Catheter protection device and catheter system

Abstract

The invention provides a catheter protection device and a catheter system. The catheter system comprises a balloon catheter and the catheter protection device. The catheter protection device comprises a catheter and a pressure relief mechanism, the pressure relief mechanism is connected with the catheter, and the catheter comprises a pressure relief opening; the pressure relief mechanism comprises a blocking piece, a pressure threshold value is preset, and when the pressure in the catheter is smaller than the pressure threshold value, the blocking piece blocks the pressure relief opening; when the pressure in the guide pipe is larger than the pressure threshold value, the blocking piece can move under the action of the fluid pressure in the guide pipe, and then the fluid pressure in the guide pipe is reduced. According to the catheter protection device, the fluid pressure in the catheter can be reduced, so that the balloon catheter is prevented from being broken and leaked, and the safety in the operation process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a catheter protection device and a catheter system. Background Art

[0002] Atherosclerotic stenosis refers to the accumulation of lipids in the blood on the smooth endothelium of blood vessels due to abnormal lipid metabolism, gradually accumulating into atherosclerotic lipid plaques. Over time, these plaques increase in number and even calcify, causing narrowing of the blood vessel lumen and obstruction of blood flow.

[0003] One of the most widely used methods for treating clinically important atherosclerotic plaques is balloon catheter dilatation technology, in which a balloon dilatation catheter is introduced into the body percutaneously or through an exposed incision in the artery and placed in the artery, and is delivered along the inside of the blood vessel on a guided path until a balloon with contraction and expansion functions is placed at the location of the atherosclerotic plaque that needs treatment.

[0004] During clinical use, balloon dilatation catheters occasionally rupture and leak fluid in the body, which can easily cause clinical harm and have adverse social impacts. To avoid such phenomena, the current strategy is to reduce product defects during the catheter manufacturing process and standardize the use of doctors, but the above methods cannot completely avoid the risk of balloon catheter rupture and leakage. Summary of the invention

[0005] The object of the present invention is to provide a catheter protection device and a catheter system, wherein the catheter protection device can reduce the fluid pressure in the catheter, thereby avoiding the rupture and leakage of the balloon catheter and improving the safety during the operation.

[0006] To achieve the above-mentioned purpose, the present invention provides a catheter protection device, including a catheter and a pressure relief mechanism, wherein the pressure relief mechanism is connected to the catheter, and the catheter includes a pressure relief port; the pressure relief mechanism includes a blocking member, and a pressure threshold is preset. When the pressure in the catheter is less than the pressure threshold, the blocking member blocks the pressure relief port; when the pressure in the catheter is greater than the pressure threshold, the blocking member can move under the action of the fluid pressure in the catheter, so that the fluid flows out of the catheter from the pressure relief port, thereby reducing the fluid pressure in the catheter.

[0007] Optionally, the pressure relief mechanism further includes a liquid storage mechanism and a first shell, the first shell encloses a accommodating chamber, and the accommodating chamber is communicated with the catheter; when the pressure in the catheter is greater than the pressure threshold, the fluid flows out of the catheter from the pressure relief port and enters the accommodating chamber; the liquid storage mechanism has a filling chamber, the filling chamber is communicated with the accommodating chamber, and the liquid storage mechanism is used to store the fluid entering the accommodating chamber.

[0008] Optionally, the liquid storage mechanism is an elastic bladder, and the elastic bladder can expand after the fluid enters.

[0009] Optionally, the pressure relief mechanism further includes an elastic member, the elastic member is in contact with the blocking member; the elastic member is used to apply pressure to the blocking member;

[0010] The elastic member can contract when the pressure in the conduit is greater than the pressure threshold so that the blocking member is away from the pressure relief port; the elastic member can also return to its initial length when the pressure in the conduit is less than the pressure threshold so that the blocking member blocks the pressure relief port.

[0011] Optionally, the pressure relief mechanism further includes an adjusting component; the adjusting component is in contact with an end of the elastic member away from the blocking member; and the adjusting component is used to apply pressure to the elastic member.

[0012] Optionally, the adjusting component includes a handle and a cover plate connected to each other, and the cover plate is in contact with the elastic member; after the handle is subjected to force, pressure is applied to the elastic member through the cover plate.

[0013] Optionally, the catheter protection device further includes a display mechanism, which is in contact with the adjustment component and is used to display the pressure threshold.

[0014] Optionally, the display mechanism includes a gauge head, a driving member and a pointer, the gauge head having a cavity, the pointer and at least part of the driving member being arranged in the cavity; one end of the driving member is in contact with the adjusting member, and the other end is in contact with the pointer; the driving member is used to move under the drive of the adjusting member, and to drive the pointer to rotate after movement, and the pointer can indicate the pressure threshold after rotation.

[0015] Optionally, the cover plate includes a limit rod, which is connected to the handle or the cover plate, and has an inclined surface, and the driving member is in contact with the inclined surface; when the handle is rotated, the limit rod is driven to move, and after the limit rod moves, the driving member is driven to move through the cooperation between the inclined surface and the driving member.

