A diameter-adjustable needle and an indwelling needle using the needle

Abstract

The present invention relates to the field of medical device technology, and specifically to a diameter-adjustable needle and an indwelling needle using the needle. The diameter-adjustable needle includes an inner tube and an outer puncture tube. The inner tube includes an inner tube body, and a vacancy is provided on the outer puncture tube. The outer puncture tube sleeved on the inner tube body is used to constrain the shape of the inner puncture tube body. In the process of the diameter-adjustable needle piercing the blood vessel, the outer puncture tube and the inner puncture tube body are inserted into the patient's blood vessel together. By bending the outer puncture tube, the outer puncture tube can be deformed, the width of the vacancy is increased, and the inner tube body can be separated from the outer puncture tube through the vacancy. After the outer puncture tube is separated from the inner tube body, the inner tube body is not constrained by the outer puncture tube, so that the inner tube body expands. The diameter-adjustable needle of the present application and the indwelling needle using the needle can make the flow of liquid medicine smoother, improve the convenience of puncture, and also facilitate in vitro observation of whether the puncture is in place.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a diameter-adjustable needle and an indwelling needle using the needle. Background Art

[0002] Indwelling needles are a type of medical device that is commonly used in hospital nursing work. The use of indwelling needles can alleviate the pain of repeated punctures for patients and reduce the workload of medical staff.

[0003] The indwelling needle currently used includes an indwelling needle tube and a puncture needle core. When it is necessary to inject drugs into the patient, the indwelling needle tube is punctured into the patient's blood vessel under the action of the puncture needle core. After the indwelling needle tube reaches the preset position, it is only necessary to pull out the puncture needle core from the indwelling needle tube, so that one end of the indwelling needle tube remains in the patient's blood vessel, which is convenient for repeated injection of drugs into the patient and reduces the pain of repeated punctures for the patient.

[0004] Although the current indwelling needle can reduce the pain of repeated punctures in patients during use, the inventors have found that the current indwelling needle still has shortcomings, specifically:

[0005] Since the current indwelling needle tube is sleeved on the outside of the puncture needle core, in order to ensure that the indwelling needle tube and the puncture needle core move together during the puncture process, usually, the puncture needle core is arranged in close contact with the indwelling needle tube, so that the gap between the puncture needle core and the indwelling needle tube is small, so as to prevent more liquid from passing through the gap between the puncture needle core and the indwelling needle tube during the puncture process, so as to ensure the stability of the relative position between the puncture needle core and the indwelling needle tube;

[0006] However, during the infusion process, the inner diameter of the indwelling needle affects the infusion speed. The thickness of the indwelling needle corresponds to the inner diameter of the indwelling needle. For a thicker indwelling needle, the drug solution can flow more smoothly and is not easy to be blocked, but its puncture needle core is thicker and it is not convenient to puncture into the blood vessel; for a thinner indwelling needle, although it is easy to puncture, due to its small inner diameter, it is easy to block the human tissue and cause bleeding, and the infusion speed is slow, which is not convenient for infusion.

[0007] Therefore, based on the above-mentioned shortcomings, there is an urgent need to design an indwelling needle that can improve the convenience of puncture and make the flow of liquid medicine smoother. Summary of the invention

[0008] The purpose of the present invention is to provide a diameter-adjustable needle and an indwelling needle using the needle in view of the above-mentioned shortcomings of the current indwelling needle in actual use, so as to improve the convenience of puncture and make the flow of drug solution smoother.

[0009] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0010] A diameter-adjustable needle, comprising an inner tube and an outer puncture tube, wherein the inner tube comprises an inner tube body, the outer puncture tube is used to be sleeved on the inner tube body, the inner tube body can move relative to the length direction of the outer puncture tube, and the outer puncture tube is provided with a vacancy, which is arranged along the length direction of the outer puncture tube;

[0011] The outer puncture tube sleeved on the inner tube body is used to constrain the shape of the inner puncture tube body. During the process of the adjustable diameter needle piercing the blood vessel, the outer puncture tube and the inner puncture tube body are inserted into the patient's blood vessel together;

[0012] By bending the outer puncture tube, the outer puncture tube can be deformed, the width of the gap can be increased, and the inner tube body can be separated from the outer puncture tube through the gap. After the outer puncture tube and the inner tube body are separated, the inner tube body is not constrained by the outer puncture tube, so that the inner tube body expands.

