CN110448286A - Invasive Pressure Sensor - Google Patents

Abstract

The present invention discloses a kind of invasive pressure sensor, sampling T-way, and the sampling T-way includes that first interface, the second interface being connected to respectively with first interface and blood sampling interface, the first interface are connected to for connecting with the blood vessel of subjects；Pressure test device, one end of the pressure test device are connected to the second interface, and the pressure test device is away from one end of the second interface for being connected to pressure test liquid；And liquid device is returned, described time liquid device is equipped with the accommodating chamber for storing pressure test liquid, and the accommodating chamber is connected to the pressure test device and the second interface respectively.Technical solution of the present invention is intended to blood remaining in pipeline returning to the intravascular of subjects, reduces the discomfort of subjects.

Description

Invasive Pressure Sensor

technical field

The invention relates to the technical field of medical instruments, in particular to an invasive pressure sensor.

Background technique

The medical invasive pressure sensor is an invasive arteriovenous pressure monitoring device, which can continuously and dynamically monitor the arterial pressure, central venous pressure, pulmonary artery pressure and left coronary artery pressure of the human body, and directly obtain the blood pressure Physiological parameters provide an objective basis for the diagnosis, treatment and prognosis estimation of clinical diseases, and greatly meet the clinical needs. Therefore, invasive pressure sensors have been widely used clinically. The existing invasive pressure sensor can not only monitor the arterial and venous pressure, but also set a blood sampling device on the pressure sensor to reduce the number of blood vessel punctures of the monitored person and reduce the pressure of the monitored person. Painful, but after using the blood sampling device on the invasive pressure sensor for blood sampling, some blood will remain in the pipeline of the invasive pressure sensor, causing discomfort to the monitored person.

The above content is only used to assist in understanding the technical solution of the present application, and does not mean that the above content is admitted as prior art.

Contents of the invention

The main purpose of the present invention is to provide an invasive pressure sensor, aiming at sending the residual blood in the pipeline back to the blood vessel of the monitored person, so as to reduce the discomfort of the monitored person.

In order to achieve the above object, an invasive pressure sensor proposed by the present invention includes:

A sampling three-way, the sampling three-way includes a first interface, a second interface respectively communicated with the first interface, and a blood collection interface, and the first interface is used to communicate with the blood vessels of the monitored person;

A pressure testing device, one end of the pressure testing device communicates with the second interface, and the end of the pressure testing device away from the second interface is used to communicate with the pressure testing liquid; and

A liquid return device, the liquid return device is provided with an accommodating cavity for storing pressure testing liquid, and the accommodating cavity is respectively communicated with the pressure testing device and the second interface.

Optionally, the liquid return device includes:

A liquid return cylinder, the liquid return cylinder is provided with the accommodation chamber, and one end of the liquid return cylinder is provided with a liquid return hole communicating with the accommodation chamber; and

A piston, the piston includes a connected piston head and a piston rod, the piston head can be movably arranged in the accommodating cavity, and the piston rod can be telescopically arranged at the end of the liquid return cylinder away from the liquid return hole ;

The piston rod moves relative to the liquid return barrel, and drives the piston head to move in the accommodating cavity so that the return liquid flows to the second interface through the liquid return hole.

Optionally, the liquid return cylinder includes a cylinder body and a cover body, the cover body covers the end of the cylinder body away from the liquid return hole, and surrounds the cylinder body to form the accommodation chamber , the piston rod is fixed to the cover, and extends through the cover into the accommodating cavity to connect with the piston head.

Optionally, the cover body is rotatably arranged relative to the cylinder body, the end surface of the cover body is protrudingly provided with a mounting cylinder, and the side wall of the mounting cylinder is provided with a first thread;

The piston rod is arranged in the installation cylinder, the side wall of the piston rod is provided with a second thread, the first thread is engaged with the second thread, and the cover rotates relative to the cylinder to The piston rod is driven to move relative to the barrel.

Optionally, the cover body further includes a filter cover, the filter cover is arranged on the end of the installation cylinder away from the accommodating cavity, and the filter cover filters the air entering the installation cylinder.

Optionally, the liquid return device further includes a gasket, the gasket is sleeved on the side wall of the piston rod and located in the accommodating chamber, and the gasket abuts against the inner wall of the barrel to The containing chamber is sealed.

