Anti-reflux catheter and Anti-reflux safety catheter

Abstract

The present invention relates to an anti-reflux catheter comprising: a cannula provided with a needle; a catheter hub having an internal space with a first region in which a flow path is formed and a second region forming a fastening space, and a small aperture communicating with the internal space is formed at the front end thereof and the rear end thereof is open; a gasket made of an elastic material, provided in the internal space of the catheter hub, having a slit formed therein through which the needle passes and which closes upon withdrawal of the needle; and a holder provided in the internal space of the catheter hub, the front end of the holder attaching to the inner side of the gasket so as to press on same; wherein the gasket is moved from a first position in the internal space to a second position in the forward direction by the pressing of the holder, the first position of the gasket being located in the second region and the second position of the gasket being located in the first region.

Description

Anti-reflux catheter and anti-reflux safety catheter

[0001] The present invention relates to a backflow prevention catheter that prevents blood backflow after catheter withdrawal and allows for the injection of a drug solution, and a backflow prevention safety catheter that prevents the reuse of the needle and allows for safe disposal.

[0002] Generally, patients who have difficulty consuming food, surgical patients, and patients with impaired bodily functions requiring nutritional supplementation must receive fluids via an IV set. In such cases, the fluids are often administered directly into the patient's blood vessels. To this end, medical practitioners typically secure a catheter to the patient's blood vessel and then connect the supply tube of the IV set to the catheter to administer the fluids.

[0003] Since the catheter remains connected to the patient's blood vessel even when the supply tube of the IV set is disconnected, such as when fluid replacement is required, there is a risk of blood backflow from the catheter hub. Therefore, the catheter requires a configuration to prevent blood backflow.

[0004] FIG. 1 is a backflow prevention catheter disclosed in Korean Registered Patent No. 2005309 (hereinafter referred to as the prior patent) as the applicant's prior art. Referring to FIG. 1, the catheter hub (10) of the prior patent may include a body (11), a tube (13), and a blood blocking part (14). The catheter hub (10) introduces the tube (13) into the patient's blood vessel through a cannula puncture procedure. Subsequently, when a connecting tip (30) for injecting a drug solution is attached to the catheter hub (10), a continuous drug solution is supplied through the tube (13) inserted into the blood vessel while preventing backflow of blood. A one-time supply of a drug solution to the blood vessel is completed by a one-time puncture with a syringe. On the other hand, in cases where there is a need for continuous administration of drugs, such as blood transfusions or IV drips, a catheter hub (10) as in the present embodiment is used so that the connecting tip (30) of the drug solution is routed into the blood vessel. In this process, the catheter hub (10) involves the introduction of a cannula for initial vascular invasion and the removal of the cannula to attach the connecting tip (30) after the invasion is completed. At this time, if the cannula is removed, blood may flow back into the catheter hub (10) inserted into the blood vessel. The blood blocking part (14) of the prior patent includes a gasket (141) and a holder (143). In the prior patent, the holder (143) pushes the incision of the gasket (141) to open it, and then retracts to close the incision, thereby blocking the backflow of blood. However, in this case, precise design of the incision is required. In the prior patent, even if the incision is closed, there is a concern that a small amount of blood may flow back through the incision if the pressure of the backflowing blood is high.

[0005] Accordingly, the applicant has devised a backflow prevention catheter capable of more effectively blocking blood backflow while simplifying the design.

[0006] Meanwhile, in modern medicine, the reuse of invasive devices is treated as an absolute 'taboo.' In particular, catheter needles, which are directly linked to the risk of infection, must be used only once regardless of the invasive site. This is because needles are made to be extremely fine and become deformed after a single use, posing a risk of damaging tissues such as blood vessels more than necessary upon reuse; moreover, since they enter and exit the human body, there is a high possibility that they will act as a medium for infection.

[0007] Although the reuse of invasive disposable medical devices such as catheters is prohibited, non-medical professionals sometimes reuse needles by heating them with fire due to lax hygiene practices and cost considerations. Therefore, invasive medical devices like catheters need to be designed structurally to prevent reuse.

[0008] The applicant's prior registered patent, Korean Patent No. 10-1598469, relates to a catheter in which the hub and the moving bar are fixed or separated by teeth formed on a gear, a rack, and a hub, and after the needle retracts and the moving bar and hub are separated, the rack blocks the path of the needle toward the outside, thereby having an irreversible operation mechanism that makes the reuse of the needle impossible.

[0009] However, conventional safety catheters designed to prevent reuse required the pivot housing to be provided with a relatively large volume to accommodate rack and gear components in the pivot configuration. Additionally, the blocking means for preventing reuse consisted of two pieces—a rack and a gear—which required time and cost for assembly during manufacturing. Given that the manufacturing cost of a catheter is clearly directly linked to business performance, it would be undesirable to require multiple injection-molded parts and complex manufacturing processes to achieve a one-time use condition.

[0010] Accordingly, the applicant has devised a safety catheter for preventing reuse that is easy to assemble and has minimized parts, by simplifying the structure through a design modification of the above-mentioned Korean Registered Patent No. 10-1598469, and in particular, significantly reducing the volume of the pivot for preventing reuse.

[0011] The present invention aims to provide a backflow prevention catheter capable of preventing blood backflow. In addition, the present invention aims to provide a backflow prevention safety catheter to prevent reuse.

[0012] A backflow prevention catheter according to an embodiment of the present invention comprises: a cannula having a needle; a catheter hub having an internal space formed therein having a first region forming a fluid path and a second region forming a fastening space, wherein a small hole communicating with the internal space is formed at the front end and the rear end is open; a gasket made of an elastic material provided in the internal space of the catheter hub, having an opening formed therein that allows the needle to enter and exit and is restored upon the detachment of the needle; and a holder provided in the internal space of the catheter hub, wherein the front end is fastened to the inside of the gasket to press the gasket; wherein the gasket is characterized in that the region in which the holder is received moves from a first position in the internal space to a second position in the front direction due to the pressure of the holder, and the first position of the gasket is formed in the second region and the second position of the gasket is formed in the first region.

