Zero-residue positive-pressure needleless dosing connectorTechnical Field
The invention relates to a zero-residue positive pressure needleless dosing connector, and belongs to the field of medical appliances.
Background
Along with rapid development of intravenous infusion, the needleless closed infusion technology is widely applied to clinic, and needleless infusion refers to a type of instrument which can repeatedly convey or extract liquid to an infusion pipeline without puncturing, and a needleless medicine adding joint is adopted to provide a flow channel and an injection port for infusion. At present, most of needleless drug-adding joints have complex structure, complex operation and poor tightness, and residual liquid medicine in the joints cannot be eliminated, so that the possibility of exponential infection in the infusion process is brought to patients.
And the needle-free joint is sealed, so that more or less residual liquid is always remained in the needle-free dosing joint during infusion, and the traditional Chinese medicine liquid is reused to be doped with the residual liquid of the previous round, thereby affecting the safety of the liquid transportation and the subsequent reuse.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a zero-residue positive-pressure needleless medicine adding connector which is simple in structure, can realize positive-pressure transfusion by combining three accessories, ensures that the residual medicine liquid cannot be left in the connector during dredging, has small residue and avoids waste.
The technical scheme for achieving the purpose is that the zero-residual positive-pressure needleless dosing connector comprises a screw base connector, a sealing plug and a shell, wherein:
The screw base connector comprises a conical tube, a positioning column and a luer connector which are sequentially connected from top to bottom, wherein an annular column groove is formed in the outer wall surface of the conical tube along the circumferential direction of the conical tube, the conical tube is divided into an upper part and a lower part by the column groove, through holes which are vertically communicated are respectively formed in the middle parts of the positioning column and the luer connector, and the conical tube, the through holes of the positioning column and the through holes of the luer connector are sequentially communicated from top to bottom to form a through transfusion runner;
The bottom end of the sealing plug is provided with a conical tube mounting groove upwards, the inner wall surface of the conical tube mounting groove is provided with a sealing plug inner clamping ring matched with the column groove, the sealing plug inner clamping ring divides the conical tube mounting groove into an upper part and a lower part, and the upper part of the conical tube mounting groove is in a conical shape matched with the upper part of the conical tube;
the sealing plug is arranged in the shell, and the top end surface of the sealing plug is flush with the top end surface of the shell;
the conical tube of the screw base connector is inserted into the conical tube mounting groove of the sealing plug, and the inner clamping ring of the sealing plug is clamped in the column groove;
The positioning column of the screw base connector is positioned in the shell, and the bottom end of the sealing plug is arranged at the top end of the positioning column;
the bottom end of the housing is positioned at the top end of the luer fitting.
The zero-residue positive-pressure needleless dosing connector is characterized in that an annular clamping boss is arranged on the outer wall surface of the positioning column along the circumferential direction of the positioning column, a clamping groove matched with the clamping boss is formed in the inner wall surface of the shell, and the clamping boss is clamped in the clamping groove.
The zero-residual positive pressure needleless dosing connector is characterized in that the conical tube is positioned right below the sealing seam, and the sealing seam is closed in a natural state.
The zero-residue positive pressure needleless dosing connector is characterized in that the column groove is positioned below the top opening of the through infusion flow channel.
The zero-residue positive pressure needleless dosing connector is characterized in that the sealing plug is made of elastic silica gel.
The zero-residue positive pressure needleless medicine adding connector has a simple structure, can realize positive pressure transfusion by combining three accessories, ensures that the residual medicine liquid can not be left in the connector during dredging, has small residue amount and avoids waste.
Drawings
FIG. 1 is a cross-sectional view of a zero residual positive pressure needleless medicated joint of the present invention;
FIG. 2 is a block diagram of a screw base joint;
fig. 3 is a structural view of the sealing plug;
FIG. 4 is a schematic structural view of the housing;
FIG. 5 is a schematic illustration of the connection of a screw base fitting and a sealing plug;
FIG. 6 is a schematic diagram of the volume of the chamber in the initial/recovery state;
Fig. 7 is a schematic structural view of the volume of the cavity in a compressed state.
Detailed Description
In order to enable those skilled in the art to better understand the technical scheme of the present invention, the following detailed description is provided with reference to the accompanying drawings:
Referring to fig. 1, a zero-residual positive pressure needleless drug delivery connector according to a preferred embodiment of the present invention comprises a screw base connector 1, a sealing plug 2 and a housing 3.
