CN107050558B - Positive pressure slow release joint - Google Patents
Positive pressure slow release joint Download PDFInfo
- Publication number
- CN107050558B CN107050558B CN201710283803.6A CN201710283803A CN107050558B CN 107050558 B CN107050558 B CN 107050558B CN 201710283803 A CN201710283803 A CN 201710283803A CN 107050558 B CN107050558 B CN 107050558B
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- Prior art keywords
- positive pressure
- piston
- shell
- section
- liquid
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/02—Access sites
- A61M39/0208—Subcutaneous access sites for injecting or removing fluids
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/10—Tube connectors; Tube couplings
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/02—Access sites
- A61M2039/0205—Access sites for injecting media
Abstract
When the positive pressure slow release connector is used, the external liquid infusion device is inserted into the sealing section to push the piston to move downwards until the piston moves back to the movable section, the external connector is communicated with the positive pressure cavity, and liquid of the external liquid infusion device sequentially passes through the input port, the sealing section, the shunt tank, the positive pressure cavity, the liquid through hole, the column channel and the output port. When the transfusion is finished, the external joint is pulled out to stop the transfusion, the piston is driven by the elastic piece to restore to plug the positive pressure cavity by the elastic piece, and meanwhile, the liquid through hole is plugged by the piston. At this time, the positive pressure cavity is filled with liquid, and a micro-seepage channel is formed in the connector, so that the thrombus of the venous indwelling needle in the state of stopping transfusion can be effectively prevented. The infusion device has the advantages that normal infusion is realized, micro-seepage can be formed in the connector during non-infusion, thrombus formation is effectively prevented, the infusion device is automatically switched to a positive pressure micro-seepage state after being removed from an external infusion apparatus, blood reflux is reduced, no additional operation of medical staff is needed, and the working intensity of the medical staff is greatly reduced.
Description
Technical Field
The invention relates to the technical field of medical machinery, in particular to a positive pressure slow release joint.
Background
With the continuous improvement of nursing technology, medical supplies are continuously updated, and indwelling needles have been recommended by world health organizations as the safest puncture tools. The operation is simple, the repeated puncturing can be reduced, the blood vessel is protected, the pain of the patient is relieved, the clinical medication and emergency rescue are convenient, the workload of nurses is relieved, and the medicine is widely applied to clinic. However, the venous indwelling needle has some new problems in clinical work, and after each infusion is finished, if the needle tube or the conical head or the external connector of the infusion set is directly pulled out from the indwelling device, a cavity is formed, negative pressure is caused, blood is caused to flow back into the indwelling device, thrombus is formed to block the indwelling device, and therefore, a positive pressure connector is often used for preventing the blood from flowing back to block.
When liquid is required to be input through the positive pressure connector in use, the external connector of the infusion apparatus is used for pressing down the piston core rod of the positive pressure connector, and a column channel is formed between the piston core rod and the shell; when the external connector is required to be pulled out when the infusion is stopped, the elastic structure is arranged in the positive pressure connector, the elastic structure can deform to push the inner shaft to restore the original state and separate the column channel, when the infusion external connector is pulled out, the internal body fluid can be immediately discharged forwards due to the recovery of the piston core rod, and then no liquid is discharged forwards to form thrombus and blockage, so that the thrombus cannot be effectively prevented from being formed by the traditional positive pressure connector.
