Interventional surgical compression apheresis system with adaptive decompression and monitoring of exsanguination function

Abstract

This invention discloses an interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions, relating to the field of bleeding monitoring technology. It includes a main control module (MCU microcontroller) that performs system self-tests and acquires surgical site parameters, outputting a device ready signal; an execution module that performs physical fixation via a contour-following fixation module, outputting stable and fixed compression head position information; a construction module that utilizes micro-patterned channels on the surface of a transparent compression pad to guide bleeding to the monitoring area, constructing a high signal-to-noise ratio optical monitoring environment for bleeding, and outputting optimized monitoring signals; and a control module that, based on hand site parameters and the optimized monitoring signals, controls a micro-drive component to establish initial compression force, which is maintained via feedback from a pressure sensing unit. This achieves precise decompression highly matched to the individual's physiological repair process, effectively avoiding the risks of insufficient hemostasis or excessive compression caused by traditional fixed-time decompression.

Description

Technical Field

[0001] This invention relates to the field of monitoring bleeding function, and in particular to an interventional surgical compression hemostasis system that combines adaptive decompression and monitoring of bleeding function. Background Technology

[0002] Hemostasis at the puncture site after interventional procedures directly affects patient prognosis and complication control. Currently, commonly used electronic compression hemostasis systems primarily achieve automated compression through an electromechanical integrated structure. They employ closed-loop control using pressure sensors to maintain the set pressure and utilize a preset time program for phased decompression. These systems, to a certain extent, replace manual operation, improving the speed and consistency of pressure application, and have become a routine auxiliary method after percutaneous coronary interventions and other procedures.

[0003] Current electronic compression hemostasis systems generally employ a fixed-time decompression mode, gradually reducing pressure based on pre-set time intervals, lacking dynamic perception of individual patient differences and the progress of vascular endothelial repair. Furthermore, bleeding monitoring often uses direct or transmitted light paths, directly illuminating the skin surface, which is susceptible to scattering from skin texture, refraction from tissue fluid, and interference from ambient light. This results in effective signals being masked by noise, insufficient sensitivity in identifying minute bleeding, and a high false alarm rate. This time-driven, rigid decompression strategy, coupled with unreliable bleeding feedback, forces clinicians to compromise between safety and risk, making truly individualized and precise hemostasis difficult to achieve. Summary of the Invention

[0004] In view of the aforementioned existing problems, the present invention is proposed.

[0005] Therefore, this invention provides an interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions to solve the problems of insufficient hemostasis safety and accuracy caused by the inability of existing fixed-time decompression logic to match the individual vascular physiological repair process and the lack of closed-loop linkage between bleeding monitoring and decompression control.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: This invention provides an interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions, which includes a main control module, an MCU microcontroller that completes system self-test and acquires surgical site parameters, and outputs a device ready signal; The execution module completes the physical fixation through the contour fixing module and outputs the stable and fixed position information of the pressure head; The module utilizes micro-patterned channels on the surface of a transparent compression pad to guide the accumulation of oozing blood to the monitoring area, thereby creating a high signal-to-noise ratio optical monitoring environment for oozing blood and outputting optimized monitoring signals. The control module, based on hand parameters and optimized monitoring signals, controls the micro-drive component to establish initial pressure, and maintains it through feedback from the pressure sensing unit, outputting a precise initial pressure state. The evaluation module, using an MCU microcontroller, combines optimized monitoring signals with distal blood flow characteristics to assess the progress of vascular endothelial repair and output physiological state criteria. Abandoning modules, based on physiological state criteria, and abandoning the fixed-time decompression mode, it executes adaptive decompression logic synchronized with the vascular repair stage, verifies in real time based on optimized monitoring signals, and outputs dynamic pressure commands. When the adaptive decompression logic of the drive module has been executed and the physiological state criterion meets the removal condition, the drive component is fully depressurized and outputs a removal command.

[0007] As a preferred embodiment of the interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions described in this invention, the main control module includes a sealed medical-grade plastic housing and an MCU microcontroller, a storage chip, and a rechargeable lithium battery disposed within the housing; after completing the system self-test, the MCU microcontroller obtains surgical site parameters through the function key group, retrieves the corresponding initial target pressure value from the storage chip, and outputs a device ready signal.

[0008] As a preferred embodiment of the interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions described in this invention, the execution module is mechanically connected to the contour fixation module, which includes an anatomical contour pressure plate and a suspension bridge-type wide strap; the bottom surface of the anatomical contour pressure plate is a saddle-shaped curved surface, which is fixed at a single point on the front of the thigh by the suspension bridge-type wide strap, so that the compression head is stably aligned with the puncture point and outputs stable and fixed compression head position information.

