Flushing device and control method

Abstract

According to the flushing device and the control method, when the flushing device exhausts residual gas in an internal flow channel of a catheter pump, a power part does not drive flushing fluid to flow in the same direction any more, but periodically changes the driving direction, so that the flushing fluid alternately flows in the first direction and the second direction, and the flushing fluid flows in the first direction and the second direction; the flushing fluid alternately flows along the first direction and the second direction to cause the agitation of the flushing fluid in an internal flow channel of the catheter pump, and under the action of the agitation force of the flushing fluid, residual gas in an air trapping area of the internal flow channel also moves along with the fluid and can flow into a flushing fluid pipeline outside the catheter pump along with the flushing fluid, so that the flushing fluid can flow into the catheter pump. Residual gas is filtered out through the gas filter arranged on the flushing fluid pipeline, so that the thoroughness and efficiency of exhausting of the catheter pump can be integrally improved, the flushing device can run automatically, the complexity of operation equipment is reduced, the burden of operators is reduced, the labor input of an operation can be effectively reduced, and the operation efficiency is improved. The operation preparation time is reduced.

Description

Technical Field

[0001] This invention relates to the field of medical technology, and in particular to a rinsing device and control method. Background Technology

[0002] A catheter pump is an interventional blood pump used to support the heart's pumping function. The catheter pump is percutaneously inserted into the heart of the recipient. A drive motor rotates the impeller of the pump, thus enabling the pumping action. The catheter pump consists of a rotor, a drive catheter with a drive shaft inside, and a pump head. The drive motor rotates the rotor and drive shaft, which in turn rotates the impeller inside the pump head to achieve the pumping function. Because the rotating components such as the rotor and drive shaft inside the catheter pump require a certain amount of space, the pump must be pre-filled with liquid to purge air from the internal flow channels before use. This prevents air from entering the body during surgery and endangering the recipient's life.

[0003] However, duct pumps are small in size and have complex internal flow channel structures, including narrow and thin channels. During exhaust, surface tension exists between the bubbles and the inner wall of the flow channel. Larger bubbles, without sufficient impact force, cannot overcome the surface tension to flow through the narrow and thin channels and will eventually become trapped inside the duct pump.

[0004] How to effectively expel the gas trapped in the internal flow channel of the duct pump has always been one of the main issues of concern to those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide a flushing device and control method that can effectively filter out air bubbles in the internal flow channel of a duct pump.

[0006] This application provides a flushing device for filtering out residual gas trapped in the internal flow channels of a duct pump. The duct pump includes a flushing pipeline interface connected to a flushing fluid pipeline. Fluid in the flushing fluid pipeline enters the duct pump through the flushing pipeline interface to flush the internal flow channels of the duct pump. The flushing device includes: A power unit, connected to the flushing fluid pipeline, is used to provide power for the fluid in the flushing fluid pipeline to flow in a first direction and in a second direction; wherein the first direction and the second direction are opposite to the flow direction, the first direction refers to the direction of inflow into the conduit pump, and the second direction refers to the direction of outflow from the conduit pump; A gas filter is installed in the flushing fluid pipeline; During the exhaust process corresponding to the duct pump, the power component periodically changes its driving direction, driving the fluid in the flushing fluid pipeline to flow alternately along the first direction and the second direction, so as to agitate the residual gas out of the duct pump and make it flow through the gas filter for filtration.

[0007] When the flushing device provided in this application is used to vent residual gas from the internal flow channel of the duct pump, the power component no longer drives the flushing fluid to flow in the same direction, but periodically changes the driving direction. In this way, the flushing fluid will flow alternately in the first direction and the second direction. The alternating flow of the flushing fluid in the first direction and the second direction will cause the flushing fluid in the internal flow channel of the duct pump to ripple. Under the action of the ripple force of the flushing fluid, the surface tension of the residual gas can be overcome. The residual gas in the gas trapping area of ​​the internal flow channel will also move with the fluid and leave its initial position. It can then flow with the flushing fluid to the external flushing fluid pipeline of the duct pump. The residual gas is filtered out by the gas filter installed on the flushing fluid pipeline. This can effectively filter out the residual gas inside the duct pump. Moreover, the flushing device can operate automatically, avoiding errors that may be caused by manual operation and the impact of differences in operation between individuals. It reduces the complexity of the operating equipment, reduces the burden on operators, and can effectively reduce the manual input of surgery and the preparation time for surgery. Overall, it improves the thoroughness and efficiency of venting the duct pump.

[0008] In one example, the flushing fluid pipeline includes a first pipeline and a second pipeline, which are connected in parallel between the power unit and the flushing pipeline interface; The gas filter includes a first gas filter and a second gas filter. The first pipeline is provided with the first gas filter, and the second pipeline is provided with the second gas filter. The gas filtration direction of the first gas filter is the same as or opposite to that of the second gas filter.

[0009] In one example, the gas filtration direction of the first gas filter is the first direction, and the gas filtration direction of the second gas filter is the second direction.

[0010] In one example, the flushing fluid pipeline includes a first pipeline and a second pipeline, which are connected in parallel between the power component and the flushing fluid interface; the first pipeline is provided with a first switching valve, and the second pipeline is provided with a second switching valve; the gas filter is provided on the first pipeline and / or the second pipeline; When the power component drives the fluid in the flushing fluid pipeline to flow in the first direction, the first switching valve is in the open state and the second switching valve is in the closed state. When the power component drives the fluid in the flushing fluid pipeline to flow in the second direction, the first switching valve is in the blocking state and the second switching valve is in the opening state.

[0011] In one example, the first switching valve and the second switching valve are one-way valves, with the first switching valve having the first direction of conduction and the second switching valve having the second direction of conduction.

[0012] In one example, the duct pump has a flow channel with a variable diameter region, and the residual gas includes bubbles trapped in the flow channel with a variable diameter region.

[0013] In one example, the internal flow channel of the duct pump includes a liquid chamber, the flushing fluid interface is connected to the liquid chamber, the size of the liquid chamber is different from the size of the flushing pipeline interface, and the flow channel diameter variation region includes the air trapping region formed between the flushing pipeline interface and the liquid chamber.

[0014] In one example, the duct pump includes a rotor structure, a drive shaft, and a drive conduit. The rotor structure drives the drive shaft to rotate, and the drive shaft passes through the drive conduit. The internal flow channel of the duct pump includes a first cavity and a second cavity that are interconnected. The first cavity is connected to the drive conduit, and the rotor structure is housed within the second cavity. The flushing pipeline interface includes a flushing fluid inlet and a flushing fluid outlet. The flushing fluid inlet is connected to the first cavity through a first aperture to form an inlet air-trapping region, and the flushing fluid outlet is connected to the second cavity through a second aperture to form an outlet air-trapping region. The flow channel variable diameter region includes at least one of the inlet trapped air region and the outlet trapped air region.

[0015] In one example, an annular gap is formed between the outer peripheral sidewall of the rotor structure and the sidewall of the second cavity, and an inter-end face gap is formed between the end face of the rotor structure and the end face of the second cavity. The flow channel diameter variation region also includes an air trapping region formed between the annular gap and the inter-end face gap.

[0016] In one example, the flushing fluid pipeline includes a flushing fluid inlet pipeline, a flushing fluid circulation inlet pipe, and a flushing fluid circulation outlet pipe. The flushing fluid inlet pipeline, the flushing fluid circulation inlet pipe, and the flushing fluid circulation outlet pipe are connected by a communicating vessel. The flushing fluid inlet pipeline is connected to a storage device, the flushing fluid circulation inlet pipe is connected to the flushing fluid inlet, and the flushing fluid circulation outlet pipe is connected to the flushing fluid outlet. The power unit includes at least one of an infusion pump and a circulation pump. The infusion pump is connected to the flushing fluid infusion pipeline and is used to pump the flushing fluid in the storage device into the flushing fluid circulation inlet pipe. The circulation pump is connected to the flushing fluid circulation inlet pipe and / or the flushing fluid circulation outlet pipe and is used to drive the flushing fluid to circulate between the flushing fluid circulation inlet pipe, the conduit pump and the flushing fluid circulation outlet pipe.

