Telescopic detection needle and use method thereof

Abstract

The invention provides a telescopic detection needle and a using method thereof. The telescopic detection needle comprises a fixed sleeve, and the fixed sleeve is slidably connected with a movable column in the axis direction; scale grooves are formed in the side surfaces of the movable columns; a connecting seat is arranged at one end of the movable column and is provided with a detection needle; an external socket is arranged at the other end of the movable column; the external socket is electrically connected with the detection needle, and the external socket is used for externally connecting a detection system matched with the detection needle; a protective sleeve is arranged on the side, close to the detection needle, of the fixing sleeve, and an opening is formed in the side, away from the fixing sleeve, of the protective sleeve and used for in-out of the detection needle. Rigid support is provided for the flexible detection needle through the telescopic structure, the extension length and the penetration depth of the detection needle can be accurately controlled in combination with the visual design of the scale groove, meanwhile, the positioning mechanism can fix the position of the movable column, inclination of the penetration direction is avoided, the detection precision and accuracy are effectively improved, and the detection efficiency is improved. The problem that it is difficult for an existing flexible detection needle to accurately control the piercing state is solved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a telescopic detection needle and its method of use. Background Technology

[0002] In living organisms, electric current is conducted by ions. At the electrode-solution interface, it is necessary to convert ionic current into electronic current or vice versa, thus enabling the organism and the instrument system to form a current loop. When the electrode comes into contact with the human body, a potential is generated on the electrode. The electrode essentially converts ions in the human body into flowing electrons in the metal electrode and up to the preamplifier.

[0003] Medical electrodes are mainly divided into detection electrodes and stimulation electrodes. Due to the physical and chemical changes in the body, the distribution of positive and negative charges in different parts of the body is uneven, resulting in different potentials in different parts of the body or inside and outside cells. To measure the potential at different points, electrodes are needed to guide the potential of that point to a potential measuring instrument for measurement.

[0004] Different types of cells have different electrical potentials and frequencies, especially between normal cells and cancerous cells. At present, the use of electrodes to detect diseased cells or tissues, combined with big data intelligent analysis systems for the early detection of lesions, has been increasingly widely applied.

[0005] In the fields of minimally invasive surgery, biological tissue sampling, and other medical and biological testing, flexible detection needles are widely used due to their excellent flexibility, ability to adapt to complex tissue environments, and reduced tissue damage. For example, the flexible detection needle disclosed in patent application number 2023209460043 has the following problems in actual insertion operations due to its flexible nature:

[0006] Because the detection needle is flexible, it is easily affected by tissue resistance when inserted, which makes it impossible to accurately control the insertion depth. This can result in the needle being inserted too deeply and damaging the tissue, or inserted too shallowly and failing to obtain an effective test sample. Furthermore, during the insertion of the flexible detection needle, factors such as hand tremors and uneven tissue resistance can easily cause the insertion direction to deviate from the preset detection position, affecting the accuracy of the detection results. Operators need to spend a lot of time controlling the insertion of the detection needle, which requires a high level of skill and is prone to operational errors, resulting in low detection efficiency.

[0007] In existing technologies, there is a lack of effective auxiliary structures to address the operational issues of flexible detection needles. Some existing technologies use rigid sleeves as auxiliary structures, but rigid sleeves cannot accommodate the bending characteristics of flexible detection needles, limiting their application range. Other auxiliary structures are complex to operate, require additional power devices, are costly, and are not convenient for widespread use in clinical settings. Therefore, a telescopic structure that can provide stable support and precise positioning for flexible detection needles is needed to solve the problem of inconvenient insertion operations with existing flexible detection needles. Summary of the Invention

[0008] The main objective of this invention is to provide a telescopic detection needle and its method of use, thereby solving the problem of inconvenient insertion operation of existing flexible detection needles.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A telescopic detection probe includes a fixed sleeve, and a movable column is slidably connected to the fixed sleeve along the axial direction; The movable column has a graduated groove on its side for observing the sliding distance of the movable column, thereby determining the extension length of the detection probe; One end of the movable column is equipped with a connector, and the connector is equipped with a detection needle; the other end of the movable column is equipped with an external socket; the external socket is electrically connected to the detection needle, and the external socket is used to connect to a detection system that is compatible with the detection needle; The fixed sleeve has a protective sleeve on the side near the detection needle, and the protective sleeve has an opening on the side away from the fixed sleeve. The opening is used for the entry and exit of the detection needle. The protective sleeve can protect the detection needle when it is not in use and prevent the detection needle from being damaged.

[0010] Furthermore, the end of the fixed sleeve is provided with a connecting ring, and the connecting ring is provided with external threads; The inner side of the protective sleeve is provided with internal threads, which are compatible with external threads; The protective sleeve is connected to the fixed sleeve by internal and external threads, which makes it easy to disassemble and install the protective sleeve and facilitates the replacement and maintenance of the detection probe; The connector and the test needle are provided with a matching plug and connector. The test needle and the connector are connected by plug and switch, which facilitates quick replacement of the test needle.

[0011] Furthermore, a positioning mechanism is provided between the movable column and the fixed sleeve to limit the sliding of the movable column relative to the fixed sleeve, thereby fixing the extension length of the detection needle.

[0012] Furthermore, the positioning mechanism includes a first groove located on the side of the movable column; The middle part of the fixed sleeve protrudes circumferentially to form a fixed ring, and the fixed ring is threadedly connected to a first threaded rod. The two ends of the first threaded rod are respectively provided with a first knob and a first fastening block. The first knob is located on the outside of the fixing ring, and the first fastening block is located on the inside of the fixing ring and extends into the inside of the first groove; The contact surfaces of the first fastening block and the first sliding groove are both rough surfaces, which increases the friction to fix the position of the movable column; A handle is located on the side of the movable column away from the detection needle, and an external socket is located on the side of the handle for easy gripping and operation of the movable column.

