Fluid return devices and invasive pressure sensors

Abstract

The present invention discloses a liquid return device and an invasive pressure sensor, wherein the liquid return device is used for an invasive pressure sensor, the invasive pressure sensor includes a blood sampling valve and a pressure test assembly, the liquid return device includes a liquid return cylinder, the liquid return cylinder is formed with a accommodating chamber, the side wall of the liquid return cylinder is also provided with a liquid inlet and a liquid outlet connected to the accommodating chamber; and a piston, the piston includes a piston head and a piston rod, the piston head is movably arranged in the accommodating chamber, the piston rod extends into the accommodating chamber and is connected to the surface of the piston head away from the liquid inlet and the liquid outlet, the piston rod is telescopic relative to the liquid return cylinder to drive the piston head to move in the accommodating chamber, so that the pressure test liquid flows out through the liquid outlet. The technical solution of the present invention optimizes the invasive pressure sensor, and sends the blood in the pipeline after blood sampling through the invasive pressure sensor back to the human body to avoid blood waste.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to a liquid return device and an invasive pressure sensor having the liquid return device. Background Art

[0002] The medical invasive pressure sensor is an invasive arteriovenous pressure monitoring device that can continuously and dynamically monitor the human body's arterial pressure, central venous pressure, pulmonary artery pressure, and left coronary artery pressure, and directly obtain the physiological parameters of blood pressure, providing an objective basis for the diagnosis, treatment, and prognosis of clinical diseases. Existing invasive pressure sensors are equipped with a blood sampling plug, through which the blood of the monitored person can be collected. However, after the blood is collected through the blood sampling plug, the blood inside the pipeline cannot be cleaned up, leaving blood in the pipeline, which not only causes a waste of blood, but also may pose a risk of blood infection.

[0003] The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are prior art. Summary of the invention

[0004] The main purpose of the present invention is to provide a liquid return device, which aims to optimize the invasive pressure sensor and return the blood in the pipeline after blood collection through the invasive pressure sensor to the human body to avoid blood waste.

[0005] To achieve the above object, the present invention provides a liquid return device for an invasive pressure sensor, wherein the invasive pressure sensor comprises a blood sampling valve and a pressure test assembly, and the liquid return device comprises:

[0006] A liquid return cylinder, wherein the liquid return cylinder is formed with a receiving chamber, and the side wall of the liquid return cylinder is further provided with a liquid inlet and a liquid outlet communicating with the receiving chamber, wherein the liquid inlet is used to communicate with the pressure test assembly, and the liquid outlet is used to communicate with the blood sampling valve; and

[0007] The piston comprises a piston head and a piston rod, wherein the piston head is movably disposed in the accommodating chamber, the piston rod extends into the accommodating chamber and is connected to the surface of the piston head away from the liquid inlet and the liquid outlet, and the piston rod is retracted relative to the liquid return cylinder to drive the piston head to move in the accommodating chamber so that the pressure test liquid flows out through the liquid outlet.

[0008] In one embodiment of the present invention, the liquid return cylinder has a length direction, the piston head is extended along the length direction of the liquid return cylinder, the piston rod includes a main rod body and two reinforcing rods, the main rod body is arranged between the two reinforcing rods, and the reinforcing rod and the main rod body are arranged along the length direction of the piston head.

[0009] In one embodiment of the present invention, the piston rod is further provided with a handle, and the handle is connected to the main rod body.

[0010] In one embodiment of the present invention, the liquid inlet and the liquid outlet are arranged opposite to each other at an end of the liquid return cylinder away from the piston rod.

[0011] In one embodiment of the present invention, the liquid return cylinder comprises a cylinder body and a cover body, the cylinder body is formed with a receiving groove, and the liquid inlet and the liquid outlet are arranged away from the opening of the receiving groove;

[0012] The cover body is detachably covered on the opening of the accommodating groove and encloses the accommodating groove to form the accommodating cavity. The cover body is provided with a clearance opening, and the piston rod at least partially passes through the clearance opening and extends out of the accommodating cavity.