[0017] In one example, the first driving amount of the power component along the first direction is less than the second driving amount of the power component along the second direction.

[0018] This application provides a control method for a rinsing device, based on the aforementioned rinsing device, the method comprising: The power component is controlled to periodically change its driving direction, driving the fluid in the flushing fluid pipeline to flow alternately along the first direction and along the second direction, so as to agitate the residual gas in the internal flow channel of the conduit pump out of the conduit pump and make it flow through the gas filter for filtration.

[0019] In one example, the gas filtration direction of the gas filter is along the first direction; the first driving amount of the power component along the first direction is less than the second driving amount of the power component along the second direction; The method of controlling the power component to periodically change the driving direction, driving the fluid in the flushing fluid pipeline to flow alternately along the first direction and along the second direction, includes: During the second period of at least one oscillation cycle, the power component is controlled to drive the residual gas through the gas filter in the second direction with the second driving amount; During the first period of the at least one oscillation cycle, the power component is controlled to change the driving direction, and the residual gas that has passed through the gas filter is pumped back into the gas filter along the first direction for filtration with the first driving amount.

[0020] In one example, the flushing fluid pipeline includes a first pipeline and a second pipeline, which are connected in parallel between the power unit and the flushing pipeline interface; The gas filter includes a first gas filter and a second gas filter. The first pipeline is provided with the first gas filter, and the second pipeline is provided with the second gas filter. The gas filtration direction of the first gas filter is the first direction, and the gas filtration direction of the second gas filter is the second direction. The method of controlling the power component to periodically change the driving direction, driving the fluid in the flushing fluid pipeline to flow alternately along the first direction and along the second direction, includes: During the second period of at least one oscillation cycle, the power component is controlled to drive the residual gas through the first gas filter and / or the second gas filter in the second direction, wherein the second gas filter filters out the gas passing through in the second direction; During the first period of the at least one oscillation cycle, the power component is controlled to change the driving direction, and the residual gas that has passed through the first gas filter is pumped back into the first gas filter along the first direction for filtration.

[0021] In one example, the flushing fluid pipeline includes a first pipeline and a second pipeline, which are connected in parallel between the power component and the flushing fluid interface; the first pipeline is provided with a first switching valve, and the second pipeline is provided with a second switching valve. The gas filter is disposed in the first pipeline, and the gas filtration direction of the gas filter is the first direction; The method of controlling the power component to periodically change the driving direction, driving the fluid in the flushing fluid pipeline to flow alternately along the first direction and along the second direction, includes: During the second period of at least one oscillation cycle, the first switching valve is controlled to close, the second switching valve is controlled to open, and the power component is controlled to drive the residual gas to flow along the second pipeline in the second direction to reach the proximal interface side of the first gas filter. During the first period of the at least one oscillation cycle, the second switching valve is controlled to close, the first switching valve is controlled to open, and the power component is controlled to change its driving direction, and the residual gas reaching the proximal interface side is driven to flow along the first pipeline in the first direction, so as to pump the residual gas into the gas filter for filtration.

[0022] In one example, the frequency range of the first-direction flow and the second-direction flow in each oscillation cycle is 10Hz to 20Hz, and the driving amount of the fluid along the second direction in each oscillation cycle is greater than the driving amount of the fluid along the first direction.

[0023] In one example, the conduit pump includes a drive shaft, a drive conduit, and a liquid chamber. The flushing line interface is connected to the liquid chamber, and the drive shaft passes through the liquid chamber and is disposed in the drive conduit. The power components include an infusion pump and a circulation pump. The infusion pump is used to provide power to pump the flushing fluid into the drive conduit, and the circulation pump is used to provide power to form a fluid circulation between the liquid chamber and the flushing fluid line.

[0024] In one example, the method further includes: In response to the start / stop command or speed adjustment command of the duct pump, the drive amount of the infusion pump is reduced, and / or the drive amount of the circulation pump is increased, so as to pump out the air bubbles generated by the rotation of the drive shaft in the liquid chamber from the duct pump and make them flow through the gas filter for filtration.

[0025] In one example, after controlling the driving amount of the infusion pump to decrease and / or the driving amount of the circulation pump to increase in response to a start / stop command or speed regulation command of the conduit pump, the method further includes: After a predetermined running time, the driving amount of the infusion pump is controlled to return to the third driving amount, and / or the driving amount of the circulation pump is controlled to return to the fourth driving amount; wherein, the third driving amount refers to the driving amount before the driving amount of the infusion pump is reduced, and the fourth driving amount refers to the driving amount before the driving amount of the circulation pump is increased.

[0026] The control method of this application is implemented based on the rinsing device, and therefore the control method also has the above-mentioned technical effects of the rinsing device. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the duct pump in a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the flushing device and the conduit pump assembly in a specific embodiment of the present invention; Figure 3 In another specific embodiment of the present invention, the flushing device is assembled with the conduit pump; Figure 4 In another specific embodiment of the present invention, the flushing device is assembled with the conduit pump; Figure 5 This is a schematic diagram of the flushing device and the conduit pump assembly in another specific embodiment of the present invention; Figure 6 This is a schematic diagram of the flushing device and the conduit pump assembly in another specific embodiment of the present invention; Figure 7 This is a schematic diagram of the flushing device and the conduit pump assembly in another specific embodiment of the present invention; Figure 8 for Figure 4 The diagram shows the fluid flow path of the flushing fluid in the flushing fluid pipeline driven by the power component in the flushing device, flowing in the second direction; where gray dots represent fluid. Figure 9 for Figure 4 The diagram shows the fluid flow path of the flushing fluid in the flushing fluid pipeline driven by the power component in the flushing device, flowing in the second direction; where the gray dots in the diagram represent the fluid. Detailed Implementation

[0028] Regarding the issue of gas discharge from the internal flow channel of the discharge duct pump mentioned in the background art, this application has conducted extensive research and found that during the pre-charge and gas discharge process of the current duct pump, some gas may become trapped in the dead zone of the internal flow channel and cannot be discharged. In particular, residual gas often remains trapped in the inlet and outlet areas where the duct pump connects to the flushing fluid pipeline and is difficult to discharge.

[0029] Currently, the main method for venting a tubular pump is manual: after drawing a certain amount of medium liquid with a syringe, the medium liquid is quickly injected through the inlet of the handle, and the residual gas inside is eliminated by the rapid water flow. However, this method has the following disadvantages: (1) Manual operation is prone to errors; (2) The rinsing effect is affected by the operator's skill level; (3) Additional operators and surgical procedures are required; (4) Increase the time for surgical preparation.

[0030] The main technical problem addressed in this application is how to effectively remove residual gas from the internal flow channel of the duct pump with high efficiency.

[0031] The features and exemplary embodiments of various aspects of this application will now be described in detail. In order to make the purpose, technical solution and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Please refer to Figures 1 to 7 , Figure 1 This is a schematic diagram of the duct pump in a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the flushing device and the conduit pump assembly in a specific embodiment of the present invention; Figure 3 In another specific embodiment of the present invention, the flushing device is assembled with the conduit pump; Figure 4 In another specific embodiment of the present invention, the flushing device is assembled with the conduit pump; Figure 5 This is a schematic diagram of the flushing device and the conduit pump assembly in another specific embodiment of the present invention; Figure 6 This is a schematic diagram of the flushing device and the conduit pump assembly in another specific embodiment of the present invention; Figure 7 This is a schematic diagram of the flushing device and the conduit pump assembly in another specific embodiment of the present invention.

[0033] Please refer to Figures 1 to 7The catheter pump 1000 in this embodiment includes a rotor structure 2046, a drive shaft 202, a drive catheter 201, and a pump head 205. In use, the drive assembly 100 is typically located outside the subject (who may be human), while the pump head 205 is inserted into the subject's body, specifically in the left ventricle, to assist the heart in pumping blood and reduce the burden on the heart. The pump head 205 can assist the left ventricle in pumping blood into the aorta. The pump head 205 can also assist the right ventricle. Of course, it is not excluded that the pump head 205 can be applied to other scenarios; for example, the pump head can also be inserted into blood vessels or other organs.

