Adjusting type injection device

Abstract

According to the adjustable injection device provided by the utility model, when the needle head of the first penetrating tube of the adjustable injection device loses the effect of penetrating tissues, an operator pushes out the second penetrating tube arranged in the first penetrating tube along the axial direction of the first penetrating tube, so that the needle head of the second penetrating tube penetrating through the first penetrating tube continuously extends outwards; according to the adjustable injection device, the secondary penetrable depth of the adjustable injection device is increased, the adjustable injection device can penetrate through a thick tissue place and a deep blood vessel place, puncture operation can be continuously completed after the second needle head is pushed out and it is confirmed that the second needle head is fixed relative to the first needle head and is not loosened, and the applicable range of the adjustable injection device is widened; and repeated consumption of medical consumables such as puncture sleeves and the like and consumable cost paid by patients are reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an adjustable injection device. Background Technology

[0002] When performing lidocaine infiltration anesthesia or puncture using the Seldinger technique (percutaneous puncture), the appropriate needle may encounter special circumstances such as significant variations in patient body size, soft tissue thickness, or vessel location and depth. Furthermore, repeated punctures may cause the needle to lose sharpness and become unable to penetrate the vessel wall, especially in elderly patients where the distribution, elasticity, and thickness of connective tissue in the vessel wall differ significantly from those in younger individuals, frequently leading to difficulties in penetration and causing inconvenience to routine surgical procedures.

[0003] Therefore, there is a lack of an injection device in the existing technology that can change the puncture depth. Utility Model Content

[0004] One of the technical problems that this invention aims to solve is the current limitation that the depth of needles cannot be adjusted during complex puncture procedures.

[0005] To solve the above-mentioned technical problems, this utility model provides an adjustable injection device.

[0006] An adjustable injection device includes a first needle and a second needle. The first needle includes a first penetrating tube and a first head, and the second needle includes a second penetrating tube and a second head. The first penetrating tube is fixedly connected to the first head, and the second penetrating tube is fixedly connected to the second head. The second penetrating tube is axially movably nested inside the first penetrating tube, and the length of the second penetrating tube is greater than the length of the first penetrating tube.

[0007] The adjustable injection device is configured such that when the second head moves into the interior of the first head and is fixed relative to the first head in the length direction of the first penetrating tube, the second penetrating tube is at least partially disposed outside the first penetrating tube.

[0008] In some embodiments, a second latching portion is provided on the outer side of the second head, and a first latching portion is provided on the inner side of the first head, and the first latching portion and the second latching portion are latched together.

[0009] In some embodiments, the second snap-fit ​​portion is an annular protrusion, and the first snap-fit ​​portion is an annular groove, wherein the annular protrusion is snapped into the annular groove after rotation.

[0010] In some embodiments, an annular protrusion is disposed at 3 / 4 of the height of the second head, and an annular groove is disposed at 2 / 3 of the height of the first head.

[0011] In some embodiments, the central angle of the annular protrusion and / or the annular groove is greater than 45 degrees and less than 180 degrees.

[0012] In some embodiments, the length of the first penetrating tube is less than the length of the second penetrating tube, and the difference between the lengths of the first penetrating tube and the second penetrating tube is 2-3 cm.

[0013] In some embodiments, the first penetrating tube and / or the second penetrating tube are made of stainless steel.

[0014] In some embodiments, the outer surfaces of the first head and the second head are conical.

[0015] In some embodiments, the penetration openings of the first and second penetrating tubes have bevels.

[0016] Through the above technical solution, when the needle in the first penetrating tube loses its ability to penetrate tissue, the operator can push the second penetrating tube, which is located inside the first penetrating tube, outward along the axis of the first penetrating tube. This allows the second penetrating tube to continue extending outward through the needle in the first penetrating tube, increasing the penetration depth of the adjustable injection device. At the same time, the needle retracted into the second penetrating tube remains sharp, which helps to penetrate thicker tissues and deeper blood vessels. After pushing out the needle in the second penetrating tube and confirming that it is fixed relative to the first needle without loosening, the puncture operation can continue. This improves the applicability of the adjustable injection device and reduces waste of consumables and patient costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a partial structural schematic diagram of the adjustable injection device according to an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. First needle; 11. First head; 111. First locking part; 12. First penetrating tube; 2. Second needle; 21. Second head; 211. Second locking part; 22. Second penetrating tube; 10. Adjustable injection device. Detailed Implementation

[0021] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to exemplarily illustrate the principles of this utility model, but should not be used to limit the scope of this utility model. This utility model can be implemented in many different forms and is not limited to the specific embodiments of the utility model described herein, but includes all technical solutions falling within the scope of the claims.

