CN117137680A

CN117137680A - Valve durability testing device

Info

Publication number: CN117137680A
Application number: CN202210574051.XA
Authority: CN
Inventors: 庄晓峰; 苏陆予; 金益鑫; 刘世红; 陈国明
Original assignee: Shanghai Microport Cardioflow Medtech Co Ltd
Current assignee: Shanghai Microport Cardioflow Medtech Co Ltd
Priority date: 2022-05-24
Filing date: 2022-05-24
Publication date: 2023-12-01

Abstract

The invention provides a valve durability testing device, comprising: a housing having a test chamber for containing a liquid medium; a fixing part arranged in the test cavity and used for installing a valve; the high-speed camera is arranged outside the shell and used for collecting image information of the valve. The test device facilitates the observer to identify valve abnormalities and analyze the abnormal condition.

Description

Valve durability testing device

Technical Field

The invention relates to the technical field of testing devices of medical instruments, in particular to a testing device for valve durability.

Background

With the development of society and aging of population, the incidence of valvular heart disease has increased significantly. At present, traditional surgery is still the first treatment for patients with severe valvular lesions, but for patients with advanced age, combined multi-organ disease, history of open chest surgery and poor cardiac function, traditional surgery is at great risk, has high mortality, and some patients even have no surgical opportunity. In recent years, transcatheter heart valve surgery has received extensive attention from expert students because of the advantages of no need for chest opening, small trauma, quick patient recovery, etc.

Transcatheter heart valves require durability testing prior to clinical use. Taking the transcatheter aortic valve as an example, the durability test requires that the transcatheter aortic valve not fail upon up to two hundred million cycles under conditions of pressure. Common failures are perforations, tears, leaflet delamination, valve wear, insufficiency, ruptures, excessive deformation, single component failure, and other mechanical damage and wear, among others. In order to understand the durable failure of a transcatheter aortic valve and to analyze the cause of the failure, it is necessary to observe the valve's movement multiple times during the test, but the valve is usually moved cyclically at a higher frequency during the durable test, which is difficult to observe carefully with the naked eye alone.

Disclosure of Invention

The invention aims to provide a valve durability testing device which is used for assisting a viewer in observing valve movements.

To achieve the above object, the present invention provides a valve durability test device comprising:

a housing having a test chamber for containing a liquid medium;

a fixing part arranged in the test cavity and used for installing a valve;

a high speed camera disposed outside the housing and configured to capture image information of the valve.

Optionally, the testing device further comprises a monitoring part, wherein the monitoring part comprises a control unit, and the control unit is in communication connection with the high-speed camera and is used for controlling the high-speed camera to acquire the image information of the valve.

Optionally, the monitoring part comprises a pressure monitoring unit; the pressure monitoring unit is arranged on the shell and is used for monitoring the pressure difference between the inflow end and the outflow end of the valve;

the control unit is also in communication connection with the pressure monitoring unit, and is used for receiving the pressure difference, judging whether the pressure difference can reach a preset range or not, and controlling the high-speed camera to acquire the image information when the pressure difference cannot reach the preset range; and/or the number of the groups of groups,

the control unit is configured to control the high-speed camera to intermittently acquire the image information when the pressure difference can reach within the predetermined range.

Optionally, the monitoring part further comprises a storage unit, wherein the storage unit is in communication connection with the control unit and the high-speed camera, and is used for storing the image information acquired by the high-speed camera when the pressure difference cannot reach the preset range.

Optionally, the test device further comprises a light source, the light source being disposed in the test cavity.

Optionally, the fixing part is provided with an overflow hole, and the overflow hole is used for communicating with the inner cavity of the valve; a first observation window is arranged on the shell, and the high-speed camera acquires image information of the valve through the first observation window;

the light source is located at one side of the fixing part far away from the first observation window, and on a plane perpendicular to the axis of the overflow hole, the projection of the light source is located in the projection of the overflow hole.

Optionally, the axis of the first observation window and the axis of the overflow hole are parallel or coincide with each other.

