner wall of the blood vessel is smooth and free of impurities and thread residues.

Description

Technical Field

[0001] The invention belongs to the technical field of artificial blood vessels, and in particular relates to a system and method for detecting impurities on the inner wall of a braided artificial blood vessel. Background Art

[0002] During the preparation of the artificial blood vessel tube blanks, there are cases where impurities such as thread ends and hairiness are attached to the inside of the braided artificial blood vessels. Because the inner diameter of the tubular fabric is small (10-32mm) and the length is long (20cm-60cm), it is difficult to directly observe the inner wall of the tubular fabric through sight. If it is not discovered in advance and not removed in the subsequent cleaning process, it is easy to cause blood vessel blockage and vascular embolism after the artificial blood vessel is implanted in the body, which is a great threat to human life. When hairiness and thread ends are attached to the inner wall of the artificial blood vessel, the thickness of this position is thicker than other parts. Therefore, by detecting the wall thickness of the artificial blood vessel, it can be used to determine whether impurities are attached. Summary of the invention

[0003] In order to solve the shortcomings of the prior art, the present invention provides a system and method for detecting impurities on the inner wall of a braided artificial blood vessel. The present invention detects the wall thickness of the artificial blood vessel by the principle of laser reflection, and judges whether there are thread ends attached to the inner wall of the artificial blood vessel based on the thickness, thereby ensuring that the inner wall of the blood vessel is smooth and free of impurities and thread ends, and is applicable to the detection of artificial blood vessels with an inner diameter of 15-32 mm.

[0004] The technical solution provided by the present invention is as follows:

[0005] A braided artificial blood vessel inner wall impurity detection system, comprising:

[0006] Frame;

[0007] A blood vessel clamping device disposed on the upper part of the frame is used to drive the braided artificial blood vessel to move up and down or rotate horizontally;

[0008] And an impurity detection device is arranged at the lower part of the frame.

[0009] Based on the above technical solution:

[0010] The braided artificial blood vessel can be clamped by the upper blood vessel clamping device and made to droop naturally, so as to facilitate the measurement of wall thickness;

[0011] The impurity detection device at the bottom can detect the wall thickness of the naturally drooping braided artificial blood vessel, so as to judge whether there are thread ends attached to the inner wall of the artificial blood vessel based on the thickness.

[0012] Specifically, the blood vessel clamping device comprises:

[0013] Rotating chuck;

[0014] And a driving mechanism for driving the rotating chuck to move up and down or rotate horizontally.

[0015] Based on the above technical solution, the braided artificial blood vessel can be moved up and down or rotated, so as to facilitate the detection of different areas.

[0016] Specifically, the driving mechanism includes a chassis, in which at least one linear module is vertically arranged, and a moving part of the linear module is fixedly connected to a motor, the motor is vertically arranged, and an output shaft of the motor is downwardly arranged.

[0017] Specifically, the rotary chuck includes a vertically arranged rotating drum, the upper bottom wall of the rotating drum is fixedly connected to the output shaft of the motor through a connecting rod, the rotating drum, the connecting rod and the output shaft of the motor are coaxially arranged, and a plurality of chucks are arranged around the peripheral wall of the lower part of the rotating drum.

[0018] Based on the above technical solution, the braided artificial blood vessel can be clamped and kept in a natural tubular shape.

[0019] Specifically, the clamp body includes a first clamp arm, a torsion spring and a second clamp arm. The second clamp arm is fixedly arranged in a groove opened on the outer wall of the rotating drum. The clamping mouths of the first clamp arm and the second clamp arm are arranged in corresponding arc shapes. The first clamp arm, the second clamp arm and the groove are arranged vertically.

[0020] Based on the above technical solution, the clamp body can be designed based on a commonly used clamp structure, and the braided artificial blood vessel can be in a natural round tube shape through the arc-shaped clamp mouth.

[0021] Specifically, the impurity detection device includes:

[0022] A first vertical pole is fixedly arranged below the rotating chuck, and a first laser ranging sensor is fixedly arranged on the upper part of the first vertical pole;

[0023] and a fixedly arranged second vertical pole, a second laser distance measuring sensor is fixedly arranged on the upper part of the second vertical pole, and the second vertical pole is located outside the horizontal projection area of ​​the rotating chuck;

[0024] The first laser distance measuring sensor and the second laser distance measuring sensor are arranged opposite to each other.

