Tube cutting device for medical sheath preparation

Abstract

The application discloses a medical sheath preparation hose cutting device, which comprises a control part, a servo traction part, four clamping parts, four shaping parts, a cutting part, a conveying part and a collecting part. The clamping part comprises a first electric telescopic rod and a clamping block. The shaping part comprises a second electric telescopic rod, a mounting plate, an inner suction block connected with the mounting plate through a first rubber block, a first hard pipe communicated with an inner cavity of the inner suction block, a first vacuum pressure sensor mounted on the first hard pipe, a first vacuum pump connected with the first hard pipe through a first pipeline, an outer suction block connected with the mounting plate through a second rubber block, a second hard pipe communicated with an inner cavity of the outer suction block, a second vacuum pressure sensor mounted on the second hard pipe and a second vacuum pump connected with the second hard pipe through a second pipeline. The cutting device can improve the cutting quality of the hose and can grade the cutting quality.

Description

Technical Field

[0001] This application relates to the medical field, specifically to a medical sheath control spare hose cutting device. Background Technology

[0002] Interventional catheters (such as balloon catheters and sheaths) are core consumables in minimally invasive surgeries such as cardiovascular and neurointerventional procedures. The single-layer balloon tubing that forms the inflatable balloon at the tip of the balloon catheter, and the single-layer sheath that forms the catheter body, are typically formed by continuous extrusion of polymer materials. Interventional catheters have extremely high requirements for the outer diameter, wall thickness, concentricity, and mechanical properties of the tubing material.

[0003] In the cutting process, traditional cutting methods face significant challenges due to the extremely thin walls, soft material, and low elastic modulus of the aforementioned single-layer hose. Currently, the common cutting method in the industry involves vertically pressing the hose from top to bottom using a guillotine or chaff cutter. However, because the hose is too flexible, the material is prone to radial collapse, springback, or even slippage when the cutter presses down, resulting in skewed cuts, uneven end faces, and in severe cases, burrs or tears at the cut, directly affecting the yield of subsequent balloon blowing, tip forming, or welding processes.

[0004] Furthermore, in terms of quality inspection, existing cutting equipment generally lacks online detection methods for the roundness of hoses before cutting. Operators can often only judge the cut quality by manual sampling or offline microscopic observation after cutting, and cannot identify hose flattening problems caused by clamping or incoming material defects in real time, nor can they automatically grade and sort the cut workpieces according to the degree of flattening. This leads to the mixing of defective and qualified products, which not only increases the scrap rate of subsequent processes, but also makes it impossible to distinguish between minor repairable defects and serious scrap defects, resulting in material waste. Summary of the Invention

[0005] Purpose of the invention: This application aims to overcome the deficiencies of the prior art and provide a cutting device for medical sheath control spare tubing.

[0006] Technical Solution: A medical sheath tube spare hose cutting device, comprising a control unit, a servo traction unit, four clamping units, four shaping units, a cutting unit, a conveying unit, and a collecting unit; the servo traction unit is used to pull the hose; the conveying unit is used to convey the cut hose downstream; the collecting unit is used to collect the cut hose; the clamping unit includes a first electric telescopic rod and a clamping block with an arc-shaped groove connected to the first electric telescopic rod; the shaping unit includes a second electric telescopic rod, a mounting plate connected to the second electric telescopic rod, an inner suction block connected to the mounting plate via a first rubber block, and an inner cavity of the inner suction block. The system comprises a first rigid tube, a first vacuum pressure sensor mounted on the first rigid tube, a first vacuum pump connected to the first rigid tube via a first pipe, an outer suction block connected to a mounting plate via a second rubber block, a second rigid tube communicating with the inner cavity of the outer suction block, a second vacuum pressure sensor mounted on the second rigid tube, and a second vacuum pump connected to the second rigid tube via a second pipe. The inner suction block has an arc-shaped groove with multiple first suction holes at the arc-shaped groove, and the outer suction block has an arc-shaped groove with second suction holes at the arc-shaped groove. The cutting part includes a support base, a third electric telescopic rod, and a cutter connected to the third electric telescopic rod.

