CN114053515A

CN114053515A - Continuous infusion clip-free remaining needle

Info

Publication number: CN114053515A
Application number: CN202010772693.1A
Authority: CN
Inventors: 朱大伟; 倪叶彬; 郭庆龙; 王红英; 周煜洁; 王艺凯; 葛鹏程; 郭金林; 张轶群
Original assignee: Shanghai Xier Medical Instrument Co ltd
Current assignee: Shanghai Xier Medical Instrument Co ltd
Priority date: 2020-08-06
Filing date: 2020-08-06
Publication date: 2022-02-18

Abstract

The technical scheme of the invention discloses a continuous infusion clip-free indwelling needle, which comprises a needle tube assembly, a hose and an infusion connector, wherein the infusion connector comprises an infusion connector main body and an infusion pump main body, a micro-flow assembly capable of generating continuous positive pressure micro-flow is installed in the infusion pump main body, and the micro-flow assembly converts liquid medicine injected from an inlet of the infusion pump main body into slow continuous positive pressure micro-flow to be output to an outlet of the infusion pump main body. The infusion pump realizes continuous generation of microflow with positive pressure for more than 24 hours by arranging the microflow component in the infusion pump, can meet the requirement of most patients on alternate-day infusion, thereby realizing that the catheter is always flushed by liquid medicines such as physiological saline and the like in the indwelling catheter during the infusion intermission period to prevent thrombus from being formed in the catheter, and the catheter does not need to be flushed and sealed by medical personnel at regular time, thereby effectively solving the problem of catheter blockage caused by blood backflow and solidification in the indwelling catheter.

Description

Continuous infusion clip-free remaining needle

Technical Field

The invention relates to the technical field of medical instruments, in particular to a continuous infusion clip-free remaining needle.

Background

The existing indwelling needles, central venous catheters, peripheral central venous catheters, infusion ports and other indwelling catheters are increasingly applied to the treatment of various clinical liquid medicine infusion, and can avoid the injury to patients caused by repeated puncture, greatly reduce the pain of patients in treating diseases and improve the nursing efficiency of medical staff.

However, the problem of catheter blockage caused by blood backflow and coagulation due to indwelling catheters has not been completely solved, and the main reasons include natural blood diffusion, pipeline pressure change (limb daily activities, sneezing and coughing, and baby shaking and crying), blood viscosity and improper catheter sealing for nursing staff, the former reasons are unavoidable factors, the latter reasons are even more factors consuming a large amount of medical resources to train the nursing staff, and operation errors cannot be completely avoided due to various reasons.

The invention aims to solve the problem that the infusion joint such as a heparin cap, a positive pressure joint and the like can not continuously generate positive pressure after the infusion pipeline is sealed, thereby thoroughly solving the problem that the indwelling catheter is blocked due to thrombus caused by blood backflow in the blood vessel, and the invention does not need nursing staff to have the tube sealing skill, simplifies the infusion process, and can reduce the uncomfortable feeling of the indwelling catheter of a patient without clamping the indwelling needle.

The existing clinical use only has a positive pressure joint which generates positive pressure at the moment when the syringe leaves the joint, lasts for about 2 seconds, has no positive pressure during the retention period, and cannot meet the requirement of infusion of most patients every other day.

In addition, the continuous positive pressure joint and the remaining needle related in the prior art are difficult to realize the marketization requirement due to the problems of functional defects, process problems, higher cost, overstaffed appearance and the like; the present invention solves all of the above problems.

Disclosure of Invention

The invention solves the problems of catheter blood return and blockage caused by the fact that various indwelling catheters such as the existing indwelling needle cannot continuously generate positive pressure after a transfusion pipeline is sealed.

In order to solve the technical problem, the technical scheme of the invention provides an infusion pump with a continuous positive pressure output function, which comprises an infusion pump main body, wherein a micro-flow assembly capable of generating continuous positive pressure micro-flow is installed in the infusion pump main body, and the micro-flow assembly converts liquid medicine injected from an inlet of the infusion pump main body into slow continuous positive pressure micro-flow and outputs the liquid medicine to an outlet of the infusion pump main body.

Optionally, the infusion pump main body is of a structure with a hollow inner cavity and two through ends, and comprises an outlet shell with an interface arranged therein and an inlet shell fixedly connected with the outlet shell; a clamping ring is arranged between the outlet shell and the inlet shell, the clamping ring divides the hollow inner cavity into a first inner cavity and a second inner cavity, and a dosing rubber plug with a cutting slit is arranged between the clamping ring and the inlet shell; the connector with the junction of export shell is equipped with export shell through-hole with lining up, the rand is equipped with the rand through-hole with lining up, import shell is equipped with import shell through-hole with lining up, export shell through-hole, first inner chamber, rand through-hole, the second inner chamber and communicate between the import shell through-hole.