Therefore, a retaining needle capable of continuously providing positive pressure appears in the market, for example, patent number 201520591421.6 discloses a venous retaining needle capable of continuously providing positive pressure and preventing thrombus, which is characterized in that a three-way connector is arranged, and transfusion and positive pressure micro-seepage are respectively and independently realized at different interfaces of the three-way connector. In the use, before continuous positive pressure liquid supply device dress is tee bend connects, medical personnel independently operate continuous positive pressure liquid supply device and inhale liquid, hold continuous positive pressure liquid supply device again and adorn on tee bend connects, realize that the inside liquid of continuous positive pressure liquid supply device is toward tee bend connects's delivery outlet malleation micropsmoothes to prevent to form the thrombus, such troublesome operation, it is inconvenient to take the external malleation device of manual work, brings the use for medical personnel, can not in time form the malleation in tee bend connects after accomplishing the infusion moreover, causes the blood to flow back, influences medical treatment effect.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides the positive pressure slow release connector which can realize normal transfusion, can realize positive pressure micro-permeation to prevent thrombosis during non-transfusion and can automatically switch between transfusion and positive pressure micro-permeation.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the positive pressure slow release connector comprises a hollow shell, a piston and a plugging assembly, wherein the piston and the plugging assembly are arranged in the shell, the upper end of the shell is an input port, and the lower end of the shell is an output port;
the piston seals the input port, the sealing assembly is connected with the inner wall of the shell in a sealing way, a positive pressure cavity is formed between the piston and the sealing assembly, an elastic piece for applying force to the sealing assembly towards the positive pressure cavity is arranged in the shell, a column body is fixed in the shell, a column channel is arranged in the column body, the upper end part of the column channel passes through the sealing assembly and is communicated with the positive pressure cavity, the lower end part of the column channel is communicated with the output port, and a liquid through hole is formed in the side wall of the upper end part of the column body; the upper end part of the column channel is provided with a micro-seepage device;
the positive pressure cavity is communicated with the column channel through the liquid through hole on one hand and communicated with the column channel through the micro-seepage device on the other hand;
the piston is pushed downwards to leave the input port and then the input port is communicated with the positive pressure cavity, so that an infusion channel 'input port-positive pressure cavity-liquid through hole-column channel-output port' is formed; the piston restores to seal the input port after the downward pushing force on the piston is removed, the sealing assembly moves to seal the liquid through hole under the action of the elastic piece, so that the positive pressure cavity is further slowly compressed after the infusion channel is disconnected, and only the micro-seepage channel 'positive pressure cavity-micro-seepage device-column channel-output port' is left.
The shell comprises a sealing section and a movable section which are sequentially arranged up and down, the plugging assembly and the piston are combined into a whole, the piston comprises a body section and a transition section arranged above the body section, the upper end of the transition section is in sealing connection with the sealing section, the body section is in sealing connection with the movable section, an inner channel is formed in the hollow transition section, the upper end of a cylinder penetrates through the body section and is communicated with the inner channel, the side wall of the transition section is provided with a through hole for communicating a positive pressure cavity and the inner channel, the liquid through hole is arranged below the micro-seepage device, a sealing ring is arranged in the body section and is tightly sleeved on the outer wall of the cylinder, the sealing ring can slide along the axial direction of the cylinder along with the piston, one end of the elastic piece is propped against the piston, and the other end of the elastic piece is propped against the shell.
Preferably, the through hole is a slot hole.
The transition section is provided with an upper sealing groove, the body section is provided with a lower sealing groove, the upper sealing groove is connected with an upper sealing ring used for enabling the transition section to be in sealing connection with the inner wall of the sealing section, and the lower sealing groove is connected with a lower sealing ring used for enabling the body section to be in sealing connection with the inner wall of the movable section.
Wherein, the sealed section is provided with the splitter box to the department of activity section transition, and the input port passes through splitter box and malleation chamber intercommunication.
The elastic piece is sleeved outside the column body, one end of the elastic piece is propped against the plugging component, the other end of the elastic piece is propped against the shell, and the elastic piece is made of elastic polymer materials or is a compression spring.
Wherein the top surface of the piston is an inclined surface so as to form an infusion port.
The shell comprises a shell body and a lower connecting seat which are fixedly connected with each other, an output hole is formed in the lower connecting seat, and the lower end part of the column body is fixedly connected with the output hole in a plugging mode.
Wherein, welded fastening is provided between shell body and the lower connecting seat, perhaps is provided with joint structure and comes fixed connection between shell body and the lower connecting seat.
Wherein, form the activity space between shell inner wall and the cylinder outer wall, combine between shutoff subassembly and the lower connecting seat, lower connecting seat is provided with the exhaust hole of intercommunication activity space and external world.
The positive pressure slow release connector also comprises a protective cap, wherein the protective cap is connected with the input port of the shell through threads, and the protective cap is internally provided with disinfectant absorbent cotton or disinfectant cotton-free.