[0007] Furthermore, it also includes a frame, on which the first, second, and third electric telescopic rods are all mounted.

[0008] Furthermore, the first suction hole is connected to the inner cavity of the inner suction block; the second suction hole is connected to the inner cavity of the outer suction block.

[0009] Furthermore, both the first and second pipes are polyurethane hoses.

[0010] In some embodiments, both the first pipe and the second pipe are corrugated pipes.

[0011] Furthermore, the four clamping parts are divided into two groups, namely the upstream group and the downstream group. Both the upstream group and the downstream group have two clamping parts, and the driving direction of the four first electric telescopic rods is vertical. The four shaping parts are located between the upstream group and the downstream group.

[0012] Furthermore, along the length of the hose, the distances from the inner suction blocks of the four shaping sections to the support base are equal, and the distances from the outer suction blocks of the four shaping sections to the support base are equal.

[0013] Furthermore, along the length of the hose, the inner suction block is closer to the support seat than the outer suction block.

[0014] Furthermore, the four shaping parts are a first shaping part and a second shaping part. The axes of the two second electric telescopic rods of the first shaping part are collinear, and the axes of the two second electric telescopic rods of the second shaping part are collinear. The axes of the second electric telescopic rods of the first shaping part and the second electric telescopic rods of the second shaping part are perpendicular. The driving direction of the second electric telescopic rod of the first shaping part is at a 45-degree angle to the horizontal plane, and the driving direction of the second electric telescopic rod of the second shaping part is at a 45-degree angle to the horizontal plane.

[0015] Furthermore, the upstream group and the support base have two inner suction blocks and two outer suction blocks; the downstream group and the support base have two inner suction blocks and two outer suction blocks.

[0016] Furthermore, both the first and second rigid tubes pass through the mounting plate; the inner suction block is connected to the mounting plate via two first rubber blocks, and the outer suction block is connected to the mounting plate via two second rubber blocks.

[0017] Furthermore, the arc-shaped groove contains an arc-shaped gasket.

[0018] Furthermore, the curved gasket is made of rubber material.

[0019] This avoids damage to the hose surface during clamping, and the curved gasket provides a certain degree of elastic cushioning when clamping the hose.

[0020] Furthermore, the support base has an arc-shaped groove, and the arc-shaped groove has a slot into which a cutter can be inserted.

[0021] Furthermore, the mounting plates of two of the four shaping sections have strip-shaped through slots.

[0022] Thus, the strip groove can provide clearance for the downward movement of the cutter.

[0023] Furthermore, the conveying section is a conveyor belt unit, which includes a driving roller, a driven roller, a driving roller drive unit for driving the driving roller, and a conveyor belt connecting the driving roller and the driven roller.

[0024] The cut hoses are then conveyed by the conveyor and discharged into the collection container.

[0025] Furthermore, the collecting unit includes a base plate, a limiting slide rail fixed to the base plate, a first end plate fixed to the base plate, a second end plate fixed to the base plate, a drive motor mounted on the first end plate, a bearing mounted on the second end plate, a lead screw connecting the drive motor and the bearing, a translation plate, and three collecting containers fixed at the translation plate. The translation plate has a limiting slide groove that cooperates with the limiting slide rail and a threaded channel that cooperates with the lead screw.

[0026] Thus, the translation plate can be translated under the drive of the drive motor, so that one of the three collection containers can be selected to collect the cut hose.

[0027] Furthermore, the three collection containers are designated as a first collection container, a second collection container, and a third collection container. The control unit controls the collection of the cut hose in the following ways: when the absolute values ​​of the measurements from the four first vacuum pressure sensors and the four second vacuum pressure sensors of the four shaping sections are all greater than or equal to a set threshold during cutting, the cut hose is collected using the first collection container; when the absolute value of the measurement from one or more of the four first vacuum pressure sensors of the four shaping sections is less than the set threshold and the absolute values ​​of the measurements from the four second vacuum pressure sensors are all greater than or equal to the set threshold during cutting, the cut hose is collected using the second collection container; and when the absolute value of the measurement from one or more of the four first vacuum pressure sensors of the four shaping sections is less than the set threshold and the absolute value of the measurement from one or more of the four second vacuum pressure sensors is less than the set threshold during cutting, the cut hose is collected using the third collection container.