[0034] In this embodiment, the drive assembly 100 is mainly used to provide power for the pump head 205 to pump, enabling the pump head 205 to pump and suction liquids (such as blood). In one specific embodiment, the drive assembly 100 can be a motor; however, the drive assembly 100 can also be other components capable of performing the above functions. Taking a motor as an example, please refer to... Figure 2 It is understood that the power of the motor is transmitted to the impeller 2051 of the pump head 205 through the drive shaft 202. The transmission between the motor and the drive shaft 202 can be carried out by magnetic coupling. The motor can be connected to the drive duct 201 and the near end of the drive shaft 202 through the coupler 204. The far end of the drive duct 201 is connected to the pump head 205. The drive shaft 202 passes through the drive duct 201 and the far end of the drive shaft 202 is connected to the impeller 2051 of the pump head 205.

[0035] In this embodiment, the pump head 205 can be configured to switch between a radially folded state and a radially extended state. When the pump head 205 is placed in the subject's body through a blood vessel, it can be constrained to the radially folded state to reduce discomfort caused to the subject during placement. Once the pump head 205 reaches the designated placement position, the constraint force on the pump head 205 is released, allowing it to be in the radially extended state for normal operation. The specific structure of the pump head 202 is not described in detail herein; please refer to the current documentation.

[0036] In one embodiment, the conduit pump 1000 further includes a flushing line interface 2040, which is connected to a flushing fluid line 240 to inject flushing fluid into the internal flow channels of the conduit pump 1000. That is, fluid in the flushing fluid line 240 enters the conduit pump through the flushing line interface 240 to flush and vent air from the internal flow channels of the conduit pump 1000. Specifically, the internal flow channels of the conduit pump 1000 include a liquid chamber 204c, which is filled and vented by the flushing fluid. This article continues to describe the technical solution and its effects using the example of the flushing line interface 2040 being located on the coupler 204. Please refer to... Figure 2Specifically, the coupler 204 includes a housing 2045, a coupling magnet (not shown in the figure), bushings, and the aforementioned rotor structure 2046. Typically, there are two bushings: a first bushing 2043 and a second bushing 2044, which are respectively supported at the two axial ends of the rotor structure 2046. The two bushings are fixed inside the housing 2045, and the coupling magnet and rotor structure 2046 are fixedly connected, with the rotor structure 2046 rotatably supported by the bushings. The coupling magnet can generate a coupling force with the magnet fixed on the drive assembly 100. When the drive assembly 100 rotates, under the action of magnetic coupling, the power of the drive assembly 100 is transmitted to the rotor structure 2046 in the coupler 204. The rotor structure 2046 can rotate. When the rotor structure 2046 rotates, it drives the drive shaft 202 connected to it to rotate. The drive shaft 202 drives the impeller 2051 in the pump head 205 to rotate, so as to pump blood. That is to say, the rotor structure 2046 drives the drive shaft 202 to rotate, the drive shaft 202 drives the impeller 2051 to rotate, and the impeller 2051 rotates to pump blood.

[0037] In this embodiment, the flushing pipe interface 2040 is located on the housing 2045. In one example, the internal flow channel (such as the liquid chamber described above) of the housing 2045 includes a first cavity 20451 and a second cavity 20452 that are interconnected. The first cavity 20451 is connected to the drive conduit 201, and the rotor structure 2046 is housed inside the second cavity 20452. An annular gap 204b is formed between the outer peripheral sidewall of the rotor structure 2046 and the sidewall of the second cavity 20452, and an inter-end face gap 204a is formed between the end face of the rotor structure 2046 and the end face of the second cavity 20452. The flushing pipe interface 2040 is connected to the liquid chamber, and the drive shaft 202 passes through the liquid chamber 204c and is inserted into the drive conduit 201. The liquid chamber 204c may include the inner cavity of the first cavity 20451, the annular gap 204b, and the inter-end face gap 204a.

[0038] The duct pump 1000 is provided with a flushing pipe interface 2040 on at least the first cavity 20451. The flushing pipe interface 2040 is connected to the flushing fluid pipe 240. Fluid in the flushing fluid pipe 240 enters the internal flow channel of the duct pump 1000 through the flushing pipe interface 2040 to vent air from the internal flow channel of the duct pump 1000. The internal flow channel of the duct pump 1000 includes at least one of the inner cavity of the first cavity 20451, the annular gap 204b, and the end face gap 204a. Figures 2 to 4As shown, the first chamber 20451 of the duct pump 1000 is provided with a flushing pipe interface 2040. The flushing fluid in the flushing fluid pipeline 240 enters the first chamber 20451 through the flushing pipe interface 2040. Part of the flushing fluid enters the interior of the drive conduit 201 and can flow along the drive conduit 201 to the pump head 205. The other part flows along the drive shaft 202 to the end face gap 204a and the annular gap 204b. In the normal flushing mode, the flushing fluid circulates through the inner cavity of the first chamber 20451, the annular gap 204b and the end face gap 204a, which can effectively cool the rotor structure 2046.

[0039] Combination Figures 2 to 7 As described above, the internal flow channel of the duct pump 1000 has a flow channel diameter change region. The flow velocity and pressure in this region typically change, leading to residual air bubbles and trapped gas. The residual gas within the duct pump 1000 mainly consists of air bubbles trapped in the flow channel diameter change region. For example, the size of the liquid chamber 204c differs from the size of the flushing pipe interface 2040, and the flow channel diameter change region includes the trapped gas region formed between the flushing pipe interface 2040 and the liquid chamber 204c. The flow channel diameter change region also includes the trapped gas region formed between the annular gap 204b and the end face gap 204a. Furthermore, as... Figures 5 to 7 As shown, the flushing pipeline interface includes a flushing fluid inlet 2041 and a flushing fluid outlet 2042. The flushing fluid inlet 2041 is connected to the first cavity 20451 through a first aperture to form an inlet gas-trapping region, and the flushing fluid outlet 2042 is connected to the second cavity 20452 through a second aperture to form an outlet gas-trapping region. The flow channel diameter change region also includes an inlet gas-trapping region and an outlet gas-trapping region. The following section of this application provides a flushing device and control method for eliminating residual gas trapped in the internal flow channel of the duct pump 1000, wherein the residual gas includes air bubbles trapped in at least one location in the aforementioned flow channel diameter change region.

[0040] Please refer to this again. Figure 2 The flushing device provided in this application embodiment includes a power unit 300 and a gas filter 243. The power unit 300 is connected to the flushing fluid pipeline 240 and is used to provide power for the fluid in the flushing fluid pipeline 240 to flow in a first direction and a second direction, wherein the first direction S1 and the second direction S2 are opposite in flow direction, the first direction S1 refers to the direction of inflow into the conduit pump, and the second direction S2 refers to the direction of outflow from the conduit pump. The power unit 300 can be a pump or other components that can satisfy the above functions.

[0041] In this embodiment, a gas filter 243 is disposed in the flushing fluid pipeline 240, and the gas filter 243 is capable of filtering out gas from the fluid flowing through it. Normally, fluid can only be filtered out when passing through the gas filter 243 in a specified direction; it will not be filtered out when passing through the gas filter in the opposite direction. Figure 2 The gas filtration direction of the gas filter 243 is the first direction S1. For the specific structure of the gas filter 243 and the principle of gas filtration, please refer to current technology; this will not be elaborated upon here.

