A continuous infusion clipless indwelling needle

Abstract

The technical solution of the present invention discloses a continuous infusion clampless indwelling needle, including a needle tube assembly, a hose and an infusion connector, wherein the infusion connector includes an infusion connector body and an infusion pump body, and the infusion pump body is equipped with a microfluidic component that can generate continuous positive pressure microflow, and the microfluidic component converts the liquid medicine injected from the inlet of the infusion pump body into a slow continuous positive pressure microflow and outputs it to the outlet of the infusion pump body. The infusion pump of the present invention realizes the microflow that can continuously generate positive pressure for more than 24 hours by arranging a microfluidic component internally, which can meet the needs of most patients for infusion every other day, so that during the intermittent period of infusion, the indwelling catheter is always flushed with saline or other liquid medicine to prevent the formation of thrombus in the blood vessel, and there is no need for medical staff to flush and seal the tube regularly, which effectively solves the problem of catheter blockage caused by blood reflux and coagulation in the indwelling catheter.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a continuous infusion clampless indwelling needle. Background Art

[0002] Existing indwelling catheters, such as central venous catheters, peripherally inserted central venous catheters and infusion ports, are increasingly used in the treatment of various clinical drug infusions, because they can avoid the harm caused by repeated punctures to patients, greatly reduce the pain of patients in treating diseases, and improve the nursing efficiency of medical staff.

[0003] However, the problem of catheter blockage caused by blood reflux and coagulation due to indwelling catheters has not been completely solved. The main reasons are the natural diffusion of blood, changes in pipeline pressure (daily limb activities, sneezing and coughing, and hyperactivity and crying of babies), blood viscosity, and improper sealing of the tube by nursing staff. The former reasons are unavoidable factors, and the latter consumes a lot of medical resources to train nursing staff. However, operational errors cannot be completely avoided due to various reasons.

[0004] The present invention aims to solve the problem that the above-mentioned infusion connectors such as heparin caps and positive pressure connectors cannot continuously generate positive pressure after the infusion pipeline is sealed, thereby completely solving the problem of blood reflux in the blood vessels of the indwelling catheter causing blockage by thrombosis, and does not require nursing staff to have tube sealing skills, simplifying the infusion process. In addition, the clampless indwelling needle can reduce the patient's discomfort caused by the indwelling catheter.

[0005] In current clinical use, positive pressure connectors only generate positive pressure at the moment the syringe leaves the connector, which lasts for about 2 seconds. There is no positive pressure during the retention period, which cannot meet the needs of most patients for infusion every other day.

[0006] Furthermore, the continuous positive pressure connector and indwelling needle involved in the prior art are difficult to meet market demand due to functional defects, process problems, high costs, bulky appearance and other problems; the present invention solves all of the above problems. Summary of the invention

[0007] The invention solves the problem of catheter blood return and blockage caused by the inability of existing indwelling needles and other indwelling catheters to continuously generate positive pressure after the infusion pipeline is sealed.

[0008] In order to solve the above-mentioned technical problems, the technical solution of the present invention provides an infusion pump with a continuous positive pressure output function, which includes an infusion pump body, in which a microfluidic component that can generate a continuous positive pressure microflow is installed. The microfluidic component converts the drug solution injected from the inlet of the infusion pump body into a slow continuous positive pressure microflow and outputs it to the outlet of the infusion pump body.

[0009] Optionally, the infusion pump body has a structure with a hollow inner cavity and through-connected at both ends, and the infusion pump body includes an outlet shell with an interface provided therein and an inlet shell fixedly connected to the outlet shell; a clamp ring is installed between the outlet shell and the inlet shell, and the clamp ring divides the hollow inner cavity into a first inner cavity and a second inner cavity, and a medicated rubber plug with a self-cut slit is installed between the clamp ring and the inlet shell; an outlet shell through hole is provided at the connection between the interface and the outlet shell, the clamp ring is provided with a clamp ring through hole, and the inlet shell is provided with an inlet shell through hole, and the outlet shell through hole, the first inner cavity, the clamp ring through hole, the second inner cavity and the inlet shell through hole are connected.

[0010] Optionally, the microfluidic component includes a microporous tube having a through hole in the length direction, a support tube sleeved outside the microporous tube with a clearance fit, and an elastic tube sleeved outside the support tube and sealed with the support tube at both ends; there is a gap between the support tube and the microporous tube, a plurality of support tube through holes are provided through the side wall of the support tube, the left end outlet of the support tube is sealed with the microporous tube, and the support tube through hole, the gap and the right end outlet of the support tube are connected;

[0011] The interface has a through mounting hole, and the two ends of the elastic tube, the support tube and the microporous tube are respectively mounted in the mounting hole and the clamp ring, the right ends of the elastic tube, the support tube and the microporous tube are flush, and the right end of the elastic tube is interference fit with the clamp ring, and the left end of the microporous tube extends out of the left end of the support tube and is interference fit with the mounting hole;

[0012] The clamp ring is provided with a clamp ring injection port at the position where it is connected to the microporous tube, the through hole, the clamp ring injection port and the slit are connected, and the inner cavity of the elastic tube, the support tube through hole, the gap, the clamp ring injection port and the slit are connected.