[0013] Furthermore, the positioning mechanism includes a second sliding groove located on the side of the movable column; A movable ring is slidably connected to the outside of the movable column, and a second threaded rod is threadedly connected to the movable ring. The second threaded rod has a second knob and a second fastening block at both ends. The second knob is located on the outside of the movable ring, and the second fastening block is located on the inside of the movable ring and extends into the inside of the second groove. The contact surfaces of the second fastening block and the second sliding groove are both rough surfaces, which increase the friction to fix the position of the movable ring relative to the movable column, thereby limiting the pushing limit position of the movable column. The outer diameter of the movable ring is larger than the inner diameter of the fixed sleeve, but not larger than the outer diameter of the fixed sleeve, to prevent the movable ring from sliding into the fixed sleeve, thus ensuring that the limit can be completed.

[0014] Furthermore, a propulsion mechanism is provided between the movable column and the fixed sleeve to push the movable column to slide. The propulsion mechanism includes a limiting ring fixed to the outer circumference of the movable column; The movable column is fitted with a first spring, and the limiting ring is located on the side of the first spring closer to the detection needle; The fixed sleeve has a movable cavity, and the limiting ring and the first spring are located in the movable cavity. The first spring is away from the limiting ring and abuts against the inner wall of the movable cavity. The first spring is in a compressed state, and the elastic force of the first spring can push the movable column to slide towards the detection needle side. The fixed sleeve has a movable groove along the axial direction, and the movable groove communicates with the movable cavity; The limiting ring is equipped with a limiting block, which is slidably connected to the inside of the movable groove. The limiting block can slide in the movable groove and at the same time restrict the rotation of the movable column. A handle is provided on the outside of the fixed sleeve, and a second spring is provided inside the handle. A movable block is provided on the side of the second spring near the fixed sleeve. A positioning block is provided on the side of the movable block away from the second spring, and the positioning block extends into the interior of the movable groove; The sides of the positioning block and the limiting block that are close to each other are inclined surfaces, and the sides that are far apart from each other are vertical surfaces and parallel to each other. When the limiting block slides towards the detection needle, it can push the positioning block to slide into the handle. When the limiting block slides to the other side of the positioning block, the positioning block is reset under the elastic force of the second spring, locking the limiting block and restricting the limiting block from sliding in the opposite direction. The movable block has a guide groove on its side, and a guide block is provided inside the guide groove; Both the guide groove and the guide block have inclined surfaces on the side away from the fixed sleeve, and they are in contact with each other; A button is provided on the side of the guide block away from the movable block. The button extends to the outside of the grip. When the button is pressed, the guide block pushes the movable block to slide inward into the grip, causing the positioning block to retract and releasing the restriction on the limiting block. The movable column can slide under the elastic force of the first spring.

[0015] Furthermore, the positioning mechanism is replaced by an electrically controlled drive mechanism for electrically driving the sliding and limiting of the movable column, including: The movable column has an operating groove along its axial direction on its side, and a motor screw is provided along the length of the operating groove. The motor screw is fixed relative to the movable column. The operating slot is equipped with a through-type motor, and the motor lead screw has the lead screw structure of a through-type motor; The through-type motor slides within the operating slot. A connecting block is fixed to the side of the through-type motor, and a fastening screw is provided on the side of the fixing sleeve. The connecting block and the fixing sleeve are fixed by the fastening screw. By rotating the through-type motor, the motor screw can be driven to slide the movable column, thereby realizing the electric control of the sliding of the movable column.

[0016] Furthermore, the connecting seat is separated from the movable column, and several pressure sensors are provided at the end of the movable column near the detection needle; The detection end of the pressure sensor is connected to the connector to detect pressure changes when the detection needle is inserted; Several connecting lines are provided between the connecting seat and the movable column; The detection probe is electrically connected to an external socket via a connecting cable, and the signal from the pressure sensor is also transmitted to the external socket via the connecting cable, and then to the detection system.

[0017] The present invention also provides a method for using the above-mentioned telescopic detection probe, comprising the following steps: S1. Determine the required extension length of the detection probe according to the detection requirements, determine the required sliding distance of the movable column according to the required extension length, observe the sliding distance of the movable column through the scale groove, and ensure that the extension length of the detection probe meets the detection requirements. S2. Align the opening of the protective cover with the location to be detected, and adjust the position of the fixing sleeve so that the detection pin is aligned with the detection location. S3. The movable column slides out the detection needle, and the detection needle pierces the detection position; S4. Move to position. The positioning mechanism limits the position of the movable column, preventing the detection needle from penetrating further and maintaining a stable penetration depth. S5. Once the test is complete, slide the movable column to retract the test needle, and reinstall the protective cover back onto the fixed cover to complete the test.

[0018] Furthermore, the experiment obtained pressure change data at different states when the detection needle was inserted into the skin, and the control group included different insertion states during the insertion process. , , , , , , and ; To ensure the detection needle can be inserted smoothly in the direction of insertion, To detect if the needle deviates from its insertion direction after insertion, with a deviation angle of 0°-5°, To detect if the needle deviates from its insertion direction after insertion, with a deviation angle of 5°-10°, To detect if the needle deviates from its insertion direction after insertion, with a deviation angle of 10°-20°, To detect if the needle deviates from its insertion direction after insertion, with a deviation angle of 20°-30°, To detect if the needle deviates from its insertion direction after insertion, with a deviation angle greater than 30°, The test needle was bent before insertion and failed to penetrate. For other stabbing situations; Based on the experimental data above, an SVM classification model is established.