[0016] Optionally, the display mechanism also includes a connecting component, which is located in the table header; the connecting component is connected to the driving member and the pointer respectively; a first gear is provided on the connecting component, and a second gear is provided on the pointer, and the first gear of the connecting component is used to rotate under the drive of the driving member, so as to drive the pointer to rotate through the cooperation of the first gear and the second gear.

[0017] Optionally, a rack is provided on the driving member, and a gear matching with the rack is provided on the pointer, and the driving member is used to drive the pointer to rotate through the matching of the rack and the gear after moving.

[0018] Optionally, the display mechanism further includes a dial, which is disposed in a cavity of the meter head, and the pointer is used to rotate relative to the dial to determine the pressure threshold.

[0019] Optionally, the blocking member is a deformable body; the blocking member can deform after being subjected to force and be limited to a position capable of blocking the pressure relief port; the blocking member can also move in a direction away from the pressure relief port under the action of the fluid pressure in the conduit, so that the fluid flows out of the conduit from the pressure relief port.

[0020] Optionally, the pressure relief mechanism further includes a pressing member and a second shell, the second shell encloses a chamber with an opening at one end, the chamber is communicated with the conduit, and the blocking member is placed in the chamber; the pressing member is movably connected to the second shell and can extend into the chamber to contact the blocking member;

[0021] The pressing member is used to apply pressure to the blocking member; the pressing member is also used to move in a direction out of the chamber after the blocking member blocks the pressure relief port, thereby leaving space for the movement of the blocking member.

[0022] Optionally, the blocking member is a conical structure, the maximum outer diameter of the blocking member is larger than the inner diameter of the pressure relief port, and the blocking member enters and is limited in the pressure relief port after being subjected to force.

[0023] Optionally, the blocking member is a conical structure, a receiving port connected to the pressure relief port is provided in the second shell, the maximum outer diameter of the blocking member is larger than the inner diameter of the receiving port, and the blocking member is limited in the receiving port after being subjected to force and abuts against the pressure relief port.

[0024] Optionally, the catheter protection device further includes a display mechanism, which is in contact with the blocking member and is used to display the pressure threshold.

[0025] To achieve the above object, the present invention further provides a catheter system, comprising a balloon catheter and any one of the catheter protection devices, wherein the catheter is connected to the balloon catheter; and the pressure relief mechanism is used to reduce the fluid pressure in the balloon catheter.

[0026] The present invention provides a catheter protection device and a catheter system, wherein the catheter system comprises a balloon catheter, a balloon inflator and a catheter protection device. The catheter protection device comprises a catheter and a pressure relief mechanism, wherein the pressure relief mechanism is connected to the catheter, and the catheter comprises a pressure relief port; the pressure relief mechanism comprises a blocking member, and a pressure threshold is preset, and when the pressure in the catheter is less than the pressure threshold, the blocking member blocks the pressure relief port; when the pressure in the catheter is greater than the pressure threshold, the blocking member can move under the action of the fluid pressure in the catheter, thereby reducing the fluid pressure in the catheter.

[0027] The catheter system introduces an in vitro catheter protection device on the catheter pipeline. The catheter protection device has a safe pressure relief function. When the actual pressure in the catheter exceeds the pressure threshold, the fluid pressure in the catheter can be reduced through the pressure relief mechanism to always control the actual pressure of the fluid in the catheter within the pressure threshold, ensuring that the fluid pressure in the catheter does not exceed the rated burst value, thereby preventing damage to blood vessels or expanded tissues caused by rupture and leakage of the balloon catheter, thereby ensuring safety during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a front view structural schematic diagram of the catheter protection device in the preferred embodiment 1 of the present invention;

[0029] Figure 2 Schematic diagram of the axial cross-sectional structure of the catheter protection device in the preferred embodiment 1 of the present invention, wherein the direction of arrow a represents the direction in which the fluid enters the accommodating cavity;

[0030] Figure 3 It is a schematic diagram of the three-dimensional structure of the catheter protection device in the second preferred embodiment of the present invention;

[0031] Figure 4 It is a front view structural schematic diagram of the catheter protection device in the second preferred embodiment of the present invention;

[0032] Figure 5 It is a schematic diagram of the axial cross-sectional structure of the catheter protection device in the second preferred embodiment of the present invention;

[0033] Figure 6 It is a schematic diagram of the top view of the display mechanism in the second preferred embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the axial cross-sectional structure of the catheter protection device in the third preferred embodiment of the present invention;

[0035] Figure 8 It is a schematic diagram of the top view of the display mechanism in the third preferred embodiment of the present invention.

[0036] Fig. 9It is a schematic diagram of the axial cross-sectional structure of a catheter protection device in a preferred embodiment of the fourth embodiment of the present invention;

[0037] Fig.10 This is a schematic diagram of the axial cross-sectional structure of a catheter protection device in another preferred embodiment of the fourth embodiment of the present invention.