[0028] Furthermore, the vacuum pressure sensor of this application measures negative values; the larger the absolute value of the negative value, the higher the vacuum level.

[0029] Beneficial effects: The cutting equipment of this application has the following advantages over the prior art,

[0030] (1) By combining physical clamping with negative pressure shaping, the clamping part provides mechanical fixation, and the shaping part uses negative pressure adsorption to shape the hose, so that the hose maintains a good roundness at the cutting position and will not be flattened, thereby effectively avoiding the radial collapse or elliptic problem caused by traditional clamping methods, and ensuring that the cut is flat and has high perpendicularity.

[0031] (2) The shaping part performs negative pressure shaping on the hose from the cross direction, so that the hose is subjected to balanced adsorption force in multiple circumferential directions, resulting in better shaping effect and effectively suppressing cross-sectional distortion caused by local hardness fluctuations or slight bending of the material.

[0032] (3) The rigid tube connected to the suction block has a vacuum pressure sensor, which can detect whether the hose is flattened during cutting based on the vacuum level (air leakage will occur when flattened), thus realizing real-time online identification of flattening defects.

[0033] (4) The negative pressure shaping has an inner suction block and an outer suction block, so that the cutting quality of the hose can be divided into multiple levels according to whether the hose leaks air at the inner suction block and the outer suction block. The different levels are classified and collected to realize the graded management of the soft cutting quality. Attached Figure Description

[0034] Figure 1A first-view diagram of the cutting device during traction;

[0035] Figure 2 for Figure 1 Enlarged view of region A;

[0036] Figure 3 A schematic diagram of the cutting device from a second perspective during traction;

[0037] Figure 4 This is a schematic diagram of the cutting device during the cutting process. Detailed Implementation

[0038] Reference numerals: 1. Hoose; 2. Servo traction unit; 3. Conveying unit;

[0039] 4. Collection section; 4.1 Base plate; 4.2 Limiting slide rail; 4.3 Translation plate; 4.4 Drive motor; 4.5 Lead screw; 4.6 Collection container;

[0040] 5.1 Third electric telescopic pole; 5.2 Cutter; 5.3 Support base;

[0041] 6.1 First electric telescopic rod; 6.2 Clamping block; 6.3 Arc-shaped washer;

[0042] 7.1 Second electric telescopic rod; 7.2 Mounting plate; 7.3 First rubber block; 7.4 Inner suction block; 7.5 First rigid tube; 7.6 First vacuum pressure sensor; 7.7 Second rubber block; 7.8 Outer suction block; 7.9 Second rigid tube; 7.10 Second vacuum pressure sensor.

[0043] like Figure 1-4As shown, a medical sheath tube spare hose cutting device includes a control unit, a servo traction unit 2, four clamping units, four shaping units, a cutting unit, a conveying unit 3, and a collecting unit 4. The servo traction unit 2 is used to pull the hose 1; the conveying unit 3 is used to convey the cut hose 1 downstream; the collecting unit 4 is used to collect the cut hose 1; the clamping unit includes a first electric telescopic rod 6.1 and a clamping block 6.2 with an arc-shaped groove connected to the first electric telescopic rod 6.1; the shaping unit includes a second electric telescopic rod 7.1, a mounting plate 7.2 connected to the second electric telescopic rod 7.1, an inner suction block 7.4 connected to the mounting plate 7.2 via a first rubber block 7.3, a first rigid tube 7.5 communicating with the inner cavity of the inner suction block 7.4, and a component mounted on the first... The system comprises a first vacuum pressure sensor 7.6 connected to the first rigid tube 7.5 via a first pipe (not shown in the figure), an outer suction block 7.8 connected to the mounting plate 7.2 via a second rubber block 7.7, a second rigid tube 7.9 communicating with the inner cavity of the outer suction block 7.8, a second vacuum pressure sensor 7.10 mounted on the second rigid tube 7.9, and a second vacuum pump (not shown in the figure) connected to the second rigid tube 7.9 via a second pipe. The inner suction block 7.4 has an arc-shaped groove with multiple first suction holes, and the outer suction block 7.8 has an arc-shaped groove with second suction holes. The cutting part includes a support base 5.3, a third electric telescopic rod 5.1, and a cutter 5.2 connected to the third electric telescopic rod 5.1. Both the first pipe and the second pipe are polyurethane flexible hoses.