[0019] S3 includes: S31. During the insertion process, the pressure sensor located in the connecting seat detects pressure data in real time and transmits the pressure data to the detection system; S32. The detection system imports real-time pressure data into the SVM classification model to determine the puncture situation; S33. When the insertion does not meet the design requirements, the detection system sends a signal to stop the insertion. S34. The movable column and detection needle retract to prevent the detection needle from continuing to penetrate and causing damage; S35. The detection system analyzes the reason for the failed insertion and prompts the user to adjust the operation, repeating S1, S2 and S3 until the detection needle is successfully inserted into the detection position.

[0020] This invention provides a telescopic detection probe and its method of use. By adopting the above solution, the following beneficial effects are achieved: The telescopic structure provides rigid support for the flexible detection needle, and the visual design of the scale groove enables precise control of the needle's extension length and insertion depth. At the same time, the positioning mechanism can fix the position of the movable column to prevent the insertion direction from being skewed, effectively improving the accuracy and precision of the detection and solving the problem of the difficulty in accurately controlling the insertion state of existing flexible detection needles.

[0021] It offers three different structural designs: manual positioning, semi-automatic propulsion, and electric control, to meet the needs of different application scenarios: the manual positioning structure is simple to operate and has a low cost, making it suitable for rapid use in emergency situations; the semi-automatic propulsion structure uses spring-assisted propulsion to reduce the labor intensity of operators and is suitable for long-term testing operations; the electric control structure can achieve precise electric control and is suitable for professional testing scenarios with extremely high requirements for penetration accuracy.

[0022] By collecting pressure data in real time during the insertion process using a pressure sensor and combining it with a support vector machine (SVM) classification algorithm, the insertion status of the detection needle can be judged in real time. When abnormalities such as insertion deviation or bending occur, an early warning is issued and insertion is stopped in time to avoid damage to the object being detected. At the same time, it can also protect the detection needle from damage, effectively improving the safety of the detection operation and the service life of the detection needle.

[0023] The probe and connector adopt a plug-in connection, which facilitates quick replacement of probes of different specifications to meet different testing needs; the protective sleeve design can protect the probe when not in use, avoid damage to the probe from the external environment, and extend the service life of the probe; at the same time, the connection between the various structural modules is simple, which facilitates disassembly and maintenance and reduces the cost of use.

[0024] The present invention has a simple structural design and simple operation steps. Operators can master it after simple training, which reduces the skill requirements of operators and facilitates its use in various scenarios such as clinical and laboratory settings, effectively improving the efficiency of testing operations. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the exploded structure of Embodiment 1 of the present invention; Figure 3 This is a top view of Embodiment 1 of the present invention; Figure 4 This is a cross-sectional structural schematic diagram of Embodiment 1 of the present invention; Figure 5 This is a structural schematic diagram of Embodiment 2 of the present invention. Figure 1 ; Figure 6 This is a structural schematic diagram of Embodiment 2 of the present invention. Figure 2 ; Figure 7 This is a top sectional view of Embodiment 2 of the present invention; Figure 8 This is a cross-sectional view of the grip area in Embodiment 2 of the present invention; Figure 9 This is a structural schematic diagram of Embodiment 3 of the present invention. Figure 1 ; Figure 10 This is a structural schematic diagram of Embodiment 3 of the present invention. Figure 2 ; Figure 11 This is a schematic diagram of the exploded structure of Embodiment 3 of the present invention; Figure 12 This is a schematic diagram of the structure of the movable column in Embodiment 3 of the present invention; Figure 13 This is a top sectional view of Embodiment 3 of the present invention.

[0026] In the picture: Fixed sleeve 1, connecting ring 101, movable column 2, scale groove 201, connecting seat 202, handle 203, pressure sensor 204, connecting wire 205, protective sleeve 3, internal thread 301, detection needle 4, external socket 5, positioning mechanism 6, first slide groove 611, fixed ring 612, first knob 613, first threaded rod 614, first fastening block 615, second slide groove 621, movable ring 622, second knob 623, second threaded rod 624, second fastening block 625, pushing mechanism 7, limit ring 701, first spring 702, movable groove 703, limit block 704, grip 705, positioning block 706, movable block 707, guide groove 708, button 709, guide block 710, second spring 711, connecting block 631, fastening screw 632, operating groove 633, through-type motor 634, motor lead screw 635. Detailed Implementation

[0027] Example 1: like Figure 1-4 As shown, this embodiment provides a telescopic detection needle, including a fixed sleeve 1, which is a cylindrical hollow structure. A movable column 2 is slidably connected to the fixed sleeve 1 along the axial direction. The movable column 2 is clearance-fitted with the inner wall of the fixed sleeve 1 and can slide along the axial direction of the fixed sleeve 1.

[0028] The movable column 2 has a scale groove 201 on its side. The scale groove 201 is set along the axial direction of the movable column 2. The scale groove 201 is marked with scale values, which are used to observe the sliding distance of the movable column 2, thereby determining the extension length of the detection needle 4. The accuracy of the scale value is 0.1mm, which facilitates precise control of the extension length of the detection needle 4.

[0029] One end of the movable column 2 is provided with a connecting seat 202, which is integrally formed with the movable column 2. The connecting seat 202 is provided with a detection needle 4, which is preferably a flexible detection needle as described in patent application number 2023209460043, possessing flexibility and adaptability to complex testing environments. The other end of the movable column 2 is provided with an external socket 5, which is preferably a GX12-2P miniature aviation socket, characterized by its small size and stable connection. The external socket 5 is electrically connected to the detection needle 4 and is used to connect an external testing system that matches the detection needle 4. The testing system can obtain the detection signal from the detection needle 4 through the external socket 5.