Optionally, the testing device further comprises an isolation cover, wherein the isolation cover is arranged on the light source and isolates the light source from the liquid medium.

Optionally, the shell comprises a shell body and a convex lens, a first window is formed in the shell body, the convex lens covers the first window to form a first observation window, and the high-speed camera acquires image information of the valve through the first observation window.

Optionally, the pressure differential includes a forward pressure differential and a reverse pressure differential; the testing device also comprises a driving mechanism, wherein the driving mechanism comprises a solution pump and a power source which are connected; the solution pump is arranged in the test cavity; the power source is used for driving the solution pump to move in a direction approaching or separating from the valve; when the power source drives the solution pump to move in a first direction, the liquid medium generates the positive pressure difference between the inflow end and the outflow end of the valve; when the power source drives the solution pump to move along a second direction, the forward pressure difference is relieved and the reverse pressure difference is generated; the second direction is opposite to the first direction; the forward pressure differential has a first predetermined range and the reverse pressure differential has a second predetermined range;

failure of the pressure differential to reach the predetermined range means that the forward pressure differential fails to reach the first predetermined range and/or the reverse pressure differential fails to reach the second predetermined range.

Optionally, the testing device further comprises a pressure regulating mechanism disposed on the housing and at least partially within the testing chamber for regulating a pressure differential between the inflow and outflow ends of the valve.

Optionally, the fixing part is provided with an overflow hole, and the overflow hole is used for communicating with the inner cavity of the valve; the pressure regulating mechanism comprises an adjusting part and a blocking part which are connected, the blocking part is arranged in the test cavity, and on a plane perpendicular to the axis of the overflow hole, the blocking part is arranged at the periphery of the overflow hole; the blocking part is provided with a liquid flow passage which extends along the axial direction of the overflow hole and is used for allowing part of liquid medium to circulate, the liquid flow passage is internally provided with a valve, and the adjusting part is used for controlling the opening of the valve.

Compared with the prior art, the valve durability testing device has the following advantages:

the valve durability testing device comprises a shell, a fixing part and a high-speed camera, wherein the shell is provided with a testing cavity, the testing cavity is used for containing liquid medium, the fixing part is arranged in the testing cavity and used for installing a valve, and the high-speed camera is arranged outside the shell and used for collecting image information of the valve. The high-speed camera is used for collecting the image information of the valve, so that an operator can carefully observe the valve state by slowly releasing the image information, and whether the valve fails or not is judged.

Further, the testing device also comprises a monitoring part, wherein the monitoring part comprises a control unit, and the control unit is in communication connection with the high-speed camera and is used for controlling the high-speed camera to acquire the image information of the valve. The control unit is utilized to control the high-speed camera to acquire the image information of the valve when needed, so that resource waste caused by long-time unmanned operation is avoided.

Still further, the monitoring portion further includes a pressure monitoring unit, the pressure sensor is disposed on the housing and is configured to monitor a pressure difference between an inflow end and a flow end of the valve, the control unit is in communication connection with the pressure monitoring unit, and the control unit is configured to receive the pressure difference and determine whether the pressure difference can reach a predetermined range, and control the high-speed camera to acquire image information of the valve when the pressure difference cannot reach the predetermined range. In the testing device, the high-speed camera can be started to collect the image information of the valve when the pressure difference between the inflow end and the outflow end of the valve cannot reach the preset range, so that an observer can find out abnormality of the valve in time and analyze the abnormality, the observer is not required to observe the image information of the valve frame by frame, resource waste is avoided, and labor intensity of the observer is also reduced.

Drawings

The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:

FIG. 1 is a schematic diagram of a valve durability testing device according to one embodiment of the present invention;

FIG. 2 is a schematic diagram of the connection relationship among a high-speed camera, a pressure monitoring unit, a control unit, and a storage unit of a valve durability testing device according to an embodiment of the present invention;

FIG. 3 is a schematic illustration of the relationship between the projection of the flow orifice of a valve durability testing device provided in accordance with an embodiment of the present invention and a light source on a plane perpendicular to the axis of the flow orifice;

fig. 4 is a schematic structural view of a valve durability testing device according to another embodiment of the present invention.

