Integrated central venous pressure measuring device through peripheral indwelling needle

Abstract

The invention relates to the technical field of medical instruments, and discloses a peripheral indwelling needle integrated central venous pressure measuring device which comprises an indwelling needle and a hose fixedly connected to the input end of the indwelling needle, and a connecting assembly is installed at the end, away from the indwelling needle, of the hose. The end face, away from the remaining needle, of the hose is fixedly connected with a plug, the outer surface of the hose is slidably connected with a pipe clamp, and the connecting assembly comprises a connecting base fixedly connected to the outer surface of the plug. A convex plate is pressed to drive a sealing block to slide, so that a sliding cavity is in negative pressure, a baffle is opened to facilitate connection of an injector and a plug, a protection structure can prevent infection, after connection, the pressure of the convex plate is rapidly increased to drive a sealing disc to slide, two limiting cavities are pressurized, and hose saline enters a glass measuring tube through a transverse groove to drive a silicon rubber plate to slide; the central venous pressure is directly and accurately measured through the scale marks, and reliable basis is provided for clinic.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to an integrated central venous pressure measuring device via a peripherally placed needle. Background Art

[0002] Peripheral indwelling needles are a very commonly used medical device in modern clinical medicine. Their appearance has brought significant benefits to patients and greatly reduced the pain that patients endure from repeated punctures. In actual medical scenarios, especially for patients who need long-term infusion treatment, such as patients with chronic diseases and postoperative rehabilitation patients, if puncture is performed every time an infusion is performed, it will not only damage the patient's blood vessels and increase the patient's physical burden, but also cause fear and anxiety to the patient psychologically. The use of peripheral indwelling needles only requires one puncture and can be used multiple times within a certain period of time, effectively avoiding the trouble of repeated punctures and improving the patient's medical experience.

[0003] However, although the peripheral catheter performs well in intravenous infusion, it has certain limitations. The original intention of the design of the traditional peripheral catheter is mainly to meet the needs of intravenous infusion. Its structure and function determine that it cannot be directly used for central venous pressure measurement. As an important indicator reflecting right heart function and blood volume, central venous pressure is of vital guiding significance for clinicians to judge the patient's condition and formulate reasonable treatment plans, especially in terms of fluid management, shock treatment and cardiovascular disease treatment. However, due to the lack of key components such as pressure sensing devices, signal transmission and processing systems required for accurate measurement of central venous pressure, traditional peripheral catheters cannot directly obtain central venous pressure data. This limitation has largely restricted the application of peripheral catheters in clinical monitoring. When doctors need to understand the patient's central venous pressure in real time, they have to choose more complex and risky central venous catheterization and other methods for measurement, which undoubtedly increases the patient's medical risks and economic burden. Peripheral catheters are often used for intravenous infusion. Although they can reduce the pain of repeated punctures for patients, traditional peripheral catheters cannot be directly used for central venous pressure measurement, which limits their application in clinical monitoring.

[0004] Therefore, those skilled in the art provide an integrated central venous pressure measurement device via a peripherally inserted needle to solve the problems raised in the above-mentioned background technology. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the shortcomings of the prior art, the present invention provides an integrated central venous pressure measuring device via a peripherally inserted needle, which solves the problem that traditional peripherally inserted needles cannot be directly used for central venous pressure measurement, limiting their application in clinical monitoring.

[0007] (II) Technical solution

[0008] To achieve the above object, the present invention provides the following technical solution: a device for measuring central venous pressure through an integrated peripheral indwelling needle, comprising a hose fixedly connected to the indwelling needle input end by the indwelling needle, a connecting assembly being installed at one end of the hose away from the indwelling needle, a plug being fixedly connected to the end face of the hose away from the indwelling needle, and a tube clamp being slidably connected to the outer surface of the hose;

