An infusion system for shape memory nickel-titanium alloy rods

Abstract

This invention relates to the field of medical device technology and discloses an infusion system for shape memory nickel-titanium alloy rods. A spiral hose is spirally wound around the shape memory nickel-titanium alloy rod, and both ends of the spiral hose have circulation interfaces. The water outlet of the infusion unit is connected to one end of the spiral hose through a first circulation pipe, and the water return end is connected to the other end of the spiral hose through a second circulation pipe. The infusion unit contains a first and a second liquid storage tank, which are connected to the circulation pipe through corresponding water outlet and return pipes, respectively. The first liquid storage tank contains ice-salt water, and the second liquid storage tank contains 37°C physiological saline. This invention utilizes fluid circulation heat exchange to allow the entire rod to reach the phase change temperature simultaneously, ensuring synchronous deformation. The tension of the alloy rod is evenly transmitted to each screw and spinal segment, avoiding screw overload and aggravation of scoliosis caused by localized deformation, resulting in uniform orthopedic force.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an infusion system for shape memory nickel-titanium alloy rods. Background Technology

[0002] Nickel-titanium alloys are widely used in orthopedic internal fixation implants due to their unique shape memory effect and superelasticity. During surgery, surgeons deform the implant into an easily implantable shape under low temperature (usually using ice-cold saline solution at 0-4°C), then insert it into the body. Body temperature (approximately 37°C) allows it to return to its pre-set shape, achieving locking, compression, and other mechanical functions. Especially in spinal correction surgery, the ability to pre-bend for easy implantation under low temperature and return to its normal state at body temperature makes the correction procedure faster, more accurate, and less strenuous.

[0003] Patent application number 201110220635.9 discloses a temperature-controlled pen-type heater for shape memory alloys, which can be used for point heating of shape memory alloy implants during surgery. During surgery, the heater can directly contact the shape memory alloy, allowing it to quickly and accurately return to its original shape, which is beneficial for surgical procedures. However, this solution has the following drawbacks: First, in spinal surgery, the point heating method makes it impossible for the entire alloy rod to reach the phase change temperature at the same time. The asynchronous deformation means that the tension during the deformation of the alloy rod cannot be evenly transmitted to each screw or spinal segment, which can easily lead to screw overload and worsening of scoliosis due to local deformation first. Secondly, it still requires the use of ice-salt water to control the deformation of the alloy rod. Temperature control is crude and unstable. Soaking the shape memory alloy rod in ice-salt water results in large temperature fluctuations, making it difficult to precisely control the temperature near the phase transition point. This may cause the implant to undergo a phase transition prematurely or delayed during the implantation process, affecting operational safety and the final fixation effect. Third, it is uncontrollable during the operation. Once an abnormality in internal fixation is found, such as loose screws or spinal displacement, the point heating can only be passively stopped, but the tension of the alloy rod cannot be quickly eliminated, which is a high risk. At the same time, it is not possible to achieve tension feedback on the alloy rod and to monitor the internal shape memory stress of the alloy. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an injection system for shape memory nickel-titanium alloy rods to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: An infusion system for shape memory nickel-titanium alloy rods, comprising: Spiral hose, used for spiral winding on shape memory nickel-titanium alloy rod, with circulation ports at both ends of the spiral hose; The injection unit has its outlet end connected to one end of the spiral hose through the first circulation pipe, and its return end connected to the other end of the spiral hose through the second circulation pipe. The injection unit is equipped with a first liquid storage tank and a second liquid storage tank. The first liquid storage tank and the second liquid storage tank are connected to the circulation pipe through corresponding outlet pipe and return pipe, respectively. The first storage tank contains ice-cold saline solution, and the second storage tank contains 37°C physiological saline solution.

[0006] As a further implementation, a connecting sleeve is also included, which is used to fix the shape memory nickel-titanium alloy rod. One end of the connecting sleeve is connected to the end of the spiral hose, the other end is connected to the circulation pipeline, and the other end is connected to different circulation ports on the spiral hose.

[0007] As a further implementation, the connecting sleeve includes a first connecting sleeve and a second connecting sleeve with the same structure. One end of the first connecting sleeve is fixedly connected to one end of the spiral hose, and the other end is connected to the first circulation pipeline. One end of the second connecting sleeve is fixedly connected to the other end of the spiral hose, and the other end is connected to the second circulation pipeline.

