Pressure monitor and blood purification equipment

Abstract

The utility model belongs to the technical field of medical instruments, and discloses a pressure monitor and blood purification equipment. The blood purification equipment comprises an equipment body and a pressure monitor, wherein the pressure monitor is arranged on the equipment body. The pressure monitor comprises a pressure sensor and a pressure bag, a pressure sensing piece is arranged at the top of the pressure sensor, the pressure bag comprises a base body, a connecting cylinder piece and a pressure conduction piece, the connecting cylinder piece is rotationally arranged on the base body and is in threaded connection with the pressure sensor, and the pressure conduction piece is arranged at the bottom of the base body and used for making contact with the pressure sensing piece. The connecting cylinder piece and the pressure sensor are locked through the threads, so that the pressure conducting piece can abut against the pressure sensing piece to conduct the pressure of fluid in the pressure bag. The rotatable connecting cylinder piece is arranged on the base body, the connecting cylinder piece is screwed to enable the connecting cylinder piece to be in threaded connection with the pressure sensor, operation is easy, matching is smooth, and connection is stable; the appearance is simple and smooth, and cleaning and disinfection dead angles are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a pressure monitor and blood purification equipment. Background Art

[0002] Blood purification therapy refers to drawing blood out of the body and removing harmful substances from the blood through a purification device, thereby achieving the purpose of treating the disease. For example, in the treatment of acute and chronic renal failure, the purification device is usually a dialyzer composed of 8,000 to 15,000 hollow fibers. Blood and dialysate exchange substances inside and outside the hollow fibers through physical effects such as diffusion, convection, ultrafiltration, and adsorption, removing metabolic waste from the blood to maintain electrolyte and acid-base balance, while removing excess water from the body, and finally returning the purified blood. In blood purification therapy, a pressure sensor and a pressure bag need to be set up to isolate blood and gas to achieve pressure monitoring, and can effectively prevent cross infection.

[0003] There are four forms of existing pressure sensors and pressure capsules. First, after the pressure sensor and the pressure capsule are matched, a fixed pressure head is set on the blood purification device to manually press the pressure sensor and the pressure capsule; second, a pressure sensor and a fixed hook are set on the blood purification device, and the pressure capsule is fixed by the fixed hook; third, the pressure capsule is fixed by the edge engagement of the pressure sensor; fourth, the blood purification device is provided with a pressure sensor, and the pressure sensor is provided with a mounting groove, the pressure capsule is placed in the mounting groove, and the blood purification device automatically presses and fixes the pressure capsule. The first type requires an additional fixed pressure head, and the second type has the fixed hook exposed to the outside. These two types have complex appearance structures and are not easy to clean and disinfect; the third and fourth types are inconvenient to engage, and are prone to being stuck or unable to engage smoothly.

[0004] That is, the existing pressure sensor and pressure bag have the disadvantages of complex structure, unsophisticated appearance, dead corners for cleaning and disinfection, loose connection and difficulty in smooth engagement. Utility Model Content

[0005] The utility model aims to provide a pressure monitor and a blood purification device to solve the problems of the existing pressure sensor and pressure bag cooperation, such as complex structure, unsophisticated appearance, dead angles in cleaning and disinfection, loose connection and difficulty in smooth engagement.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a pressure monitor, which comprises:

[0008] A pressure sensor, wherein a pressure sensing element is provided on the top of the pressure sensor;

[0009] The pressure bag comprises a base, a connecting cylinder and a pressure transmission component, wherein the connecting cylinder is rotatably arranged on the base and is threadedly connected to the pressure sensor; the pressure transmission component is arranged at the bottom of the base and is used to contact the pressure sensing component; after the pressure transmission component contacts the pressure sensing component, the connecting cylinder and the pressure sensor are threadedly locked, so that the pressure transmission component can be pressed against the pressure sensing component to transmit the pressure of the fluid in the pressure bag.

[0010] As an optional technical solution for a pressure monitor, the pressure sensor is provided with an external thread structure, the inner wall of the connecting cylinder is provided with an internal thread, the pressure sensor portion extends into the interior of the connecting cylinder and cooperates with the connecting cylinder thread through the external thread structure.