[0013] In one embodiment of the present invention, the cylinder is provided with a first limiting structure at the opening of the accommodating groove, and the inner wall of the cover is provided with a second limiting structure. When the cover is covered with the accommodating groove, the first limiting structure cooperates with the second limiting structure to limit the cover from separating from the cylinder.

[0014] In one embodiment of the present invention, the liquid return device also includes a protective cover, which includes a fixed part, an extension part and a hand-held part connected in sequence, the protective cover is sleeved on the liquid return cylinder, the fixed part is fixed to the outer wall of the cylinder, and the hand-held part covers the cover body and the end of the piston rod away from the piston head.

[0015] In one embodiment of the present invention, the outer wall of the liquid return cylinder is formed with a first connector and a second connector at the liquid inlet and the liquid outlet, the liquid inlet is connected to the pressure testing assembly, and the liquid outlet is connected to the blood sampling valve.

[0016] In one embodiment of the present invention, the liquid return device also includes a fixing seat, which includes a fixing plate and two fixing buckles protruding from the surface of the fixing plate, the two fixing buckles respectively clamp and fix the first connecting head and the second connecting head, and a fixing hole is provided on the fixing plate. The fixing plate fixes the liquid return device through the cooperation of the connecting piece and the fixing hole.

[0017] The present invention also provides an invasive pressure sensor, which includes a blood sampling valve, a pressure testing assembly and the above-mentioned liquid return device, wherein the liquid inlet of the liquid return device is connected to the pressure testing assembly, and the liquid outlet is connected to the blood sampling valve.

[0018] In the technical solution of the present invention, a receiving chamber is provided on the liquid return tube of the liquid return device, and the receiving chamber is used to store pressure test liquid. A liquid inlet and a liquid outlet connected to the receiving chamber are also provided on the side wall of the liquid return tube. A piston can also be movably provided in the receiving chamber, and the piston head in the receiving chamber is controlled to move relative to the receiving chamber by operating the piston rod to inhale or press out the pressure test liquid stored in the receiving chamber. Before using the invasive pressure sensor, it is necessary to fill the pipeline of the pressure sensor with pressure test liquid. At this time, by pulling the piston rod outward, the pressure test liquid in the pipeline channel can be sucked into the receiving chamber from the liquid inlet. After the blood sampling operation is completed through the blood sampling valve of the invasive pressure sensor, the piston rod is pushed inward again, so that the pressure test liquid in the receiving chamber flows out through the liquid outlet. At this time, the pressure test liquid flowing out of the receiving chamber can return the blood left in the blood sampling valve and the catheter between the blood vessels of the monitored person to the body of the monitored person. The blood between the blood sampling valve and the monitored person is sent back to the monitored person's blood vessels by the pressure test fluid in the receiving chamber, avoiding waste of blood remaining in the catheter and the risk of infection caused by blood remaining in the catheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of an embodiment of a liquid return device of the present invention;

[0021] Figure 2 for Figure 1 Exploded view of the structure of the liquid return device;

[0022] Figure 3 for Figure 1 A cross-sectional view of the liquid return device;

[0023] Description of Figure Numbers:

[0024] Label name Label name 100 Liquid return device 33 Piston rod 10 Liquid return cylinder 331 Main rod 11 Cylinder 333 Reinforcement rod 111 Accommodation cavity 35 Sealing plug 112 The first limit structure 37 handle 113 Liquid inlet 50 Protective cover 115 Liquid outlet 51 Handheld 117 First connector 53 Extension 119 Second connector 55 Fixed part 13 Cover 17 Fixed seat 131 Give way 171 Fixed plate 133 The second limiting structure 173 Fixing holes 30 piston 175 Fixed buckle 31 Piston head

[0025] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect 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.

[0029] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] The present invention provides a liquid return device 100 .