[0009] The connection assembly includes a connection seat fixedly connected to the outer surface of the plug, a slot is provided at the top center of the connection seat, sliding cavities are provided inside the connection seat on both sides of the slot, a sealing plate is sealingly and slidably connected to the inside of the sliding cavity, a baffle is fixedly connected to the sealing plate near the center of the surface of the connection seat, a connecting pipe connected to the inside of the sliding cavity is fixedly connected to the inside of the connection seat, a sealing cavity is provided inside the connection seat, a sealing block is sealingly and slidably connected to the inside of the sealing cavity, a fixing rod is fixedly connected to the center of the surface of the sealing block, and the surface of the sealing block away from the fixing rod A convex plate is fixedly connected, and silicone blocks are fixedly connected to both sides of the fixed rod inside the sealing cavity, a boosting cavity is opened inside the connecting seat, a sealing disk is sealingly and slidably connected to the inside of the boosting cavity, a spring is movably installed inside the boosting cavity, a first ventilation pipe connected to the inside of the boosting cavity is fixedly connected inside the connecting seat, a sealing assembly is installed at one end of the first ventilation pipe away from the boosting cavity, a square groove is opened inside the connecting seat, a measuring assembly is installed inside the square groove, a glass plate is fixedly connected inside the square groove, and an exhaust pipe is fixedly connected to the output end of the measuring assembly.

[0010] Preferably, a silicone sealing pad is fixedly connected to the surface of the baffle away from the sealing plate, and the number of the silicone sealing pads is two. The two baffles are sealed together through the silicone sealing pad, and the outer surface of the baffle is sealed and inserted into the inside of the slot.

[0011] Preferably, the interior of the sliding cavity is in a strong pressure state, and the end of the interior of the sliding cavity away from the slot is connected to the left end of the interior of the sealing cavity through a connecting pipe.

[0012] Preferably, under normal conditions, the elasticity of the silicone block causes the sealing block to slide in a direction away from the plug, and the outer surface of the fixing rod is slidably connected to the inside of the connecting seat.

[0013] Preferably, under normal conditions, the elasticity of the spring causes the sealing disk to slide toward the fixed rod, the interior of the boost chamber and the interior of the first ventilation pipe are both in a negative pressure state, the top of the outer surface of the plug is arc-shaped, and the bottom of the baffle is arc-shaped.

[0014] Preferably, the measuring assembly comprises a glass measuring tube fixedly connected to the inside of the square groove, an upper positioning block and a lower positioning block are fixedly connected to the inside of the glass measuring tube, a silicone rubber plate is sealed and slidably connected to the inside of the glass measuring tube between the upper positioning block and the lower positioning block, scale lines are arranged on the surface of the glass measuring tube, a measuring hole is provided on the side of the glass measuring tube at the top of the inner side of the glass measuring tube, and a bottom hole is provided at the bottom of the glass measuring tube;

[0015] The sealing assembly includes a transverse groove, a first limiting cavity and a second limiting cavity opened inside the connecting seat, the first limiting cavity is sealingly and slidably connected to the inside of the first movable plate, the surface of the first movable plate is fixedly connected to the first ventilation pipe connected to the inside of the connecting seat, an air discharge groove is fixedly opened inside the connecting seat, an exhaust groove connected to the bottom end of the glass measuring tube is opened inside the connecting seat, the second limiting cavity is sealingly and slidably connected to the inside of the second movable plate, and the surface of the second movable plate is fixedly connected to the second sealing plug plate.

[0016] Preferably, the outer surface of the first sealing plug plate is sealed and inserted into the interior of the transverse groove, and the surface of the second sealing plug plate extends into the interior of the exhaust groove.

[0017] Preferably, the inner top end of the second limiting cavity is connected to the interior of the second limiting cavity through a second ventilation pipe, and the second ventilation pipe is connected to the interior of the boosting cavity through the first ventilation pipe.

[0018] Preferably, the inner top of the glass measuring tube is connected to the outside of the connecting seat through an exhaust pipe, and the interior of the glass measuring tube is connected to the interior of the exhaust groove through a bottom hole, and the exhaust groove extends to the outer surface of the connecting seat away from one end of the glass measuring tube.

[0019] Preferably, the inner top end of the first limiting cavity is connected to the outside of the connecting seat through an air relief groove, and the inner right end of the second limiting cavity is connected to the outside of the connecting seat through an air relief groove.

