CN116328173A - Monitoring catheter, monitoring system and method for assisting heart in pumping blood - Google Patents

Abstract

The present application relates to a monitoring catheter for assisting heart pumping. The improvement is that the monitoring catheter includes: an inflow channel, which is a tubular body with a through hole in the tube wall; an outflow channel, connected to the proximal end of the inflow channel , is a tubular body provided with a through hole on the pipe wall; the impeller device is arranged in the outflow channel; the sensor is arranged on the impeller device; the fluid enters from the inflow channel, and the fluid flows out from the outflow channel through the impeller device; When flowing out, the impeller device can release the rotary pressure generated by the fluid, so that the sensor can sense the measured information and output data information.

Description

A monitoring catheter, monitoring system and method for assisting heart pumping

technical field

The invention relates to the technical field of medical devices, in particular to a monitoring catheter for assisting heart pumping, a monitoring system and a method.

Background technique

Heart failure is mainly due to systolic and diastolic insufficiency, which makes the venous blood pump out of the heart insufficient power, unable to perfuse enough arterial blood, resulting in abnormal cardiac blood circulation. Among them, left heart failure is particularly common. In the early stage of left heart failure treatment, drugs are usually used for treatment. When the symptoms are severe in the late stage of left heart failure, surgical implantation of a pacemaker is required for intervention. The left ventricular assist device is an effective means to alleviate severe heart failure. It is implanted into the heart through the femoral artery, which can pump blood from the left ventricle into the aorta and assist the left ventricle to complete blood circulation. Compatible with percutaneous mechanical circulatory support devices commonly used in clinical practice: such as intra-aortic balloon counterpulsation. Compared with the extracorporeal membrane oxygenator, the left ventricular assist system catheter is easy to operate, with low risk and small wound, and can complete the operation in a short time to restore the heart pumping blood. In most cardiac interventional operations, Doppler ultrasound is a common method to detect blood flow, so as to calculate the blood flow velocity through the transmission and reception of ultrasound.

In the blood pumping work of the left ventricular assist system catheter, the specific blood flow and blood flow velocity can only be reflected by Doppler ultrasound. The use of ultrasound to detect blood flow requires experienced sonographers, and more accurate results can only be obtained after repeated operations. When the catheter rotates or stalls abnormally, the Doppler ultrasound cannot provide timely feedback on the current operating status of the catheter due to more blood flow interference when the heart pumps blood.

Contents of the invention

This application aims to solve the technical problems existing in the prior art. For this reason, the embodiment of the present application provides a monitoring catheter, a monitoring system and a monitoring method for assisting the heart to pump blood, which can monitor the blood flow changes in the heart in real time through the monitoring device connected to the heart assist system catheter, and judge whether the catheter can pump normally. Blood, timely detection of thrombus caused by high-speed rotation of the catheter or stall caused by other reasons such as service life, significantly improved the safety and accuracy of heart failure surgery.

The present invention relates to a monitoring catheter for assisting heart pumping. The improvement is that the monitoring catheter includes:

The inflow passage is a tubular body provided with through holes on the pipe wall;

The outflow channel, connected to the proximal end of the inflow channel, is a tubular body with through holes provided on the tube wall;

an impeller device arranged in the outflow channel;

a sensor arranged on the impeller device;

The fluid enters from the inflow channel, and the fluid flows out from the outflow channel through the impeller device; when the fluid flows out, the impeller device can release the rotary pressure generated by the fluid, so that the sensor can sense the measured information, Carry out data information output.

Preferably, the impeller device includes:

The base is a cylinder;

the shaft core is arranged coaxially with the base;

The blade is arranged on the outer surface of the shaft core; the circumscribed circle area of the blade is smaller than the cross-sectional area of the base;

The outer wall of the impeller is an annular body; it is coaxially connected to the base;

A notch for installing a sensor is provided on the outer wall of the impeller.

Preferably, the blade includes a helical sector formed by axially rotating on the outer surface of the shaft core.

Preferably, the monitoring catheter for assisting heart pumping further includes: a connecting tube for connecting the inflow channel and the outflow channel, and a developing ring is arranged on the connecting tube.

Preferably, the connecting pipe is an elbow.