The invention has the beneficial effects that:
compared with the prior art, the positive pressure slow release connector is used by connecting an external liquid infusion apparatus with an input port, pushing a piston to move downwards until the piston is released from blocking the input port, at the moment, the input port is communicated with a positive pressure cavity, and liquid of the external liquid infusion apparatus sequentially passes through the input port, the positive pressure cavity, a liquid through hole, a column channel and an output port. When the transfusion is finished, the downward pushing force on the piston is removed, and the piston recovers to seal the input port. At this moment, the positive pressure cavity is filled with liquid, under the action of the elastic piece, the plugging component moves to seal the liquid through hole under the action of the elastic piece so as to further slowly compress the positive pressure cavity after the infusion channel is disconnected, only a micro-seepage channel of positive pressure cavity-micro-seepage device-column channel-output port is left, the duration of micro-seepage is long, thrombus formation of the venous indwelling needle in a stopped infusion state can be effectively prevented, medical staff is not required to wash the tube according to a certain time interval, the workload of the medical staff is greatly reduced, and the washing tube cost of a patient is reduced. The invention can realize normal transfusion, can form a micro-seepage channel in the connector when not in transfusion, effectively prevent thrombosis, and automatically switch to a positive pressure micro-seepage state immediately after the external transfusion device is removed, thereby furthest reducing blood reflux, avoiding the need of other operation of medical staff and greatly reducing the working intensity of the medical staff.
Drawings
Fig. 1 is a sectional view of a positive pressure sustained release joint in an initial state in an embodiment.
Fig. 2 is a schematic structural diagram of a positive pressure sustained release connector after insertion into an external connector in an embodiment.
Fig. 3 is a schematic structural view of a positive pressure sustained release joint in an embodiment in which a continuous positive pressure micro-osmotic state is maintained.
Fig. 4 is an exploded view of the structure of a positive pressure sustained release joint in an embodiment.
Fig. 5 is a perspective view of a piston of a positive pressure sustained release joint in an embodiment.
Reference numerals:
a protective cap 1;
the shell 2, the input port 21, the output port 22, the shell body 23, the sealing section 231, the movable section 232, the lower connecting seat 24, the output hole 241 and the exhaust hole 242;
a movable space 3;
the piston 4, the body section 41, the lower seal groove 411, the transition section 42, the upper seal groove 421, the inner channel 43, the through hole 44 and the baffle 45;
column 5, column channel 51, liquid through hole 52;
an elastic member 6;
a positive pressure chamber 7;
a micro-seepage device 8, a conduit 81 and a seepage fiber column 82;
a seal ring 9;
and an external connection joint 10.
Detailed Description
The present invention will be described in detail with reference to specific embodiments and drawings.
The positive pressure slow release connector of the present embodiment, as shown in fig. 1 to 5, comprises a hollow housing 2, a protective cap 1 and a piston 4 arranged inside the housing 2, wherein the piston 4 can slide in the housing 2, an input port 21 is arranged at the upper end of the housing 2, an output port 22 is arranged at the lower end of the housing 2, and the protective cap 1 and the input port 21 are connected through threads so as to cover the input port 21. The housing 2 includes a housing body 23 and a lower connection seat 24 fixedly connected to each other, and the housing body 23 includes a seal section 231 and a movable section 232 which are disposed up and down in sequence, the diameter of the seal section 231 being smaller than the diameter of the movable section 232. The lower connecting seat 24 is provided with an output hole 241 for communicating an externally connected indwelling needle, and the shell body 23 and the lower connecting seat 24 are welded and fixed, or a clamping structure is arranged between the shell body 23 and the lower connecting seat 24 for fixed connection. A movable space 3 is formed between the inner wall of the shell 2 and the outer wall of the column 5 and between the combined piston 4 and the lower connecting seat 24, and the lower connecting seat 24 is provided with an exhaust hole 242 for communicating the movable space 3 with the outside, so that the movable space 3 is prevented from forming vacuum, and the piston 4 is ensured to slide smoothly in the shell. The inside of the shell 2 is provided with a column body 5, the lower end part of the column body 5 is inserted and fixed in the output hole 241, a column channel 51 is arranged in the column body 5, and the lower end part of the column channel 51 is communicated with the output port 22.
