CN104888310B - Blood return prevention infusion joint - Google Patents
Blood return prevention infusion joint Download PDFInfo
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- CN104888310B CN104888310B CN201510344281.7A CN201510344281A CN104888310B CN 104888310 B CN104888310 B CN 104888310B CN 201510344281 A CN201510344281 A CN 201510344281A CN 104888310 B CN104888310 B CN 104888310B
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Abstract
The invention provides a blood return prevention infusion joint which comprises an outer joint, an inner joint seat and an elastic blocking sheet, wherein the outer joint is connected with the inner joint seat in a sealing mode, the elastic blocking sheet is arranged between a liquid inlet of the outer joint and a liquid outlet of the inner joint seat, the periphery of the elastic blocking sheet is connected with the inner wall of the liquid inlet, the elastic blocking sheet is provided with a sealing part and a liquid through port, and the sealing part covers the liquid outlet of the inner joint seat. The blood return prevention transfusion connector fixes the elastic blocking sheet for the first time, and realizes one-way circulation of liquid medicine only by means of self deformation of the elastic blocking sheet, so that blood return can be prevented even when the hydraulic pressure is equal to the human body venous pressure or the pressure difference between the hydraulic pressure and the human body venous pressure is small, the problem that the blood return prevention transfusion connector in the prior art cannot really play a blood return prevention effect is effectively solved, and therefore a transfusion person cannot generate a blood return phenomenon even walking or lifting an arm randomly in a transfusion process, and clinical application is facilitated.
Description
Technical Field
The invention relates to a disposable medical instrument, in particular to an infusion joint with a blood return prevention function, and belongs to the field of medical instruments.
Technical Field
At present, the infusion apparatus used for intravenous infusion in various medical institutions in China is usually a disposable infusion apparatus which is a medical consumable material which is subjected to sterile treatment and is used for establishing a channel between a vein and liquid medicine. The existing ordinary transfusion system is generally composed of a needle head (such as a disposable intravenous transfusion needle, a venous indwelling needle and the like), a protective cap, a transfusion hose, a liquid medicine filter, a flow rate regulator, a Murphy's dropper, a bottle stopper puncture outfit, an air inlet pipe air filter and the like which are connected, is mainly used for clinical gravity type transfusion, and plays a positive role in preventing cross infection in the transfusion process.
In clinical use, a medical worker inserts a bottle plug puncture outfit of an infusion apparatus into an infusion bottle, the infusion bottle is hung on an infusion rod, exhaust is carried out, the whole infusion hose is filled with liquid medicine, then the flow rate regulator is closed, venipuncture can be carried out, the flow rate regulator can be opened after needle puncture is fixed, the dropping speed is adjusted to carry out infusion, the liquid medicine flows into a Murphy's dropper along the infusion hose under the action of atmospheric pressure, and when the pressure of a water column in the Murphy's dropper is greater than the venous pressure, the liquid in the infusion bottle flows into veins along the infusion hose. However, during the infusion process or when a small amount of liquid medicine remains in the infusion hose or when the infusion is finished or stopped, since the pressure of the water column is lower than the venous pressure, if the flow rate regulator is not closed or the needle is pulled out in time, the venous blood of the patient flows back into the infusion hose, and an unexpected blood return phenomenon occurs. Once blood returns, the patient is frightened, worry and unease are caused, and the infusion hose cannot continue infusion due to air bubble embolism if the blood returns. Therefore, how to effectively solve the problem and the adverse effects thereof in the clinical treatment process is a problem which is still troublesome in the industry.