[0013] In one embodiment, the gasket may be in a position where the area in which the holder is received is provided in the internal space, such that the first position is in a first state in which the cannula is connected to the catheter hub, the area in which the holder is received is in a second state in which the cannula is detached from the catheter hub, and the area in which the holder is received is in a third state in which a connecting tip for injecting a drug solution is connected to the catheter hub.

[0014] In one embodiment, the gasket seals the first region when maintained in the first position in the first state and the second state, thereby preventing backflow of blood flowing into the catheter hub.

[0015] In one embodiment, the catheter hub has a line-shaped partition protruding longitudinally in the first region, and the partition is formed in multiple numbers along the inner circumferential surface of the catheter hub, and a flow path for injecting a drug solution can be formed between the multiple partitions.

[0016] In one embodiment, the partition wall may be an inclined surface in which the end of a protruding surface forming the boundary between the first region and the second region is cut in the shear direction.

[0017] In one embodiment, the catheter hub has a first inner diameter formed in the first region and a second inner diameter formed in the second region, and the inner diameter in the first region is reduced by the protruding length of the partition wall so that the first inner diameter is formed to be smaller than the second inner diameter.

[0018] In one embodiment, the gasket is pressed by the pressure of the holder so that the lower disk, which was received into the second inner diameter and sealed the first region, is fitted into the first inner diameter, and the outer surface can be fitted and fixed to the upper surface of the partition wall in the first region.

[0019] In one embodiment, the holder has a body having a through hole formed therein for the needle or liquid to enter and exit, and the body may include a front end that is fastened to the gasket and a rear end having a cut surface formed in one area of ​​the outer surface.

[0020] In one embodiment, when the holder is connected such that a connecting tip for injecting a drug solution comes into contact with the rear end, the drug solution flowing in from the connecting tip flows into the internal space through the cut surface of the rear end and can be discharged into the small hole of the catheter hub along the flow path of the first region.

[0021] In one embodiment, the gasket may include: an upper disk having an outer diameter smaller than the inner diameter of the first region and into which the tip of the holder is inserted; and a lower disk having an outer diameter larger than the outer diameter of the upper disk to seal the second region and being pressed into the first region by elasticity to be fitted and fixed.

[0022] The present invention maximizes elastic sealing efficiency by implementing a micro-incision in the gasket optimized to allow only the entry and exit of the needle. In the second state, when the needle is withdrawn, the gasket remains stably in the first position, perfectly sealing the internal space and effectively preventing blood backflow. In the third state, when the connecting tip is engaged, the gasket moves precisely to the second position, forming an independent flow path for drug injection along the inner outer surface of the first region of the catheter hub. Through these structural features, the present invention provides a backflow prevention catheter with excellent assembly process efficiency and cost competitiveness by maximizing blood backflow prevention performance while securing an independent flow path for drug injection.

[0023] In addition, the present invention relates to a backflow prevention safety catheter that prevents backflow and prevents reuse, wherein, during the process in which the cannula plug is separated from the catheter hub, a locking pivot engaged with the catheter hub rotates to block the interior of the block socket. In the present invention, a single configuration of the locking pivot is sufficient as a means to block the re-entry of the inner needle, thereby minimizing the number of parts and, in particular, making the volume of the block socket small.

[0024] Figure 1 is a conventional anti-backflow catheter.

[0025] FIG. 2 is a partial transparency of an anti-reflux catheter according to an embodiment of the present invention. FIG. 2(a) shows an anti-reflux catheter with a cannula connected, and FIG. 2(b) shows an anti-reflux catheter with a connecting tip connected for drug injection.

[0026] FIG. 3 is an exploded view of a backflow prevention catheter according to an embodiment of the present invention.

[0027] FIG. 4 is a perspective view of a gasket and a holder according to an embodiment of the present invention.

[0028] FIG. 5 is a cross-sectional view of a catheter hub according to an embodiment of the present invention.

[0029] Figure 6 is a diagram showing the usage state of a reflux prevention catheter according to an embodiment of the present invention.

[0030] FIG. 7 is a perspective view of the catheter hub in the P section disclosed in FIG. 6 (c).

[0031] FIG. 8 is a view showing the flow path through which a drug solution is injected in an anti-reflux catheter according to an embodiment of the present invention.

[0032] FIG. 9 shows the operation of a reflux prevention safety catheter according to another embodiment of the present invention. FIG. 9 (a) shows the reflux prevention safety catheter before puncturing a blood vessel, and FIG. 9 (b) shows the needle being withdrawn after puncturing a blood vessel of the reflux prevention safety catheter.

[0033] FIG. 10 is a cross-sectional view of a backflow prevention safety catheter according to the embodiment of FIG. 9.

[0034] FIG. 11 is an enlarged view of the part where the configuration for preventing backflow and the configuration for preventing reuse are located in FIG. 10.

[0035] Figure 12 (a) shows a catheter hub of a backflow prevention safety catheter according to the embodiment of Figure 9, and Figure 12 (b) shows a gasket of a backflow prevention safety catheter according to the embodiment of Figure 9.

[0036] FIG. 13 is an exploded perspective view of a configuration for preventing reuse of a backflow prevention safety catheter according to the embodiment of FIG. 9.

[0037] Figure 14 shows the locking pivot connected to the block socket in a configuration to prevent reuse of Figure 13.

[0038] The various embodiments described in this document are illustrative for the purpose of clearly explaining the technical concept of the invention and disclosure, and are not intended to limit them to specific embodiments. The technical concept of the invention and disclosure includes various modifications, equivalents, alternatives, and embodiments selectively combined from all or part of each embodiment described in this document. Furthermore, the scope of rights of the technical concept of the invention and disclosure is not limited to the embodiments presented below or the specific descriptions thereof.