Referring to fig. 2, the screw base connector 1 includes a tapered tube 11, a positioning column 12 and a luer connector 13 sequentially connected from top to bottom, an annular column groove 1a is formed on an outer wall surface of the tapered tube 11 along a circumferential direction of the tapered tube, the tapered tube 11 is divided into an upper portion and a lower portion by the column groove 1a, through holes penetrating up and down are respectively formed in the middle portions of the positioning column 12 and the luer connector 13, the through holes of the tapered tube 11, the positioning column 12 and the luer connector 13 are sequentially communicated from top to bottom to form a through infusion flow channel 14, and an annular buckling boss 15 is arranged on the outer wall surface of the positioning column 12 along the circumferential direction of the positioning column. The post recess 1a is located below the top opening of the through infusion flow channel 14.
Referring to fig. 3, the bottom end of the sealing plug 2 is provided with a conical tube mounting groove 21 upwards, the inner wall surface of the conical tube mounting groove 21 is provided with a sealing plug inner collar 2a adapted to the pillar groove 1a, the sealing plug inner collar 2a divides the conical tube mounting groove 21 into an upper part and a lower part, the upper part 2b of the conical tube mounting groove 21 is in a conical shape adapted to the upper part of the conical tube 11, the top end of the sealing plug 2 is provided with a sealing seam 22, and the sealing seam 22 is closed in a natural state.
Referring to fig. 4, a fastening groove 31 adapted to the fastening boss 15 is formed on an inner wall surface of the housing 3.
Referring to fig. 1 and 5 again, the sealing plug 2 is disposed in the housing 3, the top end surface of the sealing plug 2 is flush with the top end surface of the housing 3, the conical tube 11 of the screw base connector 1 is inserted into the conical tube mounting groove 21 of the sealing plug 2, the inner collar 2a of the sealing plug is clamped in the post groove 1a, the positioning post 12 of the screw base connector 1 is disposed in the housing 3, the fastening boss 15 is clamped in the fastening groove 31, the bottom end of the sealing plug 2 is disposed at the top end of the positioning post 12, and the bottom end of the housing 3 is disposed at the top end of the luer connector 13. The sealing plug 2 is made of elastic silica gel
Referring to fig. 6 and 7, the tapered tube 11 is located right below the sealing seam 22, the sealing seam 22 is closed in a natural state to block the through infusion flow channel 14, and in a use state, the tapered tube 11 pushes up the sealing seam 22, so that the through infusion flow channel 15 infuses outwards.
The zero-residual positive pressure needleless medicine adding connector has the advantages that the cavity volume of liquid is reserved due to the existence of the column groove 1a, the cavity volume is S1 in an initial state or a recovery state (see figure 6), the smaller the cavity volume S1 is, the smaller the residual quantity is, at the moment, the inner sealing plug clamping ring 2a is clamped in the column groove 1a, the smaller the cavity volume S1 is, the liquid can be saved, the waste is avoided, the conical tube 11 moves upwards in a compression state (see figure 7, namely in a use state), the inner sealing plug clamping ring 2a is separated from the column groove 1a, the cavity volume is S2, the cavity volume S2 is larger than the cavity volume S1, the conical tube 11 moves downwards for recovery, the inner sealing plug clamping ring 2a is clamped in the column groove 1a, and the inner sealing plug clamping ring 2a pushes the liquid to a human body to form positive pressure in the elastic recovery process of the sealing plug 2, so that positive pressure transfusion is realized.
According to the zero-residual positive-pressure needleless dosing connector, the upper part 2b of the conical tube mounting groove 21 is in a conical shape matched with the upper part of the conical tube 11, so that when the upper part of the conical tube 11 is inserted into the upper part 2b of the conical tube mounting groove 21, the initial volume (namely S1) of the volume of the cavity can be further reduced, liquid residues are reduced, and waste is avoided. The column groove 1a is positioned below the top opening of the through transfusion channel 14, which is beneficial to directly squeezing the liquid to the human body during resetting.
The zero-residual positive pressure needleless dosing joint has the main effects that the retainer ring 2a in the sealing plug is:
(1) In the resetting process, the liquid in the column groove is extruded to the human body, so that positive pressure transfusion is realized;
(2) The inner clamping ring of the sealing plug is clamped in the groove of the column, so that the fastening sealing in the initial state is realized;
(3) The liquid residue is reduced, and the waste is avoided.
In summary, the zero-residue positive pressure needleless medicine adding connector has a simple structure, can realize positive pressure transfusion by combining three accessories, ensures that the residual medicine liquid cannot be left in the connector during dredging, has small residue amount, and avoids waste.
It will be appreciated by persons skilled in the art that the above embodiments are provided for illustration only and not for limitation of the invention, and that variations and modifications of the above described embodiments are intended to fall within the scope of the claims of the invention as long as they fall within the true spirit of the invention.