Optionally, the liquid return device further includes a fixed seat, the fixed seat is connected to the cylinder, and a pipeline channel communicating with the liquid return hole is also formed between the fixed seat and the cylinder , one end of the pipeline channel communicates with the second interface, and the other end communicates with the pressure testing device.

Optionally, the end of the blood collection interface is provided with a connection seat, and the connection seat is provided with a blood collection port, and the blood collection port communicates with the blood collection device.

Optionally, a sealing rubber plug is provided in the connecting seat, and the sealing rubber plug seals the blood collection port, and the sealing rubber plug is provided with an extrusion hole. When the blood sampling device is matched with the connecting seat, The blood collection device squeezes the sealing rubber plug so that the extrusion hole communicates with the blood collection port and the first interface.

Optionally, the pressure sensor further includes an infusion set, the infusion set communicates with an end of the pressure testing device away from the liquid return device, and the infusion set is used for inputting pressure testing liquid.

The technical solution of the present invention provides a liquid return device between the sampling tee and the pressure test device, and the liquid return device is provided with an accommodating chamber for storing the pressure test liquid. When the pressure test is performed on the invasive pressure sensor, the pressure test device, the liquid return device and the second port are connected, and the first port in the sampling tee is connected with the second port. In this way, the monitored person's blood vessels are connected with the pressure test fluid, and the pressure test device transmits pressure from the monitored person's blood vessels to the pressure test fluid to obtain physiological parameters such as vascular systolic pressure, diastolic pressure, and mean arterial pressure of the measured person. It should be noted that the pressure test device, the liquid return device, the sampling tee, and the sampling tee and the blood vessels of the monitored person are all connected through connecting tubes. When sampling and drawing blood through an invasive pressure sensor, the blood sampling interface is connected to the first interface, and the blood of the monitored person can be obtained from the blood sampling interface for detection, etc. Piercing, less pain to be monitored. After the blood sampling is completed, there is still blood between the sampling tee and the blood vessel of the monitored person, which will cause discomfort to the tested person. The device uses the pressure test liquid in the liquid return device to send the blood remaining between the sampling tee and the blood vessel of the monitored person back to the blood vessel of the monitored person, so as to reduce the discomfort of the monitored person. In this way, it also avoids multiple punctures of the subject to draw blood, and there is a large amount of unused blood remaining in the connecting tube between the blood collection device and the puncture structure, which also avoids reducing the risk of frequent blood draws of the subject. symptoms of anemia.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative effort.

Fig. 1 is a structural schematic diagram of an implementation of the invasive pressure sensor of the present invention;

Fig. 2 is a schematic diagram of the structure of the sampling tee in Fig. 1;

Fig. 3 is a schematic structural view of the liquid return device in Fig. 1;

Fig. 4 is a cross-sectional view of the liquid return device in Fig. 3;

Fig. 5 is an exploded view of the liquid returning device in Fig. 3 .

Explanation of reference numbers:

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions among the components in a specific posture. If the specific posture changes, the directional indications will also be corresponding change accordingly.

In the present invention, unless otherwise specified and limited, the terms "connection" and "fixation" should be understood in a broad sense, for example, "fixation" can be a fixed connection, a detachable connection, or an integral body; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal communication between two elements or an interaction relationship between two elements, unless otherwise clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In addition, in the present invention, descriptions such as "first", "second" and so on are used for description purposes only, and should not be understood as indicating or implying their relative importance or implicitly indicating the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the meaning of "and/or" appearing in the whole text includes three parallel schemes, taking "A and/or B as an example", including scheme A, scheme B, or schemes satisfying both A and B. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present invention.

The present invention proposes an invasive pressure sensor 100 .

Referring to Fig. 1 and Fig. 2, in the embodiment of the present invention, the invasive pressure sensor 100 includes a sampling tee 10, and the sampling tee 10 includes a first interface 11 and a second interface 13 respectively communicated with the first interface 11 And the blood sampling interface 15, the first interface 11 is used to connect the blood vessels of the monitored person; the pressure detection device 50, one end of the pressure detection device 50 communicates with the second interface 13, and the pressure detection device 50 One end away from the second interface 13 is used to communicate with the pressure test liquid; and the liquid return device 30, the liquid return device 30 is provided with a chamber 3111 for storing the pressure test liquid, and the chamber 3111 is respectively connected to the pressure test liquid. The detection device 50 communicates with the second interface 13 .

