Liquid return device applied to invasive pressure sensor

Abstract

The utility model discloses a liquid return device applied to an invasive pressure sensor, which comprises a sleeve main body, a drawing sleeve, a liquid flow guide pipe and a flow guide piston, the drawing sleeve is arranged in the sleeve main body, the flow guide piston is connected to one end of the drawing sleeve, and a first gap is arranged between the flow guide piston and the inner wall of a flow guide end. The flow guide piston comprises a liquid outlet component and a blocking component which are connected in a matched mode, a liquid flow channel communicated with the liquid flow guide pipe is arranged in the liquid outlet component, a second gap is formed between the liquid outlet component and the blocking component, and the liquid flow channel is communicated with the second gap. According to the liquid return device, the first gap is formed between the flow guide piston and the inner wall of the flow guide end, and the second gap is formed between the liquid outlet component and the blocking component, so that liquid flows through the second gap and the first gap in sequence to wash the inner wall of the liquid return device during liquid outlet, and the problem that the inner wall of the liquid return device cannot be flushed in the prior art is effectively solved. And part of the blood / liquid mixture remains in the flushing dead angle of the liquid return device during liquid return, so that the blood / liquid mixture is difficult to clean.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a liquid return device applied to an invasive pressure sensor. Background Art

[0002] An invasive pressure sensor is an invasive arteriovenous pressure monitoring device, primarily consisting of a sampling tee, a pressure sensor, an exhaust valve, a pressure signal output connection, and connecting piping. It can continuously and dynamically monitor a person's arterial pressure, central venous pressure, pulmonary artery pressure, and left coronary artery pressure, and directly obtain pressure values, providing an objective basis for clinical disease diagnosis, treatment, and prognosis assessment, greatly meeting clinical needs. Existing invasive pressure sensors not only monitor arteriovenous pressure but also have a blood sampling function. This is achieved by installing a blood sampling device and a liquid return device on the connecting piping of the pressure sensor, reducing the number of blood vessel punctures required. The liquid return device is used to flush residual blood from the piping. In the prior art, a piston-type liquid return device is generally installed between the sampling tee and the pressure testing device. A blood sampling device is externally connected to the sampling tee. During the blood sampling process, some blood will enter the liquid return device. After the blood sampling is completed, flushing liquid is injected into the pipeline through the piston-type liquid return device to flush the remaining blood in the liquid return device and the connecting pipeline and return it to the blood vessels of the monitored person. The piston-type liquid return device in the prior art includes a piston and a liquid return cylinder. The piston is movably arranged in the internal cavity of the liquid return cylinder. During liquid return, there is a flushing dead angle between the piston and the inner wall of the liquid return cylinder, and the liquid cannot be completely discharged. Some blood / liquid mixture will still remain in the flushing dead angle, making it difficult to flush it out.

[0003] Therefore, the piston-type liquid return device in the prior art cannot completely discharge the liquid during liquid return, and some blood / liquid mixture will still remain in the flushing dead corner of the liquid return device, which is difficult to flush completely. Utility Model Content

[0004] The utility model provides a liquid return device for an invasive pressure sensor, which aims to solve the technical defects of the piston-type liquid return device in the prior art, which cannot completely discharge the liquid during liquid return, and some blood / liquid mixture will still remain in the flushing dead corner of the liquid return device, making it difficult to flush it clean.