Optionally, the microfluidic assembly includes a microporous tube having a through hole in a length direction, a support tube sleeved outside the microporous tube in a clearance fit manner, and an elastic tube sleeved outside the support tube and having two ends sealed with the support tube; a gap is formed between the supporting tube and the microporous tube, a plurality of supporting tube through holes are arranged on the side wall of the supporting tube in a penetrating manner, the left end outlet of the supporting tube is sealed with the microporous tube, and the supporting tube through holes, the gap and the right end outlet of the supporting tube are communicated;

the connector is provided with a through mounting hole, two ends of the elastic tube, the supporting tube and the microporous tube are respectively mounted in the mounting hole and the retainer ring, right end ports of the elastic tube, the supporting tube and the microporous tube are flush, the right end of the elastic tube is in interference fit with the retainer ring, and the left end of the microporous tube extends out of the left end of the supporting tube and is in interference fit with the mounting hole;

the position of the clamping ring connected with the microporous tube is provided with a clamping ring liquid injection port, the through hole, the clamping ring liquid injection port and the cutting seam are communicated, and the inner cavity of the elastic tube, the supporting tube through hole, the gap, the clamping ring liquid injection port and the cutting seam are communicated.

Optionally, the microfluidic assembly includes a support tube having a through hole in a length direction, an elastic tube sleeved outside the support tube and having two ends sealed with the support tube, a pair of sealing gaskets located at a left side of the support tube, and a microporous sheet located between the pair of sealing gaskets, wherein a plurality of support tube through holes are formed through a side wall of the support tube;

the connector is provided with a through mounting hole, the sealing gasket, the microporous sheet, the left end of the supporting tube and the left end of the elastic tube are mounted in the mounting hole, the elastic tube is in interference fit with the mounting hole, the right end of the supporting tube and the right end of the elastic tube are mounted in the retainer ring, the elastic tube is in interference fit with the retainer ring, and a retainer ring liquid injection port is formed in the position, connected with the elastic tube, of the retainer ring;

the installation hole, the micropore of the micropore sheet, the through hole, the collar liquid injection port and the cutting seam are communicated, and the inner cavity of the elastic tube, the supporting tube through hole, the collar liquid injection port and the cutting seam are communicated.

Optionally, the microflow structure include have the micropore pipe of perforating hole in length direction, install respectively in the import connecting seat and the export connecting seat at micropore pipe both ends and both ends respectively with import connecting seat with the elasticity pipe that the export connecting seat is connected, install respectively in the import rand and the export rand of elasticity pipe, the export connecting seat has the mounting hole that link up, the micropore pipe with export connecting seat mounting hole sealing connection, import connecting seat with micropore pipe clearance fit, the elasticity pipe both ends have the flange structure, are located import connecting seat one end the flange of elasticity pipe passes through import rand extrusion seal is fixed, is located export connecting seat one end the flange of elasticity pipe with the export rand is fixed through extrusion seal. In addition the export shell inner wall is equipped with the rib, and it can play the effect of the first inner chamber front and back part of intercommunication after the elasticity pipe inflation adherence, import connecting seat and import rand are equipped with the exhaust hole, and it can communicate first inner chamber and second inner chamber to and communicate import shell through-hole.

Optionally, a micro-wire is disposed in the through hole of the micro-hole tube, and the micro-wire and the wall of the micro-hole tube form a micro through gap.

In order to solve the technical problem, the technical scheme of the invention further provides an infusion connector, wherein the infusion connector comprises an infusion connector body and an infusion pump body, and the infusion pump is any one of the infusion pumps with the continuous positive pressure output function.

Optionally, the infusion connector body comprises an infusion connector body shell and a piston structure arranged in the infusion connector body shell, the upper end of the infusion connector body shell is opened and forms a female luer, and a connecting pipe through hole is formed in the side wall of the infusion connector body shell; the piston structure comprises a piston rod which is arranged in the infusion connector main body shell and is close to the female luer interface, a sealing ring is arranged between the piston rod and the infusion connector main body shell, a spring is arranged at the bottom of the piston rod, and two ends of the spring are respectively abutted against the bottom of the piston rod and a limiting pad arranged at the inner bottom of the infusion connector main body shell.

