CN211658924U

CN211658924U - Blood return prevention remaining needle

Info

Publication number: CN211658924U
Application number: CN201921262661.6U
Authority: CN
Inventors: 丁如梅; 钱小洁; 范静
Original assignee: Shanghai Changzheng Hospital
Current assignee: Shanghai Changzheng Hospital
Priority date: 2019-08-06
Filing date: 2019-08-06
Publication date: 2020-10-13
Anticipated expiration: 2029-08-06

Abstract

The utility model relates to a blood return prevention indwelling needle. Including keeping somewhere the needle body and keeping somewhere the malleation device of this body coupling of needle, malleation device includes the malleation casing, case outside setting up in the malleation casing, set up the inner valve core in the case outside, the bottom of case sets up the fixed plate outside, set up the perforation at the center of fixed plate, set up first spring between case bottom surface and the fixed plate including, the below of case sets up the sleeve outside, telescopic symmetrical lateral wall has the interval with the malleation casing, form fluid passage, outer case penetrates from the sleeve top surface, set up the second spring between sleeve bottom surface and fixed plate, set up the bracing piece below the fixed plate, set up the ejector pin under the case including, set up two first runners outside the case lateral wall, set up the second runner of two "U" shapes of empting at the lateral wall of case including. The utility model has the advantages of simple and reasonable structure, convenient to use.

Description

Blood return prevention remaining needle

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a blood return prevention indwelling needle.

Background

The venous indwelling needle consists of a stainless steel core, a soft outer sleeve and a plastic needle seat, and is an infusion tool for infusing the blood vessel by penetrating the outer sleeve and the needle core together during puncture, withdrawing the needle core after the sleeve is sent into the blood vessel, and only leaving the soft outer sleeve in the blood vessel for infusion.

Adopt traditional vein that connects through the syringe needle to keep somewhere the needle infusion back, the transfusion system needle tubing passes the plug that the needle needleless connector was kept somewhere to the vein, brings the colloid particle into infusion system easily, and pulls out the needle operation and cause blood reflux to keep somewhere the needle in a little improper easily, and the longer easy thrombus that forms of inflow time blocks up the hose on the one hand, and more serious condition does, if the thrombus gets into the human body and can cause the injury.

The positive pressure needleless connector is good in solving the problems, a positive pressure can be generated when the positive pressure needleless connector is pulled out, liquid in the connector is pushed into the infusion tube, so that blood is prevented from flowing back to the indwelling needle to form thrombus, but the top surface of the existing positive pressure connector is of an uneven structure in order to ensure liquid circulation, and the disinfection operation before the positive pressure connector is used is not thorough enough.

Disclosure of Invention

The utility model aims to solve the defects of the prior art and provides a blood return prevention indwelling needle with simple and reasonable structure and convenient use.

The utility model discloses a realize above-mentioned purpose, adopt following technical scheme: a blood return prevention indwelling needle comprises an indwelling needle body and a positive pressure device connected with the indwelling needle body, wherein the positive pressure device comprises a positive pressure shell, an outer valve core is arranged at the upper end of the inner side of the positive pressure shell, a vertical through hole penetrating through the top and bottom surfaces of the outer valve core is formed in the center of the outer valve core, an inner valve core is arranged in the through hole, the height of the inner valve core is smaller than that of the outer valve core, the diameter of the inner valve core is smaller than that of a transfusion tube, the outer diameter of the outer valve core is not smaller than that of the transfusion tube, a fixing plate is arranged at the bottom of the outer valve core, a through hole is formed in the center of the fixing plate, the diameter of the through hole is smaller than that of the through hole, a plurality of first springs are symmetrically connected between the bottom surface of the inner valve core and the fixing plate, a sleeve with an open top surface and a sealed bottom, a fluid channel is formed and is communicated with the lower end of the positive pressure shell, the other side walls of the sleeve are fixedly connected with the positive pressure shell in a sealing manner, the outer valve core penetrates through the top surface of the sleeve, a plurality of second springs are symmetrically connected and arranged between the bottom surface of the sleeve and the fixed plate, a plurality of vertical support rods are symmetrically arranged in the sleeve below the fixed plate, a vertical ejector rod is arranged in the sleeve right below the inner valve core, the height of each support rod is smaller than that of the ejector rod, two first flow channels are symmetrically formed in the side wall of the outer valve core, and two inclined U-shaped second flow channels are symmetrically formed in the side wall of the inner;