[0008] As a further implementation, a first water outlet pipe is provided at the water outlet end of the first liquid storage tank, and a second water outlet pipe is provided at the water outlet pipe of the second liquid storage tank. The first water outlet pipe and the second water outlet pipe are connected to the first circulation pipeline through a three-way structure. The first liquid storage tank is equipped with a first return water pipe at its return water end, and the second liquid storage tank is equipped with a second return water outlet pipe at its return water pipe. The first and second return water pipes are connected to the second circulation pipeline through a T-junction structure.

[0009] As a further implementation, a circulation pump is provided on the first outlet pipe and the second outlet pipe, and a first valve, a second valve, a third valve, and a fourth valve are sequentially installed on the first outlet pipe, the second outlet pipe, the first return pipe, and the second return pipe. The switching of circulation units for different media is realized by opening and closing the valves in combination.

[0010] As a further implementation, pressure sensors are installed on both the first and second circulation pipelines; The liquid storage tank is equipped with a temperature sensor.

[0011] As a further implementation, the liquid storage tank is equipped with a temperature control module, which, together with a temperature sensor, controls the temperature of the medium.

[0012] As a further implementation, a controller is also included, with the infusion host connected to the controller.

[0013] As a further implementation, the controller is provided with an operation interface and a display interface. The display interface displays parameter data, and the operation interface enables the switching of circulating media.

[0014] As a further implementation, the spiral hose is attached to the surface of a shape memory nickel-titanium alloy rod.

[0015] The beneficial effects of the present invention are as follows: 1. The infusion system of this invention utilizes a spiral hose uniformly wound around an alloy rod, which is connected to the infusion host. Due to the shape memory effect of the nickel-titanium alloy rod, which relies on the uniform phase transformation from martensite to austenite, this fluid circulation heat exchange method allows the entire rod to reach the phase transformation temperature simultaneously, ensuring synchronous deformation. The tension of the alloy rod is uniformly transmitted to each screw and spinal segment, avoiding screw overload and aggravation of scoliosis caused by localized deformation, and ensuring uniform orthopedic force.

[0016] 2. During the temperature-controlled deformation of the alloy rod, cold and warm saline circulate within the circulation unit. The infusion unit controls the switching between cold saline and 37°C physiological saline in real time through the temperature control module and temperature sensor. This allows for precise control near the phase transition point, ensuring accurate control of the phase transition process and guaranteeing the surgical outcome.

[0017] 3. Compared to point heating, this invention can achieve dynamic linear heating / constant temperature maintenance, allowing for comprehensive heating of the alloy plate. Simultaneously, it indirectly monitors the orthopedic force through pressure feedback, enabling the alloy rod to reach a preset optimal mechanical state, which point heating cannot achieve. Furthermore, this invention is controllable during surgery. If an internal fixation abnormality is detected (screw loosening, spinal displacement), the fully enclosed system can immediately switch to a low-temperature cycle to rapidly cool the alloy rod and eliminate tension. In contrast, a heating pen can only stop heating and cannot actively cool the rod, posing a higher risk.

[0018] 4. The interring gap of the spiral hose of the present invention can be adapted to screw installation, which can realize full-process temperature control inside the body. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0020] Figure 1 This is a schematic diagram of the overall structure of the infusion system in an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of the infusion host in an embodiment of the present invention; Figure 3 This is a flowchart illustrating the process of an embodiment of the present invention.

[0021] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0022] The components are: 1. Shape memory nickel-titanium alloy rod, 2. Spiral hose, 3. First connecting sleeve, 4. Second connecting sleeve, 5. First circulation pipeline, 51. First outlet pipe, 52. Second outlet pipe, 6. Second circulation pipeline, 61. First return pipe, 62. Second return pipe, 7. Injection host, 71. First storage tank, 72. Second storage tank, 8. Controller. Detailed Implementation

[0023] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0024] Example 1 In a typical embodiment of the present invention, reference is made to Figures 1-3 As shown, an infusion system for shape memory nickel-titanium alloy rods includes a spiral hose 2, connecting sleeves, an infusion host 7, and a controller 8. The spiral hose 2 is used to spirally wind around the shape memory nickel-titanium alloy rod 1. Two connecting sleeves are used to fix the rod at both ends. The infusion host 7 is connected to the connecting sleeves through two sets of circulation pipelines to realize the alternating circulation of cold saline and 37°C physiological saline in the spiral hose 2, thereby achieving temperature control of the shape memory nickel-titanium alloy rod.