Reference numerals are described as follows:

10-test device, 100-housing, 110-housing body, 111-first window, 120-convex lens, 101-test chamber, 102-first observation window, 103-second observation window, 200-fixed part, 201-overflow hole, 300-high speed camera, 301-manual switch, 400-monitor part, 410-pressure monitor unit, 420-control unit, 430-storage unit, 501-liquid medium, 502-gaseous medium, 600-light source, 610-isolation cover, 700-driving mechanism, 710-solution pump, 720-power source, 730-transmission part, 731-connecting block, 732-rod, 733-joint frame, 740-first buffer, 750-second buffer, 810-adjusting part, 910-heating rod, 20-valve.

Detailed Description

Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that, the illustrations provided in the present embodiment merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.

In addition, each embodiment of the following description has one or more features, respectively, which does not mean that the inventor must implement all features of any embodiment at the same time, or that only some or all of the features of different embodiments can be implemented separately. In other words, those skilled in the art can implement some or all of the features of any one embodiment or some or all of the combinations of the features of multiple embodiments selectively according to the disclosure of the present invention as possible and depending on design specifications or actual requirements, thereby increasing the flexibility of the implementation of the present invention.

As used in this specification, the singular forms "a", "an" and "the" include plural referents, unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly, as for example, they may be fixed, they may be removable, or they may be integrally connected. Either mechanically or electrically. Can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

The invention will be further described in detail with reference to the accompanying drawings, in order to make the objects, advantages and features of the invention more apparent. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. The same or similar reference numbers in the drawings refer to the same or similar parts. Embodiments of the present invention provide a valve durability testing device 10 as shown in fig. 1 and 2. The test device 10 includes a housing 100, a fixing portion 200, and a high-speed camera 300. Wherein the housing 100 has a test chamber 101, the test chamber 101 is configured to hold a liquid medium 501. The fixing portion 200 is disposed in the test chamber 101 and is used for mounting the valve 20. The high-speed camera 300 is disposed outside the housing 100 and is used to collect image information of the valve 20.

It should be appreciated by those skilled in the art that the high-speed camera 300 described in the present embodiment is a device capable of capturing a moving image at an exposure of less than 1/1000 seconds or a frame rate exceeding 250 frames/second, and the frame rate can be up to 500 frames/second or more at the time of actual test. And, the valve 20 includes opposite inflow and outflow ends, the inflow end being the end of the valve 20 into which blood flows after implantation of the valve 20 into the heart, and the outflow end of the valve 20 being the end from which blood flows out of the valve 20. In a durability test, the fluid medium 501 is used to simulate blood, which may be water, saline, etc., and by flowing the fluid medium 501 relative to the valve 20, the valve 20 may be cyclically switched between an open state and a closed state, specifically when the fluid medium 501 enters the valve 20 from the inflow end of the valve 20 and creates a forward pressure differential between the inflow end and the outflow end of the valve 20, the valve 20 is caused to open, and when the fluid medium 501 flows out of the lumen of the valve 20 and the forward pressure differential is relieved and a reverse pressure differential is created, the valve 20 is caused to close.

After the high-speed camera 300 is used to collect the image information of the valve 20 and transmit the image information to an external device such as a computer, the observer can observe the valve state during the test through slow motion playback, so as to analyze whether the valve is abnormal or not and analyze the abnormal condition. It will be appreciated that the housing 100 may be provided with a first viewing window 102, and the high-speed camera 300 may acquire image information of the valve 20 through the first viewing window 102.

Further, the testing device 10 further comprises a monitoring part 400, the monitoring part 400 comprises a control unit 420, and the control unit 420 is in communication connection with the high-speed camera 300 and is used for controlling the high-speed camera 300 to collect image information of the valve. The control unit 420 is used for controlling the high-speed camera 300 to acquire the image information of the valve 20 when needed, so that the resource waste caused by long-time unmanned operation is avoided.

