CN209827972U - Medical one-way valve - Google Patents
Medical one-way valve Download PDFInfo
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- CN209827972U CN209827972U CN201920508580.3U CN201920508580U CN209827972U CN 209827972 U CN209827972 U CN 209827972U CN 201920508580 U CN201920508580 U CN 201920508580U CN 209827972 U CN209827972 U CN 209827972U
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- groove
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- check valve
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Abstract
The utility model discloses a medical check valve, it includes: the first valve body comprises a butt joint seat, the butt joint seat is provided with a first accommodating groove, and the bottom wall of the first accommodating groove is provided with a first flow limiting hole and an arc-shaped flange arranged around the first flow limiting hole; the second valve body comprises a connecting seat provided with a second accommodating groove, a second flow limiting hole and a supporting piece are arranged on the bottom wall of the groove, a limiting step is formed on the inner wall of the groove, the connecting seat is connected with the butt-joint seat to form a containing cavity, and the limiting step is matched with the arc-shaped flange to form a first limiting groove; the arc-shaped part of the sealing ring is abutted against the arc-shaped flange, and the abutting part is in limit abutment with the limit step; the flow limiting piece is accommodated in the accommodating cavity, and when the first flow limiting hole feeds liquid, the flow limiting piece floats in the accommodating cavity or is abutted against the support piece, so that the accommodating cavity is communicated with the second flow limiting hole; when the second flow-limiting hole feeds liquid, the flow-limiting piece is in sealing butt joint with the sealing ring, so that the containing cavity is separated from the first flow-limiting hole. The technical scheme of the utility model aims at improving the leakproofness of medical check valve.
Description
Technical Field
The utility model relates to the technical field of medical equipment, in particular to medical check valve.
Background
The one-way valve is used for connecting an infusion apparatus and an infusion needle assembly, the liquid outlet end of the one-way valve is usually connected with an infusion needle, and the liquid inlet end of the one-way valve is usually connected with the infusion apparatus during infusion. In medical devices, high-speed suction of medical liquids using a check valve does not generate bubbles and can be reversely sealed under high pressure, and thus, the one-way valve is widely used in medical devices and high-pressure injection devices. At present, the sealing performance of the one-way valve is poor, so that the hidden trouble of liquid backflow of the one-way valve is caused.
SUMMERY OF THE UTILITY MODEL
The main object of the utility model is to provide a medical check valve, aim at improving the leakproofness of medical check valve to improve the security performance of medical check valve.
In order to achieve the above object, the utility model provides a medical check valve, include:
the valve comprises a first valve body and a second valve body, wherein the first valve body comprises a butt joint seat, the butt joint seat is provided with a first accommodating groove, and the bottom wall of the first accommodating groove is provided with a first flow limiting hole and an arc-shaped flange arranged around the first flow limiting hole;
the second valve body comprises a connecting seat, the connecting seat is provided with a second containing groove, the bottom wall of the second containing groove is provided with a second flow limiting hole and a supporting piece which is arranged adjacent to the second flow limiting hole, a limiting step is formed at the position, adjacent to a notch, of the inner wall of the second containing groove, the connecting seat is connected with the butt joint seat so that the first containing groove and the second containing groove are enclosed to form a containing cavity, and the limiting step is matched with the arc-shaped flange to form a first limiting groove communicated with the containing cavity;
the sealing ring comprises an arc-shaped part and an abutting part connected with the arc-shaped part, the sealing ring is limited in the first limiting groove, the arc-shaped part abuts against the arc-shaped flange, and the abutting part abuts against the limiting step in a limiting manner;
the flow limiting piece is accommodated in the cavity, and when the first flow limiting hole feeds liquid, the flow limiting piece is abutted against the support piece so as to enable the cavity to be communicated with the second flow limiting hole; when the second flow limiting hole feeds liquid, the flow limiting piece is in sealing butt joint with the sealing ring, so that the containing cavity is separated from the first flow limiting hole.
Furthermore, the cross section of the sealing ring is arranged in a D shape;
and/or the sealing ring is made of silica gel.
Furthermore, the supporting piece is provided with a plurality of supporting pieces which surround the second flow limiting hole and are arranged evenly and at intervals.
Further, the first valve body further comprises a first sleeve, the first sleeve is connected to one side, back to the first containing groove notch, of the butt joint seat, and the first sleeve is communicated with the first limiting hole.
Furthermore, the first valve body further comprises a first connecting part arranged around the first sleeve, and an annular limiting groove is formed by matching the first connecting part with the side wall of the first sleeve;
threads are arranged on one side, facing the annular limiting groove, of the first connecting part; and/or one side of the first connecting part, which deviates from the annular limiting groove, is provided with a plurality of convex ribs which are uniformly arranged at intervals.