[0025] The connecting sleeve includes a first connecting sleeve 3 and a second connecting sleeve 4. The first connecting sleeve 3 and the second connecting sleeve 4 have the same structure and are provided with internal circulation channels for fixing to both ends of the shape memory nickel-titanium alloy rod 1 and communicating with the end of the spiral hose 2.

[0026] The circulation pipeline includes a first circulation pipeline 5 and a second circulation pipeline 6. One end of both the first circulation pipeline 5 and the second circulation pipeline 6 is connected to the injection host 7. The first circulation pipeline 5 serves as the water outlet pipeline of the injection host 7 and also as the water inlet pipeline of the spiral hose 2. The second circulation pipeline 6 serves as the water return pipeline of the injection host 7 and also as the water outlet pipeline of the spiral hose 2.

[0027] In this embodiment, the water outlet of the injection host 7 is connected to the first connecting sleeve 3 through the first circulation pipe 5, and the return water pipe is connected to the second connecting sleeve 4 through the second circulation pipe 6, thereby realizing that the brine can circulate in the circulation loop.

[0028] like Figure 1 As shown, in this embodiment, the connecting sleeve is fixedly connected to the end of the spiral hose, which can limit the spiral hose 2 on the shape memory nickel-titanium alloy rod 1, so that the spiral hose 2 fits against the surface of the shape memory nickel-titanium alloy rod 1.

[0029] As shown in the figure Figure 2As shown, the injection unit 7 is equipped with a first liquid storage tank 71 and a second liquid storage tank 72. The outlets of the first liquid storage tank 71 and the second liquid storage tank 72 are connected to the inlet of the first circulation pipeline 5 through pipes and a tee structure. The return ends of the first liquid storage tank 71 and the second liquid storage tank 72 are connected to the outlet of the second circulation pipeline 6 through pipes and a tee structure.

[0030] Specifically, the first outlet pipe 51 at the outlet end of the first liquid storage tank 71 and the second outlet pipe 52 at the outlet end of the second liquid storage tank 72 are connected to the inlet end of the first circulation pipeline 5 via a T-junction. The return water ends of the first liquid storage tank 71 and the second liquid storage tank 72 are connected to the outlet end of the second circulation pipeline 6 via the first return water pipe 61 and the second return water pipe 62, respectively.

[0031] Understandably, the first storage tank 71 contains ice-cold saline solution, and the second storage tank 72 contains 37°C physiological saline solution.

[0032] Understandably, the first connecting sleeve 3 and the second connecting sleeve 4 are connected to the circulation pipeline and the spiral hose 2 through corresponding interfaces at both ends. The connecting sleeve 3 can be fixed to the alloy rod by clamping, or the connecting sleeve can be sleeved on the alloy rod.

[0033] Both the first outlet pipe 51 and the second outlet pipe 52 are equipped with circulation pumps to provide power. It is understood that after the cold saline and 37°C physiological saline come out of the infusion unit 7, they need to enter the spiral hose 2 through the first circulation pipe 5 and the first connecting sleeve 3, and then return to the infusion unit 7 through the second connecting sleeve 4 and the second circulation pipe 6.

[0034] The circulation path of the ice-salt water in the first storage tank 71 is as follows: first storage tank 71 - first outlet pipe 51 - first connecting sleeve 3 - spiral hose 2 - second connecting sleeve 4 - second circulation pipeline 6 - first return pipe 61 - first storage tank 71. The above path constitutes the low temperature circulation unit.

[0035] The circulation path of the 37°C saline solution in the second reservoir 72 is as follows: second reservoir 72 - second outlet pipe 52 - first connecting sleeve 3 - spiral hose 2 - second connecting sleeve 4 - second circulation pipeline 6 - second return pipe 62 - second reservoir 72. The above path constitutes the heating circulation unit (i.e., body temperature circulation).

[0036] Valves are respectively installed on the first water outlet pipe 51, the second water outlet pipe 52, the first water outlet pipe 51, and the second water return pipe 62. The first valve is installed on the first water outlet pipe 51, the second valve is installed on the second water outlet pipe 52, the third valve is installed on the first water return pipe 61, and the fourth valve is installed on the second water return pipe 62.