[0030] A protective sleeve 3 is provided on the side of the fixed sleeve 1 near the detection needle 4. The protective sleeve 3 is a cylindrical hollow structure. An opening is provided on the side of the protective sleeve 3 away from the fixed sleeve 1. The diameter of the opening is slightly larger than the diameter of the detection needle 4. The opening is used for the entry and exit of the detection needle 4. The protective sleeve 3 can protect the detection needle 4 when it is not in use, so as to prevent the detection needle 4 from being damaged.

[0031] The end of the fixed sleeve 1 is provided with a connecting ring 101, which is integrally formed with the fixed sleeve 1. The connecting ring 101 is provided with an external thread with a pitch of 1mm. The inner side of the protective sleeve 3 is provided with an internal thread 301, which is adapted to the external thread. The protective sleeve 3 is connected to the fixed sleeve 1 through the internal thread 301 and the external thread, which facilitates the disassembly and assembly of the protective sleeve 3 and the replacement and maintenance of the detection needle 4.

[0032] The connector 202 and the detection needle 4 are provided with a matching plug and connector. The plug is located on the connector 202 and the connector is located at the end of the detection needle 4. The detection needle 4 and the connector 202 are connected by plug and pull through the plug and connector, which facilitates quick replacement of the detection needle 4 and improves the efficiency of the detection operation.

[0033] A positioning mechanism 6 is provided between the movable column 2 and the fixed sleeve 1 to limit the sliding of the movable column 2 relative to the fixed sleeve 1, thereby fixing the extension length of the detection needle 4. The positioning mechanism 6 includes a first slide groove 611 provided on the side of the movable column 2. The first slide groove 611 is arranged along the axial direction of the movable column 2, and the cross-section of the first slide groove 611 is rectangular.

[0034] A retaining ring 612 is formed by a circumferential protrusion in the middle of the retaining sleeve 1. The retaining ring 612 is integrally formed with the retaining sleeve 1. The retaining ring 612 is threadedly connected to a first threaded rod 614 with a thread pitch of 1 mm. The two ends of the first threaded rod 614 are respectively provided with a first knob 613 and a first fastening block 615. The first knob 613 is integrally formed with the first threaded rod 614. The side of the first knob 613 is provided with anti-slip texture to facilitate rotation of the first knob 613. The first fastening block 615 is fixedly connected to the first threaded rod 614. The first fastening block 615 is made of rubber and has a certain degree of elasticity.

[0035] The first knob 613 is located outside the fixing ring 612, and the first fastening block 615 is located inside the fixing ring 612 and extends into the first slide groove 611. The contact surfaces of the first fastening block 615 and the first slide groove 611 are both rough surfaces with a roughness of Ra3.2, which increases the friction to fix the position of the movable column 2.

[0036] A handle 203 is provided on the side of the movable column 2 away from the detection needle 4. The handle 203 is integrally formed with the movable column 2, and the side of the handle 203 has anti-slip texture for easy gripping and operation of the movable column 2. An external socket 5 is located on the side of the handle 203 for easy connection to an external detection system.

[0037] The working principle of this embodiment is as follows: In use, first hold the handle 203 and slide the movable column 2 to extend the detection needle 4 out of the protective sleeve 3. Observe the sliding distance of the movable column 2 through the scale groove 201. After confirming that the extension length of the detection needle 4 meets the detection requirements, rotate the first knob 613. The first knob 613 drives the first threaded rod 614 to rotate, and the first threaded rod 614 pushes the first fastening block 615 to move towards one side of the first slide groove 611, so that the first fastening block 615 abuts against the inner wall of the first slide groove 611. The position of the movable column 2 is fixed by the friction of the rough surface, thereby fixing the extension length of the detection needle 4. Then, align the detection needle 4 with the position to be detected, push the fixing sleeve 1, and let the detection needle 4 pierce the detection position. The detection system obtains the detection signal of the detection needle 4 through the external socket 5 to complete the detection. After the test is completed, rotate the first knob 613 in the opposite direction to loosen the first fastening block 615 from the first slide groove 611, slide the movable column 2 to retract the test needle 4 into the protective sleeve 3, and then screw the protective sleeve 3 back onto the fixed sleeve 1 to complete the test operation.

[0038] Example 2: like Figure 5-8 As shown, this embodiment provides a telescopic detection needle, which differs from Embodiment 1 in that the positioning mechanism 6 and the propulsion mechanism 7 have different structures.

[0039] The positioning mechanism 6 includes a second slide groove 621 located on the side of the movable column 2. The second slide groove 621 is arranged along the axial direction of the movable column 2 and has a rectangular cross-section.

[0040] A movable ring 622 is slidably connected to the outer side of the movable column 2. The movable ring 622 is clearance-fitted with the outer wall of the movable column 2 and can slide along the axial direction of the movable column 2. The movable ring 622 is threadedly connected to a second threaded rod 624 with a thread pitch of 1mm. A second knob 623 and a second fastening block 625 are respectively provided at both ends of the second threaded rod 624. The second knob 623 is integrally formed with the second threaded rod 624, and the side of the second knob 623 has anti-slip textures for easy rotation. The second fastening block 625 is fixedly connected to the second threaded rod 624 and is made of rubber, possessing a certain degree of elasticity.