[0009] As a preferred embodiment of the interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions described in this invention, the construction module reuses the transparent compression pad in the sensing feedback module. The surface of the transparent compression pad is prefabricated with micro-patterned channels composed of alternating hydrophilic and hydrophobic stripes. The micro-volume of blood seeping from the puncture point is actively drained and concentrated below the monitoring window between the infrared emitting tube and the infrared receiving tube by capillary action, thereby constructing a high signal-to-noise ratio bleeding optical monitoring environment and outputting an optimized monitoring signal.

[0010] As a preferred embodiment of the interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions described in this invention, the control module is electrically connected to the micro-drive component and the pressure sensing unit; the MCU microcontroller controls the micro-drive component to establish initial compression force based on surgical site parameters and optimized monitoring signals, and maintains it through closed-loop feedback via the actual pressure returned by the pressure sensing unit, outputting a precise initial compression state.

[0011] As a preferred embodiment of the interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions described in this invention, the evaluation module is configured to, under the initial compression state, synchronously acquire optimized monitoring signals and amplitude data from a distal PPG pulse wave sensor via an MCU microcontroller, evaluate the progress of vascular endothelial repair, compare the current state with a thrombus stability template interval pre-set in the storage chip, and output physiological state criteria.

[0012] As a preferred embodiment of the interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions described in this invention, the rejection module is configured to, in response to the physiological state criteria, reject the fixed-time decompression curve pre-stored in the storage chip, execute adaptive decompression logic synchronized with the vascular repair stage, and before each decompression action is executed, perform real-time verification of bleeding risk based on the optimized monitoring signal and output dynamic pressure command.

[0013] As a preferred embodiment of the interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions described in this invention, the drive module is configured to control the micro-drive component to completely depressurize when the adaptive decompression logic is completed and the physiological state criteria meet the removal conditions, and output a removal command through the audible and visual alarm component. Medical staff then untie the suspension bridge-type wide strap and remove the compression execution module according to the command.

[0014] As a preferred embodiment of the interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions described in this invention, the micro-drive component is a micro-stepping motor or a solenoid valve, and the compression execution module is divided into two structures: mechanical pressure type and pneumatic pressure type. The mechanical pressure type uses a micro-stepping motor to drive a transmission screw to achieve pressure, while the pneumatic type uses a solenoid valve to control the air intake and exhaust of the medical airbag to achieve pressure.

[0015] As a preferred embodiment of the interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions described in this invention, the compression execution module further includes an adaptive compensation spring connected in series between the drive rod and the compression head. The adaptive compensation spring is a disc spring or a medical elastic silicone column, which is used to automatically extend and retract when the patient's limb moves, so as to maintain a constant compression pressure at the puncture point.

[0016] The beneficial effects of this invention are as follows: The main control module completes system self-testing and acquires surgical site parameters; the execution module, in conjunction with the contour fixation module, achieves stable physical fixation of the compression head; the construction module sets micro-patterned channels on the surface of the transparent compression pad to actively enrich oozing blood to the monitoring area to improve the signal-to-noise ratio of the optical signal; the control module establishes and maintains a precise initial compression state based on the surgical site parameters and the optimized monitoring signal; the evaluation module simultaneously acquires the optimized monitoring signal and distal blood flow characteristics, assesses the progress of vascular endothelial repair, and outputs physiological state criteria; the discard module breaks the limitation of fixed-time decompression and executes adaptive decompression logic synchronized with the vascular repair stage; and during the decompression process, it verifies the risk of oozing blood in real time and outputs dynamic pressure commands; finally, the drive module controls the drive component to completely depressurize and outputs a removal command after confirming that the physiological state meets the removal conditions. Thus, while ensuring the safety of hemostasis at the puncture point, it achieves precise decompression that is highly matched with the individual physiological repair process, effectively avoiding the risks of insufficient hemostasis or excessive compression caused by traditional fixed-time decompression. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of an interventional compression hemostasis system that provides adaptive decompression and bleeding monitoring. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0021] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0022] Reference Figure 1This is one embodiment of the present invention, which provides an interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions, comprising the following steps: The main control module includes a sealed medical-grade plastic housing and an MCU microcontroller, a storage chip, and a rechargeable lithium battery housed within the housing. After completing the system self-test, the MCU microcontroller obtains surgical site parameters through the function key group, retrieves the corresponding initial target pressure value from the storage chip, and outputs a device ready signal.