[0037] Understandably, both storage tanks are equipped with temperature sensors to monitor the corresponding medium temperature, and the circulation pipeline is equipped with a pressure sensor. The storage tanks also contain a temperature control module. The temperature sensors, in conjunction with the temperature control module, are used to control the temperature of the ice-cold saline and 37°C physiological saline in the two storage tanks respectively, maintaining a stable temperature. The infusion unit 7 is connected to a controller 8, which has an operation interface and a display interface. The display interface shows parameter data, and the operation interface allows for switching of the circulating medium. The display interface shows the medium temperature and pressure in different circulation loops, and the operation interface allows for temperature adjustment. Understandably, both the temperature and pressure sensors are connected to the controller 8, and the temperature control module, in conjunction with the temperature sensors, can control the medium temperature.

[0038] In this embodiment, ice-salt water is passed through the first outlet pipe 51, the first circulation pipe 5, the second circulation pipe 6, and the first return pipe 61 to achieve temperature-controlled deformation of the shape memory nickel-titanium alloy rod 1, controlling the temperature at the phase transition point. Physiological saline at 37°C is then passed through the second outlet pipe 52, the first circulation pipe 5, the second circulation pipe 6, and the second return pipe 62 to heat the shape memory nickel-titanium alloy rod, restoring it to its preset shape.

[0039] When it is necessary to perform temperature-controlled deformation of the shape memory nickel-titanium alloy rod 1, cold brine is introduced into the spiral hose 2 through the first liquid storage tank 71 in the injection host 7. The spiral hose 2 is tightly attached to the surface of the alloy rod, and the cold brine can cool the alloy rod to facilitate the shaping work and relieve the stress on the alloy rod.

[0040] Through the second reservoir 72 of the infusion unit, 37°C physiological saline can be circulated into the spiral tubing 2 to provide a heating medium for the heating circulation unit, which is used to heat the shape memory nickel-titanium alloy rod 1, triggering the shape memory effect to achieve reset deformation. The spiral tubing 2 is a disposable sterile consumable.

[0041] During the switching between the low-temperature circulation unit and the heating circulation unit, the first to fourth valves switch accordingly. For example, when it is necessary to shape the alloy rod, the first and third valves are opened, and the other valves are closed. At this time, the cold brine in the low-temperature circulation unit participates in the circulation, and the spiral hose 2 contains flowing cold brine to facilitate the shaping process.

[0042] When the heating circulation unit needs to be used, the first and third valves are closed, and the second and fourth valves are opened. At this time, the 37°C saline solution in the heating circulation unit participates in the circulation. The spiral tubing 2 contains flowing 37°C saline solution, which helps the shape memory nickel-titanium alloy rod 1 to heat up and trigger the shape memory effect to achieve reset deformation.

[0043] Understandably, when switching between the heating circulation unit and the low-temperature circulation unit, for example, when the low-temperature circulation unit is engaged in the circulation work and the alloy rod is shaped, and it is necessary to switch the heating circulation unit to work, the state is switched through the controller's operation interface. At this time, the first valve is closed, the second valve is opened, the circulation pump on the second outlet pipe 52 is working, the third valve is opened, the fourth valve is closed, and the 37°C physiological saline pushes the cold saline in the circulation loop back to the first storage tank 71 through the third valve. Then the fourth valve is opened and the third valve is closed, and the complete heating circulation unit is engaged in the work.

[0044] The purpose of this setup is to ensure that during state transitions, brine in different states enters the original storage tank. Simultaneously, when switching from the heating circulation unit to the low-temperature circulation unit, the second valve closes, the first valve opens, the circulation pump on the first outlet pipe 51 operates, the fourth valve is open, and the third valve is closed. The cold brine pushes the 37°C physiological saline in the circulation loop, causing it to return to the second storage tank 72 via the fourth valve. After a set time, the fourth valve closes, the third valve opens, and the complete low-temperature circulation unit begins operation. The set time for the state transition of the third and fourth valves is specifically the time it takes for different media in the circulation loop to return to their corresponding storage tanks. This needs to be determined based on parameters such as flow rate and volume.

[0045] Understandably, the above-mentioned state switching cannot guarantee that the two media can circulate completely independently. During the state switching, a small amount of 37°C saline and ice-saline will mix, resulting in short-term temperature fluctuations. Therefore, it is necessary to work together with a temperature control module and a temperature sensor to better control the temperature of the two media.