[0041] The second knob 623 is located outside the movable ring 622, and the second fastening block 625 is located inside the movable ring 622 and extends into the interior of the second slide groove 621. The contact surfaces of the second fastening block 625 and the second slide groove 621 are both rough surfaces with a roughness of Ra3.2, which increases the friction to fix the position of the movable column 2.

[0042] The outer diameter of the movable ring 622 is larger than the inner diameter of the fixed sleeve 1, but not larger than the outer diameter of the fixed sleeve 1, so as to prevent the movable ring 622 from sliding into the fixed sleeve 1. At the same time, the movable ring 622 can abut against the end of the fixed sleeve 1 to limit the sliding distance of the movable column 2.

[0043] A propulsion mechanism 7 is provided between the movable column 2 and the fixed sleeve 1 to push the movable column 2 to slide. The propulsion mechanism 7 includes a limiting ring 701 fixed to the outer circumference of the movable column 2, and the limiting ring 701 is integrally formed with the movable column 2.

[0044] The movable column 2 is fitted with a first spring 702, which is a compression spring with an elastic coefficient of 10 N / mm. The limiting ring 701 is located on the side of the first spring 702 closer to the detection needle 4. The fixed sleeve 1 has a movable cavity, which is a cylindrical hollow structure. The limiting ring 701 and the first spring 702 are located inside the movable cavity. The first spring 702 is away from the limiting ring 701 and abuts against the inner wall of the movable cavity. The first spring 702 is in a compressed state, and the elastic force of the first spring 702 can push the movable column 2 to slide towards the detection needle 4.

[0045] The fixed sleeve 1 has an axially oriented movable groove 703 that communicates with the movable cavity. The movable groove 703 has a rectangular cross-section. The limiting ring 701 has a limiting block 704, which is integrally formed with the limiting ring 701. The limiting block 704 is slidably connected to the inside of the movable groove 703. The limiting block 704 can slide within the movable groove 703 and simultaneously restricts the rotation of the movable column 2, preventing the movable column 2 from rotating during sliding.

[0046] A handle 705 is provided on the outer side of the fixed sleeve 1. The handle 705 is integrally formed with the fixed sleeve 1. The side of the handle 705 is provided with anti-slip texture for easy gripping. A second spring 711 is provided inside the handle 705. The second spring 711 is a compression spring with an elastic coefficient of 5N / mm. A movable block 707 is provided on the side of the second spring 711 near the fixed sleeve 1. The movable block 707 is clearance-fitted with the inner wall of the handle 705 and can slide along the axial direction of the handle 705.

[0047] A positioning block 706 is provided on the side of the movable block 707 away from the second spring 711. The positioning block 706 is integrally formed with the movable block 707 and extends into the interior of the movable groove 703. The sides of the positioning block 706 and the limiting block 704 that are close to each other are inclined surfaces with an inclination angle of 45°. The sides that are far from each other are vertical surfaces and parallel to each other. When the movable column 2 is pulled down, causing the limiting block 704 to slide towards the detection needle 4, the limiting block 704 contacts the positioning block 706. Then, if the movement continues, it can push the positioning block 706 to slide into the handle 705. When the limiting block 704 slides to the other side of the positioning block 706, the positioning block 706 returns to its original position under the elastic force of the second spring 711, locking the limiting block 704 and restricting the limiting block 704 from sliding in the opposite direction.

[0048] The movable block 707 has a guide groove 708 on its side. The guide groove 708 has a trapezoidal cross-section, and a guide block 710 is provided inside the guide groove 708. The guide block 710 is adapted to the shape of the guide groove 708. The sides of the guide groove 708 and the guide block 710 away from the fixed sleeve 1 are both inclined surfaces with an inclination angle of 45°, and they are in contact with each other. A button 709 is provided on the side of the guide block 710 away from the movable block 707. The button 709 is integrally formed with the guide block 710 and extends to the outside of the grip 705 for easy pressing.

[0049] The working principle of this embodiment is as follows: When in use, first slide the movable ring 622 to move it to the design scale, then turn the second knob 623 to drive the second threaded rod 624 to rotate, so that the second threaded rod 624 moves and drives the second fastening block 625 to move, so that the second fastening block 625 is in close contact with the second sliding groove 621, thus completing the fixation of the movable ring 622 and the movable column 2. Then, hold the handle 705, align the opening of the protective cover 3 with the detection position, and press the button 709. The button 709 drives the guide block 710 to slide into the handle 705. The guide block 710 pushes the movable block 707 to slide into the handle 705 through the guide groove 708. The movable block 707 drives the positioning block 706 to retract, releasing the restriction on the limit block 704.

[0050] At this time, the elastic force of the first spring 702 pushes the movable column 2 to slide towards the detection needle 4, causing the detection needle 4 to extend out of the protective sleeve 3, and then insert into the detection position to complete the detection.

[0051] After the test is completed, pull the movable column 2 to retract the test needle 4 into the protective sleeve 3. Continue to move the limit block 704 to contact the positioning block 706. Then, push the positioning block 706 to slide into the handle 705. When the limit block 704 slides to the other side of the positioning block 706, the positioning block 706 resets under the elastic force of the second spring 711, locking the limit block 704 and restricting the limit block 704 from sliding in the opposite direction; thus, the test is completed.

[0052] Example 3: like Figure 9-13 As shown, this embodiment provides a telescopic detection needle, which differs from Embodiment 1 in that the positioning mechanism 6 is an electrically controlled drive mechanism.

[0053] The positioning mechanism 6 is replaced by an electrically controlled drive mechanism for electrically driving the sliding and limiting of the movable column 2. It includes: an operating groove 633 along the axial direction on the side of the movable column 2, the operating groove 633 being rectangular in cross-section; and a motor lead screw 635 along the length of the operating groove 633, which is fixed relative to the movable column 2. The lead screw 635 has a pitch of 0.5 mm.