[0042] On the one hand, the flushing device provided in this application embodiment can meet the pre-charging stage requirements of the conduit pump 1000. For example, the power component 300 drives the fluid in the flushing fluid pipeline 240 to flow along the first direction S1 for a predetermined time, and the flushing fluid will continuously be injected into the internal flow channel of the conduit pump 1000 to discharge the gas in the internal flow channel of the conduit pump 1000. When the flushing fluid passes through the gas filter 243, the internal gas can be filtered out. The pre-charging stage can be understood as the conventional flushing mode of the flushing device. On the other hand, the flushing device in this application embodiment can also eliminate residual gas caused by bubbles or other factors due to the change in diameter of the internal flow channel of the conduit pump. As mentioned above, the residual gas in the internal flow channel of the conduit pump 1000 is mainly trapped in the flow channel change area, and the main location of the flow channel change area can be referred to the above description. The following will describe in detail the control method of the flushing device when removing residual gas in the internal flow channel of the conduit pump 1000.

[0043] In the embodiments of this application, Figure 2 The control method for the flushing device shown includes: The control power unit 300 periodically changes its driving direction, driving the fluid in the flushing fluid pipeline 240 to flow alternately along the first direction S1 and the second direction S2, thereby agitating the residual gas in the internal flow channel of the duct pump 1000 out of the duct pump 1000 and causing it to flow through the gas filter 243 for filtration. In other words, during the exhaust process corresponding to the duct pump 1000, the power unit periodically changes its driving direction, which can agitate the residual gas in the internal flow channel of the duct pump out of the duct pump and filter it through the gas filter 243.

[0044] When the flushing device provided in this application is used to vent residual gas from the internal flow channel of the duct pump, the power component 300 no longer drives the flushing fluid to flow in the same direction, but periodically changes the driving direction. In this way, the flushing fluid will flow alternately along the first direction S1 and the second direction S2. The alternating flow of the flushing fluid along the first direction S1 and the second direction S2 will cause the flushing fluid in the internal flow channel of the duct pump 1000 to ripple. Under the action of the ripple force of the flushing fluid, the residual gas in the gas trapping area of ​​the internal flow channel will also move with the fluid, leave its initial position, and flow with the flushing fluid to the external flushing fluid pipeline of the duct pump 1000. The residual gas is filtered out by the gas filter 243 set on the flushing fluid pipeline 240. This can effectively filter out the residual gas inside the duct pump 1000. Moreover, the flushing device can operate automatically, avoiding errors that may be caused by manual operation and the impact of differences in operation between individuals. It reduces the complexity of the operating equipment, reduces the burden on operators, and can effectively reduce the manual input of surgery and the preparation time for surgery. Overall, it improves the thoroughness and efficiency of venting the duct pump 1000.

[0045] In some embodiments, the power unit 300 may be a peristaltic pump, which drives fluid flow by squeezing the flushing fluid line 240 through its rollers. The device can provide power for the fluid in the flushing fluid line 240 to flow in a first direction and a second direction by controlling the rotation direction of the peristaltic pump. When using a peristaltic pump for pre-charging and venting, the peristaltic pump is difficult to provide a large instantaneous flow rate to flush away residual gas. Therefore, by controlling the peristaltic pump to rotate periodically in both directions, the flushing fluid in the internal flow channel of the conduit pump 1000 can be agitated. Under the action of the agitation force of the flushing fluid, the residual gas is driven out of the conduit pump.

[0046] by Figure 2Taking the gas filtration direction of the gas filter 243 along the first direction S1 as an example, it should be noted that "gas filtration direction along the first direction S1" means that the gas in the flushing liquid can only be filtered out by the gas filter 243 when the flushing liquid passes through the gas filter along the first direction S1. If it passes through the gas filter 243 along the second direction S2, the gas in the flushing liquid cannot be filtered out by the gas filter 243. In the above control method, the first driving amount of the power component 300 along the first direction S1 is less than the second driving amount of the power component 300 along the second direction S2. The first driving amount in each oscillation cycle is less than the second driving amount. In this way, the overall movement direction of the flushing liquid is towards the gas filter side. Thus, within a certain oscillation cycle, the residual gas in the conduit pump 1000 can be driven along the second direction S2 to the side of the gas filter 243 away from the flushing liquid interface, and then, when switching directions, it can pass through the gas filter 243 along the first direction S1 and be filtered out. By reasonably setting the operating parameters of the power component 300 along the first direction S1 and the operating parameters along the second direction S2, the required first driving amount and second driving amount can be obtained. When the power component 300 is a pump, the first driving quantity can be determined by setting parameters such as the pump speed and working time along the first direction S1; similarly, the second driving quantity can be determined by setting parameters such as the pump speed and working time along the second direction S2.

[0047] Thus, the control method described above, which involves "controlling the power unit 300 to periodically change its driving direction, driving the fluid in the flushing fluid pipeline to flow alternately along the first direction S1 and the second direction S2," specifically includes: During the second period of at least one oscillation cycle, the control power unit 300 drives the residual gas through the gas filter in the second direction S2 with a second driving amount; During the first period of at least one oscillation cycle, the control power unit 300 changes the driving direction and pumps the residual gas that has passed through the gas filter 243 back into the gas filter along the first direction S1 for filtration with a first driving amount.

[0048] In this embodiment, by controlling the second driving amount of the power component 300 along the second direction S2 to be greater than the first driving amount along the first direction S1, the flow path of the flushing fluid along the second direction S2 is greater than the flow path along the first direction S1. This allows residual gas in the conduit pump 1000 to be guided to the flushing fluid pipeline 240, and the agitated residual gas gradually moves towards the gas filter 243. Finally, the residual gas is eliminated as it flows through the gas filter 243 along the first direction S1. In this embodiment, by simply controlling the operating parameters of the power component 300, residual gas in the conduit pump 1000 can be gradually guided to the gas filter 243 and filtered out by the gas filter 243. For existing flushing devices, no new components need to be added. Simply controlling the operating parameters of the power component 300 already installed on the flushing fluid pipeline in the original flushing device is sufficient to eliminate residual gas inside the conduit pump 1000, with virtually no increase in operating costs. Furthermore, the control logic of this control method is relatively simple and the response speed is relatively fast.

[0049] The following provides several specific embodiments of the flushing device. The specific structure of the conduit pump 1000 in each embodiment is basically the same. Please refer to the above description and they will not be described one by one.

[0050] Please refer to Figure 3 In this embodiment, the flushing fluid pipeline 240 of the flushing device includes a first pipeline 241 and a second pipeline 242, which are connected in parallel between the power component 300 and the flushing pipeline interface 2040. The gas filter includes a first gas filter 2431 and a second gas filter 2432. The first gas filter 2431 is disposed in the first pipeline 241, and the second gas filter 2432 is disposed in the second pipeline 242. The gas filtration direction of the first gas filter 2431 is opposite to that of the second gas filter 2432. The arrows marked on the first gas filter 2431 and the second gas filter 2432 represent their respective gas filtration directions; that is, the gas filtration direction of the first gas filter 2431 is the first direction S1, and the gas filtration direction of the second gas filter 2432 is the second direction S2. Figure 3 As can be seen, when the flushing fluid flows through the first gas filter 2431 in the first direction S1, the first gas filter 2431 can filter out the gas flowing through the fluid inside it. However, if the flushing fluid flows through the first gas filter 2431 in the second direction S2, the first gas filter 2431 cannot filter out the gas flowing through the fluid inside it. Similarly, the second gas filter 2432 can only filter out the gas in the fluid passing through it in the second direction S2, and does not filter out the gas in the fluid passing through it in the first direction S1.

[0051] Specifically, the control method described above, which involves "controlling the power unit 300 to periodically change its driving direction, driving the fluid in the flushing fluid pipeline to flow alternately along the first direction S1 and the second direction S2," specifically includes: During the second period of at least one oscillation cycle, the control power unit 300 drives the residual gas to pass through the first gas filter 2431 or the second gas filter 2432 along the second direction S2, or simultaneously through the first gas filter 2431 and the second gas filter 2432, wherein the second gas filter 2432 filters out the gas passing through along the second direction S2. During the first period of at least one oscillation cycle, the control power component 300 changes the driving direction and pumps the residual gas that has passed through the first gas filter 2431 back into the first gas filter along the first direction S1 for filtration.

