A pre-puncture navigation needle

Abstract

The utility model discloses a kind of pre-puncture navigation needles, it is related to medical instrument technical field, mainly including core needle assembly and sleeve assembly, core needle assembly includes core needle tube, needle and position sensor, the end of core needle tube is fixedly connected with needle, position sensor is set in needle interior and close to the needle tip position of needle head, for the position of needle head, sleeve assembly includes outer sleeve, outer sleeve is used to sleeve core needle tube, the needle tip of needle head extends outer sleeve.The utility model needle tip is used for puncturing human tissue, position sensor is set in more close to the position of needle tip, ensure that position sensor can more truly reflect the real-time position of needle tip, so that pre-puncture navigation needle is in puncture use process, not by needle body deformation to cause the influence of precision reduction, navigation precision is high, reduce the harm caused to patient by repeated puncture.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a pre-puncture navigation needle. Background Technology

[0002] Percutaneous or tissue aspiration refers to the process of using a puncture needle (or ablation electrode or other instruments with a needle-like design to penetrate the body) to reach the inside of a designated human tissue. It is a key step in many minimally invasive surgeries (such as liver tumor ablation surgery).

[0003] Currently, the common solution for devices that can obtain the position of the puncture needle in real time during puncture is to introduce an electromagnetic positioning module. Electromagnetic sensors are attached to the ultrasound probe and the puncture needle body respectively. Under the action of the magnetic field generator, the navigation host obtains the spatial position of the ultrasound probe and the puncture needle, thereby projecting the puncture needle and the puncture path completely orthogonally onto the ultrasound scanning plane.

[0004] However, in the process of implementing electromagnetic navigation, the internal structure of the puncture needle (such as a microwave ablation needle) typically needs to accommodate functional components and has a liquid cooling system, leaving insufficient space for an integrated electromagnetic sensor. Therefore, the electromagnetic sensor is usually fixed to the outside of the needle body near the needle tail. The hollow puncture needle body, due to its poor rigidity, is prone to bending and deformation during insertion. This can not only damage internal components but, more importantly, because the needle tip and tail are not collinear, the navigation system cannot simulate the actual position of the needle tip using the electromagnetic sensor placed at the needle tail. This affects navigation accuracy, potentially requiring multiple punctures to correct deviations and causing repeated harm to the patient.

[0005] Patent CN116650081A discloses a coaxial puncture needle and puncture system based on electromagnetic navigation. The system involves setting up a navigation needle that wraps around an electromagnetic sensor and then placing it inside the puncture body. Since the navigation needle has a larger volume than the electromagnetic sensor, the volume of the electromagnetic sensor wrapped by the navigation needle will also be larger, which makes it impossible to place the electromagnetic sensor at the needle tip, resulting in inaccurate position display.

[0006] Therefore, a pre-puncture navigation needle is needed, with the sensor positioned at the needle tip, so that the pre-puncture navigation needle is not affected by the decrease in accuracy caused by needle deformation during puncture, resulting in high navigation accuracy and reducing the harm to patients caused by repeated punctures. Utility Model Content

[0007] The purpose of this invention is to provide a pre-puncture navigation needle to solve the problems existing in the prior art, so that the pre-puncture navigation needle is not affected by the reduction in accuracy caused by needle deformation during puncture, has high navigation accuracy, and reduces the harm to patients caused by repeated punctures.

[0008] To achieve the above objectives, this utility model provides the following solution:

[0009] This utility model provides a pre-puncture navigation needle, including a core needle assembly and a cannula assembly. The core needle assembly includes a core needle tube, a needle tip, and a position sensor. The end of the core needle tube is fixedly connected to the needle tip. The position sensor is disposed inside the needle tip and near the needle tip to indicate the position of the needle tip. The cannula assembly includes an outer tube for covering the core needle tube, and the needle tip of the needle tip extends out of the outer tube.

[0010] Preferably, the core needle tube is a round tube with openings at both ends, and the needle tip is embedded in the core needle tube and fixedly connected.

[0011] Preferably, the needle assembly further includes a needle handle, which is used to nest the end of the needle tube away from the needle tip, and the center of the needle handle is through and communicates with the cavity of the needle tube for threading the cable of the position sensor.