Preferably, the monitoring catheter further includes: a connecting catheter, which is a tube, connected to the proximal end of the impeller device.

Preferably, the connecting conduit includes:

Connect the inner cavity of the catheter and coaxially connect with the impeller device;

A hinge wire is arranged in the lumen of the connecting catheter;

The outer cavity of the connecting catheter is arranged coaxially with the inner cavity of the connecting catheter;

The sensor wire is arranged in the tube wall of the outer lumen of the connecting catheter, and is used for connecting with the sensor.

Preferably, the sensors include: pressure sensors, temperature sensors, rotational speed sensors and flow sensors.

The present application also relates to a monitoring system for assisting heart pumping, the improvement of which is that the monitoring system includes: the above-mentioned monitoring catheter for assisting heart pumping;

A data receiving port, connected to the proximal end of the connecting catheter, for receiving signals;

The monitoring device is electrically connected with the monitoring catheter for assisting the heart to pump blood, and is used for monitoring signal information. The present application also relates to a method for monitoring blood pumping of the auxiliary heart, which is used in the above-mentioned monitoring system for pumping blood of the auxiliary heart. The monitoring catheter is placed into the left ventricle through the femoral artery; before the impeller device is started, the monitoring device obtains the monitoring data threshold; after the impeller device is started, the monitoring device obtains the actual monitoring data; the actual monitoring data is combined with When the actual monitoring data is not within the range of the monitoring data threshold, it is judged that the monitoring catheter is in an abnormal working state; when the actual monitoring data fluctuates within the range of the monitoring data threshold, then It is judged that the monitoring catheter is in a normal working state.

Compared with prior art, the beneficial effect of the present invention is:

The monitoring catheter for assisting the heart to pump blood provided by the present invention has the advantages of simple structure, convenient operation, safety and high efficiency, especially when performing pressure monitoring based on assisting the heart to pump blood, real-time monitoring of the blood in the blood pumping work can be realized without additional means. Blood pressure, to judge the operation status of the catheter.

The monitoring catheter and monitoring system for assisting heart pumping provided by this application can not only monitor the change of blood flow in the heart in real time, judge whether the catheter can pump blood normally, but also detect in time the thrombus caused by the high-speed rotation of the catheter or other reasons such as service life. It can significantly improve the safety and accuracy of heart failure surgery; pressure sensors can also be replaced by temperature sensors, speed sensors, flow sensors, etc., for different implementation scenarios including but not limited to the heart, blood vessels, intestines, pulmonary veins, Pulmonary artery and other different tissue parts of the human body.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. in:

Fig. 1 is a schematic diagram of a monitoring catheter according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of a monitoring system according to an embodiment of the present invention;

Fig. 3 is a schematic diagram of an inflow channel according to an embodiment of the present invention;

Fig. 4 is a schematic front view of an inflow channel according to an embodiment of the present invention;

Fig. 5 is a schematic diagram of an outflow channel according to an embodiment of the present invention;

Fig. 6 is a schematic front view of an outflow channel according to an embodiment of the present invention;

Fig. 7 is a schematic left view of an outflow channel according to an embodiment of the present invention;

Fig. 8 is a schematic diagram of an impeller according to an embodiment of the present invention;

Fig. 9 is a schematic front view of an impeller according to an embodiment of the present invention;

Figure 10 is a schematic left view of an impeller according to an embodiment of the present invention;

Figure 11 is a schematic diagram of impeller assembly according to an embodiment of the present invention;

Fig. 12 is a schematic left view of impeller assembly according to an embodiment of the present invention;

Fig. 13 is a schematic diagram of a connecting conduit according to an embodiment of the present invention;

Among them, the inflow channel 10, the transvalvular elbow 20, the developing ring 21, the outflow channel 30, the shaft core 31, the sensor 32, the impeller device 33, the connecting catheter 40, the connecting catheter outer cavity 41, the sensor wire 42, the connecting catheter inner cavity 43 , hinge wire 44, monitor 50, catheter front section 60, data receiving port 70, hose 80.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below, obviously, the described embodiments are only some of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention.