[0011] As an optional technical solution for a pressure monitor, the external thread structure includes at least three sections of discontinuous external threads with the same rotation direction.

[0012] As an optional technical solution for a pressure monitor, the pressure transmission component is a diaphragm, a measuring cavity is provided in the base body for the fluid to pass through, and the diaphragm is connected to the base body and closes the measuring cavity.

[0013] As an optional technical solution for a pressure monitor, a slot structure is provided at the bottom of the base, a convex structure is provided at the edge of the diaphragm, and the slot structure is fixed to the convex structure by hot pressing and bending.

[0014] As an optional technical solution for a pressure monitor, the pressure sensing element is a diaphragm, and the diaphragm is arranged on the top surface of the pressure sensor; the diaphragm can fit tightly with the diaphragm to transmit the pressure to the diaphragm.

[0015] As an optional technical solution for a pressure monitor, the measuring cavity is an arc-shaped cavity, and the middle space of the arc-shaped cavity is smaller than the surrounding space.

[0016] As an optional technical solution of a pressure monitor, the substrate further includes a flow channel, and the flow channel includes:

[0017] A liquid inlet channel, connected to the measuring cavity to allow the fluid to enter;

[0018] A liquid outlet channel is connected to the measuring cavity to allow the fluid to flow out.

[0019] As an optional technical solution of a pressure monitor, a gap is left between the connecting cylinder and the base in the radial direction, and the connecting cylinder can rotate independently relative to the base.

[0020] The utility model provides a blood purification device, which comprises a device body and a pressure monitor, wherein the pressure monitor is arranged on the device body.

[0021] Beneficial effects:

[0022] The utility model provides a pressure monitor, which includes a pressure sensor and a pressure capsule. A pressure sensing part is provided on the top of the pressure sensor. The pressure capsule includes a base, a connecting cylinder and a pressure transmission part. The connecting cylinder is rotatably arranged on the base. The connecting cylinder is threadedly connected to the pressure sensor. The pressure transmission part is arranged at the bottom of the base and is used to contact the pressure sensing part. After the pressure transmission part contacts the pressure sensing part, the connecting cylinder and the pressure sensor are locked by thread, so that the pressure transmission part can be pressed against the pressure sensing part to transmit the pressure of the fluid in the pressure capsule. By arranging a rotatable connecting cylinder on the base and screwing the connecting cylinder to make the connecting cylinder and the pressure sensor threadedly connected, the operation is simple, the cooperation is smooth and the connection is stable; there is no need to set an additional fixed pressure head, the appearance is simple and smooth, and it is easy to clean and disinfect.

[0023] The utility model provides a blood purification device, which includes a device body and the above-mentioned pressure monitor. The pressure monitor is arranged on the device body. By arranging a pressure bag and a pressure sensor with threaded matching, the stability of the connection is improved, the appearance is smooth, and the formation of dead corners for cleaning and disinfection is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The structure diagram of the pressure monitor provided by the embodiment of the utility model is Figure 1 ;

[0025] Figure 2 The structure diagram of the pressure monitor provided by the embodiment of the utility model is Figure 2 ;

[0026] Figure 3 The structure diagram of the pressure monitor provided by the embodiment of the utility model is Figure 3 ;

[0027] Figure 4 is a disassembled diagram of a pressure monitor provided by an embodiment of the utility model;

[0028] Figure 5 It is a cross-sectional view of a pressure monitor provided by an embodiment of the utility model.

[0029] In the figure:

[0030] 10. Pressure sensor; 11. External thread structure; 12. Fixing hole;

[0031] 20. Pressure bladder;

[0032] 21. substrate; 211. flow channel; 212. measuring cavity;

[0033] 22. Connecting cylinder;

[0034] 23. Diaphragm. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0039] like Figure 1 and Figure 4 As shown, the utility model provides a blood purification device, which includes a device body and a pressure monitor, and the pressure monitor is arranged on the device body.

