CN220158877U - Pressure transmission device for blood purification pipeline - Google Patents
Pressure transmission device for blood purification pipeline Download PDFInfo
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- CN220158877U CN220158877U CN202321537635.6U CN202321537635U CN220158877U CN 220158877 U CN220158877 U CN 220158877U CN 202321537635 U CN202321537635 U CN 202321537635U CN 220158877 U CN220158877 U CN 220158877U
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- transmission device
- blood purification
- pressure transmission
- positioning groove
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- 239000008280 blood Substances 0.000 title claims abstract description 53
- 210000004369 blood Anatomy 0.000 title claims abstract description 53
- 230000005540 biological transmission Effects 0.000 title claims abstract description 51
- 238000000746 purification Methods 0.000 title claims abstract description 37
- 230000004087 circulation Effects 0.000 claims abstract description 41
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 239000012528 membrane Substances 0.000 claims abstract description 19
- 238000003466 welding Methods 0.000 claims description 27
- 238000004891 communication Methods 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000015271 coagulation Effects 0.000 abstract description 4
- 238000005345 coagulation Methods 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 description 10
- 230000000903 blocking effect Effects 0.000 description 7
- 238000000502 dialysis Methods 0.000 description 7
- 230000017531 blood circulation Effects 0.000 description 5
- 239000002904 solvent Substances 0.000 description 4
- 239000003292 glue Substances 0.000 description 3
- 238000001631 haemodialysis Methods 0.000 description 2
- 230000000322 hemodialysis Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000023555 blood coagulation Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Abstract
The utility model provides a pressure transmission device for a blood purification pipeline, and belongs to the technical field of blood purification. It has solved the easy flexible problem of pressure conduction diaphragm among the current pressure transmission device for the blood purification pipeline. The device comprises an upper shell with a connecting port, a lower shell with a liquid inlet and a liquid outlet, and a pressure conduction membrane arranged between the upper shell and the lower shell, wherein a circulation chamber is formed between the pressure conduction membrane and the lower shell, the liquid inlet and the liquid outlet are communicated with the circulation chamber, an air pressure conduction chamber is formed between the pressure conduction membrane and the upper shell, the connecting port is communicated with the air pressure conduction chamber, and the middle part of the pressure conduction membrane is recessed into the circulation chamber to form a concave part. The concave part is positioned in the circulation chamber, occupies part of the space of the circulation chamber, and has strong mobility and short residence time of blood entering the circulation chamber, thereby reducing the coagulation risk; the pressure conducting diaphragm provided with the concave part has better deformation resistance, and the measurement accuracy of the pressure transmission device is improved.
Description
Technical Field
The utility model belongs to the technical field of blood purification, and relates to a pressure transmission device for a blood purification pipeline.
Background
The pressure sensing mode of the blood purifying and circulating pipeline is that a T-shaped three-way joint is additionally arranged at a proper position of a main pipe of the blood purifying and circulating pipeline, the front end and the rear end of the T-shaped three-way joint are respectively connected with the main pipe and serve as an inlet and outlet end of blood in the pipeline, a side outlet end of the T-shaped three-way joint is connected with a branch pipe and serves as a pressure conduction channel, the tail end of the pressure conduction channel is bonded with a threaded luer joint, the luer joint is connected with a sensor protector with a hydrophobic diaphragm (the diaphragm can pass through gas and can not pass through liquid) inside, and then the sensor protector is connected with a pressure sensing device on a dialysis machine. When blood in the blood purification and circulation pipeline flows through the T-shaped tee joint, pressure acts on the side branch pipe and pushes air, and real-time pressure is transmitted to the pressure sensing device of the dialysis machine, so that the pressure in the blood purification and circulation pipeline is monitored in real time by the dialysis machine. Since the blood inside the pressure conducting branch pipe is in direct contact with the air, the risk of blood contamination increases.