[0020] (III) Beneficial effects

[0021] Compared with the prior art, the present invention provides an integrated central venous pressure measurement device via a peripherally inserted needle, which has the following beneficial effects:

[0022] 1. The integrated central venous pressure measuring device for peripherally indwelling needles can drive the sealing block to slide by pressing the convex plate, and make the inside of the sliding cavity negative pressure. After opening the baffle, the syringe can be easily connected to the plug. This protective structure can prevent the plug from directly contacting the outside world and causing infection. After the syringe is connected to the plug, the sealing disk can be driven to slide by quickly increasing the pressure on the convex plate, and the internal top of the first limiting cavity and the internal left end of the second limiting cavity can be pressurized at the same time, so that the saline inside the hose can enter the glass measuring tube through the transverse groove, and drive the silicone rubber plate to slide, and measure the central venous pressure result through the scale line, providing an intuitive reading method, which can more accurately reflect the central venous pressure value and provide a reliable basis for clinical diagnosis and treatment.

[0023] 2. The integrated central venous pressure measuring device via a peripherally-placed needle is provided with an exhaust groove. When the central venous pressure does not need to be measured, the inside of the glass measuring tube is connected to the outside of the connecting seat through the exhaust groove. Then, after the syringe is connected to the exhaust pipe, pressure is applied to the inside of the glass measuring tube, which can reset the sliding of the silicone rubber plate to zero, eliminate the influence of the residual factors of the previous measurement on the next measurement, ensure that each measurement starts from an accurate zero point, and improve the reliability of the measurement data. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of an integrated central venous pressure measurement device via a peripherally indwelling needle proposed by the present invention;

[0025] Figure 2 A schematic diagram of the connection structure of a hose and a connection assembly in a peripherally-inserted needle integrated central venous pressure measurement device proposed by the present invention;

[0026] Figure 3 for Figure 2 A transverse cross-sectional view of

[0027] Figure 4 A schematic diagram of the connection between a sealing plate and a baffle in a peripherally indwelling needle integrated central venous pressure measurement device proposed by the present invention;

[0028] Figure 5 for Figure 3 The enlarged view of point A in the middle;

[0029] Figure 6 A schematic diagram of the connection between the sealing block and the convex plate in the integrated central venous pressure measuring device via a peripherally indwelling needle proposed by the present invention;

[0030] Figure 7 This is a schematic diagram of the structure of a plug in a peripherally-implanted integrated central venous pressure measurement device proposed by the present invention;

[0031] Figure 8 This is a schematic diagram of the structure of a measuring component in a peripherally-implanted integrated central venous pressure measuring device proposed by the present invention;

[0032] Fig. 9 for Figure 3 Enlarged view of point B in the middle.

[0033] In the figure: 1, indwelling needle; 2, hose; 21, plug; 22, pipe clamp; 3, connecting assembly; 31, connecting seat; 32, slot; 33, sliding cavity; 34, sealing plate; 35, baffle; 351, silicone sealing pad; 36, connecting pipe; 37, sealing cavity; 38, sealing block; 39, fixing rod; 310, convex plate; 311, silicone block; 312, boosting cavity; 313, sealing disk; 314, spring; 315, first ventilation pipe; 316, sealing assembly; 3161, transverse groove; 3162, first limit cavity; 3163 , first movable plate; 3164, first sealing plug plate; 3165, second vent pipe; 3169, air release groove; 31610, exhaust groove; 31611, second limiting cavity; 31612, second movable plate; 31613, second sealing plug plate; 317, measuring assembly; 3171, glass measuring tube; 3172, upper positioning block; 3174, scale line; 3175, silicone rubber plate; 3176, lower positioning block; 3177, measuring hole; 3178, bottom hole; 318, square groove; 319, glass plate; 320, exhaust pipe. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention are described clearly and completely below. 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1-9 , an integrated central venous pressure measuring device via a peripheral indwelling needle, comprising an indwelling needle 1, a hose 2 fixedly connected to the input end of the indwelling needle 1, a connecting assembly 3 installed at one end of the hose 2 away from the indwelling needle 1, a plug 21 fixedly connected to the end face of the hose 2 away from the indwelling needle 1, and a tube clamp 22 slidably connected to the outer surface of the hose 2;