[0038] In the figure: catheter 1; main pipeline 11; branch pipeline 12; pressure relief port 13; pressure relief mechanism 2; blocking member 21; first housing 22; pressure scale value 221; accommodating chamber 23; elastic member 24; adjusting member 25; handle 251; marking position 2511; cover plate 252; limit rod 253; inclined surface 2531; pressing member 26; protruding end 261; second housing 27; stopper 271; chamber 28;

[0039] Connecting member 3; connecting joint 31; locking joint 32; first sealing ring 33; liquid storage mechanism 4; display mechanism 5; meter head 51; cavity 511; upper cover 512; bottom cover 513; driving member 52; pointer 531; connecting assembly 54; connecting rod 541; gear rod 542; second sealing ring 55. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0041] The orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or position relationship shown in the drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0042] As used in this specification, the "distal end" generally refers to the end of the guiding catheter system that is away from the operator; the term "proximal end" is the opposite of the "distal end" and is generally the end of the guiding catheter system that is closer to the operator.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or a connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The exemplary embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may complement or be combined with each other.

[0045] <Example 1>

[0046] like Figure 1 As shown, a preferred embodiment of the present invention provides a catheter protection device, including a catheter 1 and a pressure relief mechanism 2, and the pressure relief mechanism 2 is connected to the catheter 1. In this embodiment, the catheter 1 has a Y-shaped connection body, that is, the catheter 1 includes a main line 11 and a branch line 12, the branch line 12 is connected to the main line 11, and the pressure relief mechanism 2 is installed on the branch line 12 of the catheter 1. In some other embodiments, the catheter 1 has only the main line 11, and the pressure relief mechanism is installed on the main line 11; in some other embodiments, the catheter 1 includes the main line 11 and the branch line 12, the pressure relief mechanism is installed on the main line 11, and the branch line 12 is used to pass the filling liquid or other equipment.

[0047] Reference Figure 2 As shown, the catheter 1 includes a pressure relief port 13, and the pressure relief mechanism 2 includes a blocking member 21. A pressure threshold is preset. When the pressure in the catheter 1 is less than the pressure threshold, the blocking member 21 blocks the pressure relief port 13; when the pressure in the catheter 1 is greater than the pressure threshold, the blocking member 21 can move under the action of the fluid pressure in the catheter 1, so that the fluid flows out of the catheter 1 from the pressure relief port 13, thereby reducing the fluid pressure in the catheter 1. It should be understood that the fluid in the catheter 1 refers to a liquid that can fill the balloon, such as a developing solution or saline. It should also be understood that the above-mentioned pressure threshold is the minimum pressure value applied to the blocking member 21 when the fluid flows out of the catheter 1.

[0048] With such a configuration, the catheter protection device has a safe pressure relief function during the use of the catheter 1. When the actual pressure in the catheter 1 exceeds the pressure threshold, the fluid pressure in the catheter 1 can be reduced through the pressure relief mechanism 2, so that the actual pressure of the fluid in the catheter 1 is always controlled within the pressure threshold, ensuring that the fluid pressure in the catheter 1 does not exceed the rated bursting pressure, thereby preventing the rupture and leakage of the balloon catheter from causing damage to the blood vessels or expanded tissues, thereby ensuring safety during the operation.

[0049] In actual use, the operator needs to set the pressure threshold of the plugging member 21 according to the rated bursting pressure (RBP) recommended in the instruction manual of the balloon dilatation catheter. Generally speaking, the set pressure threshold should be 1-2 atmospheres lower than the rated bursting pressure of the balloon dilatation catheter, so as to ensure that the fluid pressure of the catheter 1 never exceeds the rated bursting pressure, thereby preventing the rupture and leakage of the balloon catheter.

[0050] Reference Figure 1 and Figure 2 As shown, the pressure relief mechanism 2 further includes a first housing 22, which encloses a receiving chamber 23, which is connected to the catheter 1, preferably to the branch pipeline 12 of the catheter 1. The connection position between the receiving chamber 23 and the catheter 1 is the pressure relief port 13.

[0051] In some preferred embodiments, the blocking member 21 can apply pressure to the fluid in the catheter 1 (eg, the branch pipeline 12 ) when blocking the catheter 1 .

[0052] In more detail, when the fluid pressure in the catheter 1 is greater than the pressure threshold, the blocking member 21 can move toward the direction of entering the accommodating chamber 23 under the fluid pressure in the catheter 1, so that the fluid in the catheter 1 enters the accommodating chamber 23. For example, the fluid can move along Figure 2 The fluid enters the accommodating chamber 23 in the direction a in the figure. After the fluid enters the accommodating chamber 23, the fluid pressure in the conduit 1 can be reduced, and the actual pressure of the fluid in the conduit 1 is controlled within the pressure threshold. When the fluid pressure in the conduit 1 is less than the pressure threshold, the blocking member 21 can move back and continue to block the pressure relief port 13.

[0053] Continue to refer to Figure 1 and Figure 2 The pressure relief mechanism 2 further includes a liquid storage mechanism 4, which has a filling cavity (not numbered), which is connected to the accommodating cavity 23, and is used to store the fluid entering the accommodating cavity 23. In other words, the fluid entering the accommodating cavity 23 can flow into the liquid storage mechanism 4 for storage, so that the pressure relief mechanism 2 can continuously store the fluid in the catheter 1 to ensure the continuous operation of the pressure relief mechanism 2.