In order to solve the technical problem, the technical scheme of the invention also provides a continuous infusion remaining needle, which comprises a needle tube assembly, a hose, a flow stopping clip and an infusion connector which are sequentially connected, wherein the infusion connector is the infusion connector.

In addition, the continuous infusion clip-free indwelling needle comprises a needle tube component, a hose and an infusion connector which are sequentially connected, wherein the infusion connector is the infusion connector.

The technical scheme of the invention has the beneficial effects that:

the infusion pump realizes continuous generation of micro flow with positive pressure for more than 24 hours by arranging the micro flow component in the infusion pump, and can completely meet the requirement of most patients on alternate-day infusion, so that liquid medicines such as physiological saline and the like are always flushed in the indwelling catheter during the infusion intermittent period to prevent thrombus from being formed in the indwelling catheter, medical staff is not required to flush and seal the catheter regularly, and the problem of blockage caused by backflow and solidification of blood in the indwelling catheter is effectively solved.

Drawings

FIG. 1 is a schematic diagram of an infusion pump according to a first embodiment of the present invention;

FIG. 2 is a cross-sectional view of an infusion pump in accordance with one embodiment of the present invention;

FIG. 3 is a cross-sectional view of an infusion pump in accordance with a second embodiment of the present invention;

FIG. 4 is a cross-sectional view of an infusion pump in accordance with a third embodiment of the present invention;

FIG. 5 is a cross-sectional view of an infusion pump in accordance with a fourth embodiment of the present invention;

FIG. 6 is a schematic structural view of an infusion connector in accordance with a fifth embodiment of the present invention;

FIG. 7 is a cross-sectional view of FIG. 6;

FIG. 8 is a schematic view showing the installation of an infusion connector and an indwelling needle in the fifth embodiment of the present invention;

FIG. 9 is a schematic structural view of an infusion connector in accordance with a sixth embodiment of the present invention;

FIG. 10 is a cross-sectional view of FIG. 9;

FIG. 11 is a schematic view of the general installation of the infusion pump and the indwelling needle in the first, second, third and fourth embodiments of the present invention;

FIG. 12 is a view showing a state of use of an infusion connector in accordance with a sixth embodiment of the present invention;

FIG. 13 is a view showing another state of use of an infusion connector in accordance with a sixth embodiment of the present invention;

FIG. 14 is a schematic view showing the installation of an infusion connector and an indwelling needle in the seventh embodiment of the present invention;

FIG. 15 is a cross-sectional view of FIG. 14;

FIG. 16 is a schematic view showing the installation of an infusion connector and an indwelling needle in an eighth embodiment of the present invention;

FIG. 17 is a cross-sectional view of FIG. 16;

FIG. 18 is a sectional view of an infusion connector in an eighth embodiment of the present invention;

FIG. 19 is a schematic view showing the installation of an infusion connector and an indwelling needle in accordance with the ninth embodiment of the present invention;

FIG. 20 is a cross-sectional view of FIG. 19;

FIG. 21 is a cross-sectional view of an infusion connector in a ninth embodiment of the invention;

FIG. 22 is a perspective view of an infusion connector in a ninth embodiment of the invention;

fig. 23 is an enlarged view at a in fig. 22.

The specific implementation mode is as follows:

the invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

Example one

Referring to fig. 1, 2 and 11, an embodiment of an infusion pump 100 with continuous positive pressure output function is shown, wherein the infusion pump includes an infusion pump body, a microfluidic assembly capable of generating continuous positive pressure microflow is installed in the infusion pump body, and the microfluidic assembly converts a liquid medicine injected from an inlet of the infusion pump body into slow continuous positive pressure microflow to be output to an outlet of the infusion pump body.

As shown in fig. 2, in the present embodiment, the infusion pump body has a hollow inner cavity and a structure with two ends penetrating through, and includes an outlet housing 2 with a hub 205 (in the present embodiment, the hub 205 is preferably a male luer) inside, and an inlet housing 1 fixedly connected to the outlet housing 2; a clamping ring 6 is arranged between the outlet shell 2 and the inlet shell 1, the clamping ring 6 divides the hollow inner cavity into a first inner cavity 200 and a second inner cavity 300, and a dosing rubber plug 7 with a cutting slit 701 is arranged between the clamping ring 6 and the inlet shell 1; an outlet shell through hole 201 is arranged at the joint of the interface 205 and the outlet shell 2 in a penetrating manner, a clamping ring through hole 601 is arranged at the clamping ring 6 in a penetrating manner, an inlet shell through hole 101 is arranged at the inlet shell 1 in a penetrating manner, and the outlet shell through hole 201, the first inner cavity 200, the clamping ring through hole 601, the second inner cavity 300 and the inlet shell through hole 101 are communicated with each other.