[0013] Optionally, the microfluidic component comprises a support tube having a through hole in the length direction, an elastic tube sleeved outside the support tube and sealed with the support tube at both ends, a pair of sealing gaskets located on the left side of the support tube, and a microporous sheet located between the pair of sealing gaskets, and a plurality of support tube through holes are provided through the side wall of the support tube;

[0014] The interface has a through mounting hole, the sealing gasket, the microporous sheet, the left end of the support tube and the left end of the elastic tube are installed in the mounting hole, and the elastic tube is interference fit with the mounting hole, the right end of the support tube and the right end of the elastic tube are installed in the clamping ring, and the elastic tube is interference fit with the clamping ring, and the clamping ring is provided with a clamping ring injection port at the position where the clamping ring is connected to the elastic tube;

[0015] The mounting hole, the micropores of the microporous sheet, the through hole, the clamp ring injection port and the slit are connected, and the inner cavity of the elastic tube, the support tube through hole, the through hole, the clamp ring injection port and the slit are connected.

[0016] Optionally, the microfluidic structure includes a microporous tube with a through hole in the length direction, an inlet connection seat and an outlet connection seat respectively installed at both ends of the microporous tube, and an elastic tube connected to the inlet connection seat and the outlet connection seat at both ends, and an inlet clamp ring and an outlet clamp ring respectively installed on the elastic tube, the outlet connection seat has a through mounting hole, the microporous tube is sealed and connected to the outlet connection seat mounting hole, the inlet connection seat and the microporous tube are in clearance fit, the elastic tube has flange structures at both ends, the flange of the elastic tube at one end of the inlet connection seat is squeezed and sealed and fixed by the inlet clamp ring, and the flange of the elastic tube at one end of the outlet connection seat is squeezed and sealed and fixed with the outlet clamp ring. In addition, the inner wall of the outlet shell is provided with ribs, which can play a role in connecting the front and rear parts of the first inner cavity after the elastic tube expands and adheres to the wall, and the inlet connection seat and the inlet clamp ring are provided with exhaust holes, which can connect the first inner cavity and the second inner cavity, as well as the inlet shell through hole.

[0017] Optionally, a microfilament is provided in the through hole of the microporous tube, and the microfilament forms a tiny through gap with the wall of the microporous tube.

[0018] In order to solve the above-mentioned technical problems, the technical solution of the present invention further provides an infusion connector, which includes an infusion connector body and an infusion pump body, and the infusion pump is any of the above-mentioned infusion pumps with continuous positive pressure output function.

[0019] Optionally, the infusion connector body includes 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 open and forms a female Luer interface, and the side wall of the infusion connector body shell is formed with a pipe through hole; the piston structure includes a piston rod arranged in the infusion connector body shell near the female Luer interface, a sealing ring is installed between the piston rod and the infusion connector body shell, a spring is installed at the bottom of the piston rod, and the two ends of the spring respectively abut against the bottom of the piston rod and a limit pad installed on the inner bottom of the infusion connector body shell.

[0020] In order to solve the above technical problems, the technical solution of the present invention also provides a continuous infusion indwelling needle, which includes a needle tube assembly, a hose, a stop clamp and an infusion connector connected in sequence, and the infusion connector is the above-mentioned infusion connector.

[0021] There is also a continuous infusion clampless indwelling needle, which includes a needle tube assembly, a hose and an infusion connector connected in sequence, and the infusion connector is the infusion connector mentioned above.

[0022] The beneficial effects of the technical solution of the present invention are:

[0023] The infusion pump of the present invention realizes microflow that can continuously generate positive pressure for more than 24 hours by arranging a microfluidic component inside, which can fully meet the needs of most patients for infusion every other day, so that during the interval between infusions, there is always physiological saline or other liquid medicine in the indwelling catheter to flush the catheter to prevent the formation of blood clots in the blood vessels, and there is no need for medical staff to flush and seal the tube regularly, which effectively solves the problem of blockage in the indwelling catheter due to blood reflux and coagulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of an infusion pump in Embodiment 1 of the present invention;

[0025] Figure 2 is a cross-sectional view of an infusion pump in Embodiment 1 of the present invention;

[0026] Figure 3 is a cross-sectional view of an infusion pump in Embodiment 2 of the present invention;

[0027] Figure 4 is a cross-sectional view of an infusion pump in Embodiment 3 of the present invention;

[0028] Figure 5 is a cross-sectional view of an infusion pump in Embodiment 4 of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the infusion connector in Embodiment 5 of the present invention;

[0030] Figure 7 for Figure 6 A cross-sectional view of

[0031] Figure 8 This is a schematic diagram of the installation of the infusion connector and the indwelling needle in the fifth embodiment of the present invention;

