Memory alloy puncture needle
By utilizing the electrothermal bending mechanism of the nickel-titanium shape memory alloy needle tip, the problems of needle tip misalignment and local damage in ultrasound-guided cyst irrigation treatment have been solved, achieving a more efficient and safer surgical procedure.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN SHUIXIANG CENT HOSPITAL
- Filing Date
- 2025-04-14
- Publication Date
- 2026-06-12
AI Technical Summary
In current ultrasound-guided interventional cyst irrigation treatment, there is a high risk of needle tip misalignment and significant local damage, affecting surgical efficiency and safety.
The needle tip, made of nickel-titanium shape memory alloy, is electrically heated to bend at a phase transition temperature to avoid off-target and returns to an upright position after treatment. Combined with a stainless steel needle body and guidewire assembly, the stability of the needle tip is ensured.
It effectively reduces the risk of needle tip misalignment, minimizes local damage, and improves surgical efficiency and safety.
Smart Images
Figure CN224344985U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and in particular to a shape memory alloy puncture needle. Background Technology
[0002] Ultrasound-guided interventional procedures, performed under ultrasound monitoring or guidance, utilize needles, ablation needles, and drainage tubes to complete various puncture biopsies, aspirations, catheterizations, and drug injections. Ultrasound-guided interventional procedures offer numerous advantages, including being non-invasive, requiring no incisions or punctures, safe and painless with fine-needle punctures, low recurrence rate, and no hospitalization required. They can avoid certain surgical procedures while achieving results comparable to surgical procedures. Therefore, ultrasound-guided interventional techniques have gained increasing attention and application.
[0003] Ultrasound-guided cyst irrigation is a common interventional procedure suitable for the treatment of cystic lesions in various systems, such as chocolate cysts or renal cysts in the female reproductive system. The main steps of ultrasound-guided cyst irrigation are as follows, taking ovarian chocolate cysts as an example: (1) Disinfect the body surface and administer local anesthesia. Under ultrasound guidance, insert the puncture needle into the cyst, remove the needle cap, and connect the syringe to the needle tip. (2) Repeatedly aspirate the cyst fluid until about 85% of the fluid is removed. (3) Fill the syringe with saline solution and quickly inject it into the cyst. After standing for about 10 seconds, withdraw the entire solution to achieve the purpose of irrigation. (4) Repeat step 3 until the aspirated fluid is nearly clear and colorless. (5) Fill the syringe with medication (anhydrous alcohol or polidocanol) and inject it into the cyst. The total amount injected should generally reach 1 / 3 of the cyst cavity. If the amount injected in one injection is not reached, repeat the above steps until the target is achieved. (6) Allow the medication to remain in the cyst for 15 minutes to achieve the therapeutic purpose of inactivating the cyst wall cells. (7) Draw out the medication, remove the needle, disinfect the puncture site, cover with gauze, and the surgery is complete.
[0004] During cyst aspiration, repeated aspiration is required, and there is a risk of "off-target" displacement after the cyst shrinks. During cyst aspiration and irrigation, as the cyst shrinks, the cyst and needle tip may shift relative to each other, potentially causing the needle tip to dislodge from the cyst wall—a phenomenon known as "off-target." Off-target displacement signifies surgical failure; the success rate of re-puncture after cyst shrinkage is extremely low, generally requiring a second surgery after cyst recurrence. Currently, to mitigate this risk, a method of "not completely aspirating the cyst fluid at once" is generally adopted. After aspirating 85% of the cyst fluid, cyst cavity irrigation is performed, retaining 15% of the fluid each time. However, this method increases the number of irrigations, making the procedure more cumbersome and prolonging the operation. Furthermore, during cyst aspiration and irrigation, the needle tip is located inside the cyst, and as the cyst shrinks, the safe area for the needle tip gradually decreases. Improper operation or poor patient cooperation can lead to local damage, including to muscles, nerves, and blood vessels, increasing patient pain and recovery time.
[0005] Therefore, it is necessary to provide a shape memory alloy puncture needle whose tip can be bent as needed to reduce the risk of needle tip misalignment during surgery, while also reducing the risk of local puncture damage, thereby improving surgical efficiency and safety. Utility Model Content
[0006] The purpose of this invention is to provide a shape memory alloy puncture needle whose tip can be bent as needed to reduce the risk of needle tip missing the target during surgery, while also reducing the risk of local puncture damage, thereby improving surgical efficiency and safety.
[0007] To achieve the above objectives, this utility model provides a shape memory alloy puncture needle, comprising:
[0008] The puncture needle body has a hollow tube inside, including a needle tip and needle body with an integral structure. The needle tip is made of nickel-titanium shape memory alloy, and the needle body is made of stainless steel. A positive electrode guide wire and a negative electrode guide wire are installed inside the needle body.