[0054] The operating slot 633 houses a through-type motor 634, preferably a Handebao 20N228 model through-type lead screw motor. This motor has a step angle of 1.8°, a rated current of 0.5A, and features small size and high torque. The motor lead screw 635 is the lead screw structure of the through-type motor 634. The rotation of the through-type motor 634 drives the motor lead screw 635 to slide the movable column 2.

[0055] The through-type motor 634 slides within the operating slot 633. A connecting block 631 is fixed to the side of the through-type motor 634, and the connecting block 631 is fixedly connected to the through-type motor 634 by bolts. The side of the fixing sleeve 1 is provided with fastening screws 632, and the connecting block 631 is fixed to the fixing sleeve 1 by fastening screws 632, thereby fixing the through-type motor 634 to the fixing sleeve 1.

[0056] The working principle of this embodiment is as follows: In use, the through-type motor 634 is controlled to rotate by an external detection system. The rotation of the through-type motor 634 drives the motor screw 635 to slide the movable column 2, so that the detection needle 4 extends out of the protective sleeve 3. The sliding distance of the movable column 2 is observed through the scale groove 201. When the extension length of the detection needle 4 meets the detection requirements, the through-type motor 634 is controlled to stop rotating. The self-locking function of the through-type motor 634 can fix the position of the movable column 2, thereby fixing the extension length of the detection needle 4.

[0057] Then, the detection needle 4 is aligned with the position to be detected, and the fixing sleeve 1 is pushed so that the detection needle 4 penetrates the detection position. The detection system obtains the detection signal of the detection needle 4 through the external socket 5 to complete the detection. After the detection is completed, the through-type motor 634 is controlled to rotate in the reverse direction, driving the movable column 2 to slide in the reverse direction, retracting the detection needle 4 into the protective sleeve 3. Then, the protective sleeve 3 is screwed back onto the fixing sleeve 1 to complete the detection operation.

[0058] Alternatively, the opening of the protective sleeve 3 can be aligned with the location to be detected, and then the through-type motor 634 can be started to drive the detection needle 4 to directly pierce the detection location. The protective sleeve 3 can limit the probability of the detection needle 4 bending.

[0059] Preferably, a control button and a display screen can be provided on the fixed sleeve 1 for near-end control of the start and stop of the through motor 634, and the data can be displayed on the display screen. The specific wiring connection can adopt the conventional connection method of the existing technology. The power supply for this application is provided through an external detection system or control device connected to the external socket 5.

[0060] Examples 1, 2, and 3 can all be configured with the following structures as needed: The connecting seat 202 is separated from the movable column 2. Several pressure sensors 204 are provided at one end of the movable column 2 near the detection needle 4. The pressure sensors 204 are preferably miniature invasive pressure sensors from TEConnectivity's IntraSense series. The measurement range of this sensor is -300mmHg to +500mmHg, the accuracy is ±2mmHg, and it is small in size and suitable for installation at the end of the movable column 2.

[0061] The detection end of the pressure sensor 204 is connected to the connector 202 to detect the pressure change when the detection needle 4 is inserted. The detection signal of the pressure sensor 204 can be transmitted to an external detection system to determine the insertion state of the detection needle 4.

[0062] Several connecting wires 205 are provided between the connecting base 202 and the movable column 2. The connecting wires 205 are shielded to reduce signal interference. The detection needle 4 is electrically connected to the external socket 5 through the connecting wires 205. The signal from the pressure sensor 204 is also transmitted to the external socket 5 through the connecting wires 205, and then to the detection system.

[0063] Example 4: This embodiment provides a method for using the above-mentioned telescopic detection probe, including the following steps: S1. Determine the required extension length of the detection needle 4 according to the detection requirements, determine the required sliding distance of the movable column 2 according to the required extension length, and determine the sliding distance of the movable column 2 through the scale value of the scale groove 201 to ensure that the extension length of the detection needle 4 meets the detection requirements.

[0064] S2. Align the opening of the protective sleeve 3 with the position to be detected, adjust the position of the fixing sleeve 1 so that the detection needle 4 is aligned with the detection position, and ensure that the insertion direction of the detection needle 4 is correct.

[0065] S3. The sliding column 2 pushes out the detection needle 4, and the detection needle 4 inserts into the detection position: S3 includes: S31. During the insertion process, the pressure sensor 204 located in the connecting seat 202 detects the pressure data in real time and transmits the pressure data to the detection system. The sampling frequency of the pressure sensor 204 is 100Hz, which can acquire pressure change data in real time.

[0066] S32. The detection system extracts feature parameters from real-time pressure data, inputs them into a trained SVM classification model, determines the puncture state, and the model outputs the classification result. - One of them.

[0067] S33. When the insertion situation does not meet the design requirements (e.g., the preset classification result is...) - (The specific settings are based on actual usage requirements; this application only uses this as an example.) When the needle 4 continues to penetrate, the detection system sends a signal to stop the insertion, thus preventing damage and affecting the experimental results.

[0068] S34, the movable column 2 and the detection needle 4 retract, and the detection needle 4 is retracted into the protective sleeve 3 to prevent the detection needle 4 from being further damaged.

[0069] S35. The detection system analyzes the reasons for the insertion failure based on the classification results output by the model and prompts the user to adjust the operation: When the classification result is - When this happens, the user is prompted to readjust the position of the fixing sleeve 1, with the adjustment angle being 20°-30°; When the classification result is When this happens, the user is prompted to reposition the detection location and adjust the insertion direction; When the classification result is When this happens, the system prompts the user to check or replace the test needle 4; When the classification result is When prompted, the user will be asked to check the status of probe 4 or the device, depending on the actual settings. It depends on the parameters.

