Endoscopic intravenous injection needle

Abstract

An endoscopic intravenous injection needle, relating to the technical field of medical devices. The injection needle comprises a hollow first tube (1), a second tube (2), and a puncture needle (3), and further comprise a control handle (4). The first tube (1) is sleeved outside the second tube (2); one end of the second tube (2) is connected to the puncture needle (3); a hollow third tube (5) is further provided between the second tube (2) and the first tube (1); the third tube (5) has one end connected to the control handle (4) and the other end provided with a flexible transparent injection hose (6); the injection hose (6) covers the puncture needle (3); and the injection hose (6) is in sliding fit with the puncture needle (3). The endoscopic intravenous injection needle can greatly improve the accuracy of an injection process, and can significantly reduce the risk of massive intraoperative hemorrhage caused by needle dislodgement and excessively deep penetration of the puncture needle (3) during operation and the risks of significant waste of medical expenses and a late complication of ulcer bleeding caused by improperly placed injections, thereby improving the effectiveness, safety, and economy.

Description

Endoscopic intravenous injection needle Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an endoscopic intravenous injection needle. Background Art

[0002] For the treatment and prevention of ruptured gastric variceal bleeding, in addition to drug therapy, endoscopic injection of sclerosant or tissue adhesive to treat esophageal-gastric varices is an effective minimally invasive and first-line treatment method that is widely used to prevent and treat gastrointestinal bleeding in patients with portal hypertension, greatly improving the quality of life and survival time of patients.

[0003] Compared with traditional conservative medical treatment, endoscopic varicose vein treatment offers significant cost-effectiveness in reducing rebleeding and mortality, eliminating varicose veins, and minimizing recurrence. Endoscopic treatment, due to its effectiveness, minimal invasiveness, and high cost-effectiveness, is globally recognized as the first-line treatment and gold standard for this disease. Among these endoscopic treatments, a key approach is endoscopic tissue glue injection for gastric varices and sclerotherapy for esophageal varices. These injections inevitably involve the use of an endoscopic intravenous needle.

[0004] The endoscopic varicose vein sclerosant and tissue glue injection needle currently in widespread use generally comprises an outer sheath, within which is arranged an extendable and retractable puncture needle, the front end of which is sharp and the length of which is generally about 5 mm. During the entry of the sheath and in the non-puncture state, the puncture needle is retracted within the sheath. When the front end of the sheath enters and reaches the vicinity of the injection position, the puncture needle is extended out of the sheath by controlling the handle at the outer end of the sheath to puncture the target vein. After the puncture is successful, the drug, such as a sclerosant or tissue glue, is injected by operating the handle.

[0005] Although the endoscopic intravenous needle with the above structure has been widely used, the inventors found that it still has some shortcomings in further clinical practice and research. Specifically, on the one hand, it is difficult to grasp the timing of puncture. On the other hand, and most importantly, after a successful puncture, the injection process takes a long time, and the shaking of the vein makes it very difficult to accurately complete the intravenous injection. The inventors further studied it as follows:

[0006] On the one hand, during the operation, the target vein often fluctuates and shakes with the patient's breathing, heartbeat, nausea and vomiting, coughing, gastroesophageal motility, etc., and is unpredictable. In particular, nausea, vomiting and coughing are significantly irregular and unpredictable, causing the target vein to move, thereby causing movement and uncertainty in the position of the needle tip after puncture, leading to the risk of puncturing the vein too deeply or puncturing too shallowly, with the adverse consequences being: massive bleeding during the operation, a significant waste of medical expenses, postoperative bleeding from gelatin ulcers and damage to the endoscope, and increased medical expenses for patients and maintenance costs for the department. On the other hand, in order to reduce the risk of needle dislodgment when the current intravenous needle is inserted into the vein and during the injection process, the doctor needs to ensure the length of the puncture needle entering the vein as much as possible. However, although this reduces the risk of needle dislodgment, the increase in the force and length of the puncture needle entry, although it ensures the entry length of the puncture needle, also further increases the risk of the puncture being too deep, causing the puncture needle to injure the opposite side of the vein or even puncture the vein. In severe cases, even a larger diameter sheath may be inserted into the vein, causing a greater risk of bleeding and leading to serious medical accidents.