[0054] In a specific example, the liquid storage mechanism 4 is an elastic sac (i.e., an elastomeric balloon), which can expand after the fluid flows in, and can also shrink after the fluid flows out. With such a design, on the one hand, the volume of the elastic sac can be increased so that the liquid storage mechanism 4 can store more fluid; on the other hand, the elastic sac can remind the operator when the pressure value in the balloon catheter exceeds the pressure threshold, so that the operator can be informed that the fluid pressure in the catheter 1 has reached the pressure threshold. Generally speaking, if the volume of the elastic sac increases, it means that the pressure in the balloon catheter is close to the rated bursting pressure. After observing the increase in the volume of the elastic sac, the operator can stop inputting the filling fluid into the balloon catheter, or withdraw part of the filling fluid, thereby ensuring the safety of the operation.

[0055] In some embodiments, the liquid storage mechanism 4 also includes a liquid outlet, which is controllably connected to the outside world. After stopping the input of filling liquid into the balloon catheter or withdrawing part of the filling liquid, the liquid outlet can be controlled to be connected to the outside world, so that the fluid in the liquid storage mechanism 4 can flow out. With such a configuration, on the one hand, it can ensure that the pressure in the balloon catheter is lower than the pressure threshold. If the pressure in the balloon catheter is still higher than the pressure threshold after stopping the input of filling liquid into the balloon catheter or withdrawing part of the filling liquid, the pressure relief mechanism is still in an open state. After the liquid outlet is connected to the outside world, excess liquid will leave the balloon catheter and the catheter protection device through the liquid outlet, so that the pressure in the balloon catheter is further reduced. On the other hand, after the liquid in the liquid storage mechanism is discharged through the liquid outlet, it can prevent the pressure in the liquid storage mechanism from being too high and causing failure (for example, rupture of the elastic sac), so that the balloon protection device can continue to be used. When the pressure in the balloon catheter is too high later, the balloon protection device can relieve the pressure or remind the operator. Figure 1 and Figure 2 As shown, the present invention also provides a catheter system, including a balloon catheter (not shown) and a catheter protection device, wherein the catheter 1 is connected to the balloon catheter. The pressure relief mechanism is used to reduce the fluid pressure in the balloon catheter to prevent the balloon catheter from rupturing and leaking. Specifically, the pressure relief mechanism 2 is used to control the pressure in the catheter 1 so that the fluid pressure in the catheter 1 does not exceed the pressure threshold.

[0056] Reference Figure 2 As shown, in a specific embodiment, the catheter 1 is connected to the proximal end of the balloon catheter through a connector 3. In one example, the connector 3 preferably includes a connector 31, a locking connector 32 and a first sealing ring 33. Among them, one end of the connector 31 is against the end of the catheter 1, and the first sealing ring 33 is placed at the contact position, and the locking connector 32 is sleeved on the catheter 1 and is used to fix the connector 31 to the catheter 1; the other end of the connector 31 is used to connect to the balloon catheter.

[0057] Furthermore, the catheter system also includes a balloon inflator (not shown), which is connected to the catheter 1 (for example, via Figure 1 and Figure 2 The right opening of the catheter 1 shown is connected (the connection method may be threaded connection, clamping connection, etc.), and is used to inject filling medium into the catheter 1. The filler may be, but is not limited to, a syringe, an infusion pump, etc.

[0058] As a preferred embodiment, the pressure relief mechanism 2 further includes an elastic member 24, which is disposed in the accommodating cavity 23 and in contact with the blocking member 21. The elastic member 24 is used to apply pressure to the blocking member 21. The elastic member 24 can shrink when the pressure in the catheter 1 is greater than the pressure threshold, so that the blocking member 21 is away from the pressure relief port 13; the elastic member 24 can also return to the initial length (i.e., the length of the elastic member 24 before being pressurized) when the pressure in the catheter 1 is less than the pressure threshold, that is, after the pressure is removed, the elastic member 24 can stretch under the action of elastic potential energy, so that the blocking member 21 can re-block the pressure relief port 13.

[0059] Continue to refer to Figure 2 As shown, in this embodiment, the elastic member 24 is a spring, which is arranged on the side of the blocking member 21 away from the conduit 1. The blocking member 21 is preferably a plate and has a protruding end facing the spring. The blocking member 21 is used to abut against and block the pressure relief port 13 of the conduit 1, and the protruding end of the blocking member 21 is used to be inserted into the spring so that the blocking member 21 and the spring are fixedly connected.

[0060] In more detail, the spring pressure on the side of the blocking member 21 in contact with the spring is F 1 , F 1 =Kx, where K is the elastic coefficient of the spring and x is the deformation of the spring. The fluid pressure on one side of the plugging member 21 plugging the pressure relief port 16 is F 2 , F 2 =PA, where P is the pressure of the fluid and A is the contact area of ​​the fluid.