[0039] Terms used in this document, including technical or scientific terms, may have the meaning generally understood by those skilled in the art to which the invention and disclosure pertain.

[0040] Expressions used in this document, such as "includes," "may include," "is equipped," "may be equipped," "has," and "may have," imply that functions, operations, or components exist as the subject feature and do not exclude the existence of other additional features. In other words, such expressions should be understood as open-ended terms implying the possibility of including other embodiments.

[0041] Singular expressions used in this document may include the meaning of the plural form unless the context otherwise indicates, and this applies likewise to singular expressions described in the claims.

[0042] Expressions used in this document such as “A, B, and C,” “A, B, or C,” “A, B, and / or C,” or “at least one of A, B, and C,” “at least one of A, B, or C,” “at least one of A, B, and / or C,” “at least one selected from A, B, and C,” “at least one selected from A, B, or C,” “at least one selected from A, B, and / or C,” etc., may mean each of the listed items or all possible combinations of the listed items. For example, “at least one selected from A and B” may refer to (1) A, (2) at least one of A, (3) B, (4) at least one of B, (5) at least one of A and at least one of B, (6) at least one of A and B, (7) at least one of B and A, and (8) all of A and B.

[0043] The expression "based on" as used in this document is used to describe one or more factors affecting an act or action of a decision or judgment described in the phrase or sentence containing such expression, and this expression does not exclude additional factors affecting said act or action of a decision or judgment.

[0044] As used in this document, the expression that a certain component (e.g., a first component) is "connected" or "connected" to another component (e.g., a second component) may mean not only that the said certain component is directly connected or connected to the said other component, but also that it is connected or connected through a new other component (e.g., a third component).

[0045] The expression "configured to" as used in this document may have meanings such as "set to," "capable of," "modified to," "made to," or "able to," depending on the context, and is distinguished from the meaning of "consist."

[0046] Various embodiments of the present disclosure will be described below with reference to the accompanying drawings. In the accompanying drawings and the description thereof, identical or substantially equivalent components may be given the same reference numerals. Furthermore, in the description of the various embodiments below, the description of identical or corresponding components may be omitted, but this does not mean that such components are not included in the embodiments.

[0047] FIG. 2 is a partial transparency of an anti-backflow catheter according to an embodiment of the present invention. FIG. 2 (a) shows an anti-backflow catheter (1) connected to a cannula, and FIG. 2 (b) shows an anti-backflow catheter (1') connected to a connecting tip for injecting medication.

[0048] The anti-backflow catheter (1) may include a catheter hub (10), a cannula (50), a needle (51), a tube (13), a gasket (141), a hub (143), and a connecting tip (30). The anti-backflow catheter (1) may be provided in a form in which the cannula (50) or the connecting tip (30) is inserted into the catheter hub (10).

[0049] The cannula (50) is a medical device equipped with a needle (51) and may be a venous cannula, an arterial cannula, or a central venous cannula. The cannula (50) is a device for inserting the needle (51) into a blood vessel for intravascular drug or fluid administration and may be detachably connected to a catheter hub (10). The connecting tip (30) may be a connecting component for injecting a drug such as fluid, antibiotic, analgesic, or anticoagulant.

[0050] In the anti-backflow catheter (1), the cannula (50) and the connecting tip (30) may be optional components, and commercially available cannula (50) or connecting tip (30) may be connected. Essential components for anti-backflow may include a catheter hub (10), a gasket (141), and a hub (143), and the gasket (141) and the hub (143) may be provided in a packaged form on the catheter hub (10).

[0051] FIG. 2(a) may illustrate the configuration of a reflux prevention catheter (1) to which a cannula (50) is connected. A needle (51) may be fixedly connected to the cannula (50), and the cannula (50) may be connected to a catheter hub (10). FIG. 3 is an exploded view of the configuration of a reflux prevention catheter (1) according to an embodiment of the present invention.

[0052] Referring to FIGS. 2 and 3, the needle (51) can pass through the small hole at the front end of the catheter hub (10) via the holder (143) and gasket (141) when the catheter hub (10) is connected. A flexible tube (13) that fits into the small hole may be provided at the front end of the catheter hub (10). The needle (51) is guided to the inner center of the catheter hub (10) and penetrates into the tube (13), and can be exposed outside the end of the tube (13). After the tube (13) is penetrated into the blood vessel along the guide of the needle (51), when the needle (51) is withdrawn from the tube (13), it can be positioned within the blood vessel to form a path for drug injection.

[0053] The state of FIG. 2 (a) can be seen as the appearance of a reflux prevention catheter (1) for vascular puncture. The reflux prevention catheter (1) is provided with an initial cannula (50) attached, and after vascular puncture, the cannula (50) is separated from the catheter hub (10). After the cannula (50) is separated from the catheter hub (10), a connecting tip (30) is attached to the catheter hub (10). FIG. 2 (b) illustrates the state of the reflux prevention catheter (1') with the connecting tip (30) attached after the cannula (50) is separated from the catheter hub (10). In FIG. 2, for the purpose of explaining the configuration, the hub (143) is shown before being connected to the gasket (141). In the anti-backflow catheter (1) according to the embodiment, the upper part of the hub (143) is connected to the inside of the gasket (141) and inserted, while the lower part, which has an arched cut surface, is exposed and can come into contact with the cannula (50) or the connecting tip (30).

[0054] In the following specification, the state in which the cannula (50) is mounted on the catheter hub (10) as in FIG. 2 (a) is referred to as the first state. Additionally, in the operation process of the anti-backflow catheter (1), the state in which the cannula (50) is detached from the catheter hub (10) after the needle (51) punctures the blood vessel is referred to as the second state. Additionally, the state of the anti-backflow catheter (1') in which the connecting tip (30) is attached to the catheter hub (10) after the second state is referred to as the third state. The operation process of the anti-backflow catheter (1) proceeds from the first state through the second state to the third state.