[0007] Therefore, there is an urgent need for an endoscopic intravenous needle that can reduce the risk of needle removal and the risk of excessive puncture. Summary of the Invention

[0008] The purpose of the present invention is to provide an endoscopic intravenous injection needle that can reduce the risk of needle dislodgment and the risk of over-deep puncture, in response to the problems of easy needle dislodgment and over-deep puncture of current endoscopic intravenous injection needles.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] An endoscopic intravenous needle,

[0011] The device comprises a hollow first tube body, a second tube body and a puncture needle, and also includes a control handle. The first tube body is sleeved on the second tube body, one end of the second tube body is connected to the puncture needle, and the other end is connected to the control handle. The control handle is also provided with a drug injection port that cooperates with a syringe, and the drug injection port is connected to the internal channel of the second tube body.

[0012] The second tube body is slidably disposed in the first tube body, and the control handle controls the puncture needle to extend out of the first tube body and / or retract into the first tube body through the second tube body.

[0013] A third tube body is also provided between the second tube body and the first tube body, and the third tube body is slidably matched with the first tube body and the second tube body. One end of the third tube body is connected to the control handle, and the other end is provided with a flexible injection hose, and the injection hose is covered outside the puncture needle. The injection hose and the puncture needle are slidably matched, so that when the puncture needle extends out of the first tube body, the control handle can push the injection hose out through the third tube body and make the injection hose exceed the puncture needle.

[0014] As a preferred technical solution, the maximum length that the puncture needle can extend out of the first tube is less than or equal to 4 mm.

[0015] As a preferred technical solution, the length of the injection hose is 5-15 mm.

[0016] As a further preferred technical solution, the length of the injection hose is 10-15 mm.

[0017] As a preferred technical solution, the injection hose is made of transparent material.

[0018] As another preferred technical solution, the maximum length by which the injection hose can extend out of the first tube body is greater than or equal to 10 mm.

[0019] As a preferred technical solution, a first step is formed between the injection hose and the third tube body, and a second step is formed between the second tube body and the puncture needle.

[0020] The first step cooperates with the second step so that when the second tube pushes the puncture needle in and out of the first tube, the second step can push the first step toward the outside of the first tube, so that the injection hose and the puncture needle extend out of the first tube synchronously.

[0021] As a preferred technical solution, when the first step contacts the second step, the tip of the puncture needle extends beyond the injection hose, ensuring that the puncture needle can puncture the vein smoothly.

[0022] As a preferred technical solution, the control handle includes a grip, a puncture needle control handle and an injection hose control handle.

[0023] The first tube is connected to the grip, the second tube extends into the control handle and is connected to the puncture needle control handle, the puncture needle control handle and the grip are in damping cooperation, and the damping value between the puncture needle control handle and the grip ensures that when the third tube moves, the second tube does not move due to the friction between the second tube and the third tube;

[0024] The injection hose control handle is connected to the third tube body, and the injection hose control handle and the handle are damped. The damping value between the injection hose control handle and the handle ensures that when the second tube body moves, the third tube body does not move due to the friction between the second tube body and the third tube body.

[0025] As a preferred technical solution, there are also a first protrusion and a second protrusion on the handle corresponding to the stroke of the injection hose control handle. The first protrusion and the second protrusion are made of elastic material, so that the injection hose control handle can squeeze and pass over the first protrusion and the second protrusion. The distance between the first protrusion and the second protrusion is 5mm. When the injection hose control handle is located at the first protrusion, the length of the injection hose extending out of the first tube body is 5mm. When the injection hose control handle is located at the second protrusion, the length of the injection hose extending out of the first tube body is 10mm.