[0052] In this embodiment, the first gas filter 2431 and the second gas filter 2432 are connected in parallel and the gas filtration directions are opposite. When the power component 300 drives the flushing liquid to flow in the first direction S1, the first gas filter 2431 can filter the gas passing through the flushing liquid inside it. When the power component 300 drives the flushing liquid to flow in the second direction S2, the second gas filter 2432 can filter the gas passing through the flushing liquid inside it. That is, no matter which direction the power component 300 drives the flushing liquid to move, it can be filtered through a gas filter. In this way, air bubbles can be filtered out through gas filters in at least two pipelines, which effectively improves the upper limit of degassing and the gas filtration effect. Moreover, within one oscillation cycle, there is a gas filter in each driving direction with the same filtration direction as the driving direction. The resistance encountered by the fluid when passing through the gas filter in the filtration direction is small. Therefore, the resistance encountered by the flushing liquid during alternating oscillation will be reduced, which can improve the exhaust effect.

[0053] Of course, the gas filtration direction of the first gas filter 2431 and the second gas filter 2432 can also be the same, and the specific control method is the same as... Figure 2 The control method for the flushing device shown is the same, and will not be described in detail here. Figure 2 In contrast, connecting two or more gas filters in parallel to the power unit 300 and the flushing pipe interface 2040 increases the flow rate of flushing fluid through the gas filters per unit time to a certain extent, which is beneficial to improving the exhaust effect and exhaust capacity.

[0054] Please refer to Figure 4 In another embodiment, the flushing fluid pipeline of the flushing device also includes a first pipeline 241 and a second pipeline 242, which are connected in parallel between the power unit 300 and the flushing fluid interface 2040; Figure 3 The difference between the embodiments shown is that, Figure 4The first pipeline 241 is equipped with a first switching valve 244, and the second pipeline 242 is equipped with a second switching valve 245; the gas filter 243 is installed on the first pipeline 241, and the gas filtration direction of the gas filter 243 is the first direction S1.

[0055] When the power unit 300 drives the fluid in the flushing fluid pipeline to flow in the first direction S1, the first switch valve 244 is in the open state and the second switch valve 245 is in the closed state. When the power unit 300 drives the fluid in the flushing fluid pipeline to flow in the second direction S2, the first switch valve 244 is in the blocking state and the second switch valve 245 is in the conducting state.

[0056] Accordingly, the control methods may specifically include: During the second period of at least one oscillation cycle, the first switching valve 244 is closed, the second switching valve 245 is opened, and the power unit 300 is driven by the control unit to drive the residual gas along the second pipeline 242 in the second direction S2 to reach the proximal interface side of the gas filter 243; please refer to Figure 8 , Figure 8 The diagram shows the path of the flushing fluid driven by the power unit to flow in the second direction, with the arrows indicating the flow direction of the flushing fluid. Figure 8 The flushing device shown further illustrates a first tee 501 and a second tee 502. The proximal ends of the first pipe 241 and the second pipe 242 are connected to the power unit 300 via the second tee 502, and the distal ends of the first pipe 241 and the second pipe 242 are connected to the flushing fluid interface of the conduit pump 1000 via the first tee 501. The tee enables parallel connection between the first pipe and the second pipe, resulting in a simple structure.

[0057] During the first period of at least one oscillation cycle, the second switching valve 245 is closed, the first switching valve 244 is opened, and the power unit 300 is changed in drive direction. This drives the residual gas reaching the proximal interface side to flow along the first pipeline 241 in the first direction S1, pumping the residual gas into the gas filter 243 for filtration. Please refer to... Figure 9 , Figure 9 The diagram shows the path of the flushing fluid driven by the power unit to flow in a first direction, with arrows indicating the flow direction of the flushing fluid.

[0058] In other words, when the fluid in the flushing fluid pipeline flows in the first direction S1, the second pipeline 242 is disconnected through the second switch valve 245, and the fluid can only pass through the first pipeline 241 to filter out the gas inside the flushing fluid. When the fluid in the flushing fluid pipeline flows in the second direction S2, the first pipeline 241 is disconnected through the first switch valve 244, and the fluid can only pass through the second pipeline. This avoids the fluid from entering the bubble filter with a large pressure difference along the filtration direction in the reverse direction (reverse filtration direction), reduces fluid resistance, and improves the exhaust effect.

[0059] Of course, a gas filter can also be further installed on the second pipeline 242. The gas filtration direction of the bubble filter on the second pipeline 242 can be along the second direction S2. The control of the first switching valve 243 and the second switching valve 244 can be coordinated with... Figure 4 The same embodiment is shown. In this way, the fluid can undergo gas filtration through both the first pipe 241 and the second pipe 242, improving the gas filtration effect and capacity.

[0060] In the above embodiments, both the first switching valve 244 and the second switching valve 245 can be one-way valves. The conduction direction of the first switching valve 244 is the first direction S1, and the conduction direction of the second switching valve 245 is the second direction S2. One-way valves allow fluid flowing in their conduction direction to pass through while preventing fluid flowing in the opposite direction. Thus, the connection or disconnection of the first and second pipelines can be achieved without complex mechanical structures or electrical control methods, resulting in a relatively simple system structure.

[0061] Of course, the first switching valve 244 and the second switching valve 245 can also be electrically controlled valves, which can be controlled to open and close by electrical signals.

[0062] In the control methods described above, the frequency range of the flow in the first direction S1 and the second direction S2 in each oscillation cycle is 10Hz to 20Hz. That is, the oscillation frequency of the power component 300 can be any value within this range, such as 10Hz, 12Hz, 15Hz, 18Hz, etc. When the oscillation frequency is within this range, the residual gas inside the conduit pump 1000 is more easily agitated into the flushing fluid pipeline. By maintaining the flow rate of fluid along the second direction S2 greater than the flow rate along the first direction S1 in each oscillation cycle, the residual gas is driven to move towards the flushing fluid pipeline and is driven to pass through the gas filter for filtration during reversal.

[0063] Please refer to further information. Figures 5 to 7 The power unit 300 further includes, but is not limited to, at least one of an infusion pump 302 and a circulation pump 301, wherein the infusion pump 302 is used to provide power to pump the flushing fluid into the drive conduit 201, and the circulation pump 301 is used to provide power to form a fluid circulation between the liquid chamber 204c and the flushing fluid line. Figures 5 to 7The flushing pipeline interface of the conduit pump 1000 includes a flushing fluid inlet 2041 and a flushing fluid outlet 2042. The flushing fluid pipeline includes a flushing fluid inlet line 240C, a flushing fluid circulation inlet line 240A, and a flushing fluid circulation outlet line 240B. The flushing fluid inlet line 240C, the flushing fluid circulation inlet line 240A, and the flushing fluid circulation outlet line 240B are connected by a communicating vessel. The flushing fluid inlet line 240C is connected to the storage device 400, the flushing fluid circulation inlet line 240A is connected to the flushing fluid inlet 2041, and the flushing fluid circulation outlet line 240B is connected to the flushing fluid outlet 2042. The inlet pump 30... 2. Connected to the flushing fluid inlet pipe 240C, it is used to pump the flushing fluid in the storage device 400 to the flushing fluid circulation inlet pipe 240A, and then to the internal flow channel of the conduit pump 1000 and into the drive conduit 201, thereby removing air from the drive conduit 201 and preventing air from entering; the circulation pump 301 is connected to the flushing fluid circulation inlet pipe 240A and / or the flushing fluid circulation outlet pipe 240B, and is used to drive the flushing fluid to circulate between the flushing fluid circulation inlet pipe 240A, the conduit pump 1000 and the flushing fluid circulation outlet pipe 240B, so as to circulate and cool the internal flow channel of the conduit pump 1000.