To this end, chinese patent discloses a pressure output device for an extracorporeal hemodialysis machine [ patent number CN106573095a ] comprising a Pressure Output Device (POD) assembly for sensing fluid pressure in a fluid treatment system, the POD assembly comprising a housing defining a housing interior and a movable diaphragm disposed within the housing interior and separating the housing interior into a flow-through chamber and a pressure sensing side, a sensor port in fluid communication with the pressure sensing side, an inlet port and an outlet port in fluid communication with the flow-through chamber, the inlet port and the outlet port defining an inlet and an outlet, respectively, of a flow-through channel through the flow-through chamber, a boss protruding from an inner wall of the housing and extending into the flow-through channel to prevent blocking of flow under different pressure conditions within the flow-through chamber. The key component that serves to divide the flow-through chamber and the pressure sensing side is an elastic diaphragm, which is in the shape of a circular sheet. When blood flows through the flow side of the POD assembly, positive or negative pressure causes the diaphragm to shift up and down, and the corresponding displacement of the diaphragm compresses or expands the volume of air between the diaphragm and the pressure transducer in the hemodialysis machine, and as the volume of air changes, the generated pressure is detected by the pressure transducer, thereby realizing real-time monitoring of the pressure by the dialysis machine.
In the above-mentioned POD subassembly, because circular diaphragm mid portion direct suspension in the flow cell, under the prerequisite that the middle part lacks the support, receive the range and the frequency of flow cell pressure up-and-down vibration when too big, can warp in the middle of the circular diaphragm after the use a period, lead to the diaphragm unable complete recovery, can not get back to 0 mmHg's middle initial position, just at this moment need frequently correct the wrong position of diaphragm in the treatment for the operation degree of difficulty of treatment increases, and the risk increases, and many times correction also can make pressure output device's measurement accuracy reduce, thereby influences normal use. The round diaphragm is placed at the uppermost end of the blood circulation chamber, is far away from the inlet and outlet ends of the blood circulation chamber, has large space of the whole blood circulation chamber, and can weaken the fluidity of blood in the blood circulation chamber, so that the blood retention time is overlong and the blood coagulation risk is increased.
Disclosure of Invention
The present utility model has been made in view of the above problems occurring in the prior art, and an object of the present utility model is to provide a pressure transmission device for a blood purification line, which has a small deformation of a diaphragm.
The aim of the utility model can be achieved by the following technical scheme:
the utility model provides a pressure transmission device for blood purification pipeline, includes the last casing that has the connector, has the inferior valve that inlet and liquid outlet and locates the pressure conduction diaphragm between last casing and the inferior valve, form the circulation room between pressure conduction diaphragm and the inferior valve, inlet and liquid outlet communicate with the circulation room respectively, form air pressure conduction room between pressure conduction diaphragm and the last casing, connector and air pressure conduction room intercommunication, the middle part of pressure conduction diaphragm is to the recess formation concave part of circulation room.
The connecting port is used as an output port of the air pressure conduction chamber, the connecting port is bonded with the conduction branch pipe through a solvent, and the conduction branch pipe is communicated with a pressure sensing device port of the dialysis machine through a luer connector. The liquid inlet and the liquid outlet are respectively bonded with the blood purifying pipeline through a solvent (such as medical glue).
When the pressure conduction diaphragm is at the initial position of 0mmHg, the concave part is positioned in the circulation chamber, occupies part of the space of the circulation chamber, and the blood entering the circulation chamber has strong mobility and short residence time in the circulation chamber, thereby reducing the coagulation risk. The concave part is arranged on the pressure conduction diaphragm when leaving the factory, has better deformation resistance, can solve the problem of deformation of the existing circular diaphragm, and increases the measurement accuracy of the pressure transmission device.
In the pressure transmission device for the blood purification pipeline, the lower shell is internally provided with a supporting rib. The support rib is located under the concave portion, when negative pressure in the circulation chamber is continuously increased, the pressure conduction membrane cannot be completely wrinkled to be attached to the inner wall of the circulation chamber under the action of the support rib, and smooth circulation of fluid in the circulation chamber is guaranteed.