[0031] Reference Figures 1 to 3 In one embodiment of the liquid return device 100 of the present invention, the liquid return device 100 is used for an invasive pressure sensor, the invasive pressure sensor (not shown) includes a blood sampling valve (not shown) and a pressure test assembly (not shown), and the liquid return device 100 includes:

[0032] A liquid return cylinder 10, wherein the liquid return cylinder 10 is formed with a accommodating chamber 111, and the side wall of the liquid return cylinder 10 is also provided with a liquid inlet 113 and a liquid outlet 115 connected to the accommodating chamber 111, wherein the liquid inlet 113 is used to communicate with the pressure testing component, and the liquid outlet 115 is used to communicate with the blood sampling valve; and a piston 30, wherein the piston 30 includes a piston head 31 and a piston rod 33, wherein the piston head 31 is movably arranged in the accommodating chamber 111, the piston rod 33 extends into the accommodating chamber 111 and is connected to the surface of the piston head 31 away from the liquid inlet 113 and the liquid outlet 115, and the piston rod 33 is retracted relative to the liquid return cylinder 10 to drive the piston head 31 to move in the accommodating chamber 111, so that the pressure testing liquid flows out through the liquid outlet 115.

[0033] In the technical solution of one embodiment of the present invention, a receiving chamber 111 is provided on the liquid return cylinder 10 of the liquid return device 100, and the receiving chamber 111 is used to store pressure test liquid. A liquid inlet 113 and a liquid outlet 115 connected to the receiving chamber 111 are also provided on the side wall of the liquid return cylinder 10. A piston 30 can also be movably provided in the receiving chamber 111, and the piston head 31 in the receiving chamber 111 is controlled to move relative to the receiving chamber 111 by operating the piston rod 33 to inhale or press out the pressure test liquid stored in the receiving chamber 111. Before using the invasive pressure sensor, all pipelines in the invasive pressure sensor need to be filled with pressure test liquid. At this time, by pulling the piston rod 33 outward, the pressure test liquid in the pipeline channel can be sucked into the receiving chamber 111 from the liquid inlet 113. After the blood sampling operation is completed through the blood sampling valve of the invasive pressure sensor, the piston rod 33 is pushed inward to allow the pressure test fluid in the accommodating chamber 111 to flow out through the liquid outlet 115. At this time, the pressure test fluid flowing out of the accommodating chamber 111 can return the blood retained in the catheter between the blood sampling valve and the monitored person's blood vessel to the body of the monitored person. The blood between the blood sampling valve and the monitored person is returned to the inside of the monitored person's blood vessel by the pressure test fluid in the accommodating chamber 111, thereby avoiding the waste of blood remaining in the catheter and the risk of infection caused by blood remaining in the catheter.

[0034] It should be noted that the liquid return cylinder 10 is made of plastic, and the liquid inlet 113 and the liquid outlet 115 are both arranged on the side wall of the accommodating chamber 111, which can ensure the strength of the liquid return device 100. When the liquid return device 100 is connected to the pressure test assembly and the blood sampling valve, it can have sufficient anti-torque force to avoid the situation where the liquid return device 100 is broken due to local stress concentration.

[0035] Reference Figures 1 to 3In one embodiment of the present invention, the liquid return cylinder 10 has a length direction, the piston head 31 is extended along the length direction of the liquid return cylinder 10, the piston rod 33 includes a main rod body 331 and two reinforcing rods 333, the main rod body 331 is arranged between the two reinforcing rods 333, and the reinforcing rods 333 and the main rod body 331 are arranged along the length direction of the piston head 31.

[0036] In the technical scheme of one embodiment of the present invention, the liquid return cylinder 10 has a length direction, so that the liquid return cylinder 10 is roughly a flat cylindrical structure, and the flat liquid return cylinder 10 is convenient for operators to hold by hand. The shape of the piston head 31 is adapted to the inner wall of the liquid return cylinder 10, so that the piston head 31 also has a length direction, and the piston rod 33 is convexly arranged on the surface of the piston head 31. In order to improve the strength of the piston rod 33, the piston rod 33 includes a main rod body 331 and a reinforcing rod 333, and the setting of the reinforcing rod 333 can effectively improve the strength of the piston rod 33. And the number of the reinforcing rod 333 is at least two, and at least two reinforcing rods 333 are respectively located on both sides of the main rod body 331. The number of the reinforcing rod 333 is also multiple, and multiple reinforcing rods 333 are symmetrically arranged on both sides of the main rod body 331. The reinforcing rod 333 and the main rod body 331 are arranged along the length direction of the piston head 31, which can ensure that the piston head 31 is evenly stressed during the pushing process, and avoid the tilting of the piston head 31 caused by uneven stress, which affects the flow rate of the pressure test fluid.