[0036] The connection assembly 3 includes a connection seat 31 fixedly connected to the outer surface of the plug 21, a slot 32 is provided at the top center of the connection seat 31, a sliding cavity 33 is provided inside the connection seat 31 on both sides of the slot 32, a sealing plate 34 is sealingly and slidably connected inside the sliding cavity 33, a baffle 35 is fixedly connected to the sealing plate 34 near the center of the surface of the connection seat 31, a connecting pipe 36 connected to the inside of the sliding cavity 33 is fixedly connected inside the connection seat 31, a sealing cavity 37 is provided inside the connection seat 31, a sealing block 38 is sealingly and slidably connected inside the sealing cavity 37, a fixing rod 39 is fixedly connected at the center of the surface of the sealing block 38, a convex plate 310 is fixedly connected to the surface of the sealing block 38 away from the fixing rod 39, a silicone block 311 is fixedly connected to both sides of the fixing rod 39 inside the sealing cavity 37, and a pressurization cavity 3 is provided inside the connection seat 31 12. The internal sealing sliding connection of the boost chamber 312 is provided with a sealing disk 313, the internal of the boost chamber 312 is movably provided with a spring 314, the internal of the connecting seat 31 is fixedly connected with a first ventilation pipe 315 which is connected with the internal of the boost chamber 312, and a sealing component 316 is installed at one end of the first ventilation pipe 315 which is away from the boost chamber 312. A square groove 318 is provided inside the connecting seat 31, and a measuring component 317 is installed inside the square groove 318. A glass plate 319 is fixedly connected inside the square groove 318, and an exhaust pipe 320 is fixedly connected to the output end of the measuring component 317. By setting the connecting component 3 and pressing the convex plate 310, the sealing block 38 can be driven to slide, and the internal of the sliding chamber 33 is negatively pressurized. After opening the baffle 35, the syringe can be easily connected to the plug 21. This protective structure can prevent the plug 21 from directly contacting the outside world and causing infection.

[0037] A silicone sealing gasket 351 is fixedly connected to the surface of the baffle 35 away from the sealing plate 34. There are two silicone sealing gaskets 351. The two baffles 35 are sealed together by the silicone sealing gaskets 351. The outer surface of the baffle 35 is sealed and inserted into the inside of the slot 32. By providing the silicone sealing gasket 351, the sealing inside the slot 32 can be strengthened after the two baffles 35 are closed.

[0038] The interior of the sliding chamber 33 is in a strong pressure state. The end of the sliding chamber 33 away from the slot 32 is connected to the left end of the sealing chamber 37 through the connecting pipe 36. Since the interior of the sliding chamber 33 is in a strong pressure state, the two baffles 35 can be pressed against each other.

[0039] Under normal conditions, the elasticity of the silicone block 311 causes the sealing block 38 to slide away from the plug 21, and the outer surface of the fixing rod 39 is slidably connected to the inside of the connecting seat 31. By setting the silicone block 311, the sliding of the sealing block 38 can be quickly reset when no external force is applied to the convex plate 310.

[0040] Under normal conditions, the elasticity of the spring 314 causes the sealing disk 313 to slide toward the fixed rod 39, the interior of the boost chamber 312 and the interior of the first ventilation pipe 315 are both in a negative pressure state, the top of the outer surface of the plug 21 is arc-shaped, and the bottom of the baffle 35 is arc-shaped. By setting the spring 314, when the sealing disk 313 is not abutted by the fixed rod 39, the sliding of the sealing disk 313 can be quickly reset.

