CN213100048U - Needle is kept somewhere in blood sampling infusion in succession of vein - Google Patents
Needle is kept somewhere in blood sampling infusion in succession of vein Download PDFInfo
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- CN213100048U CN213100048U CN202021444737.XU CN202021444737U CN213100048U CN 213100048 U CN213100048 U CN 213100048U CN 202021444737 U CN202021444737 U CN 202021444737U CN 213100048 U CN213100048 U CN 213100048U
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- needle
- tubular structure
- catheter
- steel needle
- seat
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- 238000010241 blood sampling Methods 0.000 title claims abstract description 40
- 210000003462 vein Anatomy 0.000 title claims abstract description 28
- 238000001802 infusion Methods 0.000 title abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 67
- 239000010959 steel Substances 0.000 claims abstract description 67
- 230000001681 protective effect Effects 0.000 claims abstract description 10
- 238000001990 intravenous administration Methods 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims 1
- 210000004204 blood vessel Anatomy 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 2
- 239000008280 blood Substances 0.000 description 13
- 210000004369 blood Anatomy 0.000 description 13
- 238000010586 diagram Methods 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 244000052616 bacterial pathogen Species 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000017531 blood circulation Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 210000004761 scalp Anatomy 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The utility model provides a needle is kept somewhere in blood sampling infusion in succession of vein, including needle file, transparent pipe seat, pipe, steel needle, protective case, side direction pipe and side direction pipe end-to-end connection. The device has simple structure, not only facilitates blood sampling and transfusion, but also is safer, and can realize various requirements of continuous blood sampling and transfusion under the condition of not taking out the needle core, each part is connected closely through a threaded interface, the disassembly and the recovery are convenient, and the axial plugging can be realized through linkage operation, thereby being convenient for operation. Need not to get rid of the operation of nook closing member, both can prevent that the pjncture needle from bringing the risk of stabbing the operator, also can avoid getting rid of the not tight scheduling problem of pipeline shutoff that the nook closing member brought, and can avoid blood sampling in-process to prick the blood vessel well and lead to the puncture failure, convenient and fast and high-efficient more.
Description
Technical Field
The utility model belongs to the technical field of medical treatment laboratory supplies, concretely relates to needle is kept somewhere in blood sampling infusion in succession to vein.
Background
In the pharmacokinetic research, continuous multiple administration is often needed, blood sampling is needed at multiple time points, the use of a scalp steel needle is limited to short-term or single-dose administration or blood sample collection, and in order to meet the requirements of intermittent or continuous multiple blood sampling and administration, reduce the number of times of venipuncture and smoothly develop an experiment, an indwelling needle is adopted in the conventional method. The venous indwelling needle currently used in the market generally comprises a protective sleeve, a flexible pipe and a puncture needle. When the device is used, the puncture needle is punctured into a vein, the flexible pipe is introduced into the vein in an auxiliary mode, the puncture needle is drawn out after the success of vein puncture is confirmed by blood return, the flexible pipe is suspended in the vein, and administration and blood sampling operations are carried out through the suspended flexible pipe. However, the currently used venous indwelling needle usually needs to be drawn out after use, and the needle tip of the puncture needle is exposed outside without any protection measures, so that the operator is easily stabbed, and therefore, a safe continuous blood sampling and administration indwelling needle is needed to be designed.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a needle is kept somewhere in blood sampling infusion in succession to the vein, solve above-mentioned problem.
In order to solve the technical problem, the utility model provides a needle is kept somewhere in blood sampling infusion in succession to vein, include: a needle base, a transparent catheter base, a catheter, a steel needle, a protective sleeve, a lateral catheter and a lateral catheter tail end connecting piece,
the bottom end of the needle seat is connected with the top end of the transparent catheter seat, a groove is arranged on the needle seat, the transparent catheter seat is provided with a straight rod section and a side branch section, the straight rod section is of a hollow first tubular structure, the side branch section is of a hollow second tubular structure, the top end of the catheter is connected with the bottom end of the transparent catheter seat, the catheter is of a hollow third tubular structure, the first tubular structure is communicated with the third tubular structure, the top end of the steel needle penetrates through the groove and is exposed out of the needle seat, the steel needle is inserted into the needle seat, the first tubular structure and the third tubular structure from the groove, the lower half of the steel needle is of a hollow fourth tubular structure, at least one first through hole is arranged on the side wall of the lower half, the bottom end of the transparent catheter seat is sleeved with the protective sleeve, and the input end of the side catheter is connected with the transparent catheter seat, the lateral catheter is a hollow fifth tubular structure, the fifth tubular structure is communicated with the second tubular structure, the output end of the lateral catheter is connected with the bottom end of the lateral catheter end connecting piece, the lateral catheter end connecting piece is a hollow sixth tubular structure, and the fifth tubular structure is communicated with the sixth tubular structure.