Furthermore, the connecting seat is provided with a limiting part adjacent to the notch of the second accommodating groove, the limiting part is arranged around the side wall of the second accommodating groove and is matched with the side wall of the second accommodating groove to form a second limiting groove, and the side wall of the first accommodating groove is limited in the second limiting groove.
Furthermore, the limiting part is provided with a clamping groove in a concave mode towards one side of the second limiting groove, the outer side wall of the first accommodating groove is provided with a clamping protrusion in a convex mode, and when the side wall of the first accommodating groove is limited in the second limiting groove, the clamping protrusion is clamped in the clamping groove.
Further, the second valve body further comprises a second sleeve, the second sleeve is connected to one side, facing away from the second accommodating groove notch, of the connecting seat, and the second sleeve is communicated with the second limiting hole.
Furthermore, a second connecting portion is arranged at one end, away from the connecting seat, of the second sleeve, and threads are arranged on the outer wall of the second connecting portion.
Further, the current-limiting piece is arranged in a spherical shape.
The sealing ring is limited in the first limiting groove formed by matching the limiting step and the arc-shaped flange, the arc-shaped part of the sealing ring is abutted against the arc-shaped flange of the first valve body, and the abutting part is abutted against the limiting step of the second valve body in a limiting manner, so that the sealing ring is prevented from loosening, and the fixing of the sealing ring is realized, and the sealing performance of the medical one-way valve is improved; furthermore, the first flow limiting hole and the second flow limiting hole of the medical check valve are communicated and separated by matching the flow limiting piece and the sealing ring. When the liquid medicine flows in from the first flow limiting hole, the flow limiting piece floats in the containing cavity or is abutted against the supporting piece, and the conduction of the medical one-way valve is realized; when liquid medicine flowed in from the second restricted flow hole, the restricted flow spare received backpressure under the punching press of liquid medicine to with the sealed butt of sealing washer, thereby realize that first restricted flow hole cuts off, avoid the backward flow of liquid medicine.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural view of an embodiment of the medical check valve of the present invention;
FIG. 2 is a cross-sectional view of the check valve of FIG. 1;
FIG. 3 is a schematic structural view of the second valve body of FIG. 1;
fig. 4 is a schematic structural view of the first valve body in fig. 1.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Medical one-way valve | 212 | Second flow restriction orifice |
| 1 | First valve body | 213 | Support piece |
| 11 | Butt-joint seat | 214 | Limiting step |
| 111 | First holding tank | 215 | Second limit groove |
| 112 | First flow restriction orifice | 216 | Limiting part |
| 113 | Arc flange | 23 | Second sleeve |
| 13 | First sleeve | 25 | Second connecting part |
| 15 | First connecting part | 3 | Containing chamber |
| 151 | Convex rib | 4 | Sealing ring |
| 16 | Annular limiting groove | 41 | Arc-shaped part |
| 2 | Second valve body | 43 | Abutting part |
| 21 | Connecting seat | 5 | Flow-limiting element |
| 211 | Second holding tank |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a medical check valve 100.
Referring to fig. 1 to 4, the medical check valve 100 includes:
the first valve body 1 comprises a butt joint seat 11, the butt joint seat 11 is provided with a first accommodating groove 111, and the bottom wall of the first accommodating groove 111 is provided with a first flow limiting hole 112 and an arc-shaped flange 113 arranged around the first flow limiting hole 112;
the second valve body 2 comprises a connecting seat 21, the connecting seat 21 is provided with a second accommodating groove 211, the bottom wall of the second accommodating groove 211 is provided with a second flow limiting hole 212 and a supporting piece 213 which is arranged adjacent to the second flow limiting hole 212, a limiting step 214 is formed at the position, adjacent to the notch, of the inner wall of the second accommodating groove 211, the connecting seat 21 is connected with the butting seat 11 so that the first accommodating groove 111 and the second accommodating groove 211 surround to form a containing cavity 3, and the limiting step 214 is matched with the arc-shaped flange 113 to form a first limiting groove communicated with the containing cavity 3;
the sealing ring 4 comprises an arc-shaped part 41 and an abutting part 43 connected with the arc-shaped part 41, the sealing ring 4 is limited in the first limiting groove, the arc-shaped part 41 abuts against the arc-shaped flange 113, and the abutting part 43 abuts against the limiting step 214 in a limiting manner;
a flow restrictor 5 accommodated in the chamber 3, wherein when the first orifice 112 is supplied with liquid, the flow restrictor 5 abuts against the support 213 to connect the chamber 3 to the second orifice 212; when the second orifice 212 is fed, the restrictor 5 is in sealing contact with the gasket 4 to block the chamber 3 from the first orifice 112.
