Medical miniature feed-through deformation measuring tool

Abstract

The utility model relates to the field of feed-through deformation measurement, in particular to a medical miniature feed-through deformation measuring tool which comprises a base, a positioning groove matched with a medical feed-through in shape is formed in one side of the upper surface of the base, and the other side of the upper surface of the base is movably connected with a pressing device. The pressing device comprises a pressing piece and an adjusting rod; the pressing piece comprises a sleeve and a pressing piece which are vertically arranged in parallel, and the sleeve and the pressing piece are connected through a connecting rod; a first cavity and a second cavity are formed in the sleeve from top to bottom, and an elastic piece is arranged in the first cavity; the adjusting rod penetrates through the elastic piece and the second cavity and then is in threaded connection with the base; the pressing piece can rotate to the position above the positioning groove. A non-contact measurement mode is used, and accurate measurement is achieved on the premise that feed-through is not damaged.

Description

Technical Field

[0001] This utility model relates to the field of feedthrough deformation measurement technology, specifically a medical micro feedthrough deformation measurement fixture. Background Technology

[0002] In the field of medical device manufacturing, medical micro feedthroughs are key components, typically containing multiple platinum-iridium alloy wires with a diameter of only 0.05-0.2 mm, which possess high melting points and corrosion resistance. These platinum-iridium alloy wires not only perform signal / energy transmission functions but also need to maintain structural stability in harsh environments such as high-temperature sterilization and high-frequency vibration.

[0003] However, existing measurement technologies have the following prominent problems: contact measurement is prone to damaging the filament. Traditional mechanical clamps or electronic probes are prone to physical contact with the platinum-iridium alloy wire during the fixing / measurement process, which can lead to bending or even breakage of the filament (according to statistics, the contact damage rate of traditional clamps is 15%-20%).

[0004] The measurement error of irregular structures is large. Some medical feedthroughs adopt irregular irregular designs (such as snake-shaped or spiral-shaped). Existing non-contact measurement methods such as laser scanning or machine vision require the pre-set standard model matching, and the measurement error of the deformation of irregular structures is as high as ±0.1mm or more.

[0005] Traditional pneumatic or electric clamps require a clamping force of more than 50N to ensure stability when fixing the feedthrough. However, platinum-iridium alloy wire will undergo plastic deformation under an external force of more than 30N, resulting in distorted measurement results. Utility Model Content

[0006] To address the technical problems mentioned above, this invention effectively solves the protection problem of platinum-iridium alloy wire through non-contact feeler gauge measurement and low-stress fixing design.

[0007] The technical solution of this utility model is as follows:

[0008] A medical micro feedthrough deformation measuring fixture includes a base, one side of which is provided with a positioning groove adapted to the shape of the medical feedthrough, and the other side is movably connected to a clamping device.

[0009] The clamping device includes a clamping element and an adjusting rod;

[0010] The clamping components include a vertically and parallelly arranged sleeve and a lower clamping component, which are connected by a connecting rod;

[0011] The sleeve has a first cavity and a second cavity arranged from top to bottom, and an elastic element is arranged in the first cavity;

[0012] After passing through the elastic element and the second cavity, the adjusting rod is threaded onto the base;

[0013] The pressing part can rotate to the top of the positioning groove.

[0014] The positioning groove runs through the base.

[0015] The upper surface of the base is flush.

[0016] Furthermore, marble was chosen as the base material, and the lower part of the medical feeder was placed in the positioning groove. A feeler gauge was inserted between the upper part of the medical feeder and the upper surface of the base to measure the amount of deformation.

[0017] The first cavity and the second cavity are circular holes, with the diameter of the first cavity being larger than that of the second cavity.

[0018] The first cavity and the second cavity are coaxial.

[0019] The lower end of the pressing component has an arc-shaped structure, and the radius of curvature of the arc surface is set according to the shape of the medical feedthrough.

[0020] The lower end of the pressing component is also inlaid with a silicone cushioning pad.

[0021] The elastic element is a spring, and it is always under compression.

