Puncture needle

Abstract

The utility model discloses a puncture needle, including the outer tube, the needle tip of outer tube is equipped with 1~2 through -hole, the inner diameter of one end of through -hole close to the outer surface of outer tube is greater than the inner diameter of one end close to the inner surface of outer tube 1. The utility model discloses, through setting the through -hole at the tip of outer tube, the hole is as the reflection structure, enhances ultrasonic reflection, simultaneously as the liquid guiding structure, reduces the influence of tissue deformation, and the accuracy is high.

Description

Technical Field

[0001] This utility model relates to a medical device, and more particularly to a puncture needle. Background Technology

[0002] Nerve block involves injecting local anesthetic around the nerve trunk, plexus, or ganglion to block impulse conduction and induce anesthesia in the area it innervates. A puncture needle is required to accurately locate the nerve. Ultrasound imaging uses an ultrasound beam to scan the human body and obtains images of internal organs by receiving and processing the reflected signals. The outer surface of the puncture needle is often a smooth cylindrical structure. In practice, if the puncture needle forms an angle with the sound beam generator, specular reflection can easily occur, causing the receiver to fail to receive the reflected signal and resulting in no imaging.

[0003] To improve the accuracy of ultrasound imaging of puncture needles, existing puncture needles typically have a coating or special structure added to the outer surface of the sheath to enhance imaging resolution. Examples include the prism, ring, and raised structures disclosed in patent applications CN 101227862 A, JPH1176254A, CN213883433U, and CN 221980836U. While existing solutions help increase the ultrasound imaging resolution of the needle before drug injection, during drug injection, the local tissue at the needle tip expands, affecting the operator's ability to accurately determine the needle tip's position. Utility Model Content

[0004] Purpose of the utility model: The purpose of this utility model is to provide a puncture needle to improve the accuracy of needle tip visualization during drug injection.

[0005] Technical solution: The puncture needle of this utility model includes an outer tube, the needle tip of the outer tube is provided with 1 to 2 through holes, and the inner diameter of the end of the through hole near the outer surface of the outer tube is larger than the inner diameter of the end near the inner surface of the outer tube.

[0006] Preferably, in order to maintain the needle tip strength, the through hole is 3-5 mm away from the needle tip of the outer tube.

[0007] Preferably, in order to reduce interference with the liquid medicine and prevent the liquid medicine from deviating from the expected position, the diameter of the through hole at its maximum point shall not exceed 2 mm, and the diameter at its minimum point shall not be less than 0.4 mm.

[0008] Preferably, there are two through holes, symmetrically arranged along the centerline of the outer tube 1.

[0009] Preferably, in order to reduce tissue damage during the puncture process, the sidewall of the through hole is arc-shaped, and the arc-shaped opening faces the outer surface or inner surface of the outer tube.

[0010] Preferably, the outer surface of the outer tube behind the through hole is provided with a plurality of protrusions, the protrusions being wavy and distributed along the length direction of the outer tube.

[0011] Preferably, the outer surface of the outer tube is coated with a polyurethane coating.

[0012] Preferably, the outer tube is provided with a bypass channel at its tail end, and the angle between the axis of the bypass channel and the axis of the outer tube is approximately 30° to 45°.

[0013] Preferably, the bypass channel entrance end is widened, and the maximum diameter of the bypass channel is no more than 2mm, and the minimum diameter is no less than 1mm.

[0014] Preferably, the bypass channel entrance end is provided with a removable sealing plug.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following advantages: 1. High imaging stability during drug injection: The orifice itself acts as a reflective structure, enhancing ultrasonic reflection. At the same time, as a drug liquid guiding structure, it reduces the influence of tissue deformation, resulting in high accuracy; 2. Easy to process: The orifice is larger on the outside and smaller on the inside, with a regular shape, making it easy to process; 3. Good biocompatibility, avoiding unnecessary damage during puncture; 4. Equipped with venting function, effectively preventing embolism. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the outer tube structure of the puncture needle of this utility model;

[0017] Figure 2 for Figure 1 Enlarged view at point B in the middle;

[0018] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0019] Figure 4 This is a cross-sectional view of the through-hole structure of the puncture needle outer tube in the first embodiment;

[0020] Figure 5 This is a cross-sectional view of the through-hole structure of the puncture needle in the second embodiment. Detailed Implementation

[0021] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0022] Example 1: As Figure 1 As shown, this utility model discloses a puncture needle, which mainly consists of two parts: an outer tube 1 and a needle core 2 (not shown). The outer tube 1 is a hollow cylindrical tube, and the needle core 2 is a solid tube located inside the outer tube 1. The outer diameter of the needle core 2 is equal to the inner diameter of the outer tube 1. The needle core 2 is used to support the outer tube 1 and ensure that the internal passage of the outer tube 1 is unobstructed before injection. Figure 2The needle tip of the outer tube 1 is provided with through holes 11, the number of which is 1 to 2. The number of holes is set according to different probes. If it is a curved array or linear array probe, the number of holes is 1; if it is a phased array probe, the number of holes is 2. They are symmetrically arranged on both sides of the center line of the needle tip of the outer tube 1. By setting through holes 11, part of the drug solution injected through the needle tube 2 can flow out through the through holes 11, reducing the expansion of the tissue part pierced by the needle tip and affecting the imaging effect.