Since the high-speed camera 300 generates a huge amount of data when acquiring image information, the amount of image information that an observer needs to observe is huge. The high-speed camera 300 may thus be controlled to be intermittently activated, for example, every one hour interval, by the control unit 420 to collect image information of the valve to reduce waste of resources and labor intensity for the observer. There are problems in doing so, for example, the observer needs to observe the image information of the valve frame by frame to distinguish whether the valve is abnormal at a certain moment, so as to analyze the abnormal situation. And when the valve fails in a time period when the high-speed camera does not work, the high-speed camera cannot timely acquire image information when valve abnormality occurs, so that analysis of the valve abnormality is not facilitated.

In view of this, the monitoring part 400 further includes a pressure monitoring unit 410, and the pressure monitoring unit 410 is disposed on the housing 100 and is used for monitoring the pressure difference between the inflow end and the outflow end of the valve 20. The control unit 420 is further in communication connection with the pressure monitoring unit 410 and the high-speed camera 300, and the control unit 420 is configured to receive the pressure difference and determine whether the pressure difference can reach a predetermined range, and control the high-speed camera 300 to acquire image information of the valve 20 when the pressure difference cannot reach the predetermined range.

The pressure difference comprises a forward pressure difference and a reverse pressure difference as described above, the forward pressure difference having a first predetermined range and the reverse pressure difference having a second predetermined range, i.e. the predetermined range comprises the first predetermined range and the second predetermined range. The valve opens when the forward pressure differential reaches the first predetermined range and closes when the reverse pressure differential reaches the second predetermined range. In other words, the pressure difference failing to reach the predetermined range means that the positive pressure difference failing to reach the first predetermined range and/or the reverse pressure difference failing to reach the second predetermined range.

An abnormality of the valve 20 may be substantially determined when an abnormality occurs in the forward pressure difference, i.e., the forward pressure difference cannot reach the first predetermined range, e.g., is less than the first predetermined range, and/or when an abnormality occurs in the reverse pressure difference, i.e., the reverse pressure difference cannot reach the second predetermined range, e.g., is greater than the second predetermined range. Therefore, even if the abnormality of the valve 20 occurs in the predetermined working gap of the high-speed camera 300, which results in the abnormality of the pressure difference (i.e., at least one of the forward pressure difference and the reverse pressure difference), the monitoring part 400 provided by the embodiment of the present invention can control the high-speed camera 300 to immediately respond to and activate the abnormal pressure difference, and timely acquire the image information when the abnormality of the valve 20 occurs, thereby enabling an observer to rapidly recognize whether the abnormality of the valve 20 occurs and analyze the abnormal situation. It will be appreciated that the first and second predetermined ranges may remain unchanged throughout the test or may be modified as desired, and that the first predetermined range is, for example, greater than n, where n is positive and the second predetermined range is, for example, less than m, where m is negative.

In the embodiment of the present invention, when the pressure difference between the inflow end and the outflow end of the valve 20 is not abnormal, the manual switch 301 of the high-speed camera 300 may be manually controlled by an observer to make the high-speed camera 300 intermittently operate, or the control unit 420 may automatically control the high-speed camera 300 to intermittently operate. Here, the high-speed camera 300 is intermittently operated, that is, the high-speed camera 300 is started at predetermined time intervals to collect image information, it may be understood that the time interval between any two starts of the high-speed camera 300 may be equal or unequal, for example, the high-speed camera 300 may be started every one hour, or the time interval between the first start and the second start of the high-speed camera 300 may be one hour, and the time interval between the second start and the third start may be more than or less than one hour, which is specifically set according to needs.

Further, the monitoring unit 400 further includes a storage unit 430, and the storage unit 430 is communicatively connected to the control unit 420 and the high-speed camera 300. When the control unit 420 determines that the pressure difference cannot reach the predetermined range (i.e., the forward pressure difference cannot reach the first predetermined range and/or the reverse pressure difference cannot reach the second predetermined range), the storage unit 430 stores the image information of the valve 20 acquired by the high-speed camera 300. In so doing, the amount of data stored by the storage unit 430 can be reduced, and the workload of the observer can be further reduced when performing observation analysis of abnormalities of the valve 20.