[0061] When F 1 >F 2 , that is, when the elastic force of the spring on the plugging member 21 is greater than the fluid pressure in the conduit 1, the plugging member 21 is always in the plugging position; when F 1 <F 2 That is, when the elastic force of the spring on the blocking member 21 is smaller than the fluid pressure in the catheter 1, the balance state on both sides of the blocking member 21 will be destroyed. At this time, the blocking member 21 moves toward the direction of entering the accommodating cavity 23 under the action of the fluid pressure, causing the fluid to flow out of the catheter 1 from the pressure relief port 13, thereby realizing the in vitro pressure relief protection of the catheter 1.

[0062] like Figure 1 and Figure 2As shown, the pressure relief mechanism 2 further includes an adjusting component 25, at least part of which is preferably disposed in the first housing 22. The adjusting component 25 contacts one end of the elastic member 24 away from the blocking member 21, that is, one end of the elastic member 24 contacts the blocking member 21, and the other end contacts the adjusting component 25. The adjusting component 25 is used to apply pressure to the elastic member 24, and the elastic member 24 drives the blocking member 21 to block the pressure relief port 13 after being pressurized.

[0063] In this embodiment, the adjusting component 25 is used to apply pressure to the spring. After being compressed, the spring can apply elastic force to the blocking member 21 so that the blocking member 21 always blocks the pressure relief port 13 when the fluid pressure applied to the blocking member 21 is less than the pressure threshold.

[0064] Continue to refer to Figure 1 and Figure 2 The adjusting component 25 includes a handle 251 and a cover plate 252 connected to each other. The cover plate 252 and at least a part of the handle 251 are preferably disposed in the first housing 22. The cover plate 252 contacts the elastic member 24. When the handle 251 is subjected to force (for example, being rotated or moved), pressure is applied to the elastic member 24 through the cover plate 252.

[0065] As a specific example, the handle 251 is sleeved on the first housing 22 and extends into the first housing 22 to contact the cover plate 252. The inner wall of the handle 251 has an internal thread, and the outer wall of the first housing 22 has an external thread matching the internal thread of the handle 251. The handle 251 can rotate relative to the first housing 22 and compress the spring through the cover plate 252. After the spring is compressed, it applies pressure to the blocking member 21, so that the blocking member 21 blocks the pressure relief port 13.

[0066] It should be noted that the pressure value applied by the cover plate 252 to the elastic member 24 is the pressure threshold. After being pressurized, the elastic member 24 applies pressure to the blocking member 21, so that when the fluid pressure in the conduit 1 applied to the blocking member 21 is less than the pressure threshold, the blocking member 21 blocks the pressure relief port 13.

[0067] The adjusting component 25 can adjust the pressure value applied to the elastic member 24 as needed, that is, the adjusting component 25 can adjust the pressure threshold to match the preset pressure required by different types of catheters 1. In actual use, the pressure threshold of the pressure relief mechanism 2 can be adjusted by turning the handle 251 clockwise or counterclockwise.

[0068] In a preferred embodiment, one of the first housing 22 and the handle 251 is provided with a pressure scale value 221, and the other of the first housing 22 and the handle 251 is provided with a marking position 2511. The handle 251 can rotate relative to the first housing 22 to determine the pressure threshold of the regulating component 25 by the pressure scale value 221 corresponding to the marking position 2511.

[0069] In actual operation, after knowing the pressure threshold corresponding to the catheter 1, the operator can rotate the handle 251 clockwise or counterclockwise. At this time, the mark position 2511 on the handle 251 is aligned with the specific value on the pressure scale value 221, which is the pressure threshold.

[0070] <Example 2>

[0071] The parts of this embodiment that are the same as those of the first embodiment will not be described in detail, and only the differences will be described below.

[0072] Reference Figure 3-4 As shown, in a preferred embodiment, the pressure relief mechanism 2 further includes a display mechanism 5, which is in contact with the adjusting component 25 and is used to display the pressure threshold applied by the adjusting component 25 to the elastic member 14. The display mechanism 5 can intuitively display the preset pressure applied by the adjusting component 25 to the blocking member 21, so as to realize the visualization of the preset pressure.

[0073] Reference Figure 5 and Figure 6 As shown, in an exemplary embodiment, the display mechanism 5 includes a meter head 51, a driving member 52 and a pointer 531. The meter head 51 has a cavity 511, and the meter head 51 is connected to the first housing 22. The pointer 531 and at least part of the driving member 52 are arranged in the cavity 511 of the meter head 51. One end of the driving member 52 contacts the adjustment component 25, and the other end contacts the pointer 531. The driving member 52 is used to move under the drive of the adjustment component 25, and is used to drive the pointer 531 to rotate after moving, and the pointer 531 can indicate the pressure threshold after rotating.

[0074] Reference Figure 5 In one example, the watch head 51 has an upper cover 512 and a bottom cover 513 , and the upper cover 512 and the bottom cover 513 are buckled together to form a cavity 511 .