[0022] The upper end of the spring is connected to the head of the adjusting rod, and the lower end is connected to the interface between the two cavities.

[0023] The height of the adjusting rod is greater than that of the sleeve, and the connecting rod is connected to the upper part of the sleeve and the lower pressure piece.

[0024] The beneficial effects of this utility model are as follows:

[0025] Non-contact measurement: The lower part of the medical feeder is placed in the positioning groove, and a feeler gauge is inserted between the upper part of the medical feeder and the upper surface of the base. The feeler gauge measurement does not require contact with the fine wire, and the amount of structural deformation is indirectly reflected only by the gap size between the feeder and the base.

[0026] The elastic element provides flexible clamping force, which ensures feedthrough stability while avoiding exceeding the yield strength of the medical feedthrough filament material;

[0027] The high-precision mating surfaces of the base and the clamping device ensure the consistency of gap measurements in various parts of the irregular feeder, keeping the measurement error of the irregular structure within ±0.01mm; and the base is made of marble, which can maintain a constant temperature and reduce measurement errors caused by thermal expansion. Attached Figure Description

[0028] In the attached diagram:

[0029] Figure 1 This is a structural diagram of the present invention;

[0030] Figure 2 This is a partial perspective view of the present invention;

[0031] The components represented by the various reference numerals in the diagram are:

[0032] 1. Base; 2. Positioning groove; 3. Medical feedthrough; 4. Clamping device; 41. Clamping component; 411. Sleeve; 412. Pressing component; 42. Elastic component; 43. Connecting rod; 44. Adjusting rod. Detailed Implementation

[0033] Example 1

[0034] The technical solution of this utility model is as follows:

[0035] To address the technical problems mentioned above, this invention effectively solves the protection problem of platinum-iridium alloy wire through non-contact feeler gauge measurement and low-stress fixing design.

[0036] The technical solution of this utility model is as follows:

[0037] Reference Figure 1 A medical micro feeder deformation measurement fixture includes a base 1, with a positioning groove 2 adapted to the shape of the medical feeder 3 on one side of its upper surface, and a clamping device 4 movably connected to the other side.

[0038] The clamping device 4 includes a clamping element 41 and an adjusting rod 44;

[0039] The clamping member 41 includes a sleeve 411 and a pressing member 412 arranged vertically and in parallel, which are connected by a connecting rod 43.

[0040] The sleeve 411 has a first cavity and a second cavity arranged from top to bottom, and the first cavity is provided with an elastic element 42;

[0041] After passing through the elastic element 42 and the second cavity, the adjusting rod 44 is threaded onto the base 1;

[0042] The pressing member 412 can rotate to be above the positioning groove 2.

[0043] The height of the adjusting rod 44 is greater than that of the sleeve 411. The connecting rod 43 is connected to the upper part of the sleeve 411 and the pressing part 412. When different models of medical feeders 3 are placed in the positioning groove 2, the height of the pressing part is adjusted by adjusting the adjusting rod 44 to achieve the purpose of matching with different models of medical feeders 3. The height of the adjusting rod 44 is greater than that of the sleeve 411, which can leave room for the operator's operation while matching.

[0044] The first cavity and the second cavity are circular holes, with the diameter of the first cavity being larger than that of the second cavity, and the first cavity and the second cavity being coaxial.

[0045] The lower end of the pressing component 412 has an arc surface structure, and the radius of curvature of the arc surface is set according to the shape of the medical feeder 3. The lower end of the pressing component 412 is also inlaid with a silicone buffer pad, which disperses the clamping force through elastic deformation to prevent local stress concentration from damaging the medical feeder 3.

[0046] Furthermore, the pressing component 412 is made of polytetrafluoroethylene polymer material, which has wear-resistant and low-friction properties. Its main structural dimensions are adapted to the base 1 to ensure that it fits the feed surface and applies uniform pressure.

[0047] The elastic element 42 is a spring and is always under compression.