[0064] In the normal flushing mode, the circulation pump 301 and the infusion pump 302 operate simultaneously, both driving the flushing fluid to flow in the first direction. Usually, the rotation speed of the infusion pump 302 is lower than that of the circulation pump 301. The smaller the rotation speed of the infusion pump 302, the smaller the driving force, which ensures that the amount of flushing fluid entering the subject's body is minimized. The rotation speed of the circulation pump 301 is larger, and the driving force is correspondingly larger, which can promptly remove the heat from components such as the rotor structure 2046. That is, the high-speed circulation of the flushing fluid in the flushing fluid pipeline driven by the circulation pump 301 cools the rotating components such as the rotor structure 2046 in the cooling conduit pump.

[0065] in Figure 5 The control method for agitating residual gas in the duct pump 1000 as shown in the embodiment can be compared with... Figure 2 Basically the same, Figure 6 The control method can be with Figure 3 Basically the same, Figure 7 The control method can be with Figure 4 They are essentially the same. Optionally, the power component that periodically changes the driving direction in the control method is at least one of the circulating pump 301 or the infusion pump 302, but this application embodiment does not limit this.

[0066] But with Figure 2 and Figure 4 compared to, Figures 5 to 7 The power unit 300 includes an injection pump 302 and a circulation pump 301, which can be controlled individually or in coordination, improving the flexibility of the flushing device control.

[0067] In another possible implementation, since the infusion pump 302 is mainly used to provide power to pump the flushing fluid into the drive conduit 201, the power component that periodically changes the drive direction is the circulation pump 301. The drive direction of the infusion pump 302 can remain unchanged. This allows the trapped air in the flow channel inside the conduit pump 1000 to be discharged by changing the drive direction of the circulation pump 301 without affecting the flushing and venting of the drive conduit 201, thus preventing air from entering the other side of the drive conduit 201.

[0068] from Figures 5 to 7 As can be seen from the diagram, the aforementioned communicating vessel can be a buffer pipe 246. The diameter of the buffer pipe 246 is larger than that of the flushing fluid circulation outlet pipe 240B and the flushing fluid circulation inlet pipe 240A. The outlet of the flushing fluid inlet pipe 240C is connected to the buffer pipe 246. Because the buffer pipe 246 has a relatively large diameter, the flushing fluid from the flushing fluid inlet pipe first flows into the buffer pipe 246 and then into the flushing fluid circulation inlet pipe 240A, thus providing a certain buffering effect. Similarly, the flushing fluid from the flushing fluid circulation outlet pipe 240B first flows into the buffer pipe 246 and then into the flushing fluid circulation inlet pipe 240A.

[0069] After the residual gas inside the catheter pump 1000 is filtered out using the control method described above, the catheter pump 1000 can be inserted into the subject's body. During the insertion process, the flushing device can be restored to the normal flushing mode, which is the mode in which the power component 300 drives the flushing fluid into the catheter pump 1000 along the first direction S1 for flushing. After the catheter pump 1000 is inserted, it can be started to pump blood. When the catheter pump 1000 is started, the drive shaft 202 rotates rapidly. The rotation of the drive shaft 202 in the flushing fluid may cause small bubbles to be generated in the liquid chamber 204c, or the residual gas in the liquid chamber 204c may be broken into small bubbles by the rapidly rotating component. These small bubbles will have reduced surface tension and will flow out from the flushing fluid outlet 2042 through the cooling circulation loop and be filtered by the gas filter under the drive of the circulation pump 301. Similarly, when the rotation speed of the catheter pump 1000 changes, small bubbles may also be generated in the liquid chamber.

[0070] Although the small air bubbles generated above can be safely removed through the cooling circulation loop, in order to further prevent individual small air bubbles from entering the drive catheter 201 and thus the heart with the flow of flushing fluid, the control method of this application further includes: In response to a start / stop command or speed adjustment command from the duct pump 1000, the drive amount of the infusion pump 302 is reduced, and / or the drive amount of the circulation pump 301 is increased, so as to pump out the air bubbles generated by the rotation of the drive shaft 202 in the liquid chamber (mainly inside the first chamber) from the duct pump 1000 and make them flow through the gas filter for filtration.

[0071] In other words, when the working state of the catheter pump 1000 changes, the driving amount of the infusion pump 302 can be reduced (e.g., the speed of the infusion pump is reduced) or the driving amount of the circulation pump 301 can be increased (e.g., the speed of the circulation pump 301 is increased), or both the driving amount of the infusion pump 302 and the driving amount of the circulation pump 301 can be reduced. In this way, without changing the original pumping direction of the infusion pump 302 and the circulation pump 301, the small air bubbles in the liquid chamber can be safely driven into the flushing fluid pipeline, and finally filtered out by the gas filter, thus preventing the small air bubbles from entering the subject's body.

[0072] The purpose of reducing the driving force of the infusion pump 302 is to reduce the power of the flushing fluid in the fluid chamber to flow to the driving catheter 201. While reducing this power, the circulation pump 301 continues to work, so that small air bubbles can be extracted from the fluid chamber 204c in time, thereby preventing small air bubbles from entering the driving catheter 201 and entering the heart.

[0073] Similarly, the driving force of the aforementioned boosting circulation pump 301 is to increase the power of the flushing fluid circulation in the liquid chamber 204c, thereby enabling the small air bubbles to be extracted from the liquid chamber 204c in a timely manner with greater driving force, thus preventing the small air bubbles from entering the driving catheter 201 and entering the heart.

[0074] If the driving force of the infusion pump 302 is reduced while the driving force of the circulation pump 301 is increased, a better effect on the removal of small air bubbles can be achieved.

[0075] In one specific embodiment, after controlling the driving amount of the infusion pump 302 to decrease and / or the driving amount of the circulation pump 301 to increase in response to a start / stop command or speed adjustment command of the conduit pump 1000, the control method further includes: After a predetermined running time (during which small air bubbles in the liquid chamber are filtered out), the driving quantity of the infusion pump 302 is restored to the third driving quantity, and / or the driving quantity of the circulation pump 301 is restored to the fourth driving quantity; wherein, the third driving quantity refers to the driving quantity before the driving quantity of the infusion pump 302 is reduced, and the fourth driving quantity refers to the driving quantity before the driving quantity of the circulation pump 301 is increased. The third and fourth driving quantities can also be understood as the driving quantities of the infusion pump 302 and the circulation pump 301 under normal flushing mode.

[0076] The preset time is mainly based on the filtering out of small air bubbles in the liquid chamber. Those skilled in the art can set it reasonably according to the specific delivery pump 1000. After the small air bubbles in the liquid chamber are filtered out, the driving amount of the infusion pump 302 is restored to the state before it was reduced, and the driving amount of the circulation pump 301 is restored to the driving amount before it was increased. In this way, without manual operation, the delivery pump 1000 can automatically restore to the state before it was reduced through the above control method, thus meeting the subsequent working requirements of the delivery pump 1000.

[0077] This application embodiment also provides an application for... Figures 5 to 7 The method for controlling the flushing device of the ventricular assist device shown includes control steps for each flushing stage.

[0078] Phase 1 (Pre-charge phase, corresponding to the regular flushing mode): In response to a flushing command, a third driving quantity controls the infusion pump to pump flushing fluid in a first direction, and a fourth driving quantity controls the circulation pump to pump flushing fluid in the first direction. The flow direction of both the infusion and circulation pumps is the first direction. The third driving quantity indicates the flow rate of flushing fluid entering the drive conduit (and subsequently into the target object), and is a relatively small, safe value. The fourth driving quantity indicates the flow rate that forms a fluid circulation between the liquid chamber and the flushing fluid pipeline. The fourth driving quantity is significantly higher than the third driving quantity, thereby maintaining high-speed circulation to cool the inner cavity of the conduit pump.

[0079] The pre-charging stage can expel most of the gas in the interventional pump, but there may be residual gas in the trapped gas zone inside the interventional pump, so the second stage begins.

[0080] The second stage (the stage of removing trapped energy, corresponding to a special oscillation-based energy removal pattern): In response to the oscillation flushing command, the infusion pump and / or circulation pump are controlled to periodically change their drive direction, driving the fluid in the flushing fluid pipeline to flow alternately along a first direction and along a second direction, so as to agitate the residual gas in the internal flow channel of the duct pump out of the duct pump and make it flow through the gas filter for filtration.