The technical solution of the present invention provides a liquid return device 30 between the sampling tee 10 and the pressure test device, and the liquid return device 30 is provided with an accommodating chamber 3111 for storing the pressure test liquid. When the invasive pressure sensor 100 performs a pressure test, the pressure test device, the liquid return device 30, and the second interface 13 are communicated, and the first quarter interface in the sampling tee 10 is communicated with the second interface 13, so that the blood vessels of the monitored person Connected with the pressure testing fluid, the pressure testing device 50 transmits pressure to the pressure testing fluid from the blood vessels of the subject to obtain physiological parameters such as vascular systolic pressure, diastolic pressure and mean arterial pressure of the subject. It should be noted that the connection between the pressure testing device, the liquid return device 30 , the sampling tee 10 and between the sampling tee 10 and the blood vessels of the monitored person is all connected through connecting tubes. When blood sampling is performed through the invasive pressure sensor 100, the blood collection interface 15 communicates with the first interface 11, and the blood of the monitored person can be obtained from the blood collection interface 15 for detection, etc., thus avoiding the need for blood sampling and drawing. The patient's skin is punctured, reducing the pain of being monitored. After the blood sampling is completed, blood remains between the sampling tee 10 and the monitored person's blood vessels, which will cause discomfort to the detected person. The liquid return device 30 uses the pressure test liquid in the liquid return device 30 to send the blood remaining between the sampling tee 10 and the blood vessel of the monitored person back into the blood vessel of the monitored person, so as to reduce discomfort of the monitored person. In this way, multiple punctures and blood draws of the subject are also avoided, and a large amount of blood remains unused in the connecting tube between the blood collection device and the puncture structure 71, which also avoids reducing the risk of the subject being tested due to frequent blood draws. symptoms of anemia.

It should be noted that the blood vessel of the subject to be detected is punctured by the indwelling needle 90, and the indwelling needle 90 can be left on the subject to be monitored for several days, and the first interface 11 of the sampling tee 10 is connected with the indwelling needle 90 through a connecting tube , so as to realize the communication between the sampling tee 10 and the blood vessel of the subject. The pressure test fluid in the invasive pressure sensor 100 is usually vacuum-sealed in an infusion bag or an infusion bottle (not shown), and the pressure test fluid can be physiological saline or medical solution. Usually, the end of the pressure testing device away from the sampling tee 10 is also connected to an infusion set 70 through a connecting tube, the infusion set 70 includes a puncture structure 71 and a drip structure 73, the puncture structure 71 is used to pierce the infusion bag or infusion bottle, To obtain the pressure test fluid in the infusion bag or infusion bottle, the dripping structure 73 is used to control the flow rate of the pressure test fluid. Before the invasive pressure sensor 100 is used, it is necessary to detect each component of the invasive pressure sensor 100. For example, it is necessary to fill the connecting tube connected between the components with a pressure test liquid, and to remove internal air bubbles, and to test the pressure. The device 50 is connected to a monitor (not shown), and various parameters of the monitor are reset to zero, etc., and the accommodating chamber 3111 of the liquid return device 30 is also filled with the pressure test liquid during this process.

It should be noted that the pressure testing device 50 in this embodiment includes a pressure testing chip 51, and the pressure testing chip 51 collects the pressure variation of the pressure testing liquid in the pipeline and converts it into an electrical signal. The signal output structure 55 and The pressure test chip 51 is connected, and the pressure change electrical signal output by the pressure test chip 51 is transmitted to the monitoring instrument, and the monitoring instrument converts the electrical signal of pressure change into a visible waveform image for medical personnel to observe and count.

Further, in some embodiments, the pressure test device 50 also includes a zero return tee 57, which is arranged between the pressure test chip 51 and the liquid return device 30, when adjusting the invasive pressure sensor 100 , the zeroing tee 57 is at the highest position, and the level is used to make the zeroing tee 57 level with the heart center point being monitored, so that the obtained pressure monitoring data is more accurate.