[0026] As a preferred technical solution, the drug injection port is provided on the puncture needle control handle.

[0027] As a preferred technical solution, the side wall of the puncture needle is further provided with at least one through hole, so that when the puncture needle punctures, the blood return of the vein at the puncture site can be observed through an endoscope.

[0028] As a preferred technical solution, a size scale is also provided on the injection hose so that when the injection hose enters the vein, the length of the injection hose entering the vein can be observed under an endoscope.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The endoscopic intravenous injection needle of the present application, when in use, during the process of the endoscopic intravenous injection needle entering the human body, the puncture needle and the second tube body are retracted into the first tube body to prevent the puncture needle from piercing human tissue. When the front end of the injection needle moves to a position near the target puncture vein, the puncture needle is pushed out of the first tube body by controlling the handle to perform puncture.

[0031] After the puncture is successful, the third tube body is pushed by the injection hose control handle so that the front end of the injection hose exceeds the puncture needle. Then, the puncture needle control handle is used to retract the puncture needle. At this time, the injection hose is located in the vein, and the syringe is operated to inject the medicine. After the injection is completed, the injection hose is retracted into the first tube body by the control handle, that is, the injection work is completed;

[0032] In the solution of the present application, due to the provision of the injection hose, the flexible injection hose is placed in the vein during drug injection, which firstly reduces the risk of the vein being scratched or even punctured by the puncture needle during the injection process, directly eliminates the risk of medical accidents caused by the first tube being inserted into the vein, and greatly reduces complications and adverse events such as heavy bleeding and drug waste caused by extravenous injection, as well as endoscopic damage.

[0033] Furthermore, using the endoscopic intravenous injection needle of the present application, in certain special cases, such as when the puncture target is in a small area of ​​the vein, the puncture needle can be directly retracted after a successful puncture, leaving only the injection hose in the vein for injection treatment. This can provide the surgeon with more treatment options, further provide the patient with appropriate treatment methods, and reduce surgical risks.

[0034] In particular, in the traditional intravenous needle structure, in order to prevent the problem of needle falling off during the injection process, it is necessary to ensure that the puncture needle enters the vein for a certain length to ensure the stability of the puncture needle after insertion. From this aspect, the longer the puncture needle enters the vein, the more stable it is. However, if the puncture needle enters too long, there is a risk of puncturing or even puncturing the vein. Therefore, in the current puncture needle design process, taking these two aspects into consideration, the puncture needle length usually used is about 5 mm. In the solution of the present application, due to the provision of the injection hose, the risk of falling off during the injection process is controlled by the injection hose. The texture of the injection hose is softer than the puncture needle, and the tip does not need to consider puncturing the vein wall, so the tip can also be smoother, thereby directly avoiding the risk of the injection hose causing scratches to the vein or other tissues. The puncture needle only plays the role of puncturing the vein, so the length of the puncture needle can be further reduced, thereby further reducing the risk during puncture; and the injection hose can be longer than the puncture needle, thereby achieving a better stability effect and greatly reducing the risk of needle falling off;