Therefore, many researches are devoted to developing infusion sets with blood return prevention functions, for example, chinese patent document CN203169710U discloses a blood return prevention device, which includes a blood return prevention connector upper cover, a silicone sheet, and a blood return prevention connector base, the blood return prevention connector upper cover is fixedly connected with the blood return prevention connector base, a cavity is formed at the joint of the blood return prevention connector upper cover and the blood return prevention connector base, the silicone sheet is arranged in the cavity, the silicone sheet is in a cylindrical shape, the bottom of the silicone sheet is close to the blood return prevention connector upper cover, an opening of the silicone sheet is close to the blood return prevention connector base, and a circle of first protrusions is arranged at the bottom of the silicone sheet. In the process of transfusion, the silica gel sheet moves towards the blood return prevention joint base in the cavity under the pressure of the liquid medicine, the first bulge is separated from the upper cover of the blood return prevention joint, the opening part of the silica gel sheet lightly touches the blood return prevention joint base, and the liquid medicine can flow into a catheter connected with the blood return prevention joint base from a contact gap between the opening part and the blood return prevention joint base; when the infusion is completed, the silica gel sheet is pushed upwards by the pressure inside the human body, the silica gel sheet moves upwards, the first bulge and the upper cover of the blood return prevention connector are tightly attached together, and the structure can prevent air from entering so as to play a blood return prevention function.
Obviously, the above-mentioned technique relies on the reciprocating of cask form silica gel piece in the cavity that joint upper cover and base enclose and close just to realize the liquid medicine circulation and block the function of blood, because the silica gel piece is movable in above-mentioned cavity, and not fixed setting, can make the pressure of water column in the Murphy's dropper equal with venous pressure or when the pressure differential of the two is less like this, the silica gel piece all will move to the middle part of cavity, neither laminate with the joint upper cover, also do not contradict with the joint base, the silica gel piece at this moment just can't block the backward flow of blood, thereby lead to preventing in this technique blood return device can not effectively play the effect of preventing blood return. In view of this, how to improve the structure of the blood return prevention transfusion connector in the prior art to overcome the above-mentioned defects is an unsolved technical problem in the field.
Disclosure of Invention
The invention solves the problem that the blood return prevention function cannot be effectively realized in the blood return prevention transfusion connector in the prior art, and further provides the blood return prevention transfusion connector which can effectively prevent blood from returning and has a simpler structure.
The technical scheme for realizing the aim of the invention is as follows:
an anti-blood return transfusion joint comprises an outer joint and an inner connecting seat, wherein the outer joint is hermetically connected with the inner connecting seat,
the elastic barrier sheet is provided with a sealing part and a liquid through opening;
the sealing part covers the liquid outlet of the inner connecting seat to limit the flow of liquid at the liquid outlet;
the elastic blocking piece is arranged between the liquid inlet of the outer joint and the liquid outlet of the inner connecting seat, and the periphery of the elastic blocking piece is connected with the inner wall of the liquid inlet.
Further, the projection of the liquid outlet of the inner connecting seat on the elastic blocking sheet is located in the closed part, so that the closed part is not smaller than the liquid outlet.
Preferably, the closed part is arranged in the middle of the elastic barrier sheet, and the liquid through port is arranged around the closed part.
Further, a first liquid medicine channel is arranged in the inner connecting seat and comprises a liquid conveying section and a reducing section, and the caliber of the reducing section is gradually reduced along the flowing direction of the liquid medicine to form the liquid outlet.
Preferably, the cross section of the necking section is circular or is a closed curve formed by two parallel line segments and two arcs connecting end points on the same side of the two line segments, and the line segments and the arcs are connected end to form the closed curve.
Preferably, the medical liquid medicine injection device further comprises an exhaust port, the exhaust port is arranged on the outer wall surface of the movable plug, the movable plug is embedded on the side wall of the first liquid medicine channel, and a water-blocking air filtering membrane is arranged in the movable plug.
Preferably, an annular boss is further formed around the periphery of the necking section, a liquid return space is formed between the inner wall of the annular boss and the outer wall surface of the necking section, and the liquid return space corresponds to the liquid through port of the elastic blocking sheet.
Preferably, a second liquid medicine channel is arranged in the outer joint, the second liquid medicine channel is divided into a liquid inlet section and a conveying section, the caliber of the liquid inlet section is gradually reduced along the liquid medicine flowing direction, and the inlet of the liquid inlet section is a liquid inlet of the outer joint.