[0075] Furthermore, the display mechanism 5 further includes a dial 532, which is disposed in the cavity 511 of the meter head 51. The pointer 531 is used to rotate relative to the dial 531 to facilitate reading the pressure threshold of the adjustment component 25. In more detail, the pointer 531 is connected to the driving member 52 and can rotate relative to the dial 532 under the drive of the driving member 52. The pointer 531 can indicate a specific value on the dial 531, which is the pressure threshold applied by the adjustment component 25 to the elastic member 24.

[0076] As an optional solution, the adjustment component 25 further includes a limit rod 253 (see Figure 5), the limiting rod 253 is connected to the handle 251 or the cover plate 252. The limiting rod 253 has an inclined surface 2531, and the driving member 52 is used to abut against the inclined surface 2531. When the handle 251 rotates, the limiting rod 253 is driven to rotate. After the limiting rod 253 moves, the driving member 52 is driven to move through the cooperation between the inclined surface 2531 and the driving member 52.

[0077] In one example, the limiting rod 253 is connected to the cover plate 252 and protrudes toward the direction close to the catheter 1. The driving member 52 is a driving rod, and the extending direction of the limiting rod 253 is substantially perpendicular to the extending direction of the driving rod 52, so that the limiting rod 253 drives the driving rod 52 to move along its own axial direction through the movement of the inclined surface 2531, and drives the pointer 531 to rotate after the movement.

[0078] Reference Figure 5 and Figure 6 In a specific embodiment, the display mechanism 5 further includes a connecting component 54, which is located in the cavity 511 of the meter head 51, and one end of the driving member 52 located in the cavity 511 is preferably bent into an arc. The connecting component 54 is respectively connected to the driving member 52 and the pointer 531, that is, the driving member 52 is connected to the pointer 531 through the connecting component 54.

[0079] The present application does not limit the bending angle of the driving member 52 in the cavity 511. The bending angle of the driving member 52 can be set as required, for example, it can exceed 180° (see Figure 6 ), which is also less than 90°.

[0080] In a specific embodiment, a first gear (unnumbered) is provided on the connecting component 54, and a second gear (unnumbered) is provided on the pointer 531. The first gear of the connecting component 54 is used to rotate under the drive of the driving member 52, so as to drive the pointer 531 to rotate through the cooperation of the first gear and the second gear.

[0081] In one example, refer to Figure 6 As shown, the connecting assembly 54 includes a connecting rod 541 and a gear rod 542. One end of the gear rod 542 is a straight rod with a receiving groove, and the other end is a first gear. One end of the connecting rod 541 is connected to the driving member 52, and the other end of the connecting rod 541 is placed in the receiving groove of the straight rod. When configured in this way, the driving member 52 moves along its own axial direction and drives the connecting rod 541 to rotate. After the connecting rod 541 rotates, it can drive the gear rod 542 to rotate. After the first gear of the gear rod 542 rotates, it drives the second gear to rotate, so as to drive the pointer 531 to rotate.

[0082] In other embodiments, the connecting assembly 54 may also include only one gear rod, and the driving member 52 drives the pointer 531 to rotate via the gear rod.

[0083] In this embodiment, the display mechanism 5 further includes a second sealing ring 55 (see Figure 6 ), the display mechanism 5 is threadedly connected to the first housing 22, and the second sealing ring 55 is placed at the connection portion between the display mechanism 5 and the first housing 22 to seal the connection portion.

[0084] Of course, in other embodiments, the catheter protection device may not be provided with the display mechanism 5 , and in this case, the operator can only obtain the preset pressure of the blocking member 21 through the specific value of the pressure scale value 221 corresponding to the marked position 2511 on the handle 251 .

[0085] <Example 3>

[0086] The parts of this embodiment that are the same as those of the second embodiment will not be described in detail, and only the differences will be described below.

[0087] Reference Figure 7 and Figure 8 As shown, in this embodiment, the display mechanism 5 does not include a connecting assembly, and the driving member 52 is directly connected to the pointer 531. Specifically, a rack is provided on the driving member 52, and a third gear matched with the rack is provided on the pointer 531. The driving member 52 is used to drive the pointer 531 to rotate through the cooperation of the rack and the third gear after moving. In this way, the driving member 52 can directly drive the pointer 531 to rotate after moving along its own axial direction, so as to simplify the structure of the display mechanism 5.

[0088] <Example 4>

[0089] The parts of this embodiment that are the same as those of Embodiment 1 and Embodiment 2 are not described in detail, and only the differences are described below.

[0090] In this embodiment, the blocking member 21 is a deformable body. The blocking member 21 can be deformed after being subjected to force and is limited to a position capable of blocking the pressure relief port 13, that is, the blocking member 21 is deformed after being subjected to force and can be limited after deformation to block the pressure relief port 13. The blocking member 21 can also move in a direction away from the pressure relief port 13 under the action of the fluid pressure in the conduit 1, so that the fluid flows out of the conduit 1 from the pressure relief port 13.