[0022] These embodiments are provided to make the present invention thorough and complete, and to fully express the scope of the present invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0023] It should be noted that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this utility model 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 utility model. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] Furthermore, the terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well.

[0025] It should also be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0026] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this invention pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0027] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0028] This embodiment provides an adjustable injection device 10, which includes a first needle 1 and a second needle 2. The first needle 1 includes a first penetrating tube 12 and a first head 11, and the second needle 2 includes a second penetrating tube 22 and a second head 21. The first penetrating tube 12 is fixedly connected to the first head 11, and the second penetrating tube 22 is fixedly connected to the second head 21. The second penetrating tube 22 is axially movably nested inside the first penetrating tube 12, and the length of the second penetrating tube 22 is greater than the length of the first penetrating tube 12. The adjustable injection device 10 is configured such that when the second head 21 moves into the first head 11 and is fixed relative to the first head 11 in the length direction of the first penetrating tube 12, the second penetrating tube 22 is at least partially disposed outside the first penetrating tube 12.

[0029] In this adjustable injection device 10, when the needle of the first penetrating tube 12 loses its ability to penetrate tissue, the operator or a tool can push out the second penetrating tube 22, which is located inside the first penetrating tube 12, along the axial direction of the first penetrating tube 12. The first penetrating tube 12 and the second penetrating tube 22 are in a clearance fit, allowing the second penetrating tube 22 to extend outwards past the needle of the first penetrating tube 12. This increases the overall penetration depth of the adjustable injection device 10, allowing it to adjust the depth of skin tissue it can penetrate. It can penetrate thicker tissues and deeper blood vessels. After pushing out the second needle 2 and confirming that it is fixed securely relative to the first needle 1, the puncture operation can continue. This improves the applicability of the adjustable injection device 10, reduces waste of consumables, and lowers patient costs. Furthermore, by precisely controlling the length of the second needle 2 extending relative to the first needle 1, damage to surrounding tissues during puncture can be reduced, thus minimizing complications.

[0030] In some embodiments, a second locking portion 211 is provided on the outer side of the second head 21, and a first locking portion 111 is provided on the inner side of the first head 11. The first locking portion 111 and the second locking portion 211 are locked together, which can ensure that the position of the second penetrating tube 22 is fixed in the first penetrating tube 12, improve the accuracy of puncture, prevent relative sliding or displacement during puncture, and thus improve the stability and safety of puncture.

[0031] In some embodiments, the second locking portion 211 is an annular protrusion, and the first locking portion 111 is an annular groove. The annular protrusion engages with the annular groove after rotation. The engagement of the annular protrusion and the annular groove provides a stable connection, preventing the adjustable injection device 10 from accidentally disengaging during puncture, thereby ensuring the safety and reliability of the procedure. Furthermore, the design of the annular locking portion allows for quick assembly and disassembly. The annular locking portion provides a large-angle engagement, enabling uniform load distribution, thereby reducing local stress concentration and enhancing the durability of the adjustable injection device 10. The design of the annular protrusion and groove reduces resistance during assembly, making the assembly process smoother.

[0032] In some embodiments, the annular protrusion is located at 3 / 4 of the height of the second head 21, and the annular groove is located at 2 / 3 of the height of the first head 11. This allows the locking structure to be located in the upper middle part of the two heads, which makes it more mechanically stable and facilitates medical personnel to quickly and accurately lock the annular protrusion of the second head 21 into the annular groove of the first head 11 during operation, thus improving the convenience of operation.

[0033] In some embodiments, the central angle of the annular protrusion and / or the annular groove is greater than 45 degrees and less than 180 degrees. Within this angle range, the annular protrusion and the annular groove can provide sufficient contact area, thereby enhancing the locking stability between the two and ensuring that the adjustable injection device 10 remains in a fixed position during puncture. It can also reduce stress concentration in the locking part, thereby reducing the risk of material fatigue and fracture caused by stress concentration.

[0034] In some embodiments, the length of the first penetrating tube 12 is less than the length of the second penetrating tube 22, and the length difference between the first penetrating tube 12 and the second penetrating tube 22 is 2-3 cm. The length difference allows the adjustable injection device 10 to adapt to the puncture structure of different patients, especially for those patients who require a greater puncture depth. It can ensure that the needle can reach the expected blood vessel or tissue without puncture failure or over-puncture due to individual differences. The length difference of 2-3 cm improves the accuracy and safety of puncture, while also reducing the risk of complications during the operation.