[0012] Preferably, the cannula assembly further includes a cannula seat for nesting the end of the outer cannula away from the needle, and the center of the cannula seat is through and connected to the mandrel handle.

[0013] Preferably, the sleeve seat is threadedly connected to the core needle handle.

[0014] Preferably, the needle tip extends 4.5mm-5.5mm beyond the outer sheath.

[0015] Preferably, the outer sheath is provided with scale lines for reading the depth of the core needle tube entering the human body.

[0016] Preferably, the sensor is an electromagnetic sensor.

[0017] Preferably, the electromagnetic sensor is snapped into the center of the needle tip.

[0018] The present invention achieves the following technical advantages over the prior art:

[0019] The core needle assembly of this utility model includes a core needle tube, a needle tip, and a position sensor. The end of the core needle tube is fixedly connected to the needle tip. The position sensor is located inside the needle tip and near the needle tip to indicate the position of the needle tip. The cannula assembly includes an outer cannula for housing the core needle tube. The needle tip extends out of the outer cannula and is used to puncture human tissue. The position sensor is located closer to the needle tip to ensure that it can more accurately reflect the real-time position of the needle tip. This ensures that the pre-puncture navigation needle is not affected by the reduced accuracy caused by needle deformation during puncture, resulting in high navigation accuracy and reducing the harm to the patient caused by repeated punctures. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments 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.

[0021] Figure 1 This is a schematic diagram of the pre-puncture navigation needle in an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the core pin assembly in an embodiment of the present invention;

[0023] Figure 3 for Figure 2 Enlarged view of point I in the middle;

[0024] Figure 4 This is a schematic diagram of the sleeve assembly in an embodiment of the present utility model;

[0025] Figure 5 This is a schematic diagram of the sleeve assembly and the core needle assembly before they are connected in an embodiment of this utility model;

[0026] Figure 6 This is a schematic diagram of the sleeve assembly and the core needle assembly connected in an embodiment of this utility model.

[0027] In the figure: 1-Pre-puncture navigation needle body; 2-Core needle assembly; 21-Core needle handle; 22-Core needle tube; 23-Position sensor; 231-Cable; 24-Needle; 3-Cannula assembly; 31-Cannula seat; 32-Outer cannula. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] The purpose of this invention is to provide a pre-puncture navigation needle to solve the problems existing in the prior art, so that the pre-puncture navigation needle is not affected by the reduction in accuracy caused by needle deformation during puncture, has high navigation accuracy, and reduces the harm to patients caused by repeated punctures.

[0030] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figures 1-6 As shown, this utility model provides a pre-puncture navigation needle, including a pre-puncture navigation needle body 1. The pre-puncture navigation needle body 1 includes a core needle assembly 2 and a cannula assembly 3. The core needle assembly 2 includes a core needle tube 22, a needle tip 24, and a position sensor 23. The end of the core needle tube 22 is fixedly connected to the needle tip 24. The position sensor 23 is disposed inside the needle tip 24 and near the needle tip to indicate the position of the needle tip 24. The cannula assembly 3 includes an outer tube 32 for housing the core needle tube 22. The needle tip of the needle tip 24 extends out of the outer tube 32 and is used to puncture human tissue. The position sensor 23 is disposed closer to the needle tip. The position sensor 23 is positioned to ensure that the position sensor 23 can more accurately reflect the real-time position of the needle tip, so that the pre-puncture navigation needle is not affected by the reduction in accuracy caused by needle deformation during puncture. The navigation accuracy is high. The pre-puncture navigation needle body 1 is used to replace the ablation needle for pre-puncture. After the pre-puncture navigation needle body 1 reaches the target tissue under the guidance of the position sensor 23, the core needle assembly 2 is pulled out from the cannula assembly 3. The cavity inside the cannula assembly 3 forms an instrument channel. Then, the ablation needle is inserted from the external end of the cannula assembly 3 and enters through the instrument channel. After reaching the target tissue, ablation is performed, which can reduce the harm caused to the patient by repeated puncture of the ablation needle.