As a preferred proposal of the vein continuous blood sampling transfusion remaining needle of the utility model, the groove is provided with a first transverse groove, a vertical groove and a second transverse groove, one end of the first transverse groove is communicated with the top end of the vertical groove, one end of the second transverse groove is connected with the bottom end of the vertical groove, so that the grooves form a laterally-placed concave structure, the steel needle is bent at a right angle, the center line of the top end of the steel needle is vertical to the center line of the bottom end of the steel needle, the top end of the steel needle slides in the groove, when the steel needle falls into the second transverse groove from the first transverse groove through the vertical groove, the bottom end of the steel needle extends out of the bottom end of the guide pipe, when the steel needle rises from the second transverse groove to the first transverse groove through the vertical groove, the bottom end of the steel needle retracts into the third tubular structure.
As an optimal scheme of needle is kept somewhere in blood sampling infusion in succession to vein the middle section cover of steel needle is equipped with at least one portable lumen shutoff accessory, first tubular structure is the gradually narrow lumen in both ends, works as when the steel needle rises or descends, portable lumen shutoff accessory is in slide from top to bottom in the first tubular structure.
As the utility model relates to a preferred scheme of needle is kept somewhere in blood sampling infusion in succession to vein, the number of portable lumen shutoff accessory is two.
As an optimal scheme of needle is kept somewhere in blood sampling infusion in succession to vein, the middle section of steel needle is provided with first screw thread, portable lumen shutoff accessory is equipped with the second through-hole, be equipped with the second screw thread in the second through-hole, first screw thread with second screw-thread fit, the steel needle with portable lumen shutoff accessory is through first screw thread and second threaded connection.
As the utility model relates to a preferred scheme of the vein continuous blood sampling transfusion remaining needle, the upper half of the steel needle is a solid tubular structure.
As a preferred scheme of needle is kept somewhere in blood sampling infusion in succession to vein, needle is kept somewhere in blood sampling infusion in succession to vein still includes the switch that ends, the switch that ends includes switch seat and switch knob, the switch seat includes third through-hole and jack, the central line of third through-hole with the central line of jack is perpendicular, the third through-hole with the jack intercommunication, through the third through-hole the switch seat cover is established on the outer wall of side direction pipe, switch knob's hypomere is inserted and is located in the jack, and with jack threaded connection.
As the utility model relates to a preferred scheme of needle is kept somewhere in blood sampling infusion in succession to vein, the bottom of needle file with threaded connection is passed through on the top of transparent pipe seat.
As the utility model relates to a preferred scheme of needle is kept somewhere in blood sampling infusion in succession to vein, the top cover of needle file is equipped with holds the needle handle, side direction pipe end-to-end connection's top lid is equipped with the terminal shutoff of side direction pipe.
As the utility model relates to a preferred scheme of needle is kept somewhere in blood sampling infusion in succession to vein, the needle file with hold and adopt threaded connection between the needle handle, side direction pipe end-to-end connection with adopt threaded connection between the shutoff of side direction pipe end.
Compared with the prior art, the utility model provides a needle is kept somewhere in blood sampling infusion in succession to vein, simple structure both makes things convenient for the blood sampling infusion, and is safer again, can just can realize each item requirement of blood sampling infusion in succession under the condition that does not take out the nook closing member, and each part passes through hickey zonulae occludens, conveniently dismantles the recovery, and the axial shutoff just can realize convenient operation through linkage operation. Need not to get rid of the operation of nook closing member, both can prevent that the pjncture needle from bringing the risk of stabbing the operator, also can avoid getting rid of the not tight scheduling problem of pipeline shutoff that the nook closing member brought, and can avoid blood sampling in-process to prick the blood vessel well and lead to the puncture failure, convenient and fast and high-efficient more.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor. Wherein,
FIG. 1 is a schematic view of a three-dimensional structure of a venous continuous blood sampling transfusion indwelling needle of the present invention;
FIG. 2 is a schematic view of the structure of the vein continuous blood sampling transfusion indwelling needle after the steel needle is lifted;
fig. 3 is a schematic view of the structure of the intravenous continuous blood sampling and transfusion indwelling needle after the steel needle descends.