In this embodiment, the housing 100 includes a housing body 110 and a convex lens 120, a first window 111 is formed on the housing body 110, and the convex lens 120 covers the first window 111 to form the first observation window 102. The convex lens 120 covers the first window 111, so that the first observation window 102 has an amplifying function, and the high-speed camera 300 can collect the amplified image information of the valve 20, which is more beneficial for an observer to observe the motion state of the valve 20, distinguish abnormality and analyze the abnormal condition.

Preferably, the area of the first observation window 102 is larger than the cross-sectional area of the valve 20, and the shape of the first observation window 102 is not particularly limited, and may be a regular shape such as a circle, an ellipse, a D-shape, or the like, or may be other irregular shape, and may be specifically configured according to the shape of the cross-section of the valve 20. The cross section of the valve 20 refers to a cross section of the valve 20 perpendicular to its axis.

In addition, the fixing portion 200 is provided with an overflow hole 201 (as shown in fig. 3), when the valve 20 is mounted on the fixing portion 200, the axis of the valve 20 is parallel to or coincident with the axis of the overflow hole 201, and both are parallel to the flow direction of the liquid medium, and the overflow hole 201 is also communicated with the inner cavity of the valve 20, so that the liquid medium 501 can flow in the overflow hole 201 and the inner cavity of the valve 20. The shape of the overflow hole 201 is not particularly limited in the embodiment of the present invention, and may be circular, elliptical, D-shaped, or any other suitable shape. In addition, the direction of the first observation window 102 is not limited in the embodiment of the present invention, and the axis of the first observation window 102 may be selected to be parallel to, overlap with, or form a certain angle with the axis of the overflow hole 201. Preferably, the axis of the first viewing window 102 is parallel to or overlaps the axis of the flow aperture 201. Further, in some embodiments, the axis of the first viewing window 102 overlaps the axis of the flow-through aperture 201, and when the valve 20 is mounted on the fixed portion 200, the axis of the valve 20 also overlaps the axis of the flow-through aperture 201, which has the advantage of facilitating the viewing of the valve 20 along the axial direction of the valve 20 by a viewer through the first viewing window 102. It will be appreciated that in actual operation, if an observer wishes to view the valve 20 from its outflow end, the outflow end of the valve 20 may be brought closer to the first viewing window 102 when the valve 20 is installed, and if an observer wishes to view the valve 20 from its inflow end, the inflow end of the valve 20 may be brought closer to the first viewing window 102.

Further, the testing device 10 further comprises a light source 600, the light source 600 being arranged in the testing chamber 101. By disposing the light source 600 in the test cavity 101, on the one hand, blocking of the observation path caused by the conventional external handheld light source is avoided, and on the other hand, compared with disposing the light source outside the housing 100, reflection or reflection will not occur at the first observation window 102, which is more convenient for observation.

Still further, with continued reference to fig. 1 in combination with fig. 3, the light source 600 is disposed below the fixing portion 200, and preferably on a plane perpendicular to the axis of the flow-through hole 201, and the projection of the light source 600 is within the projection of the flow-through hole 201. Thus, when the valve 20 is mounted on the fixing portion 200, the projection of the light source 600 is also within the projection of the valve 20 on a plane perpendicular to the axis of the overflow hole 201. This has the advantage that the light source 600 can uniformly irradiate the valve 20 in the circumferential direction of the valve 20, thereby reducing dead angles for polishing, reducing shadows around the valve 20, and effectively improving the recording and observation quality of the movement of the valve 20. The light source 600 may be an LED light source, which is small in size and more suitable for being disposed in the test cavity 101, and has the advantages of low power consumption, high luminous efficiency and long service life.

Preferably, the testing device 10 further includes an isolation cover 610, where the isolation cover 610 is covered on the light source 600 and isolates the light source 600 from the liquid medium 501, so as to avoid the liquid medium 501 from adversely affecting the light source 600.

