CN-122006014-A - Automatic recanalization system for central venous catheter blockage

CN122006014ACN 122006014 ACN122006014 ACN 122006014ACN-122006014-A

Abstract

The invention discloses an automatic recanalization system for central venous catheter blockage, which comprises a main controller, a three-way valve control module, a double-injector driving module and a pressure monitoring module, wherein the main controller, the three-way valve control module, the double-injector driving module and the pressure monitoring module can fully automatically execute standard recanalization operation cycles comprising push injection attempt, negative pressure suction and liquid transfer, and intelligently adjust operation parameters and flow according to real-time pressure feedback.

Inventors

WANG JIAYAN
HUANG SHUN
LU DANDAN
ZHAO HUA
WANG YE
YU HUIYING
LI BING

Assignees

中国人民解放军总医院第五医学中心

Dates

Publication Date: 20260512
Application Date: 20260212

Claims (10)

1. An automatic recanalization system for central venous catheter occlusion, comprising: the main controller is used for executing an automatic recanalization program and coordinating the operation of each module of the system; The three-way valve control module is electrically connected with and drives a three-way valve, and the three-way valve is provided with three ports respectively connected with a central venous catheter of a patient, a first injector and a second injector, wherein the three-way valve control module switches the flow path of the three-way valve according to the instruction of the main controller so as to circularly switch the three-way valve between at least three states, wherein the first state is used for enabling the central venous catheter to be communicated with the first injector, the second state is used for enabling the central venous catheter to be communicated with the second injector, and the third state is used for enabling the first injector to be communicated with the second injector; the syringe driving module comprises a first driving unit and a second driving unit, wherein the first driving unit and the second driving unit respectively and independently drive the plungers of the first syringe and the second syringe to move, the first driving unit performs reciprocating push-pull operation on the plungers of the first syringe when the three-way valve is in a first state, the second driving unit performs reciprocating push-pull operation on the plungers of the second syringe when the three-way valve is in a second state, and the first driving unit and the second driving unit are cooperatively controlled when the three-way valve is in a third state, so that liquid is transferred between the first syringe and the second syringe; the pressure monitoring module monitors the pressure in the pipeline communicated with the central venous catheter in real time and feeds back pressure data to the main controller; And the circulation control module is integrated in the main controller and is used for controlling the three-way valve control module and the injector driving module based on feedback of the preset program parameters and/or the pressure monitoring module, and circularly repeating the recanalization operation program.
2. An automatic recanalization system for central venous catheter occlusion according to claim 1, characterized in that said recanalization procedure comprises the steps of: S1, controlling a three-way valve to be switched to a first state, starting a first driving unit, attempting to push a plunger of a first syringe with preset injection force, and monitoring pressure change at the same time; S2, if the pressure is monitored to exceed a first preset threshold value and the plunger displacement does not reach the expected value in the step S1, judging that the blocking resistance is encountered, controlling the three-way valve to be switched to a second state, starting the second driving unit, and pumping the plunger of the second syringe at the maximum negative pressure; S3, controlling the three-way valve to switch to the third state, and cooperatively controlling the first driving unit and the second driving unit to transfer the content in the first syringe to the second syringe; S4, repeating the steps S1 to S3 to form a cycle until the pushing pressure detected by the pressure monitoring module in the step S1 is lower than a first preset threshold value and lasts for a preset time or reaches a preset cycle number.
3. The automatic recanalization system for central venous catheter occlusion according to claim 2, wherein the feedback of the pressure monitoring module is used to adjust the execution logic of the cycle control module such that when the peak bolus pressure monitored in step S1 exceeds a second preset threshold, which is higher than the first preset threshold, the main controller temporarily interrupts the current cycle, controls the three-way valve to switch to the second state, and extends the negative pressure pumping duration of the second drive unit.
4. An automatic recanalization system for central venous catheter occlusion according to claim 3, characterized in that the circulation control module further comprises an occlusion degree evaluation module for grading the severity of the occlusion according to at least one of the rate of rise of time and pressure required to reach the first preset threshold in step S1 and the volume of liquid pumped out by the second drive unit in a single circulation, and adjusting the preset bolus force of step S1, the maximum negative pressure value of step S2 and the liquid transfer rate of step S3 in subsequent circulation according to the grading result.
5. The automatic recanalization system for a central venous catheter occlusion according to claim 4, further comprising a safety protection module that includes a main controller that aborts the automatic recanalization process and issues an alarm indicating that a catheter replacement is likely to be needed when the occlusion severity level determined by the occlusion level evaluation module reaches a maximum level and the volume of fluid aspirated in step S2 is below a minimum volume threshold value for a predetermined number of consecutive cycles.
6. An automatic recanalization system for central venous catheter occlusion according to claim 5, characterized in that the first and second drive units of the injector drive module are driven by stepper motors or servo motors and are equipped with displacement sensors for accurate control of the stroke, speed of the plunger and real time monitoring of the position of the plunger.
7. The automated recanalization system for occlusion of a central venous catheter of claim 6, further comprising a human-machine interface for an operator to input or modify program parameters including, but not limited to, a first preset threshold, a second preset threshold, a preset number of cycles, a duration of each step in a single cycle, a preset bolus force of the first drive unit, and a maximum negative pressure value of the second drive unit, wherein the human-machine interface further displays in real time a current number of cycles, a real time pressure waveform, a volume of fluid aspirated, an occlusion degree assessment result, and a system status.
8. An automatic recanalization system for central venous catheter occlusion according to claim 7, wherein the first syringe is prefilled with a thrombolytic agent solution for recanalization and the second syringe is initially empty, and the circulation control module controls the three-way valve and the syringe drive module to perform an initialization procedure prior to initiating the recanalization procedure, injects a predetermined dose of the thrombolytic agent from the first syringe into the central venous catheter and stands for a predetermined period of time, and then resumes performing the recanalization procedure.
9. The automatic recanalization system for central venous catheter occlusion according to claim 8, wherein the initialization procedure includes controlling a three-way valve to communicate the central venous catheter with the first syringe, slowly pushing a plunger at a low speed by the first drive unit to inject thrombolytic agent into the catheter, switching the three-way valve to isolate the catheter after injection is completed, entering a rest phase, and displaying a rest countdown on the human-machine interface by the main controller.
10. An automatic recanalization system for central venous catheter occlusion according to claim 9, wherein the system is integrated within a portable device housing, wherein the three-way valve, the first syringe and the second syringe are quickly removably mounted within the housing at designated functional locations.