Preferably, a fixing member is disposed at a periphery of the elastic blocking sheet, and is adapted to fix the elastic blocking sheet between the liquid outlet of the inner joint seat and the liquid inlet of the outer joint.
Preferably, the fixing piece is a circular truncated cone, the circular truncated cone is arranged above the annular boss, the peripheral wall surface of the circular truncated cone is attached to the inner wall surface of the liquid inlet section of the outer joint, a third liquid medicine channel is arranged on the upper surface and the lower surface of the circular truncated cone in a penetrating mode, and the periphery of the elastic blocking piece is fixed to the inner wall surface of the third liquid medicine channel.
The invention relates to a blood return prevention infusion joint, wherein an outer joint is hermetically connected with an inner connecting seat, and an elastic blocking sheet with a sealing part and a liquid through port is arranged between a liquid inlet of the outer joint and a liquid outlet of the inner connecting seat, so that the periphery of the elastic blocking sheet is connected with the inner wall of the liquid inlet of the outer joint, and the sealing part covers the liquid outlet of the inner connecting seat; can form hydraulic pressure after being filled with the liquid medicine in the hose of transfusion system like this, force elastic separation piece to take place deformation and keep away from the liquid outlet of internal connection seat, thereby form the infusion route in order to realize the liquid medicine to human flow, along with the going on of infusion, when hydraulic pressure equals or is less than human vein pressure, a small amount of blood backward flow makes elastic separation piece resume deformation and plugs up the liquid outlet of internal connection seat, in the hose of transfusion system is flowed back to in order effectively to prevent blood, thereby can avoid the emergence of unexpected blood return phenomenon.
Compared with the blood return prevention transfusion connector in the prior art, the blood return prevention transfusion connector has the following advantages:
(1) the blood return prevention infusion joint fixes an elastic blocking sheet which allows liquid medicine to pass through but prevents blood from flowing back between the liquid inlet of the outer joint and the liquid outlet of the inner joint for the first time, and can realize one-way circulation of the liquid medicine only by means of elastic deformation of the elastic blocking sheet.
(2) The blood return prevention infusion joint can realize one-way circulation of liquid medicine and prevent blood from returning by only connecting the periphery of the elastic blocking piece with the inner wall of the liquid inlet of the external joint and enabling the sealing part of the elastic blocking piece to cover the liquid outlet of the internal joint seat, and utilizing the matching action between the elastic blocking piece and the wall surface of the liquid outlet, so that the blood return prevention infusion joint has a simpler structure and is easier to process and manufacture compared with the infusion joint in the prior art.
(3) The blood return prevention transfusion joint is characterized in that a first liquid medicine channel with a liquid conveying section and a necking section is arranged in an inner connecting seat of the transfusion joint, and the caliber of the necking section is gradually reduced along the flowing direction of the liquid medicine to form a liquid outlet of the inner connecting seat, so that the flow speed of the liquid medicine is increased due to the narrowing of the caliber of the first liquid medicine channel when the liquid medicine reaches an elastic blocking piece, the elastic blocking piece can be more powerfully forced to deform along the flowing direction of the liquid medicine and to be far away from the liquid outlet of the inner connecting seat, and the liquid medicine can flow to a human body from a liquid through port formed in the elastic blocking piece so as to realize the circulation of the liquid medicine.
(4) According to the blood return prevention infusion joint, the movable plug is embedded in the side wall of the first liquid medicine channel, the air outlet is formed in the outer wall surface of the movable plug, the water-blocking air filtering membrane is arranged in the movable plug, so that the infusion joint also has an air exhaust function, once air is mixed in an infusion pipeline, the air bubbles automatically escape from the air outlet when the liquid medicine flows through the infusion joint, the situation that the air enters a human body is effectively avoided, and meanwhile, the air exhaust operation in the infusion process is greatly simplified.