[0055] The second state is a state in which the fastening member is not connected to the catheter hub (10), and blood inside the blood vessel may flow back into the catheter hub (10) via the tube (13) due to the pressure difference between the inside and outside of the skin. Below, an embodiment of a catheter hub (10), a gasket (141), and a holder (143) may be presented, configured to prevent blood backflow in the second state and to enable the injection of fluid or medicine through the connecting tip (30) in the third state.

[0056] Each component is explained in detail below.

[0057] FIG. 5 is a cross-sectional view of a catheter hub (10) according to an embodiment of the present invention.

[0058] Referring to FIG. 5, the catheter hub (10) may have an internal space formed therein, having a first region (A1) in which a fluid path is formed and a second region (A2) in which a fastening space is formed. The catheter hub (10) may be provided as a member having a small hole formed at the front end that communicates with the internal space and an open rear end.

[0059] The internal space of the catheter hub (10) may be divided into a first region (A) and a second region (B). The first region (A) is a region where blood backflow is blocked, and a flow path may be formed therein. The flow path may be a discharge path for fluid or medication supplied from the connecting tip (30) in a third state. A conventional catheter hub may be configured to supply medication along a longitudinal central axis. In the catheter hub (10) of this embodiment, the entry and exit of the needle (51) proceed along the longitudinal central axis, but when the needle (51) exits, the central part is closed to prevent blood backflow. At this time, the medication or fluid may be discharged into the tube (13) via a flow path (103) formed on the outer circumference of the catheter hub (10) rather than the center.

[0060] The catheter hub (10) may be provided with a line-shaped partition (101) protruding longitudinally in a first region (A1). The partition (101) may be formed in multiple numbers along the inner circumferential surface of the catheter hub (10), and a fluid injection channel (103) may be formed between the multiple partitions (101). In the embodiment according to FIG. 5, the fluid channel (103) may be formed by the protruding partition (101). The partition (101) may protrude from the inner surface of the catheter hub (10) toward the longitudinal central axis, and the protrusion height of the partition (101) may be set to a length that allows for elastic compression of the gasket (141). The partition (101) may function as a seating surface for the gasket (141) in a third state. In the third state, the gasket (141) is seated on the upper surface of the partition wall (101), and a space can be formed between the gasket (141) and the flow path (103) by the partition wall (101). Accordingly, the liquid medicine discharged from the holder (143) can be injected along the flow path (103) on the inner wall surface of the catheter hub (10). In one embodiment, the partition wall (101) may be provided with an inclined surface in which the end of the protruding surface forming the boundary between the first region (A1) and the second region (A2) is cut in the shear direction. Along the cut inclined surface, the gasket (141) can be easily pressed and fitted onto the upper surface of the partition wall (101).

[0061] A catheter hub (10) may have a first inner diameter (R1) formed in a first region (A1) and a second inner diameter (R2) formed in a second region (A2). The first inner diameter (R1) may be formed smaller than the second inner diameter (R2) by the protrusion length of the partition wall (101). The first inner diameter (R1) may also be formed smaller than the second inner diameter (R2) by the internal structure of the catheter hub (10), but in this embodiment, the effective inner diameter of the first region (A1) may be reduced by the protrusion of the partition wall (101). That is, the inner diameter referred to in this specification may be an effective inner diameter, and even if the structure of the internal space has the same inner diameter as the first region (A1) and the second region (A2) except for structural differences, it may mean that the effective inner diameter is reduced by the partition wall (101) so that the first inner diameter (R1) is formed to be smaller than the second inner diameter (R2).

[0062] FIG. 4 is a perspective view of a gasket (141) and a holder (143) according to an embodiment of the present invention.

[0063] A gasket (141) is provided in the internal space of a catheter hub (10), and may have an incision (1410, FIG. 8) formed therein that allows the needle (51) to enter and exit and self-recovers when the needle (51) is removed. The gasket (141) may be made of an elastic material. The incision (1410) may be formed by a micro-cut having a minimum passing diameter of the needle (51). The incision (1410) may be located at the center of the upper surface of the gasket (141). FIG. 4 is a rear perspective view of the gasket (141), and the upper surface where the incision (1410) is formed may not be shown. The needle (51) may pass through the hollow portion of the holder (143), enter the gasket (141), and then pass through the gasket (141). When the needle (51) is removed from the gasket (141), the incision (1410) is closed by elastic restoring force, so that backflow of blood can be prevented.

[0064] The gasket (141) may include an upper disk (1413) and a lower disk (1414). The upper disk (1413) has an outer diameter smaller than the inner diameter of the first region (A1) and refers to the region into which the tip (1431) of the holder (143) is inserted. The lower disk (1414) has an outer diameter larger than the outer diameter of the upper disk (1413) to seal the second region (A2) and can be pressed into the first region (A1) by elasticity to be fixed in place.

[0065] The gasket (141) allows the lower disk (1414) to move from the second inner diameter (R2) to the first inner diameter (R1) by the pressure of the holder (143). The area in which the holder (143) is received is the internal space of the lower disk (1414), and the location of the area in which the holder (143) is received may be the location of the lower disk (1414).

[0066] At this time, the outer surface of the lower disk (1414) can be fitted and fixed to the upper surface of the partition wall (101) of the first region (A1). The lower disk (1414) can be formed of an elastic material, and when pressed from the second inner diameter (R2) to the first inner diameter (R1), the circumferential surface of the disk can be bent and deformed backward. The lower disk (1414) can be accommodated in the first inner diameter (R1) with its distal portion bent while maintaining the basic shape of its circumferential surface.