[0081] In one possible implementation, the circulating pump is controlled to periodically change its drive direction, driving the fluid in the flushing fluid line to flow alternately along a first direction and a second direction, thereby agitating residual gas in the internal flow channel of the duct pump out of the duct pump and causing it to flow through a gas filter for filtration. While the circulating pump reciprocates, the infusion pump remains stopped or vibrates synchronously.

[0082] In the second stage, the bubbles are agitated and filtered by a bubble filter.

[0083] After the trapped air is expelled by vibration, the catheter pump can be inserted into the body. At this point, vibration is not needed. The flushing device needs to be restored to the normal flushing mode, and we need to wait for the catheter pump to be inserted into the body, which is the third stage below: The third stage (catheter pump intervention stage, corresponding to the conventional flushing mode) In response to the end of the oscillating flushing, the pumping method resumes controlling the infusion pump to pump flushing fluid in the first direction with a third driving force, and controlling the circulation pump to pump flushing fluid in the first direction with a fourth driving force. Of course, the driving forces of the infusion pump and circulation pump in this stage can be the same as in the first stage, or they can be different, but in the same direction.

[0084] Once the catheter pump intervention is complete (the catheter pump reaches the designated position), you can prepare to start the catheter pump and proceed to the following fourth stage.

[0085] The fourth stage (the duct pump start-up stage, corresponding to the small bubble elimination mode). When the intervention pump starts, an intermediate transition flushing mode is set, namely the microbubble elimination mode mentioned above. In this mode: The injection pump and circulation pump do not change the pumping direction; their flow direction remains the same, but their flow rates will change. This can reduce the injection flow rate of the injection pump and increase the circulation flow rate of the circulation pump.

[0086] That is, in response to the start command of the conduit pump, the drive amount of the infusion pump is controlled to decrease (which can be reduced to the fifth drive amount), and the reduced drive amount (the fifth drive amount) is used to control the infusion pump to pump flushing fluid in the first direction; and / or, the drive amount of the circulation pump is controlled to increase (which can be increased to the sixth drive amount), and the increased drive amount (the sixth drive amount) is used to control the circulation pump to pump flushing fluid in the first direction, so as to draw out the air bubbles generated by the rotation of the drive shaft in the liquid chamber from the conduit pump and make them flow through the gas filter for filtration.

[0087] Specifically, the driving amount of the infusion pump is reduced from the third driving amount to the fifth driving amount, and / or the driving amount of the circulation pump is increased from the fourth driving amount to the sixth driving amount, so as to pump out the air bubbles generated by the rotation of the drive shaft in the liquid chamber from the conduit pump and make them flow through the gas filter for filtration.

[0088] When the catheter pump starts / stops (the pre-filling and venting steps are completed when the catheter pump starts, but flushing continues), an intermediate transition flushing sequence is added. During normal flushing, the flow rate of the infusion pump in the flushing pump is relatively low (to ensure that the amount of flushing fluid entering the body is relatively small), while the flow rate of the circulation pump is relatively high (for high-speed circulation and cooling). To reduce the probability of small air bubbles entering the heart, a transition flushing sequence with a target duration (not limited to a specific duration) is designed. During the transition phase, the flow rate of the infusion pump is further reduced, and / or the flow rate of the circulation pump is further increased. This can reduce the flow rate of flushing fluid into the body through the catheter, or increase the flow rate of the circulation loop, allowing more small air bubbles to flow into the circulation loop, thereby preventing them from entering the interventional pathway. After the target duration, the normal flushing procedure is automatically resumed.

[0089] After the fourth stage, the rinsing device returns to the normal rinsing mode and enters the fifth stage described below.

[0090] Phase 5 (Pump Operation Phase): In response to the end of the microbubble elimination mode, the pumping of flushing fluid is resumed with the third driving amount controlling the infusion pump to pump along the first direction, and the circulation pump is controlled with the fourth driving amount to pump flushing fluid along the first direction. Similarly, the driving amounts of the infusion pump and circulation pump in this stage can be the same as in the first stage, or they can be different, but in the same direction.

[0091] The duct pump continues to run until it is shut down, proceeding to the following sixth stage.

[0092] Phase 6 (Pump stop phase, corresponding to microbubble elimination mode): Similar to the control mode of the fourth stage mentioned above, in response to the stop command of the delivery pump, the drive amount of the infusion pump is reduced, and / or the drive amount of the circulation pump is increased, so as to pump out the air bubbles generated by the rotation of the drive shaft in the liquid chamber from the delivery pump and make them flow through the gas filter for filtration.

[0093] The operation of the rinsing device in each of the above rinsing stages ensures the safety of the entire duct pump operation and prevents air bubbles from entering the target object.

[0094] This application also provides a ventricular assist device, which includes the aforementioned catheter pump 1000, drive assembly 100, control device, and flushing device, among other components. The control device is used to control the actions of each actuator in the ventricular assist device, and the control device can be a physical component such as a console.

[0095] This application also provides a control device, which can also execute the control method of the above-described rinsing device. That is, the control device has a control unit configured to execute the above-described control method to control the various components in the rinsing device. The control device can be an electronic device, such as a console.

[0096] Furthermore, embodiments of this application also provide a storage medium, specifically a computer-readable storage medium, which can be a non-volatile computer-readable storage medium. Examples include, but are not limited to: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), portable compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0097] In this embodiment of the application, a computer-readable storage medium stores executable instructions, which are configured to execute the control method of the rinsing device described above when triggered for execution.

[0098] In addition, this application also provides a computer program product that, when run on a computer, causes the computer to execute the control method of the rinsing device described in any of the above claims.

[0099] In the description of this application, it should be noted that, in the embodiments of this application, the terms "distal" and "proximal" are relative to the clinician operating the ventricular assist device. The term "proximal" refers to the portion relatively close to the clinician, and "distal" refers to the portion relatively far from the clinician. The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0100] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixed connection" refers to a connection where the relative positional relationship remains unchanged after the connection.

[0101] The directional terms used in the embodiments of this application, such as "inner" and "outer," are merely for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. Furthermore, unless otherwise stated in this application, "multiple" as used in this application refers to two or more.

[0102] In the description of embodiments of this application, the term "comprising" or any other variations thereof is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0103] The flushing device and control method provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A rinsing device, characterized in that, The flushing device is used to filter out residual gas trapped in the internal flow channel of the duct pump. The duct pump includes a flushing pipeline interface, which is connected to a flushing liquid pipeline. Fluid in the flushing liquid pipeline enters the duct pump through the flushing pipeline interface to flush the internal flow channel of the duct pump. The flushing device includes: A power unit, connected to the flushing fluid pipeline, is used to provide power for the fluid in the flushing fluid pipeline to flow in a first direction and in a second direction; wherein the first direction and the second direction are opposite to the flow direction, the first direction refers to the direction of inflow into the conduit pump, and the second direction refers to the direction of outflow from the conduit pump; A gas filter is installed in the flushing fluid pipeline; During the exhaust process corresponding to the duct pump, the power component periodically changes its driving direction, driving the fluid in the flushing fluid pipeline to flow alternately along the first direction and the second direction, so as to agitate the residual gas out of the duct pump and make it flow through the gas filter for filtration.

2. The rinsing device as described in claim 1, characterized in that, The flushing fluid pipeline includes a first pipeline and a second pipeline, which are connected in parallel between the power component and the flushing pipeline interface. The gas filter includes a first gas filter and a second gas filter. The first pipeline is provided with the first gas filter, and the second pipeline is provided with the second gas filter. The gas filtration direction of the first gas filter is the same as or opposite to that of the second gas filter.

3. The rinsing device as described in claim 2, characterized in that, The gas filtration direction of the first gas filter is the first direction, and the gas filtration direction of the second gas filter is the second direction.