In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", " The orientations or positional relationships indicated by "top", "bottom", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation, so they cannot be understood as Limitations on the Invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense, for example, it can be fixedly connected or detachably connected; it can be directly connected or indirectly connected through intermediate parts, for ordinary A skilled person can understand the specific meanings of the above terms according to specific situations.

In the field of interventional medical devices, the end of a medical device implanted in the human or animal body that is closer to the operator is generally called the "proximal end", and the end that is farther from the operator is called the "distal end". Principles define the "proximal" and "distal" ends of any component of a medical device. "Axial" generally refers to the length direction of the medical device when it is being transported, and "radial" generally refers to the direction perpendicular to the "axial" of the medical device, and the "axis" of any part of the medical device is defined according to this principle to" and "radial".

The present invention will be described in detail below with reference to the accompanying drawings and examples. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

Heart failure is mainly due to systolic and diastolic insufficiency, which makes the venous blood pump out of the heart insufficient power, unable to perfuse enough arterial blood, resulting in abnormal cardiac blood circulation. Among them, left heart failure is particularly common. In the early stage of left heart failure treatment, drugs are usually used for treatment. When the symptoms are severe in the late stage of left heart failure, surgical implantation of a pacemaker or heart transplantation is required for intervention. However, the supply of heart transplants is in short supply and cannot meet the needs of patients. Therefore, a left ventricular assist device is usually used as an effective means to alleviate severe heart failure. It is implanted into the heart through the femoral artery, which can pump blood from the left ventricle into the aorta and assist the left ventricle to complete blood circulation. Compared with percutaneous mechanical circulatory support devices commonly used in clinical practice: such as intra-aortic balloon counterpulsation and extracorporeal membrane oxygenator, the left ventricular assist system catheter is easy to operate, with low risk and small wound, and the operation can be completed in a short time Resume heart pumping. In most cardiac interventional operations, Doppler ultrasound is a common method to detect blood flow, so as to calculate the blood flow velocity through the transmission and reception of ultrasound.

In the blood pumping work of the left ventricular assist system catheter, the specific blood flow and blood flow velocity can only be reflected by Doppler ultrasound. The use of ultrasound to detect blood flow requires experienced sonographers, and more accurate results can only be obtained after repeated operations. When the catheter rotates or stalls abnormally, the Doppler ultrasound will not be able to provide timely feedback on the current operating status of the catheter due to more blood flow interference when the heart pumps blood.

Existing heart pumping auxiliary catheters do not have the ability to monitor the working blood pressure of pumping blood in real time. The existing Doppler ultrasound technology for testing blood flow and blood velocity requires the support of a professional ultrasound team, and its operation is complicated, the training period is long, and the test results are inaccurate. Therefore, the monitoring catheter for assisting heart pumping provided by the present invention has simple structure, convenient operation, safety and high efficiency. When performing pressure monitoring based on assisting heart pumping, real-time monitoring of pumping blood can be realized without additional means. The blood flow and blood pressure during work can be used to judge the operation status of the catheter. It can monitor the blood flow changes in the heart in real time, judge whether the catheter is pumping blood normally, and timely detect the thrombus caused by the high-speed rotation of the catheter or the stall caused by other reasons such as service life, which significantly improves the safety and accuracy of heart failure surgery.

Specifically, as shown in FIG. 1 , the present invention relates to a monitoring catheter for assisting heart pumping. The improvement is that the monitoring catheter for assisting heart pumping includes an inflow channel 10 connected in sequence, a transvalvular elbow 20 , an outflow channel 30 , and a connecting conduit 40 .

Specifically, the inflow channel 10 is a tubular body, the length of which is not limited; it includes a first tube wall and a first through hole provided on the first tube wall for fluid to flow in.

Specifically, the shape and size of the first through hole are not limited, and can be circular, elliptical, polygonal, or irregular in shape, as long as the through hole is formed through the pipe wall; the number of the first through hole is not limited , one or more than one can be used to achieve the function of allowing fluid to enter the inflow channel.

Preferably, as shown in Figures 3 and 4, in a preferred embodiment of the present application, in order to increase the blood flow entering the inflow channel 10, the through hole is designed as a rectangular notch extending axially along the tubular body, And a plurality of notches are uniformly arranged on the first pipe wall. Preferably, the width side of the rectangular notch can be adjusted to be arc-shaped, so that the notch is more rounded and does not damage the blood vessel wall.