[0067] A holder (143) is provided in the internal space of a catheter hub (10), and its front end is fastened to the inside of a gasket to apply pressure to the gasket (141). The pressure applied by the holder (143) may be caused by a member fastened to the rear end of the holder (143). The member fastened to the rear end of the holder (143) may be a cannula (50) or a connecting tip (30). The holder (143) has a body formed with a through hole for the needle (51) or liquid medicine to enter and exit, and the body may include a front end (1431) fastened to the gasket (141) and a rear end (1433) having an incision surface (1430) formed in one area of ​​the outer surface.

[0068] The front section (1431) can be inserted up to the upper disk (1413) of the gasket (141) to form a fastening step with the lower disk (1414). The front section (1431) can be inserted and fastened to the upper disk (1413) of the gasket (141) to seal the internal space of the upper disk (1413). At least one cut surface (1430) can be formed in the rear section (1433). The cut surface (1430) can be arranged symmetrically or asymmetrically on the periphery of the rear section (1433). The cut surface (1430) can form a through hole communicating with the outer frame of the periphery of the rear section (1433). The through hole can provide a path for the liquid or fluid injected from the connecting tip (30) to flow into the flow path (103). The cut surface (1430) can be formed as a square, arch, semicircle, ellipse, triangle, polygon, or a combination thereof, and the number thereof can be 2, 3, 4, or more.

[0069] In the third state, where the holder (143) is connected to the rear end (1433) by the connecting tip (30) for injecting the liquid medicine, the fluid or liquid medicine flowing in from the connecting tip (30) cannot flow into the catheter hub (10) through the gasket (141). This is because the opening (1410) of the gasket (141) is closed, and the front end (1431) of the holder (143) is inserted into the gasket (141) and the internal space of the gasket (141) is sealed. Therefore, the fluid or liquid medicine flowing in from the connecting tip (30) flows into the internal space of the catheter hub (10) through the opening (1430) of the rear end (1433). At this time, the gasket (141) is fitted into the first inner diameter (R1), and fluid or medicine flows into the gap space where the flow path (103) of the catheter hub (10) is formed, and can be discharged through the small hole of the catheter hub (10).

[0070] When transitioning from the second state to the third state, the holder (143) is pressed during the fastening process of the connecting tip (30). As the holder (143) is pressed, the holder (143) presses the gasket (141) in the forward direction. The gasket (141) moves from a first position in the internal space to a second position in the forward direction due to the pressure of the holder (143), and the first position of the gasket (141) may be formed in the second area (A2) and the second position of the gasket (141) may be formed in the first area (A1). Here, the position of the gasket (141) is based on the position of the lower disk (1414).

[0071] FIG. 6 is a diagram showing the usage state of a reflux prevention catheter (1) according to an embodiment of the present invention. FIG. 6 (a) illustrates a first state of the reflux prevention catheter (1). FIG. 6 (b) illustrates a second state of the reflux prevention catheter (1). FIG. 6 (c) illustrates a third state of the reflux prevention catheter (1).

[0072] Referring to FIG. 6, in the first state where the cannula (50) is connected to the catheter hub (10), the gasket (141) is positioned in the first position of the internal space. The first position is located in the second region (A2). When the gasket (141) is maintained in the first position, it seals the first region (A1). Additionally, in the second state where the cannula (50) is detached from the catheter hub (10), the gasket (141) is still positioned in the first position. That is, the gasket (141) can still seal the first region (A1) when it is maintained in the first position in both the first and second states. At this time, blood backflow may occur in the second state (Fig. 6(b), but blood backflow from the catheter hub (10) can be prevented as the gasket (141) seals the first region (A1).

[0073] Meanwhile, in a third state where a connecting tip (30) for injecting medication is attached to the catheter hub (10), the gasket (141) may be in a second position. The movement of the gasket (141) from the first position to the second position is achieved by the connecting tip (30) pressing the holder (143) and the holder (143) pressing the gasket (141). The second position is located in the first area (A). While the gasket (141) is located in the first area (A), the lower disk (1414) is pressed, and the flow path (103) can be opened. FIG. 7 is a perspective view of the catheter hub (10) in the P-section disclosed in FIG. 6 (c).

[0074] Referring to FIG. 7, a cut surface can be seen in which a gasket (141) is inserted into a first region (A1) and the outer surface of the gasket (141) is in contact with the upper surface of the partition wall (101). In this structure, the fluid or drug solution can be opened. Thus, as described above, the fluid or drug solution flowing through the cut surface (1430) of the holder (143) passes through the fluid channel (101), and the fluid channel (101) is connected to the small hole of the catheter hub (10), allowing the fluid or drug solution to flow out through the tube (13) and be delivered into the blood vessel.

[0075] FIG. 8 illustrates a flow path through which a drug solution is injected in a backflow prevention catheter (1) according to an embodiment of the present invention. FIG. 8 (a) illustrates a cross-sectional view of the inside of the catheter hub (10) in a second state. Referring to FIG. 8 (a), when the needle (51) is withdrawn, the opening (1410) of the gasket (141) closes, and as the gasket (141) seals the first region (A1), it can be seen that backflow of blood is prevented.

[0076] FIG. 8(b) illustrates a cross-sectional view of the inner side of the catheter hub (10) in a third state. Referring to FIG. 8(b), both the gasket (141) and the hub (143) are positioned in a first region (A1) under pressure, and it can be seen that the fluid or medicine of the connecting tip (30) flows out along the incision surface (1430) through the path of the flow path (103) formed on the outer side of the gasket (141) and the hub (143).

[0077] FIG. 9 shows the operation of a reflux prevention safety catheter (2) according to another embodiment of the present invention. FIG. 9 (a) shows the reflux prevention safety catheter (2) before puncturing a blood vessel, and FIG. 9 (b) shows the needle being withdrawn after puncturing a blood vessel of the reflux prevention safety catheter (2). In the following embodiments, another embodiment of a catheter to which the reflux prevention configuration disclosed in FIG. 2 to 8 is applied is disclosed.

