Fixing device for preventing slippage of dialysis indwelling needle

Abstract

The utility model discloses a kind of fixing device for preventing dialysis indwelling needle from slipping, including dialysis indwelling needle and extracorporeal circulation blood vessel, one end of the dialysis indwelling needle is fixed with indwelling needle connector, one end of the extracorporeal circulation blood vessel is fixed with circulation blood vessel connector, the outer end of the indwelling needle connector and circulation blood vessel connector is fixed with a fixator, the fixator one end is connected with indwelling needle connector sleeve through sealing rubber washer, the fixator other end is connected with the outer end hose of circulation blood vessel connector closely through elastic buckle, the elastic buckle inside of the fixator is evenly embedded with several optical fiber sensors, miniature MEMS accelerometer, microprocessor, speaker, wireless signal transmission module are installed in fixator inside, electrical connection is carried out between each element through PCB board.

Description

Technical Field

[0001] This utility model relates to the medical field, specifically a fixation device to prevent dialysis indwelling needles from slipping out. Background Technology

[0002] In hemodialysis treatment, the stability of the connection between the dialysis catheter and the extracorporeal circulation vessel is crucial. However, current dialysis catheters present numerous problems in use, seriously affecting the safety and effectiveness of dialysis treatment. Traditional methods of fixing dialysis catheters are relatively simple, often relying on medical adhesive tape. However, this method has significant shortcomings in actual clinical application. On the one hand, patients inevitably move their limbs during dialysis, which can easily cause traction on the connection between the catheter and the extracorporeal circulation vessel. The adhesive tape has limited stickiness and cannot effectively resist significant external forces, making the connection prone to loosening or even causing the catheter to slip out. Once slippage occurs, it not only interrupts dialysis treatment, causing pain to the patient, but may also lead to a series of complications such as bleeding and infection, seriously threatening the patient's health. On the other hand, existing fixing methods do not adequately guarantee the seal at the connection. During dialysis, the fluid pressure inside the extracorporeal circulation vessel is high; if the connection is not properly sealed, fluid leakage is likely to occur. This not only wastes medical resources but may also contaminate the patient's clothing and bedding, increasing patient discomfort and the workload of nursing staff. Meanwhile, fluid leakage can also cause local skin problems such as redness, swelling, and ulceration, further affecting the patient's treatment experience and recovery process. Furthermore, current monitoring methods for abnormal traction and slippage risk of dialysis indwelling needles are relatively lacking. Medical staff can usually only observe the status of the indwelling needle through regular rounds, but this method has a significant time lag. If an abnormality occurs between rounds, medical staff may not be able to detect it in time and take timely measures, thus delaying treatment. In some special circumstances, such as when patients are sleeping at night or when there are many patients in the dialysis room and medical staff are busy, this risk is further increased. In summary, existing methods of fixing and monitoring dialysis indwelling needles have many drawbacks and cannot meet the clinical needs for the safety and stability of dialysis treatment. Developing a fixation device that can effectively prevent dialysis indwelling needle slippage, ensure the sealing of the connection, and monitor abnormal traction in real time is of significant practical importance. Summary of the Invention

[0003] To achieve the above objectives, this utility model provides the following technical solution:

[0004] A fixation device for preventing slippage of a dialysis indwelling needle includes a dialysis indwelling needle and an extracorporeal circulation vessel. One end of the dialysis indwelling needle is fixedly provided with an indwelling needle connector, and one end of the extracorporeal circulation vessel is fixedly provided with a circulation vessel connector. A fixator is fixedly sleeved on the outer ends of the indwelling needle connector and the circulation vessel connector. One end of the fixator is sleeved with the indwelling needle connector through a sealing rubber gasket, and the other end of the fixator is tightly connected to the outer end of the circulation vessel connector through an elastic buckle. Several fiber optic sensors are uniformly embedded inside the elastic buckle of the fixator. A miniature MEMS accelerometer, a microprocessor, a speaker, and a wireless signal transmission module are installed inside the fixator. The components are electrically connected to each other through a PCB board.

[0005] Furthermore, the elastic buckle consists of two symmetrical arc-shaped buckles. One end of the arc-shaped buckle is connected to the inner wall of the retainer through a pivot. The arc-shaped buckle can rotate around the pivot to achieve the opening and closing action. The inner wall of the arc-shaped buckle groove is provided with anti-slip texture.