[0025] Based on the above technical solution:

[0026] The first vertical pole and the second vertical pole are fixedly arranged, so as to obtain a horizontal distance C between the first laser ranging sensor and the second laser ranging sensor;

[0027] The horizontal distance A between the first laser distance measuring sensor and the inner wall of the braided artificial blood vessel can be obtained;

[0028] The horizontal distance B between the second laser distance measuring sensor and the inner wall of the braided artificial blood vessel can be obtained;

[0029] By calculating CAB, the wall thickness Sx can be obtained.

[0030] Specific:

[0031] The measuring path of the first laser distance measuring sensor is along the radial direction of the drum;

[0032] The measuring path of the second laser distance measuring sensor is along the radial direction of the drum;

[0033] The projections of the measurement path of the first laser ranging sensor and the measurement path of the second laser ranging sensor on a horizontal plane are collinear.

[0034] Based on the above technical solution, and with measurement and calculation.

[0035] Furthermore, the system also includes a controller, which is electrically connected to the linear module, the motor, the first laser distance sensor and the second laser distance sensor. The controller can also be connected to a control panel and a display for operation and data display. The laser distance sensor can adopt an existing small and micro laser distance sensor, such as the ultra-small laser sensor EX-L200.

[0036] The present invention also provides a method for detecting impurities on the inner wall of a braided artificial blood vessel, which uses a system to detect impurities on the inner wall of a braided artificial blood vessel, and specifically comprises the following steps:

[0037] 1) Clamp the upper end of the braided artificial blood vessel on the rotating chuck, and let the lower end droop naturally. By moving the rotating chuck downward, the braided artificial blood vessel is covered outside the first laser ranging sensor; obtain the horizontal distance C between the first laser ranging sensor and the second laser ranging sensor; and obtain the designed wall thickness S of the braided artificial blood vessel;

[0038] 2) measuring the distance by a first laser distance measuring sensor to obtain a horizontal distance A from the inner wall of the braided artificial blood vessel; measuring the distance by a second laser distance measuring sensor to obtain a horizontal distance B from the outer wall of the braided artificial blood vessel;

[0039] 3) Calculate the wall thickness Sx, Sx = CAB;

[0040] 4) Calculate the ratio of Sx to S;

[0041] 5) When the ratio is greater than or equal to 120%, it is detected as having impurities.

[0042] Furthermore, the method further comprises step 6): moving up and down and / or rotating the braided artificial blood vessel to detect impurities in different parts.

[0043] The beneficial effects of the present invention are as follows:

[0044] 1) Test the wall thickness of artificial blood by laser principle, and judge whether there is yarn or impurity attached to this position by the measured real-time wall thickness.

[0045] 2) The rotation and up and down movement of the artificial blood vessel can more comprehensively detect the condition of the inner wall of the artificial blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a structural schematic diagram of a braided artificial blood vessel inner wall impurity detection system.

[0047] Figure 2 It is a bottom view of the rotary chuck.

[0048] Figure 3 It is a schematic diagram of a method for detecting impurities on the inner wall of a braided artificial blood vessel.

[0049] Attached Figure 1 , 2 The structures represented by the labels are listed below:

[0050] 1. Motor; 2. Linear module; 3. Rotary chuck; 4. Connecting rod; 5. Clamp body; 501. First clamp arm; 6. Braided artificial blood vessel; 7. First vertical pole; 8. Second vertical pole; 9. First laser distance sensor; 10. Second laser distance sensor. DETAILED DESCRIPTION

[0051] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0052] Example 1

[0053] like Figure 1 As shown, the impurity detection system for the inner wall of a braided artificial blood vessel comprises: a frame; a blood vessel clamping device arranged on the upper part of the frame; and an impurity detection device arranged on the lower part of the frame. Based on this technical solution, the wall thickness of a naturally drooping braided artificial blood vessel can be detected, so as to judge whether there are thread ends attached to the inner wall of the artificial blood vessel based on the thickness.