[0013] As a preferred technical solution of the present application, the internal tube body includes a plurality of bone rods and a film, wherein the plurality of bone rods are distributed around the central axis of the internal tube body, the film is arranged between adjacent bone rods, and the film and the bone rods form a first channel for liquid circulation;

[0014] The bone rod is used to support the internal tube body;

[0015] When the outer puncture tube is sleeved on the inner tube body, the bone rods are retracted to reduce the cross-sectional area of ​​the first channel;

[0016] When the inner tube body is inserted into the blood vessel and is not sheathed by the outer puncture tube, a plurality of the bone rods are spread apart to increase the cross-sectional area of ​​the first channel.

[0017] As a preferred technical solution of the present application, the internal tube body further includes a plurality of support members, the support members are ring-shaped, the support members are elastic, the support members are connected to a plurality of the bone rods, and the plurality of the support members are distributed along the length direction of the bone rods;

[0018] When the outer puncture tube is sleeved on the inner tube body, the support member located in the outer puncture tube is squeezed and deformed, so that the bone rods are retracted;

[0019] When the inner tube body is not sleeved by the outer puncture tube, the support member recovers its deformation, so that the bone rod changes from a contracted state to an open state.

[0020] As a preferred technical solution of the present application, the bone rod comprises a first bone rod and a second bone rod, a first elastic membrane is arranged between the first bone rod and the second bone rod, the first elastic membrane is elastic, the first elastic membrane is in an annular structure adapted to the internal tube body, one end of the first elastic membrane is connected to a plurality of the first bone rods, and the other end of the first elastic membrane is connected to a plurality of the second bone rods;

[0021] When the second bone rod moves relative to the first bone rod along the length direction of the first bone rod, the first elastic membrane is deformed.

[0022] As a preferred technical solution of the present application, at least one of the supporting members is connected between a plurality of the first bone bars;

[0023] At least one of the supporting members is connected between a plurality of the second bone rods.

[0024] As a preferred technical solution of the present application, the internal tube also includes a booster handle, which includes a booster handle body and a handle. Medical personnel can hold the handle to push the booster handle body to move, so that the booster handle body drives the internal tube to move.

[0025] As a priority technical solution of the present application, the embedded tube also includes a leak-proof top, which is a conical structure. The leak-proof top connects the embedded tube body and the booster handle body. The leak-proof top is used to prevent liquid from leaking out of the puncture port when the embedded tube is inserted into the blood vessel.

[0026] As a preferred technical solution of the present application, the internal tube further comprises a connection port, the connection port is connected to the booster handle body, and the connection port is used to connect an infusion pump or a three-way tube.

[0027] As a preferred technical solution of the present application, the distance between the first bone rod and the booster handle is smaller than the distance between the second bone rod and the booster handle;

[0028] A plurality of the first bone rods and the film form a first section of the internal tube, and a plurality of the second bone rods and the film form a second section of the internal tube;

[0029] An overlapping area is provided between the first section of the built-in tube and the second section of the built-in tube. In the overlapping area, the first section of the built-in tube is sleeved on the outside of the second section of the built-in tube.

[0030] As a preferred technical solution of the present application, a slope is provided on the first bone rod, and the slope is adapted to the second bone rod;

[0031] When the second bone rod moves relative to the first bone rod and moves toward the direction close to the booster handle, the slope causes the ends of the plurality of second bone rods close to the first bone rod to gradually converge and form a blocking area, which is a gap formed by the first and second sections of the built-in tube and the first elastic membrane;

[0032] The larger the distance that the second bone rod moves toward the direction approaching the boosting handle, the larger the blocking area formed.

[0033] As a preferred technical solution of the present application, two outer tube handles are provided on the outer puncture tube, and the outer tube handles are located on both sides of the vacancy.