At the same time, in order to facilitate the placement of the monitoring catheter in the blood vessel without damaging the blood vessel wall, chamfers are provided on the distal end surface of the inflow channel 10 . Preferably, the distal end port of the inflow channel 10 is designed to be smaller than its proximal end port, so as to facilitate the placement of the monitoring catheter.

As shown in FIG. 1 , in some embodiments, the distal end of the inflow channel 10 is connected with an elastic and naturally curved hose 80 . In order to avoid damage to tissues and organs, the distal end of the hose 80 is made of flexible material, and the distal end is curled in a natural state, and generally adopts a hollow tubular structure, and the monitoring catheter is assisted to enter the human body through a guide wire, such as the left ventricle of the heart , and its curled shape does not normally fold, twist, or slip within the left ventricle.

The outflow channel 30 is a tubular body, the length of which is not limited, and is connected to the proximal end of the inflow channel 10; it includes a second tube wall and a second through hole provided on the second tube wall for blood to flow out;

Specifically, the shape and size of the second through hole are not limited, and can be circular, elliptical, polygonal, or irregular in shape, as long as the second through hole is penetrated to form a through hole; As restrictions, one or more than one can be used to allow blood to flow out from the outflow channel.

Preferably, as shown in FIG. 5 to FIG. 7, in a preferred embodiment of the present application, in order to increase the blood flow flowing out from the outflow channel 30, and at the same time, in order to avoid subsequent interference with the operating state of the sensor due to excessive blood flow Therefore, a rectangular through hole is arranged in the middle of the outflow channel 30 along the axial direction of the tubular body, and a plurality of through holes are uniformly arranged on the second tube wall. In order to make the surface of the outflow channel 30 smooth, the above-mentioned rectangular through hole should be provided with rounded corners. In order to facilitate the connection of the outflow channel 30 with other devices, the distal port of the outflow channel 30 is smaller than its proximal port.

The impeller device 33 is coaxially arranged in the outflow channel;

The impeller device includes: a base, blades and a shaft core. Specifically, the shape of the shaft core is not limited, and it can be regarded as a rotation shaft coaxially arranged with the outflow channel 30 , which may be a columnar body. As shown in Figures 8 to 10, in a preferred embodiment of the present application, the mandrel used is a strip-shaped body, and its cross-section is a three-pointed star structure, specifically assuming that a full circle is equally divided by three rays starting from the center of the circle at the same time There are three parts, and the trident star structure is a strip structure formed by extending the three rays along the axis. The shape of the blades is also not limited, it can be a plurality of uniformly arranged fan-like blades arranged radially along the surface of the shaft core, preferably 2-4, and multiple blades can be coplanar in the radial direction They can also be arranged separately in the axial direction, as long as the rotational pressure exerted by the impeller device on the blood can be released.

Wherein, the blade rotates around the axial direction of the shaft core on the outer surface of the shaft core to form a spiral sector, and when the shaft core rotates axially, it can drive the blades to rotate together so as to release the rotational pressure exerted by the impeller device on the blood. Specifically, the blade may be a helical fan surface formed by the rotation of a single blade, or a fan surface formed by the rotation of multiple blades. In one of the preferred embodiments of the present application, the two blades extend axially on the surface of the shaft core from different initial positions along the same rotation direction. Since the shaft core has a three-pointed star structure, the blades and the shaft core are relatively engaged. The effect can make the connection between the blade and the shaft core more firm.

The impeller device also includes the outer wall of the impeller,

Specifically, the outer wall of the impeller is a tubular body, which is coaxially connected to the other end of the base, that is, arranged in the direction opposite to the blade. The diameter of the outer wall of the impeller needs to match the diameter of the base, so as to ensure that the impeller device can be put into the outflow channel 30 . A notch is also provided on the outer wall of the impeller for placing the sensor. Preferably, in order to obtain better sensing data, the size of the outer wall of the impeller is the same as that of the base, so that the sensor is more sensitive to the external environment during use and can obtain more accurate detection data. The location and number of sensors are not limited. In order to detect more accurately, the sensors are evenly arranged on the outer wall of the impeller.