[0023] The through hole 11 is 3-5 mm away from the tip of the needle in the outer tube 1. Without affecting the sharpness of the needle tip puncture or the strength of the needle tube, it can maximize the effect of ultrasound imaging.

[0024] The through-hole 11 has a structure that is larger at the top and smaller at the bottom, meaning that the inner diameter of the end closer to the outer surface of the outer tube 1 is larger than the inner diameter of the end closer to the inner surface of the outer tube 1. This structure causes the sidewall of the through-hole 11 to be inclined, increasing ultrasonic reflection. The diameter of the through-hole 11 at its maximum point does not exceed 2 mm, and the diameter at its minimum point is not less than 0.4 mm, to ensure sufficient ultrasonic reflection area and allow the liquid medicine to flow out smoothly to an acceptable position.

[0025] like Figure 4 The sidewall of the through hole 11 is arc-shaped, and the arc-shaped opening faces the outer surface of the outer tube 1. The end connecting the through hole 11 and the outer surface of the outer tube 1 can be rounded to avoid unnecessary damage to the surrounding tissue during puncture, reduce the risk of tissue tearing and bleeding, and reduce the scattering and attenuation of the hole edge, making the ultrasound reflection signal clearer and more accurate.

[0026] The outer surface of the outer tube behind the through hole 11 is provided with several protrusions 14. The protrusions 14 are wavy and distributed along the length of the outer tube 1 to increase ultrasonic reflection and scattering.

[0027] The outer tube 1 can be coated with a polyurethane coating to improve its biocompatibility and, to some extent, increase ultrasonic reflection and scattering.

[0028] Based on this, a bypass channel 12 is provided at the tail end of the outer tube 1, forming an independent opening at the tail end of the outer tube to facilitate rapid venting. The inner diameter of the bypass channel 12 is 1–1.5 mm. The angle between the axis of the bypass channel 12 and the axis of the outer tube 1 is approximately 30°–45°, reducing the residue of the medicine in the bypass channel 12, and facilitating venting and injection operations during operation, preventing operational difficulties or medicine leakage due to excessive angle. The inlet end of the bypass channel 12 is flared to form a trumpet shape, with an inlet diameter of approximately 1.5–2 mm, reducing operational resistance. A sealing plug 13 is provided at the inlet end of the bypass channel 12. Before puncture, the sealing plug 13 (not shown) is inserted into the bypass channel 12 to prevent medicine leakage and the entry of external impurities. When venting is required, the sealing plug 13 is removed.

[0029] Example 2: Based on Example 1, this example has the following variations: Figure 5 The sidewall of the through hole 11 is arc-shaped, and the arc-shaped opening faces the inner surface of the outer tube 1. When the puncture needle and the sound beam generating device form a certain angle, it is easy to reflect the sound. At the same time, it makes a smooth transition between the outer surface of the outer tube 1 and the sidewall of the through hole 11, and reduces the through hole 11 from being blocked by tissue.

Claims

1. A puncture needle, comprising an outer tube (1), characterized in that, The needle tip of the outer tube (1) is provided with 1 to 2 through holes (11), and the inner diameter of the end of the through hole (11) near the outer surface of the outer tube (1) is larger than the inner diameter of the end near the inner surface of the outer tube (1).

2. The puncture needle according to claim 1, characterized in that, The through hole (11) is 3-5 mm away from the tip of the needle in the outer tube (1).

3. The puncture needle according to claim 1, characterized in that, The diameter of the through hole (11) at its maximum point does not exceed 2 mm, and the diameter at its minimum point is not less than 0.4 mm.

4. The puncture needle according to claim 1, characterized in that, There are two through holes (11), which are symmetrical along the centerline of the outer tube (1).

5. The puncture needle according to claim 1, characterized in that, The sidewall of the through hole (11) is arc-shaped, and the arc-shaped opening faces the outer or inner surface of the outer tube (1).

6. The puncture needle according to claim 1, characterized in that, The outer surface of the outer tube behind the through hole (11) is provided with several protrusions (14), which are wavy and distributed along the length of the outer tube (1).

7. The puncture needle according to claim 1, characterized in that, The outer surface of the outer tube (1) is coated with a polyurethane coating.

8. The puncture needle according to any one of claims 1 to 7, characterized in that, The outer tube (1) is provided with a bypass channel (12) at its tail end. The angle between the axis of the bypass channel (12) and the axis of the outer tube (1) is about 30° to 45°.

9. The puncture needle according to claim 8, characterized in that, The bypass channel (12) has an enlarged inlet end, and the diameter of the bypass channel (12) at its maximum point does not exceed 2 mm and the diameter at its minimum point is not less than 1 mm.

10. The puncture needle according to claim 8, characterized in that, The bypass channel (12) has a removable sealing plug (13) at its entrance end.

Images