A drug delivery device

Abstract

This invention relates to the field of medical device technology, specifically to a drug delivery device, comprising a telescopic needle and a soft needle assembly. The soft needle assembly includes a soft needle tube, a fixing ring, and a drug delivery tube. One end of the soft needle tube is threaded, and the other end is beveled, with the inner diameter at the middle position of the soft needle tube being larger than the inner diameter at the end position. The fixing ring and the drug delivery tube are both connected to the outside of the soft needle tube wall. The drug delivery tube is connected between the fixing ring and the thread, and communicates with the soft needle tube. The fixing ring is close to the drug delivery tube. The telescopic needle includes a core needle and a threaded push-pull cap. One end of the core needle is a pointed tip, and the other end passes through the soft needle tube and connects to the push-pull cap. The push-pull cap is threadedly connected to the soft needle tube. The diameter of the core needle is larger than the inner diameter at both ends of the soft needle tube. This invention has a simple structure, is easy to insert into blood vessels, and is less prone to reflux and needle bending, enabling direct drug delivery to tumors in distal parts of the human body.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically to a drug delivery device. Background Technology

[0002] Arterial intubation chemotherapy is one of the most important methods used in clinical medicine for the treatment of malignant tumors.

[0003] Chinese patent CN2610936Y discloses an easy-to-insert, anti-slip, and anti-reflux drug delivery catheter. The catheter is characterized by: using a medical elastic catheter, with a reinforced distal end embedded using a special process to form a tapered tip, and sequentially equipped with a fixing ring valve and a positioning retainer. The reinforced tapered tip, fixing ring valve, and retainer conveniently achieve easy insertion, anti-reflux, and anti-slip functions. This catheter can be connected to an injection seat or a medication cartridge for single-use external drug delivery or implantable multiple-use drug delivery. It particularly addresses the need for multiple drug delivery via short, fragile, and small arteries in tumor treatment. However, the existing technology still has the following unresolved problems: 1. The tip of the locally reinforced tapered tip remains inside the artery after insertion, posing a risk of needle deflection, which is very high for arteries; 2. To increase the rigidity of the tapered tip for easier insertion, a rigid body is used to reinforce the middle of the tapered tip, and an appropriate length of slit is opened along the longitudinal direction of the catheter wall adjacent to the tapered tip, parallel to the catheter axis, to form a fixing ring valve. Obviously, opening the fixed ring valve in the tube wall will destroy the rigidity of the catheter, making the catheter tip more prone to deformation and bending at the crack when subjected to pressure. This will not only reduce the force required to insert the conical tip into the blood vessel and increase the difficulty of insertion, but also make the conical tip prone to deformation at a certain angle range, especially at the fixed ring valve, during insertion, leading to valve failure; 3. When the anti-reflux drug delivery catheter provided by the above patent is applied to the active parts of the human body, the deformation of the fixed ring valve under force will cause reflux, and safety urgently needs to be addressed. Summary of the Invention

[0004] The present invention aims to provide a drug delivery device that is simple in structure, has good applicability, is easy to insert into blood vessels, and is not prone to reflux or needle bending.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a drug delivery device, comprising a telescopic needle and a flexible needle component. The flexible needle component includes a flexible needle tube, a fixing ring, and a drug delivery tube. One end of the flexible needle tube is threaded, and the other end is beveled. The inner diameter of the flexible needle tube at its middle position is larger than the inner diameter at its end position. The fixing ring and the drug delivery tube are both connected to the outside of the tube wall of the flexible needle tube. The drug delivery tube is connected between the fixing ring and the thread, and communicates with the flexible needle tube. The fixing ring is located close to the drug delivery tube.

[0007] The telescopic needle includes a core needle and a threaded push-pull cap; the diameter of the core needle is larger than the inner diameter of both ends of the soft needle tube, and one end of the core needle is a pointed tip, while the other end passes through the soft needle tube and connects to the push-pull cap.

[0008] The push-pull cap and the soft needle tube are connected by threads.

[0009] Preferably, the push-pull cap includes an inner cavity and a connecting hole communicating with the inner cavity, the connecting hole being located at one end of the push-pull cap; the inner diameter of the inner cavity is larger than the inner diameter of the connecting hole, and the portion of the inner cavity wall away from the connecting hole is provided with threads; the length of the threads on the inner cavity wall plus the thread length at the end of the soft needle tube is less than the length of the inner cavity.

[0010] Preferably, the angle between the administration tube and the soft needle tube is not a right angle.

[0011] Preferably, the thread at the end of the soft needle tube is an external thread.

[0012] Preferably, the wall thickness of the threaded end of the soft needle tube is greater than that of the beveled end.

[0013] Preferably, the core needle is made of fine steel wire.