In the pressure transmission device for the blood purification pipeline, the liquid inlet and the liquid outlet are arranged oppositely, and the supporting ribs are positioned on the communication passage of the liquid inlet and the liquid outlet.
The support rib position extends along the length direction of the liquid inlet and liquid outlet communication passage, the width of the support rib position is smaller than that of the communication passage, and the pressure conduction diaphragm cannot be completely wrinkled to be attached to the inner wall of the circulation chamber under the action of the support rib position under negative pressure, so that smooth circulation of fluid in the circulation chamber is ensured.
In the pressure transmission device for the blood purification pipeline, a first positioning groove surrounding the circulation chamber is formed in the lower shell, a first positioning protrusion opposite to the first positioning groove is arranged on the pressure conduction diaphragm, and the first positioning protrusion is embedded and attached in the first positioning groove when the upper shell is buckled with the lower shell.
In the pressure transmission device for the blood purification pipeline, the pressure conduction diaphragm is provided with a second positioning groove which is arranged around the circulation chamber, the upper shell is provided with a second positioning protrusion which is arranged opposite to the second positioning groove, and the second positioning protrusion is embedded and attached in the second positioning groove when the upper shell is buckled with the lower shell.
In the pressure transmission device for a blood purification pipeline, the second positioning groove is arranged on one side of the first positioning protrusion away from the first positioning groove.
The pressure-transmitting diaphragm is prevented from being displaced during the pressure deformation.
In the pressure transmission device for the blood purification pipeline, the lower shell is provided with the welding rib which is arranged around the first positioning groove, the upper shell is provided with the annular groove which is arranged opposite to the welding rib, and the welding rib is fixedly connected in the annular groove.
After welding the welding rib and the annular groove together by ultrasonic welding, the upper shell and the lower shell are assembled in place, and the pressure conducting diaphragm is pressed between the upper shell and the lower shell.
In the pressure transmission device for the blood purification pipeline, the lower shell is further provided with a third positioning protrusion surrounding the circulation chamber, the upper shell is provided with a third positioning groove opposite to the third positioning protrusion, the welding rib is arranged on the third positioning protrusion, and the annular groove is arranged in the third positioning groove.
The third positioning bulge is positioned on the outer side of the pressure conducting diaphragm to protect the pressure conducting diaphragm and prevent the pressure conducting diaphragm from being damaged from the outside.
In the pressure transmission device for the blood purification pipeline, the upper shell is further provided with an annular blocking edge extending to the outer side of the third positioning protrusion. The annular blocking edge protects the third positioning protrusion and the welding rib.
The method comprises the steps of firstly matching a second positioning groove on a pressure conduction diaphragm with a second positioning protrusion on an upper shell, embedding and attaching the second positioning groove on the pressure conduction diaphragm with the second positioning protrusion on the upper shell during assembly, then installing the upper shell assembled with the pressure conduction diaphragm into a lower shell, clamping a third positioning groove of the upper shell into the third positioning protrusion of the lower shell, embedding and attaching a first positioning protrusion of the pressure conduction diaphragm into a first positioning groove, matching welding ribs in an annular groove at the moment, and finally welding the welding ribs on the lower shell with the annular groove of the upper shell through ultrasonic welding equipment and a tool, so that a complete pressure transmission device for a blood purification pipeline is obtained.
Compared with the prior art, the pressure transmission device for the blood purification pipeline has the following advantages: the pressure conduction membrane is arranged, so that the direct contact of blood in the blood purification pipeline with air is avoided, and the risk of blood pollution is reduced; because the concave part is arranged in the circulation chamber, the concave part occupies part of the space of the circulation chamber, and the blood entering the circulation chamber has strong mobility and short residence time in the circulation chamber, thereby reducing the coagulation risk; the concave part is arranged on the pressure transmission diaphragm when leaving the factory, has better deformation resistance, can improve the problem of deformation of the existing circular diaphragm, and increases the measurement precision of the pressure transmission device; the circulation chamber is designed with a support rib to prevent the excessive negative pressure in the circulation chamber from causing the pressure conduction membrane to be completely attached to the inner wall of the lower shell and blocking the circulation chamber.
