CN113041431A

CN113041431A - Needleless connector

Info

Publication number: CN113041431A
Application number: CN201911369468.7A
Authority: CN
Inventors: 周克东; 栗亚
Original assignee: Amsino Medical Kunshan Co ltd
Current assignee: Amsino Medical Kunshan Co ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2021-06-29

Abstract

The invention discloses a needleless connector, which comprises a shell and an elastic valve core. The shell is provided with an inner cavity, an access port and an output port, and the access port, the inner cavity and the output port are sequentially communicated from top to bottom. The elastic valve core comprises a head, a body and a bottom, the head, the body and the bottom are sequentially connected from top to bottom, the upper part of the head extends into the access port, a head groove is formed in the side face of the upper part of the head, and the lower part, the body and the bottom of the head are located in the inner cavity. The bottom is supported on the bottom surface of the inner cavity of the shell and is arched, the bottom is provided with a central through groove which is downward opened and penetrates through the front side surface and the rear side surface of the bottom, and the left side surface and the right side surface of the bottom are also symmetrically provided with gaps which are downward opened and penetrate through the central through groove. The elastic valve core of the needleless connector is easy to compress and has larger resilience force, and the needleless connector can be ensured to have larger liquid flow velocity when dosing.

Description

Needleless connector

Technical Field

The invention relates to a medical instrument, in particular to a needleless connector.

Background

At present, when the infusion needs to be repeatedly carried out for a long time in the process of intravenous infusion treatment, a vein indwelling needle or an indwelling catheter entering the vein of a human body is generally connected with a liquid medicine injection device through a needleless connector, so that the medicine adding is realized.

The needleless connector mainly comprises a shell and an elastic valve core arranged in the shell. The requirement for the elastic valve core is that the elastic valve core is easy to compress and has larger resilience force so as to ensure that the elastic valve core can accurately reset after being compressed. In addition, after the elastic valve core is deformed and the needle-free connector is in an open state, the needle-free connector also needs to have a faster liquid flow rate so as to ensure the infusion efficiency. The above requirements are closely related to the shape of the resilient valve element.

Disclosure of Invention

The invention aims to solve the technical problem of providing a needleless connector, wherein an elastic valve core of the needleless connector is easy to compress and has larger resilience force, and the needleless connector can ensure larger liquid flow rate when medicine is added.

The embodiment of the invention provides a needleless connector, which comprises a shell and an elastic valve core; the shell is provided with an inner cavity, an access port and an output port, and the access port, the inner cavity and the output port are sequentially communicated from top to bottom; the elastic valve core comprises a head part, a body part and a bottom part, the head part, the body part and the bottom part are sequentially connected from top to bottom, the upper part of the head part extends into the access port, a head groove is formed in the side surface of the upper part of the head part, the lower part of the head part, the body part and the bottom part are located in the inner cavity, the bottom part is supported on the bottom surface of the inner cavity of the shell, the bottom part is in an arched door shape, the bottom part is provided with a downward opening and penetrates through a central through groove of the front side surface and the rear side surface of the bottom part, and the left side surface and the right side.

The invention has the beneficial effects that:

the side surface of the head of the elastic valve core is provided with the head groove, the deformation of the head groove under the compressed state enables the top surface to be in a collapse state, and a larger gap is generated between the head groove and the bottom surface of a luer joint extending into the access port, so that the liquid flow and the flow speed at the access port are increased. In addition, the openings are formed in the front, back, left and right directions of the bottom, so that the elastic valve core is ensured to have larger resilience force and resetting accuracy, and the liquid flow and flow speed at the output port of the needleless connector are increased.

Drawings

Fig. 1 shows a schematic perspective view of a needleless connector in accordance with a first embodiment of the present invention.

Figures 2 and 3 show a schematic cross-sectional view of a needleless connector in accordance with a first embodiment of the present invention from two mutually orthogonal directions,

fig. 4 and 5 show the process of compressing the elastic valve core of the needleless connector in accordance with the first embodiment of the present invention.

Fig. 6 to 8 are schematic sectional views showing a needle-less connector according to a second embodiment of the present invention, in which the head portion of the elastic valve element in fig. 6 is in an initial position, and fig. 7 and 8 show the process in which the elastic valve element is compressed, respectively.