[0040] The pressure monitor includes a pressure sensor 10 and a pressure capsule 20. A pressure sensing element is provided on the top of the pressure sensor 10. An external thread structure 11 is provided on the pressure sensor 10 for threaded cooperation with the pressure capsule 20. The external thread structure 11 includes at least three sections of discontinuous external threads with the same rotation direction. By setting the pressure sensor 10 and the pressure capsule 20 to be connected by threads, the structure is simple and tightly cooperated, which provides convenience for disinfection and cleaning. By setting discontinuous external threads, it is easy to process and manufacture, and has better bearing capacity and stability, so that the connection between the pressure sensor 10 and the pressure capsule 20 can be effectively prevented from loosening. When screwing, it can be locked by turning about one-third or one-quarter of a turn, which is convenient for operation, time-saving and labor-saving, and reduces the possibility of deviation or accidental jamming. Once it is deviated, it will be difficult to continue tightening, reducing the uncertainty of human operation, thereby ensuring that the pressure sensor 10 and the pressure capsule 20 can be smoothly matched in place.

[0041] In other embodiments, an internal thread may be provided on the pressure sensor 10 , and an external thread structure 11 may be provided on the pressure bag 20 .

[0042] The pressure sensing component is a diaphragm, which is located on the top surface of the pressure sensor 10. When the pressure sensor 10 and the pressure capsule 20 are assembled, the diaphragm is arranged on the top surface after the pressure sensor 10 and the pressure capsule 20 are matched, and the diaphragm can fit tightly with the pressure capsule 20, and the pressure capsule 20 can sense pressure and transmit the sensed pressure to the diaphragm; the diaphragm is the main position of the pressure sensor 10 to sense pressure.

[0043] The pressure sensor 10 is also provided with a fixing hole 12 for fixing the pressure sensor 10 on the equipment body of the monitor. A plurality of fixing holes 12 are arranged at intervals around the circumference of the pressure sensor 10 .

[0044] In this embodiment, the pressure sensor 10 includes a main body and a fixing part, the external thread structure 11 and the diaphragm are both arranged on the main body, the outer contour of the main body is circular, the fixing part is integrated with the main body and the fixing part protrudes radially from the main body; the fixing part is annular, and three fixing holes 12 are provided on the fixing part, and the three fixing holes 12 are evenly spaced around the circumference of the main body; the fixing holes 12 are fixing screw holes, and the pressure sensor 10 is fixed to the equipment body of the monitor by screws.

[0045] Preferably, the fixing part is also provided with a positioning surface, which is used to cooperate with the device body; the positioning surface is a plane and is arranged on the peripheral side of the fixing part. During installation, by fitting the positioning surface to the corresponding position of the device body, the installation position of the pressure sensor 10 can be preliminarily determined, thereby achieving rapid positioning and saving installation time.

[0046] like Figures 1 to 5As shown, the pressure bag 20 includes a base body 21, and a measuring cavity 212 and a flow channel 211 are provided in the base body 21. The measuring cavity 212 is located in the middle of the base body 21 for fluid to pass through. The flow channel 211 includes an inlet flow channel and an outlet flow channel, and the inlet flow channel and the outlet flow channel are respectively located on both sides of the measuring cavity 212; one end of the inlet flow channel is connected to the measuring cavity 212, and the other end of the inlet flow channel is used to connect to the inlet pipeline, and one end of the outlet flow channel is connected to the measuring cavity 212, and the other end of the outlet flow channel is used to connect to the outlet pipeline.

[0047] Preferably, the measuring cavity 212 is an arc-shaped cavity. The central space of the arc-shaped cavity is smaller than the surrounding space, which promotes the flow of fluid and avoids blood coagulation. In this embodiment, the fluid is blood; the inlet flow channel and the outlet flow channel are set at the same height and extend in the same direction, and the cross-sections of the inlet flow channel and the outlet flow channel are both circular; the cross-sectional areas of the inlet flow channel and the outlet flow channel are equal. In other embodiments, the fluid may also be other liquids, such as dialysate, replacement fluid, etc.

[0048] By setting up the measuring chamber 212, the fluid enters the measuring chamber 212 from the liquid inlet channel, so that the fluid is adjusted to a turbulent state and the flow is disordered; the flow range in the middle space of the measuring chamber 212 is narrow, and the flow range around it is wide, so that the fluid will not be in a laminar state in the measuring chamber 212, and the speed of the fluid will change continuously with the change of the cross-sectional area of ​​the space it flows through; when the fluid flows out through the liquid outlet channel, the fluid will gather.