[0046] Understandably, when temperature-controlled deformation is required, the alloy rod can be quickly cooled by introducing cold saline solution into the spiral hose 2. When the alloy rod is positioned and needs to be repositioned, physiological saline solution is introduced into the spiral hose 2 to heat the alloy rod and restore it to its preset shape.

[0047] Understandably, the process involves first installing the spiral tubing 2 onto the shape memory nickel-titanium alloy rod, then connecting and installing the infusion unit and the corresponding piping structure, and initiating a low-temperature cycle. This means that the alloy rod needs to be shaped into its deformed form under cold conditions using a low-temperature cycle unit. Then, the alloy rod, wrapped with the spiral tubing 2, is implanted into the predetermined position on the posterior aspect of the patient's spine. The rod is then installed into the screw slot, with each screw placed in the gap of the spiral tubing. Specifically, the pedicle screws are passed through the gaps between the spiral tubing rings, screwed into the pedicle, and all screws are tightened to completely fix the position of the alloy rod. Afterward, a heating cycle unit (body temperature cycle) is used to heat the alloy rod, thereby generating orthopedic force. The saline solution in the heating cycle unit is controlled at 37±0.5℃.

[0048] During the process of the alloy rod restoring its preset shape, physiological saline continuously heats the alloy rod, gradually increasing its temperature and causing it to transform from martensitic to austenitic phase. This generates shape memory restoring force, pushing the deformed part of the spine to reposition and deform. Understandably, after the correction is completed, the spiral tubing needs to be removed. If problems occur during the correction process, the emergency cryogenic circulation unit is activated to terminate the correction work.

[0049] Specifically, during the circulation of physiological saline at 37℃, pressure sensors in the circulation loop monitor the pressure in real time. Through the pre-calibrated "pressure change - alloy rod recovery force" curve, the reset force and mechanical working state of the alloy rod are indirectly monitored, providing guidance for the surgical procedure. The controller can adjust the saline flow rate in real time according to a preset pressure threshold, achieving controllable rate heating of the alloy rod, ensuring uniform transmission of the reset force, and avoiding localized stress overload. Understandably, changes in saline flow rate correspond to valve switching times. If the flow rate increases, the delay switching time of the third and fourth valves should be correspondingly shortened.

[0050] During the process of the alloy rod attempting to return from a pre-bent state to a straight state, a bending moment is generated. This bending moment is converted into radial expansion (Poisson effect) and circumferential compression of the rod. The tightly fitted spiral hose will be flattened by the radial expansion / circumferential compression of the rod, reducing the channel volume. This will then transmit the internal medium pressure to the corresponding pressure sensor. The pressure data calibrated before the operation can help the surgeon to judge the mechanical state of the alloy rod in a timely manner during the operation.

[0051] If an internal fixation abnormality (such as screw loosening or spinal displacement) is detected during the heating and repositioning process of the alloy rod, the pressure sensor value will change significantly. At this time, the controller can immediately trigger the emergency cooling program. After the emergency cooling program is activated, the heating circulation unit stops working and the low-temperature circulation unit starts working to quickly cool down the alloy rod. The cold saline continuously circulates, which can quickly relieve the tension of the alloy rod and reduce the temperature of the alloy rod below the martensitic phase transformation temperature within a few seconds, so that it stops shape memory recovery and eliminates the repositioning tension of the alloy rod, avoiding abnormal stress from damaging the spine, screws and surrounding tissues. The surgeon can readjust the screw position and the placement of the alloy rod. After the adjustment is completed, the high-temperature circulation can be restarted to resume the heating and repositioning operation.

[0052] The temperature sensor detects the medium temperature in real time and feeds it back to the controller. Based on the temperature information, the controller uses the temperature control module to control the temperature in real time, ensuring that the medium temperature is within the normal range.

[0053] When the corresponding pressure sensor value reaches the preset target threshold and clinical imaging examination confirms that the spinal repositioning effect meets the standard, controller 8 shuts down the circulation unit, the dual pumps stop working, and the medium stops flowing.

[0054] The surgeon then removes the connecting sleeve and spiral tubing 2, completing the recycling of disposable consumables, while the alloy rod remains in the patient's body to achieve long-term fixation and correction of the spine, thus ending the entire temperature control procedure.