[0034] The present invention also provides an indwelling needle, comprising the diameter-adjustable needle as described above.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. In the scheme of the present application, the outer puncture tube is sleeved on the inner tube body. During the puncture process, the outer puncture tube punctures the patient's skin and pierces the patient's blood vessel together with the inner tube body. Then, the inner tube body is continuously extended into the patient's blood vessel, and the outer puncture tube is pulled out of the patient's body, so that the outer puncture tube moves relative to the inner tube body. In this way, the outer puncture tube guides the inner tube body to pierce the patient's blood vessel. At the same time, after the outer puncture tube is extended out of the patient's body, the outer puncture tube is deformed by bending the outer puncture tube to increase the width of the gap, so that the inner tube body can pass through the gap and separate from the outer puncture tube, thereby completing the arrangement of the inner tube on the patient's body;

[0037] After the outer puncture tube is separated from the inner tube body, the inner tube body is free from the constraint of the outer puncture tube, so that the inner tube body expands, thus increasing the diameter of the inner tube, which can make the drug flow more smoothly, and in the process of inserting the inner tube body and the outer puncture tube into the patient's blood vessel together, the outer puncture tube constrains the inner tube body, so that the inner tube body is in a contracted state, which can reduce the cross-sectional size of the inner tube body, thereby reducing the diameter of the outer puncture tube, thereby improving the convenience of puncture; thus, the size of the inner tube body and the outer puncture tube can be shortened, which is more conducive to the diameter-adjustable needle of the present application piercing the patient's skin and then piercing the patient's blood vessel, and at the same time, relying on the expansion of the inner tube body, during the process of drug liquid input, the inner tube body has a larger inner diameter, which is more conducive to the input of drug liquid, thereby improving the convenience of puncture and the smoothness of drug liquid flow;

[0038] Furthermore, since the puncture needle core is not provided in the inner tube body, during the puncture process, when the inner tube body and the outer puncture tube are inserted into the patient's blood vessel together, it is convenient for the blood in the blood vessel to flow into the inner tube body, so that it is convenient for medical staff to observe whether the puncture is in place in vitro;

[0039] 2. Furthermore, by providing a plurality of bone rods and a thin film, the thin film and the bone rods form a first channel for liquid circulation, and when the external puncture tube is sleeved on the internal tube body, the plurality of bone rods are retracted and the cross-sectional area of ​​the first channel is reduced, so that the internal tube body is in a contracted state, and when the internal tube body is inserted into the blood vessel and is not sleeved by the external puncture tube, the plurality of bone rods are stretched open, so that the cross-sectional area of ​​the first channel is increased, so as to ensure the smoothness of the infusion during the subsequent infusion process;

[0040] 3. Further, by arranging a first elastic membrane between the first bone rod and the second bone rod, the first elastic membrane is in an annular structure adapted to the implanted tube body, and one end of the first elastic membrane is connected to a plurality of first bone rods, and the other end of the first elastic membrane is connected to a plurality of second bone rods, so that in the process of inserting the implanted tube into the patient's blood vessel, when the end of the implanted tube body touches the blood vessel wall or the movement of the implanted tube body is blocked, the second bone rod can move relative to the first bone rod along the length direction of the first bone rod, so that the first elastic membrane is deformed, thereby changing the length of the implanted tube body, and when one side of the end of the implanted tube body is blocked, the first bone rod and the second bone rod at the blocked position move relatively more, and the first bone rod and the second bone rod away from the blocked position move relatively less, so that the end of the implanted tube body can be transformed from a horizontal state to an inclined state, so that the inclined end can guide the movement of the implanted tube body, thereby improving the smoothness of the movement of the implanted tube body in the blood vessel;

[0041] 4. Furthermore, by setting a slope, during the process of inserting the catheter into the patient's blood vessel, when the front end of the catheter abuts against the blood vessel wall, the second bone rod moves relative to the first bone rod and moves toward the booster handle, so that the end of the second bone rod close to the first bone rod gradually closes and forms a blocking area. The blocking area can reduce the flow of liquid from the first section of the catheter to the second section of the catheter, increase the resistance to liquid flow, and thus reduce the impact of the drug solution on the blood vessel wall. In particular, when there is no medical staff to take care of the patient and the patient is receiving an infusion, when the patient accidentally moves the catheter, the effect of reducing the impact of the drug solution on the blood vessel wall is more obvious. , which can improve the comfort of patient infusion; at the same time, because the end of the second bone rod close to the first bone rod is gathered to form a blocking area, when a large flow rate of liquid medicine is input into the internal tube body, the liquid medicine impacts the blocking area, and the end of the second bone rod close to the first bone rod can be bent and deformed, which can further increase the bending degree of the end of the second bone rod close to the first bone rod to further increase the size of the blocking area, so that the end of the second bone rod close to the first bone rod is more gathered, further hindering the liquid medicine from flowing from the first section of the internal tube to the second section of the internal tube, thereby further reducing the impact of the liquid medicine on the inner wall of the blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a schematic structural diagram of the inner tube and the outer puncture tube in one embodiment of a diameter-adjustable needle of the present application when they cooperate with each other;