In this embodiment, the microfluidic assembly includes a microporous tube 5 having a through hole 501 in a length direction, a support tube 4 sleeved outside the microporous tube 5 in a clearance fit manner, and an elastic tube 3 sleeved outside the support tube 4 and having two ends sealed with the support tube 4 (in an inflated state); a gap 451 is formed between the support tube 4 and the microporous tube 5, a plurality of support tube through holes 401 are arranged on the side wall of the support tube 4 in a penetrating mode, the left end outlet of the support tube 4 is sealed with the microporous tube 5, and the support tube through holes 401, the gap 451 and the right end outlet of the support tube 4 are communicated.

Interface 205 has the mounting hole 2051 that link up, and the both ends of elasticity pipe 3 (sufficient state), stay tube 4 and micropore pipe 5 are installed respectively in mounting hole 2051, rand 6, and the right-hand member mouth of elasticity pipe 3 (sufficient state), stay tube 4 and micropore pipe 5 flushes, and the right-hand member of elasticity pipe 3 (sufficient state) and 6 interference fit of rand, the left end that the left end of micropore pipe 5 stretched out stay tube 4 and with mounting hole 2051 interference fit.

The collar 6 is provided with a collar injection port 602 at the position connected with the microporous tube 5, the through hole 501, the collar injection port 602 and the cutting slit 701 are communicated, and the inner cavity of the elastic tube 3 (in a filling state), the support tube through hole 401, the gap 451, the collar injection port 602 and the cutting slit 701 are communicated.

When the injector is inserted into the inlet shell 1 to extrude the dosing rubber plug 7, the cutting seam 701 of the dosing rubber plug 7 is opened, the liquid medicine flows into the inner cavity of the elastic tube 3 (in the filling state) from the collar liquid injection port 602-gap 451-supporting tube through hole 401, when the injector is pulled out, the cutting seam 701 is restored and sealed, at the moment, the inner cavity of the elastic tube 3 (in the filling state) generates inward contraction force due to the expansion and enlargement of the volume after the liquid medicine is injected, and the contraction force enables the liquid medicine in the inner cavity of the elastic tube 3 (in the filling state) to flow out from the left outlet end of the microporous tube 5 through the supporting tube through hole 401-gap 451-collar liquid injection port 602-through hole 501, so that the slow and continuous outflow of the liquid medicine is realized.

As shown in fig. 11, the present embodiment discloses an indwelling needle, which comprises a needle tube assembly 17, a flexible tube 15, a flow stopping clip 16 mounted on the flexible tube, an infusion connector 20 and an infusion pump 100, which are connected in sequence, wherein the infusion pump 100 is the infusion pump with continuous positive pressure output function.

Example two

Referring to fig. 1, 3 and 11, an infusion pump with continuous positive pressure output function is shown, in which the structure of the microfluidic assembly in the infusion pump 100 of the second embodiment is substantially the same as that of the first embodiment, except that a micro-wire 14 is disposed in a through hole 501 of a micro-hole tube 5 of the second embodiment, and the micro-wire 14 and the through hole 501 form a micro-through gap. The working principle of the second embodiment is the same as that of the first embodiment, and is not described herein again.

In this embodiment, a micro-wire 14 is inserted into the through hole 501 of the micro-hole tube 5 in the ordinary mechanical infusion pump, and the cross-sectional area of the flow path of the through hole 501 is further reduced by the micro-wire 14, so that the control of continuous positive pressure micro-flow with smaller flow rate is realized.

EXAMPLE III

Referring to fig. 1, 4 and 11, an infusion pump with continuous positive pressure output function is shown, in which the structure of the microfluidic component in the infusion pump 100 of the third embodiment is different from that of the first and second embodiments, and the structure of the infusion pump 100 is described in detail below.

In this embodiment, the microfluidic assembly includes a support tube 4 having a through hole 402 in a longitudinal direction, an elastic tube 3 (in an inflated state) sleeved outside the support tube 4 and having both ends sealed with the support tube 4, a pair of gaskets 18 positioned on a left side of the support tube 4, and a microporous sheet 19 having a through microporous 191 between the pair of gaskets 18, and a plurality of support tube through holes 401 are provided through a side wall of the support tube 4.