(5) The blood return prevention infusion joint is characterized in that an annular boss is arranged on the periphery of a necking section surrounding a first liquid medicine channel, so that a liquid return space is formed between the inner wall of the annular boss and the outer wall surface of the necking section, and corresponds to a liquid through port of an elastic blocking sheet; so set up and make elastic separation piece only with the wall contact of inner pedestal liquid outlet, be favorable to keeping the surface smoothness of elastic separation piece to ensure that the confined part of elastic separation piece can closely laminate with the wall of inner pedestal liquid outlet when having a small amount of blood backward flow, in order to reach better and prevent back blood effect.
(6) According to the blood return prevention infusion joint, the fixing piece is arranged on the periphery of the elastic blocking piece, the fixing piece is preferably a circular truncated cone which is arranged above the annular boss, the peripheral wall surface of the circular truncated cone is attached to the inner wall surface of the liquid inlet section of the outer joint, the third liquid medicine channel is arranged on the upper surface and the lower surface of the circular truncated cone in a penetrating mode, and the periphery of the elastic blocking piece is fixed to the inner wall surface of the third liquid medicine channel, so that the elastic blocking piece can be attached to the liquid outlet of the inner joint more tightly, the elastic blocking piece can be fixed between the liquid inlet of the outer joint and the liquid outlet of the inner joint more firmly, and the blood return prevention effect of the elastic blocking piece is enhanced.
(7) The external joint and the internal joint of the transfusion joint for preventing blood return can be standard 6∶100 taper joint, can also be 6∶100 screw joints, so that the inner socket can be connected with the liquid medicine filter and can also be connected with the liquid medicine filterThe two ends with the conical heads are connected; the external connector can be directly used for replacing an infusion needle seat and bonded with a thin hose of an infusion needle, and can also be connected to the thin hose of the infusion needle or assembled on a three-way seat of a venous indwelling needle, so that the infusion connector has universality and can be directly assembled in various functional infusion devices such as a precise filtering infusion device, a bag type infusion device, a burette type infusion device, an automatic stopping infusion device, an automatic exhaust infusion device and the like and a central venous catheter.
Drawings
FIG. 1 is a cross-sectional view of one embodiment of a blood return prevention infusion connector of the present invention;
FIG. 2 is a diagram of the structure of one embodiment of the elastic barrier in the blood return prevention infusion connector of the present invention;
FIG. 3 is a block diagram of another embodiment of an elastic barrier in a blood return prevention infusion connector according to the present invention;
FIG. 4 is a cross-sectional structural view of another embodiment of the blood return prevention infusion connector of the present invention;
wherein the reference numerals are as follows:
10-an external joint; 11-a liquid inlet; 12-a second medical fluid channel; 13-a liquid inlet section; 14-a conveying section; 20-inner connecting seat; 21-a liquid outlet; 22-a first medical fluid channel; 23-a liquid delivery section; 24-a necking section; 25-a buffer section; 26-an annular boss; 30-an elastic barrier sheet; 31-a closure; 32-liquid through port; 33-a fixing member; 40-an exhaust port; 41-water-resistant air filtration membrane; 42-Movable stopper.
Detailed Description
The blood return prevention infusion joint provided by the invention is explained in detail by combining specific embodiments.
The blood return prevention infusion joint of this embodiment, as shown in fig. 1, includes an outer joint 10, an inner socket 20 and an elastic blocking sheet 30, wherein the outer joint 10 is hermetically connected to the inner socket 20, the elastic blocking sheet 30 is disposed between a liquid inlet 11 of the outer joint 10 and a liquid outlet 21 of the inner socket 20, and a periphery of the elastic blocking sheet is connected to an inner wall surface of the liquid inlet 11; the elastic blocking piece 30 has a closed portion 31 and a liquid through port 32, and the closed portion 31 covers the liquid outlet 21 of the inner seat 20 to limit the flow of the liquid at the liquid outlet 21. The elastic barrier sheet 30 in this embodiment may be made of silicone so that it has good elasticity.