[0023] Furthermore, by encapsulating the MCU microcontroller, memory chip, and rechargeable lithium battery in a sealed medical-grade plastic shell, a highly integrated and reliable control center was constructed. By using a group of function buttons to obtain surgical site parameters and call the initial target pressure value pre-stored in the memory chip, differentiated parameter configurations for different interventional procedures (such as radial artery or femoral artery) were achieved. This ensured electrical safety and accuracy of parameter presets during device startup, providing a standardized data benchmark for subsequent precise pressure control and effectively avoiding the risk of hemostasis failure due to incorrect parameter settings.

[0024] The execution module is mechanically connected to the contour fixation module, which includes an anatomical contour pressure plate and a suspension-type wide strap. The bottom surface of the anatomical contour pressure plate is a saddle-shaped curved surface. It is fixed at a single point on the front of the thigh by the suspension-type wide strap, so that the compression head is stably aligned with the puncture point and outputs stable and fixed compression head position information.

[0025] Furthermore, by closely conforming the saddle-shaped curved surface of the anatomical contouring plate to the anatomical shape of the inguinal ligament and pubic groove, combined with the single-point fixation of the suspension-type wide bandage on the front of the thigh, the compression head is stably locked directly above the puncture point. This structure significantly increases the contact friction force by utilizing the principle of anatomical contouring, fundamentally solving the problem of easy slippage and deflection of traditional flat plate compression plates. At the same time, the suspension-type design avoids the course of the great saphenous vein in the lower limb, minimizing venous return obstruction and limb swelling caused by excessively tight bandages while ensuring secure fixation.

[0026] The construction module reuses the transparent pressure pad in the sensing feedback module. The surface of the transparent pressure pad is prefabricated with micro-patterned channels composed of alternating hydrophilic and hydrophobic stripes. It utilizes capillary action to actively drain and concentrate the trace amount of blood seeping from the puncture point to the area below the monitoring window between the infrared emitting tube and the infrared receiving tube, thereby constructing a high signal-to-noise ratio optical monitoring environment for blood seepage and outputting an optimized monitoring signal.

[0027] Furthermore, by prefabricating micro-patterned channels composed of alternating hydrophilic and hydrophobic stripes on the surface of the transparent compression pad, the capillary action principle is used to actively drain and concentrate the trace amounts of blood seeping from the puncture point to below the monitoring window between the infrared emitting and receiving tubes. This design transforms the traditional "passive waiting for blood to diffuse" into "actively guiding blood to the optical path," significantly improving the signal-to-noise ratio and detection sensitivity of the blood photoelectric signal. It solves the industry pain point that trace amounts of blood are difficult to capture by optical sensors due to diffusion and dilution, providing high-fidelity monitoring data for subsequent intelligent decision-making.

[0028] The control module is electrically connected to the micro-drive component and the pressure sensing unit. The MCU microcontroller controls the micro-drive component to establish the initial pressure based on the surgical site parameters and the optimized monitoring signal. It maintains the pressure through closed-loop feedback via the actual pressure returned by the pressure sensing unit and outputs a precise initial pressure state.

[0029] Furthermore, the control module integrates the MCU microcontroller, micro-drive components, and pressure sensing unit into a real-time closed-loop feedback system, dynamically adjusting the drive output based on surgical site parameters and optimized monitoring signals. This mechanism ensures that the pressure remains stable near the target value, effectively eliminating pressure attenuation or fluctuations caused by tissue deformation, limb micro-movements, and other factors. It achieves digital, visual, and constant maintenance of the pressure, completely replacing the traditional experience-based pressure adjustment that relies on the feel of medical staff.

[0030] The evaluation module is configured to, under initial compression, synchronously acquire optimized monitoring signals and amplitude data from a remote PPG pulse wave sensor via an MCU microcontroller to assess the progress of vascular endothelial repair, compare the current state with a thrombus stabilization template interval pre-set in the storage chip, and output physiological state criteria.

[0031] Furthermore, by simultaneously acquiring optimized monitoring signals and amplitude data from a remote PPG pulse wave sensor through an evaluation module, the progress of vascular endothelial repair is dynamically compared with the thrombus stabilization template pre-installed in the storage chip. This step breaks away from the traditional mechanical mode of timed decompression, upgrading the control basis of the hemostasis process from the "time axis" to the "physiological axis," which can accurately identify the vascular healing status of individual patients, thereby avoiding damage to the vascular wall and surrounding tissues due to excessive compression while ensuring hemostasis safety.