[0041] The measuring assembly 317 includes a glass measuring tube 3171 fixedly connected to the inside of the square groove 318, an upper positioning block 3172 and a lower positioning block 3176 are fixedly connected to the inside of the glass measuring tube 3171, a silicone rubber plate 3175 is sealed and slidably connected between the upper positioning block 3172 and the lower positioning block 3176, a scale line 3174 is provided on the surface of the glass measuring tube 3171, a measuring hole 3177 is provided on the side of the glass measuring tube 3171 at the top of the inner side of the glass measuring tube 3171, and a bottom hole 3178 is provided at the bottom of the glass measuring tube 3171;

[0042] The sealing assembly 316 includes a transverse groove 3161, a first limiting cavity 3162 and a second limiting cavity 31611 provided inside the connection seat 31. The first limiting cavity 3162 is sealingly and slidably connected to the first movable plate 3163. The surface of the first movable plate 3163 is fixedly connected to the first sealing plug plate 3164. The connection seat 31 is fixedly connected to the second ventilation pipe 3165 which is connected to the first ventilation pipe 315. The connection seat 31 is fixedly provided with an air release groove 3169. The connection seat 31 is provided with an exhaust groove 31610 which is connected to the bottom end of the glass measuring tube 3171. The second limiting cavity 31611 is sealingly and slidably connected to the second movable plate 316 12. The surface of the second movable plate 31612 is fixedly connected with the second sealing plug plate 31613. By setting the sealing component 316 and the measuring component 317, the sealing plate 313 can be driven to slide by quickly increasing the pressure on the convex plate 310, and the internal top end of the first limiting cavity 3162 and the internal left end of the second limiting cavity 31611 can be pressurized at the same time, so that the saline in the hose 2 can enter the glass measuring tube 3171 through the transverse groove 3161, and drive the silicone rubber plate 3175 to slide, and measure the central venous pressure result through the scale line 3174, providing an intuitive reading method, which can more accurately reflect the central venous pressure value and provide a reliable basis for clinical diagnosis and treatment.

[0043] The outer surface of the first sealing plug plate 3164 is sealed and inserted into the interior of the transverse groove 3161, and the surface of the second sealing plug plate 31613 extends into the interior of the exhaust groove 31610. When the interior of the transverse groove 3161 is sealed, the interior of the exhaust groove 31610 is in an open state, and the pressure inside the glass measuring tube 3171 can be relieved.

[0044] The inner top of the second limiting cavity 31611 is connected to the interior of the second limiting cavity 31611 through the second ventilation pipe 3165 , and the second ventilation pipe 3165 is connected to the interior of the boosting cavity 312 through the first ventilation pipe 315 .

[0045] The inner top end of the glass measuring tube 3171 is connected to the outside of the connecting seat 31 through the exhaust pipe 320, and the interior of the glass measuring tube 3171 is connected to the interior of the exhaust groove 31610 through the bottom hole 3178. The exhaust groove 31610 extends to the outer surface of the connecting seat 31 away from one end of the glass measuring tube 3171. By setting the exhaust groove 31610, the reset sliding of the silicone rubber plate 3175 can be achieved.

[0046] The inner top of the first limiting cavity 3162 is connected to the outside of the connecting seat 31 through the air relief groove 3169, and the inner right end of the second limiting cavity 31611 is connected to the outside of the connecting seat 31 through the air relief groove 3169. By setting the air relief groove 3169, the smooth sliding of the first movable plate 3163 and the second movable plate 31612 can be guaranteed.