[0006] Furthermore, the MEMS accelerometer is the STMicroelectronics LIS3DH triaxial accelerometer.

[0007] Furthermore, the microprocessor is an STM32F103C8T6 microcontroller.

[0008] Furthermore, the speaker is a TDK PS1240P02BT model speaker.

[0009] Furthermore, the wireless signal transmission module is the Nordic Semiconductor nRF24L01 wireless module.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] The reinforced connection points, achieved through a flexible snap-fit ​​structure and sealing rubber gaskets, significantly reduce the risks of loosening, slippage, and fluid leakage at the connection points caused by accidental traction during dialysis catheterization and extracorporeal circulation blood vessels, thus improving the safety and stability of the entire dialysis process. The combination of fiber optic sensors and MEMS accelerometers enables more comprehensive and accurate sensing of traction in different directions and to varying degrees, avoiding misjudgments or omissions that may occur with single detection methods. This improves the accuracy of identifying abnormal traction behavior, leading to more timely and effective alarm triggering. The wireless signal transmission module ensures that medical staff receive alarm information promptly regardless of their location (even when not near the dialysis equipment), preventing missed opportunities for intervention. Combined with the optimized audible alarm function, this further enhances the practicality and reliability of the entire device in real-world medical environments, ensuring the smooth progress of dialysis treatment for patients. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this application;

[0013] Figure 2 This is a schematic diagram of the elastic snap-fit ​​structure of this application.

[0014] In the diagram, 1. Dialysis indwelling needle, 2. Extracorporeal circulation blood vessel, 3. Fixator, 4. Elastic buckle structure, 41. Arc-shaped buckle, 42. Anti-slip texture, 5. Sealing rubber gasket, 6. Indwelling needle connector, 7. Circulatory blood vessel connector, 8. PCB board, 9. Speaker. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] This application provides a fixing device to prevent slippage of a dialysis indwelling needle, such as... Figures 1-2 As shown, the device includes a dialysis indwelling needle 1 and an extracorporeal circulation vessel 2. One end of the dialysis indwelling needle 1 is fixed with an indwelling needle connector 6, and one end of the extracorporeal circulation vessel 2 is fixed with a circulation vessel connector 7. A retainer 3 is detachably fitted onto the outer ends of the indwelling needle connector 6 and the circulation vessel connector 7. One end of the retainer 3 is fitted onto the indwelling needle connector 6 through a sealing rubber gasket 5, and the other end of the retainer 3 is tightly connected to the outer end of the circulation vessel connector 7 through an elastic buckle structure 4. Several fiber optic sensors are uniformly embedded inside the elastic buckle structure 4 of the retainer 3. A miniature MEMS accelerometer, a microprocessor, a speaker 9, and a wireless signal transmission module are installed inside the retainer 3. All components are electrically connected through a PCB board 8.

