PCS magnetic control indwelling tube, implantation assembly and displacement control method and system thereof

Abstract

The invention relates to the field of medical instruments, in particular to a PCS magnetic control indwelling catheter, an implantation assembly and a displacement control method and system.The PCS magnetic control indwelling catheter comprises a medicine box body implanted subcutaneously and a catheter in fluid communication with the medicine box body, and the catheter comprises a transfusion channel and an electromagnet channel; a recovery mechanism used for containing the electromagnet assembly and a control module used for supplying power are arranged in the medicine box body, a locking device capable of being activated according to needs is integrated in the electromagnet assembly, and the locking device is configured to be capable of responding to an instruction from the control module to be locked after the electromagnet assembly reaches the terminal point of the moving stroke of the electromagnet assembly. Therefore, a temporary rigid anchoring point is formed in the conduit. According to the invention, the electromagnet assembly moves under the guidance of an external magnetic force source, and is matched with the anchoring function of the locking device, so that non-invasive and accurate displacement control of the far end of the indwelling tube is realized, and the tail end of the electromagnet channel can be permanently sealed through high-temperature ironing after cutting, so that the safety is improved.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to a PCS magnetically controlled indwelling catheter.

[0002] The present invention also relates to an implantable component.

[0003] The present invention also relates to a method for shifting control of a PCS magnetically controlled indwelling tube.

[0004] The present invention also relates to a displacement control system for a PCS magnetically controlled indwelling tube. Background Technology

[0005] Indwelling catheters, such as central venous catheters (PICC) or arterial infusion catheters, are important tools in modern clinical treatment. These devices involve inserting a specially designed flexible catheter through a peripheral blood vessel (such as the upper arm vein or femoral artery) so that its end reaches the predetermined position of the target blood vessel.

[0006] In intravenous applications, the catheter tip is usually placed in a large vein (such as the superior vena cava) near the heart, and the implantable cartridge at its proximal end is buried under the skin, providing a safe and convenient drug delivery channel for patients who require long-term, repeated intravenous treatment (such as chemotherapy and parenteral nutrition support).

[0007] In arterial applications, catheters can be precisely placed in the blood supply arteries of specific organs via pathways such as the femoral artery. For example, the catheter tip can be placed in the blood supply artery of a liver tumor to perform targeted arterial infusion chemotherapy or embolization therapy.

[0008] However, existing intravascular catheters share a common and significant problem: catheter tip displacement.

[0009] In the venous system, due to the patient's breathing, coughing, changes in body position, or the elasticity of the catheter itself, the distal end of the catheter may drift from its optimal position (such as the lower third of the superior vena cava), mistakenly entering the right atrium, right ventricle, or even ectopically into the internal jugular vein, potentially causing serious complications such as arrhythmia, vascular wall damage, and thrombosis. In the arterial system, the precise position of the catheter is crucial to the treatment effect. Even a slight displacement may cause chemotherapy drugs to flow to non-target organs, causing severe toxic side effects or significantly reducing the effectiveness of tumor treatment.

[0010] The main methods for treating catheter displacement currently include: Interventional radiology: Under the guidance of X-ray fluoroscopy (DSA), doctors attempt to use tools such as guide wires to "hook" the catheter back into its original position. This method requires a high level of experience from the operator and sophisticated equipment, and carries the risk of failure.

[0011] Surgical repositioning or replacement: If the interventional approach fails, surgery is required to open the original implantation site, completely remove the catheter, and then reposition or replace it. This undoubtedly increases the patient's pain, infection risk, and medical costs. Summary of the Invention

[0012] The purpose of this invention is to provide a PCS magnetically controlled indwelling catheter and implantation component, as well as a displacement control method and system, which aims to solve the complications and high-risk repositioning problems caused by displacement of existing central venous catheters after long-term implantation. This invention introduces a controllable electromagnet component inside the catheter and enables it to interact with an external magnetic field, thereby achieving non-invasive and precise control of the catheter tip.

[0013] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution: A PCS magnetically controlled indwelling catheter includes a catheter communicating with a drug cartridge body implanted under the skin; The catheter includes an electromagnet channel arranged along the length of the catheter, which is physically isolated from the infusion channel inside the catheter used for infusion. The PCS magnetically controlled indwelling tube also includes: An electromagnet assembly movably housed within the electromagnet channel, which integrates an electromagnetic coil and an electrically controlled locking device. A recycling mechanism located inside the medicine box is connected to the electromagnet assembly via a flexible cable; An electrode connector located inside the medicine box; A control module located inside the medicine box, electrically connected to the electrode connector and the electromagnet assembly, is used to selectively supply power to the electromagnetic coil and / or the electrically controlled locking device when receiving power and commands from outside the body.