[0044] The four clamping parts are divided into two groups, namely the upstream group and the downstream group. Both the upstream group and the downstream group have two clamping parts. The driving direction of the four first electric telescopic rods 6.1 is vertical. The four shaping parts are located between the upstream group and the downstream group. Along the length of the hose 1, the distances from the inner suction blocks 7.4 of the four shaping parts to the support base are equal, and the distances from the outer suction blocks 7.8 of the four shaping parts to the support base 5.3 are equal. Along the length of the hose 1, the inner suction block 7.4 is closer to the support base 5.3 than the outer suction block 7.8. The four shaping parts are a first group of shaping parts and a second group of shaping parts. The axes of the two second electric telescopic rods 7.1 of the first group of shaping parts are collinear, and the axes of the two second electric telescopic rods 7.1 of the second group of shaping parts are collinear. The axes of the second electric telescopic rods 7.1 of the first group of shaping parts and the second electric telescopic rods 7.1 of the second group of shaping parts are perpendicular. The driving direction of the second electric telescopic rods 7.1 of the first group of shaping parts forms a 45-degree angle with the horizontal plane, and the driving direction of the second electric telescopic rods 7.1 of the second group of shaping parts forms a 45-degree angle with the horizontal plane. There are two inner suction blocks and two outer suction blocks between the upstream group and the support base 5.3; there are two inner suction blocks 7.4 and two outer suction blocks 7.8 between the downstream group and the support base 5.3. The first rigid tube 7.5 and the second rigid tube 7.9 both pass through the mounting plate 7.2; the inner suction blocks 7.4 are connected to the mounting plate 7.2 via two first rubber blocks 7.3, and the outer suction blocks 7.8 are connected to the mounting plate 7.2 via two second rubber blocks 7.7. An arc-shaped gasket 6.3 is provided within the arc-shaped groove. The arc-shaped gasket 6.3 is made of rubber material. The support base 5.3 has an arc-shaped groove, and the arc-shaped groove has a slot into which the cutter 5.2 can be inserted; the mounting plates 7.2 of two of the four shaping sections have strip-shaped through slots. The conveying section 3 is a conveyor belt unit, which includes a driving roller, a driven roller, a driving roller drive unit for driving the driving roller, and a conveyor belt connecting the driving roller and the driven roller. The collecting unit 4 includes a base plate 4.1, a limiting slide rail 4.2 fixed to the base plate 4.1, a first end plate fixed to the base plate 4.1, a second end plate fixed to the base plate, a drive motor 4.4 mounted on the first end plate, a bearing mounted on the second end plate, a lead screw 4.5 connecting the drive motor 4.4 and the bearing, a translation plate 4.3, and three collecting containers 4.6 fixed at the translation plate 4.3. The translation plate 4.3 has a limiting slide groove that mates with the limiting slide rail 4.2 and a threaded channel that mates with the lead screw 4.5.The three collection containers 4.6 are designated as a first collection container, a second collection container, and a third collection container. The control unit controls the collection of the cut hose 1. When the absolute values ​​of the measurements from the four first vacuum pressure sensors 7.6 and the four second vacuum pressure sensors 7.10 of the four shaping sections are all greater than or equal to a set threshold during cutting, the cut hose 1 is collected using the first collection container. When the absolute value of the measurement from one or more of the four first vacuum pressure sensors 7.6 of the four shaping sections is less than the set threshold and the absolute values ​​of the measurements from the four second vacuum pressure sensors 7.10 are all greater than or equal to the set threshold, the cut hose 1 is collected using the second collection container. When the absolute value of the measurement from one or more of the four first vacuum pressure sensors 7.6 of the four shaping sections is less than the set threshold and the absolute value of the measurement from one or more of the four second vacuum pressure sensors 7.10 is less than the set threshold, the cut hose 1 is collected using the third collection container.