The blood return prevention infusion connector of this embodiment in the use, can form hydraulic pressure after being filled with the liquid medicine in the hose of transfusion system, force elastic separation piece 30 to take place the deformation and keep away from the liquid outlet 21 of internal connection seat 20, thereby form the infusion route in order to realize the liquid medicine to human flow, along with the going on of infusion, when hydraulic pressure equals or is less than human venous pressure, a small amount of blood backward flow makes elastic separation piece 30 resume the deformation and seal up the liquid outlet 21 of internal connection seat 20, in order effectively to prevent in the hose of blood backward flow to the transfusion system, thereby can avoid the emergence of unexpected blood return phenomenon, even if make the infusion person walk about at will or raise the arm at will and also can not appear the blood return phenomenon at the infusion in-process, the clinical use of being convenient for very much. In this embodiment, the projection of the liquid outlet 21 of the inner connecting seat 20 on the elastic blocking sheet 30 is located in the closed portion 31, so that the closed portion 31 is not smaller than the liquid outlet 21, and the closed portion 31 of the elastic blocking sheet 30 can be more closely attached to the liquid outlet 21 of the inner connecting seat 20, so that the blood return prevention infusion connector of this embodiment has a better blood return prevention effect.
As a preferred embodiment, the blood return prevention infusion connector of the present embodiment is provided with a first medical fluid channel 22 in the internal seat 20, the first medical fluid channel 22 includes a fluid conveying section 23 and a necking section 24, and the caliber of the necking section 24 gradually decreases in the medical fluid flowing direction to form the fluid outlet 21; therefore, when the liquid medicine reaches the elastic blocking piece, the aperture of the first liquid medicine channel 22 is narrowed to increase the flow velocity thereof, so that the elastic blocking piece 30 can be more forcefully forced to deform along the flow direction of the liquid medicine and to be away from the liquid outlet 21 of the inner connecting seat 20, and the liquid medicine can flow to the human body from the liquid through port 32 formed on the elastic blocking piece 30, so as to realize the circulation of the liquid medicine.
The cross section of the necking section 24 in this embodiment may be circular, or may be a closed curve formed by two parallel line segments and two arcs connecting the end points on the same side of the two line segments, and the line segments and the arcs are connected end to form the closed curve. Correspondingly, referring to fig. 2 and fig. 3, the shape of the elastic blocking sheet 30 in this embodiment is matched with the shape of the cross section of the necking section 24, the closing portion 31 is disposed at the middle of the elastic blocking sheet 30, the liquid through port 32 is disposed around the closing portion 31, and the shape of the liquid through port 32 may be a hole shape or a linear shape.
Further, in order to make the liquid medicine flow from the inner socket to the outer connector more smoothly, as shown in fig. 4, the first liquid medicine channel 22 of the blood return prevention infusion connector of the present embodiment is further provided with a buffer section 25 with an equal diameter, an inlet of the buffer section 25 is connected with an outlet of the reducer section 24, and a cross-sectional shape of the buffer section 25 is consistent with a cross-sectional shape of an outlet of the reducer section 24.
As a variant, the blood-return-preventing infusion connector of the present embodiment further has an annular boss 26 around the periphery of the constricted section 24, and a liquid-return space is formed between the inner wall of the annular boss 26 and the outer wall surface of the constricted section 24, and the liquid-return space corresponds to the liquid-through port 32 of the elastic barrier sheet 30; therefore, the elastic blocking piece 30 is only contacted with the wall surface of the liquid outlet 21 of the inner base 20, which is beneficial to maintaining the surface flatness of the elastic blocking piece, thereby ensuring that the sealing part 31 of the elastic blocking piece 30 can be tightly attached to the wall surface of the liquid outlet 21 of the inner base 20 when a small amount of blood flows back, and better achieving the effect of preventing blood from flowing back.
In a more preferred embodiment, a second medical fluid channel 12 is disposed in the external joint 10, the second medical fluid channel 12 is divided into a fluid inlet section 13 and a delivery section 14, the diameter of the fluid inlet section 13 gradually decreases along the medical fluid flowing direction, and the inlet of the fluid inlet section 13 is the fluid inlet 11 of the external joint 10.