[0005] The utility model discloses a liquid return device for an invasive pressure sensor, comprising: a sleeve body, the sleeve body is cylindrical and an accommodating cavity is provided inside the sleeve body, the sleeve body comprises a relatively arranged guide end and a covering end, the guide end is provided with a liquid return hole, and the covering end cover is provided with a first cover body; a pull-out sleeve, the pull-out sleeve is arranged in the accommodating cavity and the pull-out sleeve and the sleeve body are coaxially arranged, the pull-out sleeve comprises a relatively arranged pull-out end and an assembly end, the pull-out end passes through the first cover body and is connected to a locking device, the assembly end is equipped with a guide piston, the guide piston is arranged inside the guide end of the sleeve body, and a guide piston is provided between the guide piston and the inner wall of the guide end. There is a first gap, and the shape of the guide piston is adapted to the shape of the guide end of the sleeve body; a liquid flow conduit is arranged inside the pulling sleeve, the first end of the liquid flow conduit is connected to the guide piston, and the second end of the liquid flow conduit is connected to the liquid supply device; the guide piston includes a liquid outlet component and a blocking component that are matched and connected, the liquid outlet component is assembled with the assembly end, the first gap is set between the blocking component and the inner wall of the guide end, a liquid flow channel is provided inside the liquid outlet component, and the liquid flow channel is connected to the first end of the liquid flow conduit, a second gap is provided between the liquid outlet component and the blocking component, and the liquid flow channel, the second gap and the first gap are connected in sequence.

[0006] Specifically, the blocking component includes: a first conical end and a recessed end. The shape of the first conical end is adapted to the shape of the inner wall of the guide end. The recessed end is recessed toward the first conical end to form a groove. The recessed end is cooperatively connected with the liquid outlet component. The liquid outlet component includes: a second conical end adapted to the shape of the recessed end and a flat end. The second conical end is cooperatively connected with the recessed end. The flat end is assembled on the assembly end of the pull-out sleeve.

[0007] Among them, a clamping part is convexly provided on the flat end, a clamping hook is provided at the end of the clamping part, and a clamping hole is provided on the side wall of the assembly end of the pull-out sleeve, and the clamping hook is clamped in the clamping hole.

[0008] The lock member is a pair of locks, each of which is connected to the other end of the lock member, and the lock member is connected to the other end of the lock member by a threaded connection, and the lock member is connected to the other end of the lock member by a threaded connection.

[0009] Specifically, the outer wall of the liquid outlet component is concave inwardly along the circumferential direction to form a mounting groove, a sealing ring is provided in the mounting groove and the sealing ring is in contact with the inner wall of the sleeve body.

[0010] Preferably, reinforcing ribs are further provided at the connections between the first clamping plate, the connecting plate and the second clamping plate.

[0011] Specifically, the liquid return device further includes a connecting pipe, which is connected to the flow guide end of the sleeve body and communicates with the liquid return hole.

[0012] The flow-guiding end of the sleeve body includes an arc-shaped bottom surface, which is adapted to the shape of the first conical end, and the liquid return hole is arranged at the center of the arc-shaped bottom surface.

[0013] Among them, a flexible sheath is also provided between the sleeve body and the pull-out sleeve, the flexible sheath is sleeved on the outside of the pull-out sleeve, and the first end of the flexible sheath is connected to the covering end of the sleeve body; the outer wall of the middle section of the pull-out sleeve is provided with a snap-fitting protrusion, the second end of the flexible sheath is sleeved on the outside of the snap-fitting protrusion, and the second end of the flexible sheath is provided with a second opening, and the size of the second opening is smaller than the size of the snap-fitting protrusion.

[0014] Preferably, the flexible sheath is a flexible silicone membrane sheath, and the thickness of the flexible sheath is 0.5-1 mm.