[0032] Fig. 9 This is a schematic diagram of the structure of the infusion connector in Embodiment 6 of the present invention;

[0033] Fig.10 for Fig. 9 A cross-sectional view of

[0034] Fig.11 It is a general installation diagram of the infusion pump and the indwelling needle in the first, second, third and fourth embodiments of the present invention;

[0035] Fig.12 This is a diagram of a use state of the infusion connector in Embodiment 6 of the present invention;

[0036] Fig.13 This is another usage state diagram of the infusion connector in the sixth embodiment of the present invention;

[0037] Fig.14 This is a schematic diagram of the installation of the infusion connector and the indwelling needle in the seventh embodiment of the present invention;

[0038] Fig.15 for Fig.14 A cross-sectional view of

[0039] Fig.16 This is a schematic diagram of the installation of the infusion connector and the indwelling needle in the eighth embodiment of the present invention;

[0040] Fig.17 for Fig.16 A cross-sectional view of

[0041] Fig.18 is a cross-sectional view of an infusion connector in Embodiment 8 of the present invention;

[0042] Fig.19 This is a schematic diagram of the installation of the infusion connector and the indwelling needle in the ninth embodiment of the present invention;

[0043] Fig. 20 for Fig.19 A cross-sectional view of

[0044] Fig.21 is a cross-sectional view of an infusion connector in Embodiment 9 of the present invention;

[0045] Fig. 22 is a three-dimensional diagram of an infusion connector in Embodiment 9 of the present invention;

[0046] Fig.23 for Fig. 22 Enlarged view of point A in the middle. DETAILED DESCRIPTION

[0047] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0052] Embodiment 1

[0053] See also Figure 1 , Figure 2 and Fig.11 As shown, an infusion pump 100 with a continuous positive pressure output function according to an embodiment is shown, wherein the infusion pump body includes an infusion pump body in which a microfluidic component capable of generating a continuous positive pressure microflow is installed, and the microfluidic component converts the liquid medicine injected from the inlet of the infusion pump body into a slow continuous positive pressure microflow and outputs it to the outlet of the infusion pump body.

[0054] like Figure 2As shown, in this embodiment, the infusion pump body has a structure with a hollow inner cavity and two ends connected. The infusion pump body includes an outlet shell 2 provided with an interface 205 (in this embodiment, the interface 205 is preferably a male Luer interface) and an inlet shell 1 fixedly connected to the outlet shell 2; a clamp ring 6 is installed between the outlet shell 2 and the inlet shell 1, and the clamp ring 6 divides the hollow inner cavity into a first inner cavity 200 and a second inner cavity 300, and a medicated rubber plug 7 with a self-cut slit 701 is installed between the clamp ring 6 and the inlet shell 1; an outlet shell through hole 201 is provided at the connection between the interface 205 and the outlet shell 2, a clamp ring through hole 601 is provided at the clamp ring 6, and an inlet shell through hole 101 is provided at the inlet shell 1, and the outlet shell through hole 201, the first inner cavity 200, the clamp ring through hole 601, the second inner cavity 300 and the inlet shell through hole 101 are connected.

[0055] In this embodiment, the microfluidic component includes a microporous tube 5 having a through hole 501 in the length direction, a support tube 4 that is sleeved on the outside of the microporous tube 5 with a gap fit, and an elastic tube 3 (filled state) that is sleeved on the outside of the support tube 4 and sealed with the support tube 4 at both ends; there is a gap 451 between the support tube 4 and the microporous tube 5, and a plurality of support tube through holes 401 are penetrated through the side wall of the support tube 4, the left end outlet of the support tube 4 is sealed with the microporous tube 5, and the support tube through hole 401, the gap 451 and the right end outlet of the support tube 4 are connected.

[0056] The interface 205 has a through mounting hole 2051, and both ends of the elastic tube 3 (filled state), the support tube 4 and the microporous tube 5 are respectively installed in the mounting hole 2051 and the clamping ring 6, the right ends of the elastic tube 3 (filled state), the support tube 4 and the microporous tube 5 are flush, and the right end of the elastic tube 3 (filled state) is interference fit with the clamping ring 6, and the left end of the microporous tube 5 extends out of the left end of the support tube 4 and is interference fit with the mounting hole 2051.

[0057] The clamp ring 6 is provided with a clamp ring injection port 602 at the position where it is connected to the microporous tube 5, the through hole 501, the clamp ring injection port 602 and the slit 701 are connected, and the inner cavity of the elastic tube 3 (in a filled state), the support tube through hole 401, the gap 451, the clamp ring injection port 602 and the slit 701 are connected.