[0009] The needle holder has a hollow cavity. The end of the needle body away from the needle tip is connected to one end of the needle holder, and the tube is connected to the cavity. The needle holder is provided with a positive contact and a negative contact. One end of the positive guide wire is connected to the needle tip, and the other end is connected to the positive contact. One end of the negative guide wire is connected to the needle tip, and the other end is connected to the negative contact. The positive and negative contacts are energized and heated to make the needle tip curl to a preset state.
[0010] Compared with existing technologies, the shape memory alloy puncture needle of this invention includes a puncture needle body and a needle hub. The puncture needle body includes a needle tip and a needle body. The needle tip is made of nickel-titanium shape memory alloy, and the phase transition temperature of the needle tip is set to 40-42 degrees Celsius. When heated to 40-42 degrees Celsius, the nickel-titanium shape memory alloy reaches the phase transition temperature, and the needle tip can be curled. The needle body is made of stainless steel and can remain straight when the needle tip is curled. A positive electrode wire and a negative electrode wire are provided within the needle body. The positive electrode wire is used to electrically connect the positive contacts on the needle tip and the needle hub, and the negative electrode wire is used to electrically connect the negative contacts on the needle tip and the needle hub. The needle hub has a hollow cavity. The end of the needle body away from the needle tip is connected to one end of the needle hub, and a conduit is connected to the cavity. The cavity can be connected to a syringe, etc., to allow the fluid to be drawn out through the conduit and the cavity. During cyst fluid aspiration, the cyst gradually shrinks as the fluid is extracted. When the cyst shrinks to a certain extent, the tip of the puncture needle easily detaches from the cyst. Applying electricity to the positive and negative contacts to increase their temperature, causing the needle tip to curl to a preset state, can prevent the needle tip from detaching from the cyst. Specifically, the electrical output device is connected to the positive and negative contacts and energized with a specific voltage. This causes the nickel-titanium shape memory alloy needle tip to reach and maintain its phase transition temperature, resulting in a bent tip with a larger radial value, making it less likely to detach from the cyst and allowing for better fluid aspiration and irrigation. After the fluid aspiration and irrigation treatment is completed, the power is stopped, the needle tip is returned to its vertical position, and after confirmation by ultrasound, the puncture needle is removed. This invention's shape memory alloy puncture needle tip can be bent as needed, reducing the risk of needle tip misalignment during surgery and minimizing the risk of local puncture damage, thereby improving surgical efficiency and safety.
[0011] Preferably, the needle hub is made of plastic.
[0012] Preferably, the needle holder has a first groove and a second groove, and both the first groove and the second groove are coated with a conductive layer to form a positive contact and a negative contact.
[0013] Preferably, one end of the positive electrode wire passes through the needle holder and is fixed in the first groove to be electrically connected to the positive electrode contact.
[0014] Preferably, one end of the negative electrode wire passes through the needle holder and is fixed in the second groove to be electrically connected to the negative electrode contact.
[0015] Preferably, both the positive and negative guide wires are sealed to the needle hub.
[0016] Preferably, both the positive and negative electrode wires include a first conductive end and a second conductive end, with the first conductive end connected to the needle tip and the second conductive end connected to the positive / negative contact.
[0017] Preferably, a connecting segment is provided between the first conductive end and the second conductive end, the connecting segment is coated with an insulating layer, and a boron nitride nanotube layer is sprayed onto the insulating layer, the thickness of the boron nitride nanotube layer being between 20 and 50 micrometers.
[0018] Preferably, the needle body is provided with a first groove and a second groove. The first groove is located on one side of the tube wall, and the second groove is located on the other side of the tube wall. The first groove is used to accommodate the positive electrode wire, and the second groove is used to accommodate the negative electrode wire. The positive electrode wire is fixed in the first groove and the negative electrode wire is fixed in the second groove by laser welding.
[0019] Preferably, a needle cap is detachably connected to the needle hub, and the needle cap covers the cavity. Attached Figure Description
[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are 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 structural diagram of a shape memory alloy puncture needle provided in one embodiment of the present invention.
[0022] Figure 2 yes Figure 1 A structural diagram from another angle.
[0023] Figure 3 yes Figure 1 Structure diagram of another state.
[0024] Figure 4 yes Figure 1 Partial cross-sectional view of the needle hub and guidewire assembly.
[0025] Figure 5 yes Figure 1 A partial sectional view of the needle hub and needle body.