[0054] Example 2

[0055] On the basis of Example 1, Figure 1 , 2As shown, the blood vessel clamping device includes: a rotating chuck 3; and a driving mechanism that drives the rotating chuck 3 to move up and down or rotate horizontally. The driving mechanism includes a chassis, in which a linear module 2 is vertically arranged, and the moving part of the linear module 2 is fixedly connected to a motor 1, which is arranged vertically and the output shaft of the motor 1 is arranged downward. In other embodiments, a pair of synchronous linear modules can be provided.

[0056] The rotary chuck 3 includes a vertically arranged drum, the upper bottom wall of which is fixedly connected to the output shaft of the motor 1 through a connecting rod 4, and the drum, the connecting rod 4 and the output shaft of the motor 1 are coaxially arranged. A plurality of clamp bodies 5 are arranged around the peripheral wall of the lower part of the drum, and the number can be 3 to 6. The clamp body 5 includes a first clamp arm 501, a torsion spring and a second clamp arm, the second clamp arm is fixedly arranged in a groove opened on the outer wall of the drum, the clamping mouths of the first clamp arm 501 and the second clamp arm are arranged in corresponding arc shapes, and the first clamp arm 501, the second clamp arm and the groove are arranged vertically.

[0057] Based on this technical solution, the natural drooping of the braided artificial blood vessel after clamping, the up and down movement and horizontal rotation of the braided artificial blood vessel can be achieved.

[0058] Example 3

[0059] On the basis of Example 2, Figure 1 As shown, the impurity detection device includes: a first vertical pole 7 fixedly arranged below the rotating chuck 3, a first laser distance sensor 9 fixedly arranged on the upper part of the first vertical pole 7; and a second vertical pole 8 fixedly arranged, a second laser distance sensor 10 fixedly arranged on the upper part of the second vertical pole 8, and the second vertical pole 8 is located outside the horizontal projection area of ​​the rotating chuck 3. The measurement path of the first laser distance sensor 9 is along the radial direction of the rotating drum. The measurement path of the second laser distance sensor 10 is along the radial direction of the rotating drum. The projections of the measurement paths of the first laser distance sensor 9 and the second laser distance sensor 10 on the horizontal plane are collinear.

[0060] The first laser distance measuring sensor 9 and the second laser distance measuring sensor 10 are arranged opposite to each other, and the measuring paths are collinear. Thus, the horizontal distance between the first laser distance measuring sensor 9 and the second laser distance measuring sensor 10 covers the thickness of the tube wall area measured by the braided artificial blood vessel.

[0061] Example 4

[0062] On the basis of Example 3, the system further includes a controller, which is electrically connected to the linear module 2, the motor 1, the first laser ranging sensor 9, the second laser ranging sensor 10, the control panel and the display.

[0063] Example 5

[0064] The braided artificial blood vessel inner wall impurity detection system of embodiment 3 or 4 is used, and the horizontal spacing C between the first laser ranging sensor 9 and the second laser ranging sensor 10 is the design value, specifically 20 mm. The wall thickness S of the braided artificial blood vessel 6 is the design value, specifically 0.50 mm.

[0065] The method for detecting impurities on the inner wall of a braided artificial blood vessel specifically comprises the following steps:

[0066] 1) Clamp the upper end of the braided artificial blood vessel 6 on the rotating chuck 3, and let the lower end droop naturally. Move the rotating chuck 3 downward to cover the middle part of the braided artificial blood vessel 6 outside the first laser ranging sensor 9;

[0067] 2) The first laser distance sensor 9 is used to measure the distance, and the horizontal distance A between the inner wall of the braided artificial blood vessel 6 is obtained, which is specifically 4.72 mm; the second laser distance sensor 10 is used to measure the distance, and the horizontal distance B between the outer wall of the braided artificial blood vessel 6 is obtained, which is specifically 14.64;

[0068] 3) Calculate the wall thickness Sx, such as Figure 3 As shown, Sx = CAB = 0.64;

[0069] 4) Calculate the ratio of Sx to S, which is 1.28.

[0070] Since the ratio is greater than 120%, it is detected as having impurities. The impurities are extracted from the inner wall surface of the detection area, which is consistent with the detection result.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A braided artificial blood vessel inner wall impurity detection system, characterized in that: include: Frame; A blood vessel clamping device disposed on the upper portion of the frame; And an impurity detection device is arranged at the lower part of the frame.