[0070] Repeat steps S1, S2, and S3 until the detection needle 4 successfully penetrates the detection position, at which point the classification result is obtained. .

[0071] S4. Move to position. The position of the movable column 2 is limited by the positioning mechanism 6, so that the detection needle 4 stops penetrating and the penetration depth of the detection needle 4 is kept stable to ensure the stability of the detection.

[0072] S5. The test is complete. The sliding column 2 retracts the test needle 4, and the protective sleeve 3 is installed back onto the fixed sleeve 1 to complete the test.

[0073] The training steps for the SVM classification model include: S61. Collect pressure data at different insertion states: Collect data at different insertion states. - The pressure time series data was collected, with 100 samples per state, each sample containing 100 pressure data points, a sampling frequency of 100Hz, and a sampling time of 1s. To ensure the detection needle 4 can be smoothly inserted in the insertion direction. To detect if the insertion direction of needle 4 is deviated after insertion, with a deviation angle of 0°-5°, To detect if the insertion direction of needle 4 is deviated after insertion, with a deviation angle of 5°-10°, To detect if the insertion direction of needle 4 is deviated after insertion, with a deviation angle of 10°-20°, To detect if the insertion direction of needle 4 is deviated after insertion, with a deviation angle of 20°-30°, To detect if the insertion direction of needle 4 is deviated after insertion, with a deviation angle greater than 30°, The detection needle 4 bent before insertion and failed to penetrate. For other insertion scenarios, the specific settings should be configured according to the actual situation encountered.

[0074] S62. Extract pressure feature parameters: Extract the following feature parameters for each group of samples: Mean pressure: ,in, Let be the i-th pressure data point, and n be the number of sample data points.

[0075] Pressure variance: This is used to reflect the dispersion of pressure data.

[0076] Maximum pressure change rate: ,in and They are respectively and The pressure value at any moment, .

[0077] Peak pressure: , which is the maximum pressure value in the sample.

[0078] S63. Training the SVM classification model: Divide the feature data into a training set and a test set, with the training set accounting for 80% and the test set accounting for 20%. Use the training set to train the Support Vector Machine (SVM) classification model, selecting the radial basis function as the kernel function. ; in The kernel function parameter is 0.1, and its optimal value was determined through cross-validation. The model's classification decision function is: ; in For Lagrange multipliers, 'b' represents the sample label, and 'b' represents the bias term.

[0079] S64. Verify model accuracy: Use the test set to verify the classification accuracy of the model. When the accuracy reaches 95% or higher, the model training is complete, and the model is stored in the detection system.

[0080] During the training process, since the experiment uses pressure time series data, that is, data when different insertion times are inserted to different depths, in actual use, the data in the model is matched according to the actual insertion time and depth. Example 4 preferably adopts the structure of Example 3. During the insertion process, the insertion depth is determined by the motor speed, and the time changes in real time.

[0081] This invention provides support and positioning for the flexible detection needle through a telescopic structure, facilitating control of the insertion depth and direction. This solves the problem of inconvenient insertion operations with existing flexible detection needles, improving the convenience and accuracy of the detection process. Simultaneously, a pressure sensor monitors pressure changes in real time during insertion, allowing for assessment of the insertion status and timely adjustments to the operation, preventing damage to the detection needle and enhancing the safety of the detection process.

[0082] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A telescopic detection probe, characterized in that: Includes a fixed sleeve (1), and the fixed sleeve (1) is slidably connected to a movable column (2) along the axial direction; The movable column (2) has a scale groove (201) on its side; One end of the movable column (2) is provided with a connecting seat (202), and the connecting seat (202) is provided with a detection needle (4); the other end of the movable column (2) is provided with an external socket (5); the external socket (5) is electrically connected to the detection needle (4); the external socket (5) is used to connect an external detection system that matches the detection needle (4); The fixed sleeve (1) has a protective sleeve (3) on the side close to the detection needle (4), and the protective sleeve (3) has an opening on the side away from the fixed sleeve (1), which is used for the entry and exit of the detection needle (4).

2. The telescopic detection needle according to claim 1, characterized in that: The end of the fixed sleeve (1) is provided with a connecting ring (101), and the connecting ring (101) is provided with external threads; The inner side of the protective sleeve (3) is provided with an internal thread (301), which is compatible with the external thread; The protective sleeve (3) is connected to the fixed sleeve (1) by the internal thread (301) and the external thread; The connector (202) is provided with a matching plug and connector between the detection pins (4). The detection pins (4) and the connector (202) are connected by plug and pull through the plug and connector.

3. The telescopic detection needle according to claim 1, characterized in that: A positioning mechanism (6) is provided between the movable column (2) and the fixed sleeve (1) to limit the sliding of the movable column (2) relative to the fixed sleeve (1).

4. A telescopic detection needle according to claim 3, characterized in that: The positioning mechanism (6) includes a first groove (611) located on the side of the movable column (2); The middle part of the fixing sleeve (1) protrudes in the circumferential direction to form a fixing ring (612). The fixing ring (612) is threadedly connected to a first threaded rod (614). The two ends of the first threaded rod (614) are respectively provided with a first knob (613) and a first fastening block (615). The first knob (613) is located outside the fixing ring (612), and the first fastening block (615) is located inside the fixing ring (612) and extends into the first groove (611); The contact surfaces of the first fastening block (615) and the first sliding groove (611) are both rough surfaces; A handle (203) is provided on the side of the movable column (2) away from the detection needle (4), and an external socket (5) is provided on the side of the handle (203).