[0014] Preferably, the drug delivery device further includes an end cap connected to the open end of the drug delivery tube.

[0015] Preferably, the administration tube further includes a check valve connected to the open end of the administration tube and located below the end cap.

[0016] Preferably, the check valve is a duckbill-shaped check valve.

[0017] Due to the adoption of the above technical solutions, the advantages of this invention are as follows:

[0018] 1. The telescopic needle provided by the present invention has only a core needle and a soft needle tube in its insertion part, which makes it easy to manufacture into a fine needle diameter, suitable for insertion into larger blood vessels and small and short arteries, and has good applicability;

[0019] 2. The drug delivery device provided by the present invention does not suffer from deformation or malfunction during use of the duckbill-shaped, fixed annular check valve, which could lead to difficulty in inserting into blood vessels or reflux.

[0020] 3. The drug delivery device provided by the present invention has multiple features to prevent backflow during use, such as setting the inner diameter of the soft needle tube to be smaller than the diameter of the core needle, and the wall thickness of the soft needle tube with the threaded end to be thicker than the wall with the beveled end. In addition, a check valve and an end cap are provided on the drug delivery tube.

[0021] 4. The presence of a micro-gap between the middle part of the soft needle tube and the core needle in the present invention not only facilitates the implantation of the core needle into the soft needle tube, but also helps to reduce the resistance and drug delivery pressure of the core needle extending and contracting within the soft needle tube. This facilitates the manufacture of a suitable longer implantation segment, and the drug delivery device with a longer implantation segment can achieve drug delivery to distal tumors in the human body.

[0022] 5. After the drug delivery device provided by the present invention is inserted into an artery, the tip of the core needle can be moved into the soft needle tube by twisting the push-pull cap, which avoids the needle bending when the patient changes position, making it safer and more reliable to use;

[0023] 6. The drug delivery device provided by the present invention does not contain a long tube section, and when inserting the needle, it can be manipulated by holding the drug delivery tube and the soft needle tube containing the core needle, making it easy to insert into the blood vessel; the fixed ring facilitates the fixation of the drug delivery device; in addition, the drug can be directly pushed by the drug delivery tube, making it convenient to use;

[0024] 7. Since the length of the thread on the inner wall plus the length of the thread at the end of the soft needle tube is less than the length of the inner cavity, the core needle will not be pulled out too far when the push-pull cap is screwed on, thus avoiding the core needle end from retracting to the micro-gap area and causing backflow.

[0025] 8. The drug delivery device provided by the present invention may only include a telescopic needle and a soft needle component, which has a simple structure and low cost. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a front view schematic diagram of the overall structure of the drug delivery device provided in an embodiment of the present invention;

[0028] Figure 2 for Figure 1 Axial sectional view;

[0029] Figure 3 for Figure 1 A schematic axial cross-sectional view of the drug delivery device when the core needle is in the retracted state.

[0030] Figure 4 This is an axial cross-sectional view of the telescopic needle provided in an embodiment of the present invention.

[0031] In the diagram: 1. Telescopic needle; 11. Core needle; 111. Tip; 12. Push-pull cap; 121. Inner cavity; 122. Connecting hole; 2. Soft needle component; 21. Soft needle tube; 211. Bevel; 212. Fixing ring; 213. Micro-gap; 22. Drug delivery tube; 3. Duckbill-shaped check valve; 4. End cap; 5. Thread. Detailed Implementation

[0032] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," "outer," "left," "right," "front," and "rear" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0033] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0034] The specific implementation method is described below:

[0035] An embodiment of a drug delivery device provided by the present invention is shown below. Figure 1 , Figure 2 , Figure 3 , Figure 4 The device includes an end cap (4), a duckbill-shaped check valve (3), a telescopic needle (1), and a soft needle (2), wherein the end cap (4) is connected to the open end of the administration tube (22);

[0036] The duckbill-shaped check valve (3) is connected to the open end of the administration tube (22) and is located below the end cap (4);

[0037] The soft needle component (2) includes a soft needle tube (21), a fixing ring (212), and a drug delivery tube (22). One end of the soft needle tube (21) is provided with a thread (5), and the other end is provided with a bevel (211). The inner diameter of the soft needle tube (21) at the middle position is larger than the inner diameter at the end position. The fixing ring (212) and the drug delivery tube (22) are both connected to the outside of the tube wall of the soft needle tube (21). The drug delivery tube (22) is connected between the fixing ring (212) and the thread (5), and the drug delivery tube (22) communicates with the soft needle tube (21). The fixing ring (212) is close to the drug delivery tube (22). The wall thickness of the soft needle tube (21) at the end with the thread (5) is greater than the wall thickness at the end with the bevel (211).