[0015] The utility model discloses a liquid return device for an invasive pressure sensor, comprising a sleeve body, a pulling sleeve, a liquid flow conduit, and a guide piston. The sleeve body is provided with an accommodating chamber, the pulling sleeve is arranged in the accommodating chamber and the pulling sleeve is coaxially arranged with the sleeve body, the guide piston is arranged inside the guide end of the sleeve body, a first gap is provided between the guide piston and the inner wall of the guide end, the assembly end of the pulling sleeve is connected to the guide piston, the liquid flow conduit is passed through the interior of the pulling sleeve, the first end of the liquid flow conduit is communicated with the guide piston, and the second end of the liquid flow conduit is connected to the liquid supply device; the guide piston comprises a liquid discharge component and a blocking component that are matched and connected, the liquid discharge component is assembled with the assembly end, the first gap is provided between the blocking component and the inner wall of the guide end, a liquid flow channel is provided inside the liquid discharge component, and the liquid flow channel is communicated with the first end of the liquid flow conduit, a second gap is provided between the liquid discharge component and the blocking component, and the liquid flow channel, the second gap, and the first gap are connected in sequence. In the utility model, a first gap is provided between the guide piston and the inner wall of the guide end, and a second gap is provided between the liquid outlet component and the blocking component. Liquid flows into the second gap through the liquid flow conduit and the liquid flow channel, and then into the first gap, thereby flushing the blood / liquid mixture remaining on the inner wall of the guide end. The flushing liquid flows out through the liquid return hole, effectively solving the technical problem in the prior art that, during liquid return, there is a flushing dead angle between the piston and the inner wall of the liquid return cylinder, the liquid cannot be completely discharged, and some blood / liquid mixture still remains in the flushing dead angle, making it difficult to flush it clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without making any innovative efforts.

[0017] Figure 1 This is an overall structural diagram of the liquid return device disclosed in an embodiment of the present utility model;

[0018] Figure 2 This is a front view of the liquid return device disclosed in an embodiment of the present utility model;

[0019] Figure 3 This is a cross-sectional view of the liquid return device disclosed in an embodiment of the present utility model in the first position;

[0020] Figure 4 This is a cross-sectional view of the liquid return device disclosed in an embodiment of the present utility model in the second position;

[0021] Figure 5 The disclosed embodiment of the utility model Figure 3 A magnified view of the structure of part B;

[0022] Figure 6 The disclosed embodiment of the utility model Figure 1 A magnified view of the structure of part A;

[0023] Figure 7 The disclosed embodiment of the utility model Figure 3 A magnified view of the structure of part C;

[0024] Reference numerals:

[0025] 1. Sleeve body; 10. Accommodating chamber; 11. Diversion end; 111. Liquid return hole; 12. Cover end; 121. First groove; 122. First boss; 13. Connecting pipe; 131. First ear seat; 132. Second ear seat; 1321. Second opening; 15. First cover; 151. Cover ring; 152. Cover plate; 2. Pull-out sleeve; 21. Assembly end; 211. Snap-fit hole; 22. Pull-out end; 23. Snap-fit convex ring; 3. Locking device; 31. Connecting plate; 311. First through hole; 32. First clamping plate; 321. First snap-fit portion; 3211. First snap-fit protrusion ; 3212, second clamping protrusion; 3213, clamping groove; 33, second clamping plate; 331, second clamping portion; 34, anti-slip protrusion; 35, mounting ring; 36, reinforcing rib; 100, first gap; 200, first cavity; 4, flow guide piston; 41, liquid outlet component; 411, second tapered end; 412, flat end; 4121, clamping portion; 42, blocking component; 421, first tapered end; 422, recessed end; 43, second gap; 431, liquid flow channel; 5, liquid flow conduit; 6, sealing ring; 7, flexible sheath; 71, clamping ring; 711, clamping protrusion; DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying 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 embodiments described are 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 making creative efforts are within the scope of protection of the present invention.

[0027] It will be understood that when used in this specification and the appended claims, the terms "comprises" and "comprising" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0028] It should also be understood that the terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in this specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0029] It should be further understood that the terms “and” and “or” used in the present specification and the appended claims refer to any and all possible combinations of one or more of the associated listed items, and include these combinations.

