Positive pressure needle-free jointTechnical Field
The invention relates to the technical field of needle-free joints, in particular to a positive pressure needle-free joint.
Background
Conventionally, if a liquid medicine is to be injected into a catheter or a drip bottle, the liquid medicine in the syringe is generally injected into the catheter or the drip bottle by using a syringe, so that the liquid medicine flows into a patient through a transfusion tube. The traditional syringe is necessarily provided with a needle head, so that medical staff is at risk of being needled due to the design of the needle head, and needle-free joints of different styles are developed successively in order to avoid the risk. However, when the needle-free joint in the prior art is used, the problem of backflow of liquid medicine is easily caused by the instant negative pressure state generated in the shell.
Disclosure of Invention
Therefore, the invention aims to overcome the defect that the needle-free joint in the prior art easily causes the backflow of liquid medicine.
In order to solve the technical problems, the invention provides a positive pressure needle-free joint, which comprises:
A housing comprising an inner cavity and a conduit;
The elastic deformation piece is arranged in the inner cavity and comprises a cavity;
The puncture guide assembly is arranged in the cavity and comprises a puncture part and a guide piece, the puncture part is connected with the guide piece, the guide piece comprises a guide part penetrating through the inner part and the outer part of the guide piece, the guide part and the elastic deformation piece are in a sealing state in an initial state, and the guide part is not conducted in the sealing state;
When the needleless injection cylinder is used for pushing against the elastic deformation piece, the puncture part punctures the elastic deformation piece, injection flows into the cavity, a positive pressure state is formed in the cavity instantly, the elastic deformation piece expands to enable the flow guiding part to be conducted, and the injection enters the inside of the flow guiding piece from the outside of the flow guiding piece through the flow guiding part and enters the guide pipe;
when the needleless injection tube is separated from the elastic deformation piece, a negative pressure state is formed in the cavity instantly, and the elastic deformation piece and the flow guiding part are restored to an initial sealing state.
In one embodiment of the present invention, the elastic deformation member includes an elastic deformation portion and an elastic frame, and the elastic deformation portion is connected to the elastic frame, where the conduction of the flow guiding portion is achieved through expansion and return of the elastic deformation portion.
In one embodiment of the present invention, the other end of the elastic deformation portion opposite to the elastic frame body is provided with an easy-to-pierce portion, and when the elastic deformation portion is pushed against by the needleless syringe, the elastic deformation portion moves in a clockwise direction so that the piercing portion pierces the easy-to-pierce portion.
In one embodiment of the present invention, a cap is disposed at the other end of the housing opposite to the catheter, and the easy-to-pierce portion is accommodated in the cap and is movable in the cap.
In one embodiment of the present invention, the elastic frame body includes a blocking portion, the blocking portion is disposed at the other end of the elastic frame body away from the elastic deformation portion, the blocking portion faces the conduit, and circulation or blocking of the injection is achieved by opening or closing the blocking portion.
In one embodiment of the invention, the blocking part comprises a pair of valve clacks, one end of each valve clack is fixedly connected with the elastic frame body, and the other end of each valve clack is opened or closed to realize the circulation or blocking of the injection.
In one embodiment of the present invention, the flow guiding member includes a first flow passage and a second flow passage, the first flow passage and the second flow passage being provided outside and inside the flow guiding member, respectively, the first flow passage and the second flow passage being communicated through the flow guiding portion.
In one embodiment of the present invention, the flow guiding portion is a flow guiding hole, the flow guiding hole is disposed on the first flow channel, the first flow channel is not conducted with the second flow channel when the flow guiding hole is in an initial close state with the elastic deformation portion, and the first flow channel is conducted with the second flow channel when the elastic deformation portion expands.
In one embodiment of the invention, the housing comprises a first housing and a second housing, the first housing and the second housing being snap-fit.
In one embodiment of the invention, the first shell and the second shell are provided with concave-convex ribs, the end surfaces of the first shell and the second shell provided with the concave-convex ribs are inclined conical surfaces, and the first shell and the second shell are in sealing connection through the concave-convex ribs.
Compared with the prior art, the technical scheme of the invention has the following advantages:
According to the invention, through the cooperation of the elastic deformation piece and the puncture guide assembly, when the needleless injection tube is separated from the elastic deformation piece, a negative pressure state is formed in the cavity of the elastic deformation piece instantly, and the elastic deformation piece is contracted and reset at the moment, so that the elastic deformation piece and the guide part are restored to an initial sealing state, namely the guide hole is not conducted, the injection cannot flow back through the guide part, and the problem that the needle-free joint in the prior art easily causes liquid medicine to flow back is effectively solved.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings, in which
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a schematic cross-sectional view of A-A of fig. 2.
Fig. 4 is a schematic cross-sectional view of B-B of fig. 2.
Fig. 5 is a schematic structural view of the puncture guide assembly of the present invention.
Fig. 6 is a schematic structural view of the elastic deformation portion of the present invention.
Fig. 7 is a schematic structural view of the elastic frame body of the present invention.