Further preferably, in order to enable the elastic blocking plate 30 to be closely attached to the liquid outlet 21 of the inner socket 20, in this embodiment, a fixing member 33 is further disposed on the periphery of the elastic blocking plate 30, so as to fix the elastic blocking plate 30 between the liquid outlet 21 of the inner socket 20 and the liquid inlet 11 of the outer joint 10 more firmly, thereby facilitating to enhance the blood return prevention effect of the elastic blocking plate. In this embodiment, the fixing member 33 may be a circular truncated cone disposed above the annular boss 26, an outer peripheral wall surface of the circular truncated cone is attached to an inner wall surface of the liquid inlet section 13 of the outer joint 10, a third liquid medicine passage is disposed through upper and lower surfaces of the circular truncated cone, and a periphery of the elastic blocking piece 30 is fixed to any position of the inner wall surface of the third liquid medicine passage.
As an alternative embodiment, the blood return prevention infusion connector of the present embodiment further includes an air outlet 40, the air outlet 40 is disposed on an outer wall surface of a movable plug 42, the movable plug 42 is embedded on a side wall of the first medical fluid channel 22, and a water-blocking air filtering membrane 41 is disposed in the movable plug 42, so that the infusion connector of the present embodiment also has an air exhaust function, once air is mixed in an infusion pipeline, the air bubbles automatically escape from the air outlet when the medical fluid flows through the infusion connector of the present invention, thereby effectively avoiding the occurrence of air entering a human body, and greatly simplifying an air exhaust operation during an infusion process.
In addition, the external connector 10 and the internal connector 20 in this embodiment may be standard 6: 100 conical connectors or 6: 100 spiral connectors, so that the internal connector 20 may be connected to a medical fluid filter or a two-way connector with a conical head, and the external connector 10 may be directly used in place of an infusion needle seat and bonded to a thin hose of an infusion needle, or connected to a thin hose of an infusion needle or assembled to a three-way seat of a venous indwelling needle, and thus, the infusion connector described in this embodiment has universality and can be directly assembled in various functional infusion sets such as a precision filtration infusion set, a bag-type infusion set, a burette-type infusion set, an automatic stop infusion set, an automatic exhaust infusion set, and a central venous catheter.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (7)
1. An anti-blood return transfusion joint comprises an outer joint (10) and an inner connecting seat (20), wherein the outer joint (10) is hermetically connected with the inner connecting seat (20),
it is characterized by also comprising an elastic blocking sheet (30) provided with a sealing part (31) and a liquid through opening (32);
the closing part (31) covers the liquid outlet (21) of the inner connecting seat (20) to limit the flow of liquid at the liquid outlet (21);
the elastic blocking sheet (30) is arranged between the liquid inlet (11) of the outer joint (10) and the liquid outlet (21) of the inner connecting seat (20), and the periphery of the elastic blocking sheet is connected with the inner wall of the liquid inlet (11);
a first liquid medicine channel (22) is arranged in the inner connecting seat (20), the first liquid medicine channel (22) comprises a liquid conveying section (23) and a necking section (24), and the caliber of the necking section (24) is gradually reduced along the flowing direction of liquid medicine to form the liquid outlet (21);
the cross section of the necking section (24) is a closed curve formed by two parallel line segments and two arcs connecting the end points on the same side of the two line segments, and the line segments and the arcs are connected end to form the closed curve;
the shape of the closure (31) of the elastic barrier panel (30) is matched with the shape of the cross section of the necking section (24); the liquid passing port (32) is in a hole shape or a linear shape;
the projection of the liquid outlet (21) of the inner connecting seat (20) on the elastic blocking sheet (30) is positioned in the closed part (31), so that the closed part (31) is not smaller than the liquid outlet (21).
2. The anti-flashback infusion connector according to claim 1, wherein the closing portion (31) is disposed in a middle portion of the elastic barrier sheet (30), and the liquid passage port (32) is disposed around the closing portion (31).