In this embodiment, the limiting step 214 is matched with the arc-shaped flange 113 to form a first limiting groove communicating with the cavity 3, so that the sealing ring 4 is limited in the first limiting groove and protrudes out of the arc-shaped flange 113, and the current limiting member 5 is abutted against the sealing ring 4 to realize sealing. In addition, the first valve body 1 and the second valve body 2 can be made of rubber, so that the medical check valve 100 is convenient to form and low in density, and the weight of the medical check valve 100 is favorably reduced.
The utility model discloses technical scheme is through spacing sealing washer 4 in first spacing inslot to the arc portion 41 of sealing washer 4 and the 113 butts of arc flange of first valve body 1, the spacing butt of butt portion 43 and the spacing step 214 of second valve body 2 prevent that removal from appearing in sealing washer 4, realize the fixed of sealing washer 4, thereby increase medical check valve 100's leakproofness. Further, the first flow restriction hole 112 and the second flow restriction hole 212 of the medical check valve 100 are communicated and blocked by the cooperation of the flow restriction member 5 and the sealing ring 4. When the medical fluid flows in from the first orifice 112, the flow restrictor 5 moves toward the second orifice 212 under the action of the medical fluid and abuts against the support 213, and the support 213 prevents the flow restrictor 5 from abutting against the periphery of the second orifice 212, so that the medical check valve 100 can pass through the second orifice 212, thereby achieving the conduction. When the liquid medicine flows in from the second flow restriction hole 212, the flow restriction member 5 is in sealing contact with the sealing ring 4 under the punching of the liquid medicine, so that the first flow restriction hole 112 is blocked, and the liquid medicine is prevented from flowing back.
Referring to fig. 1, the cross section of the sealing ring 4 is D-shaped.
In this embodiment, the cross section of the sealing ring 4 is arranged in a "D" shape, the arc-shaped portion 41 of the "D" shape abuts against the arc-shaped flange 113 of the first valve body 1, and the abutting portion 43 abuts against the limiting sleeve of the inner wall of the second valve body 2, so that the sealing ring 4 is firmly limited in the first limiting groove, and the sealing performance of the medical check valve 100 is prevented from being affected by the movement of the sealing ring 4.
Further, the material of the sealing ring 4 is silica gel.
Specifically, the material of the sealing ring 4 may be a plastic material, preferably silica gel, which has stable chemical properties and is easy to machine and mold. Importantly, the silicone rubber has good elasticity and can deform under the extrusion of the flow restriction member 5, so that the silicone rubber can be tightly attached to the flow restriction member 5 to block the first flow restriction hole 112 and prevent the liquid from flowing back.
Preferably, the supporting member 213 is provided in plurality, and the plurality of supporting members 213 are uniformly and spaced around the second restriction hole 212.
In the present embodiment, the plurality of supporting members 213 are uniformly and intermittently disposed around the second flow restriction hole 212, so that the flow restriction member 5 is uniformly supported, and the flow restriction member 5 is prevented from tilting under the impact of the liquid medicine, thereby affecting the flow of the liquid. It will be appreciated that the liquid medicine enters the chamber 3 through the first flow restriction hole 112 and passes through the second flow restriction hole 212 from the gap between the adjacent two of the support members 213. It should be noted that the axial width of the support member 213 along the second flow restriction hole 212 is not too large, so as to prevent the accumulation of the liquid medicine from affecting the infusion effect.
Referring to fig. 2 and 4, the first valve body 1 further includes a first sleeve 13, the first sleeve 13 is connected to a side of the docking seat 11 facing away from the notch of the first receiving groove 111, and the first sleeve 13 is communicated with the first flow-limiting hole 112.
In the present embodiment, the first valve body 1 further comprises a first sleeve 13 communicated with the first flow restriction hole 112 to connect the first valve body 1 with an infusion set or an infusion tube. The liquid enters the cavity 3 through the first sleeve 13 and the first flow restriction hole 112, so that the medical check valve 100 is conducted.
Referring to fig. 4, the first valve body 1 further includes a first connecting portion 15 disposed around the first sleeve 13, and the first connecting portion 15 and a sidewall of the first sleeve 13 cooperate to form an annular limiting groove 16.
In this embodiment, the first valve body 1 is connected to the infusion tube through the annular limiting groove 16, so that the first valve body 1 can be conveniently connected to the infusion tube, and the first valve body is simple in structure and convenient to connect. The length of the first connecting portion 15 can be slightly less than the length of the first sleeve 13, so that the free end of the first sleeve 13 protrudes out of the annular limiting groove 16, and the first sleeve 13 is conveniently connected with an external infusion tube.