[0058] When the syringe is inserted from the inlet housing 1 into the drug-adding rubber plug 7 to squeeze it, the slit 701 of the drug-adding rubber plug 7 is opened, and the drug solution flows into the inner cavity of the elastic tube 3 (filled state) from the clamp ring injection port 602-gap 451-support tube through hole 401. When the syringe is pulled out of the drug-adding rubber plug 7, the slit 701 is restored and sealed. At this time, the inner cavity of the elastic tube 3 (filled state) expands in volume after the drug solution is injected, and an inward contraction force is generated. The contraction force causes the drug solution in the inner cavity of the elastic tube 3 (filled state) to pass through the support tube through hole 401-gap 451-clamp ring injection port 602-through hole 501 and flow out from the left outlet end of the microporous tube 5, thereby realizing the slow and continuous outflow of the drug solution.

[0059] like Fig.11 As shown, this embodiment discloses an indwelling needle, comprising a needle tube assembly 17, a hose 15, a flow stop clamp 16 installed on the hose, an infusion connector 20 and an infusion pump 100 connected in sequence, wherein the infusion pump 100 is the above-mentioned infusion pump with continuous positive pressure output function.

[0060] Embodiment 2

[0061] See also Figure 1 , Figure 3 and Fig.11 As shown, an infusion pump with a continuous positive pressure output function according to an embodiment is shown, wherein the structure of the microfluidic component in the infusion pump 100 in the second embodiment is substantially the same as that in the first embodiment, the only difference being that a microfilament 14 is disposed in the through hole 501 of the microporous tube 5 in the second embodiment, and the microfilament 14 forms a small through gap with the through hole 501. The working principle in the second embodiment is the same as that in the first embodiment, and will not be described in detail here.

[0062] In this embodiment, a microfilament 14 is inserted into the through hole 501 of the microporous tube 5 in an ordinary mechanical infusion pump. The flow channel cross-sectional area of ​​the through hole 501 is further reduced by the microfilament 14, thereby achieving the control of continuous positive pressure microflow with a smaller flow rate. This is a new type of micro-flow infusion pump.

[0063] like Fig.11 As shown, this embodiment discloses an indwelling needle, comprising a needle tube assembly 17, a hose 15, a flow stop clamp 16 installed on the hose, an infusion connector 20 and an infusion pump 100 connected in sequence, wherein the infusion pump 100 is the above-mentioned infusion pump with continuous positive pressure output function.

[0064] Embodiment 3

[0065] See also Figure 1 , Figure 4 and Fig.11As shown, an infusion pump with a continuous positive pressure output function according to an embodiment is shown, wherein the structure of the microfluidic component in the infusion pump 100 of the third embodiment is different from those of the first and second embodiments, and the structure of the infusion pump 100 is specifically described as follows.

[0066] In this embodiment, the microfluidic component includes a support tube 4 having a through hole 402 in the length direction, an elastic tube 3 (filled state) which is sleeved outside the support tube 4 and sealed with the support tube 4 at both ends, a pair of sealing gaskets 18 located on the left side of the support tube 4, and a microporous sheet 19 with through micropores 191 located between the pair of sealing gaskets 18. The side wall of the support tube 4 is penetrated by a plurality of support tube through holes 401.

[0067] The interface 205 has a through mounting hole 2051, the sealing gasket 18, the microporous sheet 19, the left end of the support tube 4 and the left end of the elastic tube 3 (filled state) are installed in the mounting hole 2051, and the elastic tube 3 (filled state) and the mounting hole 2051 have an interference fit, the right end of the support tube 4 and the right end of the elastic tube 3 (filled state) are installed in the clamping ring 6, and the elastic tube 3 (filled state) and the clamping ring 6 have an interference fit, and the clamping ring 6 is provided with a clamping ring injection port 602 at the position where it is connected to the elastic tube 3 (filled state).

[0068] The mounting hole 2051 , the micropores 191 of the microporous sheet 19 , the through hole 402 , the collar injection port 602 and the slit 701 are connected. The inner cavity of the elastic tube 3 (in a filled state), the support tube through hole 401 , the through hole 402 , the collar injection port 602 and the slit 701 are connected.

[0069] When the syringe is inserted from the inlet housing 1 into the medicated rubber plug 7 to squeeze it, the slit 701 of the medicated rubber plug 7 is opened, and the drug solution flows into the inner cavity of the elastic tube 3 (filled state) from the collar injection port 602-through hole 402-support tube through hole 401. When the syringe is pulled out of the medicated rubber plug 7, the slit 701 is restored and sealed. At this time, the inner cavity of the elastic tube 3 (filled state) expands in volume after the injection of the drug solution, and an inward contraction force is generated. The contraction force causes the drug solution in the inner cavity of the elastic tube 3 (filled state) to pass through the support tube through hole 401-through hole 402-micropore 191 and flow out from the left outlet end of the microporous sheet 19, thereby realizing the slow and continuous outflow of the drug solution.

[0070] like Fig.11 As shown, this embodiment discloses an indwelling needle, comprising a needle tube assembly 17, a hose 15, a flow stop clamp 16 installed on the hose, an infusion connector 20 and an infusion pump 100 connected in sequence, wherein the infusion pump 100 is the above-mentioned infusion pump with continuous positive pressure output function.