[0091] In more detail, when the pressure in the catheter 1 is lower than the pressure threshold, the blocking member 21 can be limited and block the pressure relief port 13; when the pressure in the catheter 1 is higher than the pressure threshold, the blocking member 21 can move to allow the fluid to flow out of the catheter 1 from the pressure relief port 13, thereby reducing the fluid pressure in the catheter 1.

[0092] Reference Fig. 9 and Fig.10As shown, the pressure relief mechanism 2 also includes a pressing member 26 and a second shell 27, and the second shell 27 encloses a chamber 28 with an opening at one end, and the chamber 28 is connected to the conduit 1. The blocking member 21 is placed in the chamber 28. The pressing member 26 is movably connected to the second shell 27, and can extend into the chamber 28 to contact the blocking member 21. The pressing member 26 is used to apply pressure to the blocking member 21. The pressing member 26 is also used to move in a direction of moving out of the chamber 28 after the blocking member 21 blocks the pressure relief port 13. After the pressing member 26 moves, a gap is formed between the pressing member 26 and the blocking member 21, thereby leaving room for the movement of the blocking member 21. When so configured, the blocking member 21 can move into the gap under the pressure of the fluid and gradually restore its shape until the pressure relief port 13 is opened.

[0093] In some preferred embodiments, the blocking member 21 is a conical structure, the maximum outer diameter of the blocking member 21 is larger than the inner diameter of the pressure relief port 13 , and the blocking member 21 enters and is limited in the pressure relief port 13 after being subjected to force.

[0094] Reference Fig. 9 As shown, in a specific example, the pressing member 26 is sleeved on the second housing 27 and can rotate and / or move relative to the second housing 27. The operator can rotate and / or move the pressing member 26 to compress the blocking member 21 through the pressing member 26, and at least part of the blocking member 21 is deformed after being compressed and pressed into the pressure relief port 13, so as to achieve the purpose of blocking the pressure relief port 13. After the blocking member 21 is limited, the pressing member 26 can be rotated and / or moved to form a gap between the blocking member 21 and the pressing member 26 for the blocking member 21 to move into.

[0095] In other preferred embodiments, the blocking member 21 is a conical structure, and a receiving port (not shown) connected to the pressure relief port 13 is provided in the second shell 27. The maximum outer diameter of the blocking member 21 is greater than the inner diameter of the receiving port. After being subjected to force, the blocking member 21 enters and is limited in the receiving port, and abuts against the pressure relief port 13.

[0096] Reference Fig.10 As shown, in another specific example, the pressing member 26 is sleeved on the second housing 27 and can rotate relative to the second housing 27. The pressing member 26 is provided with a protruding end 261 that can extend into the chamber 28, and the protruding end 261 is used to contact the blocking member 21. The inner wall of the second housing 27 is provided with a stopper 271 that surrounds the second housing 27 in a circumferential direction, and a receiving opening can be formed by the stopper 271. The operator can rotate and / or move the pressing member 26 to compress the blocking member 21 through the protruding end 261 of the pressing member 26, and at least part of the blocking member 21 is deformed after being compressed and pressed into the receiving opening, and at the same time abuts against the pressure relief port 13 to block the pressure relief port 13.

[0097] In a preferred embodiment, the catheter protection device further comprises a display mechanism 5 (see Fig.10), the display mechanism 5 is in contact with the blocking member 21 and is used to display the pressure threshold.

[0098] Specifically, the display mechanism 5 is a pressure display component. When the blocking member 21 is under pressure, the display mechanism 5 can detect and display the pressure exerted on the blocking member 21 by the moving distance of the blocking member 21. At this time, the pressure exerted on the blocking member 21 is the pressure threshold. When the blocking member 21 moves and restores its shape under the pressure of the fluid, the pressure value displayed by the display mechanism 5 gradually decreases; and after the blocking member 21 restores its shape, the pressure value of the display mechanism 5 returns to zero.

[0099] In summary, the catheter protection device provided by the present invention has a safe pressure relief function, which can reduce the fluid pressure in the catheter through the pressure relief mechanism when the actual pressure in the catheter exceeds the pressure threshold, so as to always control the actual pressure of the fluid in the catheter within the pressure threshold, ensuring that the fluid pressure in the catheter does not exceed the rated burst value, thereby preventing the rupture and leakage of the balloon catheter from causing damage to the blood vessels or expanded tissues, thereby ensuring safety during the operation.

[0100] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the protection scope of the present invention.

Claims

1. A catheter protection device, It is characterized in that It comprises a catheter and a pressure relief mechanism; the pressure relief mechanism is connected to the catheter, and the catheter comprises a pressure relief port; the pressure relief mechanism comprises a blocking member, and a pressure threshold is preset. When the pressure in the catheter is less than the pressure threshold, the blocking member blocks the pressure relief port; when the pressure in the catheter is greater than the pressure threshold, the blocking member can move under the action of the fluid pressure in the catheter, so that the fluid flows out of the catheter from the pressure relief port, thereby reducing the fluid pressure in the catheter.