[0014] Furthermore, the recovery mechanism includes a take-up reel and a return spring. One end of the flexible cable is connected to the electromagnet assembly, and the other end is wound around the take-up reel. The return spring is used to drive the take-up reel to retract the flexible cable and the electromagnet assembly when the external driving force disappears.

[0015] Furthermore, the electrically controlled locking device includes: At least one radially retractable locking arm; A miniature actuator for driving the extension and retraction of the locking arm; A reset mechanism is provided for radially retracting the locking arm when the micro-actuator stops driving.

[0016] Furthermore, the micro actuator and the locking arm are connected by an inclined guide block, which is used to convert the axial movement of the actuator of the micro actuator into the radial movement of the locking arm.

[0017] Furthermore, the control module also includes a receiving coil for receiving commands from outside the body via inductive wireless communication.

[0018] An implantable component, comprising: The aforementioned PCS magnetically controlled indwelling tube; A medicine box body has a medicine chamber and an instrument chamber inside. The infusion channel is connected to the medicine chamber, and the electromagnet channel is connected to the instrument chamber. The electromagnet assembly, the recycling mechanism and the control module are all located in the instrument chamber.

[0019] A displacement control system for a PCS magnetically controlled indwelling tube, used for displacement control of the PCS magnetically controlled indwelling tube; comprising: An external power supply unit includes a power supply electrode that is inserted into the body of the medicine box from outside the body and configured to supply power to an electrode connector inside the medicine box. An external control unit is configured to transmit commands to the control module via inductive wireless communication; An external magnetic source is configured to interact with an electromagnetic coil within the electromagnet assembly via a magnetic field.

[0020] A method for shifting a PCS magnetically controlled indwelling tube, used to control the shifting of a PCS magnetically controlled indwelling tube; comprising the following steps: Power supply: A power supply electrode is inserted from outside the body into an electrode connector inside the medicine box to establish a detachable electrical connection. Guidance and Deployment: An external control unit sends a command to the control module, causing the control module to supply power to the electromagnetic coil inside the electromagnet assembly; simultaneously, the external magnetic source interacts with the electromagnetic coil to guide the electromagnet assembly to a predetermined position along the electromagnet channel. Active locking: When the electromagnet assembly reaches the predetermined position, the external control unit sends a command to the control module to supply power to the electronic locking device in the electromagnet assembly, thereby activating the electronic locking device and locking the electromagnet assembly in the electromagnet channel. Displacement control: By interacting with the electromagnetic coil through the external magnetic source, the electromagnet assembly and the end of the catheter are guided to a predetermined position, thereby achieving non-invasive repositioning of the catheter end; Unlocking and Retrieval: After the non-invasive repositioning of the catheter tip is completed, the external control unit sends a command to the control module to stop the power supply to the electrically controlled locking device so as to unlock it; when the external magnetic source and external power supply unit are removed, the retrieval mechanism automatically pulls the electromagnet assembly back into the medicine box.

[0021] Furthermore, the guiding and deployment step and the displacement control step achieve axial movement and / or rotation of the electromagnet assembly by changing the direction or intensity of the magnetic field of the external magnetic source.

[0022] Furthermore, the unlocking and recycling step involves automatically pulling back the electromagnet assembly under the mechanical potential energy of the reset spring of the recycling mechanism.

[0023] The advantages of this invention compared to the prior art are: The embodiments of the present invention can be safely used as a central venous catheter in the venous system, and can also be stably placed in an arterial perfusion catheter in an artery. For example, it can be inserted into the blood supply artery of a liver tumor via the femoral artery for targeted therapy, which solves the problem of the limited application scenarios of the prior art and has strong versatility.

[0024] In embodiments of the present invention, when catheter displacement occurs, power to the electromagnet can be achieved through a single simple puncture. The interaction between an external magnetic source and the implanted electromagnet assembly enables non-invasive repositioning of the distal end of the indwelling catheter. Furthermore, by controlling the current direction of the external power supply device to change the N / S polarity of the electromagnet, the catheter tip can be "pulled" or "pushed," allowing for precise adjustments in multiple dimensions, including forward, backward, and directional movements. This results in a high success rate of repositioning, avoiding secondary trauma, reducing the risk of infection, and minimizing patient suffering and medical costs. The embodiments of the present invention are non-magnetic in the normal state when not powered, and patients will not be affected by external magnetic fields in their daily lives. Attached Figure Description