As shown in fig. 1, the cylinder 5 is sleeved with an elastic member 6 capable of providing a restoring force to the piston 4 in the direction of the seal segment 231; one end of the elastic member 6 abuts against the lower end of the piston 4, and the other end of the elastic member 6 abuts against the lower connecting seat 24, and in practice, a protrusion may be provided inside the housing 2 to support the lower end of the elastic member 6, but this is difficult to assemble, so that it is preferable to support the elastic member 6 against the lower connecting seat 24, and assembly is more convenient. The elastic member 6 is a sleeve made of elastic polymer material, or the elastic member 6 is a compression spring. The elastic piece 6 is preferably a sleeve made of elastic polymer material, so that the whole joint is free of metal, and is suitable for the nuclear magnetic resonance field and convenient to use. Of course, the elastic member 6 may be a spring made of metal. Or even the spring made of plastic material by injection molding.
In this embodiment, as shown in fig. 5, the piston 4 includes a body section 41 and a transition section 42 disposed above the body section 41, where the body section 41 and the transition section 42 are combined into a whole, and may be in a non-integral combined structure in practice, the body section 41 is matched with the movable section 232, the transition section 42 is matched with the sealing section 231, and the longitudinal section of the piston 4 is in a "convex" shape. The top surface of the transition section 42 is inclined to facilitate the formation of an infusion gap. The transition section 42 is provided with an upper seal groove 421, the upper seal groove 421 is connected with an upper seal ring for sealing connection between the upper end of the transition section 42 and the inner wall of the seal section 231, the body section 41 is provided with a lower seal groove 411, and the lower seal groove 411 is connected with a lower seal ring for sealing connection between the outer side wall of the body section 41 and the inner wall of the movable section 232. As shown in fig. 1 and 2, a positive pressure cavity 7 is formed between the piston 4 and the movable section 232, an inner channel 43 is formed in the hollow of the transition section 42, a through hole 44 for communicating the positive pressure cavity 7 with the inner channel 43 is formed in the side wall of the transition section 42, the through hole 44 is a groove hole or a round hole, preferably a groove hole along the axial direction, because before transfusion, air in the inner channel 43 needs to be discharged through liquid passing, the round hole is easily blocked by liquid, so that the air in the inner channel 43 cannot be discharged, and the groove hole is more convenient for discharging. The upper end of the column 5 passes through the body section 41 and is communicated with the inner channel 43, the upper end of the column channel 51 is provided with the micro-seepage device 8 which is communicated with the positive pressure cavity 7 and the column channel 51, and the micro-seepage channel which sequentially passes through the positive pressure cavity 7, the through hole 44, the inner channel 43, the micro-seepage device 8 and the column channel 51 can be formed. The micro-osmotic device 8 comprises a conduit 81 fixed at the upper end of the column 5 and an osmotic fiber column 82 assembled in the conduit 81, and the diameter of the osmotic fiber column 82 is 0.1-1mm. The conduit 81 and the built-in liquid-permeable fiber column 82 are prepared by direct extrusion molding or injection molding, and the production and processing technology is simple. The liquid-permeable fiber column 82 is capable of slowly performing micro-liquid permeation under the action of positive pressure, and the liquid-permeable fiber column 82 can be cotton threads or fiber columns permeable to other materials.
The upper end side wall of the cylinder 5 is provided with a liquid through hole 52 for communicating the positive pressure cavity 7 with the cylinder channel 51, the liquid through hole 52 is arranged below the micro-seepage device 8, a sealing ring 9 is arranged in the body section 41, the sealing ring 9 is tightly sleeved on the outer wall of the cylinder 5, the lower end of the piston 4 is provided with a baffle 45 for fixing the sealing ring 9 on the piston 4, the sealing ring 9 can slide along the axial direction of the cylinder 5 along with the piston 4, the sealing ring 9 can block the liquid through hole 52 in an upward moving manner, and the blocking of the liquid through hole 52 can be relieved in a downward moving manner. The sealing section 231 is provided with the splitter box in the department of transition to movable section 232, and the splitter box can be spacing to piston 4 descending, and the upper end of piston 4 need not push away movable section 232 completely, and when the upper seal ring was moved back to the splitter box, liquid just can flow into positive pressure chamber 7 from the splitter box.