when the infusion tube is not in threaded connection with the upper end of the positive pressure shell, the top surfaces of the outer valve core, the inner valve core and the positive pressure shell are positioned on the same horizontal plane and sealed, and the outer valve core is sealed with the upper end of the sleeve; when the infusion tube is in threaded connection with the upper end of the positive pressure shell, the upper surface of the inner valve core is higher than that of the outer valve core, the upper edge part of the second flow channel is communicated with the infusion tube, the ejector rod penetrates through the through hole and is in contact with the inner valve core, the support rod is in contact with the fixed plate, the second spring is in a compressed state and the first spring is in a stretched state, the first flow channel, the second flow channel and the fluid channel are in one-to-one correspondence and are communicated, the outer valve core is sealed with the middle part of the sleeve, a space is formed between the outer valve core and the upper part;

a catheter with a heparin cap is arranged on one side of the positive pressure shell and is communicated with the fluid channel.

Preferably: keep somewhere the needle body and include hose and the connector of being connected with the hose, set up the plug in the connector, set up the pjncture needle that runs through the plug in the hose, be provided with the extension pipe in connector one side intercommunication, set up the extension pipe switch on the extension pipe, the lower extreme threaded connection of extension pipe and malleation casing.

Preferably: an included angle is formed between one side of the rubber plug, facing the hose, and the connecting hole formed by communicating the extension pipe with the connector is positioned between the hose and the rubber plug and is opposite to the obtuse angle formed by clamping the rubber plug and the hose.

Preferably: and the inner side and the outer side of the upper end of the outer valve core are respectively provided with a sealing ring sealed with the positive pressure shell and the inner valve core, the two ends of the first flow channel are respectively provided with a sealing ring sealed with the positive pressure shell and the inner valve core, and the periphery of the middle part of the outer valve core is provided with a sealing ring sealed with the sleeve.

Preferably: the upper edge part of the second flow channel is gradually inclined downwards along the direction from the outer side to the inner side, the lower edge part of the second flow channel is gradually inclined upwards along the direction from the outer side to the inner side, and the first flow channel is gradually inclined upwards along the direction from the outer side to the inner side.

The utility model has the advantages that: the utility model discloses in use malleation device, prevent to keep somewhere the interior blood return of needle after the infusion is accomplished, cause the thrombus to block up the pipeline and breed the bacterium harm patient healthy, its top surface of malleation casing is level and smooth structure when not being connected with the transfer line, is difficult for producing "dead angle" when adopting the cotton disinfection of alcohol, and the disinfection is thorough, does not keep hidden danger, and does not have "dead angle" in the tilting design assurance connector of plug, does not have during the washing of tubes and remains.

Drawings

FIG. 1 is a schematic structural view of the present invention in which the positive pressure shell is not connected to the infusion tube by screw threads;

FIG. 2 is a schematic structural view of the screw connection state of the positive pressure shell and the infusion tube of the present invention;

fig. 3 is a schematic structural view of the indwelling needle body of the present invention.

In the figure: 1-a positive pressure shell; 2-a transfusion tube; 3-an outer valve core; 4-a catheter; 5-inner valve core; 6-a first flow channel; 7-a second flow channel; 8, fixing a plate; 9-a second spring; 10-a top rod; 11-a fluid channel; 12-a first spring; 13-an extension tube; 14-extension tube switch; 15-a hose; 16-puncture needle; 17-a sleeve; 18-a rubber plug; 19-a connector; 20-support bar.