[0049] Through simulation software analysis, when the simulation conditions are that the blood density is 1.060 kg / m3, the viscosity is 3.5 times that of water, the internal roughness of the substrate 21 is 3.2 microns, the blood flow rate in the inlet channel is 20 ml per second, and the blood pressure at the outlet channel is 300 mmHg; the measuring cavity 212 will not cause blood retention, that is, no dead cavity will be formed.

[0050] The pressure capsule 20 is arranged above the pressure sensor 10. The pressure capsule 20 also includes a pressure transmission component. The pressure transmission component is arranged at the bottom of the base 21 and is used to contact the pressure sensing component. After the pressure transmission component contacts the pressure sensing component, the pressure transmission component can be pressed against the pressure sensing component through threaded locking to transmit the pressure of the fluid in the pressure capsule 20.

[0051] In this embodiment, the pressure transmission part is a diaphragm 23, which is arranged on the base 21. The diaphragm 23 closes the measuring cavity 212 to isolate the fluid and the air. The diaphragm 23 can sense the pressure and separate the fluid and the air, effectively avoiding cross infection and improving the accuracy and precision of monitoring. In this embodiment, the diaphragm 23 is made of silicone material; the diaphragm 23 is exposed from the middle of the base 21, and the diaphragm 23 is used to fit closely with the diaphragm of the pressure sensor 10 to transmit the pressure to the diaphragm.

[0052] In order to fix the diaphragm 23 on the base 21, a slot structure is provided at the bottom of the base 21, and a convex structure is provided at the edge of the diaphragm 23. The slot structure is engaged with the convex structure by hot pressing and bending. By providing the slot structure at the bottom of the base 21 and clamping the diaphragm 23 in the slot structure by hot pressing and bending, the diaphragm 23 is prevented from being separated from the base 21 under the action of fluid pressure.

[0053] In this embodiment, the convex structure is convexly arranged on the edge of the diaphragm 23, the convex structure is annular, and the groove structure is also an annular groove, and the convex structure can be inserted into the groove structure and fixed by hot pressing and bending. By providing the annular convex structure and the annular groove, the edge of the diaphragm 23 is uniformly stressed, thereby ensuring that the diaphragm 23 is stably fixed on the base 21.

[0054] The pressure bag 20 also includes a connecting cylinder 22, which is rotatably arranged on the base 21. The diaphragm 23 can fit tightly with the diaphragm of the pressure sensor 10 to transmit the pressure to the diaphragm. The inner wall of the connecting cylinder 22 is provided with an internal thread that cooperates with the external thread structure 11. The main body of the pressure sensor 10 extends to the interior of the connecting cylinder 22. The pressure sensor 10 and the pressure bag 20 are connected by the threaded cooperation of the external thread structure 11 and the connecting cylinder 22.

[0055] Preferably, a gap is left between the connecting cylinder 22 and the base 21 in the radial direction, and the connecting cylinder 22 can rotate independently relative to the base 21. In this embodiment, the base 21 has a cylindrical clamping portion, and the connecting cylinder 22 is clamped with the clamping portion and can rotate relative to the clamping portion. A gap is left between the connecting cylinder 22 and the clamping portion, that is, the inner diameter of the connecting cylinder 22 is larger than the outer diameter of the clamping portion; specifically, the inner diameter of the connecting cylinder 22 is 1.5 mm larger than the outer diameter of the clamping portion. In other embodiments, the difference between the inner diameter of the connecting cylinder 22 and the outer diameter of the clamping portion can be adaptively adjusted according to the actual size of the pressure sensor 10 and the pressure capsule 20 to ensure that the connecting cylinder 22 can rotate independently relative to the base 21.

[0056] By providing an independently rotatable connecting cylinder 22, the connecting cylinder 22 is prevented from driving the base 21 to rotate when rotating, ensuring that the diaphragm 23 does not slide relative to the membrane after contacting, thereby improving the accuracy and stability of detection.