In the use process, when transfusion is needed, the protective cap 1 is unscrewed firstly, as shown in fig. 1, then the external connector 10 of the external liquid transfusion device is inserted into the sealing section 231, the piston 4 is pushed to move downwards, the elastic piece 6 is compressed until the upper sealing ring is retracted to the shunt groove, the positive pressure cavity 7 is not blocked by the piston 4, the external connector 10 is communicated with the positive pressure cavity 7, as shown by a dotted arrow in fig. 2, liquid of the external liquid transfusion device sequentially passes through the external connector 10, the input port 21, the sealing section 231, the shunt groove, the positive pressure cavity 7, the liquid through hole 52, the column channel 51 and the output port 22, after the liquid is seen to be discharged from the output port 22, namely, air in the connector is discharged from the output port 22, and then the lower connecting seat 24 is connected to the external indwelling needle for transfusion. When the transfusion is finished, the external connector 10 is pulled out to stop the transfusion, and the protective cap 1 is screwed up at the input port 21, so that the structure shown in fig. 3 is formed. Under the action of the elastic piece 6, the elastic piece 6 drives the piston 4 to move upwards to restore to seal the positive pressure cavity 7, and meanwhile, the sealing ring 9 also moves upwards to seal the liquid through hole 52. At this time, the positive pressure cavity 7 is filled with liquid, as shown in fig. 3, and the joint is internally provided with a micro-seepage channel which sequentially passes through the positive pressure cavity 7, the through hole 44, the inner channel 43, the micro-seepage device 8, the column channel 51 and the external indwelling needle, so that the micro-seepage can be continued for more than 24 hours, the medical staff can be prevented from flushing once every 6 hours, thrombus formation of the venous indwelling needle in the stopped transfusion state can be effectively prevented, the medical staff is not required to wash the catheter according to a certain time interval, the workload of the medical staff is greatly reduced, and the washing cost of the patient is reduced. Compared with the prior art, the positive pressure slow release connector of the embodiment can realize normal transfusion, can form micro-seepage in the connector when not in transfusion, effectively prevent thrombosis, automatically switch to a positive pressure micro-seepage state after stopping transfusion, furthest reduce blood reflux, avoid the need of additional operation of medical staff, and greatly reduce the working intensity of the medical staff.
In practice, the piston and the plugging assembly are not necessarily combined into a whole, the piston seals the input port, the plugging assembly is in sealing connection with the inner wall of the shell, the piston is linked with the plugging assembly, and the piston can reset through the elastic piece 6 or can be of a structure with automatic reset, and the structure is not repeated here. As long as the essential functions of the invention can be realized, the infusion channel 'input port-positive pressure cavity-liquid through hole-column channel-output port' can be formed, the liquid through hole 52 can be automatically blocked to disconnect the infusion channel after the downward pushing force of the piston is removed to stop infusion, the positive pressure cavity is further slowly compressed, and only the micro-seepage channel 'positive pressure cavity-micro-seepage device-column channel-output port' is left, so that continuous positive pressure micro-seepage is provided. The scheme capable of realizing automatic switching between infusion and positive pressure micro-seepage is within the protection range.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Claims (9)
1. A positive pressure slow release joint is characterized in that:
the device comprises a hollow shell and a piston arranged in the shell, wherein the upper end of the shell is an input port, and the lower end of the shell is an output port;
the piston seals the input port, the piston is connected with the inner wall of the shell in a sealing way, a positive pressure cavity is formed between the piston and the inner wall of the shell, an elastic piece for applying force to the piston towards the positive pressure cavity is arranged in the shell, a column body is fixed in the shell, a column channel is arranged in the column body, the upper end part of the column channel passes through the piston and is communicated with the positive pressure cavity, the lower end part of the column channel is communicated with the output port, and a liquid through hole is formed in the side wall of the upper end part of the column body; the upper end part of the column channel is provided with a micro-seepage device;
the positive pressure cavity is communicated with the column channel through the liquid through hole on one hand and communicated with the column channel through the micro-seepage device on the other hand;
the piston is pushed downwards to leave the input port and then the input port is communicated with the positive pressure cavity, so that an infusion channel 'input port-positive pressure cavity-liquid through hole-column channel-output port' is formed; removing the downward pushing force on the piston, recovering the piston to seal the input port, moving the piston to seal the liquid through hole under the action of the elastic piece, and then further slowly compressing the positive pressure cavity after breaking the infusion channel, wherein only the micro-seepage channel is left as a positive pressure cavity-micro-seepage device-column channel-output port;
the shell includes sealing section and the activity section that sets gradually from top to bottom, and the piston includes body section and the changeover portion of setting in body section top, sealing connection between the upper end and the sealing section of changeover portion, sealing connection between body section and the activity section, changeover portion cavity formation internal passage, the upper end of cylinder passes body section intercommunication to internal passage, and the lateral wall of changeover portion is provided with the through-hole that communicates malleation chamber and internal passage, the liquid through-hole sets up in the micropenetration device below, is equipped with the sealing ring in the body section, and the sealing ring closes into a whole with the piston, and the sealing ring tightly overlaps in the cylinder outer wall, and the sealing ring can be along the axial slip of cylinder with the piston, and the piston is supported to the one end of elastic component, and the other end of elastic component supports the shell.