The following detailed description will be made in conjunction with embodiments of the present invention with reference to the accompanying drawings.

Detailed Description

The invention will be further explained with reference to the following figures and examples:

as shown in figures 1-3, the utility model comprises a remaining needle body and a positive pressure device connected with the remaining needle body, the positive pressure device comprises a positive pressure shell 1, an outer valve core 3 is arranged at the upper end of the inner side of the positive pressure shell 1, a vertical through hole penetrating the top bottom surface of the outer valve core 3 is arranged at the center of the outer valve core 3, an inner valve core 5 is arranged in the through hole, the height of the inner valve core 5 is smaller than that of the outer valve core 3, the diameter of the inner valve core 5 is smaller than that of a transfusion tube 2, the outer diameter of the outer valve core 3 is not smaller than that of the transfusion tube 2, a fixed plate 8 is arranged at the bottom of the outer valve core 3, a perforation is arranged at the center of the fixed plate 8, the diameter of the perforation is smaller than that of the through hole, a plurality of first springs 12 are symmetrically connected between the bottom surface of the inner valve core 5 and the fixed plate 8, a sleeve 17 with sealed bottom surface is arranged, a distance is reserved between one symmetrical side wall of the sleeve 17 and the positive pressure shell 1 to form a fluid channel 11, the fluid channel 11 is communicated with the lower end of the positive pressure shell 1, the other side walls of the sleeve 17 are fixedly connected with the positive pressure shell 1 in a sealing manner, the outer valve core 3 penetrates through the top surface of the sleeve 17, a plurality of second springs 9 are symmetrically connected between the bottom surface of the sleeve 17 and the fixed plate 8, a plurality of vertical support rods 20 are symmetrically arranged in the sleeve 17 below the fixed plate 8, vertical ejector rods 10 are arranged in the sleeve 17 right below the inner valve core 5, the height of each support rod 20 is smaller than that of each ejector rod 10, two first flow channels 6 are symmetrically arranged on the side wall of the outer valve core 3, and two inclined U-shaped second flow channels 7 are symmetrically arranged on the; when the infusion tube 2 is not in threaded connection with the upper end of the positive pressure shell 1, the top surfaces of the outer valve core 3, the inner valve core 5 and the positive pressure shell 1 are positioned on the same horizontal plane and sealed, and the outer valve core 3 is sealed with the upper end of the sleeve 17; when the infusion tube 2 is in threaded connection with the upper end of the positive pressure shell 1, the upper surface of the inner valve core 5 is higher than the outer valve core 3, the upper edge part of the second flow channel 7 is communicated with the infusion tube 2, the top surfaces of the inner valve core 5 and the outer valve core 3 are lower than the upper end surface of the positive pressure shell 1, the ejector rod 10 penetrates through the through hole and is in contact with the inner valve core 5, the support rod 20 is in contact with the fixing plate 8, the second spring 9 is in a compressed state and the first spring 12 is in a stretched state, the first flow channel 6, the second flow channel 7 and the fluid channel 11 are in one-to-one correspondence and communicated, the outer valve core 3 is sealed with the middle part of the sleeve 17, a space is formed between the outer valve core; a heparin-capped catheter 4 communicating with the fluid channel 11 is provided at one side of the positive pressure housing 1.