[0043] Figure 2 This is a schematic diagram of the structure of an inner tube and an outer puncture tube when they are separated in one embodiment of a diameter-adjustable needle of the present application;

[0044] Figure 3 This is a schematic structural diagram of an outer puncture tube in one embodiment of a diameter-adjustable needle of the present application before and after being bent;

[0045] Figure 4 This is a schematic diagram of the structure of an internal tube in one embodiment of a diameter-adjustable needle of the present application;

[0046] Figure 5 This is a partial structural schematic diagram of an internal tube in one embodiment of a diameter-adjustable needle of the present application;

[0047] Figure 6 A diameter adjustable needle is provided for this application Figure 5 A schematic diagram of the enlarged structure of part A;

[0048] Figure 7 This is a partial cross-sectional structural schematic diagram of an internal tube in one embodiment of a diameter-adjustable needle of the present application;

[0049] Figure 8 This is a schematic structural diagram of a first bone rod and a second bone rod in one embodiment of a diameter-adjustable needle of the present application when they cooperate with each other;

[0050] Markings in the figure: 1-internal tube, 2-external puncture tube, 3-internal tube body, 4-gap, 5-bone rod, 6-film, 7-first channel, 8-support, 9-first bone rod, 10-second bone rod, 11-first elastic membrane, 12-boosting handle, 13-push handle body, 14-handle, 15-leak-proof top, 16-connecting port, 17-internal tube section 1, 18-internal tube section 2, 19-overlapping area, 20-slope, 21-blocking area, 22-external tube handle. DETAILED DESCRIPTION

[0051] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0052] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0054] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0055] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0056] Embodiment 1

[0057] This embodiment provides a diameter-adjustable needle, see Figure 1-Figure 7As shown, it includes an internal tube 1 and an external puncture tube 2, the internal tube 1 includes an internal tube body 3, the external puncture tube 2 is used to be sleeved on the internal tube body 3, the internal tube body 3 can move relative to the length direction of the external puncture tube 2, and the external puncture tube 2 is provided with a vacancy 4, and the vacancy 4 is arranged along the length direction of the external puncture tube 2;

[0058] The outer puncture tube 2 sleeved on the inner tube body 3 is used to constrain the shape of the inner puncture tube body. During the process of the adjustable diameter needle piercing the blood vessel, the outer puncture tube 2 and the inner puncture tube body are inserted into the patient's blood vessel together;

[0059] By bending the outer puncture tube 2, the outer puncture tube 2 can be deformed, the width of the gap 4 can be increased, and the inner tube body 3 can be separated from the outer puncture tube 2 through the gap 4. After the outer puncture tube 2 and the inner tube body 3 are separated, the inner tube body 3 is not constrained by the outer puncture tube 2, so that the inner tube body 3 can expand.

[0060] In the present application, the outer puncture tube 2 is sleeved on the inner tube body 3. During the puncture process, the outer puncture tube 2 punctures the patient's skin and pierces the patient's blood vessel together with the inner tube body 3. Then, the inner tube body 3 is continuously extended into the patient's blood vessel, and the outer puncture tube 2 is pulled out of the patient's body, so that the outer puncture tube 2 moves relative to the inner tube body 3. In this way, the outer puncture tube 2 guides the inner tube body 3 to pierce the patient's blood vessel. At the same time, after the outer puncture tube 2 is extended out of the patient's body, the outer puncture tube 2 is deformed by bending the outer puncture tube 2, so that the width of the vacancy 4 is increased, so that the inner tube body 3 can be separated from the outer puncture tube 2 after passing through the vacancy 4, thereby completing the arrangement of the inner tube 1 on the patient's body;