[0048] The spring provides flexible clamping force, which ensures stable feedthrough while avoiding exceeding the yield strength of the medical feedthrough 3-filament material. The spring is covered with a PTFE protective sleeve to reduce metal friction noise and avoid interference with the medical environment.

[0049] This utility model has a simplified structure (no complex electronic components), reduces manufacturing costs by more than 60% compared to traditional tooling, and uses materials such as polytetrafluoroethylene and silicone with strong corrosion resistance and long service life.

[0050] The upper end of the spring is connected to the head of the adjusting rod 44, and the lower end is connected to the interface between the two cavities.

[0051] Furthermore, the interface between the two cavities is designed with a guide slope, which, together with the elastic force of the spring, ensures that the feedthrough falls vertically to the base 1, avoiding lateral tilting that could cause gap measurement deviation.

[0052] The positioning groove 2 passes through the base 1, and the upper surface of the base 1 is flush with it. Figure 2 .

[0053] Furthermore, marble is selected as the material for the base 1, and the lower part of the medical feeder 3 is placed in the positioning groove 2. A feeler gauge is inserted between the upper part of the medical feeder 3 and the upper surface of the base 1 to measure the amount of deformation.

[0054] The deformation of the platinum-iridium alloy wire is indirectly reflected by the gap between the medical feeder 3 and the base 1. The structural deformation value of the feeder can be calculated by inserting a feeler gauge into the maximum size of the gap, avoiding direct contact with the fine wire.

[0055] Preferably, the edge of the marble base 1 is provided with a stepped measuring groove with a depth of 0.5 mm and a width corresponding to the size of the feeler gauge (such as 0.1 mm or 0.2 mm) to guide the feeler gauge to be accurately inserted into the gap.

[0056] The purpose of this design is non-contact measurement. The lower part of the medical feeder 3 is placed in the positioning groove 2, and a feeler gauge is inserted between the upper part of the medical feeder 3 and the upper surface of the base 1. The feeler gauge measurement does not require contact with the fine wire, and the amount of structural deformation is indirectly reflected only by the gap size between the feeder and the base 1.

[0057] Furthermore, using feeler gauge measurement data, the deformation amount ΔL is obtained through the formula:

[0058] ΔL=D max ×cosθ

[0059] Wherein, θ is the tilt angle of the medical feedthrough 3 in the positioning groove, which is measured with the assistance of laser marking on the base 1, automatically correcting the gap deviation caused by gravity in the irregular structure, reducing the measurement error from ±0.05mm to ±0.01mm; D max This represents the maximum size of the gap between the feeler gauge and the inserter.

[0060] A temperature sensor (accuracy ±0.1℃) is pre-embedded inside the base 1 to monitor changes in ambient temperature in real time. Using a thermal expansion coefficient correction formula, the deformation error ΔD of the base 1 caused by temperature fluctuations ΔT is automatically calibrated, ensuring that the measurement accuracy remains ±0.005mm even after high-temperature sterilization (134℃).

[0061] ΔD=α×ΔT×L

[0062] Where α is the coefficient of thermal expansion of base 1, which is 1.2 × 10⁻⁶. -6 / ℃, where L is the original size of the medical feedthrough 3.

[0063] The high-precision mating surfaces of the base 1 and the clamping device 4 ensure the consistency of gap measurements in various parts of the irregular feeder, keeping the measurement error of the irregular structure within ±0.01mm; and the base 1 is made of marble, which can maintain a constant temperature and reduce measurement errors caused by thermal expansion.

[0064] In addition, the base 1 of this utility model can be replaced with a positioning groove 2, which provides customized groove structures (such as a semi-circular groove with a radius of 3mm and a V-shaped groove with an angle of 45°) for serpentine, spiral and irregular feed passages, to ensure that the center of gravity is stable when the feed passage is placed and the gap measurement benchmark is uniform.

[0065] The specific method of using this utility model is as follows:

[0066] Step 1: Tooling Preparation

[0067] Clean the upper surface of the base 1 and the contact end with the lower pressure part 412 to ensure there are no impurities; check the spring's extension and retraction flexibility to confirm there is no jamming.