[0071] Embodiment 4

[0072] See also Figure 1 , Figure 5 and Fig.11 As shown, an infusion pump with a continuous positive pressure output function according to an embodiment is shown, wherein the microfluidic installation structure of the infusion pump 100 in the fourth embodiment is different from those in the first, second and third embodiments, and the structure of the infusion pump 100 is specifically described as follows.

[0073] The microfluidic structure includes a microporous tube 5 having a through hole 501 in the length direction, a microfilament 14 placed in the microporous tube, an inlet connection seat 23 and a male Luer interface 205 respectively installed at both ends of the microporous tube 5, and an elastic tube 3 (filled state) whose two ends are respectively connected to the inlet connection seat 23 and the male Luer interface 205, an inlet clamp ring 22 and an outlet clamp ring 21 respectively installed on the elastic tube 3 (filled state), the male Luer interface 205 has a through mounting hole, the microporous tube 5 is sealed and connected to the mounting hole of the male Luer interface 205, the inlet connection seat 23 and the microporous tube 5 are gap-matched, the elastic tube 3 (filled state) has flange 301 structures at both ends, the flange 301 of the elastic tube 3 (filled state) at one end of the inlet connection seat 23 is squeezed and sealed by the inlet clamp ring 22, and the flange 301 of the elastic tube 3 (filled state) at one end of the male Luer interface 205 is The outlet collar 21 is fixed by extrusion sealing.

[0074] The inner wall of the outlet shell 2 is provided with a rib 210, which can connect the front and rear parts of the first inner cavity 200 after the elastic tube 3 expands and adheres to the wall. The inlet connecting seat 23 is provided with a through hole 230, and the inlet clamping ring is provided with a through hole 220. The connecting seat through hole 230 can connect the first inner cavity 200 and the second inner cavity 300 through the inlet clamping ring through hole 220, and connect to the inlet shell through hole 101.

[0075] When the syringe is inserted from the inlet housing 1 into the drug-adding plug 7 to squeeze it so that the slit 701 of the drug-adding plug 7 is opened, the drug solution enters the gap between the inlet connecting seat and the microporous tube from the inlet connecting seat injection port 231, and then directly flows into the inner cavity of the elastic tube 3 (filled state). When the syringe is pulled out of the drug-adding plug 7, the slit 701 is restored and sealed. At this time, the inner cavity of the elastic tube 3 (filled state) expands in volume after the drug solution is injected, and an inward contraction force is generated. The contraction force causes the drug solution in the inner cavity of the elastic tube 3 (filled state) to pass through the gap between the inlet connecting seat and the microporous tube - the inlet connecting seat injection port 231 - the gap between the through hole 501 and the microfilament 14 and flow out from the left outlet end of the microporous tube 5, thereby realizing the slow and continuous outflow of the drug solution.

[0076] like Fig.11As shown, this embodiment discloses an indwelling needle, comprising a needle tube assembly 17, a hose 15, a flow stop clamp 16 installed on the hose, an infusion connector 20 and an infusion pump 100 connected in sequence, wherein the infusion pump 100 is the above-mentioned infusion pump with continuous positive pressure output function.

[0077] It is worth noting that the details of materials, dimensions, functions, etc. in embodiments 1, 2, 3, and 4 are as follows.

[0078] The elastic tube 3 (filled state) is made of elastic materials such as silicone, rubber or latex, the support tube 4 is made of polymer or metal materials such as PC, PVC or stainless steel, the microporous tube 5 is made of polymer or metal materials such as PVC, PC, glass or stainless steel, the microfilament 14 is made of polymer or metal materials such as PC, PVC, nylon, PTFE, PEEK, nickel-titanium alloy or stainless steel, and the microporous sheet 19 is made of polymer or metal materials such as PC, PVC, nylon, PTFE, PEEK, glass, nickel-titanium alloy or stainless steel.

[0079] The cross-sectional shape of the microporous tube hole can be circular, elliptical, square, or polygonal, and the cross-sectional shape of the microfilament can be circular, elliptical, square, or polygonal.

[0080] The circular microporous tube 5 has a pore diameter of 0.01-1mm and a length of 1-50mm. The circular microfilament 14 has a diameter of 0.01-1mm and a length of 1-50mm. The micropores 191 of the microporous sheet 19 have a pore diameter of 0.001-0.01mm and a thickness of the microporous sheet 19 of 0.01-1mm.

[0081] The inner cavity of the elastic tube 3 (in the filled state) can store 0.05-5 ml of liquid medicine.

[0082] The positive pressure duration of the infusion pump 100 is 8-168 hours, preferably 24-72 hours.

[0083] It is worth noting that in Examples 1 to 4, Figures 2 to 4 In the embodiment, a liquid filter membrane 24 is installed at the inlet end of the collar 6 to filter impurities.