3. The blood return prevention infusion joint according to claim 1, further comprising an exhaust port (40), wherein the exhaust port (40) is arranged on an outer wall surface of a movable plug (42), the movable plug (42) is embedded on a side wall of the first liquid medicine channel (22), and a water-blocking air filtering membrane (41) is arranged in the movable plug (42).
4. The anti-blood-return infusion connector according to claim 1, wherein an annular boss (26) is further formed around the periphery of the constriction section (24), and a liquid return space is formed between the inner wall of the annular boss (26) and the outer wall surface of the constriction section (24), and corresponds to the liquid through port (32) of the elastic barrier sheet (30).
5. The blood return prevention infusion joint according to claim 1, wherein a second liquid medicine channel (12) is arranged in the outer joint (10), the second liquid medicine channel (12) is divided into a liquid inlet section (13) and a conveying section (14), the caliber of the liquid inlet section (13) is gradually reduced along the flowing direction of the liquid medicine, and the inlet of the liquid inlet section (13) is a liquid inlet (11) of the outer joint (10).
6. The anti-blood-return infusion joint according to claim 4, wherein a fixing member (33) is disposed at the periphery of the elastic blocking sheet (30) and adapted to fix the elastic blocking sheet (30) between the liquid outlet (21) of the inner joint seat (20) and the liquid inlet (11) of the outer joint (10).
7. The blood return prevention infusion joint according to claim 6, wherein the fixing member (33) is a circular truncated cone, the circular truncated cone is arranged above the annular boss (26), the peripheral wall surface of the circular truncated cone is attached to the inner wall surface of the liquid inlet section (13) of the outer joint (10), a third liquid medicine channel is arranged to penetrate through the upper surface and the lower surface of the circular truncated cone, and the periphery of the elastic blocking piece (30) is fixed on the inner wall surface of the third liquid medicine channel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510344281.7A CN104888310B (en) | 2015-06-19 | 2015-06-19 | Blood return prevention infusion joint |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510344281.7A CN104888310B (en) | 2015-06-19 | 2015-06-19 | Blood return prevention infusion joint |
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| CN104888310A CN104888310A (en) | 2015-09-09 |
| CN104888310B true CN104888310B (en) | 2020-05-12 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106267446B (en) * | 2016-09-05 | 2019-07-19 | 南通安诺医疗科技有限公司 | Safe medicine injecting pump adapted liquid bag |
| CN106492306A (en) * | 2016-12-28 | 2017-03-15 | 天津哈娜好医材有限公司 | Transfusion device back-flow preventer and its using method |
| CN106668977A (en) * | 2016-12-28 | 2017-05-17 | 天津哈娜好医材有限公司 | Check valve used for infusion apparatus and use method of check valve |
| CN106880887A (en) * | 2017-03-29 | 2017-06-23 | 江苏人先医疗科技有限公司 | Preventing gravity fluid infusion structure and its application method |
| CN107684645A (en) * | 2017-09-19 | 2018-02-13 | 江苏苏云医疗器材有限公司 | Medical connector |
| CN108837224B (en) * | 2018-07-16 | 2021-02-02 | 青岛市精神卫生中心（青岛市第七人民医院、青岛市心理咨询中心） | Liquid medicine delivery device capable of preventing backflow |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9310673U1 (en) * | 1993-07-14 | 1994-08-18 | Braun Melsungen Ag | check valve |
| GB2443260C (en) * | 2006-10-26 | 2017-11-29 | Cellnovo Ltd | Micro-valve |
| CN202151451U (en) * | 2011-07-12 | 2012-02-29 | 郭敦 | Automatic liquid stopping exhaust device for infusion set |
| CN104797280B (en) * | 2013-01-02 | 2017-11-17 | 伊利诺斯工具制品有限公司 | The check-valves of filter with one |
| CN204840512U (en) * | 2015-06-19 | 2015-12-09 | 河南曙光健士医疗器械集团股份有限公司 | Prevent back that blood infusion connects |
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