4. The rinsing device as described in claim 1, characterized in that, The flushing fluid pipeline includes a first pipeline and a second pipeline, which are connected in parallel between the power component and the flushing fluid interface; the first pipeline is equipped with a first switching valve, and the second pipeline is equipped with a second switching valve; the gas filter is installed on the first pipeline and / or the second pipeline; When the power component drives the fluid in the flushing fluid pipeline to flow in the first direction, the first switching valve is in the open state and the second switching valve is in the closed state. When the power component drives the fluid in the flushing fluid pipeline to flow in the second direction, the first switching valve is in the blocking state and the second switching valve is in the opening state.

5. The rinsing device as described in claim 4, characterized in that, The first switching valve and the second switching valve are one-way valves, the first switching valve is in the first direction, and the second switching valve is in the second direction.

6. The flushing apparatus according to any one of claims 1 to 5, characterized in that, The internal flow channel of the duct pump has a flow channel diameter change region, and the residual gas includes bubbles trapped in the flow channel diameter change region.

7. The rinsing device as described in claim 6, characterized in that, The internal flow channel of the duct pump includes a liquid chamber, the flushing fluid interface is connected to the liquid chamber, the size of the liquid chamber is different from the size of the flushing pipeline interface, and the flow channel diameter change region includes the air trapping region formed between the flushing pipeline interface and the liquid chamber.

8. The rinsing device as claimed in claim 6, characterized in that, The duct pump includes a rotor structure, a drive shaft, and a drive conduit. The rotor structure drives the drive shaft to rotate, and the drive shaft passes through the drive conduit. The internal flow channel of the duct pump includes a first cavity and a second cavity that are interconnected. The first cavity is connected to the drive conduit, and the rotor structure is housed within the second cavity. The flushing pipeline interface includes a flushing fluid inlet and a flushing fluid outlet. The flushing fluid inlet is connected to the first cavity through a first aperture to form an inlet air-trapping region, and the flushing fluid outlet is connected to the second cavity through a second aperture to form an outlet air-trapping region. The flow channel variable diameter region includes at least one of the inlet trapped air region and the outlet trapped air region.

9. The rinsing device as claimed in claim 8, characterized in that, An annular gap is formed between the outer peripheral sidewall of the rotor structure and the sidewall of the second cavity, and an inter-end face gap is formed between the end face of the rotor structure and the end face of the second cavity. The flow channel diameter change region also includes an air trapping region formed between the annular gap and the inter-end face gap.

10. The rinsing device as claimed in claim 8, characterized in that, The flushing fluid pipeline includes a flushing fluid inlet pipeline, a flushing fluid circulation inlet pipe, and a flushing fluid circulation outlet pipe. The flushing fluid inlet pipeline, the flushing fluid circulation inlet pipe, and the flushing fluid circulation outlet pipe are connected by a communicating vessel. The flushing fluid inlet pipeline is connected to a storage device. The flushing fluid circulation inlet pipe is connected to the flushing fluid inlet. The flushing fluid circulation outlet pipe is connected to the flushing fluid outlet. The power unit includes at least one of an infusion pump and a circulation pump. The infusion pump is connected to the flushing fluid infusion pipeline and is used to pump the flushing fluid in the storage device into the flushing fluid circulation inlet pipe. The circulation pump is connected to the flushing fluid circulation inlet pipe and / or the flushing fluid circulation outlet pipe and is used to drive the flushing fluid to circulate between the flushing fluid circulation inlet pipe, the conduit pump and the flushing fluid circulation outlet pipe.

11. The flushing apparatus according to any one of claims 1 to 10, characterized in that, The first driving amount of the power component along the first direction is less than the second driving amount of the power component along the second direction.

12. A control method for a rinsing device, characterized in that, Based on the rinsing device of claim 1, the method includes: The power component is controlled to periodically change its driving direction, driving the fluid in the flushing fluid pipeline to flow alternately along the first direction and along the second direction, so as to agitate the residual gas in the internal flow channel of the duct pump out of the duct pump and make it flow through the gas filter for filtration. Preferably, the gas filtration direction of the gas filter is along the first direction; the first driving amount of the power component along the first direction is less than the second driving amount of the power component along the second direction; The method of controlling the power component to periodically change the driving direction, driving the fluid in the flushing fluid pipeline to flow alternately along the first direction and along the second direction, includes: During the second period of at least one oscillation cycle, the power component is controlled to drive the residual gas through the gas filter in the second direction with the second driving amount; During the first period of the at least one oscillation cycle, the power component is controlled to change the driving direction, and the residual gas that has passed through the gas filter is pumped back into the gas filter along the first direction for filtration with the first driving amount; Preferably, the flushing fluid pipeline includes a first pipeline and a second pipeline, wherein the first pipeline and the second pipeline are connected in parallel between the power component and the flushing pipeline interface; The gas filter includes a first gas filter and a second gas filter. The first pipeline is provided with the first gas filter, and the second pipeline is provided with the second gas filter. The gas filtration direction of the first gas filter is the first direction, and the gas filtration direction of the second gas filter is the second direction. The method of controlling the power component to periodically change the driving direction, driving the fluid in the flushing fluid pipeline to flow alternately along the first direction and along the second direction, includes: During the second period of at least one oscillation cycle, the power component is controlled to drive the residual gas through the first gas filter and / or the second gas filter in the second direction, wherein the second gas filter filters out the gas passing through in the second direction; During the first period of the at least one oscillation cycle, the power component is controlled to change the driving direction, and the residual gas that has passed through the first gas filter is pumped back into the first gas filter along the first direction for filtration. Preferably, the flushing fluid pipeline includes a first pipeline and a second pipeline, the first pipeline and the second pipeline being connected in parallel between the power component and the flushing fluid interface; the first pipeline is provided with a first switching valve, and the second pipeline is provided with a second switching valve; The gas filter is disposed in the first pipeline, and the gas filtration direction of the gas filter is the first direction; The method of controlling the power component to periodically change the driving direction, driving the fluid in the flushing fluid pipeline to flow alternately along the first direction and along the second direction, includes: During the second period of at least one oscillation cycle, the first switching valve is controlled to close, the second switching valve is controlled to open, and the power component is controlled to drive the residual gas to flow along the second pipeline in the second direction to reach the proximal interface side of the first gas filter. During the first period of the at least one oscillation cycle, the second switching valve is controlled to close, the first switching valve is controlled to open, and the power component is controlled to change the driving direction, and the residual gas reaching the proximal interface side is driven to flow along the first pipeline in the first direction, so as to pump the residual gas into the gas filter for filtration. Preferably, the frequency range of the first-direction flow and the second-direction flow in each oscillation cycle is 10Hz to 20Hz, and the driving amount of the fluid along the second direction in each oscillation cycle is greater than the driving amount of the fluid along the first direction. Preferably, the conduit pump includes a drive shaft, a drive conduit, and a liquid chamber. The flushing pipeline interface is connected to the liquid chamber. The drive shaft passes through the liquid chamber and is installed in the drive conduit. The power components include an infusion pump and a circulation pump. The infusion pump is used to provide power to pump the flushing fluid into the drive conduit, and the circulation pump is used to provide power to form a fluid circulation between the liquid chamber and the flushing fluid pipeline. Preferably, the method further includes: In response to the start / stop command or speed adjustment command of the duct pump, the drive amount of the infusion pump is reduced, and / or the drive amount of the circulation pump is increased, so as to pump out the air bubbles generated by the rotation of the drive shaft in the liquid chamber from the duct pump and make them flow through the gas filter for filtration. Preferably, after controlling the driving amount of the infusion pump to decrease and / or control the driving amount of the circulation pump to increase in response to the start / stop command or speed adjustment command of the conduit pump, the method further includes: After a predetermined running time, the driving amount of the infusion pump is controlled to return to the third driving amount, and / or the driving amount of the circulation pump is controlled to return to the fourth driving amount; wherein, the third driving amount refers to the driving amount before the driving amount of the infusion pump is reduced, and the fourth driving amount refers to the driving amount before the driving amount of the circulation pump is increased.

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