Interface 205 has mounting hole 2051 that link up, sealed pad 18, micropore thin slice 19, the left end of stay tube 4 and the left end of elastic tube 3 (full state) are installed in mounting hole 2051, and elastic tube 3 (full state) and mounting hole 2051 interference fit, the right-hand member of stay tube 4 and the right-hand member of elastic tube 3 (full state) are installed in rand 6, and elastic tube 3 (full state) and rand 6 interference fit, rand liquid injection mouth 602 has been seted up to rand 6 in the position department of connecting elastic tube 3 (full state).

The mounting hole 2051, the micropore 191, the through hole 402, the collar filling port 602 of the microporous sheet 19, and the slit 701 communicate with each other, and the lumen of the elastic tube 3 (in the inflated state), the support tube through hole 401, the through hole 402, the collar filling port 602, and the slit 701 communicate with each other.

When the injector is inserted into the inlet shell 1 to extrude the dosing rubber plug 7, the cutting seam 701 of the dosing rubber plug 7 is opened, the liquid medicine flows into the inner cavity of the elastic tube 3 (in the filling state) from the collar injection port 602-the through hole 402-the support tube through hole 401, when the injector is pulled out, the cutting seam 701 is restored and sealed, at the moment, the inner cavity of the elastic tube 3 (in the filling state) generates inward contraction force due to the volume expansion and the enlargement after the liquid medicine is injected, and the contraction force enables the liquid medicine in the inner cavity of the elastic tube 3 (in the filling state) to flow out from the left outlet end of the microporous sheet 19 through the support tube through hole 401-the through hole 402-the micropores 191, so that the slow continuous outflow of the liquid medicine is realized.

Example four

Referring to fig. 1, 5 and 11, an infusion pump with continuous positive pressure output function is shown in an embodiment, wherein a microfluidic mounting structure of an infusion pump 100 in a fourth embodiment is different from that in the first, second and third embodiments, and the structure of the infusion pump 100 is described in detail below.

The microflow structure comprises a microporous tube 5 with a through hole 501 in the length direction, a microwire 14 arranged in the microporous tube, an inlet connecting seat 23 and a male luer 205 which are respectively arranged at two ends of the microporous tube 5, an elastic tube 3 (in a filling state) with two ends respectively connected with the inlet connecting seat 23 and the male luer 205, an inlet clamping ring 22 and an outlet clamping ring 21 which are respectively arranged at the elastic tube 3 (in the filling state), wherein the male luer 205 is provided with a through mounting hole, the microporous tube 5 is in sealing connection with the mounting hole of the male luer 205, the inlet connecting seat 23 is in clearance fit with the microporous tube 5, two ends of the elastic tube 3 (in the filling state) are provided with a flange 301 structure, and the flange 301 of the elastic tube 3 (in the filling state) at one end of the inlet connecting seat 23 is pressed, sealed and fixed by the inlet clamping ring 22, the flange 301 of the resilient tube 3 (in the inflated state) at one end of the male luer 205 is secured in a compression-tight manner to the outlet collar 21.

The inner wall of the outlet housing 2 is provided with ribs 210 which can play a role in communicating the front part and the rear part of the first inner cavity 200 after the elastic tube 3 expands to adhere to the wall, the inlet connecting seat 23 is provided with a through hole 230, the inlet clamping ring is provided with a through hole 220, and the connecting seat through hole 230 can be communicated with the first inner cavity 200 and the second inner cavity 300 through the inlet clamping ring through hole 220 and communicated with the inlet housing through hole 101.

When the injector inserts the extrusion medicine adding rubber plug 7 from the inlet shell 1 to open the cutting seam 701 of the medicine adding rubber plug 7, the liquid medicine enters the gap between the inlet connecting seat and the microporous tube from the liquid injection port 231 of the inlet connecting seat, then directly flows into the inner cavity of the elastic tube 3 (in the filling state), when the injector is pulled out, the cutting seam 701 is restored and sealed, at the moment, the inner cavity of the elastic tube 3 (in the filling state) generates inward contraction force due to the volume expansion and enlargement after the liquid medicine is injected, the contraction force enables the liquid medicine in the inner cavity of the elastic tube 3 (in the filling state) to flow out from the left outlet end of the microporous tube 5 through the gap between the inlet connecting seat and the microporous tube, namely the gap between the liquid injection port 231-through hole 501 of the inlet connecting seat and the microfilament 14, and therefore the slow continuous outflow of the liquid medicine is realized.

It is noted that the details of materials, dimensions, functions, etc. of the first, second, third, and fourth embodiments are as follows.