[0038] The telescopic needle (1) includes a core needle (11) and a push-pull cap (12). The push-pull cap (12) includes an inner cavity (121) and a connecting hole (122) communicating with the inner cavity (121). The connecting hole (122) is located at one end of the push-pull cap (12). The inner diameter of the inner cavity (121) is larger than the inner diameter of the connecting hole (122), and the portion of the inner cavity (121) wall away from the connecting hole (122) is provided with a thread (5). The length of the thread (5) on the inner cavity (121) wall plus the length of the thread (5) at the end of the soft needle tube (21) is less than the length of the inner cavity (121). The diameter of the core needle (11) is larger than the inner diameter of both ends of the soft needle tube (21). One end of the core needle (11) is a pointed tip (111), and the other end passes through the soft needle tube (21) and is fixedly connected to the push-pull cap (12).

[0039] The push-pull cap (12) and the soft needle tube (21) are connected by a thread (5).

[0040] When using this invention, see [link / reference]. Figure 1 , Figure 2 Holding the connection between the administration tube (22) and the soft needle tube (21), puncture the patient's artery. Insert the core needle (11) and the soft needle tube (21) with the beveled end (211) into the blood vessel at the tumor site. Then, while holding the connection between the administration tube (22) and the soft needle tube (21) with one hand, twist the push-pull cap (12) with the other hand to pull the tip of the core needle (11) into the soft needle tube (21). See [link to relevant documentation]. Figure 3 Finally, fix the connection between the administration tube (22) and the soft needle tube (21) with sutures or other means, or fix the position of the fixing ring (212) to prevent the administration device from slipping off.

[0041] When medication needs to be delivered, open the end cap (4) and connect the delivery tube (22) of this invention to a syringe or a medicine bottle with a delivery pump for administration. The medication enters the duckbill-shaped check valve (3), then pushes up the soft needle tube (21) at the bevel (211) end, and flows into the blood vessel through the gap between the soft needle tube (21) and the core needle (11), thereby administering medication to the patient.

[0042] The above embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the implementation of the present invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is impossible to exhaustively list all possible implementations here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A drug delivery device, comprising a telescopic needle (1) and a flexible needle component (2), characterized in that: The soft needle component (2) includes a soft needle tube (21), a fixing ring (212), and a drug delivery tube (22). One end of the soft needle tube (21) is provided with a thread (5), and the other end is provided with a bevel (211). The inner diameter of the soft needle tube (21) at the middle position is larger than the inner diameter at the end position. The fixing ring (212) and the drug delivery tube (22) are both connected to the outside of the tube wall of the soft needle tube (21). The drug delivery tube (22) is connected between the fixing ring (212) and the thread (5), and the drug delivery tube (22) communicates with the soft needle tube (21). The fixing ring (212) is close to the drug delivery tube (22). The telescopic needle (1) includes a core needle (11) and a push-pull cap (12) with threads (5); the diameter of the core needle (11) is larger than the inner diameter of both ends of the soft needle tube (21), and one end of the core needle (11) is a pointed tip (111), and the other end passes through the soft needle tube (21) and is connected to the push-pull cap (12); The push-pull cap (12) and the soft needle tube (21) are connected by a thread (5).

2. The drug delivery device as claimed in claim 1, characterized in that: The thread (5) at the end of the soft needle tube (21) is an external thread.

3. The drug delivery device as described in claim 1, characterized in that: The push-pull cap (12) includes an inner cavity (121) and a connecting hole (122) communicating with the inner cavity (121). The connecting hole (122) is located at one end of the push-pull cap (12). The inner diameter of the inner cavity (121) is larger than the inner diameter of the connecting hole (122), and the portion of the inner cavity (121) wall away from the connecting hole (122) is provided with a thread (5). The length of the thread (5) on the inner cavity (121) wall plus the length of the thread (5) at the end of the soft needle tube (21) is less than the length of the inner cavity (121).

4. The drug delivery device as claimed in claim 1, characterized in that: The wall thickness of the soft needle tube (21) with the threaded (5) end is greater than the wall thickness of the end with the bevel (211).

5. The drug delivery device as claimed in claim 1, characterized in that: The angle between the administration tube (22) and the soft needle tube (21) is not a right angle.

6. The drug delivery device as claimed in claim 1, characterized in that: The core needle (11) is made of fine steel wire.

7. The drug delivery device according to any one of claims 1 to 6, characterized in that: The drug delivery device also includes an end cap (4), which is connected to the open end of the drug delivery tube (22).

8. The drug delivery device as claimed in claim 7, characterized in that: The administration tube (22) includes a check valve connected to the open end of the administration tube (22) and located below the end cap (4).

9. The drug delivery device as claimed in claim 8, characterized in that: The check valve is a duckbill-shaped check valve (3).

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