[0017] The fixator 3 is integrally molded from a new type of medical polymer material. Its internal space accommodates and fixes fiber optic sensors, MEMS accelerometers, microprocessors, wireless signal transmission modules, and power supply components. These components are reliably electrically connected via printed circuit boards (PCBs). The fixator 3 and the indwelling needle connector 6 are connected by a sealing rubber gasket 5. The outer wall of the indwelling needle connector 6 has a surrounding groove, and the sealing rubber gasket 5 has an annular protrusion that fits into the corresponding groove of the indwelling needle connector 6, enhancing the stability and sealing of the connection. The sealing rubber gasket 5 is installed at the connection point between the fixator 3 and the indwelling needle connector 6. The annular protrusion inside the gasket precisely matches the corresponding groove of the indwelling needle connector 6. Its material has good elasticity, sealing properties, and corrosion resistance, effectively preventing loosening of the connection and fluid leakage. Fiber optic sensors are evenly distributed inside the elastic buckle structure 4 of the fixator 3, arranged at certain intervals along the length and width of the elastic buckle structure 4. These sensors can detect minute deformations of the elastic buckle structure 4 in all directions in real time and convert the deformation information into changes in optical signals. These optical signals are then transmitted to a microprocessor for analysis and processing via an optical fiber transmission line. The elastic buckle structure 4 is made of medical-grade, soft, and elastic plastic. The buckle has an arc-shaped groove inside that conforms to the shape of the dialysis indwelling needle 1 tubing. The inner wall of the groove has fine anti-slip textures 42, allowing it to fit tightly against the tubing surface. The elastic buckle structure 4 consists of two symmetrical arc-shaped buckles 41. One end of each buckle is connected to the fixator 3 via a pivot, allowing it to rotate around the pivot to open and close. The inner wall of the arc-shaped groove of the buckle has fine anti-slip textures 42, and the material is soft and elastic medical-grade plastic. It fits tightly against the surface of the dialysis indwelling needle 1 tubing, maintaining a closed state through the buckle's own elasticity and preventing the tubing from slipping out. When the fixator 3 is installed, it is fitted onto the outer ends of the indwelling needle connector 6 and the circulatory blood vessel connector 7. The flexible tube at the end of the circulatory blood vessel connector 7 is aligned with the arc-shaped groove of the elastic buckle structure 4. The buckle is gently pressed, and its elasticity is used to lock it onto the flexible tube. The anti-slip texture 42 further prevents the flexible tube from easily slipping off when subjected to external force. The annular protrusion of the sealing rubber gasket 5 cooperates with the groove of the circulatory blood vessel connector 7 to prevent loosening of the connection and to avoid liquid leakage at the connection point, ensuring a safe and reliable connection between the extracorporeal circulation blood vessel 2 and the dialysis indwelling needle 1. Multiple fiber optic sensors are evenly embedded inside the elastic buckle structure 4 of the fixator 3. These fiber optic sensors can detect the minute deformations of the elastic buckle structure 4 in different directions and convert them into changes in optical signals. At the same time, a miniature MEMS accelerometer is installed inside the fixator 3 to detect the acceleration of the entire fixation device in three-dimensional space, thereby comprehensively judging whether there is any abnormal traction action.The alarm information can be sent to the mobile terminal (such as a dedicated PDA or mobile APP) equipped by medical staff via a wireless signal transmission module. Simultaneously, a speaker 9 with different timbre and volume adjustment functions is installed on the fixation device 3, allowing for easy adjustment according to different environments. When the arc-shaped buckle 41 is pulled, the fiber optic sensor will change its light signal due to its deformation, and the MEMS accelerometer will also detect the corresponding acceleration change. These signals are transmitted to the built-in microprocessor. The microprocessor analyzes these signals using a preset algorithm to comprehensively determine the pulling force, direction, and whether it is an abnormal pulling situation. Once it is determined that the pulling force exceeds the safety threshold, the microprocessor triggers the speaker 9 to sound an alarm and simultaneously sends alarm information containing detailed information such as the specific bed number, patient information, and alarm type to the medical staff's mobile terminal via the wireless signal transmission module, ensuring that medical staff are promptly informed and can take appropriate measures, even in noisy environments. The MEMS accelerometer is installed inside the fixation device 3. It can detect the acceleration changes of the indwelling needle connector 6 and the circulatory vessel connector 7, as well as the tubing between them, in three-dimensional space. Its output electrical signal is also transmitted to the microprocessor, and together with the signal from the fiber optic sensor, it is used to determine whether there is any abnormal traction. The MEMS accelerometer selected is the STMicroelectronics LIS3DH triaxial accelerometer. This model has advantages such as low power consumption, high sensitivity, and high accuracy, making it suitable for use in medical devices. It can accurately measure acceleration in three-dimensional space and meets the requirements of this fixation device for monitoring acceleration changes of the dialysis indwelling needle 1 and the extracorporeal circulation vessel 2. The power supply pin (VDD) of the LIS3DH is connected to the power circuit inside the fixation device 3. Its ground pin (GND) is connected to the device's ground line to ensure a normal electrical circuit. The I2C interface (SCL and SDA) of the LIS3DH is connected to the corresponding I2C bus pins on the PCB board 8. Specifically, the SCL pin is connected to the microprocessor's I2C clock line, and the SDA pin is connected to the microprocessor's I2C data line for data transmission with the microprocessor. Through this connection method, the microprocessor can read the acceleration data acquired by the LIS3DH. Speaker 9 uses the TDK PS1240P02BT speaker, which has good sound quality and a suitable volume range, and is compact in size, making it suitable for installation within fixture 3. The positive terminal of speaker 9 is connected to the output of the speaker driver circuit, which is a simple power amplifier, such as an LM386 chip-based amplifier circuit. The input pins of the LM386 receive a PWM signal from the microprocessor, adjusting the power output to speaker 9 according to this signal to achieve volume and tone adjustment. The negative terminal of speaker 9 is connected to the ground line to ensure normal current flow.The power supply pin of the speaker driver circuit is connected to the power supply circuit, and a filter capacitor is added near the power supply pin to ensure power supply stability. The wireless signal transmission module is the Nordic Semiconductor nRF24L01 wireless module, which supports Bluetooth Low Energy and 