The elastic tube 3 (in the filling state) is made of elastic materials such as silica gel, rubber or latex, the support tube 4 is made of polymers or metal materials such as PC, PVC or stainless steel, the microporous tube 5 is made of polymers or metal materials such as PVC, PC, glass or stainless steel, the microwire 14 is made of polymers or metal materials such as PC, PVC, nylon, PTFE, PEEK, nickel-titanium alloy or stainless steel, and the microporous sheet 19 is made of polymers or metal materials such as PC, PVC, nylon, PTFE, PEEK, glass, nickel-titanium alloy or stainless steel.

The section shape of the pore of the micropore can be round, oval, square and polygon, and the section shape of the microwire can be round, oval, square and polygon.

The diameter of the round micropore pipe 5 is 0.01-1mm, the length is 1-50mm, the diameter of the round micro-filament 14 is 0.01-1mm, the length is 1-50mm, the diameter of the micropore 191 of the micropore sheet 19 is 0.001-0.01mm, and the thickness of the micropore sheet 19 is 0.01-1 mm.

The inner cavity of the elastic tube 3 (in the filling state) can store 0.05-5ml of liquid medicine.

The duration of the positive pressure of infusion pump 100 is 8-168 hours, preferably 24-72 hours.

It is noted that in one to four embodiments, i.e. in fig. 2 to 4, at the inlet end of the collar 6 a liquid medicine filter membrane 24 is mounted for filtering out impurities.

EXAMPLE five

Referring to fig. 6, 7 and 8, an infusion connector of an infusion pump with continuous positive pressure output function is shown, which comprises an infusion pump 100 and an infusion connector body fixedly connected with the infusion pump, wherein the upper end of the infusion connector body is designed to be a female luer 202, and the lower end of the infusion connector body is designed to be a male luer 205, the infusion connector can be connected to a common infusion pipeline (as shown in fig. 8) in general, and can realize the normal infusion of the pipeline and the continuous circulation of intermittent pipelines, such as interfaces connected to a venous indwelling needle, a central venous catheter and a peripheral central venous catheter. It should be noted that the main structure of the infusion pump 100 in this embodiment is not changed and the specific working principle is the same as that of the first, second, third and fourth embodiments, which is not described herein again.

EXAMPLE six

Referring to fig. 9, 10, 12 and 13, an infusion connector of an infusion pump with continuous positive pressure output function is shown, wherein, in the infusion pump 100 of the present embodiment, an outlet housing 2 is provided with an infusion connector main body, the infusion connector main body is a T-shaped structure, specifically, the upper end of an infusion connector main body housing 8 is provided with a female luer 202, one side is provided with a male luer 205, the other side is connected with the outlet housing 2, a piston rod 9 is arranged inside the infusion connector main body housing 8, the piston rod 9 is thin and thick, a sealing ring 10 is respectively arranged at the upper end and the lower end, a spring 11 is arranged inside the piston rod 9, the other end of the spring 11 is abutted against a limit pad 12, the limit pad 12 is fixedly connected with the lower end of the infusion connector main body housing 8, when a syringe is abutted with the female luer 202, an injection head of the syringe pushes the piston rod 9 to move downwards and compress the spring 11, the tube can be opened to inject the liquid medicine, when the syringe is separated from the female luer 202, the piston rod 9 rebounds through the spring 11 to seal the female luer 202, and positive pressure is generated. When the liquid medicine is injected by the infusion pump 100 and flows into the inner cavity 81 of the infusion connector main body casing 8, the liquid medicine flows into the indwelling needle hose connected with the infusion connector main body casing.

The infusion joint is connected into an infusion pipeline to realize normal infusion of the pipeline, positive pressure separation after flushing and continuous circulation of the pipeline in an intermittent period, such as connection to a venous indwelling needle, a central venous catheter (shown in figure 12) and a port passing through a peripheral central venous catheter (shown in figure 13). The main structure of the infusion pump 100 is unchanged and the specific working principle is the same as that of the first, second, third and fourth embodiments, which are not described herein again.

EXAMPLE seven

Referring to fig. 14 and 15, an infusion connector of an infusion pump with a continuous positive pressure output function is shown, wherein an infusion pump 100 is integrated with an infusion connector 20, the infusion connector 20 is designed in a structure that one end is a female luer 202 and the other end is a connecting tube through hole 204, the connecting tube through hole 204 can be bonded to one end of a hose 15, the other end of the hose 15 is bonded to a needle tube assembly 17 (as shown in fig. 14) of an indwelling needle, and a flow stopping clip 16 is arranged in the middle of the hose 15, so that the novel continuous positive pressure indwelling needle is a new type. The main structure of the infusion pump 100 is unchanged and the specific working principle is the same as that of the first, second and third embodiments, which are not described herein again.