[0061] After the outer puncture tube 2 is separated from the inner tube body 3, the inner tube body 3 is free from the constraint of the outer puncture tube 2, so that the inner tube body 3 expands, so that the diameter of the inner tube 1 increases, which can make the flow of the drug solution smoother, and in the process of inserting the inner tube body 3 and the outer puncture tube 2 into the patient's blood vessel together, the outer puncture tube 2 constrains the inner tube body 3, so that the inner tube body 3 is in a contracted state, which can reduce the cross-sectional size of the inner tube body 3, thereby reducing the diameter of the outer puncture tube 2, thereby improving the convenience of puncture; thus, the size of the inner tube body 3 and the outer puncture tube 2 can be shortened, which is more conducive to the diameter-adjustable needle of the present application piercing the patient's skin and then piercing the patient's blood vessel, and at the same time, relying on the expansion of the inner tube body 3, during the process of drug solution input, the inner tube body 3 has a larger inner diameter, which is more conducive to the input of drug solution, thereby improving the convenience of puncture and the smoothness of drug solution flow;

[0062] Furthermore, since no puncture needle core is provided in the internal tube body 3, during the puncture process, when the internal tube body 3 and the external puncture tube 2 are inserted into the patient's blood vessel together, it is convenient for the blood in the blood vessel to flow into the internal tube body 3, so that it is convenient for medical staff to observe whether the puncture is in place in vitro;

[0063] Meanwhile, during the process of pulling out the diameter-adjustable needle of the present application from the patient's body, the medical staff applies an external force to the internal tube body 3 to pull the internal tube body 3 out of the patient's body.

[0064] As a preferred embodiment, on the basis of the above-mentioned manner, further, the built-in tube body 3 includes a plurality of bone rods 5 and a film 6, the plurality of bone rods 5 are distributed around the central axis of the built-in tube body 3, the film 6 is arranged between adjacent bone rods 5, and the film 6 and the bone rods 5 form a first channel 7 for liquid circulation;

[0065] The bone rod 5 is used to support the built-in tube body 3;

[0066] When the outer puncture tube 2 is sleeved on the inner tube body 3, the bone rods 5 are retracted to reduce the cross-sectional area of ​​the first channel 7;

[0067] When the inner tube body 3 pierces the blood vessel and is not sheathed by the outer puncture tube 2 , a plurality of the bone rods 5 are spread apart to increase the cross-sectional area of ​​the first channel 7 .

[0068] Furthermore, by setting a plurality of bone rods 5 and a thin film 6, the thin film 6 and the bone rods 5 form a first channel 7 for liquid circulation, and when the external puncture tube 2 is sleeved on the internal tube body 3, the plurality of bone rods 5 are retracted and the cross-sectional area of ​​the first channel 7 is reduced, so as to facilitate the internal tube body 3 to be in a contracted state. When the internal tube body 3 is inserted into the blood vessel and is not sleeved by the external puncture tube 2, the plurality of bone rods 5 are stretched open, so as to facilitate increasing the cross-sectional area of ​​the first channel 7, so as to facilitate ensuring the smoothness of the infusion during the subsequent infusion process.

[0069] As a preferred embodiment, on the basis of the above-mentioned manner, further, the built-in tube body 3 further includes a plurality of support members 8, the support members 8 are ring-shaped, the support members 8 are elastic, the support members 8 are connected to a plurality of the bone rods 5, and the plurality of the support members 8 are distributed along the length direction of the bone rods 5;

[0070] When the outer puncture tube 2 is sleeved on the inner tube body 3, the support member 8 located inside the outer puncture tube 2 is squeezed and deformed, so that the bone rods 5 are retracted;

[0071] When the inner tube body 3 is not sleeved by the outer puncture tube 2, the support member 8 recovers its deformation, so that the bone rod 5 changes from the contracted state to the spread state.

[0072] Furthermore, by providing a support member 8, the support member 8 is connected to a plurality of bone rods 5, so that a horizontal and vertical structure is formed between the support member 8 and the bone rods 5. When the plurality of bone rods 5 are folded together, the support member 8 is squeezed and deformed. When the internal tube body 3 is not sleeved by the external puncture tube 2, the support member 8 restores the deformation, so that the bone rods 5 are transformed from a folded state to a dispersed state. In this way, the support member 8 can play the purpose of auxiliary support and auxiliary dispersion of the bone rods 5, and the support member 8 and the bone rods 5 can form a bracket structure, which can improve the stability of the formed first channel 7.