[0035] In one embodiment of the present application, the first position and the second position are constrained on the injection hose control handle by setting an elastic protrusion on the stroke of the injection hose control handle. When the injection hose control handle touches the elastic protrusion, the elastic protrusion is compressed and deformed, thereby increasing the propulsion damping at the injection hose control handle, so that the operating doctor can get the position feedback of the injection hose by feel. The elastic protrusion can, for example, be set in the form of a first protrusion and a second protrusion. The first protrusion and the second protrusion are made of elastic material, so that the injection hose control handle can squeeze and pass over the first protrusion and the second protrusion. The distance between the first protrusion and the second protrusion is 5 mm. When the injection hose control handle is located at the first protrusion, the length of the injection hose extending out of the first tube body is 5 mm. When the injection hose control handle is located at the second protrusion, the length of the injection hose extending out of the first tube body is 10 mm. The first protrusion and the second protrusion are both made of elastic material, and the height of the first protrusion and the second protrusion ensure that the injection hose control handle can pass over and continue to move after being squeezed and deformed. In this way, the surgeon or the assistant can feel in the hand when the injection hose control handle touches the first protrusion or the second protrusion during the process of pushing the injection hose control handle, and then infer the extension state and position of the injection hose at this time, which further facilitates control and reduces the medical risks caused by the excessive length of the injection hose. Especially when pushing the puncture needle, the injection hose control handle is also driven to move forward due to the setting of the first step and the second step. Here, when the injection hose control handle touches the first protrusion, the puncture needle control handle can still sense the change in resistance brought by the first protrusion, and then sense the extension position of the puncture needle, which further facilitates the control of the extension length of the puncture needle. Before the injection hose control handle reaches the first position, the injection The depth of the hose entering the vein is relatively shallow. At this time, the resistance between the injection hose control handle and the grip is relatively small, so the injection hose control handle can quickly reach the first position, ensuring that the injection hose enters to a certain depth and ensures a certain stability. Furthermore, when the injection hose control handle passes over the first protrusion, the first protrusion is compressed between the injection hose control handle and the grip. On the one hand, the increase in resistance can bring a different feel to the operating doctor, and then grasp the position of the injection hose. On the other hand, at this time, the injection hose has punctured into the vein to a certain depth. Due to the increase in the propulsion resistance of the injection hose control handle, it can continue to be pushed in slightly more slowly. In this way, when the injection hose enters the vein to a certain depth, it is pushed in with a slightly greater propulsion force, which makes it easier to reduce the propulsion speed, achieve precise operation, and reduce the risk of damage to the vein caused by the rapid insertion of the injection hose insertion end. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG1 is a schematic structural diagram of an endoscopic intravenous injection needle according to one embodiment of the present invention, wherein the puncture needle and the injection hose are located in the first tube body;

[0037] FIG2 is a schematic diagram of a partially enlarged structure of point A in FIG1 ;

[0038] FIG3 is a schematic diagram of a partially enlarged structure of point B in FIG1 ;

[0039] FIG4 is a schematic structural diagram of an embodiment of an endoscopic intravenous injection needle according to the present invention, in which the puncture needle and the injection hose extend out of the first tube body and are in a venous puncture state;

[0040] FIG5 is a schematic diagram of a partially enlarged structure of point C in FIG4 ;

[0041] FIG6 is a schematic structural diagram of an embodiment of an endoscopic intravenous injection needle according to the present invention, in which the puncture needle is retracted into the first tube body and the injection hose is extended out of the first tube body, in an injection state;

[0042] FIG7 is a schematic diagram of a partially enlarged structure of point D in FIG6 ;

[0043] FIG8 is a schematic diagram of the partial structure of the cooperation between the second tube and the puncture needle in one embodiment of the endoscopic intravenous injection needle of the present invention;

[0044] FIG9 is a schematic diagram of a partial structure of the cooperation between the third tube body and the injection hose in one embodiment of the endoscopic intravenous injection needle of the present invention;

[0045] FIG10 is a schematic diagram of the partial structure of one embodiment of the endoscopic intravenous injection needle of the present invention when the first step and the second step are in contact;

[0046] FIG11 is a schematic diagram of a partial structure of an endoscopic intravenous injection needle in one embodiment of the present invention when the first step and the second step are separated.