[0055] In the infusion system of this embodiment, the spiral hose is uniformly wound around the alloy rod. Due to the shape memory effect of the nickel-titanium alloy, which relies on the uniform phase transformation from martensite to austenite, this method of using fluid circulation heat exchange allows the entire rod to reach the phase transformation temperature simultaneously, resulting in synchronous deformation. The tension of the alloy rod is evenly transmitted to each screw and spinal segment, avoiding screw overload and aggravation of scoliosis caused by localized deformation, and ensuring uniform orthopedic force.

[0056] Furthermore, the circulation system enables dynamic linear heating / constant temperature maintenance, precisely controlling the phase change process. Pressure feedback indirectly monitors the orthopedic force, allowing the alloy rod to reach a preset optimal mechanical state—something point heating cannot achieve. This solution is also controllable during surgery; if internal fixation abnormalities are detected (screw loosening, spinal displacement), the fully enclosed system can immediately switch to low-temperature circulation to rapidly cool the alloy rod and eliminate tension. In contrast, a heating pen can only stop heating, not actively cool it, posing a higher risk. The inter-ring gaps in the spiral flexible tubing in this example are adaptable to screw installation, enabling full-process temperature control within the body.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A filling system for shape memory nickel-titanium alloy rods, characterized in that, include: Spiral hose, used for spiral winding on shape memory nickel-titanium alloy rod, with circulation ports at both ends of the spiral hose; The injection unit has its outlet end connected to one end of the spiral hose through the first circulation pipe, and its return end connected to the other end of the spiral hose through the second circulation pipe. The injection unit is equipped with a first liquid storage tank and a second liquid storage tank. The first liquid storage tank and the second liquid storage tank are connected to the circulation pipe through corresponding outlet pipe and return pipe, respectively. The first storage tank contains ice-cold saline solution, and the second storage tank contains 37°C physiological saline solution.

2. The infusion system for shape memory nickel-titanium alloy rods according to claim 1, characterized in that, It also includes a connecting sleeve, which is used to fix the shape memory nickel-titanium alloy rod. One end of the connecting sleeve is connected to the end of the spiral hose, the other end is connected to the circulation pipeline, and the other end is connected to different circulation ports on the spiral hose.

3. The infusion system for shape memory nickel-titanium alloy rods according to claim 2, characterized in that, The connecting sleeve includes a first connecting sleeve and a second connecting sleeve with the same structure. One end of the first connecting sleeve is fixedly connected to one end of the spiral hose, and the other end is connected to the first circulation pipeline. One end of the second connecting sleeve is fixedly connected to the other end of the spiral hose, and the other end is connected to the second circulation pipeline.

4. The infusion system for shape memory nickel-titanium alloy rods according to claim 1, characterized in that, The first liquid storage tank is provided with a first water outlet pipe at its water outlet end, and the second liquid storage tank is provided with a second water outlet pipe. The first water outlet pipe and the second water outlet pipe are connected to the first circulation pipeline through a three-way structure. The first liquid storage tank is equipped with a first return water pipe at its return water end, and the second liquid storage tank is equipped with a second return water outlet pipe at its return water pipe. The first and second return water pipes are connected to the second circulation pipeline through a T-junction structure.

5. The infusion system for shape memory nickel-titanium alloy rods according to claim 4, characterized in that, A circulation pump is installed on the first and second outlet pipes. A first valve, a second valve, a third valve, and a fourth valve are sequentially installed on the first outlet pipe, the second outlet pipe, the first return pipe, and the second return pipe. By opening and closing the valves in combination, the circulation units for different media can be switched.

6. A filling system for shape memory nickel-titanium alloy rods according to any one of claims 2, characterized in that, Pressure sensors are installed on both the first and second circulation pipelines; The liquid storage tank is equipped with a temperature sensor.

7. The infusion system for shape memory nickel-titanium alloy rods according to claim 6, characterized in that, The liquid storage tank is equipped with a temperature control module, which, together with a temperature sensor, controls the temperature of the medium.

8. The infusion system for shape memory nickel-titanium alloy rods according to claim 5, characterized in that, It also includes a controller, and the infusion host is connected to the controller.

9. The infusion system for shape memory nickel-titanium alloy rods according to claim 8, characterized in that, The controller is equipped with an operation interface and a display interface. The display interface shows parameter data, and the operation interface enables switching of circulating media.

10. The infusion system for shape memory nickel-titanium alloy rods according to claim 2, characterized in that, The spiral hose is attached to the surface of the shape memory nickel-titanium alloy rod.

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