Further, in some embodiments, the pressure testing device 50 also includes a flushing valve 53, which is arranged between the pressure testing chip 51 and the infusion set 70, and the flushing valve 53 is used to quickly fill the pipeline in the entire pressure sensor with pressure. Test liquid or eliminate air bubbles in the pipeline, etc.

3 to 5, in an embodiment of the present invention, the liquid return device 30 includes a liquid return cylinder 31 and a piston 33, the liquid return cylinder 31 is provided with the accommodation chamber 3111, and the liquid return cylinder 31 One end is provided with a liquid return hole 3113 communicating with the receiving chamber 3111; the piston 33 includes a connected piston head 333 and a piston rod 331, the piston head 333 can be movably arranged in the receiving chamber 3111, and the piston The rod 331 protrudes from the end of the liquid return cylinder 31 away from the liquid return hole 3113; the piston rod 331 moves relative to the liquid return cylinder 31, and drives the piston head 333 to move in the accommodating chamber 3111 so that The reflux liquid flows to the second interface 13 through the liquid return hole 3113 .

In this embodiment, by setting the liquid return device 30 as a structure including the liquid return cylinder 31 and the piston 33, during the test process before the use of the invasive pressure sensor 100, the piston 33 retreats, and the pressure test liquid is sucked and filled. The accommodating chamber 3111 , when the pressure testing fluid in the accommodating chamber 3111 needs to be used, the pressure testing fluid in the accommodating chamber 3111 can be sent out by pushing the piston 33 . In this embodiment, the liquid return device 30 is provided in the form of a liquid return cylinder 31 and a piston 33 , the structure is simple, and the suction and delivery of the pressure test liquid is convenient, and the operation is convenient.

In some embodiments, the end of the piston head 333 is sheathed with a rubber plug 35, and the rubber plug 35 has an interference fit with the inner side wall of the barrel 311 to seal the assembly gap between the piston 33 and the housing chamber 3111, ensuring that the housing chamber 3111 is sealed. sex.

3 to 5, in an embodiment of the present invention, the liquid return cylinder 31 includes a cylinder body 311 and a cover body 313, and the cover body 313 covers the side of the cylinder body 311 away from the liquid return hole 3113. end, and surrounds with the cylinder 311 to form the accommodating chamber 3111, the liquid return hole 3113 is arranged at the end of the cylinder 311, the piston rod 331 is fixed to the cover 313, and Extend through the cover body 313 into the accommodating chamber 3111 and connect with the piston head 333 .

In this embodiment, the liquid return cylinder 31 includes a cylinder body 311 and a cover body 313, wherein one end of the cylinder body 311 is provided with a liquid return hole 3113, and the liquid return hole 3113 communicates with the connecting pipe, and the pressure test liquid inside the chamber 3111 It communicates with the pressure test liquid in the connecting pipe through the liquid return hole 3113 . One end of the liquid return hole 3113 away from the liquid return cylinder 31 has an open structure, which is convenient for the installation of the piston 33, and the end of the liquid return hole 3113 away from the liquid return cylinder 31 is sealed by the cover body 313, so that the cover body 313 and the liquid return cylinder 31 encloses and forms an accommodating chamber 3111 for temporarily storing the pressure test fluid. The cover body 313 and the barrel body 311 may be detachably connected, may be detachably connected through threads, or may be detachably connected through buckles.

Referring to Fig. 4 and Fig. 5, in one embodiment of the present invention, the cover body 313 is rotatably arranged relative to the cylinder body 311, and the end surface of the cover body 313 is protruded with a mounting cylinder 3131, and the side of the mounting cylinder 3131 The wall is provided with a first thread 3311;

The piston rod 331 is arranged in the installation cylinder 3131, the side wall of the piston rod 331 is provided with a second thread 1311, the first thread 3311 is engaged with the second thread 1311, and the cover body 313 is opposite The barrel 311 rotates to drive the piston rod 331 to move relative to the barrel 311 .