[0025] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0026] Figure 1 This is a top view of an embodiment of the present invention; Figure 2 for Figure 1 A cross-sectional view along the AA direction; Figure 3 for Figure 1 A cross-sectional view along the BB direction; Figure 4 for Figure 1 A cross-sectional view along the CC direction; Figure 5 This is a perspective view of an embodiment of the present invention, in which the medicine box is transparent; The labels in the diagram represent the following: 1-Drug box body; 11-Drug solution chamber; 12-Instrument chamber; 2-Catheter; 21-Electromagnetic channel; 22-Infusion channel; 3-Electromagnetic assembly; 5-Electrically controlled locking device; 51-Locking arm; 52-Angled guide block; 6-Retrieval mechanism; 61-Rewinding wheel; 62-Reset spring; 63-Flexible cable; 7-Control module; 71-Electrode connector; 8-External power supply unit; 81-Power supply electrode. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] This embodiment mainly consists of an implantable component and an external cooperating device used outside the body.

[0029] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The implantation component includes a drug cartridge 1 and a PCS magnetically controlled indwelling catheter.

[0030] The medicine box body 1 is made of medical-grade titanium alloy material. Its interior is divided into an independent medicine liquid chamber 11 and an instrument chamber 12 by a sealed barrier: the medicine liquid chamber 11 is used to store and deliver medicine liquid, while the instrument chamber 12 is used to house all electromechanical components.

[0031] This design ensures a sterile environment for the medication and keeps the electromechanical components dry and safe, effectively isolating the infusion function from the electromechanical function and reducing the risk of cross-contamination.

[0032] Inside the instrument cavity 12, there is a recessed electrode connector 71 for forming a detachable electrical connection with an external power supply electrode 81 to provide power to the system.

[0033] The PCS magnetically controlled indwelling tube includes a double-lumen catheter 2, which is an integrally extruded structure. It contains an infusion channel 22 and an electromagnet channel 21. The infusion channel 22 is connected to the drug chamber 11 of the drug box body 1 for delivering the drug. The electromagnet channel 21 provides a smooth and independent moving track for the electromagnet assembly 3.

[0034] During the implantation procedure, after the excess length of the catheter 2 is cut off, medical staff can use a special tool to heat-seal the end of the electromagnet channel 21 to make it permanently sealed, thereby reducing the possibility of blood or other bodily fluids entering the electromagnet channel 21 from the end of the catheter 2. This dual-lumen design completely isolates the electromagnet assembly 3 from blood and bodily fluids, effectively reducing the risk of thrombosis during movement.

[0035] refer to Figure 2 and Figure 3 The recovery mechanism 6 is located inside the instrument cavity 12. Its core is a winding wheel 61 with a built-in reset spring 62. A flexible cable 63 with conductive and highly flexible properties is wound around the winding wheel 61. One end of the cable is connected to the winding wheel 61, and the other end passes through the electromagnet channel 21 and is connected to the electromagnet assembly 3.

[0036] The recycling mechanism 6 adopts a passive design, which aims to provide a safe recycling solution when the system is powered off or the external driving force is lost: when the electromagnet assembly 3 moves toward the end of the conduit 2 under the action of external magnetic force, the flexible cable 63 is pulled out, the return spring 62 is compressed and stores potential energy; when the external driving force is removed, the potential energy of the spring is released, driving the winding wheel 61 to rotate, thereby retracting the flexible cable 63 and passively pulling the electromagnet assembly 3 back to the initial position inside the medicine box 1.

[0037] This design ensures that the system can safely retract the electromagnet assembly 3 under any circumstances, thus improving the system's safety.

[0038] refer to Figure 3 and Figure 4 The electromagnet assembly 3 is located inside the electromagnet channel 21, and it integrates an electromagnetic coil and an electrically controlled locking device 5.

[0039] The electromagnetic coil is powered by a flexible cable 63. When energized, it experiences Lorentz force or magnetic gradient force in the magnetic field generated by an external magnetic source (e.g., the magnetic field generator of an interventional magnetic navigation system), thereby achieving axial and rotational movement along the electromagnet channel 21. This design enables the system to utilize mature external magnetic navigation technology for macroscopic positioning, improving guidance efficiency and accuracy.

[0040] The electrically controlled locking device 5 is integrated within the electromagnet assembly 3 for active anchoring after positioning. The device includes one or more radially retractable locking arms 51, a miniature actuator, and an inclined guide block 52.

[0041] Among them, the micro actuator (not shown in the figure) can be made of shape memory alloy wire or micro piezoelectric unit.