[0068] Step 2: Placement of Medical Feedthrough 3

[0069] Place the medical feedthrough 3 into the positioning groove 2 of the base 1, ensuring that the gap to be measured in the medical feedthrough 3 is aligned with the edge measurement area of ​​the base 1.

[0070] Step 3: Fix the feedthrough and start temperature compensation

[0071] The adjusting rod 44 is inserted downward into the base 1, the spring is compressed, generating a clamping force, so that the clamping device 4 and the base 1 form a stable clamp.

[0072] Step 4: Feeler gauge measurement

[0073] Select a standard feeler gauge (size range 0.05mm-1mm, accuracy ±0.005mm) and insert it into the gap between the medical feedthrough 3 and the marble base 1. Use a progressive measurement method: start with a smaller feeler gauge and gradually replace it with a larger one until a certain size feeler gauge cannot be fully inserted. Record the size of the feeler gauge that can be fully inserted at the previous level. This size is the gap size between the feedthrough and the base 1.

[0074] Precision control details:

[0075] The machining accuracy of the mating surfaces of the base 1 and the clamping device 4 is controlled at IT7 level to ensure that the structural error of the tooling itself is ≤0.01mm;

[0076] After the spring is installed, the parallelism of the clamping device 4 after being pressed down is ensured by grinding the contact surface between the base 1 and the clamping device 4. The parallelism error is ≤0.005mm, avoiding measurement deviation caused by tooling deformation.

[0077] Temperature compensation mechanism:

[0078] The system automatically reads the current temperature value, calculates the deformation error of base 1 caused by temperature changes based on the preset thermal expansion coefficient formula, and automatically corrects it in subsequent feeler gauge measurement data.

[0079] For example, when the ambient temperature rises from 20℃ to 30℃, the base 1 deforms by 0.00036mm, automatically subtracting 0.00036mm from the feeler gauge measurement value to ensure measurement accuracy in high-temperature environments.

Claims

1. A medical micro-feeder deformation measurement tool, characterized by, The base (1) is provided with a positioning groove (2) on one side of its upper surface, which is matched with the shape of the medical feedthrough (3), and a pressing device (4) is movably connected on the other side; The pressing device (4) comprises a pressing member (41) and an adjusting rod (44); The pressing member (41) comprises a sleeve (411) and a pressing member (412) arranged vertically and in parallel, which are connected by a connecting rod (43); The sleeve (411) is provided with a first cavity and a second cavity from top to bottom, and the first cavity is provided with an elastic member (42); The adjusting rod (44) is screwed on the base (1) after passing through the elastic member (42) and the second cavity; The pressing member (412) can be rotated above the positioning groove (2).

2. The medical micro-feeder deformation measurement tool according to claim 1, wherein, The positioning groove (2) penetrates the base (1).

3. The medical micro-feeder deformation measurement tool according to claim 2, wherein, The upper surface of the base (1) is flush.

4. The medical micro-feeder according to claim 1, wherein, The first cavity and the second cavity are circular holes, and the diameter of the first cavity is larger than that of the second cavity.

5. The medical micro-feeder according to claim 4, wherein, The first cavity and the second cavity are coaxial.

6. The medical micro-feeder according to claim 1, wherein, The lower end of the pressing member (412) is arc-shaped, and the curvature radius of the arc surface is set according to the shape of the medical feedthrough (3).

7. The medical micro-feeder according to claim 6, wherein, The lower end of the pressing member (412) is also inlaid with a silica gel buffer pad.

8. The medical micro-feeder according to claim 1, wherein, The elastic member (42) is a spring, which is always in a compressed state.

9. The medical micro-feeder according to claim 8, wherein, The upper end of the spring is connected to the head of the adjusting rod (44), and the lower end is connected to the interface between the two cavities.

10. The medical micro-feeder according to claim 1, wherein, The height of the adjusting rod (44) is greater than that of the sleeve (411), and the connecting rod (43) is connected to the upper parts of the sleeve (411) and the pressing member (412).

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