The reference numerals of the specification are 110, a first shell, 120, a second shell, 130, an inner cavity, 140, a catheter, 150, a cap, 210, an elastic deformation part, 211, an easy-to-puncture part, 220, an elastic frame, 221, a valve clack, 230, a cavity, 300, a puncture guide assembly, 310, a puncture part, 320, a guide piece, 321, a guide part, 322, a first flow channel, 323 and a second flow channel.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
Referring to fig. 1 to 7, an embodiment of the invention provides a positive pressure needle-free connector, which includes a housing, an elastic deformation member and a puncture guiding assembly 300.
The housing includes a housing 110 and a second housing 120, and the first housing 110 and the second housing 120 are in snap connection. Preferably, the first housing 110 and the second housing 120 may be provided with concave-convex ribs, and end surfaces of the first housing 110 and the second housing 120 provided with the concave-convex ribs are inclined conical surfaces, and the first housing 110 and the second housing 120 are connected in a sealing manner through the concave-convex ribs.
The first housing 110 is provided with an inner cavity 130, the inner cavity 130 forms a cap 150 at one end of the first housing 110, the inner cavity 130 is used for accommodating the elastic deformation member, the second housing 120 is provided with a conduit 140, and the conduit 140 is used for guiding the injection to be led out.
The elastic deformation member is disposed in the inner cavity 130, and the elastic deformation member includes a cavity 230, and the cavity 230 is configured to accommodate the puncture guiding assembly 300.
The elastic deformation member includes an elastic deformation portion 210 and an elastic frame 220, the elastic deformation portion 210 and the elastic frame 220 are accommodated in the inner cavity 130 of the first housing 110, and the elastic deformation portion 210 is connected with the elastic frame 220.
The other end of the elastic deformation portion 210 opposite to the elastic frame 220 is provided with an easy-to-pierce portion 211, the easy-to-pierce portion 211 is accommodated in the cap 150 and can move in the cap 150, the easy-to-pierce portion 211 is preferably made of silica gel, when a needleless syringe (not shown in the figure) is used to push against the elastic deformation portion 210, the easy-to-pierce portion 211 is moved in a proper direction by the easy-to-pierce portion 211, and of course, the easy-to-pierce portion 211 can be other easy-to-pierce portions 211 which can be pierced, and the embodiment is not limited thereto.
The elastic frame 220 includes a partition portion, which is disposed at the other end of the elastic frame 220 away from the elastic deformation portion 210, and the partition portion faces the conduit 140, and the injection is circulated or blocked by opening or closing the partition portion.
More specifically, the blocking portion includes a pair of valve flaps 221, one end of each valve flap 221 is fixedly connected to the elastic frame 220, and the other end of each valve flap 221 is opened or closed to realize the circulation or blocking of the injection. The pair of valve flaps 221 are in an open state when receiving the pressing force of the flow guide 320, and when the pressing force of the flow guide 320 disappears, the pair of valve flaps 221 are restored to a closed state. The principle of opening or closing the pair of valve flaps 221 is that when the puncture part 310 punctures the puncture part 211 of the elastic deformation part 210, the puncture part 211 applies a downward equal force to the puncture part 310 (namely the flow guide piece 320) according to the principle of acting force and reacting force, so that the pair of valve flaps 221 are in an opened state when being pressed, and when the pressing force disappears, the pair of valve flaps 221 are restored to a closed state, thereby effectively avoiding the problem of backflow of injection liquid caused by the fact that the shell is in a negative pressure state instantaneously.
The puncture and guide assembly 300 is disposed in the cavity 230, the puncture and guide assembly 300 includes a puncture portion 310 and a guide member 320, the puncture portion 310 is connected to the guide member 320, the guide member 320 includes a guide portion 321 penetrating through the inside and the outside of the guide member 320, wherein the guide portion 321 and the elastic deformation portion 210 are in a sealed state in an initial state, and the guide portion 321 is not conductive in the sealed state.
The flow guide 320 includes a first flow passage 322 and a second flow passage 323, the first flow passage 322 and the second flow passage 323 are respectively disposed at the outside and inside of the flow guide 320, and the first flow passage 322 and the second flow passage 323 communicate through the flow guide portion 321. The diversion portion 321 is a diversion hole, the diversion hole is disposed on the first flow channel 322, the first flow channel 322 is not communicated with the second flow channel 323 when the diversion hole is in an initial close state with the elastic deformation portion 210, and the first flow channel 322 is communicated with the second flow channel 323 when the elastic deformation portion 210 expands.
The invention has the following working principle that when a needleless injection tube is used to push against the pricking part 211 of the elastic deformation part 210, the elastic deformation part 210 is compressed and moves forward, so that the pricking part 310 pierces the pricking part 211, the pricking part 310 pierces silica gel on the needleless injection tube (not shown in the figure), injection flows into the cavity 230, a positive pressure state is instantaneously formed in the cavity 230, the elastic deformation part 210 expands, so that a diversion hole is conducted, namely, the first flow channel 322 is conducted with the second flow channel 323, injection enters the second flow channel 323 from the first flow channel 322 through the diversion hole and enters the guide tube 140 along the second flow channel 323, and when the needleless injection tube is separated from the elastic deformation part 210, a negative pressure state is instantaneously formed in the cavity 230, the elastic deformation part 210 and the diversion hole are restored to an initial sealing state, namely, the first flow channel 322 and the second flow channel 323 are not conducted, and the injection in the second flow channel 323 cannot flow back through the diversion hole, so that the problem that backflow is easily caused by a needleless joint in the prior art is effectively solved.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.