The motor is arranged in the hollow part formed by the outer wall of the impeller, and is connected with the shaft core to provide the power of the impeller device.

As shown in Figures 11 and 12, when the outflow channel 30 is assembled with the impeller device, it is necessary to ensure that the sensor is located in the outer wall of the impeller, and the second through hole of the outflow channel 30 cooperates with the radial direction of the blade to ensure that when the blood flows out, the sensor will not It receives the interference of blood, and at the same time, it can monitor various data when the blood flows out.

As shown in FIG. 13 , the monitoring catheter also includes a connecting catheter 40 , which is connected to the proximal end of the impeller device 33 and consists of a connecting catheter outer lumen 41 , sensor wires 42 , connecting catheter lumen 43 and hinge wire 44 .

It specifically includes connecting the inner cavity of the catheter 43, which is a long hollow hose with any material, coaxially connected with the shaft core;

The hinge wire 44, preferably a metal wire twisted along its own axis, is arranged in the inner cavity 43 of the connecting conduit, and is connected to the impeller device with the motor to transmit electric energy;

The outer cavity 41 of the connecting catheter is a long flexible tube of any material, which is arranged coaxially with the inner cavity 43 of the connecting catheter;

The sensor wire 42 is used to connect with the sensor 32, and the setting position is not limited. In a preferred embodiment of the present application, the sensor wire 42 is placed in the tube wall of the outer lumen 41 of the connecting catheter along the axial direction of the outer lumen 41 of the connecting catheter.

In order to achieve the effect of allowing the monitoring catheter to enter the left ventricle of the heart smoothly, a connecting tube is also provided at the junction of the inflow channel and the outflow channel. And the connecting tube is designed to be curved, that is, as the transvalvular elbow 20 . The curvature is not limited, and is used to match the curvature of the left ventricle and the femoral artery.

In order to display the specific position of the monitoring catheter in the aortic arch of the heart, a developing ring 21 needs to be provided on the second connecting tube.

The monitoring catheter provided by the present invention can use different sensors so as to be applied to different monitoring environments.

One of the implementation scenarios:

As shown in Figures 1 and 2, when the sensor adopts a pressure sensor, a monitoring catheter related to the present invention includes: an inflow channel 10, a transvalvular elbow 20, a developing ring 21, an impeller device 33, a pressure sensor, and an outflow channel 30 And connecting conduit 40. The inflow channel 10 is arranged at the distal end of the monitoring catheter and is connected with the transvalvular elbow 20; the developing ring 21 is arranged at the rear end of the transvalvular elbow 20 for X-ray penetration display on the transvalvular elbow The specific position of the developing ring in the aortic arch, and record the pressure monitoring data output by the monitor 50 at this time. The transvalvular elbow 20 is connected with the outflow channel 30, and at the same time, it is connected with the inflow channel 10 to form the front section 60 of the catheter, that is, the inflow channel 10, the transvalvular elbow 20 and the outflow channel 30 connected in sequence from the distal end to the proximal end constitute the catheter Front section 60. The catheter front section 60 needs to pass through the guide wire from the inflow channel 10 to the outflow channel 30 . Firstly, the guide wire enters the left ventricle through the femoral artery, and then the front section 60 of the catheter is passed through the guide wire and sent into the left ventricle for blood pumping. The impeller device 33 is set in the outflow channel 30; the inner wall of the outflow channel 30 is provided with more than three pressure sensors equidistantly distributed for real-time monitoring of pump blood pressure, that is, the blood pressure when blood flows out of the outflow channel 30, and the average value of the data is taken Reduce test errors. The outflow channel 30 is connected with a connecting conduit 40 ; the connecting conduit includes an outer cavity 41 of the connecting conduit and an inner cavity 43 of the connecting conduit. Catheter lumen 41 is attached for positioning sensor wire 42 . The sensor wire 42 is connected to the monitoring data receiving port 70 at the proximal end of the connecting catheter 40, and is connected to an external monitor 50 through the data receiving port to display the real-time blood pressure value during blood pumping. The inner cavity 43 of the connecting conduit is used for setting the hinged wire 44 connected to the impeller device. The hinge wire is also connected to the motor arranged at the proximal end of the connecting catheter 40, and the motor drives the hinge wire to rotate the impeller device 33 to assist the pumping of blood from the left ventricle into the aorta, and record the output data of the pressure monitor after the blood pump is stabilized. The lumen 43 of the connecting catheter is used for injecting normal saline and heparin. The normal saline is used to discharge air bubbles in the connecting catheter and reduce the temperature of the impeller device before operation, and the heparin is used to prevent intraoperative complications caused by local thrombus. After the blood is pumped, compare the actual pressure data monitored by the monitor 50 with the monitoring data threshold of the impeller device before pumping blood. When the pressure monitoring data fluctuates significantly, the range beyond the monitoring data threshold is the safe value of the impeller device during operation. , it is necessary to judge the running state of the impeller device in the duct. If the impeller device rotates abnormally, the catheter should be withdrawn in time for replacement to ensure the normal operation of the auxiliary blood pump. Because the structure of the impeller device used in the monitoring catheter will be different, the corresponding pump blood flow rate is different, and the pressure generated is also different. Therefore, there is no unified monitoring range at present. It only needs to be monitored when there is a large fluctuation. Check the operation of the impeller unit.