Drawings
Fig. 1 is a schematic diagram of the structure of the pressure transmission device for a blood purification line.
Fig. 2 is a cross-sectional view of the pressure transmission device for a blood purification tube.
Fig. 3 is a further cross-sectional view of the pressure transmission device for a blood purification tube.
In the figure, 1, an upper shell; 10. a connection port; 11. an air pressure conduction chamber; 12. a second positioning protrusion; 13. a third positioning groove; 14. an annular blocking edge; 2. a lower housing; 20. a liquid inlet; 21. a liquid outlet; 22. a flow-through chamber; 23. supporting the rib position; 24. a first positioning groove; 25. welding ribs; 26. a third positioning protrusion; 3. a pressure-conducting diaphragm; 30. a concave portion; 31. a first positioning protrusion; 32. and a second positioning groove.
Detailed Description
The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.
The pressure transmission device for the blood purification pipeline shown in fig. 1-3 comprises an upper shell 1 and a lower shell 2, wherein a connecting port 10 is arranged at the top of the upper shell 1, the connecting port 10 is used as an output port of an air pressure conduction chamber 11, the connecting port 10 is bonded with a conduction branch pipeline through a solvent (such as medical glue), and the conduction branch pipeline is communicated with a pressure sensing device port of a dialysis machine through a luer connector. As shown in fig. 1 and 2, the lower housing 2 is provided with a liquid inlet 20 and a liquid outlet 21 which are arranged oppositely, and the liquid inlet 20 and the liquid outlet 21 are respectively bonded with the blood purifying pipeline through a solvent (such as medical glue).
As shown in fig. 2 and 3, a pressure conducting membrane 3 is disposed between the upper casing 1 and the lower casing 2, a flow chamber 22 is formed between the pressure conducting membrane 3 and the lower casing 2, a liquid inlet 20 and a liquid outlet 21 are respectively communicated with the flow chamber 22, an air pressure conducting chamber 11 is formed between the pressure conducting membrane 3 and the upper casing 1, a connection port 10 is communicated with the air pressure conducting chamber 11, the middle part of the pressure conducting membrane 3 is recessed into the flow chamber 22 to form a recessed part 30, and the recessed part 30 is formed on the pressure conducting membrane 3 when leaving a factory.
When the pressure transmission diaphragm 3 is at the initial position of 0mmHg, the concave portion 30 is located in the flow chamber 22, occupies part of the space of the flow chamber 22, and has strong fluidity and short residence time of blood entering the flow chamber 22 in the flow chamber 22, thereby reducing the coagulation risk. The concave part 30 is arranged on the pressure transmission diaphragm 3 when leaving the factory, has better deformation resistance, can solve the problem of deformation of the existing circular diaphragm, and increases the measurement accuracy of the pressure transmission device.
As shown in fig. 2 and 3, a supporting rib position 23 is disposed in the lower housing 2, the supporting rib position 23 is located under the concave portion 30 and on the communication path between the liquid inlet 20 and the liquid outlet 21, the supporting rib position 23 extends along the length direction of the communication path between the liquid inlet 20 and the liquid outlet 21, the width of the supporting rib position is smaller than that of the communication path, and the pressure conducting membrane 3 is not completely folded under the action of the supporting rib position 23 to be attached to the inner wall of the circulation chamber 22 under the negative pressure, so that smooth circulation of fluid in the circulation chamber 22 is ensured.
In order to prevent the pressure-conducting membrane 3 from being displaced during the process of being subjected to pressure deformation, as shown in fig. 2 and 3, a first positioning groove 24 is formed on the lower housing 2 and surrounds the flow chamber 22, a first positioning protrusion 31 is formed on the pressure-conducting membrane 3 and is disposed opposite to the first positioning groove 24, and the first positioning protrusion 31 is embedded and attached in the first positioning groove 24 when the upper housing 1 is buckled with the lower housing 2.