As previously described, the valve 20 needs to be switched between the open and closed states during testing by the driving mechanism 700 driving the flow of the liquid medium 501. In detail, referring back to fig. 1, in an exemplary embodiment, the fixing portion 200 is fixedly disposed on the housing 100, and the driving mechanism 700 includes a solution pump 710 and a power source 720. The solution pump 710 is disposed in the test chamber 101 and is configured to be immersed in the liquid medium 501, a portion of the power source 720 may be disposed outside the housing 100, and another portion may extend into the test chamber 102 and be connected to the solution pump 710 for driving the solution pump 710 in a direction toward or away from the valve 20, so that the liquid medium 501 generates the pressure difference (i.e., the aforementioned forward pressure difference or reverse pressure difference) between the inflow end and the outflow end of the valve 20, and opens or closes the valve 20 under the pressure difference. It will be appreciated that the durability test of the valve 20 is an accelerated test, and that the valve 20 should be opened and closed more than 300 times/min, and thus the frequency of movement of the solution pump 710 should also be more than 300 times/min.

More specifically, with continued reference to fig. 1, the drive mechanism 700 may be disposed on a side of the valve 20 remote from the first viewing window 102, avoiding the drive mechanism 700 blocking viewing passageways. When the outflow end of the valve 20 is closer to the first viewing window 102, the driving mechanism 700 is disposed closer to the inflow end of the valve 20. Thus, when the power source 720 drives the solution pump 710 to move in the first direction, the solution pump 710 drives the liquid medium 501 from the inflow end of the valve 20 into the valve 20 through the overflow hole 201, so that the pressure of the inflow end of the valve 20 is greater than the pressure of the outflow end, and thus the positive pressure difference is generated between the inflow end and the outflow end of the valve 20, and the valve 20 is opened, and the liquid medium 501 flows out from the outflow end of the valve 20. Conversely, when the power source 720 drives the solution pump 710 in a second direction opposite the first direction, the forward pressure differential is relieved and the reverse pressure differential is created between the inflow and outflow ends to close the valve 20. In this embodiment, the first direction is the direction in which the inflow end of the valve 20 faces the outflow end, and the second direction is the direction in which the outflow end of the valve 20 faces the inflow end, that is, the solution pump 710 is close to the valve 20 when the solution pump 710 moves in the first direction, and the solution pump 710 is far away from the valve 20 when the solution pump 710 moves in the second direction.

Alternatively, to avoid interference between the driving mechanism 700 and the valve 20, the longitudinal section of the testing chamber 101 may be substantially U-shaped, wherein the first viewing window 102 is disposed at one end of the U-shaped structure, and the other portion of the power source 720 of the driving mechanism 700 may extend into the testing chamber 101 from the other end of the U-shaped structure. In addition, the test chamber 101 is further configured to contain a gaseous medium 502, for example, compressed air, where the gaseous medium 502 is located on a side of the liquid medium 501 away from the first viewing window 102, so as to simulate the pressure compliance of heart tissue in a human body, and ensure that the valve 20 can be opened.

It will be appreciated by those skilled in the art that by adjusting the driving force provided by the power source 720, the rate of movement of the solution pump 710, and thus the rate of entry of the liquid medium 501 into the valve 20, can be adjusted, which in turn can adjust the pressure differential between the inflow and outflow ends of the valve 20. When the pressure differential between the inflow and outflow ends of the valve 20 is adjusted in this manner, each adjustment will cause a large variation in the pressure differential, and thus this manner of adjustment may be referred to as coarse adjustment. In the embodiment of the present invention, the observer may manually adjust the adjusting knob of the power source 720 to adjust the working parameter of the power source 720, thereby adjusting the driving force, or may connect the power source 720 with the control unit 420 in a communication manner, and set the working parameter of the power source 720 on the control unit 420 to adjust the driving force.

Furthermore, in some cases, it is desirable for the observer to be able to adjust the pressure difference to a small extent (i.e. fine-tune the pressure difference), for which purpose the test device 10 further comprises a pressure regulating mechanism, which is arranged on the housing 100 and is located at least partially within the test chamber 101, for fine-tuning the pressure difference between the inflow end and the outflow end of the valve 20.