[0047] In the figure: 1. first tube body; 2. second tube body; 3. puncture needle; 4. control handle; 5. third tube body; 6. injection hose; 7. drug injection port; 8. first step; 9. second step; 10. through hole; 11. grip; 12. puncture needle control handle; 13. injection hose control handle; 14. first protrusion; 15. second protrusion. DETAILED DESCRIPTION

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0049] Example 1

[0050] An endoscopic intravenous injection needle, as shown in Figures 1 to 11, includes a hollow first tubular body 1, a second tubular body 2, and a puncture needle 3, and also includes a control handle 4. The first tubular body 1 is sleeved outside the second tubular body 2, one end of the second tubular body 2 is connected to the puncture needle 3, and the other end is connected to the control handle 4. The control handle 4 is also provided with a drug injection port 7 that cooperates with a syringe, and the drug injection port 7 is connected to the internal channel of the second tubular body 2;

[0051] The second tube body 2 is slidably disposed in the first tube body 1 , and the control handle 4 controls the puncture needle 3 to extend out of the first tube body 1 and / or retract into the first tube body 1 through the second tube body 2 .

[0052] A third tube body 5 is also provided between the second tube body 2 and the first tube body 1. The third tube body 5 is slidably fitted with the first tube body 1 and the second tube body 2. One end of the third tube body 5 is connected to the control handle 4, and the other end is provided with a flexible injection hose 6. The injection hose 6 is wrapped around the outside of the puncture needle 3. The injection hose 6 is slidably fitted with the puncture needle 3, so that when the puncture needle 3 extends out of the first tube body 1, the control handle 4 can push the injection hose 6 out through the third tube body 5 and make the injection hose 6 exceed the puncture needle 3.

[0053] When the endoscopic intravenous injection needle of this embodiment is used, a syringe filled with medicine is connected to the medicine injection port 7. During the process of the endoscopic intravenous injection needle entering the human body, as shown in Figures 1-3, the puncture needle 3 and the second tube body 2 are retracted into the first tube body 1 to prevent the puncture needle 3 from puncturing human tissue. When the front end of the injection needle moves to a position near the target puncture vein, as shown in Figures 4 and 5, the puncture needle 3 is pushed out of the first tube body 1 by the control handle 4 to perform puncture. After the puncture is successful, as shown in Figures 6 and 7, the third tube body 5 is pushed by the control handle 4 so that the front end of the injection hose 6 exceeds the puncture needle 3, and then the puncture needle 3 is retracted. At this time, the injection hose 6 is located in the vein, and the syringe is operated to inject the medicine. After the injection is completed, the injection hose 6 is retracted into the first tube body 1 by the control handle 4, that is, the injection work is completed.

[0054] As a preferred technical solution, the maximum length that the puncture needle 3 can extend out of the first tube 1 is less than or equal to 4 mm.

[0055] As a preferred embodiment, based on the above method, the length of the injection hose 6 is 5-15 mm.

[0056] As a further preferred technical solution, the length of the injection hose 6 is 10-15 mm. In this embodiment, the length of the injection hose 6 is set to 5-15 mm, so that the length of the injection hose 6 entering the vein can further stabilize the intravenous needle structure behind it, greatly improving the stability during the injection process and reducing the risk of needle removal.

[0057] As a preferred embodiment, the injection hose is made of a transparent material, so that when the puncture needle 3 is puncturing, the blood return can be easily observed, thereby facilitating the surgeon's assessment of whether the puncture is successful.

[0058] As another preferred embodiment, the maximum length that the injection hose 6 can extend out of the first tube body 1 is greater than or equal to 10 mm.

[0059] In the solution of this embodiment, due to the provision of the injection hose 6, it is flexible in the vein when the drug is injected, firstly, the risk of the vein being scratched or punctured by the puncture needle 3 during the injection process is reduced;

[0060] In particular, in the traditional intravenous needle structure, in order to prevent the problem of needle falling off during the injection process, it is necessary to ensure that the puncture needle 3 enters the vein for a certain length to ensure the stability of the puncture needle 3 after insertion. From this aspect, the longer the puncture needle 3 enters the vein, the more stable it is. However, if the puncture needle 3 enters too long, there is a risk of puncturing the vein. Therefore, in the current design process of the puncture needle 3, these two aspects are taken into consideration, and the puncture needle 3 is usually about 5 mm long.