[0042] The miniature actuator is powered by the flexible cable 63 and is activated when it receives a command, generating axial movement. This axial movement is precisely converted into the radial extension movement of the locking arm 51 through the inclined structure of the inclined guide block 52. After the locking arm 51 extends radially, it contacts the inner wall of the electromagnet channel 21 and generates friction, thereby locking the electromagnet assembly 3 in the current position.

[0043] This design enables the system to switch from "moving" mode to "anchoring" mode, solving the problem of the lack of an active locking mechanism in existing technologies.

[0044] To ensure successful unlocking, a miniature return spring 62 is provided inside the locking arm 51 or on the miniature actuator. When the actuator stops supplying power, the return spring 62 pushes the locking arm 51 back to its retracted state, releasing the lock on the electromagnet assembly 3 and restoring the electromagnet assembly 3 to its mobility.

[0045] The control module 7 is located inside the instrument cavity 12. It receives power from the outside through the electrode connector 71. The control module 7 integrates a power management circuit and a receiving coil.

[0046] According to the instructions from the external control unit, the control module 7 distributes electrical energy to the electromagnetic coil or the electronic locking device 5: when the instruction is "move", the power is only supplied to the electromagnetic coil; when the instruction is "lock", the power is only supplied to the electronic locking device 5.

[0047] The external cooperating equipment includes: an external control unit, an external power supply unit 8, and an external magnetic source.

[0048] The external control unit (not shown) includes a transmitting coil for inductive wireless communication with the control module 7 implanted within the implant. This unit generates an alternating magnetic field by applying an alternating electrical signal to the transmitting coil. This magnetic field induces a voltage in the receiving coil within the implant, carrying encoded digital instructions.

[0049] This non-invasive communication method avoids any connection that penetrates the skin, greatly improving biosafety.

[0050] The external power supply unit 8 provides the electrical energy required for the operation of the entire system by connecting the electrode connector 71.

[0051] The external magnetic source (not shown in the figure) is usually a high field strength magnetic navigation system used to interact with the electromagnetic coil in the electromagnet assembly 3 to provide driving force for the movement of the conduit 2.

[0052] This embodiment provides a displacement control method based on the above-mentioned PCS magnetically controlled indwelling tube, and the workflow is as follows: Preparation stage: Insert the external power supply electrode 81 through an external puncture into the electrode connector 71 inside the medicine box 1 to establish an electrical connection, and put the external magnetic source and external control unit into working state.

[0053] Guidance and deployment phase: The external control unit sends a command, and the control module 7 switches the power to the electromagnetic coil in the electromagnet assembly 3. The doctor uses the magnetic field of the external magnetic source to precisely guide the electromagnet assembly 3 to move along the electromagnet channel 21 and deploy the end of the catheter 2 to the predetermined position.

[0054] Active locking phase: When the end of the conduit 2 reaches the target position, the external control unit sends a command, and the control module 7 supplies power to both the electromagnetic coil and the electric locking device 5. The electric locking device 5 is activated, and the locking arm 51 extends radially, forming friction with the inner wall of the channel, thus anchoring the electromagnet assembly 3 in the current position.

[0055] Displacement control: Through the interaction between an external magnetic source and an electromagnetic coil, the electromagnet assembly 3 and the end of the catheter 2 are guided to a predetermined position, thereby achieving non-invasive repositioning of the end of the catheter 2.

[0056] Unlocking and Retrieval Phase: After the non-invasive repositioning of the end of catheter 2 is completed, the external control unit sends an unlocking command, the control module 7 stops supplying power to the electromagnetic coil and the electrically controlled locking device 5, the locking arm 51 automatically retracts under the action of the reset spring 62, and the lock is released. Subsequently, the external power supply and magnetic source are removed, the reset spring 62 of the retrieval mechanism 6 will automatically drive the flexible cable 63 to retract, and pull the electromagnet assembly 3 back to the initial position inside the medicine box 1, and the system returns to standby state.

[0057] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered as falling within the scope of protection of the embodiments of the present invention.

Claims

1. A PCS magnetically controlled indwelling catheter, comprising a catheter (2) communicating with a drug cartridge (1) implanted subcutaneously; characterized in that, The catheter (2) includes an electromagnet channel (21) arranged along the length of the catheter (2), which is physically isolated from the infusion channel (22) inside the catheter (2) for infusion. The PCS magnetically controlled indwelling tube also includes: An electromagnet assembly (3) is movably housed within the electromagnet channel (21), which integrates an electromagnetic coil and an electrically controlled locking device (5). A recycling mechanism (6) located inside the medicine box body (1) is connected to the electromagnet assembly (3) via a flexible cable (63); An electrode connector (71) located inside the medicine box body (1); A control module (7) located inside the medicine box body (1) is electrically connected to the electrode connector (71) and the electromagnet assembly (3) for selectively supplying power to the electromagnetic coil and / or the electrically controlled locking device (5) when receiving power and instructions from outside the body.