Fig. 9 and 10 show schematic sectional views of a needleless connector in accordance with a third embodiment of the present invention in a closed state and an open state, respectively.

Detailed Description

The present invention is described in further detail below with reference to the attached drawing figures.

Refer to fig. 1 to 3. The needleless connector according to the first embodiment of the present invention comprises a housing 1 and a resilient valve element 2.

The housing 1 includes an upper cover 11 and a base 12, the upper cover 11 includes an upper cover body 111 and an inlet pipe 3 provided at an upper end of the upper cover body, and the base 12 includes a base body 121 and an outlet pipe 4 provided at a lower end of the base body. Inlet tube 3 is a female luer fitting and outlet tube 4 is a cylindrical straight tube. The upper cover 11 and the base 12 are hermetically connected and jointly define a cavity 10 of the housing, the central hole of the inlet pipe 3 and the central hole of the outlet pipe 4 respectively form an access port 30 and an output port 40, and the access port 30, the inner cavity 10 and the output port 40 are sequentially communicated from top to bottom.

The elastic valve core 2 comprises a head part 21, a body part 22 and a bottom part 23, wherein the head part 21, the body part 22 and the bottom part 23 are sequentially connected from top to bottom. The upper portion of the head 21 extends into the access port 30, the side of the upper portion of the head 21 is provided with a head recess 211, the lower portion of the head 21, the body 22 and the base 23 are located in the internal cavity 10, and the base 23 is supported on the bottom surface of the internal cavity of the housing. The bottom 23 has an arch shape, the bottom 23 has a central through groove 230 which is opened downward and penetrates the front side and the rear side of the bottom 23, and the left side and the right side of the bottom 23 are further provided with notches 231 which are opened downward and penetrate the central through groove 230, respectively, symmetrically to each other. Optionally, the shape of the central through slot 230 and each notch 231 is arcuate, and in other embodiments, the shape of the central through slot 230 and each notch 231 may also be trapezoidal, triangular, and the like.

Further, the left side and the right side of the lower end of the bottom 23 of the elastic valve core 2 respectively abut against the side wall of the inner cavity of the shell.

Further, two body grooves 221 are further disposed on the side surface of the body 22, and the head grooves 211 and the two body grooves 221 are staggered from top to bottom, that is, as shown in fig. 3, the head groove 211 is located at the top and located at the front side of the elastic valve core, the middle body groove 221 is located at the rear side of the elastic valve core, and the lowest body groove 221 is located at the front side of the elastic valve core. In other embodiments, the number of the body grooves 221 may be one, four, etc., and the head grooves 211 and the body grooves 221 may also be staggered from top to bottom. The advantage of this structure is that when the elastic valve core 2 is under axial pressure, because the direction of the head groove and the body groove is just the transmission direction of the component force, the axial pressure can be transmitted to the elastic valve core with the largest component force, the deformation and the opening of the elastic valve core are maximized, so as to increase the flow rate of the liquid medicine, and the elastic valve core is easier to compress.

The resilient valve core 2 is made of a non-metallic elastomeric material. Preferably, the material of the elastic valve core 2 is silica gel, thermoplastic elastomer (TPE) or rubber.

As shown in fig. 3, when the needleless connector is in a closed state, the head 21 closes and seals the access port 30. In this embodiment, the side wall of the top end of the head 21 is provided with a sealing ring 213, and the sealing ring 213 forms a seal with the inner surface of the access port 30; the lower end of the head 21 has a truncated cone-shaped enlarged portion 214, a truncated cone-shaped shoulder 114 is provided at the transition position of the access port 30 and the inner cavity 10, and the enlarged portion 214 abuts against the shoulder 114 to form a seal.

As shown in fig. 4, when the top surface of the elastic valve element 2 is pushed by the luer 7 of an external medical fluid injection apparatus such as a syringe, the head portion 21 moves downward, and the body portion 22 is elastically deformed by pressure. As shown in fig. 5, when the head portion 21 is separated from the shoulder portion 114, the head portion 21 is deformed toward the head recess 211 side due to lack of support from the side, thereby collapsing the top surface of the head portion 21. At the same time, the head 21 transmits pressure to the bottom 23, causing the bottom 23 to move in the forward and backward directions and expand against the side walls of the housing cavity, thereby preventing the bottom 23 from shifting. At this time, the sealing between the sealing ring 213 and the inner surface of the access port 30 and the sealing between the expanding portion 214 and the shoulder portion 114 are opened, and the medical fluid introduced from the access port 30 flows into the output port 40 through the fluid flow path formed by the gap between the inner wall of the housing 1 and the outer wall of the elastic valve element 2, the through groove 230 formed on the bottom portion 23, and the two notches 231, and then enters into the other catheter of the indwelling catheter connected to the outlet tube 4, thereby completing the clinical transfusion process.