[0047] In summary, when the integrated central venous pressure measuring device via peripheral indwelling needle is used, the hose 2 is first clamped by the tube clamp 22, and then physiological saline is sucked into the spiral syringe, and the soft sleeve is inserted into the syringe output end, the connecting seat 31 is held and pressure is applied to the convex plate 310. At this time, the convex plate 310 drives the sealing block 38 to slide to the right, so that the left end of the sealing cavity 37 is in a negative pressure state, and the sliding cavity 33 is in a negative pressure state through the connecting tube 36. The sealing plate 34 drives the baffle 35 to slide in the direction away from the slot 32. At this time, the fixing rod 39 is not in contact with the surface of the sealing disk 313, and then the soft sleeve at the output end of the spiral syringe is sleeved. Inside the plug 21, the application of pressure to the convex plate 310 can be stopped at this time, the surface of the baffle 35 is clamped on the outer surface of the spiral syringe, and the tube clamp 22 is removed, and then saline is injected into the hose 2 through the spiral syringe. After filling, the push rod of the spiral syringe is no longer rotated, and then pressure is applied to the convex plate 310 through a large pressure. At this time, the convex plate 310 drives the fixing rod 39 to slide to the right through the sealing block 38, and drives the sealing disk 313 to slide to the right through the abutment between the fixing rod 39 and the sealing disk 313, and makes the inner top of the first limit cavity 3162 in a strong pressure state through the first ventilation pipe 315 and the second ventilation pipe 3165. The second movable plate 31612 drives the second sealing plug plate 31613 to slide rightward and seal the interior of the exhaust groove 31610. The first movable plate 3163 drives the first sealing plug plate 3164 to slide downward. At this time, the interior of the plug 21 is connected to the interior of the glass measuring tube 3171 through the transverse groove 3161 and the measuring hole 3177. The physiological saline will flow back into the transverse groove 3161 and the interior of the glass measuring tube 3171 and drive the silicone rubber plate 3175 to slide upward. When the silicone rubber plate 3175 slides to a stable position, the scale line 3174 reads Output the value and record it. After the test is completed, stop applying pressure to the convex plate 310. Through the elasticity of the spring 314, the sealing disk 313 slides to the left. At this time, the first sealing plug plate 3164 slides upward to seal the inside of the transverse groove 3161, and the second sealing plug plate 31613 slides to the left to connect the bottom end of the glass measuring tube 3171 with the external atmospheric pressure. Then, after connecting the syringe to the exhaust pipe 320, apply pressure to the inside of the glass measuring tube 3171 to reset and zero the sliding of the silicone rubber plate 3175. Finally, after sucking out the excess saline with the spiral syringe, clamp the hose 2 with the tube clamp 22.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated central venous pressure measuring device via a peripheral indwelling needle, comprising an indwelling needle (1), and a hose (2) fixedly connected to the input end of the indwelling needle (1), characterized in that: A connecting assembly (3) is installed at one end of the hose (2) away from the indwelling needle (1), a plug (21) is fixedly connected to the end surface of the hose (2) away from the indwelling needle (1), and a tube clamp (22) is slidably connected to the outer surface of the hose (2); The connection assembly (3) comprises a connection seat (31) fixedly connected to the outer surface of the plug (21), a slot (32) is provided at the top center of the connection seat (31), sliding cavities (33) are provided inside the connection seat (31) on both sides of the slot (32), a sealing plate (34) is sealingly slidably connected inside the sliding cavity (33), a baffle (35) is fixedly connected to the sealing plate (34) near the center of the surface of the connection seat (31), a connecting pipe (36) connected to the inside of the sliding cavity (33) is fixedly connected inside the connection seat (31), a sealing cavity (37) is provided inside the connection seat (31), a sealing block (38) is sealingly slidably connected inside the sealing cavity (37), a fixing rod (39) is fixedly connected to the center of the surface of the sealing block (38), and a convex plate (31) is fixedly connected to the surface of the sealing block (38) away from the fixing rod (39). 0), the interior of the sealing cavity (37) is located on both sides of the fixing rod (39) and is fixedly connected with silicone blocks (311), the interior of the connecting seat (31) is provided with a pressurizing cavity (312), the interior of the pressurizing cavity (312) is sealed and slidably connected with a sealing disk (313), the interior of the pressurizing cavity (312) is movably installed with a spring (314), the interior of the connecting seat (31) is fixedly connected with a first ventilation pipe (315) connected with the interior of the pressurizing cavity (312), the end of the first ventilation pipe (315) away from the pressurizing cavity (312) is installed with a sealing component (316), the interior of the connecting seat (31) is provided with a square groove (318), the interior of the square groove (318) is installed with a measuring component (317), the interior of the square groove (318) is fixedly connected with a glass plate (319), and the output end of the measuring component (317) is fixedly connected with an exhaust pipe (320).

2. The integrated central venous pressure measuring device via peripherally inserted needle according to claim 1, characterized in that: A silicone sealing pad (351) is fixedly connected to the surface of the baffle (35) away from the sealing plate (34), and the number of the silicone sealing pads (351) is two. The two baffles (35) are sealed together by the silicone sealing pads (351), and the outer surface of the baffle (35) is sealed and inserted into the interior of the slot (32).