[0030] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

[0031] The utility model discloses a liquid return device for an invasive pressure sensor, such as Figure 1-4 As shown, it includes: a sleeve body 1, the sleeve body 1 is cylindrical and an accommodating chamber 10 is provided inside the sleeve body 1, the sleeve body 1 includes a relatively arranged guide end 11 and a covering end 12, the guide end 11 is provided with a return liquid hole 111, and the covering end 12 is covered with a first cover body 15, and the first cover body 15 is fixedly connected to the sleeve body 1; a pulling sleeve 2, the pulling sleeve 2 is arranged in the accommodating chamber 10 and the pulling sleeve 2 is coaxially arranged with the sleeve body 1, the pulling sleeve 2 includes a relatively arranged pulling end 22 and an assembly end 21, the pulling end 22 passes through the first cover body 15 and is connected to the locking device 3, and the locking device 3 is used to lock or release the pulling sleeve 2 so that the pulling sleeve 2 is in the first position (such as Figure 3 ) or the second position (as shown Figure 4 As shown), the assembly end 21 is equipped with a guide piston 4, which applies a force to the pulling sleeve 2, so that the pulling sleeve 2 moves and drives the guide piston 4 to slide along the sleeve body 1, and a first cavity 200 with variable capacity is formed between the guide piston 4 and the inner wall of the sleeve body 1. The guide piston 4 is arranged inside the guide end 11 of the sleeve body 1, and the shape of the guide piston 4 is adapted to the shape of the guide end 11 of the sleeve body 1; when the pulling sleeve 2 is in the first position, a first gap 100 is provided between the guide piston 4 and the inner wall of the guide end 11; a liquid flow conduit 5, which is arranged inside the pulling sleeve 2, a first end of the liquid flow conduit 5 is connected to the guide piston 4, and a second end of the liquid flow conduit 5 is connected to a liquid supply device (not shown in the figure).

[0032] The guide piston 4 includes a liquid outlet component 41 and a blocking component 42 that are connected in a matching manner. The liquid outlet component 41 is assembled with the assembly end 21. The first gap 100 is set between the blocking component 42 and the inner wall of the guide end 11. The interior of the liquid outlet component 41 is provided with a liquid flow channel 431. For details, please refer to Figure 5The liquid flow channel 431 is set through the liquid outlet component 41 and is connected to the first end of the liquid flow conduit 5. A second gap 43 is provided between the liquid outlet component 41 and the blocking component 42. The liquid flow channel 431, the second gap 43, and the first gap 100 are connected in sequence. During specific implementation, under the action of liquid pressure, the liquid flows through the liquid flow conduit 5 and the liquid flow channel 431 into the second gap 43 and into the first gap 100, flushing the blood / liquid mixture remaining on the inner wall of the guide end 11, and the flushing liquid flows out through the return hole 111.

[0033] When the pull-out sleeve 2 is in the first position, there is no liquid in the first cavity 200, the locking device 3 locks the pull-out sleeve 2, and the guide piston 4 is placed inside the guide end 11 of the sleeve body 1; when the pull-out sleeve 2 is in the second position, the locking device 3 leaves the sleeve body 1, there is liquid in the first cavity 200, and the guide piston 4 is away from the guide end 11.

[0034] The blocking component 42 includes: a first conical end 421 and a recessed end 422. The shape of the first conical end 421 is adapted to the shape of the guide end 11. The recessed end 422 is recessed toward the first conical end 421 to form a bowl-shaped groove. The recessed end 422 is cooperatively connected with the liquid outlet component 41. The liquid outlet component 41 includes: a second conical end 411 and a flat end 412 adapted to the shape of the recessed end 422. The second conical end 411 is cooperatively connected with the recessed end 422. Specifically, a connecting protrusion is convexly provided on the surface of the second conical end 411, and a connecting hole is concavely provided on the surface of the recessed end 422. The position of the connecting protrusion corresponds to the connecting hole, and the connecting protrusion is embedded in the connecting hole to realize the assembly of the second conical end 411 and the recessed end 422.

[0035] The flat end 412 is assembled on the assembly end 21 of the pull-out sleeve 2. Specifically, the flat end 412 is provided with a convex engaging portion 4121, and the end of the engaging portion 4121 is provided with a hook. The side wall of the assembly end 21 of the pull-out sleeve 2 is provided with a snap hole 211, and the hook is engaged in the snap hole 211 to realize the assembly of the guide piston 4 and the pull-out sleeve 2.