[0035] In some embodiments, the first penetration tube 12 and / or the second penetration tube 22 are made of stainless steel. Stainless steel can operate safely for extended periods at temperatures ranging from -270°C to 400°C. It does not release harmful substances regardless of temperature, exhibiting highly stable material properties. Furthermore, the smooth inner wall of the stainless steel tube reduces resistance, minimizing pressure loss on the adjustable injection device 10 and lowering the cost of delivering the second needle 2. In addition, stainless steel possesses excellent compressive and impact resistance, high tensile strength, and is suitable for various applications. It also exhibits good chemical properties such as rust resistance, oxidation resistance, acid and alkali resistance, and good resistance to intergranular corrosion.

[0036] In some embodiments, the outer surfaces of the first head 11 and the second head 21 are conical, and the conical surfaces have a large operating space, which makes it convenient for medical operators to rotate the annular protrusion on the second head 21 and then engage it in the annular groove of the first head 11.

[0037] In some embodiments, the penetration openings of the first penetrating tube 12 and the second penetrating tube 22 have bevels. The puncture needle with the bevel facing downwards makes a small "^" shaped incision in the blood vessel, resulting in a smaller overall cut length, less damage to the blood vessel, and precise control of the needle insertion path.

[0038] The adjustable injection device 10 of this embodiment also includes auxiliary structures such as a sterile cover, a sealing plug, and a catheter to ensure the sterility and safety of the puncture process. In use, when the needle of the first penetrating tube 12 loses its ability to penetrate tissue, the adjustable injection device 10 extends the second penetrating tube 22, located inside the first penetrating tube 12, along the axial direction of the first penetrating tube 12. This allows the second penetrating tube 22 to extend outward past the needle of the first penetrating tube 12, increasing the overall penetration depth of the adjustable injection device 10. This allows it to penetrate thicker tissues and deeper blood vessels. After extending the second needle 2 and confirming that it is firmly fixed relative to the first needle 1, the puncture operation continues. This improves the applicability of the adjustable injection device 10 and reduces waste of consumables and patient costs. Furthermore, by precisely controlling the length of the second needle 2 extending relative to the first needle 1, damage to surrounding tissues during puncture can be reduced, and potential complications during the puncture process can be minimized.

[0039] The various embodiments of this utility model have now been described in detail. To avoid obscuring the concept of this utility model, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solution of this utility model based on the above description.

[0040] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any manner.

Claims

1. An adjustable injection device (10) characterized by, The adjustable injection device (10) comprises a first needle (1) and a second needle (2), the first needle (1) comprises a first penetrating tube (12) and a first head (11), the second needle (2) comprises a second penetrating tube (22) and a second head (21); the first penetrating tube (12) is fixedly connected to the first head (11), the second penetrating tube (22) is fixedly connected to the second head (21); the second penetrating tube (22) is axially movably nested in the first penetrating tube (12), the length of the second penetrating tube (22) is greater than the length of the first penetrating tube (12). The adjustable injection device (10) is configured to: when the second head (21) moves to the inside of the first head (11) and is fixed relative to the first head (11) in the length direction of the first penetrating tube (12), the second penetrating tube (22) is at least partially arranged outside the first penetrating tube (12).

2. The adjustable injection device (10) according to claim 1, characterized in that The outside of the second head (21) is provided with a second clamping part (211), the inside of the first head (11) is provided with a first clamping part (111), and the first clamping part (111) and the second clamping part (211) are clamped with each other.

3. An adjustable injection device (10) according to claim 2, characterized in that The second clamping part (211) is an annular protrusion, the first clamping part (111) is an annular groove, and the annular protrusion is clamped in the annular groove after rotation.

4. An adjustable injection device (10) according to claim 3, characterized in that The annular protrusion is arranged at 3 / 4 of the height of the second head (21), and the annular groove is arranged at 2 / 3 of the height of the first head (11).

5. The adjustable injection device (10) according to claim 3, characterized in that The central angle of the annular protrusion and / or the annular groove is greater than 45 degrees and less than 180 degrees.

6. The adjustable injection device (10) according to any of claims 1-5, characterized in that, The length of the first penetrating tube (12) is less than the length of the second penetrating tube (22), and the difference between the lengths of the first penetrating tube (12) and the second penetrating tube (22) is 2-3 cm.

7. The adjustable injection device (10) according to any of claims 1-5, characterized in that, The material of the first penetrating tube (12) and / or the second penetrating tube (22) is stainless steel.

8. The adjustable injection device (10) according to any of claims 1-5, characterized in that, The outer side surface of the first head (11) and the second head (21) is a conical surface.

9. The adjustable injection device (10) according to any of claims 1-5, characterized in that, The penetration port of the first penetrating tube (12) and the second penetrating tube (22) has an inclined surface.

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