[0078] Referring to FIG. 9 (a) and (b), in the anti-backflow safety catheter (2) according to the present embodiment, after the needle (51) is punctured, the slide case (600) contained within the cannula plug (60) is withdrawn during the process of withdrawing the needle (51). After the slide case (600) is sufficiently withdrawn, the catheter hub (10) is separated from the cannula plug (60), and the slide case (600) covers the area around the needle (51) that has come out of the catheter hub (10). In the embodiment of FIG. 9 (a), the point of separation from the catheter hub (10) is the area of ​​the block socket (40) attached to the front end of the slide case (600). That is, the catheter hub (10) and the block socket (40) are separated when the needle (51) is withdrawn.

[0079] When the first use of the anti-backflow safety catheter (2) is completed and the slide case (600) is withdrawn, an irreversible mechanism must be implemented so that the slide case (600) is not re-inserted into the cannula plug (60). The irreversible mechanism prevents the slide case (600) from being re-inserted into the cannula plug (60) as the locking pivot (70), which will be described later, blocks the end of the needle (51) within the block socket (40). Therefore, the slide case (600) remains in the withdrawn state, covering the needle (51), and can be safely disposed of. Additionally, as the forward movement of the end of the needle (51) is blocked by the locking pivot (70), the needle (51) is not ejected to the outside even if it is re-coupled to the catheter hub (10). Hereinafter, the configuration of the anti-backflow safety catheter (2) according to the present embodiment is described, and the aforementioned mechanism is described in detail.

[0080] FIG. 10 is a cross-sectional view of a backflow prevention safety catheter (2) according to the embodiment of FIG. 9. More precisely, it shows a side cross-sectional view of the backflow prevention safety catheter (2). FIG. 10 illustrates the state before the slide case (600) is withdrawn, showing the appearance of the catheter hub (10) before use. FIG. 10 may represent the state of FIG. 9(a).

[0081] A catheter hub (10) is provided with a tube (13) through which a needle (51) passes at its end. For a patient requiring frequent drug injection, the needle (51) punctures and guides the tube (13) into the blood vessel. After puncture, the needle (51) is withdrawn and the tube (13) remains in the blood vessel. In this embodiment, a fastening means may be formed on the outer circumference of the rear end of the catheter hub (10). The fastening means of the catheter hub (10) may be a step protruding outward. Generally, since the catheter hub (10) has a protruding structure formed on the outer circumference of the rear end where the cannula is inserted, the block socket (40) inserted into the catheter hub (10) may have a front end structure that is compatible with a standard catheter hub available on the market. If no fastening means is formed at the rear end of the catheter hub, it is preferable to apply a separate catheter hub (10) having a stepped structure (710, FIG. 11) that can engage the locking pivot (70) to be described later as part of the configuration of the anti-backflow safety catheter (2).

[0082] The cannula plug (60) may have a hollow cylindrical structure, but it may also be provided with a rectangular structure to prevent rotation. The cannula plug (60) may be provided with a needle (51) fixedly coupled inside. As a means to fix the needle (51), a separate inner needle housing may be provided on the inner side of the cannula plug (60). In this case, the inner needle housing is located in the inner center of the cannula plug (60), so that a space may be formed between the inner wall of the cannula plug (60) and the outer wall of the inner needle housing. A slide case (600), which will be described later, may be accommodated in this space.

[0083] The slide case (600) refers to a configuration that is fastened to the cannula plug (60), stored inside the cannula plug (60), and discharged from the cannula plug (60) to cover the needle (51). The slide case (600) may be provided as a multi-stage structure including a first slide case (601) and a second slide case (602).

[0084] The slide case (600) may have a length specification set according to the length of the needle (51). The slide case (600) may be composed of a single stage with a long length, but in this case, the cannula plug (60) also becomes longer, so the length of the catheter product itself may become longer. In the embodiment of FIG. 10, a two-stage structure in which the slide case (600) is composed of a first slide case (601) and a second slide case (602) is exemplified.

[0085] The first slide case (601) is housed inside the cannula plug (60), and a locking part (310) may be formed to prevent detachment when discharged from the cannula plug (60). The second slide case (602) is housed inside the first slide case (601), and a locking part (330) may be formed to prevent detachment when discharged from the first slide case (601).

[0086] The locking portions (310, 330) of the first slide case (601) and the second slide case (602) may each be formed at the rear end, and any known locking structure may be adopted as long as it is a structure that prevents detachment by engaging with the end structure of the cannula plug (60). In this embodiment, the slide case (600) may be provided as a rectangular structure having a hollow interior. The slide case (600) may be provided as a rectangular structure that is housed in the cannula plug (60) so as not to rotate relative to the cannula plug (60).

[0087] The block socket (40) is fitted to the rear end of the catheter hub (10), and an internal space communicating with the catheter hub (10) can be formed. The block socket (40) is coupled to the front end of the slide case (600). The block socket (40) refers to a socket that accommodates a member for blocking the re-entry of the needle (51) to prevent the reuse of the needle (51). The block socket (40) is fitted to the catheter hub (10) and can be separated when a certain force is applied. FIG. 10 illustrates the moment when the block socket (40) and the catheter hub (10) are not separated, in a state just before the cannula plug (60) is fully withdrawn. In this state, the locking pivot (70) is supported by the hub catch (710) of the catheter hub (10), which will be described later, and does not block the internal space of the block socket (40). However, at the moment the catheter hub (10) is separated from the block socket (40), the locking pivot (70) is pivoted while detaching from the hub catch (710) and blocks the internal space of the block socket (40). The internal space of the block socket (40) can accommodate a gasket (141) and a holder (143) with the backflow prevention configuration of FIGS. 2 to 8 described above.