In this application, the pressure sensor and the impeller device are integrated. When in use, the pressure sensor can more sensitively feel the side pressure of the blood acting on the outflow channel when the blood is flowing, and can obtain more accurate blood pressure monitoring data, so as to quickly respond to cardiac assistance. Whether the blood pump catheter is working properly.

Application scenario two:

When the sensor adopts a temperature sensor, it is possible to measure the temperature of the blood when the blood is pumped. The placement method of the monitoring catheter is the same as that of the application scenario 1, and redundant description will not be repeated here. After the blood is pumped, the monitor 50 displays the real-time temperature value during the blood pumping operation. The temperature monitoring data threshold means the normal range of human heart temperature is 36.9° to 37.9°. Record the temperature data before pumping blood and compare it with the actual monitored temperature data after pumping blood to judge whether the blood temperature in the heart is normal. If the real-time temperature continues to be higher than 37.9° after 10 minutes of stable operation of the catheter, blood pumping should be stopped in time.

In this application, the temperature sensor and the impeller device are integrated. When in use, the temperature sensor can sense the temperature of the human heart more sensitively, and can obtain more accurate temperature monitoring data, so as to quickly reflect whether the heart-assisted blood pump catheter is working normally.

The third application scenario:

When a rotational speed sensor is used as the sensor, the rotational speed of the impeller device during blood pumping can be measured. The placement method of the monitoring catheter is the same as that of the application scenario 1, and redundant description will not be repeated here. The monitor 50 displays the real-time rotational speed of the impeller when the blade is pumping blood. Record the real-time speed of the impeller device, compare it with the monitoring data threshold, that is, the actual speed of the motor, and judge the operation status of the impeller device in the duct. If the speed of the impeller device is abnormal, it is detected that the actual monitored speed data does not match the actual speed of the motor, and the catheter should be withdrawn in time for replacement to ensure the normal operation of the auxiliary blood pump.

In this application, the rotational speed sensor and the impeller device are integrated. When in use, the rotational speed sensor can obtain more accurate rotational speed data of the impeller device, so as to quickly reflect whether the heart-assisted blood pumping catheter is working normally.

The fourth application scenario:

When the sensor adopts a flow sensor, it can measure the blood flow when pumping blood. The way of placing the catheter is the same as that of the application scenario 1, and redundant description will not be repeated here. The monitor 50 displays the real-time flow of blood pumped by the impeller device during the blood pumping work. The monitoring device obtains actual monitoring data, records the real-time flow of blood during blood pumping, and compares it with the threshold value of the monitoring data before pumping to judge whether the impeller device in the catheter is pumping blood normally. If the pump blood flow is abnormal, it is judged that the monitoring catheter is not in normal working condition, and the catheter should be withdrawn in time for replacement to ensure the normal operation of the auxiliary blood pump. Specifically, assuming that the human heart pump blood flow X L/min is recorded before the impeller device rotates, if the maximum pump blood flow of the impeller device itself is 2.0-2.5L/min (excluding the human heart pump blood flow), the pump blood flow It is recorded as 2.Y L/min, and the blood flow threshold of the normal pump at this time is X+2.Y L/min. When the actual monitoring data after pumping blood fluctuates greatly, that is, when the monitored flow rate suddenly drops from the initial flow rate X+2.Y L/min to about X L/min, it can be regarded as that the impeller device stops rotating at this time, and it should be timely Replace catheter.