As shown in fig. 2 and 3, the pressure-conducting membrane 3 is provided with a second positioning groove 32 surrounding the flow-through chamber 22, the upper shell 1 is provided with a second positioning protrusion 12 opposite to the second positioning groove 32, and the second positioning protrusion 12 is embedded and attached in the second positioning groove 32 when the upper shell 1 is buckled with the lower shell 2. Wherein the second positioning groove 32 is disposed on a side of the first positioning protrusion 31 away from the first positioning groove 24.
As shown in fig. 2 and 3, the lower housing 2 is provided with a welding rib 25 disposed around the first positioning groove 24, the upper housing 1 is provided with an annular groove disposed opposite to the welding rib 25, and the welding rib 25 is fixedly connected in the annular groove. After welding the weld bead 25 with the annular groove by ultrasonic welding, the upper case 1 and the lower case 2 are assembled in place, and the pressure-transmitting diaphragm 3 is compressed between the upper case 1 and the lower case 2.
As shown in fig. 2 and 3, the lower housing 2 is further provided with a third positioning protrusion 26 disposed around the flow-through chamber 22, the upper housing 1 is provided with a third positioning groove 13 disposed opposite to the third positioning protrusion 26, the welding rib 25 is disposed on the third positioning protrusion 26, and the annular groove is disposed in the third positioning groove 13. The third positioning boss 26 is located outside the pressure-conducting diaphragm 3, and protects the pressure-conducting diaphragm 3 from being damaged from the outside.
As shown in fig. 2 and 3, the upper housing 1 is further provided with an annular blocking edge 14 extending to the outer side of the third positioning protrusion 26, and the annular blocking edge 14 protects the third positioning protrusion 26 and the welding rib 25.
Before assembly, first, the second positioning groove 32 on the pressure conduction diaphragm 3 is matched with the second positioning protrusion 12 on the upper shell 1, when the assembly is performed, the second positioning groove 32 on the pressure conduction diaphragm 3 is embedded and attached with the second positioning protrusion 12 on the upper shell 1, then the upper shell 1 assembled with the pressure conduction diaphragm 3 is installed into the lower shell 2, the third positioning groove 13 of the upper shell 1 is clamped into the third positioning protrusion 26 of the lower shell 2, meanwhile, the first positioning protrusion 31 of the pressure conduction diaphragm 3 is embedded and attached into the first positioning groove 24, at the moment, the welding rib 25 is matched in the annular groove, and finally, the welding rib 25 on the lower shell 2 is welded with the annular groove of the upper shell 1 through ultrasonic welding equipment and tools, so that a complete pressure transmission device for the blood purification pipeline is obtained.
When the pressure transmission device is in an initial state of use after being connected with the blood purification pipeline, the pressure transmission diaphragm 3 is positioned at the initial position of 0 mmHg. When the fluid passes through the circulation chamber 22 and gradually generates negative pressure, the pressure transmission membrane 3 gradually contracts and deforms towards the inner side of the shell 2, so that the air volume in the air pressure transmission chamber 11 is increased; when the fluid passes through the flow chamber 22 and gradually generates positive pressure, the pressure conduction diaphragm 3 expands and deforms towards the inner side of the casing 1, so that the volume of air in the air pressure conduction chamber 11 becomes smaller, and the pressure is conducted to the pressure sensing device of the dialysis machine through the conduction branch pipe line adhered to the connection port 10.
The pressure transmission device is used in a venous line and a filtrate line, and when the pressure transmission diaphragm 3 is completely attached to the inner wall of the upper casing 1, the pressure transmission diaphragm 3 is in a maximum positive pressure state (700 mmHg), and the air volume in the air pressure transmission chamber 11 is minimized.