[0088] FIG. 11 is an enlarged view of the portion in FIG. 10 where the backflow prevention configuration and the reuse prevention configuration are located. In FIG. 11, the backflow prevention configuration may be a gasket (141) and a holder (143), and this configuration is connected to the partition (101) of the catheter hub (10) to prevent backflow of blood while allowing the injection of the drug solution of the connecting tip to be connected later. The reuse prevention configuration may be a block socket (40) and a locking pivot (70).

[0089] Referring to FIG. 11, in another embodiment, a protrusion (1011) may be partially formed on the partition (101) of the catheter hub (10).

[0090] In another embodiment, the gasket (141) may have a stepped portion (1412) formed so that its upper end is caught on the protrusion (1011). In this embodiment, the gasket (141) has a stepped portion (1412) formed to be seated at a designated position inside the catheter hub (10). Accordingly, the stepped portion (1412) of the gasket (141) may be located within the first region (A1) where the partition wall (101) is formed.

[0091] The lower part of the gasket (141) is located in the second area (A2), and the holder (143) is fastened to the lower part of the gasket (141). The holder (143) is located in the second area (A2). Subsequently, when the connecting tip (30) is connected and pressurizes the holder (143), the gasket (141), including its lower part, is fully inserted into the first area (A1). At this time, the upper part of the holder (143) moves partially to the first area (A1).

[0092] In a configuration to prevent reuse, a socket cover (44) is attached to the upper part of the block socket (40). A locking pivot (70) is received inside the socket cover (44).

[0093] The locking pivot (70) may include a pivot catch portion (71) and a blocking portion (75). The pivot catch portion (71) of the locking pivot (70) may be engaged to be connected to a hub catch portion (710) formed at the rear end of the catheter hub (10). The pivot catch portion (71) is engaged with the hub catch portion (710) so that it can receive rotational force to pivot by receiving force when the hub catch portion (710) moves forward.

[0094] The blocking portion (75) is partially exposed in the internal space of the block socket (40). The blocking portion (75) may be supported by a needle (51) in some cases.

[0095] FIG. 12(a) is a catheter hub (10) of a backflow prevention safety catheter (2) according to the embodiment of FIG. 9. FIG. 12(b) shows a gasket (141) of a backflow prevention safety catheter (2) according to the embodiment of FIG. 9.

[0096] In the embodiment of FIG. 12, an additional protrusion (1011) is partially formed on the inner partition (101) as a difference from the catheter hub described above. One or more protrusions (1011) may be formed. The additionally formed protrusion (1011) can prevent the gasket (141) from entering the first region (A1) excessively during assembly.

[0097] The height of the protrusion (1011) is sufficient if it allows the gasket (141), to which no initial elastic force is applied, to be fastened to a designated position. When pressure is applied to the gasket (141), it is formed at an appropriate height so that the gasket (141) can overcome the protrusion (1011) and be inserted into the interior of the first region (A1).

[0098] The gasket (141) may have a stepped portion (1412) formed in the upper disk area as a difference from the previously described embodiment. As long as the stepped portion (1412) is structured to be caught on the protrusion (1011), a known stepped structure may be adopted.

[0099] FIG. 13 is an exploded perspective view of a configuration for preventing reuse of a backflow prevention safety catheter (2) according to the embodiment of FIG. 9. A hinge (73) may be formed on the locking pivot (70) as a means for fastening to the block socket (40). The hinge (73) may be fitted into the fastening hole (4021) of the block socket (40).

[0100] The locking pivot (70) is connected to the block socket (40) and the hinge (73) so as to be rotatable. The locking pivot (70) can be pivoted into the internal space of the socket housing (401) of the block socket (40).

[0101] A hub catch (710) is formed at the front end of the locking pivot (70). The hub catch (710) can be a protruding structure that is caught as if hooked onto the rear end of the catheter hub (10).

[0102] With the block socket (40) and the catheter hub (10) connected, the catheter hub (10) moves relatively forward or the block socket (40) moves relatively backward, thereby separating the catheter hub (10) and the block socket (40). At this time, the hub locking part (710) rotates clockwise with respect to FIG. 11. During the pivoting process of the hub locking part (710), the blocking part (75) also rotates clockwise.

[0103] The blocking portion (75) is bent at a predetermined angle from the body where the hinge (73) of the locking pivot (70) is formed, and has an area extended to a predetermined length. As the blocking portion (75) rotates clockwise with respect to FIG. 11, it occupies the internal space of the socket housing (401) and blocks the hollow formed in the hub connecting portion (402). As the hollow of the hub connecting portion (402) is blocked, the re-insertion of the needle (51) is blocked, thereby preventing the reuse of the catheter.

[0104] FIG. 14 shows the locking pivot (70) connected to the block socket (40) in a configuration for preventing reuse of FIG. 13. FIG. 14 illustrates the locking pivot (70) connected to the block socket (40) and rotated to cover the hollow of the hub connection part (402).

[0105] When the blocking portion (75) of the locking pivot (70) rotates, the locking portion (77) is engaged with a locking structure structurally formed in the socket housing (401). In this embodiment, the locking portion (77) can be engaged with the locking housing (477). The locking housing (477) has a structure that protrudes inward, so that the locking portion (77) is engaged as it rotates clockwise and can prevent counterclockwise rotation. The locking portion (77) is irreversibly engaged with the socket housing (401). Once engaged, the locking portion (77) prevents the locking pivot (70) from returning to its state before rotation unless an external force is applied to directly engage the locking portion (77). Through this process, the irreversible mechanism of the locking pivot (70) can be executed.

[0106] Although the technical concept of the present invention and disclosure has been explained by the embodiments described above, the technical concept of the present invention includes various substitutions, modifications, and changes that can be understood by those skilled in the art to which the present invention pertains. Furthermore, it should be understood that such substitutions, modifications, and changes may be included within the scope of the appended claims.