[0073] Embodiment 2

[0074] Based on the technical solution of embodiment 1, further, see Figure 1-Figure 7 As shown, the bone rod 5 includes a first bone rod 9 and a second bone rod 10, a first elastic membrane 11 is arranged between the first bone rod 9 and the second bone rod 10, the first elastic membrane 11 is elastic, and the first elastic membrane 11 is an annular structure adapted to the built-in tube body 3, one end of the first elastic membrane 11 is connected to a plurality of the first bone rods 9, and the other end of the first elastic membrane 11 is connected to a plurality of the second bone rods 10;

[0075] When the second bone rod 10 moves relative to the first bone rod 9 along the length direction of the first bone rod 9, the first elastic membrane 11 is deformed.

[0076] Furthermore, by arranging the first elastic membrane 11 between the first bone rod 9 and the second bone rod 10, the first elastic membrane 11 is in an annular structure adapted to the implanted tube body 3, and one end of the first elastic membrane 11 is connected to a plurality of first bone rods 9, and the other end of the first elastic membrane 11 is connected to a plurality of second bone rods 10. In this way, when the implanted tube 1 is inserted into the patient's blood vessel, when the end of the implanted tube body 3 touches the blood vessel wall or the movement of the implanted tube body 3 is blocked, the second bone rod 10 can be moved relative to the first bone rod 9 along the length of the first bone rod 9. The first elastic membrane 11 is deformed by the movement, thereby changing the length of the embedded tube body 3, and when one side of the end of the embedded tube body 3 is blocked, the first bone rod 9 and the second bone rod 10 at the blocked position move relative to each other to a greater extent, and the first bone rod 9 and the second bone rod 10 away from the blocked position move relative to each other to a smaller extent, so that the end of the embedded tube body 3 can be transformed from a horizontal state to an inclined state, so that the inclined end can guide the movement of the embedded tube body 3, thereby improving the smoothness of the movement of the embedded tube body 3 in the blood vessel.

[0077] As a preferred embodiment, based on the above method, further, at least one of the supporting members 8 is connected between a plurality of the first bone bars 9;

[0078] At least one of the supporting members 8 is connected between a plurality of the second bone bars 10 .

[0079] Furthermore, at least one support member 8 is connected between the first bone bars 9, and at least one support member 8 is connected between the second bone bars 10. In this way, the support member 8 can connect the first bone bars 9, and other support members 8 can connect the second bone bars 10, so that the support member 8 can play an auxiliary expansion role, respectively expanding the corresponding first bone bars 9 and expanding the corresponding second bone bars 10.

[0080] Embodiment 3

[0081] Based on the technical solution of embodiment 2, further, see Figure 1-Figure 7 As shown, the internal tube 1 also includes a booster handle 12, and the booster handle 12 includes a booster handle body 13 and a handle 14. Medical personnel can hold the handle 14 to push the booster handle body 13 to move, so that the booster handle body 13 drives the internal tube 1 to move.

[0082] Furthermore, by providing the booster handle body 13 and the handle 14 , medical personnel can push the booster handle body 13 to move by holding the handle 14 , so that the booster handle body 13 drives the built-in tube body 3 to move, thereby achieving the purpose of pushing the built-in tube body 3 to move.

[0083] As a preferred embodiment, on the basis of the above-mentioned method, further, the internal tube 1 also includes a leak-proof top 15, which is a conical structure. The leak-proof top 15 connects the internal tube body 3 and the booster handle body 13. The leak-proof top 15 is used to prevent liquid from seeping out from the puncture port when the internal tube 1 is inserted into the blood vessel.

[0084] Furthermore, by setting a leak-proof top 15, setting the leak-proof top 15 into a cone-shaped structure, the leak-proof top 15 connects the embedded tube body 3 and the booster handle body 13. After the embedded tube body 3 pierces the blood vessel, the booster handle body 13 is continuously pushed to move, so that the leak-proof top 15 is against the patient's puncture port, thereby preventing liquid from seeping out of the puncture port and reducing the workload of medical staff for cleaning and care.

[0085] As a preferred embodiment, based on the above-mentioned manner, further, the internal tube 1 also includes a connecting port 16, and the connecting port 16 is connected to the booster handle body 13, and the connecting port 16 is used to connect an infusion set or a three-way tube.

[0086] Furthermore, by connecting the connection port 16 to the booster handle body 13 , the connection port 16 can be connected to an infusion set or a three-way tube, thereby improving the convenience of connecting the infusion set or the three-way tube to the needle.