Wherein: the device comprises a needle base 1, a transparent catheter base 2, a catheter 3, a steel needle 4, a protective sleeve 5, a lateral catheter 6, a lateral catheter end connector 7, a groove 8, a straight rod section 9, a lateral branch section 10, a first tubular structure 11, a first tubular structure 12, a third tubular structure 13, a fourth tubular structure 14, a first through hole 15, a fifth tubular structure 16, a sixth tubular structure 17, a first transverse groove 18, a vertical groove 19, a second transverse groove 20, a movable lumen plugging accessory 21, a switch base 22, a switch knob 23, a needle holding handle 24 and a lateral catheter end plug 25.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the following embodiments.
First, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with at least one implementation of the invention is included. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Secondly, the utility model discloses utilize the structure schematic diagram etc. to describe in detail, when detailing the utility model discloses the embodiment, for the convenience of explanation, the schematic diagram that shows a vein continuous blood sampling infusion keeps somewhere needle structure can not do local enlargement according to general proportion, moreover the schematic diagram is the example, and it should not limit the scope of the utility model protection here. In addition, the actual fabrication process should include three-dimensional space of length, width and depth.
Example 1
Referring to fig. 1-3, fig. 1 is a schematic perspective view of a venous continuous blood sampling transfusion indwelling needle according to the present invention; FIG. 2 is a schematic view of the structure of the vein continuous blood sampling transfusion indwelling needle after the steel needle is lifted; fig. 3 is a schematic view of the structure of the intravenous continuous blood sampling and transfusion indwelling needle after the steel needle descends. As shown in fig. 1 to 3, the intravenous continuous blood collection transfusion indwelling needle comprises: the device comprises a needle base 1, a transparent catheter base 2, a catheter 3, a steel needle 4, a protective sleeve 5, a lateral catheter 6 and a lateral catheter end connector 7. The structure and connection of the components are described in detail below.
The top end of the needle base 1 is sleeved with a needle holding handle 24, the needle base 1 is in threaded connection with the needle holding handle 24, the bottom end of the needle base 1 is connected with the top end of the transparent catheter base 2, a groove is arranged on the needle base 1, the groove 8 is provided with a first transverse groove 18, a vertical groove 19 and a second transverse groove 20, one end of the first transverse groove 18 is communicated with the top end of the vertical groove 19, one end of the second transverse groove 20 is connected with the bottom end of the vertical groove 19, so that the groove 8 forms a laterally-placed concave structure, the steel needle 4 is bent at a right angle, the center line of the top end of the steel needle 4 is perpendicular to the center line of the bottom end of the steel needle 4, the top end of the steel needle 4 slides in the groove 8, when the steel needle 4 falls into the second transverse groove 20 from the first transverse groove 18 through the vertical groove 19, the bottom end of the steel needle 4 extends out of the bottom end of the catheter 3, and when the steel needle 4 rises into the first transverse groove 18, the bottom end of the steel needle 4 is retracted into the third tubular structure 13. The needle head of the steel needle 4 at the front end can be controlled to extend out of and retract into the catheter 3 through the movement of the steel needle 4 in the groove 8 of the needle seat 1, and the protection function of puncturing blood vessels after successful puncturing and puncturing is realized. The bottom end of the needle base 1 is connected with the top end of the transparent catheter base 2 through threads.
The transparent catheter base 2 is provided with a straight rod section 9 and a side branch section 10, the straight rod section 9 is a hollow first tubular structure 11, the side branch section 10 is a hollow second tubular structure 12, a side catheter 6 is connected to the side face of the transparent catheter base 2, and various requirements such as blood collection, transfusion, plugging and the like can be met through a side catheter tail end connecting piece 7. The connection of the lateral duct end connection 7 can be a screw connection or a plug connection.
The top of pipe 3 is connected with the bottom of transparent pipe seat 2, pipe 3 is hollow third tubular structure 13, first tubular structure 11 and third tubular structure 13 intercommunication, the top of steel needle 4 passes recess 8, and expose in needle file 1, steel needle 4 is inserted from recess 8 and is located in needle file 1, first tubular structure 11 and third tubular structure 13, the lower half of steel needle 4 is hollow fourth tubular structure 14, and be equipped with at least one first through-hole 15 on the lateral wall of lower half, the first through-hole 15 of steel needle 4 opens in the first tubular structure 11 of transparent pipe seat 2, guarantee that blood can be in first tubular structure 11, conveniently observe in the puncture process, ensure that the puncture is successful. The middle section of the steel needle 4 is sleeved with at least one movable lumen plugging accessory 21, the first tubular structure 11 is a lumen with two gradually narrowed ends, and when the steel needle 4 ascends or descends, the movable lumen plugging accessory 21 slides up and down in the first tubular structure 11. In the figure, the number of the movable lumen occluding fittings 21 is two. The movable lumen sealing fitting 21 can be controlled to seal the first tubular structure 11 by moving the steel needle 4 in the groove 8 of the needle seat 1. The middle section of the steel needle 4 is provided with a first thread (not shown), the movable lumen plugging fitting 21 is provided with a second through hole (not shown), the second through hole is internally provided with a second thread (not shown), the first thread is matched with the second thread, and the steel needle 4 is connected with the movable lumen plugging fitting 21 through the first thread and the second thread. Through set up the screw thread face in 4 middle sections of steel needle, install the portable lumen shutoff accessories 21 of the inside cavity cylinder type that has the screw thread on it for portable lumen shutoff accessories 21 can relax the realization to the shutoff of first tubular structure 11 at the gradual narrow intraluminal back-and-forth movement in both ends, prevent the top of the first tubular structure 11 of blood flow direction, guarantee that blood can only flow to side direction pipe 6, realize the needs of continuous blood sampling. The upper half section of the steel needle 4 is of a solid tubular structure.