2. The impurity detection system for the inner wall of a braided artificial blood vessel according to claim 1 is characterized in that: The blood vessel clamping device comprises: Rotating chuck (3); And a driving mechanism for driving the rotating chuck (3) to move up and down or rotate horizontally.

3. The impurity detection system for the inner wall of a braided artificial blood vessel according to claim 2, characterized in that: The driving mechanism comprises a chassis, in which at least one linear module (2) is vertically arranged, the moving part of the linear module (2) is fixedly connected to a motor (1), the motor (1) is vertically arranged, and the output shaft of the motor (1) is downwardly arranged.

4. The impurity detection system for the inner wall of a braided artificial blood vessel according to claim 3, characterized in that: The rotary chuck (3) comprises a vertically arranged rotating drum, the upper bottom wall of the rotating drum is fixedly connected to the output shaft of the motor (1) via a connecting rod (4), the rotating drum, the connecting rod (4) and the output shaft of the motor (1) are coaxially arranged, and a plurality of chucks (5) are arranged around the peripheral wall of the lower part of the rotating drum.

5. The impurity detection system for the inner wall of a braided artificial blood vessel according to claim 4, characterized in that: The clamp body (5) comprises a first clamp arm (501), a torsion spring and a second clamp arm, the second clamp arm being fixedly arranged in a groove provided on the outer wall of the rotating drum, the clamping mouths of the first clamp arm (501) and the second clamp arm being arranged in corresponding arc shapes, and the first clamp arm (501), the second clamp arm and the groove being arranged vertically.

6. The impurity detection system for the inner wall of a braided artificial blood vessel according to claim 5, characterized in that: The impurity detection device comprises: A first vertical pole (7) is fixedly arranged below the rotating chuck (3), and a first laser distance measuring sensor (9) is fixedly arranged on the upper part of the first vertical pole (7); and a fixedly arranged second vertical pole (8), a second laser distance measuring sensor (10) being fixedly arranged on the upper part of the second vertical pole (8), and the second vertical pole (8) being located outside the horizontal projection area of ​​the rotating chuck (3); The first laser distance measuring sensor (9) and the second laser distance measuring sensor (10) are arranged opposite to each other.

7. The impurity detection system for the inner wall of a braided artificial blood vessel according to claim 6, characterized in that: The measuring path of the first laser distance measuring sensor (9) is along the radial direction of the drum; The measuring path of the second laser distance measuring sensor (10) is along the radial direction of the drum; The projections of the measurement path of the first laser distance measuring sensor (9) and the measurement path of the second laser distance measuring sensor (10) on a horizontal plane are collinear.

8. The impurity detection system for the inner wall of a braided artificial blood vessel according to claim 7, characterized in that: The system further comprises a controller which is electrically connected to the linear module (2), the motor (1), the first laser distance measuring sensor (9) and the second laser distance measuring sensor (10).

9. A method for detecting impurities on the inner wall of a braided artificial blood vessel, characterized in that: The system according to any one of claims 6 to 8 is used to detect impurities on the inner wall of a braided artificial blood vessel, specifically comprising the following steps: 1) The upper end of the braided artificial blood vessel (6) is clamped on the rotating clamp (3), and the lower end is naturally drooped, and the braided artificial blood vessel (6) is covered outside the first laser distance sensor (9) by moving the rotating clamp (3) downward; the horizontal distance C between the first laser distance sensor (9) and the second laser distance sensor (10) is obtained; and the designed wall thickness S of the braided artificial blood vessel (6) is obtained; 2) measuring the distance using a first laser distance measuring sensor (9) to obtain a horizontal distance A from the inner wall of the braided artificial blood vessel (6); measuring the distance using a second laser distance measuring sensor (10) to obtain a horizontal distance B from the outer wall of the braided artificial blood vessel (6); 3) Calculate the wall thickness Sx, Sx = CAB; 4) Calculate the ratio of Sx to S; 5) When the ratio is greater than or equal to 120%, it is detected as having impurities.

10. The method for detecting impurities on the inner wall of a braided artificial blood vessel according to claim 9, characterized in that: The method further comprises step 6): moving the braided artificial blood vessel (6) up and down and / or rotating the braided artificial blood vessel (6) to detect impurities in different parts.

Images