[0057] The following is the specific installation and use process of the pressure monitor:

[0058] The connecting cylinder 22 is connected to the base 21 , and the diaphragm 23 is fixed to the base 21 , thereby obtaining the pressure bag 20 .

[0059] The pressure capsule 20 is placed above the pressure sensor 10 so that the diaphragm 23 corresponds to the position of the membrane, and the connecting cylinder 22 is rotated and screwed onto the pressure sensor 10 to achieve the connection between the pressure sensor 10 and the pressure capsule 20 .

[0060] The fluid enters from the liquid inlet channel, passes through the measuring cavity 212, and finally flows out from the liquid outlet channel; the pressure generated by the fluid passing through the measuring cavity 212 is transmitted to the diaphragm 23 of the pressure bag 20, and the diaphragm 23 transmits the induced pressure to the diaphragm of the pressure sensor 10. The diaphragm generates strain, causing the strain resistor directly diffused on it to produce a change proportional to the measured pressure, and then the corresponding voltage output signal is obtained by the bridge circuit to test the corresponding pressure.

[0061] By arranging a rotatable connecting cylinder 22 on the base 21 and screwing the connecting cylinder 22 to make the connecting cylinder 22 and the pressure sensor 10 threadedly connected, the operation is simple, the cooperation is smooth, and the connection is stable, and there will be no accidental jamming. There is no need to additionally set up a fixed pressure head, the appearance is simple and smooth, and the formation of dead corners for cleaning and disinfection is avoided, which is convenient for clinical operation and use.

[0062] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A pressure monitor, characterized in that: include: A pressure sensor, wherein a pressure sensing element is provided on the top of the pressure sensor; The pressure bag comprises a base, a connecting cylinder and a pressure transmission component, wherein the connecting cylinder is rotatably arranged on the base and is threadedly connected to the pressure sensor; the pressure transmission component is arranged at the bottom of the base and is used to contact the pressure sensing component; after the pressure transmission component contacts the pressure sensing component, the connecting cylinder and the pressure sensor are threadedly locked, so that the pressure transmission component can be pressed against the pressure sensing component to transmit the pressure of the fluid in the pressure bag.

2. The pressure monitor according to claim 1, characterized in that: The pressure sensor is provided with an external thread structure, the inner wall of the connecting cylinder is provided with an internal thread, the pressure sensor part extends into the interior of the connecting cylinder and is threadably matched with the connecting cylinder through the external thread structure.

3. The pressure monitor according to claim 2, characterized in that: The external thread structure comprises at least three sections of discontinuous external threads with the same rotation direction.

4. The pressure monitor according to claim 1, characterized in that: The pressure transmission component is a diaphragm. A measuring cavity is provided in the base body for the fluid to pass through. The diaphragm is connected to the base body and closes the measuring cavity.

5. The pressure monitor according to claim 4, characterized in that: A slot structure is provided at the bottom of the base, a convex structure is provided at the edge of the diaphragm, and the slot structure is fixedly connected with the convex structure by hot pressing and bending.

6. The pressure monitor according to claim 4, characterized in that: The pressure sensing element is a diaphragm, and the diaphragm is arranged on the top surface of the pressure sensor; the diaphragm can be closely fitted with the diaphragm to transmit the pressure to the diaphragm.

7. The pressure monitor according to claim 4, characterized in that: The measuring cavity is an arc-shaped cavity, and the middle space of the arc-shaped cavity is smaller than the surrounding space.

8. The pressure monitor according to claim 4, characterized in that: The substrate further comprises a flow channel, wherein the flow channel comprises: A liquid inlet channel, connected to the measuring cavity to allow the fluid to enter; A liquid outlet channel is connected to the measuring cavity to allow the fluid to flow out.

9. The pressure monitor according to any one of claims 1 to 7, characterized in that: A gap is left between the connecting cylinder and the base in the radial direction, and the connecting cylinder can rotate independently relative to the base.

10. A blood purification device, characterized in that: It comprises a device body and a pressure monitor as described in any one of claims 1 to 9, wherein the pressure monitor is arranged on the device body.

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