[0037] It should be made clear that the main rod body 331 and the reinforcing rod 333 can be spaced apart, so that the material of the piston rod 33 can be saved and the material cost of the piston rod 33 can be reduced.

[0038] Reference Figures 1 to 3 In one embodiment of the present invention, the piston rod 33 is further provided with a handle 37 , and the handle 37 is connected to the main rod body 331 .

[0039] In the technical solution of one embodiment of the present invention, a buckle structure is formed at one end of the main rod body 331 away from the piston head 31, and a buckle groove is provided inside the handle 37. The handle 37 and the main rod body 331 are fixedly connected by the buckle and the buckle groove. By providing the handle 37, the contact area can be increased, which is convenient for operators to hold and operate by hand.

[0040] In some embodiments, the surface of the main rod 331 is provided with reinforcing ribs (not shown), which can improve the strength of the main rod 331. It should be noted that the surface of the cover 13 away from the cylinder 11 is also provided with a guide structure (not shown), which guides the movement of the main rod 331.

[0041] In some embodiments, the side wall of the reinforcing rod 333 at one end away from the piston head 31 is also formed with an arc-shaped gripping portion (not shown), so that the operator can hold the gripping portion to apply external force to the reinforcing rod 333. A limiting platform is also provided on the side wall of the reinforcing rod 333. When the limiting platform abuts against the cover body 13, the limiting platform (not shown) abuts against the inner surface of the cover body 13, thereby limiting the distance that the piston rod 33 can be pulled out, and avoiding excessive pulling.

[0042] In some embodiments, a material reduction area (not shown) is further provided on one side of the reinforcing rod 333 close to the main rod body 331, so that the reinforcing rod 333 has a shape that increases gradually from the end close to the piston head 31 toward the end away from the piston head 31. In this way, on the one hand, the strength of the reinforcing rod 333 can be ensured, and on the other hand, the reinforcing rod 333 can be deformed to a certain extent during use, so that the end portion is conveniently inserted into the clearance opening 131, thereby improving the hand feel.

[0043] A sealing rubber plug 35 is also sleeved on the piston head 31, and the sealing rubber plug 35 abuts against the inner wall of the liquid return cylinder 10, thereby improving the sealing performance between the liquid return cylinder 10 and the sealing rubber plug 35, and also helping to maintain the pressure of the entire bed pressure sensor. The material of the sealing rubber plug 35 can be rubber or silicone, and the shape of the sealing rubber plug 35 is adapted to the shape of the piston head 31.

[0044] Reference Figures 1 to 3 In one embodiment of the present invention, the liquid inlet 113 and the liquid outlet 115 are relatively arranged at an end of the liquid return cylinder 10 away from the piston rod 33.

[0045] In the technical solution of an embodiment of the present invention, the liquid inlet 113 and the liquid outlet 115 are arranged relative to each other, that is, the liquid outlet 115 and the liquid inlet 113 are on the same horizontal line, which is convenient for the circulation of the pressure test and keeps the pressure test liquid in the accommodating chamber 111 balanced. In addition, the liquid inlet 113 and the liquid outlet 115 are arranged relative to each other, which is also convenient for processing and molding.

[0046] Reference Figures 1 to 3 In one embodiment of the present invention, the liquid return cylinder 10 includes a cylinder body 11 and a cover body 13, the cylinder body 11 is formed with a receiving groove (not shown), and the liquid inlet 113 and the liquid outlet 115 are arranged away from the opening of the receiving groove;

[0047] The cover body 13 is detachably covered on the opening of the receiving groove and encloses the receiving groove to form the receiving cavity 111 . The cover body 13 is provided with a clearance opening 131 , and the piston rod 33 at least partially passes through the clearance opening 131 and extends out of the receiving cavity 111 .