When the external luer connector 7 is screwed out, the axial stress applied to the elastic valve core 2 is removed, and the whole circumferential direction of the elastic valve core 2 has upward force, and the final resultant force can act on the central part of the elastic valve core 2, so that the elastic valve core 2 is stressed uniformly in the process of restoring to the original position and cannot deviate, and the elastic valve core can be quickly and accurately restored to the original shape. Once the head 21 is returned to the initial position, the access port 30 is once again closed and sealed.

Fig. 6 to 8 show a second embodiment of the present invention. The main difference between this embodiment and the first embodiment is that the structure of the body portion 22 and the position of the head recess 21 are different, the body portion 22 is provided with body recess 221a on the left and right side surfaces symmetrically, respectively, and the body portion 22 is further provided with a through hole 223 penetrating the front and rear side surfaces of the body portion, the through hole having a diamond shape. The head recess 211 is provided on the right side surface of the head 21. In other embodiments, the head recess 211 may be disposed on the left side, the front side, or the rear side of the head 21.

The provision of the body recess 221a and the diamond-shaped through hole 223 in symmetry with each other makes the body 22 more easily compressed and ensures that an upward elastic restoring force is provided to the head 21. In other embodiments, the shape of the through hole 223 may be an ellipse or the like.

Fig. 9 and 10 show a third embodiment of the present invention. The main difference between this embodiment and the second embodiment is that the body portion 22 is not provided with the through-hole 223.

The invention is used in combination with an infusion catheter or an injector clinically. The inlet can be connected with Ruhr joint of injector, transfusion system and three-way pipe, and the outlet can be connected with catheter inserted into human blood vessel. The needleless connector is also capable of delivering multiple liquids simultaneously.

The present embodiment has been described in conjunction with specific examples, but it will be understood by those of ordinary skill in the art that the present invention is not limited to the examples described herein, and that various modifications and changes may be made without departing from the spirit and scope of the present invention.

Claims

1. A needleless connector comprises a shell and an elastic valve core; the shell is provided with an inner cavity, an access port and an output port, and the access port, the inner cavity and the output port are sequentially communicated from top to bottom; the elastic valve core comprises a head, a body and a bottom, wherein the head, the body and the bottom are sequentially connected from top to bottom, the upper part of the head extends into the access port, a head groove is arranged on the side surface of the upper part of the head, the lower part, the body and the bottom of the head are positioned in the inner cavity, and the bottom is supported on the bottom surface of the inner cavity of the shell.

2. The needleless connector of claim 1, wherein left and right sides of the lower end of the bottom portion of the resilient valve element each abut a side wall of the housing lumen.

3. The needleless connector of claim 1, wherein the bottom of the resilient valve element is adapted to move in a forward and rearward direction to expand against the side wall of the housing interior when subjected to axial pressure.

4. A needleless connector as in claim 1 or 2 or 3 wherein said central through slot and each of said indentations are arcuate in shape.

5. The needleless connector of claim 1 or 3, wherein the body portion is provided with a plurality of body portion grooves on the side surface; the head grooves and the body grooves are arranged in a staggered mode from top to bottom.

6. The needleless connector of claim 1 or 3, wherein the body portion is provided with a plurality of body portion grooves on the side surface; the head grooves and the body grooves are arranged in a left-right staggered mode from top to bottom.

7. The needleless connector of claim 1 or 3, wherein body grooves are respectively provided on the left side and the right side of the body symmetrically to each other.

8. The needleless connector of claim 7, wherein the body portion further comprises a through hole extending through the front and rear sides of the body portion.

9. The needleless connector of claim 1, wherein said housing comprises an upper cover and a base, said upper cover and said base being sealingly connected; the access port is arranged on the upper cover, and the output port is arranged on the base.

10. The needleless connector of claim 1, wherein the resilient member is a silicone, rubber, or thermoplastic elastomer.