[0036] The first and second clamping plates 32 and 33 are symmetrically arranged on both sides of the sleeve body 1. In this embodiment, the first clamping plate 32 and the second clamping plate 33 are symmetrically arranged on both sides of the sleeve body 1. In this embodiment, the first clamping plate 32 and the second clamping plate 33 are symmetrically arranged on both sides of the sleeve body 1. In this embodiment, the first clamping plate 32 and the second clamping plate 33 are symmetrically arranged on both sides of the sleeve body 1. In this embodiment, the first clamping plate 32 and the second clamping plate 33 are symmetrically arranged on both sides of the sleeve body 1. In this embodiment, the first clamping plate 32 and the second clamping plate 33 are symmetrically arranged on The holding plate 32 and the second clamping plate 33 are arranged parallel to the sleeve body 1, and a first clamping portion 321 is protruded from the outer side of the end of the first clamping plate 32 away from the connecting plate 31, and a second clamping portion 331 is protruded from the outer side of the end of the second clamping plate 33 away from the connecting plate 31. A first ear seat 131 and a second ear seat 132 are protruded from the outer wall of the sleeve body 1. When the pulling sleeve 2 is in the first position, the positions of the first ear seat 131 and the second ear seat 132 correspond to the positions of the first clamping portion 321 and the second clamping portion 331 respectively. The first ear seat 131 and the second ear seat 132 are symmetrically arranged, and a first opening is provided on the first ear seat 131, and a second opening 1321 is provided on the second ear seat 132. The first clamping portion 321 is clamped in the first opening, and the second clamping portion 331 is clamped in the second opening 1321. At this time, the pulling sleeve 2 is in the first position, and the locking device 3 locks the pulling sleeve 2.

[0037] Specifically, such as Figure 6 When the cam 32 is in the closed position, the second latch 321 is engaged with the first latch 321 and the second latch 321 is engaged with the first latch 321. When the cam 32 is in the open position, the second latch 321 is engaged with the first latch 321 and the second latch 321 is engaged with the first latch 321. When the cam 32 is in the open position, the second latch 321 is engaged with the first latch 321 and the second latch 321 is engaged with the first latch 321.

[0038] Please refer to Figure 5The outer wall of the liquid outlet component 41 is concave inward along the circumferential direction to form a mounting groove, and a sealing ring 6 is provided in the mounting groove. The sealing ring 6 is fitted to the inner wall of the sleeve body 1. Specifically, the mounting groove is arranged next to the second gap 43, so that when the liquid flows out of the second gap 43, it can flow from the sealing ring along the inner wall of the guide end 11 to the direction of the return liquid hole 111. The outer circumferential surface of the sealing ring 6 is slightly convex on the outer wall of the liquid outlet component 41. When the guide piston 4 slides along the inner wall of the sleeve body 1, the sealing ring 6 can fit the inner wall of the sleeve body 1 to achieve the function of sealing and blocking the liquid.

[0039] Among them, the connection between the first clamping plate 32, the connecting plate 31, and the second clamping plate 33 is also provided with a reinforcing rib 36. During use, the user pinches the first clamping plate 32 and the second clamping plate 33 to make the first clamping portion 321 and the second clamping portion 331 respectively disengage from the first opening and the second opening 1321. The first clamping plate 32 and the second clamping plate 33 are subjected to a pinching force toward the sleeve body 1. When pinched multiple times, the connection between the first clamping plate 32, the connecting plate 31, and the second clamping plate 33 is easy to break. The provision of the reinforcing rib 36 can prevent the connection between the first clamping plate 32, the connecting plate 31, and the second clamping plate 33 from breaking. The first clamping plate 32 and the second clamping plate 33 are also provided with an anti-slip protrusion 34 on the side away from the sleeve body 1 to prevent slipping.

[0040] Specifically, the liquid return device also includes a connecting tube 13, which is connected to the guide end 11 of the sleeve body 1 and is connected to the liquid return hole 111. The connecting tube 13 is used to connect the connecting pipeline of the invasive pressure sensor. When the blood collection is completed, the flushing liquid flows through the liquid return hole 111, the connecting tube 13, and the connecting pipeline of the invasive pressure sensor in sequence and returns to the patient's blood vessel.