[0048] In one embodiment of the present invention, the liquid return cylinder 10 is configured to include a structure of a cylinder body 11 and a cover body 13, which is convenient for the installation of the piston 30. It should be noted that the opening 131 on the cover body 13 can be one or multiple openings arranged at intervals. When the openings 131 on the cover body 13 are multiple openings arranged at intervals, the main rod body 331 and the reinforcing rod 333 of the piston rod 33 are arranged at intervals, and the main rod body 331 and the reinforcing rod 333 are respectively penetrated in a opening 131, so that the size of the opening 131 can be reduced, and the sealing effect in the accommodating chamber 111 can be improved.

[0049] Reference Figure 3 In one embodiment of the present invention, the cylinder body 11 is provided with a first limiting structure 112 at the opening of the receiving groove, and the inner wall of the cover body 13 is provided with a second limiting structure 133. When the cover body 13 covers the receiving groove, the first limiting structure 112 cooperates with the second limiting structure 133 to limit the cover body 13 from separating from the cylinder body 11.

[0050] In one embodiment of the present invention, the cylinder 11 and the cover 13 are detachably connected by the cooperation of the first limiting structure 112 and the second limiting structure 133. The first limiting structure 112 and the second limiting structure 133 have various forms, for example, they can be buckles and slots, that is, one of the buckles and slots is provided on the outer wall of the cylinder 11, and the other of the buckles and slots is provided on the cover 13, and the cylinder 11 and the cover 13 are detachably connected by the buckles and slots. The first limiting structure 112 and the second limiting structure 133 can also be other structures, for example, the outer wall of the cylinder 11 is provided with a flange (not marked), and the inner wall of the cover 13 is provided with a limiting rib (not marked), and when the cover 13 is covered on the accommodating groove, the limiting rib abuts against the flange to limit the cover 13 from sliding out of the cylinder 11. There are many forms of the first limiting structure 112 and the second limiting structure 133 , as long as they can fix the cover body 13 and the cylinder body 11 , which are not listed here one by one.

[0051] Reference Figures 1 to 3 In one embodiment of the present invention, the liquid return device 100 also includes a protective cover 50, and the protective cover 50 includes a fixing portion 55, an extension portion 53 and a hand-held portion 51 connected in sequence. The protective cover 50 is sleeved on the liquid return cylinder 10, and the fixing portion 55 is fixed to the outer wall of the cylinder body 11. The hand-held portion 51 covers the cover body 13 and the end of the piston rod 33 away from the piston head 31.

[0052] In one embodiment of the present invention, the material of the protective cover 50 is an elastic material such as rubber or silicone, and the protective cover 50 is roughly a cylindrical structure with an opening. Among them, the fixing portion 55 is provided with an opening of the protective cover 50. It can be understood that the opening of the fixing portion 55 is smaller than the outer diameter of the cylinder 11. When the protective cover 50 is sleeved on the outer surface of the cylinder 11, the fixing portion 55 can be fixed to the outer surface of the cylinder 11. The extension portion 53 is corrugated. When the piston rod 33 is pushed, the extension portion 53 can shrink and extend with the movement of the piston rod 33. The hand-held portion 51 is sleeved on the end of the piston rod 33 away from the piston head 31. The setting of the protective cover 50 can prevent the outside air from entering the accommodating chamber 111 and prevent the outside air from polluting the inner wall of the accommodating chamber 111. At the same time, it can also improve the user's feel.

[0053] Reference Figures 1 to 3 In one embodiment of the present invention, the outer wall of the liquid return cylinder 10 is formed with a first connector 117 and a second connector 119 at the liquid inlet 113 and the liquid outlet 115, the liquid inlet 113 is connected to the pressure testing assembly, and the liquid outlet 115 is connected to the blood sampling valve.

[0054] In one embodiment of the present invention, the first connector 117, the second connector 119, and the liquid return cylinder 10 are an integrated structure, all made of plastic material, and are integrally formed by injection molding, so that the strength of the first connector 117 and the second connector 119 can be ensured. The arrangement of the first connector 117 and the second connector 119 facilitates the connection between the pressure test assembly and the blood sampling valve.