[0045] like Figure 1-4 As shown, the hose cutting device of this application can be used in an online production line. After drying, the raw material enters an extruder for melt extrusion, and is then sized and cooled in a water bath. The dimensions are monitored in real time by an online laser diameter measuring instrument and an ultrasonic wall thickness gauge. Finally, it is pulled by a servo traction unit to the subsequent cutting station. The hose cutting device of this application can also be used in an unwinding production line. The wound hose is pulled by a servo traction unit through guide rollers and other components to perform the subsequent cutting steps.

[0046] Specifically, in the device described in this application, the hose is pulled by a servo traction device, thereby enabling precise control of the traction length. After the hose passes the support base and is pulled a fixed distance (the traction length can be set as needed), the clamping part clamps the hose. This clamping block can hold the hose in place, preventing it from moving along its length and avoiding deformation. The shaping part can use negative pressure to adhere to the hose, further preventing deformation. Figure 4 As shown, it has four inner suction blocks and four outer suction blocks. Two inner suction blocks form a group to wrap and adsorb the hose, and two outer suction blocks form a group to wrap and adsorb the hose. The directions of the inner suction blocks in different groups are perpendicular to each other, and the directions of the outer suction blocks in different groups are perpendicular to each other, so that the hose is adsorbed from the cross direction, resulting in a good negative pressure adsorption effect and the hose is not easily deformed.

[0047] Furthermore, a vacuum pressure sensor can be used to detect air leaks between the hose, the inner suction block, and the outer suction block, thereby grading the cutting quality. The specific process is as follows:

[0048] The control unit controls the cutting of the hose. When the absolute values ​​of the measurements from the four first vacuum pressure sensors and four second vacuum pressure sensors in the four shaping sections are all greater than or equal to a set threshold during cutting (indicating no air leakage at the positions of the four inner and four outer suction blocks, indicating no deformation of the hose during cutting and high cutting quality), the cut hose is collected using the first collection container. When the absolute value of the measurement from one or more of the four first vacuum pressure sensors in the four shaping sections is less than the set threshold, and the absolute values ​​of the measurements from the four second vacuum pressure sensors are all greater than or equal to the set threshold (indicating a slight change in the cutting position of the hose), the cut hose is collected using the first collection container. The cut hose is collected using a second collection container when the absolute value of the measurement value of one or more of the four first vacuum pressure sensors of the four shaping parts is less than a set threshold and the absolute value of the measurement value of one or more of the four second vacuum pressure sensors is less than a set threshold (indicating that the cut position of the hose is significantly deformed during cutting, and air leakage occurs at both the inner and outer suction blocks, and deformation and air leakage occur at the outer suction block farther from the cut, resulting in poor cut quality).

[0049] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present invention without departing from the scope defined by the claims.

Claims

1. A device for cutting spare tubing in a medical sheath, characterized in that, The system includes a control unit, a servo traction unit, four clamping units, four shaping units, a cutting unit, a conveying unit, and a collecting unit. The servo traction unit is used to pull the hose. The conveying unit is used to transport the cut hose downstream. The collecting unit is used to collect the cut hose. The clamping unit includes a first electric telescopic rod and a clamping block with an arc-shaped groove connected to the first electric telescopic rod. The shaping unit includes a second electric telescopic rod, a mounting plate connected to the second electric telescopic rod, an inner suction block connected to the mounting plate via a first rubber block, a first rigid tube communicating with the inner cavity of the inner suction block, and a component mounted on... The first rigid tube includes a first vacuum pressure sensor, a first vacuum pump connected to the first rigid tube via a first pipe, an outer suction block connected to a mounting plate via a second rubber block, a second rigid tube communicating with the inner cavity of the outer suction block, a second vacuum pressure sensor installed on the second rigid tube, and a second vacuum pump connected to the second rigid tube via a second pipe. The inner suction block has an arc-shaped groove with multiple first suction holes at the arc-shaped groove, and the outer suction block has an arc-shaped groove with second suction holes at the arc-shaped groove. The cutting part includes a support base, a third electric telescopic rod, and a cutter connected to the third electric telescopic rod.