[0061] In the scheme of this embodiment, due to the setting of the injection hose 6, the risk of falling off during the injection process is controlled by the injection hose 6. The texture of the injection hose 6 is softer than the puncture needle 3, and the tip does not need to consider puncturing the vein wall, so the tip can also be smoother, thereby directly avoiding the risk of the injection hose 6 causing scratches to the vein or other tissues. The puncture needle 3 only plays a role in puncturing the vein, so the length of the puncture needle 3 can be further reduced, thereby further reducing the risk of puncture; and the injection hose 6 can adopt a longer length than the puncture needle 3, thereby achieving a better stabilization effect and greatly reducing the risk of needle falling off.

[0062] As a preferred embodiment, based on the above method, a first step 8 is formed between the injection hose 6 and the third tube 5, and a second step 9 is formed between the second tube 2 and the puncture needle 3.

[0063] The first step 8 cooperates with the second step 9 so that when the second tube 2 pushes the puncture needle 3 out of the first tube 1, the second step 9 can push the first step 8 toward the outside of the first tube 1, causing the injection hose 6 to be synchronously extended from the first tube 1 along with the puncture needle 3. In this embodiment, the arrangement of the first step 8 and the second step 9 allows the injection hose 6 to be simultaneously extended when the puncture needle 3 is extended from the first tube 1, reducing the pushing stroke of the injection hose 6 during injection, making the pushing of the injection hose 6 easier and more stable to control, and reducing the risk of the puncture needle 3 shaking due to the excessive pushing stroke of the injection hose 6 after successful puncture, which could lead to needle disengagement and vein puncture.

[0064] As a preferred embodiment, based on the above method, when the first step 8 contacts the second step 9, the tip of the puncture needle 3 extends beyond the injection hose 6, ensuring that the puncture needle 3 can puncture the vein smoothly.

[0065] As a preferred embodiment, based on the above method, the control handle 4 includes a grip 11, a puncture needle control handle 12 and an injection hose control handle 13.

[0066] The first tube body 1 is connected to the grip 11, the second tube body 2 extends into the control handle 4 and is connected to the puncture needle control handle 12, and the puncture needle control handle 12 and the grip 11 are in a damping fit. The damping value between the puncture needle control handle 12 and the grip 11 ensures that when the third tube body 5 moves, the second tube body 2 does not move due to the friction between the second tube body 2 and the third tube body 5;

[0067] The injection hose control handle 13 is connected to the third tube body 5, and the injection hose control handle 13 and the handle 11 are damped. The damping value between the injection hose control handle 13 and the handle 11 ensures that when the second tube body 2 moves, the third tube body 5 does not move due to the friction between the second tube body 2 and the third tube body 5.

[0068] As a preferred embodiment, based on the above method, there is further a first position and a second position on the handle 11 corresponding to the stroke of the injection hose control handle 13. When the injection hose control handle 13 is at the first position, the length of the injection hose 6 extending out of the first tube body 1 is 5 mm. When the injection hose control handle 13 is at the second position, the length of the injection hose 6 extending out of the first tube body 1 is 6-10 mm. In this embodiment, the constraints on the injection hose control handle 13 at the first position and the second position can be an elastic snap-on structure, that is, a notch is set on the handle 11 corresponding to the first position and the second position (not shown in the figure), and an elastic clip (not shown in the figure) matching the notch is set on the injection hose control handle 13. When the injection hose control handle 13 moves on the advancement stroke, when it is located at the first position, the elastic clip on the injection hose control handle 13 sinks into the notch under the elastic action, so that the operating doctor can obtain the position feedback of the injection hose 6. When the injection hose control handle 13 is further pushed, the elastic clip on the injection hose control handle 13 disengages from the notch at the first position under the elastic action and moves toward the second position. In this way, it is convenient for the operating doctor to control the position of the injection hose 6.