With continued reference to fig. 2 and 4, the first connecting portion 15 has threads on a side facing the annular limiting groove 16.
Furthermore, the first connecting part 15 is provided with threads, and the end part of the infusion tube can be connected with the first connecting part 15 through the threads, so that the connection firmness is improved.
Referring to fig. 1, a plurality of ribs 151 are disposed at regular intervals on a side of the first connecting portion 15 away from the annular limiting groove 16.
Preferably, a plurality of ribs 151 are protruded from the outer surface of the first connecting portion 15, and the ribs 151 may increase the strength of the first connecting portion 15. The plurality of ribs 151 may be distributed on the outer surface of the first connection portion 15 in an evenly spaced manner, so that the structural strength of the first connection portion 15 in each direction is equal, and the stability is improved. In addition, the convex rib 151 can increase the surface friction force, thereby facilitating the communication between the first valve body 1 and the external infusion tube.
Referring to fig. 2 and 3, the connecting seat 21 is provided with a limiting portion 216 adjacent to the notch of the second receiving groove 211, the limiting portion 216 is disposed around the sidewall of the second receiving groove 211 and forms a second limiting groove 215 in cooperation with the sidewall of the second receiving groove 211, and the sidewall of the first receiving groove 111 is limited in the second limiting groove 215.
In this embodiment, the sidewall of the first receiving groove 111 is limited in the second limiting groove 215, so that the connection between the connecting seat 21 and the docking seat 11 is achieved. The side wall of the first receiving groove 111 can be in interference fit with the second limiting groove 215, so that the overall structure is more stable.
In addition, the lateral wall of first holding tank 111 is spacing in second spacing groove 215, realizes connecting seat 21 and the preliminary location back of butt joint seat 11, can also make the lateral wall fixed connection of first holding tank 111 and second holding tank 211 through ultrasonic bonding, makes connecting seat 21 and butt joint seat 11 be connected more firmly, increases medical check valve 100's leakproofness. The arrangement of the second limiting groove 215 not only increases the sealing performance of the whole structure, but also facilitates the welding of the butt joint seat 11 and the connecting seat 21. Of course, the connection seat 21 and the docking seat 11 may be fixedly connected by other connection methods, which are not limited herein.
Further, a clamping groove (not shown) is concavely formed on one side of the limiting portion 216 facing the second limiting groove 215, a protruding portion (not shown) is convexly formed on the outer side wall of the first accommodating groove 111, and when the side wall of the first accommodating groove 111 is limited in the second limiting groove 215, the protruding portion is clamped in the clamping groove.
In a preferred embodiment, the periphery of the outer side wall of the first accommodating groove 111 is provided with a plurality of protruding clips, the inner side wall of the limiting portion 216 is provided with a plurality of corresponding clamping grooves, the clamping strength is increased, the stability of the whole structure is improved, the plurality of protruding clips and the clamping grooves are arranged at uniform intervals, the structural strength in all directions is equal, and the stability is further improved. The locking protrusion may be cylindrical, ridged or wedged, and the locking protrusion may be inserted into the locking groove to realize the engagement between the docking seat 11 and the connection seat 21.
Referring to fig. 2 and 3, the second valve body 2 further includes a second sleeve 23, the second sleeve 23 is connected to a side of the connecting seat 21 facing away from the notch of the second receiving groove 211, and the second sleeve 23 is communicated with the second flow restriction hole 212.
In this embodiment, the second cannula 23 is provided to facilitate connection of the second valve body 2 to the infusion line. The medical liquid flows into the second sleeve 23 through the second flow restriction hole 212, and the medical check valve 100 is conducted in one direction.
Further, one end of the second sleeve 23 departing from the connecting seat 21 is provided with a second connecting portion 25, and the outer wall of the second connecting portion 25 is provided with threads.
In this embodiment, the free end of the second sleeve 23 is provided with a second connection portion 25, and the threads on the outer wall of the second connection portion 25 further facilitate the connection of the second valve body 2 with the infusion tube or the multi-way connector.
Referring to fig. 2, the flow restriction 5 is disposed in a ball shape.
In this embodiment, the flow restrictor 5 is provided in a spherical shape, and the surface of the flow restrictor 5 is attached to the arc portion 41 of the sealing ring 4, thereby sealing the medical check valve 100. Of course, the shape of the restrictor 5 may be spherical or tapered, as long as the restrictor 5 abuts against the peripheral edge of the seal ring 4 to close the first restrictor hole 112.