2.4GHz band communication, has high transmission rate and stability, and meets the requirements of this device for low power consumption and high reliability communication. The power supply pin (VDD) of the nRF24L01 wireless module is connected to the power supply, and the ground pin (GND) is connected to the ground line. Using the SPI interface, the SCK pin of the nRF24L01 is connected to the microprocessor's SPI clock pin, the MOSI pin is connected to the microprocessor's SPI data output pin, the MISO pin is connected to the microprocessor's SPI data input pin, and the CE and CSN pins are connected to the microprocessor's general-purpose digital output pins so that the microprocessor can control the operating mode and data transmission operation of the wireless module. The fiber optic sensor uses the FISO FOP-MIV fiber optic sensor, which has the following advantages: High sensitivity: It can accurately measure minute strain or deformation. Its high sensitivity can detect minute deformations of the elastic snap-fit ​​structure 4 under small tension, converting them into corresponding optical signal changes to meet the early monitoring needs of dialysis indwelling needle 1 slippage. Miniaturization: Its compact size makes it suitable for installation within the elastic snap-fit ​​structure 4 without affecting the structure and function of the fixator 3. It can also be easily arranged at certain intervals, enabling comprehensive monitoring of the deformation of the elastic snap-fit ​​structure 4. Reliability and stability: The sensor has a robust structure and stable performance, maintaining stable operation even under long-term use and complex medical environments. It can effectively resist temperature and humidity changes and a certain degree of mechanical stress, ensuring the reliability of measurement results. Anti-interference capability: It has excellent anti-electromagnetic interference capability, enabling it to operate normally in the complex electromagnetic environment of a hospital, ensuring that the output optical signal accurately reflects the physical state of the elastic snap-fit ​​structure 4 and avoiding erroneous signals caused by electromagnetic interference. Signal conversion and compatibility: The output optical signal can be converted into an electrical signal through a conventional photoelectric conversion circuit, matching the input interface and processing capabilities of the STM32F103C8T6 microprocessor, facilitating subsequent data processing and analysis. Biocompatibility: The sensor materials meet the biocompatibility requirements of medical devices, posing no potential health risks to patients and ensuring the safety of medical applications. Cost-effectiveness: Among similar high-sensitivity, high-reliability fiber optic sensors, FOP-MIV offers good cost-effectiveness, meeting performance requirements without incurring excessive costs, thus enhancing the overall device's market competitiveness. The microprocessor, as the core control unit of the entire device, receives signals from the fiber optic sensor and MEMS accelerometer, analyzes and processes the signals using built-in intelligent algorithms, and determines whether to trigger an alarm based on preset tension thresholds and other parameters.When an abnormal traction is detected, the microprocessor sends control commands to speaker 9 and the wireless signal transmission module. The microprocessor selected is the STM32F103C8T6 microcontroller. This microcontroller has rich peripheral interfaces, moderate performance, and low cost, meeting the data processing and control function requirements of this device. The power supply pin (VDD) of the STM32F103C8T6 microcontroller is connected to the power supply, and the ground pin (GND) is connected to the ground line to ensure normal operation of the microprocessor. The STM32F103C8T6 microcontroller connects to the I2C interface of the LIS3DH to receive the acceleration data it collects. The STM32F103C8T6 microcontroller connects to the output of the fiber optic sensor to receive the electrical signal converted from the optical signal from the fiber optic sensor. The output signal of the fiber optic sensor can be converted into an electrical signal through a photoelectric conversion circuit (such as a photodetector and amplifier), and then connected to the analog input pin of the microprocessor to realize the processing of the optical signal. The STM32F103C8T6 microcontroller connects to the driver circuit of speaker 9, sending control signals to the speaker driver circuit via digital output pins to control the sound output of speaker 9. Pins with PWM output functionality are selected to adjust the volume and timbre of speaker 9. The STM32F103C8T6 microcontroller connects to the control and data pins of the wireless signal transmission module, communicating using a Universal Asynchronous Receiver / Transmitter (UART) or SPI interface. Specifically, when using UART, the microprocessor's TX pin is connected to the wireless signal transmission module's RX pin, and vice versa, enabling bidirectional data transmission. If using the SPI interface, the standard SPI connection method is followed, including SCK, MOSI, and MISO pins, to control the wireless signal transmission module and transmit data. During operation, the LIS3DH accelerometer continuously monitors acceleration changes and transmits the data to the STM32F103C8T6 microprocessor, while the fiber optic sensor converts optical signals into electrical signals and transmits them to the microprocessor. The microprocessor analyzes and processes this data according to its built-in algorithm. When an anomaly is detected, it issues an alarm via speaker 9 driven by the LM386 and simultaneously transmits the alarm information to the mobile terminal of medical staff via the nRF24L01 wireless module, ensuring the safety and reliability of the dialysis process. The wireless signal transmission module uses low-power, high-stability wireless communication technology to establish a communication connection with the mobile terminal of medical staff, accurately transmitting the alarm information from the microprocessor for remote reception and timely response by medical staff. Speaker 9 has volume and tone adjustment functions, which can be set according to different usage environments (such as quiet wards or noisy dialysis rooms). Upon receiving the trigger command from the microprocessor, it emits a clear and audible alarm sound to alert those nearby.During dialysis, patient limb movement may cause traction on the elastic latch structure 4. At this time, the fiber optic sensor will generate a change in optical signal due to the deformation of the elastic latch structure 4, and the MEMS accelerometer will also detect the corresponding acceleration change. These signals are transmitted to the microprocessor in real time. After receiving the signals, the microprocessor analyzes and judges them according to a preset algorithm. If the overall judgment is that the traction force exceeds the safety threshold, the microprocessor simultaneously sends instructions to the speaker 9 and the wireless signal transmission module. The speaker 9 emits an alarm sound, and the wireless signal transmission module sends an alarm message containing detailed patient information and alarm details to the mobile terminal of medical staff. After receiving the information, medical staff can promptly check and handle the situation to prevent the dialysis indwelling needle 1 from slipping out.