[0069] In this embodiment, the constraints on the injection hose control handle 13 at the first position and the second position can also be in the form of an elastic protrusion set on the stroke of the injection hose control handle 13. When the injection hose control handle 13 touches the elastic protrusion, the elastic protrusion is compressed and deformed, thereby increasing the propulsion damping at the injection hose control handle 13, so that the operating doctor can get the position feedback of the injection hose 6 by hand feel. In the present method, the elastic protrusion is taken as an example of a first protrusion 14 and a second protrusion 15. As shown in Figure 3, the first protrusion 14 and the second protrusion 15 are made of elastic material, so that the injection hose control handle 13 can squeeze and pass over the first protrusion 14 and the second protrusion 15. The distance between the first protrusion 14 and the second protrusion 15 is 5 mm. When the injection hose control handle 13 is located at the first protrusion 14, the length of the injection hose 6 extending out of the first tube body 1 is 5 mm. When the injection hose control handle 13 is located at the second protrusion 15, the length of the injection hose 6 extending out of the first tube body 1 is 10 mm.The first protrusion 14 and the second protrusion 15 of this embodiment are both made of elastic material. The height of the first protrusion 14 and the second protrusion 15 ensures that the injection hose control handle 13 can pass over and continue to move after being squeezed and deformed. In this way, the surgeon or the assistant can feel in the hand when the injection hose control handle 13 touches the first protrusion 14 or the second protrusion 15 during the process of pushing the injection hose control handle 13, and then infer the extended state and position of the injection hose 6 at this time, which further facilitates control and reduces the medical risk caused by the excessive length of the injection hose; especially when pushing the puncture needle 3, due to the setting of the first step 8 and the second step 9, the injection hose control handle 13 is also driven to move forward. Here, when the injection hose control handle 13 touches the first protrusion 14, the puncture needle control handle 12 can still sense the change in resistance brought by the first protrusion 14, and then sense the extended position of the puncture needle 3, which further facilitates the control of the extended length of the puncture needle 3. In particular, when the injection hose control handle 13 reaches the first protrusion Before starting 14, since the depth of the injection hose 6 entering the vein is relatively shallow at this time, the resistance between the injection hose control handle 13 and the grip 11 is relatively small, so the injection hose control handle 13 can quickly reach the first protrusion 14, ensuring that the injection hose 6 enters to a certain depth and ensures a certain stability. Furthermore, when the injection hose control handle 13 passes over the first protrusion 14, the first protrusion 14 is compressed between the injection hose control handle 13 and the grip 11. On the one hand, the increase in resistance can bring a different hand feeling to the operating doctor, and thus grasp the position of the injection hose 6. On the other hand, at this time, the injection hose 6 has punctured into the vein to a certain depth. Due to the increase in the pushing resistance of the injection hose control handle 13, it can continue to be pushed in slightly more slowly. In this way, when the injection hose 6 enters the vein to a certain depth, it is pushed in with a slightly greater pushing force, which makes it easier to reduce the pushing speed, achieve precise operation, and reduce the risk of damage to the vein caused by the rapid insertion of the insertion end of the injection hose 6. In the embodiment of the present application, if the puncture fails, the injection hose control handle 13 can be pulled back to drive the entire puncture needle 3 to retreat, find a suitable site again, and repeat the injection process.

[0070] As a preferred embodiment, based on the above embodiment, the drug injection port 7 is further provided on the puncture needle control handle 12 .

[0071] As a preferred embodiment, based on the above-mentioned method, the side wall of the puncture needle 3 is further provided with at least one through hole 10, so that when the puncture needle 3 punctures, the blood return of the vein at the puncture site can be observed through an endoscope.

[0072] As a preferred embodiment, based on the above method, a size scale is further provided on the injection hose 6 so that when the injection hose 6 enters the vein, the length of the injection hose 6 entering the vein can be observed under an endoscope.