2. The PCS magnetically controlled indwelling tube according to claim 1, characterized in that, The recycling mechanism (6) includes a winding wheel (61) and a return spring (62). One end of the flexible cable (63) is connected to the electromagnet assembly (3), and the other end is wound around the winding wheel (61). The return spring (62) is used to drive the winding wheel (61) to retract the flexible cable (63) and the electromagnet assembly (3) when the external driving force disappears.

3. The PCS magnetically controlled indwelling tube according to claim 1, characterized in that, The electrically controlled locking device (5) includes: At least one radially retractable locking arm (51); A miniature actuator for driving the extension and retraction of the locking arm (51); A reset mechanism is provided for radially retracting the locking arm (51) when the micro actuator stops driving.

4. The PCS magnetically controlled indwelling tube according to claim 3, characterized in that, The micro actuator and the locking arm (51) are connected by an inclined guide block (52), which is used to convert the axial movement of the actuator of the micro actuator into the radial movement of the locking arm (51).

5. The PCS magnetically controlled indwelling tube according to claim 1, characterized in that, The control module (7) also includes a receiving coil for receiving commands from outside the body via inductive wireless communication.

6. An implantable component, characterized in that, include: The PCS magnetically controlled indwelling tube as described in any one of claims 1 to 5; A medicine box body (1) has a medicine liquid chamber (11) and an instrument chamber (12) inside. The infusion channel (22) is connected to the medicine liquid chamber (11), and the electromagnet channel (21) is connected to the instrument chamber (12). The electromagnet assembly (3), the recycling mechanism (6) and the control module (7) are all located in the instrument chamber (12).

7. A displacement control system for a PCS magnetically controlled indwelling tube, used for displacement control of the PCS magnetically controlled indwelling tube as described in claim 1; characterized in that, include: An external power supply unit (8) includes a power supply electrode (81) inserted from outside the body into the medicine box body (1) and configured to supply power to an electrode connector (71) inside the medicine box body (1); An external control unit is configured to transmit commands to the control module (7) via inductive wireless communication; An external magnetic source is configured to interact with an electromagnetic coil within the electromagnet assembly (3) via a magnetic field.

8. A method for shifting a PCS magnetically controlled indwelling tube, used to control the shifting of the PCS magnetically controlled indwelling tube as described in claim 1; characterized in that, Includes the following steps: Power supply: A power supply electrode (81) is inserted from outside the body into the electrode connector (71) inside the medicine box body (1) to establish a detachable electrical connection; Guidance and deployment: The external control unit sends a command to the control module (7) to supply power to the electromagnetic coil in the electromagnet assembly (3); at the same time, the external magnetic source interacts with the electromagnetic coil to guide the electromagnet assembly (3) to a predetermined position along the electromagnet channel (21); Active locking: When the electromagnet assembly (3) reaches the predetermined position, the external control unit sends a command to the control module (7) to supply power to the electric locking device (5) in the electromagnet assembly (3), thereby activating the electric locking device (5) and locking the electromagnet assembly (3) in the electromagnet channel (21). Displacement control: By interacting with the electromagnetic coil through the external magnetic source, the electromagnet assembly (3) and the end of the catheter (2) are guided to a predetermined position, thereby achieving non-invasive repositioning of the end of the catheter (2); Unlocking and Retrieval: After the non-invasive repositioning of the catheter (2) end is completed, the external control unit sends an instruction to the control module (7) to stop the control module (7) from supplying power to the electric locking device (5) so as to unlock it; when the external magnetic source and external power supply unit (8) are removed, the retrieval mechanism (6) automatically pulls the electromagnet assembly (3) back into the medicine box (1).

9. The shift control method according to claim 8, characterized in that, The guidance and deployment steps and the displacement control steps achieve axial movement and / or rotation of the electromagnet assembly (3) by changing the direction or intensity of the magnetic field of the external magnetic source.

10. The shift control method according to claim 8, characterized in that, The unlocking and recycling step involves automatically pulling back the electromagnet assembly (3) under the mechanical potential energy drive of the reset spring (62) of the recycling mechanism (6).

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