[0084] Embodiment 5

[0085] See also Figure 6 , Figure 7 and Figure 8 As shown, an infusion connector of an infusion pump with a continuous positive pressure output function is shown, including an infusion pump 100 and an infusion connector body fixedly connected thereto, wherein the upper end of the infusion connector body is designed as a female Luer interface 202, and the lower end is designed as a male Luer interface 205. This infusion connector can be connected to a general ordinary infusion pipeline (such as Figure 8 ), and can realize normal infusion of the pipeline and continuous circulation of the pipeline during the intermittent period, such as connecting to the interface of the intravenous indwelling needle, central venous catheter and peripherally inserted central venous catheter. It is worth noting that the main structure of the infusion pump 100 in this embodiment remains unchanged and the specific working principle is the same as that of the first, second, third and fourth embodiments, which will not be repeated here.

[0086] Embodiment 6

[0087] See also Fig. 9 , Fig.10 , Fig.12 and Fig.13 As shown, an infusion connector of an infusion pump with a continuous positive pressure output function is shown, wherein the infusion pump 100 of this embodiment sets an infusion connector body on the outlet housing 2, and the infusion connector body is a T-shaped structure, specifically, the upper end of the infusion connector body housing 8 is a female Luer interface 202, a male Luer interface 205 is set on one side, and the other side is connected to the outlet housing 2, and a piston rod 9 is set inside the infusion connector body housing 8. The piston rod 9 is thin at the top and thick at the bottom, and a sealing ring 10 is set at the upper end and the lower end respectively. A spring 11 is set inside the piston rod 9, and the other end of the spring 11 is against a limit pad 12, and the limit pad 12 is fixedly connected to the lower end of the infusion connector body housing 8. When the syringe is docked with the female Luer interface 202, the injection head of the syringe pushes the piston rod 9 downward and compresses the spring 11 at the same time, so that the pipeline can be opened to inject the liquid medicine. When the syringe is separated from the female Luer interface 202, the piston rod 9 rebounds through the spring 11 to seal the female Luer interface 202 and generate positive pressure at the same time. When the drug solution is injected through the infusion pump 100 and flows into the inner cavity 81 in the infusion connector main body shell 8, it flows into the indwelling needle hose connected thereto.

[0088] Connecting this infusion connector to the infusion line can achieve normal infusion of the line, positive pressure separation after flushing, and continuous flow of the line during the intermittent period, such as connecting to intravenous indwelling needles, central venous catheters (as shown in Figure 12), and peripherally inserted central venous catheters (as shown in Figure 13). Fig.13 The main structure of the infusion pump 100 remains unchanged and the specific working principle is the same as that of the first, second, third and fourth embodiments, which will not be described in detail here.

[0089] Embodiment 7

[0090] See also Fig.14 and Fig.15 , an infusion connector of an infusion pump with a continuous positive pressure output function is shown, wherein the infusion pump 100 is integrally arranged with the infusion connector 20, and the infusion connector 20 is designed to have a structure with a female Luer interface 202 at one end and a connecting pipe through hole 204 at the other end, and the connecting pipe through hole 204 can be bonded to one end of a hose 15, and the other end of the hose 15 can be bonded to the needle tube assembly 17 of the indwelling needle (such as Fig.14As shown in FIG. 1 , a stopper clip 16 is provided in the middle of the hose 15, which is a new type of continuous positive pressure indwelling needle. The main structure of the infusion pump 100 remains unchanged and the specific working principle is the same as that of the first, second and third embodiments, which will not be described in detail here.

[0091] The above embodiments 1 to 7 are all connected to an indwelling needle, and the indwelling needle has a stopper clip 16 on the hose 15, and the indwelling needle is mainly a needle assembly 17, a hose 15, a stopper clip 16, an infusion connector 20 and (an infusion pump 100 / an infusion connector formed integrally with the infusion pump 100 / an infusion connector formed by combining the infusion pump 100 with the infusion connector main body shell 8). The following embodiments 8 and 9 are both in which an infusion connector with an infusion pump 100 structure is combined with an indwelling needle, and the stopper clip 16 and the infusion connector 20 are eliminated, but the main structure and working principle of the infusion pump 100 are the same as those of embodiments 1 to 7, so the working principle will not be repeated.

[0092] Embodiment 8

[0093] See also Fig.16 , Fig.17 and Fig.18 As shown, an infusion connector with a continuous positive pressure output function is shown, wherein the infusion pump 100 of this embodiment is connected to the infusion connector body, the infusion infusion connector body includes an infusion connector body shell 8 and a piston structure arranged in the infusion connector body shell 8, the upper end of the infusion connector body shell 8 is open and forms a female Luer interface 202, and the side wall of the infusion connector body shell 8 is formed with a pipe through hole 802; the piston structure includes a piston rod arranged in the infusion connector body shell 8 near the female Luer interface 202, 9 a sealing ring 10 is installed between the piston rod 9 and the infusion connector body shell 8, a spring 11 is installed at the bottom of the piston rod 9, and the two ends of the spring 11 are respectively against the bottom of the piston rod 9 and the limit pad 12 installed on the inner bottom of the infusion connector body shell 8, the pipe through hole 802 is bonded to one end of the hose 15, and the other end of the hose 15 is bonded to the needle tube assembly 17 of the indwelling needle, and no stop clamp is required in the middle. This is another new type of continuous infusion clampless indwelling needle. The main structure of the infusion pump 100 remains unchanged and the specific working principle is the same as that of the first, second, third and fourth embodiments, which will not be described in detail here.