3. The integrated central venous pressure measuring device via peripherally inserted needle according to claim 1, characterized in that: The interior of the sliding chamber (33) is in a strong pressure state, and the end of the interior of the sliding chamber (33) away from the slot (32) is connected to the left end of the interior of the sealing chamber (37) through a connecting pipe (36).

4. The integrated central venous pressure measuring device via peripherally inserted needle according to claim 1, characterized in that: Under normal conditions, the elasticity of the silica gel block (311) causes the sealing block (38) to slide in a direction away from the plug (21), and the outer surface of the fixing rod (39) is slidably connected to the inside of the connecting seat (31).

5. The integrated central venous pressure measuring device via peripherally inserted needle according to claim 1, characterized in that: Under normal conditions, the elasticity of the spring (314) causes the sealing disk (313) to slide toward the fixed rod (39), the interior of the boost chamber (312) and the interior of the first ventilation pipe (315) are both in a negative pressure state, the top of the outer surface of the plug (21) is arc-shaped, and the bottom of the baffle (35) is arc-shaped.

6. The integrated central venous pressure measuring device via peripherally inserted needle according to claim 1, characterized in that: The measuring assembly (317) comprises a glass measuring tube (3171) fixedly connected to the inside of the square groove (318); an upper positioning block (3172) and a lower positioning block (3176) are fixedly connected to the inside of the glass measuring tube (3171); a silicone rubber plate (3175) is sealingly and slidably connected between the upper positioning block (3172) and the lower positioning block (3176) in the inside of the glass measuring tube (3171); scale lines (3174) are provided on the surface of the glass measuring tube (3171); a measuring hole (3177) is provided on the side of the glass measuring tube (3171) at the top end of the glass measuring tube (3171); and a bottom hole (3178) is provided at the bottom of the glass measuring tube (3171); The sealing assembly (316) comprises a transverse groove (3161) provided inside the connecting seat (31), a first limiting cavity (3162) and a second limiting cavity (31611); the first limiting cavity (3162) is sealingly and slidably connected to the inside of a first movable plate (3163); the surface of the first movable plate (3163) is fixedly connected to the first sealing plug plate (3164); the inside of the connecting seat (31) is fixedly connected to the second ventilation pipe (3165) which is connected to the inside of the first ventilation pipe (315); the inside of the connecting seat (31) is fixedly provided with an air release groove (3169); the inside of the connecting seat (31) is provided with an exhaust groove (31610) which is connected to the bottom end of the glass measuring tube (3171); the inside of the second limiting cavity (31611) is sealingly and slidably connected to the second movable plate (31612); the surface of the second movable plate (31612) is fixedly connected to the second sealing plug plate (31613).

7. The integrated central venous pressure measuring device via peripherally inserted needle according to claim 6, characterized in that: The outer surface of the first sealing plug plate (3164) is sealed and inserted into the interior of the transverse groove (3161), and the surface of the second sealing plug plate (31613) extends into the interior of the exhaust groove (31610).

8. The integrated central venous pressure measuring device via peripherally inserted needle according to claim 6, characterized in that: The inner top of the second limiting cavity (31611) is connected to the interior of the second limiting cavity (31611) through the second ventilation pipe (3165), and the second ventilation pipe (3165) is connected to the interior of the boosting cavity (312) through the first ventilation pipe (315).

9. The integrated central venous pressure measuring device via peripherally inserted needle according to claim 6, characterized in that: The inner top end of the glass measuring tube (3171) is connected to the outside of the connecting seat (31) through the exhaust pipe (320), and the interior of the glass measuring tube (3171) is connected to the interior of the exhaust groove (31610) through the bottom hole (3178), and the exhaust groove (31610) extends from one end of the glass measuring tube (3171) away from the outer surface of the connecting seat (31).

10. The integrated central venous pressure measuring device via peripherally inserted needle according to claim 6, characterized in that: The inner top end of the first limiting cavity (3162) is connected to the outside of the connecting seat (31) through the air relief groove (3169), and the inner right end of the second limiting cavity (31611) is connected to the outside of the connecting seat (31) through the air relief groove (3169).

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