[0032] The rejection module is configured to reject the fixed-time decompression curve pre-stored in the storage chip in response to the physiological state criterion, execute adaptive decompression logic synchronized with the vascular repair stage, and before each decompression action is executed, the risk of bleeding is checked in real time based on the optimized monitoring signal and a dynamic pressure command is output.

[0033] Furthermore, by abandoning the module's response to physiological state criteria, the fixed-time decompression curve pre-stored in the memory chip is actively blocked, and instead adaptive decompression logic synchronized with the vascular repair stage is executed; and before each decompression action is executed, the risk of bleeding is checked in real time based on the optimized monitoring signal (Safety Check). This progressive control logic of "assessment-check-execution" achieves a perfect match between the decompression process and the physiological repair process, which not only prevents rebleeding caused by premature decompression, but also avoids limb ischemia caused by late decompression.

[0034] The drive module is configured to control the micro drive component to fully depressurize when the adaptive decompression logic is completed and the physiological state criteria meet the removal conditions, and to output a removal command through the audible and visual alarm component. Medical staff can then untie the suspension bridge-type wide strap and remove the compression execution module according to the command.

[0035] Furthermore, when the adaptive decompression logic is confirmed to have been completed and the physiological state criteria meet the removal conditions, the drive module controls the micro-drive component to fully depressurize and links the audible and visual alarm component to output a removal command. This design seamlessly integrates the device's operating status with the medical staff's handling procedures, ensuring safe removal of the device at the optimal time and preventing premature or delayed removal due to human error, thereby improving perioperative nursing safety and patient comfort.

[0036] The micro-drive component is a micro-stepping motor or a solenoid valve. The compression execution module is divided into two types: mechanical pressing and pneumatic pressing. The mechanical pressing type uses a micro-stepping motor to drive a transmission screw to achieve pressurization, while the pneumatic type uses a solenoid valve to control the air intake and exhaust of the medical airbag to achieve pressurization.

[0037] Furthermore, by configuring two driving methods—a micro stepper motor and a solenoid valve—the compression execution module can be flexibly switched between a mechanical pressing type and a pneumatic pressing type. The mechanical pressing type uses a transmission screw to achieve rigid and precise displacement control, which is suitable for the femoral artery that requires strong compression. The pneumatic type uses a medical airbag to achieve flexible surface compression, which is suitable for the highly sensitive radial artery, thereby greatly expanding the clinical application range and scenario compatibility of the system.

[0038] The compression execution module also includes an adaptive compensation spring connected in series between the drive rod and the compression head. The adaptive compensation spring is a disc spring or a medical elastic silicone column, which is used to automatically extend and retract when the patient's limb moves, so as to maintain a constant compression pressure at the puncture point.

[0039] Furthermore, by connecting a disc spring or a medical elastic silicone column in series between the drive rod and the compression head as an adaptive compensation spring, the deformation characteristics of the elastic element are used to automatically absorb the displacement changes caused by the patient's limb movement, turning over, or tissue swelling. This structure achieves passive adaptive compensation of the compression pressure without increasing the complexity of system control, ensuring the stability of the puncture point under pressure in a dynamic environment and effectively protecting the fragile initial coagulation wound from damage.

[0040] In summary, this invention uses a main control module to perform system self-checks and acquire surgical site parameters. An execution module, in conjunction with a contour fixation module, achieves stable physical fixation of the compression head. A construction module creates micro-patterned channels on the surface of the transparent compression pad, actively enriching oozing blood to the monitoring area to improve the signal-to-noise ratio of the optical signal. The control module establishes and maintains a precise initial compression state based on surgical site parameters and optimized monitoring signals. An evaluation module simultaneously acquires optimized monitoring signals and distal blood flow characteristics, assesses the progress of vascular endothelial repair, and outputs physiological state criteria. This eliminates the limitation of fixed-time decompression by a separate module, executing adaptive decompression logic synchronized with the vascular repair stage. During decompression, it verifies oozing risk in real time and outputs dynamic pressure commands. Finally, the drive module, after confirming that the physiological state meets the removal conditions, controls the drive components to completely depressurize and outputs a removal command. Thus, while ensuring hemostasis at the puncture point, it achieves precise decompression highly matched to the individual's physiological repair process, effectively avoiding the risks of insufficient hemostasis or excessive compression caused by traditional fixed-time decompression.