2. The positive pressure sustained release joint of claim 1, wherein: the through holes are slot holes.
3. The positive pressure sustained release joint of claim 1, wherein: the transition part of the sealing section to the movable section is provided with a splitter box, and the input port is communicated with the positive pressure cavity through the splitter box.
4. The positive pressure sustained release joint of claim 1, wherein: the changeover portion is provided with the seal groove, and the body section is provided with down the seal groove, goes up the seal groove and is connected with the upper seal circle that is used for making changeover portion and seal section's inner wall sealing connection, and lower seal groove is connected with the lower seal circle that is used for making body section and movable section's inner wall sealing connection.
5. The positive pressure sustained release joint of claim 1, wherein: the elastic piece is sleeved outside the column body, one end of the elastic piece is propped against the piston, the other end of the elastic piece is propped against the shell, and the elastic piece is made of elastic polymer materials or is a compression spring.
6. The positive pressure sustained release joint of claim 1, wherein: the top surface of the piston is an inclined surface so as to form an infusion port.
7. The positive pressure sustained release joint of claim 1, wherein: the shell comprises a shell body and a lower connecting seat which are fixedly connected with each other, the lower connecting seat is provided with an output hole, and the lower end part of the column body is spliced and fixed in the output hole.
8. The positive pressure sustained release joint of claim 7, wherein: the shell body and the lower connecting seat are welded and fixed, or a clamping structure is arranged between the shell body and the lower connecting seat for fixed connection.
9. The positive pressure sustained release joint of claim 7, wherein: a movable space is formed between the inner wall of the shell and the outer wall of the column body and between the piston and the lower connecting seat, and the lower connecting seat is provided with an exhaust hole for communicating the movable space with the outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710283803.6A CN107050558B (en) | 2017-04-26 | 2017-04-26 | Positive pressure slow release joint |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710283803.6A CN107050558B (en) | 2017-04-26 | 2017-04-26 | Positive pressure slow release joint |
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| CN107050558A CN107050558A (en) | 2017-08-18 |
| CN107050558B true CN107050558B (en) | 2023-08-25 |
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| CN201710283803.6A Active CN107050558B (en) | 2017-04-26 | 2017-04-26 | Positive pressure slow release joint |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108421113B (en) * | 2018-03-23 | 2024-02-20 | 广东先来医疗器械有限公司 | Positive pressure slow release joint |
| CN108653864A (en) * | 2018-05-23 | 2018-10-16 | 镇江倍斯特曼新材料研究有限公司 | A kind of medical infusion connection combination apparatus |
| CN110643480A (en) * | 2018-06-26 | 2020-01-03 | 深圳市北科生物科技有限公司 | Liquid separation device and method thereof |
| CN108815698A (en) * | 2018-07-06 | 2018-11-16 | 苏州鑫康道医疗科技有限公司 | Continuous positive pressure 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 |
| CN108939206B (en) * | 2018-08-06 | 2023-07-14 | 江苏省人民医院（南京医科大学第一附属医院） | Sterile anti-reflux indwelling needle easy to fix |
| CN110680984B (en) * | 2019-11-04 | 2022-06-07 | 上海康德莱企业发展集团股份有限公司 | Needle-free dosing connector |
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