[0055] It should be noted that the pressure test assembly is connected to the first connector 117 through a catheter, and the blood sampling valve is connected to the second connector 119 through a catheter. The catheter is respectively sleeved on the outer side walls of the first connector 117 and the second connector 119. It should be noted that in order to ensure that the catheter is firmly connected to the first connector 117 and the second connector 119, a connecting thread (not shown) can be provided on the outer side walls of the first connector 117 and the second connector 119, or the outer diameters of the first connector 117 and the second connector 119 are both reduced from one end of the side wall of the liquid return cylinder 10 to one end away from the side wall of the liquid return cylinder 10, so that the stability of the catheter being fixed to the first connector 117 and the second connector 119 can be ensured, and the catheter can be prevented from being separated from the first connector 117 and the second connector 119.

[0056] Reference Figures 1 to 3In one embodiment of the present invention, the liquid return device 100 also includes a fixing seat 17, the fixing seat 17 includes a fixing plate 171 and two fixing buckles 175 protruding from the surface of the fixing plate 171, the two fixing buckles 175 respectively clamp and fix the first connecting head 117 and the second connecting head 119, the fixing plate 171 is provided with a fixing hole 173, and the fixing plate 171 fixes the liquid return device 100 through the cooperation of the connecting piece and the fixing hole 173.

[0057] In one embodiment of the present invention, the fixing seat 17 is used to fix the entire reflux device. Wherein, the fixing seat 17 includes a square fixing plate 171, and the fixing buckles 175 are convexly arranged on the opposite sides of the fixing plate 171, and the ends of the fixing buckles 175 are bent into a hook shape, and the first connector 117 and the second connector 119 are clamped inside the hook to realize the fixing of the fixing seat 17 and the liquid return cylinder 10. The fixing hole 173 on the fixing plate 171 is the same as fixing the entire fixing plate 171 on the test frame (not shown). The connector can be a positioning plate convexly arranged on the test frame, and the positioning plate is inserted in the fixing hole 173 to fix the entire fixing seat 17, and then the entire liquid return device 100 is fixed on the fixing plate 171. There can be multiple fixing holes 173, and they are spaced between two fixing buckles 175, and multiple fixing holes 173 can improve the firmness of fixing the fixing seat 17. Furthermore, the fixing hole 173 may be in an elongated shape, which matches the shape of the positioning plate (not shown) to improve the firmness of the fixation of the liquid return device 100 .

[0058] The present invention also proposes an invasive pressure sensor, which includes a blood sampling valve (not shown), a pressure testing assembly (not shown) and a liquid return device 100. The specific structure of the liquid return device 100 refers to the above embodiment. Since the invasive pressure sensor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0059] The first connector of the liquid return device 100 is connected to the pressure test assembly through a catheter, the second connector of the liquid return device 100 is connected to the blood sampling valve through a catheter, and the end of the blood sampling valve away from the liquid return device 100 is connected to the blood vessel of the monitored person through an indwelling needle. The end of the pressure test assembly away from the liquid return device 100 is connected to the pressure test liquid, and the pressure test liquid fills the entire pipeline channel of the pressure sensor. It can be understood that a chip (not shown) is provided inside the pressure test assembly, and the chip converts the pressure change in the catheter into an electrical signal and transmits it to the display terminal to obtain various physiological parameters of the blood pressure of the monitored person.

[0060] It should be noted that when the blood sampling operation is performed through the blood sampling valve, the handle of the blood sampling valve is turned to cut off the pipeline between the blood sampling valve and the liquid return device 100. When the blood sampling operation is completed, the handle of the blood sampling valve is turned again to open the passage between the blood sampling valve and the liquid return device 100. At this time, the pressure test fluid in the liquid return device 100 can return the blood between the monitored blood vessel and the blood sampling valve to the body of the monitored person.