[0032] In this embodiment, the core needle tube 22 is a round tube with openings at both ends. The needle 24 is embedded in the core needle tube 22 and fixedly connected. The needle 24 with position sensor 23 is designed separately from the core needle tube 22. Even if the tube body of the core needle tube 22 is deformed during use, the needle 24 with position sensor 23 can be removed separately and installed on a new core needle tube 22, saving costs.

[0033] In this embodiment, the needle assembly 2 further includes a needle handle 21. The needle handle 21 is used to nest the end of the needle tube 22 away from the needle tip 24, and the center of the needle handle 21 is open and communicates with the cavity of the needle tube 22. It is used to thread the cable 231 of the position sensor 23 through the tube. The cable 231 is finally connected to the navigation system through a connector. The needle handle 21 and the needle tube 22 are used to accommodate the connection cable 231 of the position sensor 23, making full use of space. It should be noted that the position sensor 23 can also use wireless transmission, but the traditional wired transmission 231 has higher accuracy, stronger reliability and relatively lower cost.

[0034] In this embodiment, the cannula assembly 3 further includes a cannula seat 31, which is used to nest the end of the outer cannula 32 away from the needle tip 24. The center of the cannula seat 31 is through and connected to the core needle handle 21. After the cannula seat 31 is connected to the core needle handle 21, the distance from the needle tip extending out of the outer cannula 32 is 4.5mm-5.5mm, preferably 5mm. At this time, the needle tip 24 just extends completely out of the outer cannula 32, so that the main body of the position sensor 23 is entirely located outside the outer cannula 32, which can ensure strong signal and make the real-time position of the needle tip more obvious.

[0035] In this embodiment, the sleeve seat 31 is threadedly connected to the core needle handle 21, which facilitates installation and disassembly. It should be noted that other types of connection methods can also be used, but it is necessary to ensure that disassembly is possible, such as snap-fit.

[0036] In this embodiment, the outer sheath 32 is provided with scale lines to read the depth of the core needle tube 22 entering the human body and to provide a reference.

[0037] In this embodiment, the position sensor 23 is an electromagnetic sensor. Electromagnetic sensors have high positioning accuracy and are convenient for fluoroscopic examination, reducing surgical risks.

[0038] In this embodiment, the electromagnetic sensor is snapped into the center of the needle 24, which effectively avoids the electromagnetic sensor being off-center relative to the needle 24, so that the electromagnetic sensor is always in the center of the needle 24 and more accurately reflects the position of the needle 24.

[0039] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A pre-puncture navigation needle, characterized in that: The device includes a core needle assembly and a cannula assembly. The core needle assembly includes a core needle tube, a needle tip, and a position sensor. The end of the core needle tube is fixedly connected to the needle tip. The position sensor is located inside the needle tip and near the needle tip to indicate the position of the needle tip. The cannula assembly includes an outer cannula for covering the core needle tube, and the needle tip of the needle tip extends out of the outer cannula.

2. The pre-puncture navigation needle according to claim 1, characterized in that: The core needle tube is a round tube open at both ends, and the needle is embedded in the core needle tube and fixedly connected.

3. The pre-puncture navigation needle according to claim 2, characterized in that: The needle assembly also includes a needle handle, which is used to nest the end of the needle tube away from the needle tip, and the center of the needle handle is through and communicates with the cavity of the needle tube for threading the cable of the position sensor.

4. The pre-puncture navigation needle according to claim 3, characterized in that: The cannula assembly further includes a cannula seat for nesting the end of the outer cannula away from the needle, and the center of the cannula seat is through and connected to the mandrel handle.

5. The pre-puncture navigation needle according to claim 4, characterized in that: The sleeve seat is threadedly connected to the core needle handle.

6. The pre-puncture navigation needle according to claim 1, characterized in that: The needle tip extends 4.5mm-5.5mm beyond the outer sheath.

7. The pre-puncture navigation needle according to claim 1, characterized in that: The outer sheath is provided with scale lines for reading the depth of the core needle tube entering the human body.

8. The pre-puncture navigation needle according to claim 1, characterized in that: The position sensor is an electromagnetic sensor.

9. The pre-puncture navigation needle according to claim 8, characterized in that: The electromagnetic sensor is snapped into the center of the needle tip.

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