[0018] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fixing device for preventing slippage of a dialysis indwelling needle, characterized in that, The device includes a dialysis indwelling needle (1) and an extracorporeal circulation vessel (2). One end of the dialysis indwelling needle (1) is fixed with an indwelling needle connector (6), and one end of the extracorporeal circulation vessel (2) is fixed with a circulation vessel connector (7). A fixator (3) is fixedly sleeved on the outer ends of the indwelling needle connector (6) and the circulation vessel connector (7). One end of the fixator (3) is sleeved with the indwelling needle connector (6) through a sealing rubber gasket (5), and the other end of the fixator (3) is tightly connected to the outer end of the circulation vessel connector (7) through an elastic buckle structure (4). Several fiber optic sensors are uniformly embedded inside the elastic buckle structure (4) of the fixator (3). A micro MEMS accelerometer, a microprocessor, a speaker (9), and a wireless signal transmission module are installed inside the fixator (3). The components are electrically connected to each other through a PCB board (8).

2. The fixing device for preventing slippage of a dialysis indwelling needle according to claim 1, characterized in that, The elastic buckle structure (4) consists of two symmetrical arc buckles (41). One end of the arc buckle (41) is connected to the inner wall of the fixture (3) through a pivot. The arc buckle (41) can rotate around the pivot to achieve opening and closing action. The inner wall of the arc groove of the arc buckle (41) is provided with anti-slip texture (42).

3. The fixing device for preventing slippage of a dialysis indwelling needle according to claim 1, characterized in that, The MEMS accelerometer is the STMicroelectronics LIS3DH triaxial accelerometer.

4. The fixing device for preventing slippage of a dialysis indwelling needle according to claim 1, characterized in that, The microprocessor is an STM32F103C8T6 microcontroller.

5. The fixing device for preventing slippage of a dialysis indwelling needle according to claim 1, characterized in that, The loudspeaker (9) is a TDK PS1240P02BT loudspeaker.

6. The fixing device for preventing slippage of a dialysis indwelling needle according to claim 1, characterized in that, The wireless signal transmission module is the Nordic Semiconductor nRF24L01 wireless module.

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