[0026] Figure 6 This is a partial structural diagram of the needle tip and guidewire assembly.
[0027] Figure 7 yes Figure 1 A schematic diagram of a shape memory alloy puncture needle being inserted into a cyst.
[0028] Figure 8 yes Figure 7 A schematic diagram of the local structure where the cyst has shrunk.
[0029] Figure 9 yes Figure 8A schematic diagram of the structure where the tip of the needle is curled up inside the cyst.
[0030] Explanation of reference numerals in the attached figures:
[0031] 100. Shape memory alloy puncture needle; 200. Cyst;
[0032] 10. Puncture needle body; 101. Tube; 11. Needle tip; 12. Needle body; 121. First groove; 122. Second groove; 13. Guide wire assembly; 131. Positive guide wire; 132. Negative guide wire; 133. Insulating layer;
[0033] 20. Needle base; 201. Protrusion; 202. Cavity; 21. First groove; 211. Positive contact; 22. Second groove; 221. Negative contact;
[0034] 30. Needle cap. Detailed Implementation
[0035] To explain the technical content and structural features of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.
[0036] Please see Figures 1 to 3 This invention provides a shape memory alloy puncture needle 100, comprising a puncture needle body 10 and a needle hub 20. The puncture needle body 10 has a hollow tube 101 inside and includes an integrally formed needle tip 11 and needle body 12. The needle tip 11 is made of a nickel-titanium shape memory alloy, which is vertical at room temperature to facilitate puncture. The phase transition temperature of this nickel-titanium shape memory alloy is set between 40-42 degrees Celsius. When the needle tip 11 reaches the phase transition temperature, it can curl up, preventing it from detaching from the cyst 200. The needle body 12 is made of stainless steel, and remains vertical when the needle tip 11 curls up. A guide wire assembly 13 is disposed within the needle body 12, including a positive guide wire 131 and a negative guide wire 132. On the other hand, the needle holder 20 is provided with a hollow cavity 202. The end of the needle body 12 away from the needle tip 11 is connected to one end of the needle holder 20, and the conduit 101 is connected to the cavity 202. A positive contact 211 and a negative contact 221 are provided on the needle holder 20. Specifically, one end of the positive guide wire 131 is connected to the needle tip 11, and the other end is connected to the positive contact 211. One end of the negative guide wire 132 is connected to the needle tip 11, and the other end is connected to the negative contact 221. When the positive contact 211 and the negative contact 221 are energized and heated, when the temperature reaches the phase transition temperature, the needle tip 11 curls to a preset state. Understandably, the preset state can be a curled vortex to prevent the needle tip 11 from detaching from the cyst 200 when the cyst 200 shrinks, thus affecting fluid aspiration.
[0037] Compared with the prior art, the shape memory alloy puncture needle 100 of this utility model includes a puncture needle body 10 and a needle base 20. The puncture needle body 10 includes a needle tip 11 and a needle body 12. The needle tip 11 is made of nickel-titanium shape memory alloy, and the phase transition temperature of the needle tip 11 is set to 40-42 degrees Celsius. When heated to 40-42 degrees Celsius, the nickel-titanium shape memory alloy reaches the phase transition temperature, and the needle tip 11 can be curled. The needle body 12 is made of stainless steel and can remain straight when the needle tip 11 is curled. A positive electrode wire 131 and a negative electrode wire 132 are provided inside the needle body 12. The positive electrode wire 131 is used to electrically connect the needle tip 11 and the positive contact 211 on the needle base 20, and the negative electrode wire 132 is used to electrically connect the needle tip 11 and the negative contact 221 on the needle base 20. The needle hub 20 has a hollow cavity 202. The end of the needle body 12 away from the needle tip 11 is connected to one end of the needle hub 20, and the conduit 101 is connected to the cavity 202. The cavity 202 can be connected to a syringe, etc., so that the cyst fluid can be drawn out through the conduit 101 and the cavity 202. During the process of drawing out the cyst fluid, the cyst 200 will gradually shrink as the fluid is drawn out. When the cyst 200 shrinks to a certain extent, the needle tip 11 of the puncture needle can easily detach from the cyst 200. By energizing and heating the positive contact 211 and the negative contact 221 to curl the needle tip 11 to a preset state, the needle tip 11 can be prevented from detaching from the cyst 200. Specifically, the electrical output device is connected to the positive contact 211 and the negative contact 221 and energized by a certain voltage value. The nickel-titanium shape memory alloy needle tip 11 reaches and maintains its phase transition temperature, causing it to bend. The radial value of the bent needle tip 11 increases, making it less likely to detach from the cyst 200, thus facilitating better aspiration and irrigation. After the aspiration and irrigation treatment is completed, the power is turned off, and the needle tip 11 returns to its vertical position. After confirmation by ultrasound, the puncture needle is removed. This invention's shape memory alloy puncture needle 100 allows the needle tip 11 to bend as needed, reducing the risk of needle tip 11 detaching from the target during surgery and minimizing the risk of local puncture damage, thereby improving surgical efficiency and safety.