The utility model discloses a working process does: when the infusion tube 2 is connected with the external thread of the positive pressure shell 1 (the infusion tube 2 is provided with a fixing cap in threaded connection with the positive pressure shell 1 in a penetrating way), the infusion tube 2 presses the outer valve core 3 downwards, the outer valve core 3 and the inner valve core 5 are sealed and have friction with each other, so the inner valve core 5 moves downwards along with the outer valve core 3, the first spring 12 is in a relatively static state at the moment until the inner valve core 5 is propped by the ejector rod 10, the inner valve core 5 is separated from the outer valve core 3, the outer valve core 3 continues to move downwards until the outer valve core 3 is propped by the support rod 20, the upper end of the inner valve core 5 is inserted into the infusion tube 2 and is communicated with the infusion tube 2 through the upper edge part of the second flow passage 7, the first flow passage 6 and the flow passage 11 are communicated with each other, the infusion medicine flows into the indwelling needle body, the first spring 12 is in a stretching state at the moment, the second, under the effect of two spring forces, inner valve core 5 and outer valve core 3 move upwards simultaneously, and inner valve core 5 and outer valve core 3 are close to each other, and until inner valve core 5, outer valve core 3, the sealed closure of malleation casing 1 upper end three, liquid in the interval between outer valve core 3 and the sleeve 17 upper portion is squeezed into fluid passage 11 in this process, effectively prevents the blood return.

In this embodiment, the remaining needle body includes a hose 15 and a connector 19 connected with the hose 15, a rubber plug 18 is arranged in the connector 19, a puncture needle 16 penetrating through the rubber plug 18 is arranged in the hose 15, an extension tube 13 is communicated with one side of the connector 19, an extension tube switch 14 is arranged on the extension tube 13, and the extension tube 13 is in threaded connection with the lower end of the positive pressure shell 1. Considering that the traditional remaining needle body has a dead angle at the position of the rubber plug 18, liquid medicine or backflow blood is easy to remain during tube flushing, bacteria is easy to breed, and the two medicines are mixed and easily react. Therefore, in the utility model, the rubber plug 18 has an included angle between the side facing the hose 15 and the hose 15, and the connecting hole formed by the communication of the extension pipe 13 and the connector 19 is located between the hose 15 and the rubber plug 18 and is just right to the obtuse angle clamped by the rubber plug 18 and the hose 15.

In this embodiment, the sealing manner of each structure is as follows: the inner side and the outer side of the upper end of the outer valve core 3 are respectively provided with a sealing ring sealed with the positive pressure shell 1 and the inner valve core 5, the two ends of the first flow channel 6 are respectively provided with a sealing ring sealed with the positive pressure shell 1 and the inner valve core 5, the periphery of the middle part of the outer valve core 3 is provided with a sealing ring sealed with the sleeve 17, and the sealing ring in the middle part of the outer valve core 3 is sealed with the upper end of the sleeve 17 when the infusion tube 2 is in threaded connection with the positive pressure shell 1.

In order to improve the smoothness of the liquid flow, the upper edge of the second flow channel 7 is gradually inclined downward in the direction from the outer side to the inner side, the lower edge is gradually inclined upward in the direction from the outer side to the inner side, and the first flow channel 6 is gradually inclined upward in the direction from the outer side to the inner side.

The present invention has been described above with reference to the accompanying drawings, and it is obvious that the present invention is not limited by the above embodiments, and various improvements made by the method concept and technical solution of the present invention or directly applied to other occasions without improvement are all within the protection scope of the present invention.