[0041] The guide end 11 of the sleeve body 1 includes an arc-shaped bottom surface, which is adapted to the shape of the first tapered end 421 , and the liquid return hole 111 is provided at the center of the arc-shaped bottom surface.

[0042] A flexible sheath 7 is further provided between the sleeve body 1 and the pull-out sleeve 2. The flexible sheath 7 is sleeved on the outside of the pull-out sleeve 2. The first end of the flexible sheath 7 is connected to the cover end 12 of the sleeve body 1 to prevent dust from entering the interior of the pull-out sleeve 2 from the cover end 12. Specifically, Figure 7As shown, the first end of the flexible sheath 7 is provided with a clamping ring 71, and the end of the clamping ring 71 is provided with a clamping protrusion 711 on the side facing the covering end 12, and the covering end 12 is provided with a first groove 121, and the clamping protrusion 711 is clamped in the first groove 121. The first cover body 15 includes a connected cover plate 152 and a cover ring 151. The cover plate 152 covers the outer side of the clamping ring 71 to compress the clamping ring 71. The outer wall of the covering end 12 of the sleeve body 1 is provided with a first boss 122 along the circumferential direction, and the end of the cover ring 151 away from the cover plate 152 abuts against the first boss 122 and is fixedly connected to the first boss 122; the outer wall of the middle section of the pulling sleeve 2 is provided with a clamping protrusion 23, and the second end of the flexible sheath 7 The second end of the flexible sheath 7 is provided with a second opening, the size of the second opening is smaller than the size of the clamping convex ring 23 and the second opening is against the clamping convex ring. The flexible sheath 7 is ductile. When the drawing sleeve 2 is pulled, the flexible sheath 7 is subjected to tension, and the second end of the flexible sheath 7 is fitted to the outer side of the clamping convex ring 23. Since the size of the second opening is smaller than the size of the clamping convex ring 23, the second end of the flexible sheath 7 can be prevented from being separated from the clamping convex ring 23. The flexible sheath 7 is expanded or retracted with the movement of the drawing sleeve 2. When the drawing sleeve 2 is in the first position, the guide piston 4 is placed at the guide end of the sleeve body 1, and the flexible sheath 7 is in the expanded state. Figure 3 When the pulling sleeve 2 is in the second position, the guide piston 4 is away from the guide end 11, the flexible sheath 7 is compressed, as shown Figure 4 shown.

[0043] The flexible sheath 7 is a flexible silicone membrane sheath with a thickness of 0.5~1mm. The flexible silicone membrane sheath is relatively soft, which facilitates the flexible sheath to expand or retract with the movement of the pulling sleeve. The thickness of the flexible sheath should not be too thick or too thin. If it is too thick, the flexible sheath is difficult to deform, and if it is too thin, it is easy to be damaged. In this embodiment, the thickness of the flexible sheath is 0.7mm.