2. The catheter protection device according to claim 1, It is characterized in that The pressure relief mechanism also includes a liquid storage mechanism and a first shell, the first shell encloses a accommodating chamber, and the accommodating chamber is communicated with the catheter; when the pressure in the catheter is greater than the pressure threshold, the fluid flows out of the catheter from the pressure relief port and enters the accommodating chamber; the liquid storage mechanism has a filling chamber, the filling chamber is communicated with the accommodating chamber, and the liquid storage mechanism is used to store the fluid entering the accommodating chamber.

3. The catheter protection device according to claim 2, It is characterized in that The liquid storage mechanism is an elastic bag, and the elastic bag can expand after the fluid enters.

4. The catheter protection device according to any one of claims 1 to 3, It is characterized in that The pressure relief mechanism further comprises an elastic member, the elastic member is in contact with the blocking member, and the elastic member is used to apply pressure to the blocking member; The elastic member can contract when the pressure in the conduit is greater than the pressure threshold so that the blocking member is away from the pressure relief port; the elastic member can also return to its initial length when the pressure in the conduit is less than the pressure threshold so that the blocking member blocks the pressure relief port.

5. The catheter protection device according to claim 4, It is characterized in that The pressure relief mechanism further comprises an adjusting component; the adjusting component is in contact with an end of the elastic member away from the blocking member; the adjusting component is used to apply pressure to the elastic member.

6. The catheter protection device according to claim 5, It is characterized in that The adjusting component comprises a handle and a cover plate connected to each other, wherein the cover plate is in contact with the elastic member; when the handle is subjected to force, pressure is applied to the elastic member through the cover plate.

7. The catheter protection device according to claim 6, It is characterized in that A display mechanism is also included, which is in contact with the regulating component and is used to display the pressure threshold.

8. The catheter protection device according to claim 7, It is characterized in that The display mechanism includes a meter head, a driving member and a pointer, the meter head has a cavity, the pointer and at least part of the driving member are arranged in the cavity; one end of the driving member is in contact with the adjusting member, and the other end is in contact with the pointer; the driving member is used to move under the drive of the adjusting member, and is used to drive the pointer to rotate after moving, and the pointer can indicate the pressure threshold after rotating.

9. The catheter protection device according to claim 8, It is characterized in that The adjusting component also includes a limit rod, which is connected to the handle or the cover plate, and has an inclined surface. The driving member is used to abut against the inclined surface. When the handle rotates, the limit rod is driven to move, and after the limit rod moves, the driving member is driven to move through the cooperation between the inclined surface and the driving member.

10. The catheter protection device according to claim 8, It is characterized in that The display mechanism also includes a connecting component, which is located in the table header; the connecting component is connected to the driving member and the pointer respectively; a first gear is provided on the connecting component, and a second gear is provided on the pointer, and the first gear of the connecting component is used to rotate under the drive of the driving member, so as to drive the pointer to rotate through the cooperation of the first gear and the second gear.

11. The catheter protection device according to claim 8, It is characterized in that The driving member is provided with a rack, and the pointer is provided with a gear matched with the rack. The driving member is used to drive the pointer to rotate through the cooperation of the rack and the gear after moving.

12. The catheter protection device according to claim 8, It is characterized in that The display mechanism also includes a dial, which is arranged in the cavity of the meter head; the pointer is used to rotate relative to the dial to determine the pressure threshold.

13. The catheter protection device according to any one of claims 1 to 3, It is characterized in that The blocking member is a deformable body; the blocking member can be deformed after being subjected to force and is limited to a position where it can block the pressure relief port; the blocking member can also move in a direction away from the pressure relief port under the action of the fluid pressure in the conduit, so that the fluid flows out of the conduit from the pressure relief port.

14. The catheter protection device according to claim 13, It is characterized in that The pressure relief mechanism further comprises a pressing member and a second shell, wherein the second shell encloses a chamber with an opening at one end, the chamber is communicated with the conduit, and the blocking member is placed in the chamber; the pressing member is movably connected to the second shell and can extend into the chamber to contact the blocking member; The pressing member is used to apply pressure to the blocking member; the pressing member is also used to move in a direction out of the chamber after the blocking member blocks the pressure relief port, thereby leaving space for the movement of the blocking member.

15. The catheter protection device according to claim 14, It is characterized in that The blocking member is a conical structure, the maximum outer diameter of the blocking member is greater than the inner diameter of the pressure relief port, and the blocking member enters and is limited in the pressure relief port after being subjected to force.

16. The catheter protection device according to claim 15, It is characterized in that The blocking member is a conical structure, a receiving port connected to the pressure relief port is arranged in the second shell, the maximum outer diameter of the blocking member is greater than the inner diameter of the receiving port, and the blocking member is limited in the receiving port after being subjected to force and abuts against the pressure relief port.

17. The catheter protection device according to claim 13, It is characterized in that It also includes a display mechanism, which is in contact with the blocking member and is used to display the pressure threshold.

18. A catheter system, It is characterized in that It comprises a balloon catheter and a catheter protection device as described in any one of claims 1 to 17, wherein the catheter is connected to the balloon catheter; and the pressure relief mechanism is used to reduce the fluid pressure in the balloon catheter.

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