The pressure transmission device is used in an arterial line, the pressure transmission diaphragm 3 is in a maximum arterial negative pressure state (-500 mmHg), and the air volume in the air pressure transmission chamber 1113 reaches the maximum. The pressure conduction diaphragm 3 is supported by the supporting rib position 23 in the inner cavity of the lower shell 2, and can not be completely folded and attached due to the fact that the negative pressure in the circulation chamber 22 is continuously increased, so that smooth flow of fluid in the circulation chamber 22 is ensured.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.
Claims (9)
1. The utility model provides a pressure transmission device for blood purification pipeline, its characterized in that includes last casing (1) that has connector (10), has lower casing (2) of inlet (20) and liquid outlet (21), and locates pressure conduction diaphragm (3) between last casing (1) and lower casing (2), form circulation room (22) between pressure conduction diaphragm (3) and lower casing (2), inlet (20) and liquid outlet (21) communicate with circulation room (22) respectively, form air pressure conduction room (11) between pressure conduction diaphragm (3) and the last casing (1), connector (10) and air pressure conduction room (11) intercommunication, the middle part of pressure conduction diaphragm (3) is concave to circulation room (22) formation recess (30).
2. Pressure transmission device for a blood purification line according to claim 1, characterized in that the lower housing (2) is provided with a support rib (23).
3. The pressure transmission device for a blood purification tube according to claim 2, wherein the liquid inlet (20) is disposed opposite to the liquid outlet (21), and the support rib (23) is disposed on a communication path between the liquid inlet (20) and the liquid outlet (21).
4. The pressure transmission device for a blood purification line according to claim 1, wherein the lower case (2) is provided with a first positioning groove (24) provided around the flow chamber (22), the pressure transmission membrane (3) is provided with a first positioning protrusion (31) provided opposite to the first positioning groove (24), and the first positioning protrusion (31) is embedded and attached in the first positioning groove (24) when the upper case (1) is fastened to the lower case (2).
5. The pressure transmission device for a blood purification line according to claim 4, wherein the pressure transmission membrane (3) is provided with a second positioning groove (32) arranged around the flow chamber (22), the upper housing (1) is provided with a second positioning protrusion (12) arranged opposite to the second positioning groove (32), and the second positioning protrusion (12) is embedded and attached in the second positioning groove (32) when the upper housing (1) is buckled with the lower housing (2).
6. The pressure transmission device for a blood purification tube according to claim 5, wherein the second positioning groove (32) is provided on a side of the first positioning protrusion (31) away from the first positioning groove (24).
7. The pressure transmission device for a blood purification pipeline according to claim 4, wherein the lower shell (2) is provided with a welding rib (25) arranged around the first positioning groove (24), the upper shell (1) is provided with an annular groove arranged opposite to the welding rib (25), and the welding rib (25) is fixedly connected in the annular groove.
8. The pressure transmission device for a blood purification line according to claim 7, wherein the lower housing (2) is further provided with a third positioning protrusion (26) disposed around the flow-through chamber (22), the upper housing (1) is provided with a third positioning groove (13) disposed opposite to the third positioning protrusion (26), the welding rib (25) is disposed on the third positioning protrusion (26), and the annular groove is disposed in the third positioning groove (13).
9. The pressure transmission device for a blood purification tube according to claim 8, wherein the upper case (1) is further provided with an annular flange (14) extending to the outside of the third positioning boss (26).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321537635.6U CN220158877U (en) | 2023-06-15 | 2023-06-15 | Pressure transmission device for blood purification pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321537635.6U CN220158877U (en) | 2023-06-15 | 2023-06-15 | Pressure transmission device for blood purification pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220158877U true CN220158877U (en) | 2023-12-12 |
Family
ID=89053149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321537635.6U Active CN220158877U (en) | 2023-06-15 | 2023-06-15 | Pressure transmission device for blood purification pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220158877U (en) |
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2023
- 2023-06-15 CN CN202321537635.6U patent/CN220158877U/en active Active
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