[0094] Embodiment 9

[0095] See also Fig.19 , Fig. 20 , Fig.21 , Fig. 22 and Fig.23As shown, an infusion connector with a continuous positive pressure output function according to an embodiment is shown, wherein the infusion pump 100 of this embodiment is designed to have two infusion connection interface structures, which are symmetrical up and down. The infusion interface of this embodiment is a symmetrical structure, so the structural description of one end is sufficient, which does not hinder the understanding of the specific symmetrical structure, see Figures 19 to 23 As shown, specifically, a piston chamber 208 is designed in the middle position, a spring 11 and a piston 9 are placed in the piston chamber, and a sealing ring 10 is placed at the upper and lower ends of the piston 9. The piston chamber 208 can be connected to the exhaust hole 206 of the outlet housing 2 to achieve exhaust and suction when the piston 9 moves. Then a flow channel chamber 209 is designed on the outer ring of the piston chamber 208. The flow channel chamber 209 connected up and down can be connected through the connecting hole 207, and one side is connected to the microporous tube 5, and the other side is connected to the hose 15. A female Luer connector 202 is set at the upper and lower ends of the outlet housing 2. Its needleless connection principle and positive pressure principle are the same as those of the fifth and seventh embodiments. The other end of the hose 15 is bonded to the needle tube assembly 17 of the indwelling needle. No stop clamp is required in the middle. The infusion pump 100 with this symmetrical structure can connect two infusion lines. This is another new type of continuous infusion clampless indwelling needle. The main structure of the infusion pump 100 remains unchanged and the specific working principle is the same as that of the first, second and third embodiments, which will not be repeated here.

[0096] In summary, the infusion pump of the present invention realizes microflow that can continuously generate positive pressure for more than 24 hours by arranging a microfluidic component inside, which can fully meet the needs of most patients for infusion every other day, so that during the interval between infusions, there is always physiological saline or other liquid medicine in the indwelling catheter to flush the catheter to prevent the formation of blood clots in the blood vessels, and there is no need for medical staff to flush and seal the tube regularly, which effectively solves the problem of catheter blockage caused by blood reflux and coagulation in the indwelling needle or other infusion tube.

[0097] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An infusion pump with continuous positive pressure output function, characterized in that: The infusion pump comprises an infusion pump body, in which a microfluidic component capable of generating a continuous positive pressure microfluidic is installed, and the microfluidic component converts the liquid medicine injected from the inlet of the infusion pump body into a slow continuous positive pressure microfluidic and outputs it to the outlet of the infusion pump body; The infusion pump body has a hollow inner cavity and is through-connected at both ends. The infusion pump body includes an outlet shell with an interface therein and an inlet shell fixedly connected to the outlet shell; a clamp ring is installed between the outlet shell and the inlet shell, and the clamp ring divides the hollow inner cavity into a first inner cavity and a second inner cavity, and a drug-adding rubber plug with a self-cut slit is installed between the clamp ring and the inlet shell; an outlet shell through hole is through-connected at the connection between the interface and the outlet shell, the clamp ring is through-connected with a clamp ring through hole, and the inlet shell is through-connected with an inlet shell through hole, and the outlet shell through hole, the first inner cavity, the clamp ring through hole, the second inner cavity and the inlet shell through hole are connected; The microfluidic component comprises a microporous tube having a through hole in the length direction, a support tube sleeved outside the microporous tube with a clearance fit, and an elastic tube sleeved outside the support tube and sealed with the support tube at both ends; there is a gap between the support tube and the microporous tube, a plurality of support tube through holes are provided through the side wall of the support tube, the left end outlet of the support tube is sealed with the microporous tube, and the support tube through hole, the gap and the right end outlet of the support tube are connected; The interface has a through mounting hole, and the two ends of the elastic tube, the support tube and the microporous tube are respectively mounted in the mounting hole and the clamp ring, the right ends of the elastic tube, the support tube and the microporous tube are flush, and the right end of the elastic tube is interference fit with the clamp ring, and the left end of the microporous tube extends out of the left end of the support tube and is interference fit with the mounting hole; The clamp ring is provided with a clamp ring injection port at the position where it is connected to the microporous tube, the through hole, the clamp ring injection port and the slit are connected, and the inner cavity of the elastic tube, the support tube through hole, the gap, the clamp ring injection port and the slit are connected.