Description

Automatic recanalization system for central venous catheter blockage Technical Field The invention relates to the technical field of medical appliances, in particular to an automatic recanalization system for central venous catheter blockage. Background Central venous catheters are clinically important infusion channels, but lumen occlusion is a common complication, and when total occlusion occurs, standard recanalization methods typically rely on a medical professional manually operating a three-way valve and two syringes (one typically placed vertically for bolus injection and the other for aspiration) to form a closed loop, by repeatedly and rapidly switching the three-way valve pathway, and alternating bolus-aspiration operations in an effort to dissolve or remove the occlusion using the positive and negative pressure impact of the fluid and mechanical forces. The operation requires an operator (usually a nurse) to continuously, rapidly and forcefully repeatedly push and pull the syringe piston and screw the three-way valve for a few minutes or even longer, which is a great test on hand strength and endurance, is extremely easy to cause muscle fatigue, ache and even occupational strain of the operator, and in a fatigue state, the rhythm, strength and accuracy of the operation can be rapidly reduced, and the recanalization effect and efficiency are directly affected. Meanwhile, the whole re-passage process lacks objective and continuous mechanical feedback monitoring, an operator only judges resistance according to hand feeling, and the push injection pressure and the suction negative pressure cannot be quantified, so that the risk of catheter rupture or thrombus shedding embolism caused by excessive force exists, and the effective dredging cannot be realized due to insufficient force. Accordingly, in response to the problems set forth above, the present invention provides an automatic recanalization system for central venous catheter occlusion. Disclosure of Invention In order to solve the problems that the existing manual recanalization method is seriously dependent on the physical strength and experience of operators, has low efficiency and has safety risk, the invention provides an automatic recanalization system for central venous catheter blockage, which automatically executes a recanalization operation program through an integrated electromechanical control module and a sensor, monitors pipeline pressure in real time, and replaces a machine to manually complete high-strength and high-repeatability operation, thereby realizing safe and efficient catheter recanalization. The technical scheme of the invention is that the automatic recanalization system for central venous catheter blockage comprises: the main controller is used for executing an automatic recanalization program and coordinating the operation of each module of the system; The three-way valve control module is electrically connected with and drives a three-way valve, and the three-way valve is provided with three ports respectively connected with a central venous catheter of a patient, a first injector and a second injector, wherein the three-way valve control module switches the flow path of the three-way valve according to the instruction of the main controller so as to circularly switch the three-way valve between at least three states, wherein the first state is used for enabling the central venous catheter to be communicated with the first injector, the second state is used for enabling the central venous catheter to be communicated with the second injector, and the third state is used for enabling the first injector to be communicated with the second injector; the syringe driving module comprises a first driving unit and a second driving unit, wherein the first driving unit and the second driving unit respectively and independently drive the plungers of the first syringe and the second syringe to move, the first driving unit performs reciprocating push-pull operation on the plungers of the first syringe when the three-way valve is in a first state, the second driving unit performs reciprocating push-pull operation on the plungers of the second syringe when the three-way valve is in a second state, and the first driving unit and the second driving unit are cooperatively controlled when the three-way valve is in a third state, so that liquid is transferred between the first syringe and the second syringe; the pressure monitoring module monitors the pressure in the pipeline communicated with the central venous catheter in real time and feeds back pressure data to the main controller; The circulation control module is integrated in the main controller and is used for controlling the three-way valve control module and the injector driving module based on feedback of the preset program parameters and/or the pressure monitoring module, and the circulation repeated recanalization operation program comprises the following steps that the sin