2. The medical sheath control spare tubing cutting device according to claim 1, characterized in that, The four clamping parts are divided into two groups, namely the upstream group and the downstream group. Both the upstream group and the downstream group have two clamping parts. The driving direction of the four first electric telescopic rods is vertical. The four shaping parts are located between the upstream group and the downstream group.

3. The medical sheath control spare tubing cutting device according to claim 1, characterized in that, Along the length of the hose, the distances from the inner suction blocks of the four shaping sections to the support base are equal, and the distances from the outer suction blocks of the four shaping sections to the support base are equal. Along the length of the hose, the inner suction blocks are closer to the support base than the outer suction blocks. The four shaping sections are a first group of shaping sections and a second group of shaping sections. The axes of the two second electric telescopic rods of the first group of shaping sections are collinear, and the axes of the two second electric telescopic rods of the second group of shaping sections are collinear. The axes of the second electric telescopic rods of the first group of shaping sections and the second electric telescopic rods of the second group of shaping sections are perpendicular. The driving direction of the second electric telescopic rods of the first group of shaping sections forms a 45-degree angle with the horizontal plane, and the driving direction of the second electric telescopic rods of the second group of shaping sections forms a 45-degree angle with the horizontal plane.

4. The medical sheath control spare tubing cutting device according to claim 1, characterized in that, Both the first and second rigid tubes pass through the mounting plate; the inner suction block is connected to the mounting plate via two first rubber blocks, and the outer suction block is connected to the mounting plate via two second rubber blocks.

5. The medical sheath control spare tubing cutting device according to claim 1, characterized in that, The arc-shaped groove contains an arc-shaped gasket.

6. The medical sheath control spare tubing cutting device according to claim 1, characterized in that, The support base has an arc-shaped groove, and the arc-shaped groove has a slot into which a cutter can be inserted; the mounting plates of two of the four shaping parts have strip-shaped through slots.

7. The medical sheath control spare tubing cutting device according to claim 1, characterized in that, The conveying section is a conveyor belt unit, which includes a drive roller, a driven roller, a drive roller drive unit for driving the drive roller, and a conveyor belt connecting the drive roller and the driven roller.

8. The medical sheath control spare tubing cutting device according to claim 3, characterized in that, The collecting unit includes a base plate, a limiting slide rail fixed to the base plate, a first end plate fixed to the base plate, a second end plate fixed to the base plate, a drive motor mounted on the first end plate, a bearing mounted on the second end plate, a lead screw connecting the drive motor and the bearing, a translation plate, and three collecting containers fixed at the translation plate. The translation plate has a limiting slide groove that cooperates with the limiting slide rail and a threaded channel that cooperates with the lead screw.

9. The medical sheath control spare tubing cutting device according to claim 7, characterized in that, The three collection containers are designated as a first collection container, a second collection container, and a third collection container. The control unit controls the collection of the cut hose. When the absolute values ​​of the measurements from the four first vacuum pressure sensors and the four second vacuum pressure sensors in the four shaping sections are all greater than or equal to a set threshold during cutting, the cut hose is collected using the first collection container. When the absolute value of the measurement from one or more of the four first vacuum pressure sensors in the four shaping sections is less than the set threshold, and the absolute values ​​of the measurements from the four second vacuum pressure sensors are all greater than or equal to the set threshold, the cut hose is collected using the second collection container. When the absolute value of the measurement from one or more of the four first vacuum pressure sensors in the four shaping sections is less than the set threshold, and the absolute value of the measurement from one or more of the four second vacuum pressure sensors is less than the set threshold, the cut hose is collected using the third collection container.

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