[0044] In a specific embodiment, the liquid return device is connected to the connecting pipeline of the invasive pressure sensor through the connecting pipe 13. Specifically, the liquid return device is arranged between the sampling tee and the pressure sensor. The sampling tee includes a first interface, a second interface, and a blood sampling interface that are interconnected. The first interface, the second interface, and the blood sampling interface are connected to the patient end, the liquid return device, and the blood sampling device respectively. In the initial state, the first interface, the second interface, and the blood sampling interface are all in a closed state, and the pull-out sleeve is in the first position (such as Figure 3As shown), the first clamping plate 32 and the second clamping plate 33 are respectively clamped in the first ear seat 131 and the second ear seat 132, and the pull-out sleeve is locked; when drawing blood, the first interface and the second interface are opened, and the user pinches the first clamping plate 32 and the second clamping plate 33 in the direction of the sleeve body, so that the first clamping plate 32 and the second clamping plate 33 are respectively disengaged from the first ear seat 131 and the second ear seat 132, and pulls the pull-out sleeve 2, and the guide piston 4 slides along the inner wall of the sleeve body 1 toward the covering end 12 of the sleeve body 1. At this time, the pull-out sleeve is in the second position (as shown). Figure 4 As shown), when the blood fills the connecting pipeline of the invasive pressure sensor, part of the blood enters the interior of the sleeve body 1, the second interface is closed, the liquid return device and the connecting pipeline are blocked, the first interface and the blood collection interface are opened, and the blood collection device is connected to the blood collection interface. The blood collection device is connected to the patient end to carry out blood collection. After the blood collection is completed, the blood collection interface is closed, and the first interface and the second interface are opened. Since part of the blood still remains on the inner wall of the sleeve body 1, the liquid supply device supplies liquid to the liquid flow conduit 5. The flushing liquid flows into the liquid outlet component 41 through the liquid flow conduit 5, flows into the second gap 43 through the liquid flow channel 431, and flows into the first gap 100. The blood / liquid mixture remaining on the inner wall of the guide end 11 is flushed along the inner wall of the guide end 11. The flushing liquid flows out through the liquid return hole 111 and flows back into the patient's body through the first interface of the sampling tee.

[0045] The utility model discloses a liquid return device for an invasive pressure sensor, comprising a sleeve body, a pulling sleeve, a liquid flow conduit, and a guide piston. The sleeve body is provided with an accommodating chamber, the pulling sleeve is arranged in the accommodating chamber and the pulling sleeve is coaxially arranged with the sleeve body, the guide piston is arranged inside the guide end of the sleeve body, a first gap is provided between the guide piston and the inner wall of the guide end, the assembly end of the pulling sleeve is connected to the guide piston, the liquid flow conduit is passed through the interior of the pulling sleeve, the first end of the liquid flow conduit is communicated with the guide piston, and the second end of the liquid flow conduit is connected to the liquid supply device; the guide piston comprises a liquid discharge component and a blocking component that are matched and connected, the liquid discharge component is assembled with the assembly end, the first gap is provided between the blocking component and the inner wall of the guide end, a liquid flow channel is provided inside the liquid discharge component, and the liquid flow channel is communicated with the first end of the liquid flow conduit, a second gap is provided between the liquid discharge component and the blocking component, and the liquid flow channel, the second gap, and the first gap are connected in sequence. In the utility model, a first gap is provided between the guide piston and the inner wall of the guide end, and a second gap is provided between the liquid outlet component and the blocking component. Liquid flows into the second gap through the liquid flow channel and then into the first gap, thereby flushing the blood / liquid mixture remaining on the inner wall of the guide end. The flushing liquid flows out through the liquid return hole, effectively solving the technical problems in the prior art of having flushing dead corners during liquid return, being unable to completely discharge the liquid, and having some blood / liquid mixture remaining in the flushing dead corners of the liquid return device, making it difficult to flush cleanly.

[0046] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art who can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A liquid return device for an invasive pressure sensor, characterized in that: include: The sleeve body is cylindrical and has an accommodating cavity inside. The sleeve body includes a guide end and a covering end that are oppositely arranged. The guide end is provided with a liquid return hole, and the covering end cover is provided with a first cover body. A pull-out sleeve, which is arranged in the accommodating cavity and is coaxially arranged with the sleeve body, comprises a pull-out end and an assembly end arranged opposite to each other, the pull-out end passes through the first cover body and is connected to the locking device, and the assembly end is equipped with a guide piston, which is arranged inside the guide end of the sleeve body and a first gap is provided between the guide piston and the inner wall of the guide end, and the shape of the guide piston is adapted to the shape of the guide end of the sleeve body; A liquid flow conduit is provided inside the drawing sleeve, a first end of the liquid flow conduit is connected to the guide piston, and a second end of the liquid flow conduit is connected to the liquid supply device; The guide piston includes a liquid outlet component and a blocking component that are matched and connected. The liquid outlet component is assembled with the assembly end. The first gap is set between the blocking component and the inner wall of the guide end. A liquid flow channel is provided inside the liquid outlet component, and the liquid flow channel is connected to the first end of the liquid flow conduit. A second gap is provided between the liquid outlet component and the blocking component. The liquid flow channel, the second gap, and the first gap are connected in sequence.