The first to seventh embodiments are all configured to be connected to an indwelling needle, and the indwelling needle has a structure in which a fluid stopping clip 16 is provided on a flexible tube 15 of the indwelling needle, and mainly includes a needle tube assembly 17, a flexible tube 15, a fluid stopping clip 16, and an infusion connector 20, which are used in combination with (an infusion pump 100/an infusion connector integrally formed with the infusion pump 100/an infusion connector combined with the infusion pump 100 through an infusion connector main body case 8). While the eighth and ninth embodiments below are applied by combining the infusion connector with the structure of the infusion pump 100 with the indwelling needle, and the structures of the flow stopping clip 16 and the infusion connector 20 are omitted, the structure and the working principle of the infusion pump 100 are the same as those of the first to seventh embodiments, and therefore, the working principle is not described again.

Example eight

Referring to fig. 16, 17 and 18, an infusion connector with a continuous positive pressure output function is shown, wherein an infusion pump 100 of the present embodiment is connected with an infusion connector main body, the infusion connector main body comprises an infusion connector main body casing 8 and a piston structure arranged in the infusion connector main body casing 8, the upper end of the infusion connector main body casing 8 is open and forms a female luer 202, and a connecting pipe through hole 802 is formed on the side wall of the infusion connector main body casing 8; the piston structure is including establishing the piston rod that is close to female luer 202 department in arranging infusion joint main part shell 8 in, 9 installation sealing washer 10 between piston rod 9 and the infusion joint main part shell 8, the bottom installation spring 11 of piston rod 9, the both ends of spring 11 support respectively and lean on the bottom of piston rod 9 and install in the spacing pad 12 of the interior bottom of infusion joint main part shell 8, will take over through-hole 802 bonding hose 15 one end, the hose 15 other end bonds the needle tubing assembly 17 of remaining the needle, the centre need not the stagnant flow and presss from both sides, this is that another kind of novel continuous infusion does not press from both sides the needle of remaining. The main structure of the infusion pump 100 is unchanged and the specific working principle is the same as that of the first, second, third and fourth embodiments, which are not described herein again.

Example nine

Referring to fig. 19, 20, 21, 22 and 23, an infusion connector with continuous positive pressure output function is shown, wherein the outlet housing 2 of the infusion pump 100 of the present embodiment is designed to realize two infusion connection interface structures, which are symmetrical up and down, and the infusion interface of the present embodiment is a symmetrical structure, so that it is sufficient to describe the structure of one end without hindering the understanding of the specific symmetrical structure, as shown in fig. 19 to 23, specifically, a piston cavity 208 is provided at the middle position thereof, a spring 11 and a piston 9 are placed in the piston cavity, a sealing ring 10 is placed at each of the upper and lower ends of the piston 9, the piston cavity 208 can be communicated with an exhaust hole 206 of the outlet housing 2 to realize exhaust and suction during the movement of the piston 9, then a flow channel cavity 209 is designed at the outer ring of the piston cavity 208, the flow channel cavities 209 communicating up and down can be communicated through a communication hole 207, one side of the infusion pump 100 is communicated with the microporous tube 5, the other side of the infusion pump is communicated with the hose 15, the outlet shell 2 is respectively provided with a female luer connector 202 up and down, the needleless connection principle and the positive pressure principle of the infusion pump are the same as those of the fifth embodiment and the seventh embodiment, the other end of the hose 15 is bonded with the needle tube component 17 of the indwelling needle, no flow stopping clamp is needed in the middle, and the infusion pump 100 with the symmetrical structure can be connected with two infusion pipelines, which is a novel sustained infusion non-clamp indwelling needle. The main structure of the infusion pump 100 is unchanged and the specific working principle is the same as that of the first, second and third embodiments, which are not described herein again.

In conclusion, the infusion pump disclosed by the invention has the advantages that the micro flow component is arranged in the infusion pump, micro flow capable of continuously generating positive pressure for more than 24 hours is realized, and the requirement of most patients on alternate-day infusion can be completely met, so that liquid medicines such as physiological saline and the like are always flushed in the indwelling catheter during the infusion intermission period to prevent thrombus from being formed in the catheter, the catheter is not required to be flushed and sealed at regular time by medical personnel, and the problem of catheter blockage caused by blood backflow and solidification in the indwelling needle tube or other infusion tubes is effectively solved.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.

Claims

1. An infusion pump with a continuous positive pressure output function is characterized by comprising an infusion pump body, wherein a micro-flow component capable of generating continuous positive pressure micro-flow is installed in the infusion pump body, and the micro-flow component converts liquid medicine injected from an inlet of the infusion pump body into slow continuous positive pressure micro-flow and outputs the liquid medicine to an outlet of the infusion pump body.