2. An infusion pump with continuous positive pressure output function, characterized in that: The infusion pump comprises an infusion pump body, in which a microfluidic component capable of generating a continuous positive pressure microfluidic is installed, and the microfluidic component converts the liquid medicine injected from the inlet of the infusion pump body into a slow continuous positive pressure microfluidic and outputs it to the outlet of the infusion pump body; The infusion pump body has a hollow inner cavity and is connected at both ends. The infusion pump body includes an outlet shell with an interface and an inlet shell fixedly connected to the outlet shell; a clamp ring is installed between the outlet shell and the inlet shell, and the clamp ring divides the hollow inner cavity into a first inner cavity and a second inner cavity, and a drug-adding rubber plug with a self-cut slit is installed between the clamp ring and the inlet shell; an outlet shell through hole is provided through the connection between the interface and the outlet shell, the clamp ring is provided with a clamp ring through hole, and the inlet shell is provided with an inlet shell through hole, and the outlet shell through hole, the first inner cavity, the clamp ring through hole, the second inner cavity and the inlet shell through hole are connected; the microfluidic component includes a support tube with a through hole in the length direction, an elastic tube sleeved outside the support tube and sealed with the support tube at both ends, a pair of sealing pads located on the left side of the support tube, and a microporous sheet located between the pair of sealing pads, and a plurality of support tube through holes are provided through the side wall of the support tube; The interface has a through mounting hole, the sealing gasket, the microporous sheet, the left end of the support tube and the left end of the elastic tube are installed in the mounting hole, and the elastic tube is interference fit with the mounting hole, the right end of the support tube and the right end of the elastic tube are installed in the clamping ring, and the elastic tube is interference fit with the clamping ring, and the clamping ring is provided with a clamping ring injection port at the position where the clamping ring is connected to the elastic tube; The mounting hole, the micropores of the microporous sheet, the through hole, the clamp ring injection port and the slit are connected, and the inner cavity of the elastic tube, the support tube through hole, the through hole, the clamp ring injection port and the slit are connected.

3. An infusion pump with continuous positive pressure output function, characterized in that: The infusion pump comprises an infusion pump body, in which a microfluidic component capable of generating a continuous positive pressure microfluidic is installed, and the microfluidic component converts the liquid medicine injected from the inlet of the infusion pump body into a slow continuous positive pressure microfluidic and outputs it to the outlet of the infusion pump body; The infusion pump body has a hollow inner cavity and is through-connected at both ends. The infusion pump body includes an outlet shell with an interface therein and an inlet shell fixedly connected to the outlet shell; a clamp ring is installed between the outlet shell and the inlet shell, and the clamp ring divides the hollow inner cavity into a first inner cavity and a second inner cavity, and a medicated rubber plug with a self-cut slit is installed between the clamp ring and the inlet shell; an outlet shell through hole is provided through the connection between the interface and the outlet shell, the clamp ring is provided with a clamp ring through hole, and the inlet shell is provided with an inlet shell through hole, and the outlet shell through hole, the first inner cavity, the clamp ring through hole, the second inner cavity and the inlet shell through hole are connected, so that The microfluidic component comprises a microporous tube having a through hole in the length direction, an inlet connection seat and an outlet connection seat respectively installed at both ends of the microporous tube, an elastic tube connected to the inlet connection seat and the outlet connection seat at both ends respectively, and an inlet clamp ring and an outlet clamp ring respectively installed on the elastic tube, the outlet connection seat having a through mounting hole, the microporous tube and the outlet connection seat mounting hole are sealed and bonded, the inlet connection seat and the microporous tube are gap-matched, the elastic tube has flange structures at both ends, the flange of the elastic tube at one end of the inlet connection seat is fixed by extrusion sealing by the inlet clamp ring, and the flange of the elastic tube at one end of the outlet connection seat is fixed by extrusion sealing with the outlet clamp ring; The inner wall of the outlet shell is provided with a plurality of ribs, which can connect the front and rear parts of the first inner cavity after the elastic tube expands and adheres to the wall. The inlet connecting seat and the inlet clamp ring are provided with exhaust holes, which can connect the first inner cavity and the second inner cavity, as well as the through hole of the inlet shell.

4. The infusion pump with continuous positive pressure output function according to claim 3, characterized in that: A microfilament is arranged in the through hole of the microporous tube, and a tiny through gap is formed between the microfilament and the wall of the microporous tube.

5. An infusion connector, characterized in that: It comprises an infusion connector body and an infusion pump body, and the infusion pump is an infusion pump with a continuous positive pressure output function as described in any one of claims 1-4.

6. The infusion connector according to claim 5, characterized in that: 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 open and forms a female Luer interface, and the side wall of the infusion connector body shell is formed with a pipe through hole; the piston structure comprises a piston rod arranged in the infusion connector body shell near the female Luer interface, a sealing ring is installed between the piston rod and the infusion connector body shell, a spring is installed at the bottom of the piston rod, and the two ends of the spring respectively abut against the bottom of the piston rod and a limit pad installed on the inner bottom of the infusion connector body shell.

7. A continuous infusion indwelling needle, characterized in that: It comprises a needle tube assembly, a stop clamp, a hose and an infusion connector which are connected in sequence, and the infusion connector is the infusion connector according to claim 5 or 6.

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