In this embodiment, it needs to be explained that the cover body 313 and the cylinder body 311 are both circular, and the cover body 313 and the cylinder body 311 can rotate mutually after being connected by buckles, and the outer wall of the cylinder body 311 is provided with a sealing ring. The facility of the sealing ring can ensure the tightness of the cover body 313 when it rotates relative to the cylinder body 311, so as to avoid liquid leakage. By setting the mounting tube 3131 on the end face of the cover body 313, by setting the second thread 1311 on the side wall of the mounting tube 3131, and correspondingly setting the first thread 3311 on the side wall of the piston rod 331, when the cover body 313 is rotated, The first thread 3311 is engaged with the second thread 1311 to drive the piston rod 331 to move relative to the barrel 311 . The threaded connection between the piston rod 331 and the cover body 313 ensures the firmness between the piston rod 331 and the cover body 313 on the one hand, and on the other hand, the threaded connection can also ensure the relative movement of the piston rod 331 The distance is used to control the amount of pressure test liquid squeezed out of the chamber 3111, so as to achieve the purpose of precise control. It should be noted that the height of the installation cylinder 3131 is high, and the entire piston rod 331 can be accommodated inside the installation cylinder 3131 , avoiding the situation that the piston rod 331 is touched by mistake.

4 and 5, in one embodiment of the present invention, the cover body 313 further includes a filter cover 3135, and the filter cover 3135 is covered on the end of the installation cylinder 3131 away from the accommodating cavity 3111, so that The filter cover 3135 filters the air entering the installation cylinder 3131 .

In this embodiment, the filter cover 3135 and the installation cylinder 3131 may be an integral structure, or may be a detachable connection structure. The filter cover 3135 is provided with a filter structure, which can be a filter membrane, a filter net, etc., and the filter structure filters the air entering the installation cylinder 3131 to prevent unclean substances in the air from entering the installation cylinder 3131 with the air , the piston 33 and the containing chamber 3111 are polluted to ensure the cleanliness of the pressure test fluid and prevent unclean substances in the air from entering the body of the subject through the invasive pressure sensor 100 .

Referring to Fig. 4 and Fig. 5, in one embodiment of the present invention, the liquid return device 30 further includes a gasket 39 sleeved on the side wall of the piston rod 331 and located in the accommodating chamber 3111 , the gasket 39 abuts against the inner wall of the barrel 311 to seal the accommodating cavity 3111 .

In this embodiment, the sealing gasket 39 is provided inside the barrel 311 of the liquid return device 30 , which further improves the sealing performance of the containing chamber 3111 and prevents the pressure test liquid stored in the containing chamber 3111 from flowing out.

3 to 5, in an embodiment of the present invention, the liquid return device 30 further includes a fixed seat 37, the fixed seat 37 is connected to the cylinder 311, and the fixed seat 37 and the cylinder 311 A pipeline channel 371 communicating with the liquid return hole 3113 is also formed therebetween, one end of the pipeline channel 371 communicates with the second interface 13 , and the other end communicates with the pressure testing device.

In this embodiment, by setting the fixing seat 37, it is convenient to fix the entire liquid return device 30 at a designated position. The two ends of the pipeline channel 371 formed between the fixing seat 37 and the cylinder body 311 are used for connecting connecting pipes, so that the pressure test liquid can be sucked or pushed out from the pipeline channel 371 conveniently. It should be noted that the cylindrical body 311 and the fixing seat 37 are integrally formed by injection molding.

Referring to Fig. 2, in one embodiment of the present invention, the end of the blood collection interface 15 is provided with a connection seat 151, and the connection seat 151 is provided with a blood collection port 1511, and the connection seat 151 is used for connecting with the blood collection device (not shown). As shown in the figure), the blood collection port 1511 communicates with the blood collection device. The connecting seat 151 is provided with a sealing rubber plug 153, and the sealing rubber plug 153 seals the blood collection port 1511, and the sealing rubber plug 153 is provided with an extrusion hole. Finally, the blood collection device squeezes the sealing rubber plug 153 so that the squeeze hole communicates with the first interface 11 so as to collect the blood of the monitored person through the squeeze hole.

In this embodiment, the blood collection port is provided with a connection seat 151 , and the surface of the connection seat 151 is provided with a connection thread or a connection buckle (not shown), so as to facilitate the cooperation between the blood collection device and the connection seat 151 . A blood sampling port 1511 is arranged on the connection seat 151 , and the blood sampling port 1511 is sealed by a sealing rubber plug 153 . The end of the sealing rubber plug 153 is provided with an extruding hole. When blood collection is needed, the blood sampling device cooperates with the connecting seat 151, and the end of the blood sampling device squeezes the sealing rubber plug 153, thereby compressing the sealing rubber plug 153 at the end of the sealing rubber plug 153. The extrusion hole is stretched, so that the extrusion hole communicates with the first interface 11 , so as to collect the blood of the monitored person through the blood collection port 1511 . After the blood collection is finished, the blood collection device is separated from the connecting seat 151 , and the extrusion hole of the sealing rubber plug 153 is automatically healed after the external force is removed to realize the sealing of the blood collection port 1511 .