Further, the material of the flow restrictor 5 is metal.
Specifically, the material of the flow restriction 5 is metal, so that the weight of the flow restriction 5 is increased, the sealing ring 4 deforms under the pressure of the flow restriction 5, the flow restriction 5 and the periphery of the sealing ring 4 are attached more tightly, and the sealing performance of the medical check valve 100 is increased. Of course, the material of the flow restrictor 5 may also be plastic.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A medical check valve, comprising:
the valve comprises a first valve body and a second valve body, wherein the first valve body comprises a butt joint seat, the butt joint seat is provided with a first accommodating groove, and the bottom wall of the first accommodating groove is provided with a first flow limiting hole and an arc-shaped flange arranged around the first flow limiting hole;
the second valve body comprises a connecting seat, the connecting seat is provided with a second containing groove, the bottom wall of the second containing groove is provided with a second flow limiting hole and a supporting piece which is arranged adjacent to the second flow limiting hole, a limiting step is formed at the position, adjacent to a notch, of the inner wall of the second containing groove, the connecting seat is connected with the butt joint seat so that the first containing groove and the second containing groove are enclosed to form a containing cavity, and the limiting step is matched with the arc-shaped flange to form a first limiting groove communicated with the containing cavity;
the sealing ring comprises an arc-shaped part and an abutting part connected with the arc-shaped part, the sealing ring is limited in the first limiting groove, the arc-shaped part abuts against the arc-shaped flange, and the abutting part abuts against the limiting step in a limiting manner;
the flow limiting piece is accommodated in the accommodating cavity, and when the first flow limiting hole feeds liquid, the flow limiting piece floats in the accommodating cavity or is abutted against the support piece so as to enable the accommodating cavity to be communicated with the second flow limiting hole; when the second flow limiting hole feeds liquid, the flow limiting piece is in sealing butt joint with the sealing ring, so that the containing cavity is separated from the first flow limiting hole.
2. The medical check valve as claimed in claim 1, wherein the cross section of said sealing ring is arranged in a "D" shape;
and/or the sealing ring is made of silica gel.
3. The medical check valve as claimed in claim 1, wherein said support member is provided in plurality, and said plurality of support members are evenly and spaced around said second flow restriction orifice.
4. The medical check valve as recited in claim 1, wherein said first valve body further comprises a first sleeve, said first sleeve is connected to a side of said docking station facing away from said first receiving groove notch, and said first sleeve is in communication with said first restricted orifice.
5. The medical check valve as claimed in claim 4, wherein the first valve body further comprises a first connecting portion disposed around the first sleeve, the first connecting portion cooperating with a sidewall of the first sleeve to form an annular limiting groove;
threads are arranged on one side, facing the annular limiting groove, of the first connecting part; and/or one side of the first connecting part, which deviates from the annular limiting groove, is provided with a plurality of convex ribs which are uniformly arranged at intervals.
6. The medical check valve as claimed in any one of claims 1 to 5, wherein the connecting seat is provided with a limiting portion adjacent to the notch of the second receiving groove, the limiting portion is disposed around the sidewall of the second receiving groove and forms a second limiting groove in cooperation with the sidewall of the second receiving groove, and the sidewall of the first receiving groove is limited in the second limiting groove.
7. The medical check valve as claimed in claim 6, wherein a side of the limiting portion facing the second limiting groove is concavely provided with a locking groove, an outer side wall of the first receiving groove is convexly provided with a locking protrusion, and when the side wall of the first receiving groove is limited in the second limiting groove, the locking protrusion is locked in the locking groove.
8. The medical check valve as claimed in claim 6, wherein the second valve body further comprises a second sleeve connected to a side of the connection seat facing away from the second receiving groove notch, and the second sleeve communicates with the second flow restriction hole.
9. The medical check valve as claimed in claim 8, wherein an end of the second sleeve facing away from the connecting seat is provided with a second connecting portion, and an outer wall of the second connecting portion is provided with a screw thread.
10. The medical check valve as claimed in claim 1, wherein said restriction is spherically shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920508580.3U CN209827972U (en) | 2019-04-12 | 2019-04-12 | Medical one-way valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920508580.3U CN209827972U (en) | 2019-04-12 | 2019-04-12 | Medical one-way valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209827972U true CN209827972U (en) | 2019-12-24 |
Family
ID=68912034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920508580.3U Active CN209827972U (en) | 2019-04-12 | 2019-04-12 | Medical one-way valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209827972U (en) |
-
2019
- 2019-04-12 CN CN201920508580.3U patent/CN209827972U/en active Active
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