2. A liquid return device for an invasive pressure sensor according to claim 1, characterized in that: The blocking component includes: a first conical end and a recessed end. The shape of the first conical end is adapted to the shape of the inner wall of the guide end. The recessed end is recessed toward the first conical end to form a groove. The recessed end is cooperatively connected with the liquid outlet component. The liquid outlet component includes: a second conical end adapted to the shape of the recessed end and a flat end. The second conical end is cooperatively connected with the recessed end. The flat end is assembled on the assembly end of the pulling sleeve.

3. The liquid return device for an invasive pressure sensor according to claim 2, characterized in that: A clamping portion is convexly provided on the plane end, a clamping hook is provided at the end of the clamping portion, a clamping hole is provided on the side wall of the assembly end of the pull-out sleeve, and the clamping hook is clamped in the clamping hole.

4. The liquid return device for an invasive pressure sensor according to claim 1, characterized in that: The locking device includes a connecting plate, a mounting ring, a first clamping plate, and a second clamping plate, the connecting plate being provided with a first through hole, one end of the mounting ring being connected to the edge of the first through hole, the pulling end of the pulling sleeve being passed through the first through hole and being connected in cooperation with the mounting ring, and the mounting ring being sleeved on the outer side of the pulling end; the first clamping plate and the second clamping plate are respectively bent and connected to the two ends of the connecting plate, and the first clamping plate and the second clamping plate are symmetrically arranged on both sides of the sleeve body, the outer side of the end of the first clamping plate away from the connecting plate is protruded with a first clamping portion, the outer side of the end of the second clamping plate away from the connecting plate is protruded with a second clamping portion, the outer wall of the sleeve body is protruded with a first ear seat and a second ear seat, the first ear seat and the second ear seat are symmetrically arranged, the first ear seat is provided with a first opening, the second ear seat is provided with a second opening, the first clamping portion is clamped in the first opening or disengaged from the first opening, and the second clamping portion is clamped in the second opening or disengaged from the second opening.

5. The liquid return device for an invasive pressure sensor according to claim 1, characterized in that: The outer wall of the liquid outlet component is concave inwardly along the circumferential direction to form a mounting groove, a sealing ring is provided in the mounting groove and the sealing ring is fitted to the inner wall of the sleeve body.

6. The liquid return device for an invasive pressure sensor according to claim 4, characterized in that: Reinforcing ribs are also provided at the connections between the first clamping plate, the connecting plate and the second clamping plate.

7. The liquid return device for an invasive pressure sensor according to claim 1, characterized in that: It also includes a connecting pipe, which is connected to the flow guide end of the sleeve body and communicates with the liquid return hole.

8. The liquid return device for an invasive pressure sensor according to claim 2, characterized in that: The flow-guiding end of the sleeve body comprises an arc-shaped bottom surface, the arc-shaped bottom surface is adapted to the shape of the first conical end, and the liquid return hole is arranged at the center position of the arc-shaped bottom surface.

9. The liquid return device for an invasive pressure sensor according to claim 8, characterized in that: A flexible sheath is also provided between the sleeve body and the pull-out sleeve. The flexible sheath is sleeved on the outside of the pull-out sleeve, and the first end of the flexible sheath is connected to the covering end of the sleeve body; the outer wall of the middle section of the pull-out sleeve is provided with a snap-fitting protrusion, and the second end of the flexible sheath is sleeved on the outside of the snap-fitting protrusion. The second end of the flexible sheath is provided with a second opening, and the size of the second opening is smaller than the size of the snap-fitting protrusion.

10. The liquid return device for an invasive pressure sensor according to claim 9, characterized in that: The flexible sheath is a flexible silicone membrane sheath with a thickness of 0.5-1 mm.

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