The bottom end of the transparent catheter base 2 is sleeved with a protective sleeve 5 for covering the bottom ends of the catheter 3 and the steel needle 4 to avoid being polluted by external bacteria and germs.
The input end of the lateral catheter 6 is connected with the transparent catheter seat 2, the lateral catheter 6 is a hollow fifth tubular structure 16, the fifth tubular structure 16 is communicated with the second tubular structure 12, the intravenous continuous blood sampling and transfusion indwelling needle further comprises a flow stopping switch (not shown), the flow stopping switch comprises a switch seat 22 and a switch knob 23, the switch seat 22 comprises a third through hole (not shown) and a jack (not shown), the central line of the third through hole is perpendicular to the central line of the jack, the third through hole is communicated with the jack, the switch seat 22 is sleeved on the outer wall of the lateral catheter 6 through the third through hole, and the lower section of the switch knob 23 is inserted into the jack and is in threaded connection with the jack. The stop switch serves to open and close the lateral conduit 6 and facilitate the connection of the lateral conduit end connector 7 to various related components, including connecting a blood collection tube, an infusion set, etc.
The output end of the lateral conduit 6 is connected with the bottom end of the lateral conduit end connector 7, the lateral conduit end connector 7 is a sixth hollow tubular structure 17, and the fifth tubular structure 16 is communicated with the sixth tubular structure 17. The lateral catheter tip connector 7 may be used to circumscribe various external connectors, such as: a blood collection and infusion device (not shown). The top end cap of the lateral catheter tip connection 7 is provided with a lateral catheter tip block 25. The lateral catheter end connector 7 is in threaded connection with the lateral catheter end plug 25. The lateral catheter tip closure 25 seals the lateral catheter tip connection 7 to prevent bacteria or germs from entering the interior of the sixth tubular structure 17 when the lateral catheter tip connection 7 is not connected to an external connection.
The principle of the above structure is that the steel needle 4 is moved in the groove 8 from the first transverse groove 18 to the position of the second transverse groove 20, the protective sleeve 5 is opened, the needle point of the steel needle 4 is exposed, the vein is punctured, blood enters the fourth tubular structure 14 and flows out from the first through hole 15, and due to the existence of the movable lumen blocking fitting 21, the blood is collected at the middle lower part of the first tubular structure 11 and flows to the second tubular structure 12, the fifth tubular structure 16 and the sixth tubular structure 17 until flowing into external equipment such as a blood storage device. Or the medicine enters the middle lower part of the first tubular structure 11 from an external device through the sixth tubular structure 17, the fifth tubular structure 16 and the second tubular structure 12, then flows into the fourth tubular structure 14 through the first through hole 15, and then flows into the vein from the needle head of the steel needle 4.
It should be understood by those skilled in the art that one of the features or objects of the present invention is to: the utility model provides a needle is kept somewhere in blood sampling infusion in succession to vein had both had the infusion function, had the blood sampling function again, and is safe, is favorable to conveniently gathering the blood sample of various organisms fast, has avoided simultaneously needle point to puncture the phenomenon that the blood vessel leads to the puncture failure when taking a blood sample to can reduce the misery that many times puncture brought for the organism, be a safe efficient device.