[0061] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A liquid return device for an invasive pressure sensor, wherein the invasive pressure sensor comprises a blood sampling valve and a pressure test assembly, characterized in that: The liquid return device comprises: A liquid return cylinder, wherein the liquid return cylinder is formed with a receiving chamber, and the side wall of the liquid return cylinder is further provided with a liquid inlet and a liquid outlet communicating with the receiving chamber, wherein the liquid inlet is used to communicate with the pressure test assembly, and the liquid outlet is used to communicate with the blood sampling valve; and A piston, wherein the piston comprises a piston head and a piston rod, wherein the piston head is movably disposed in the accommodating chamber, the piston rod extends into the accommodating chamber and is connected to a surface of the piston head away from the liquid inlet and the liquid outlet, and the piston rod is retracted relative to the liquid return cylinder to drive the piston head to move in the accommodating chamber so that the pressure test liquid flows out through the liquid outlet; The liquid return cylinder has a length direction, the piston head is extended along the length direction of the liquid return cylinder, the piston rod comprises a main rod body and at least two reinforcing rods, the main rod body is arranged between at least two reinforcing rods, and the reinforcing rod and the main rod body are arranged along the length direction of the piston head; The liquid return cylinder comprises a cylinder body and a cover body, wherein the cylinder body is formed with a receiving groove, wherein the liquid inlet and the liquid outlet are arranged away from the opening of the receiving groove, and the liquid outlet and the liquid inlet are arranged at the same horizontal line; the cover body is detachably covered with the opening of the receiving groove, and is enclosed with the receiving groove to form the receiving cavity, and the cover body is provided with a clearance opening, and the piston rod at least partially passes through the clearance opening and extends out of the receiving cavity; The cylinder is provided with a first limiting structure at the opening of the receiving groove, and the inner wall of the cover is provided with a second limiting structure. When the cover is covered with the receiving groove, the first limiting structure cooperates with the second limiting structure to limit the cover from being separated from the cylinder; the liquid return device also includes a protective cover, which includes a fixing portion, an extending portion and a hand-held portion connected in sequence, the protective cover is sleeved on the liquid return cylinder, the fixing portion is fixed to the outer side wall of the cylinder, and the hand-held portion covers the cover and the end of the piston rod away from the piston head; The liquid inlet and the liquid outlet are relatively arranged at one end of the liquid return cylinder away from the piston rod; the outer wall of the liquid return cylinder is formed with a first connector and a second connector at the liquid inlet and the liquid outlet, the liquid inlet is connected to the pressure test assembly, and the liquid outlet is connected to the blood sampling valve; the end of the pressure test assembly away from the liquid return device is connected to the pressure test liquid, and the pressure test liquid fills the entire pipeline channel of the pressure sensor; the liquid return device also includes a fixing seat, which includes a fixing plate and two fixing buckles convexly arranged on the surface of the fixing plate, the two fixing buckles respectively clamp and fix the first connector and the second connector, the fixing plate is provided with a fixing hole, and the fixing plate fixes the liquid return device through the cooperation of the connecting piece and the fixing hole; Before using the invasive pressure sensor, it is necessary to fill the pipeline of the invasive pressure sensor with pressure test liquid, and by pulling the piston rod outward, the pressure test liquid in the pipeline channel is sucked into the accommodating chamber from the liquid inlet; after the blood sampling operation is completed through the blood sampling valve of the invasive pressure sensor, the piston rod is pushed inward again to make the pressure test liquid in the accommodating chamber flow out through the liquid outlet, and the pressure test liquid flowing out of the accommodating chamber returns the blood retained in the catheter between the blood sampling valve and the blood vessel of the monitored person to the body of the monitored person; wherein, when the blood sampling operation is performed through the blood sampling valve, the handle of the blood sampling valve is turned to cut off the pipeline between the blood sampling valve and the liquid return device, and when the blood sampling operation is completed, the handle of the blood sampling valve is turned again to open the passage between the blood sampling valve and the liquid return device, and at this time, the pressure test liquid in the liquid return device can return the blood between the monitored blood vessel and the blood sampling valve to the body of the monitored person.

2. The liquid return device according to claim 1, characterized in that: The piston rod is also provided with a handle, and the handle is connected to the main rod body.

3. An invasive pressure sensor, characterized in that: The invasive pressure sensor comprises a blood sampling valve, a pressure testing assembly and a liquid return device as described in any one of claims 1 to 2, wherein the liquid inlet of the liquid return device is connected to the pressure testing assembly, and the liquid outlet is connected to the blood sampling valve.

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