[0087] Embodiment 4

[0088] Based on the technical solution of embodiment 3, further, see Figure 1-Figure 8 As shown, the distance between the first bone bar 9 and the booster handle 12 is smaller than the distance between the second bone bar 10 and the booster handle 12;

[0089] A plurality of the first bone rods 9 and the film 6 form an internal tube section 17, and a plurality of the second bone rods 10 and the film 6 form an internal tube section 2 18;

[0090] An overlapping area 19 is provided between the first inner tube section 17 and the second inner tube section 18 . In the overlapping area 19 , the first inner tube section 17 is sleeved on the outer side of the second inner tube section 18 .

[0091] Furthermore, an overlapping area 19 is provided between the first and second sections of the built-in tube 17, 18, and within the overlapping area 19, the first section of the built-in tube 17 is sleeved on the outside of the second section of the built-in tube 18. Thus, on the one hand, the stability of the first section of the built-in tube 17 when it moves relative to the second section of the built-in tube 18 can be improved, and on the other hand, the built-in tube body 3 can be prevented from bending in the transition area between the first section of the built-in tube 17 and the second section of the built-in tube 18, thereby improving the stability of the first channel 7 formed by the built-in tube body 3. On still another hand, the first section of the built-in tube 17 is sleeved on the outside of the second section of the built-in tube 18, and in the process of withdrawing the built-in tube 1 from the patient's blood vessel, the smoothness of withdrawing the built-in tube 1 can be improved.

[0092] As a preferred embodiment, based on the above method, further, the first bone bar 9 is provided with a slope 20, and the slope 20 is adapted to the second bone bar 10;

[0093] When the second bone rod 10 moves relative to the first bone rod 9 and moves toward the direction close to the booster handle 12, the slope 20 gradually brings together the ends of the second bone rods 10 close to the first bone rod 9 and forms a blocking area 21, which is a gap formed by the first section 17, the second section 18 and the first elastic membrane 11.

[0094] The greater the distance that the second bone rod 10 moves toward the boosting handle 12 , the larger the blocking area 21 formed.

[0095] Furthermore, by providing the slope 20, in the process of inserting the implanted catheter 1 into the patient's blood vessel, when the front end of the implanted catheter 1 abuts against the blood vessel wall, the second bone rod 10 moves relative to the first bone rod 9 and moves toward the direction of the booster handle 12, so that the end of the second bone rod 10 close to the first bone rod 9 gradually shrinks and forms a blocking area 21. The blocking area 21 can reduce the flow of liquid from the first implanted catheter section 17 to the second implanted catheter section 18, and can increase the resistance to liquid flow, thereby reducing the impact of the drug solution on the blood vessel wall. Especially when there is no medical staff to take care of the patient and the patient is receiving an infusion, when the patient accidentally moves the implanted catheter 1, the effect of reducing the impact of the drug solution on the blood vessel wall is more obvious. The comfort of the patient's infusion can be improved; at the same time, because the end of the second bone rod 10 close to the first bone rod 9 is gathered to form a blocking area 21, when a drug with a large flow rate is input into the internal tube body 3, the drug impacts the blocking area 21, and the end of the second bone rod 10 close to the first bone rod 9 can be bent and deformed, and the bending degree of the end of the second bone rod 10 close to the first bone rod 9 can be further increased to further increase the size of the blocking area 21, so that the end of the second bone rod 10 close to the first bone rod 9 is more gathered, further hindering the drug from flowing from the first internal tube section 17 to the second internal tube section 18, thereby further reducing the impact of the drug on the inner wall of the blood vessel;

[0096] In the present application, the first bone bar 9 and the second bone bar 10 cooperate with each other through the sliding groove and slider structure, which can improve the stability of the second bone bar 10 moving relative to the first bone bar 9.

[0097] As a preferred embodiment, on the basis of the above-mentioned manner, further, two outer tube handles 22 are provided on the outer puncture tube 2 , and the outer tube handles 22 are located on both sides of the vacancy 4 .

[0098] By providing the outer tube handle 22 , medical personnel can hold the outer tube handle 22 to bend the outer puncture needle, thereby deforming the outer puncture tube 2 and increasing the width of the gap 4 .

[0099] As a preferred embodiment, based on the above embodiment, further, the bone rod 5 can be bent and deformed.

[0100] Embodiment 5

[0101] This embodiment provides an indwelling needle, including the diameter-adjustable needle as described above.