[0038] Please see Figures 1 to 5 In some optional embodiments, the needle holder 20 may be made of plastic, and a protrusion 201 is provided protruding from the needle holder 20 along its circumference. A first groove 21 and a second groove 22 are formed inside the needle holder 20, and the first groove 21 and the second groove 22 can penetrate the protrusion 201 of the needle holder 20. The first groove 21 and the second groove 22 are both coated with a conductive layer to form a positive contact 211 and a negative contact 221.
[0039] Please see Figures 4 to 6In some optional embodiments, one end of the positive electrode guide wire 131 passes through the needle holder 20 and is fixed in the first groove 21, electrically connected to the positive electrode contact 211 within the first groove 21. Conversely, one end of the negative electrode guide wire 132 passes through the needle holder 20 and is fixed in the second groove 22, electrically connected to the negative electrode contact 221 within the second groove 22. Both the positive electrode guide wire 131 and the negative electrode guide wire 132 are sealed to the needle holder 20. For example, space can be reserved within the needle holder 20 for the positive electrode guide wire 131 and the negative electrode guide wire 132 to pass through. Then, one end of the positive electrode guide wire 131 can be welded to the positive electrode contact 211, and one end of the negative electrode guide wire 132 can be welded to the negative electrode contact 221. After the positive electrode guide wire 131 and the negative electrode guide wire 132 are electrically connected within the needle holder 20, insulating adhesive, such as medical silicone, can be filled into the needle holder 20 to provide insulation and sealing. Both the positive guidewire 131 and the negative guidewire 132 are sealed to the needle hub 20 to prevent leakage or affect the normal conductivity of the guidewire assembly 13 when extracting the cyst fluid.
[0040] Please see Figures 4 to 6 In some optional embodiments, both the positive electrode wire 131 and the negative electrode wire 132 include a first conductive end and a second conductive end, with the first conductive end connected to the needle tip 11. The second conductive end of the positive electrode wire 131 is connected to the positive electrode contact 211. The second conductive end of the negative electrode wire 132 is connected to the negative electrode contact 221. A connecting segment is provided between the first and second conductive ends, and an insulating layer 133 is coated on the connecting segment. A boron nitride nanotube layer is sprayed onto the insulating layer 133, with a thickness between 20 and 50 micrometers. The boron nitride nanotube layer makes the positive electrode wire 131 and the negative electrode wire 132 stronger and more heat-resistant, and also provides good thermal and electrical conductivity.
[0041] Please see Figures 4 to 6 In some optional embodiments, the needle body 12 is provided with a first groove 121 and a second groove 122. The first groove 121 is located on one side of the tube wall, and the second groove 122 is located on the other side of the tube wall. The first groove 121 is used to accommodate the positive electrode guide wire 131, and the second groove 122 is used to accommodate the negative electrode guide wire 132. The positive electrode guide wire 131 is fixed in the first groove 121 and the negative electrode guide wire 132 is fixed in the second groove 122 by laser welding. The first groove 121 and the second groove 122 can better accommodate the guide wire assembly 13 and ensure the unobstructed flow of the tube 101.
[0042] Please see Figures 1 to 3In some optional embodiments, a needle cap 30 may be detachably connected to the needle hub 20, covering the cavity 202. When the needle cap 30 is removed, the cavity 202 of the needle hub 20 can be connected to a syringe or other necessary medical devices to better aspirate and irrigate the cyst 200.