It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (10)
1. A vein continuous blood sampling transfusion retention needle is characterized by comprising: a needle base, a transparent catheter base, a catheter, a steel needle, a protective sleeve, a lateral catheter and a lateral catheter tail end connecting piece,
the bottom end of the needle seat is connected with the top end of the transparent catheter seat, a groove is arranged on the needle seat, the transparent catheter seat is provided with a straight rod section and a side branch section, the straight rod section is of a hollow first tubular structure, the side branch section is of a hollow second tubular structure, the top end of the catheter is connected with the bottom end of the transparent catheter seat, the catheter is of a hollow third tubular structure, the first tubular structure is communicated with the third tubular structure, the top end of the steel needle penetrates through the groove and is exposed out of the needle seat, the steel needle is inserted into the needle seat, the first tubular structure and the third tubular structure from the groove, the lower half of the steel needle is of a hollow fourth tubular structure, at least one first through hole is arranged on the side wall of the lower half, the bottom end of the transparent catheter seat is sleeved with the protective sleeve, and the input end of the side catheter is connected with the transparent catheter seat, the lateral catheter is a hollow fifth tubular structure, the fifth tubular structure is communicated with the second tubular structure, the output end of the lateral catheter is connected with the bottom end of the lateral catheter end connecting piece, the lateral catheter end connecting piece is a hollow sixth tubular structure, and the fifth tubular structure is communicated with the sixth tubular structure.
2. The intravenous continuous blood-taking transfusion indwelling needle as claimed in claim 1, wherein: the groove is provided with a first transverse groove, a vertical groove and a second transverse groove, one end of the first transverse groove is communicated with the top end of the vertical groove, one end of the second transverse groove is connected with the bottom end of the vertical groove, so that the groove forms a laterally-placed concave structure, the steel needle is bent at a right angle, the central line of the top end of the steel needle is perpendicular to the central line of the bottom end of the steel needle, the top end of the steel needle slides in the groove, when the steel needle passes through the first transverse groove and falls into the second transverse groove, the bottom end of the steel needle extends out of the bottom end of the catheter, and when the steel needle passes through the second transverse groove and rises into the first transverse groove, the bottom end of the steel needle retracts into the third tubular structure.
3. The intravenous continuous blood-taking transfusion indwelling needle as claimed in claim 2, wherein: the middle section cover of steel needle is equipped with at least one portable lumen shutoff accessory, first tubular structure is the gradual narrow lumen in both ends, works as when the steel needle rises or descends, portable lumen shutoff accessory is in slide from top to bottom in the first tubular structure.
4. The intravenous continuous blood-taking transfusion indwelling needle as claimed in claim 3, wherein: the number of the movable lumen plugging accessories is two.
5. The intravenous continuous blood-taking transfusion indwelling needle as claimed in claim 3, wherein: the middle section of steel needle is provided with first screw thread, portable lumen shutoff accessory is equipped with the second through-hole, be equipped with the second screw thread in the second through-hole, first screw thread with second screw-thread fit, the steel needle with portable lumen shutoff accessory passes through first screw thread and second threaded connection.
6. The intravenous continuous blood-taking transfusion indwelling needle as claimed in claim 1, wherein: the upper half section of the steel needle is of a solid tubular structure.
7. The intravenous continuous blood-taking transfusion indwelling needle as claimed in claim 1, wherein: the venous continuous blood sampling transfusion remaining needle further comprises a flow stopping switch, the flow stopping switch comprises a switch seat and a switch knob, the switch seat comprises a third through hole and a jack, the center line of the third through hole is perpendicular to the center line of the jack, the third through hole is communicated with the jack, the switch seat is sleeved on the outer wall of the lateral catheter through the third through hole, and the lower section of the switch knob is inserted into the jack and is in threaded connection with the jack.
8. The intravenous continuous blood-taking transfusion indwelling needle as claimed in claim 1, wherein: the bottom end of the needle base is connected with the top end of the transparent catheter base through threads.
9. The intravenous continuous blood-taking transfusion indwelling needle as claimed in claim 1, wherein: the top end of the needle base is sleeved with a needle holding handle, and the top end cover of the lateral catheter tail end connecting piece is provided with a lateral catheter tail end plug.
10. The intravenous continuous blood-taking transfusion indwelling needle as claimed in claim 9, wherein: the needle base is in threaded connection with the needle holding handle, and the lateral catheter tail end connecting piece is in threaded connection with the lateral catheter tail end plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021444737.XU CN213100048U (en) | 2020-07-21 | 2020-07-21 | Needle is kept somewhere in blood sampling infusion in succession of vein |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021444737.XU CN213100048U (en) | 2020-07-21 | 2020-07-21 | Needle is kept somewhere in blood sampling infusion in succession of vein |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213100048U true CN213100048U (en) | 2021-05-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021444737.XU Active CN213100048U (en) | 2020-07-21 | 2020-07-21 | Needle is kept somewhere in blood sampling infusion in succession of vein |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213100048U (en) |
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2020
- 2020-07-21 CN CN202021444737.XU patent/CN213100048U/en active Active
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