Claims

1. The utility model provides a prevent blood return and keep somewhere needle which characterized in that: the positive pressure device comprises a remaining needle body and a positive pressure device connected with the remaining needle body, wherein the positive pressure device comprises a positive pressure shell (1), an outer valve core (3) is arranged at the upper end of the inner side of the positive pressure shell (1), a vertical through hole penetrating through the top bottom surface of the outer valve core (3) is formed in the center of the outer valve core (3), an inner valve core (5) is arranged in the through hole, the height of the inner valve core (5) is smaller than that of the outer valve core (3), the diameter of the inner valve core (5) is smaller than that of a liquid conveying pipe (2), the outer diameter of the outer valve core (3) is not smaller than that of the liquid conveying pipe (2), a fixing plate (8) is arranged at the bottom of the outer valve core (3), a through hole is formed in the center of the fixing plate (8), the diameter of the through hole is smaller than that of the through hole, a plurality of first springs (, The bottom surface of the sleeve is sealed, the axis of the sleeve (17) and the axis of the positive pressure shell (1) are collinear, the inner diameter of the sleeve (17) is larger than the outer diameter of the outer valve core (3), a symmetrical side wall of the sleeve (17) is spaced from the positive pressure shell (1) to form a fluid channel (11), the fluid channel (11) is communicated with the lower end of the positive pressure shell (1), the rest side walls of the sleeve (17) are fixedly connected with the positive pressure shell (1) in a sealing manner, the outer valve core (3) penetrates through the top surface of the sleeve (17), a plurality of second springs (9) are symmetrically connected between the bottom surface of the sleeve (17) and the fixed plate (8), a plurality of vertical support rods (20) are symmetrically arranged in the sleeve (17) below the fixed plate (8), vertical ejector rods (10) are arranged in the sleeve (17) under the inner valve core (5), the height of each support rod (20) is smaller than the ejector rods (10), two first flow channels, two inclined U-shaped second flow passages (7) are symmetrically formed in the side wall of the inner valve core (5);

when the infusion tube (2) is not in threaded connection with the upper end of the positive pressure shell (1), the top surfaces of the outer valve core (3), the inner valve core (5) and the positive pressure shell (1) are positioned on the same horizontal plane and sealed, and the outer valve core (3) is sealed with the upper end of the sleeve (17); when the infusion tube (2) is in threaded connection with the upper end of the positive pressure shell (1), the upper surface of the inner valve core (5) is higher than the outer valve core (3), the upper edge part of the second flow channel (7) is communicated with the infusion tube (2), the ejector rod (10) penetrates through the through hole and is in contact with the inner valve core (5), the support rod (20) is in contact with the fixing plate (8), the second spring (9) is in a compressed state, the first spring (12) is in a stretched state, the first flow channel (6), the second flow channel (7) and the fluid channel (11) are in one-to-one correspondence and communicated, the outer valve core (3) is sealed with the middle part of the sleeve (17), a gap is formed between the outer valve core (3) and the upper part of the sleeve (17), and the gap is communicated with the;

a catheter (4) which is communicated with the fluid channel (11) and is provided with a heparin cap is arranged on one side of the positive pressure shell (1).

2. The anti-flashback indwelling needle according to claim 1, wherein: the indwelling needle body comprises a hose (15) and a connector (19) connected with the hose (15), a rubber plug (18) is arranged in the connector (19), a puncture needle (16) penetrating through the rubber plug (18) is arranged in the hose (15), an extension pipe (13) is communicated and arranged on one side of the connector (19), an extension pipe switch (14) is arranged on the extension pipe (13), and the extension pipe (13) is in threaded connection with the lower end of the positive pressure shell (1).

3. The anti-flashback indwelling needle according to claim 2, wherein: an included angle is formed between one surface of the rubber plug (18) facing the hose (15) and the hose (15), and the connecting hole formed by communicating the extension pipe (13) and the connecting head (19) is positioned between the hose (15) and the rubber plug (18) and is opposite to an obtuse angle formed by clamping the rubber plug (18) and the hose (15).

4. The anti-flashback indwelling needle according to claim 3, wherein: and the inner side and the outer side of the upper end of the outer valve core (3) are respectively provided with a sealing ring sealed with the positive pressure shell (1) and the inner valve core (5), the two ends of the first flow channel (6) are respectively provided with a sealing ring sealed with the positive pressure shell (1) and the inner valve core (5), and the periphery of the middle part of the outer valve core (3) is provided with a sealing ring sealed with the sleeve (17).

5. The anti-flashback indwelling needle according to claim 4, wherein: the upper edge part of the second flow passage (7) is gradually inclined downwards along the direction from the outer side to the inner side, the lower edge part of the second flow passage is gradually inclined upwards along the direction from the outer side to the inner side, and the first flow passage (6) is gradually inclined upwards along the direction from the outer side to the inner side.