2. The infusion pump with continuous positive pressure output function according to claim 1, wherein the infusion pump body is a structure with a hollow inner cavity and two through ends, and comprises an outlet shell with an interface arranged therein and an inlet shell fixedly connected with the outlet shell; a clamping ring is arranged between the outlet shell and the inlet shell, the clamping ring divides the hollow inner cavity into a first inner cavity and a second inner cavity, and a dosing rubber plug with a cutting slit is arranged between the clamping ring and the inlet shell; the connector with the junction of export shell is equipped with export shell through-hole with lining up, the rand is equipped with the rand through-hole with lining up, import shell is equipped with import shell through-hole with lining up, export shell through-hole, first inner chamber, rand through-hole, the second inner chamber and communicate between the import shell through-hole.

3. The infusion pump with continuous positive pressure output function according to claim 2, wherein the microfluidic assembly comprises a microporous tube with a through hole in the length direction, a supporting tube sleeved outside the microporous tube in a clearance fit manner, and an elastic tube sleeved outside the supporting tube and having two ends sealed with the supporting tube; a gap is formed between the supporting tube and the microporous tube, a plurality of supporting tube through holes are arranged on the side wall of the supporting tube in a penetrating manner, the left end outlet of the supporting tube is sealed with the microporous tube, and the supporting tube through holes, the gap and the right end outlet of the supporting tube are communicated;

4. The infusion pump with continuous positive pressure output function according to claim 2, wherein the microfluidic assembly comprises a support tube with a through hole in the length direction, an elastic tube sleeved outside the support tube and having two ends sealed with the support tube, a pair of sealing gaskets at the left side of the support tube, and a microporous sheet located between the pair of sealing gaskets, wherein a plurality of support tube through holes are arranged on the side wall of the support tube;

5. The infusion pump with continuous positive pressure output function according to claim 2, the micro-flow structure comprises a micro-hole tube with a through hole in the length direction, an inlet connecting seat and an outlet connecting seat which are respectively arranged at two ends of the micro-hole tube, an elastic tube with two ends respectively connected with the inlet connecting seat and the outlet connecting seat, an inlet clamping ring and an outlet clamping ring which are respectively arranged on the elastic tube, the outlet connecting seat is provided with a through mounting hole, the microporous tube is hermetically bonded with the outlet connecting seat mounting hole, the inlet connecting seat with micropore pipe clearance fit, the elastic tube both ends have flange structure, are located inlet connecting seat one end the flange of elastic tube passes through the extrusion of import rand is sealed fixed, is located outlet connecting seat one end the flange of elastic tube with the export rand passes through the extrusion and seals fixed.

The outlet shell inner wall is equipped with a plurality of ribs, and it can play the effect of part around the first inner chamber of intercommunication after the elasticity pipe inflation adherence, import connecting seat and import rand are equipped with the exhaust hole, and it can communicate first inner chamber and second inner chamber to and communicate inlet shell through-hole.

6. The infusion pump with continuous positive pressure output function according to claim 5, wherein a micro-wire is arranged in the through hole of the micro-hole tube, and the micro-wire and the wall of the micro-hole tube form a micro-through gap.

7. An infusion connector, comprising an infusion connector body and an infusion pump body, wherein the infusion pump is the infusion pump with continuous positive pressure output function in any claim 1-6.

8. The infusion connector according to claim 7, wherein the infusion connector body comprises an infusion connector body housing and a piston structure arranged in the infusion connector body housing, the infusion connector body housing is open at the upper end and forms a female luer, and a connecting pipe through hole is formed on the side wall of the infusion connector body housing; the piston structure comprises a piston rod which is arranged in the infusion connector main body shell and is close to the female luer interface, a sealing ring is arranged between the piston rod and the infusion connector main body shell, a spring is arranged at the bottom of the piston rod, and two ends of the spring are respectively abutted against the bottom of the piston rod and a limiting pad arranged at the inner bottom of the infusion connector main body shell.

9. A continuous infusion remaining needle, which is characterized by comprising a needle tube component, a flow stopping clip, a hose and an infusion connector which are connected in sequence, wherein the infusion connector is the infusion connector in claim 7 or 8.

10. A continuous infusion clip-free indwelling needle, which is characterized by comprising a needle tube component, a hose and an infusion connector which are connected in sequence, wherein the infusion connector is the infusion connector of claim 7 or 8.