[0102] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation methods. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the invention are included in the scope of the claims of the present invention.

Claims

1. A diameter adjustable needle, characterized in that: The invention comprises an internal tube and an external puncture tube, wherein the internal tube comprises an internal tube body, the external puncture tube is used to be sleeved on the internal tube body, the internal tube body can move relative to the length direction of the external puncture tube, and the external puncture tube is provided with a vacancy, and the vacancy is arranged along the length direction of the external puncture tube; The outer puncture tube sleeved on the inner tube body is used to constrain the shape of the inner puncture tube body. During the process of the adjustable diameter needle piercing the blood vessel, the outer puncture tube and the inner puncture tube body are inserted into the patient's blood vessel together; By bending the outer puncture tube, the outer puncture tube can be deformed, the width of the gap can be increased, and the inner tube body can be separated from the outer puncture tube through the gap. After the outer puncture tube and the inner tube body are separated, the inner tube body is not constrained by the outer puncture tube, so that the inner tube body expands. The built-in tube body comprises a plurality of bone rods and a thin film, wherein the plurality of bone rods are distributed around the central axis of the built-in tube body, the thin film is arranged between adjacent bone rods, and the thin film and the bone rods form a first channel for liquid circulation; The bone rod is used to support the internal tube body; When the outer puncture tube is sleeved on the inner tube body, the bone rods are retracted to reduce the cross-sectional area of ​​the first channel; When the inner tube body is inserted into the blood vessel and is not sheathed by the outer puncture tube, the bone rods are spread apart to increase the cross-sectional area of ​​the first channel; The bone rod comprises a first bone rod and a second bone rod, a first elastic membrane is arranged between the first bone rod and the second bone rod, the first elastic membrane is elastic, and the first elastic membrane is in an annular structure adapted to the internal tube body, one end of the first elastic membrane is connected to a plurality of the first bone rods, and the other end of the first elastic membrane is connected to a plurality of the second bone rods; When the second bone rod moves relative to the first bone rod along the length direction of the first bone rod, the first elastic membrane is deformed; The built-in tube body further comprises a plurality of support members, the support members are ring-shaped, the support members are elastic, the support members are connected to the plurality of bone rods, and the plurality of support members are distributed along the length direction of the bone rods; When the outer puncture tube is sleeved on the inner tube body, the support member located in the outer puncture tube is squeezed and deformed, so that the bone rods are retracted; When the inner tube body is not sheathed by the outer puncture tube, the support member recovers its deformation, so that the bone rod changes from a gathered state to an unfolded state; The internal tube further comprises a booster handle, which comprises a booster handle body and a handle, and medical personnel can hold the handle to push the booster handle body to move, so that the booster handle body drives the internal tube to move; The distance between the first bone rod and the booster handle is smaller than the distance between the second bone rod and the booster handle; A plurality of the first bone rods and the film form a first section of the internal tube, and a plurality of the second bone rods and the film form a second section of the internal tube; An overlapping area is provided between the first section of the built-in tube and the second section of the built-in tube, and in the overlapping area, the first section of the built-in tube is sleeved on the outside of the second section of the built-in tube; The first bone rod is provided with a slope, and the slope is adapted to the second bone rod; When the second bone rod moves relative to the first bone rod and moves toward the direction close to the booster handle, the slope causes the ends of the plurality of second bone rods close to the first bone rod to gradually converge and form a blocking area, which is a gap formed by the first and second sections of the built-in tube and the first elastic membrane; The larger the distance that the second bone rod moves toward the direction approaching the boosting handle, the larger the blocking area formed.

2. The diameter-adjustable needle according to claim 1, characterized in that: At least one of the supporting members is connected between a plurality of the first bone bars; At least one of the supporting members is connected between a plurality of the second bone rods.

3. The diameter-adjustable needle according to claim 1, characterized in that: The built-in tube also includes a leak-proof top, which is a conical structure. The leak-proof top connects the built-in tube body and the booster handle body. The leak-proof top is used to prevent liquid from leaking out of the puncture port when the built-in tube is inserted into the blood vessel.

4. The diameter-adjustable needle according to claim 3, characterized in that: The built-in tube also includes a connection port, which is connected to the booster handle body and is used to connect an infusion set or a three-way tube.

5. An indwelling needle, characterized in that: The invention comprises the diameter-adjustable needle as described in any one of claims 1 to 4.

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