[0043] like Figures 1 to 9 As shown, the shape memory alloy puncture needle 100 of this utility model includes a puncture needle body 10 and a needle base 20. The puncture needle body 10 includes a needle tip 11 and a needle body 12. The needle tip 11 is made of nickel-titanium shape memory alloy, and the phase transition temperature of the needle tip 11 is set to 40-42 degrees Celsius. When heated to 40-42 degrees Celsius, the nickel-titanium shape memory alloy reaches the phase transition temperature, and the needle tip 11 can be curled. The needle body 12 is made of stainless steel and can remain straight when the needle tip 11 is curled. A positive electrode guide wire 131 and a negative electrode guide wire 132 are provided inside the needle body 12. The positive electrode guide wire 131 is used to electrically connect the needle tip 11 and the positive contact 211 on the needle base 20, and the negative electrode guide wire 132 is used to electrically connect the needle tip 11 and the negative contact 221 on the needle base 20. The needle hub 20 has a hollow cavity 202. The end of the needle body 12 away from the needle tip 11 is connected to one end of the needle hub 20, and the conduit 101 is connected to the cavity 202. The cavity 202 can be connected to a syringe, etc., so that the cyst fluid can be drawn out through the conduit 101 and the cavity 202. During the process of drawing out the cyst fluid, the cyst 200 will gradually shrink as the fluid is drawn out. When the cyst 200 shrinks to a certain extent, the needle tip 11 of the puncture needle can easily detach from the cyst 200. The needle tip 11 is curled to a preset state to prevent the needle tip 11 from detaching from the cyst 200. Specifically, after surface disinfection and local anesthesia, the shape memory alloy puncture needle 100 is inserted into the cyst 200 under ultrasound guidance. The positive contact 211 and the negative contact 221 are connected through an electrical output device, and a certain voltage value is applied. This causes the nickel-titanium shape memory alloy needle tip 11 to reach and maintain the phase transition temperature, causing the needle tip 11 to bend. After ultrasound observation confirms that the needle tip 11 is bent, the fluid aspiration and irrigation treatment procedure begins. After the fluid aspiration and irrigation procedure is completed, the power is turned off, and the needle tip 11 is restored to a vertical position. After ultrasound observation confirms this, the puncture needle is removed. The needle tip 11 can be bent by applying power at the beginning, or it can be bent by applying power after a certain amount of fluid has been aspirated. The shape memory alloy puncture needle 100 of this invention allows the needle tip 11 to bend as needed, reducing the risk of the needle tip 11 falling off the target during the procedure and lowering the risk of local puncture damage, thereby improving surgical efficiency and safety.
[0044] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall fall within the scope of the present utility model.
Claims
1. A shape memory alloy puncture needle, characterized in that, include: The puncture needle body has a hollow tube inside, including a needle tip and a needle body with an integral structure. The needle tip is made of nickel-titanium shape memory alloy, and the needle body is made of stainless steel. A positive electrode guide wire and a negative electrode guide wire are arranged inside the needle body. The needle holder has a hollow cavity. The end of the needle body away from the needle tip is connected to one end of the needle holder, and the conduit is connected to the cavity. The needle holder has a positive contact and a negative contact. One end of the positive guide wire is connected to the needle tip, and the other end is connected to the positive contact. One end of the negative guide wire is connected to the needle tip, and the other end is connected to the negative contact. The positive and negative contacts are energized and heated to cause the needle tip to curl to a preset state.
2. The shape memory alloy puncture needle according to claim 1, characterized in that, The needle hub is made of plastic.
3. The shape memory alloy puncture needle according to claim 1, characterized in that... The needle holder has a first groove and a second groove, and both the first groove and the second groove are coated with a conductive layer to form the positive electrode contact and the negative electrode contact.
4. The shape memory alloy puncture needle according to claim 3, characterized in that, One end of the positive electrode wire passes through the needle holder and is fixed in the first groove, where it is electrically connected to the positive electrode contact.
5. The shape memory alloy puncture needle according to claim 3, characterized in that, One end of the negative electrode wire passes through the needle holder and is fixed in the second groove, where it is electrically connected to the negative electrode contact.
6. The shape memory alloy puncture needle according to claim 1, characterized in that, Both the positive and negative guide wires are sealed to the needle hub.
7. The shape memory alloy puncture needle according to claim 1, characterized in that, Both the positive electrode wire and the negative electrode wire include a first conductive end and a second conductive end. The first conductive end is connected to the needle tip, and the second conductive end is connected to the positive electrode contact / the negative electrode contact.
8. The shape memory alloy puncture needle according to claim 7, characterized in that, A connecting segment is provided between the first conductive end and the second conductive end. An insulating layer is coated on the connecting segment, and a boron nitride nanotube layer is sprayed onto the insulating layer. The thickness of the boron nitride nanotube layer is between 20 and 50 micrometers.
9. The shape memory alloy puncture needle according to claim 1, characterized in that, The needle body is provided with a first groove and a second groove. The first groove is located on one side of the tube wall and the second groove is located on the other side of the tube wall. The first groove is used to accommodate the positive electrode wire and the second groove is used to accommodate the negative electrode wire. The positive electrode wire is fixed in the first groove and the negative electrode wire is fixed in the second groove by laser welding.
10. The shape memory alloy puncture needle according to claim 1, characterized in that, A needle cap is detachably connected to the needle hub, and the needle cap covers the cavity.