5. A telescopic detection needle according to claim 3, characterized in that: The positioning mechanism (6) includes a second slide groove (621) located on the side of the movable column (2); The movable column (2) is slidably connected to a movable ring (622), and the movable ring (622) is threadedly connected to a second threaded rod (624). The second threaded rod (624) has a second knob (623) and a second fastening block (625) at both ends. The second knob (623) is located outside the movable ring (622), and the second fastening block (625) is located inside the movable ring (622) and extends into the interior of the second slide groove (621). The contact surfaces of the second fastening block (625) and the second slide groove (621) are both rough surfaces; The outer diameter of the movable ring (622) is greater than the inner diameter of the fixed sleeve (1), but not greater than the outer diameter of the fixed sleeve (1).

6. A telescopic detection needle according to claim 5, characterized in that: A propulsion mechanism (7) is provided between the movable column (2) and the fixed sleeve (1) to push the movable column (2) to slide; The propulsion mechanism (7) includes a limiting ring (701) fixed to the outer periphery of the movable column (2); The movable column (2) is fitted with a first spring (702), and the limiting ring (701) is located on the side of the first spring (702) closer to the detection needle (4); The fixed sleeve (1) has a movable cavity, the limiting ring (701) and the first spring (702) are located in the movable cavity, the first spring (702) is away from the limiting ring (701) and abuts against the inner wall of the movable cavity, and the first spring (702) is in a compressed state; The fixed sleeve (1) is provided with a movable groove (703) along the axial direction, and the movable groove (703) is connected to the movable cavity; The limiting ring (701) is provided with a limiting block (704), which is slidably connected to the inside of the movable groove (703); A handle (705) is provided on the outside of the fixed sleeve (1), and a second spring (711) is provided inside the handle (705). A movable block (707) is provided on the side of the second spring (711) near the fixed sleeve (1). A positioning block (706) is provided on the side of the movable block (707) away from the second spring (711), and the positioning block (706) extends into the interior of the movable groove (703); The positioning block (706) and the limiting block (704) are inclined surfaces on the side that are close to each other, and vertical surfaces that are far apart from each other and are parallel to each other; The movable block (707) has a guide groove (708) on its side, and a guide block (710) is provided inside the guide groove (708); The guide groove (708) and the guide block (710) are both inclined surfaces on the side away from the fixed sleeve (1) and are in contact with each other; A button (709) is provided on the side of the guide block (710) away from the movable block (707), and the button (709) extends to the outside of the grip (705).

7. A telescopic detection needle according to claim 3, characterized in that: The positioning mechanism (6) is replaced by an electrically controlled drive mechanism for electrically driving the movable column (2) to slide and limit, including: The movable column (2) has an operating groove (633) along its axial direction on its side. The operating groove (633) has a motor screw (635) along its length direction. The motor screw (635) is fixed relative to the movable column (2). The operating slot (633) is equipped with a through-type motor (634), and the motor lead screw (635) is the lead screw structure of the through-type motor (634); The through-type motor (634) slides within the operating slot (633). A connecting block (631) is fixed on the side of the through-type motor (634), and a fastening screw (632) is provided on the side of the fixing sleeve (1). The connecting block (631) and the fixing sleeve (1) are fixed by the fastening screw (632).

8. A telescopic detection probe according to any one of claims 1-7, characterized in that: The connecting seat (202) is separated from the movable column (2). Several pressure sensors (204) are provided at one end of the movable column (2) near the detection needle (4). The detection end of the pressure sensor (204) is connected to the connecting seat (202). Several connecting lines (205) are provided between the connecting seat (202) and the movable column (2); The detection probe (4) is electrically connected to the external socket (5) via the connecting wire (205).

9. A method of using the telescopic detection probe according to any one of claims 1-8, characterized in that: Includes the following steps: S1. Determine the required extension length of the detection probe (4) based on the detection requirements, and determine the required sliding distance of the movable column (2) based on the required extension length. S2. Align the opening of the protective cover (3) with the location to be detected; S3, the movable column (2) slides to push out the detection needle (4), and the detection needle (4) pierces the detection position; S4. Moved into position and limited by the positioning mechanism (6), the detection needle (4) no longer inserts; S5. Detection complete. Slide the movable column (2) to retract the detection needle (4) and complete the detection.

10. The method of using a telescopic detection probe according to claim 9, characterized in that: The experiment obtained pressure change data of the test needle (4) when it was inserted into the skin at different states. The control group included different insertion states during the insertion process. , , , , , , and ; To ensure the detection needle (4) is inserted smoothly in the insertion direction, To detect if the insertion direction of the needle (4) is skewed after insertion, with a skew angle of 0°-5°, To detect if the insertion direction of the needle (4) is skewed after insertion, with a skew angle of 5°-10°, To detect if the insertion direction of the needle (4) is skewed after insertion, with a skew angle of 10°-20°, To detect if the insertion direction of the needle (4) is skewed after insertion, with a skew angle of 20°-30°, To detect if the insertion direction of the needle (4) is skewed after insertion, and the skew angle is greater than 30°, The detection needle (4) bent before insertion and failed to penetrate. For other stabbing situations; Based on the experimental data above, an SVM classification model is established; S3 includes: S31. During the insertion process, the sensor located at the connecting seat (202) detects the pressure data in real time; S32. Import pressure data into the SVM classification model to determine the puncture situation; S33. If the insertion does not meet the design requirements, stop insertion; S34, the movable column (2) and the detection needle (4) retract; S35. Determine the reason for the failed insertion, and repeat S1, S2 and S3.

Images