The above is only a preferred embodiment of the present invention, and does not therefore limit the patent scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or direct/indirect use All other relevant technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. An invasive pressure sensor, characterized in that, comprising: A sampling three-way, the sampling three-way includes a first interface, a second interface respectively communicated with the first interface, and a blood collection interface, and the first interface is used to communicate with the blood vessels of the monitored person; A pressure testing device, one end of the pressure testing device communicates with the second interface, and the end of the pressure testing device away from the second interface is used to communicate with the pressure testing liquid; and A liquid return device, the liquid return device is provided with an accommodating cavity for storing pressure testing liquid, and the accommodating cavity is respectively communicated with the pressure testing device and the second interface. 2. The invasive pressure sensor according to claim 1, wherein the liquid return device comprises: A liquid return cylinder, the liquid return cylinder is provided with the accommodation chamber, and one end of the liquid return cylinder is provided with a liquid return hole communicating with the accommodation chamber; and A piston, the piston includes a connected piston head and a piston rod, the piston head can be movably arranged in the accommodating cavity, and the piston rod can be telescopically arranged at the end of the liquid return cylinder away from the liquid return hole ; The piston rod moves relative to the liquid return barrel, and drives the piston head to move in the accommodating cavity so that the return liquid flows to the second interface through the liquid return hole. 3. The invasive pressure sensor according to claim 2, wherein the liquid return cylinder comprises a cylinder body and a cover body, and the cover body covers the end of the cylinder body away from the liquid return hole , and form the accommodating cavity surrounded by the barrel, the piston rod is fixed to the cover, and extends through the cover into the accommodating cavity to connect with the piston head. 4. The invasive pressure sensor according to claim 3, wherein the cover body is rotatably arranged relative to the cylinder body, the end surface of the cover body is protrudingly provided with a mounting cylinder, and the side wall of the mounting cylinder provided with a first thread; The piston rod is arranged in the installation cylinder, the side wall of the piston rod is provided with a second thread, the first thread is engaged with the second thread, and the cover rotates relative to the cylinder to The piston rod is driven to move relative to the barrel. 5. The invasive pressure sensor according to claim 4, wherein the cover body further comprises a filter cover, and the filter cover is arranged on the end of the installation cylinder away from the accommodating cavity, the A filter cap filters air entering the installation barrel. 6. The invasive pressure sensor according to claim 3, wherein the liquid return device further comprises a gasket, and the gasket is sleeved on the side wall of the piston rod and located in the accommodating cavity, The sealing gasket abuts against the inner wall of the barrel to seal the accommodating chamber. 7. The invasive pressure sensor according to claim 3, wherein the liquid return device further comprises a fixed seat, the fixed seat is connected to the cylinder body, and the space between the fixed seat and the cylinder body is A pipeline channel communicating with the liquid return hole is also formed, one end of the pipeline channel communicates with the second interface, and the other end communicates with the pressure testing device. 8. The invasive pressure sensor according to any one of claims 2 to 7, characterized in that, the end of the blood collection interface is provided with a connection seat, and the connection seat is provided with a blood collection port, and the blood collection port is connected to the blood collection port. The blood collection device is connected. 9. The invasive pressure sensor according to claim 8, wherein a sealing rubber plug is provided in the connecting seat, the sealing rubber plug seals the blood collection port, and the sealing rubber plug is provided with an extrusion hole , after the blood collection device is matched with the connecting seat, the blood collection device squeezes the sealing rubber plug, so that the extrusion hole communicates with the blood collection port and the first interface. 10. The invasive pressure sensor according to any one of claims 1 to 7, characterized in that, the pressure sensor further comprises an infusion set, the infusion set and the end of the pressure testing device away from the liquid return device For communication, the infusion set is used for inputting pressure test fluid.