[0107]

[0108] 1: Anti-reflux catheter 10: Catheter hub

[0109] 13: Tube 30: Connection tip

[0110] 50: Cannula 51: Needle

[0111] 141: Gasket 1410: Incision

[0112] 1413: Upper disk 1414: Lower disk

[0113] 143: Holder 1430: Incision surface

[0114] 1431: Front section 1433: Rear section

[0115] 101: Bulkhead 103: Euro

[0116] 2: Anti-reflux safety catheter 40: Block socket

[0117] 401: Fastening hole 44: Socket cover

[0118] 60: Cannula plug 70: Locking pivot

[0119] 71: Pivot lock 710: Hub lock

[0120] 75: Blocking section 77: Locking section

[0121] 477: Locking housing 600: Slide case

[0122] 601: 1st slide case 602: 2nd slide case

[0123] 310, 330: Locking part 1011: Protrusion

[0124] 1412: Step section

[0125]

[0126] The present invention can be used in a backflow prevention catheter that prevents blood backflow after catheter withdrawal and allows drug solution to be injected, and in a backflow prevention safety catheter that prevents the reuse of the needle and allows it to be safely disposed of.

Claims

1. In an anti-reflux catheter, A catheter hub having an internal space formed with a first region in which a Euro is formed and a second region in which a fastening space is formed, wherein a small hole communicating with the internal space is formed at the front end and the rear end is open; A gasket made of an elastic material provided in the internal space of the catheter hub, having an opening formed therein that allows the needle of the cannula to enter and exit, and which is restored when the needle is disengaged; and A holder provided in the internal space of the catheter hub, with the front end fastened to the inside of the gasket to press the gasket; The above gasket is such that the area in which the holder is accommodated moves from a first position in the internal space to a second position in the shear direction due to the pressure of the holder, the first position is formed in the second area, and the second position is formed in the first area. The above catheter hub is, A line-shaped partition is formed protruding in the longitudinal direction in the first region, and a plurality of partitions are formed along the inner circumferential surface of the catheter hub. A backflow prevention catheter characterized by having a flow path formed between a plurality of the above partitions through which a drug solution is injected.

2. In Paragraph 1, The above gasket is, At a location provided in the above internal space, In the first state where the cannula is connected to the catheter hub, the area in which the holder is received is the first position, and In the second state where the cannula is detached from the catheter hub, the area in which the holder is received is the first position, and A backflow prevention catheter characterized in that, in a third state in which a connecting tip for injecting a drug solution is attached to the catheter hub, the area in which the holder is received is the second position.

3. In Paragraph 2, The above gasket is, In the first state and the second state above, By sealing the first region when maintained in the first position, A backflow prevention catheter characterized by preventing backflow of blood flowing into the above catheter hub.

4. In Paragraph 1, The above bulkhead is, A backflow prevention catheter characterized in that the end of the protruding surface forming the boundary between the first region and the second region is an inclined surface cut in the shear direction.

5. In Paragraph 1, The above catheter hub is, A first inner diameter is formed in the first region above, and A second inner diameter is formed in the second region above, and A backflow prevention catheter characterized by the inner diameter in the first region being reduced by the protruding length of the above partition so that the first inner diameter is formed to be smaller than the second inner diameter.

6. In Paragraph 5, The above gasket is, By applying pressure to the above holder, the lower disk that was received into the second inner diameter and sealed the first region is pressed so as to be fitted into the first inner diameter, and A backflow prevention catheter characterized by having an outer surface that is fitted and fixed to the upper surface of the partition wall in the first region.

7. In Paragraph 1, The above holder is, The body has a through hole formed therein to allow the above needle or liquid to enter and exit, The above body is, A shear portion connected to the above gasket, and A reflux prevention catheter characterized by including a rear end portion having an incision surface formed in one region of the outer surface.

8. In Paragraph 7, The above holder is, When the connecting tip for injecting the liquid medicine comes into contact with and is connected to the rear end, The liquid medicine flowing in from the above-mentioned connection tip flows into the internal space through the above-mentioned cut surface of the above-mentioned rear end, and A backflow prevention catheter characterized by being discharged into a small hole of the catheter hub along the flow path of the first region.

9. In Paragraph 1, The above gasket is, An upper disk having an outer diameter smaller than the inner diameter of the first region and into which the tip of the holder is inserted; and A backflow prevention catheter characterized by including: a lower disc having an outer diameter larger than that of the upper disc, which seals the second region, and which is pressed into the first region by elasticity and fixed in place.

10. In a reflux prevention safety catheter, A catheter hub having an internal space formed with a first region in which a Euro is formed and a second region in which a fastening space is formed, wherein a small hole communicating with the internal space is formed at the front end and the rear end is open; A gasket made of an elastic material provided in the internal space of the above catheter hub, having an opening formed therein that allows the needle of the following cannula plug to enter and exit, and is restored when the needle is disengaged; and A holder provided in the internal space of the catheter hub, with its front end fastened to the inside of the gasket to press the gasket; A cannula plug in which the above needle is provided; A slide case that is fastened to the cannula plug, received inside the cannula plug, and discharged from the cannula plug to cover the needle; A block socket fitted to the rear end of the catheter hub, having a hollow formed therein communicating with the catheter hub, and coupled to the front end of the slide case; and A locking pivot is housed inside the block socket and has a pivot catch formed on one side that engages with the rear end of the catheter hub, and a blocking portion formed extending from the pivot catch and bent inward toward the block socket. The above gasket is such that the area in which the holder is accommodated moves from a first position in the internal space to a second position in the shear direction due to the pressure of the holder, the first position is formed in the second area, and the second position is formed in the first area. A backflow prevention safety catheter characterized by a flow path formed between a plurality of the above partitions for injecting a drug solution, and the locking pivot rotating as the catheter hub separates from the block socket so that the blocking part blocks the re-entry of the needle.

Images