[0073] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0074] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An endoscopic intravenous injection needle, comprising a hollow first tube body, a second tube body and a puncture needle, and also comprising a control handle, wherein the first tube body is sleeved outside the second tube body, one end of the second tube body is connected to the puncture needle, and the other end is connected to the control handle, and a drug injection port for matching with a syringe is also arranged at the control handle, and the drug injection port is connected to an internal channel of the second tube body; The second tube body is slidably disposed in the first tube body, and the control handle controls the puncture needle to extend out of the first tube body and / or retract into the first tube body through the second tube body. Features: A hollow third tube body is also arranged between the second tube body and the first tube body, and the third tube body is slidably matched with the first tube body and the second tube body. One end of the third tube body is connected to the control handle, and the other end is provided with a flexible injection hose, and the injection hose is covered outside the puncture needle. The injection hose and the puncture needle are slidably matched, so that when the puncture needle extends out of the first tube body, the control handle can push the injection hose out through the third tube body and make the injection hose exceed the puncture needle.

2. An endoscopic intravenous injection needle according to claim 1, characterized in that: The maximum length that the puncture needle can extend out of the first tube is less than or equal to 4 mm.

3. The endoscopic intravenous injection needle according to claim 1, characterized in that: The length of the injection hose is 5-15 mm.

4. The endoscopic intravenous injection needle according to claim 1, characterized in that: The injection hose is made of transparent material.

5. An endoscopic intravenous injection needle according to any one of claims 1 to 4, characterized in that: The maximum length that the injection hose can extend out of the first tube body is greater than or equal to 10 mm.

6. An endoscopic intravenous injection needle according to any one of claims 1 to 4, characterized in that: A first step is formed between the injection hose and the third tube body, and a second step is formed between the second tube body and the puncture needle. The first step cooperates with the second step so that when the second tube pushes the puncture needle out of the first tube, the second step can push the first step to move toward the outside of the first tube, so that the injection hose and the puncture needle are synchronously extended out of the first tube.

7. An endoscopic intravenous injection needle according to claim 6, characterized in that: When the first step contacts the second step, the tip of the puncture needle extends beyond the injection hose, ensuring that the puncture needle can puncture the vein smoothly.

8. An endoscopic intravenous injection needle according to claim 7, characterized in that: The control handle includes a grip, a puncture needle control handle and an injection hose control handle. The first tube body is connected to the grip, the second tube body extends into the control handle and is connected to the puncture needle control handle, the puncture needle control handle and the grip are in damping cooperation, and the damping value between the puncture needle control handle and the grip ensures that when the third tube body moves, the second tube body does not move due to the friction between the second tube body and the third tube body; The injection hose control handle is connected to the third tube body, and there is a damping fit between the injection hose control handle and the handle. The damping value between the injection hose control handle and the handle ensures that when the second tube body moves, the third tube body does not move due to the friction between the second tube body and the third tube body.

9. An endoscopic intravenous injection needle according to claim 8, characterized in that: There are also a first protrusion and a second protrusion on the handle corresponding to the stroke of the injection hose control handle. The first protrusion and the second protrusion are made of elastic material, so that the injection hose control handle can squeeze and pass over the first protrusion and the second protrusion. The distance between the first protrusion and the second protrusion is 5mm. When the injection hose control handle is located at the first protrusion, the length of the injection hose extending out of the first tube body is 5mm. When the injection hose control handle is located at the second protrusion, the length of the injection hose extending out of the first tube body is 10mm.

10. An endoscopic intravenous injection needle according to claim 9, characterized in that: The medicine injection port is arranged on the puncture needle control handle.

11. An endoscopic intravenous injection needle according to claim 10, characterized in that: The side wall of the puncture needle is also provided with at least one through hole, so that when the puncture needle punctures, the blood return of the vein at the puncture site can be observed through an endoscope.

12. An endoscopic intravenous injection needle according to any one of claims 1 to 4, characterized in that: The injection hose is also provided with a size scale so that when the injection hose enters the vein, the length of the injection hose entering the vein can be observed under an endoscope.

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