In this application, the flow sensor and the impeller device are integrated. When in use, the flow sensor can more sensitively receive the blood flow of the blood flowing out of the outflow channel, so that more accurate flow monitoring data can be obtained, so as to quickly respond to the heart-assisted blood pumping catheter Is it working properly.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are within the scope of the pending rights of the present invention. within the scope of protection.

Claims (10)

1. A monitoring catheter for assisting cardiac pumping, the monitoring catheter comprising:

the inflow channel is a tubular body with a through hole on the pipe wall;

the outflow channel is connected with the proximal end of the inflow channel and is a tubular body with a through hole on the pipe wall;

an impeller device disposed within the outflow channel;

the sensor is arranged on the impeller device;

fluid enters from the inflow channel and flows out of the outflow channel through the impeller device; when the fluid flows out, the impeller device can release the rotary pressure generated by the fluid, so that the sensor can sense the detected information and output the data information.

2. The cardiac pump assisted monitoring catheter of claim 1, wherein the impeller means comprises: the base is a cylinder;

the shaft core is coaxially arranged with the base;

the blade is arranged on the outer surface of the shaft core; the area of the circumcircle of the blade is smaller than the cross-sectional area of the base;

the outer wall of the impeller is an annular body; coaxially connected to the base;

and a notch for installing a sensor is arranged on the outer wall of the impeller.

3. The cardiac pumping-assist monitoring catheter as recited in claim 2 in which the blade comprises a spiral sector formed by axial rotation on an outer surface of the hub.

4. The cardiac assist pump monitoring catheter of claim 1, further comprising: and the connecting pipe is used for connecting the inflow channel and the outflow channel, and a developing ring is arranged on the connecting pipe.

5. The cardiac pump assisted monitoring catheter of claim 4, wherein the connecting tube is an elbow.

6. The monitoring catheter for assisting cardiac pumping according to claim 1, further comprising, in the monitoring catheter: a connecting conduit, which is a tubular object, is connected to the proximal end of the impeller device.

7. The cardiac pump assisted monitoring catheter of claim 6, wherein the connecting catheter comprises:

the connecting catheter inner cavity is coaxially connected with the impeller device;

the reaming wire is arranged in the inner cavity of the connecting catheter;

the connecting catheter outer cavity is coaxially arranged with the connecting catheter inner cavity;

and the sensor wire is arranged in the pipe wall of the outer cavity of the connecting catheter and used for being connected with the sensor.

8. A monitoring catheter for assisting cardiac pumping according to claim 3, wherein the sensor comprises: pressure sensor, temperature sensor, rotational speed sensor and flow sensor.

9. A monitoring system for assisting cardiac pumping, the monitoring system comprising: a monitoring catheter for assisting cardiac pumping according to any one of claims 1-8;

a data receiving port connected with the proximal end of the connecting catheter for receiving signals;

and the monitoring device is electrically connected with the monitoring catheter for assisting the heart to pump blood and is used for monitoring information of signals.

10. A method of monitoring assisted heart pumping, for use in a system for monitoring assisted heart pumping as in claim 9, the method comprising: placing the monitoring catheter for assisting the heart to pump blood into the left ventricle through the femoral artery by a guide wire; before the impeller device is started, the monitoring device obtains a monitoring data threshold value; when the impeller device is started, the monitoring device obtains actual monitoring data; comparing the actual monitoring data with a monitoring data threshold value, and judging that the monitoring catheter is in an abnormal working state when the actual monitoring data is not in the range of the monitoring data threshold value; and when the actual monitoring data fluctuates within the range of the monitoring data threshold value, judging that the monitoring catheter is in a normal working state.

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