Specifically, the pressure regulating mechanism includes an adjusting portion 810 and a blocking portion (not shown in the drawing) that are connected, the blocking portion being provided in the test chamber 101 and on a plane perpendicular to the axis of the flow-through hole 201, the blocking portion being provided at the outer periphery of the flow-through hole 201. The blocking portion is provided with a liquid flow channel, and the liquid flow channel extends along the axial direction of the overflow hole 201 and is used for circulating part of the liquid medium 501. A valve is further disposed in the liquid flow channel, and the adjusting part 810 is connected with the valve and is used for controlling the opening of the valve. When the opening degree of the valve is increased, the portion of the liquid medium 501 flowing into the liquid flow passage is increased, which results in a corresponding decrease in the portion of the liquid medium 501 flowing from the overflow hole 201 into the valve 20, so that the pressure difference between the inflow end and the outflow end of the valve 20 is decreased. When the opening degree of the valve is reduced, the portion of the liquid medium 501 flowing into the liquid flow is reduced, so that the portion of the liquid medium 501 flowing into the valve 20 from the overflow hole 201 is correspondingly increased, so that the pressure difference between the inflow end and the outflow end of the valve 20 is increased.

In an alternative embodiment, referring to fig. 4, the fixing portion 200 is movably disposed in the inner cavity. The driving mechanism 700 is at least partially disposed in the test chamber 101 and connected to the fixing portion 200, so as to drive the fixing portion 200 to reciprocate, and further drive the valve 20 to synchronously move, so as to cause the valve 20 to open and close.

With continued reference to fig. 4, when the driving mechanism 700 drives the fixing portion 200 to move the valve 20 along the direction in which the outflow end of the valve 20 points to the inflow end, the pressure of the liquid medium 501 at the inflow end of the valve 20 is greater than the pressure at the outflow end of the valve 20, that is, the liquid medium 501 forms the positive pressure difference between the inflow end and the outflow end of the valve 20 so as to open the valve 20. Conversely, when the driving mechanism 700 drives the fixing portion 200 to move the valve 20 in a direction from the inflow end to the outflow end of the valve 20, the forward pressure difference is relieved and the reverse pressure difference is generated to close the valve 20.

Further, the drive mechanism 700 may include a power source 720 and a transmission 730. The power source 720 is disposed outside the housing 100 and is connected to the housing 100. A part of the transmission part 730 is disposed outside the housing 100 and is connected to the power source 720, and another part of the transmission part 730 passes through the housing 100 and extends into the test cavity 101 and is connected to the fixing part 200, so as to drive the fixing part 200 to move along the axial direction of the first observation window 102 under the action of the power source 720 and drive the valve 20 to move synchronously, so as to realize opening or closing of the valve 20.

Further, the driving mechanism 700 further includes a first buffer member 740 and a second buffer member 750. The first damping member 740 is, for example, a spring, and is disposed between the power source 720 and the housing 100 to damp vibration of the power source 720 caused during operation. The transmission part 730 includes a connection block 731, a rod 732, and a coupling frame 733, wherein the connection block 731 is disposed outside the housing 100 and connected to the power source 720, one end of the rod 732 is connected to the connection block 731, the other end extends into the test chamber 101, the coupling frame 733 is disposed in the test chamber 101, and the coupling frame 733 is connected to the rod 732 and also connected to the fixing part 200. The second buffer member 750 is, for example, a bellows, disposed outside the housing 100, and is sleeved on the rod 732, and has one end thereof in sealing connection with the connection block 731 and the other end thereof in sealing connection with the outer wall of the housing 100, so as to prevent the liquid medium 501 from leaking, and to reduce vibration caused by movement of the transmission part 730 by expansion and contraction of the bellows. In this embodiment, the light source 600 may be disposed on a side of the coupling frame 733 facing the fixing portion 200.