[0041] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An interventional surgical compression hemostasis system for adaptive decompression and monitoring of bleeding function, characterized in that: This includes the main control module, where the MCU microcontroller completes system self-testing, acquires surgical site parameters, and outputs a device ready signal; The execution module completes the physical fixation through the contour fixing module and outputs the stable and fixed position information of the pressure head; The module utilizes micro-patterned channels on the surface of a transparent compression pad to guide the accumulation of oozing blood to the monitoring area, thereby creating a high signal-to-noise ratio optical monitoring environment for oozing blood and outputting optimized monitoring signals. The control module, based on hand parameters and optimized monitoring signals, controls the micro-drive component to establish initial pressure, and maintains it through feedback from the pressure sensing unit, outputting a precise initial pressure state. The evaluation module, using an MCU microcontroller, combines optimized monitoring signals with distal blood flow characteristics to assess the progress of vascular endothelial repair and output physiological state criteria. Abandoning modules, based on physiological state criteria, and abandoning the fixed-time decompression mode, it executes adaptive decompression logic synchronized with the vascular repair stage, verifies in real time based on optimized monitoring signals, and outputs dynamic pressure commands. When the adaptive decompression logic of the drive module has been executed and the physiological state criterion meets the removal condition, the drive component is fully depressurized and outputs a removal command.

2. The interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions as described in claim 1, characterized in that: The main control module includes a sealed medical-grade plastic housing and an MCU microcontroller, a storage chip, and a rechargeable lithium battery housed within the housing. After completing the system self-test, the MCU microcontroller obtains surgical site parameters through the function key group, retrieves the corresponding initial target pressure value from the storage chip, and outputs a device ready signal.

3. The interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions as described in claim 2, characterized in that: The execution module is mechanically connected to the contour fixation module, which includes an anatomical contour pressure plate and a suspension-type wide strap. The bottom surface of the anatomical contour pressure plate is a saddle-shaped curved surface. It is fixed at a single point on the front of the thigh by the suspension-type wide strap, so that the compression head is stably aligned with the puncture point and outputs stable and fixed compression head position information.

4. The interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions as described in claim 3, characterized in that: The construction module reuses the transparent pressure pad in the sensing feedback module. The surface of the transparent pressure pad is prefabricated with micro-patterned channels composed of alternating hydrophilic and hydrophobic stripes. It utilizes capillary action to actively drain and concentrate the trace amount of blood seeping from the puncture point to the area below the monitoring window between the infrared emitting tube and the infrared receiving tube, thereby constructing a high signal-to-noise ratio optical monitoring environment for blood seepage and outputting an optimized monitoring signal.

5. The interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions as described in claim 4, characterized in that: The control module is electrically connected to the micro-drive component and the pressure sensing unit. The MCU microcontroller controls the micro-drive component to establish the initial pressure based on the surgical site parameters and the optimized monitoring signal. It maintains the pressure through closed-loop feedback via the actual pressure returned by the pressure sensing unit and outputs a precise initial pressure state.

6. The interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions as described in claim 5, characterized in that: The evaluation module is configured to, under initial compression, synchronously acquire optimized monitoring signals and amplitude data from a remote PPG pulse wave sensor via an MCU microcontroller to assess the progress of vascular endothelial repair, compare the current state with a thrombus stabilization template interval pre-set in the storage chip, and output physiological state criteria.

7. The interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions as described in claim 6, characterized in that: The rejection module is configured to reject the fixed-time decompression curve pre-stored in the storage chip in response to the physiological state criterion, execute adaptive decompression logic synchronized with the vascular repair stage, and before each decompression action is executed, the risk of bleeding is checked in real time based on the optimized monitoring signal and a dynamic pressure command is output.

8. The interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions as described in claim 7, characterized in that: The drive module is configured to control the micro drive component to fully depressurize when the adaptive decompression logic is completed and the physiological state criteria meet the removal conditions, and to output a removal command through the audible and visual alarm component. Medical staff can then untie the suspension bridge-type wide strap and remove the compression execution module according to the command.

9. The interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions as described in claim 8, characterized in that: The micro-drive component is a micro-stepping motor or a solenoid valve. The compression execution module is divided into two types: mechanical pressing and pneumatic pressing. The mechanical pressing type uses a micro-stepping motor to drive a transmission screw to achieve pressurization, while the pneumatic type uses a solenoid valve to control the air intake and exhaust of the medical airbag to achieve pressurization.

10. The interventional surgical compression hemostasis system with adaptive decompression and bleeding monitoring functions as described in claim 9, characterized in that: The compression execution module also includes an adaptive compensation spring connected in series between the drive rod and the compression head. The adaptive compensation spring is a disc spring or a medical elastic silicone column, which is used to automatically extend and retract when the patient's limb moves, so as to maintain a constant compression pressure at the puncture point.

Images