In addition, the test device 10 further includes a temperature maintaining mechanism for maintaining the liquid medium 501 at a predetermined temperature, for example, about 37 ℃. The temperature maintaining mechanism may include a numerical control module, a temperature sensor, and a heating rod 910, where the temperature sensor and the heating rod 910 may be disposed in the test chamber 101 and are respectively connected with the numerical control module in a communication manner, and the numerical control module is configured to control the heating rod 910 to operate according to the actual temperature of the liquid medium 501 sensed by the temperature sensor, so as to maintain the liquid medium 501 at the predetermined temperature during the test. And, in this embodiment of the present invention, a second observation window 103 parallel to the axis of the first observation window 102 may be further disposed on the housing 100, for observing the valve 20 from the side.

Although the present invention is disclosed above, it is not limited thereto. Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A valve durability testing device, comprising:

a housing having a test chamber for containing a liquid medium;

a fixing part arranged in the test cavity and used for installing a valve;

2. The valve durability testing device of claim 1 further comprising a monitoring portion including a control unit communicatively coupled to the high-speed camera and configured to control the high-speed camera to capture image information of the valve.

3. The valve durability testing device of claim 2 wherein the monitoring portion comprises a pressure monitoring unit; the pressure monitoring unit is arranged on the shell and is used for monitoring the pressure difference between the inflow end and the outflow end of the valve;

the control unit is also in communication connection with the pressure monitoring unit, and is used for receiving the pressure difference, judging whether the pressure difference can reach a preset range or not, and controlling the high-speed camera to acquire the image information when the pressure difference cannot reach the preset range;

and/or the number of the groups of groups,

4. The valve durability testing device of claim 3 wherein the monitoring portion further comprises a memory unit in communication with the control unit and the high speed camera, the memory unit for storing the image information acquired by the high speed camera when the pressure differential cannot reach the predetermined range.

5. The valve durability testing device of any one of claims 1-4 further comprising a light source disposed in the testing chamber.

6. The valve durability testing device of claim 5 wherein the fixation portion is provided with an overflow aperture for communication with the valve lumen; a first observation window is arranged on the shell, and the high-speed camera acquires image information of the valve through the first observation window;

7. The valve durability testing device of claim 6 wherein the axis of the first viewing window and the axis of the flow-through aperture are parallel or coincident with each other.

8. The valve durability testing device of claim 5 further comprising an isolation cover over the light source and isolating the light source from the liquid medium.

9. The valve durability testing device of claim 1, wherein the housing comprises a housing body and a convex lens, wherein the housing body is provided with a first window, the convex lens covers the first window to form a first observation window, and the high-speed camera acquires image information of the valve through the first observation window.

10. The valve durability testing device of claim 3 wherein the pressure differential comprises a forward pressure differential and a reverse pressure differential; the testing device also comprises a driving mechanism, wherein the driving mechanism comprises a solution pump and a power source which are connected; the solution pump is arranged in the test cavity; the power source is used for driving the solution pump to move in a direction approaching or separating from the valve; when the power source drives the solution pump to move in a first direction, the liquid medium generates the positive pressure difference between the inflow end and the outflow end of the valve; when the power source drives the solution pump to move along a second direction, the forward pressure difference is relieved and the reverse pressure difference is generated; the second direction is opposite to the first direction; the forward pressure differential has a first predetermined range; the reverse pressure differential has a second predetermined range;

11. The valve durability testing device according to any one of claims 1-4, 9, 10 further comprising a pressure regulating mechanism disposed on the housing and at least partially in the testing chamber for regulating a pressure differential between an inflow end and an outflow end of the valve.

12. The valve durability testing device of claim 11 wherein the securing portion has an overflow aperture thereon for communication with the valve lumen; the pressure regulating mechanism comprises an adjusting part and a blocking part which are connected, the blocking part is arranged in the test cavity, and on a plane perpendicular to the axis of the overflow hole, the blocking part is arranged at the periphery of the overflow hole; the blocking part is provided with a liquid flow passage which extends along the axial direction of the overflow hole and is used for allowing part of liquid medium to circulate, the liquid flow passage is internally provided with a valve, and the adjusting part is used for controlling the opening of the valve.