Puncture needle

Abstract

The application provides a puncture needle in the technical field of puncture and puncture technology, and the puncture needle comprises a needle tube, a side tube and a support guide wire, a blade part is arranged at the distal end of the needle tube, and a syringe interface is arranged at the proximal end of the needle tube. One end of the side tube is fixedly arranged at the proximal end of the needle tube, and the inner cavity of the side tube is in communication with the inner cavity of the needle tube. The support guide wire is arranged in the inner cavities of the side tube and the needle tube, the support guide wire is arranged from the inner cavity of the side tube to the distal end direction of the inner cavity of the needle tube, and a blunt head is arranged at the end of the support guide wire close to the distal end, wherein the blunt head is adapted to be switched between a puncture state of being retracted into the inner cavity of the needle tube and a protection state of being extended out of the inner cavity of the needle tube. When the puncture needle enters the pericardial cavity, the blunt head is controlled to be extended out of the inner cavity of the needle tube, so that the blunt head shields the blade part of the needle tube, at this time, the puncture needle is shielded by the blunt head, a protection effect is achieved, direct contact between the puncture needle and the atrium, the ventricle or the coronary artery is avoided, and the puncture needle is prevented from piercing the atrium, the ventricle or the coronary artery.

Description

Technical Field

[0001] This invention relates to the field of puncture technology, and more specifically to a puncture needle. Background Technology

[0002] A puncture needle is a medical device used in minimally invasive surgery to sample and inject tissues from various organs, including the kidneys, liver, lungs, breasts, thyroid gland, prostate, pancreas, testes, uterus, ovaries, and body surface.

[0003] The pericardial cavity is formed between the epicardium and the pericardium, and the pericardium is covered by subcutaneous tissue. When there is a large amount of fluid in the pericardium, the patient's blood circulation is severely disrupted, venous blood cannot return to the heart smoothly, and the heart's pumping function is impaired. Pericardiocentesis to release a large amount of fluid can alleviate or even eliminate the patient's symptoms. Pericardiocentesis is a diagnostic and treatment technique that uses a needle to directly puncture the pericardial cavity. The puncture site should not be too deep to avoid puncturing the atrium, ventricle, or coronary artery, which could cause a large amount of blood to accumulate in the pericardial cavity.

[0004] In existing technology, to prevent the puncture needle from puncturing the atrium during pericardiocentesis, an electrocardiogram (ECG) signal is connected to the tip of the puncture needle. Figure 1 In this single-lead ECG, a negative QRS complex will appear on the electrocardiogram (ECG) when the needle contacts the surface of the heart, alerting the operator to prevent the needle from puncturing the atrium. However, since the ECG only provides this alert when the needle contacts the heart surface, the operator may still puncture the atrium, ventricle, or coronary artery while moving the needle within the pericardial cavity. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that pericardiocentesis may cause the puncture needle to puncture the atrium, ventricle or coronary artery. The present invention provides a puncture needle in which, when the puncture needle enters the pericardial cavity, the blunt tip is controlled to extend out of the needle tube lumen so that the blunt tip blocks the needle tube blade. At this time, the puncture needle is protected by the blunt tip, which avoids direct contact between the puncture needle and the atrium, ventricle or coronary artery, and prevents the puncture needle from puncturing the atrium, ventricle or coronary artery.

[0006] This invention provides a puncture needle, comprising:

[0007] A needle tube with a blade at its distal end and a syringe interface at its proximal end;

[0008] A side tube, one end of which is fixedly disposed on the needle tube near the proximal end, and the inner cavity of the side tube is connected to the inner cavity of the needle tube;

[0009] A support guidewire is inserted from the inner lumen of the side tube toward the distal end of the inner lumen of the needle tube, and a blunt tip is provided at the end of the support guidewire near the distal end; the blunt tip is adapted to switch between a puncture state retracted into the inner lumen of the needle tube and a protective state extended out of the inner lumen of the needle tube.

[0010] According to the present invention, a puncture needle is provided in which a fixing member is fixedly disposed in the inner cavity of the side tube, the fixing member is provided with a through hole, the supporting guide wire passes through the through hole and a connecting part is provided at one end of the through hole, and the radial diameter of the connecting part is larger than the radial diameter of the through hole;

[0011] It also includes a limiting sleeve, which includes an installation part that is detachably disposed at the end of the side tube. A limiting part is coaxially provided on the installation part, and a limiting hole is opened in the axial direction of the limiting part. A locking structure is movably disposed in the limiting hole, and the locking structure is connected to the connecting part.

[0012] According to a puncture needle provided by the present invention, the locking structure includes a connector, the connector passing through the limiting hole and connected to the connecting part, an elastic element being coaxially sleeved on the connector, one end of the elastic element pressing against the connecting part, and the other end pressing against the abutting part of the limiting sleeve, the elastic element applying an elastic force to the connecting part in the direction of the fixing member.

[0013] According to a puncture needle provided by the present invention, a limiting member is fixedly provided on the connector corresponding to the limiting hole. The limiting member is adapted to move or rotate through the limiting hole along the axial direction of the limiting hole to fix the limiting member on one side of the limiting hole.

[0014] According to the present invention, a puncture needle is provided, wherein the limiting member is elongated.

[0015] According to a puncture needle provided by the present invention, the locking structure further includes a pulling member, which is disposed at the end of the connecting member, and the pulling member and the connecting member are respectively disposed on both sides of the limiting sleeve.

[0016] According to a puncture needle provided by the present invention, a placement cavity is provided in the inner cavity of the side tube corresponding to the blunt tip, and the placement cavity is located between the fixing member and the connecting end of the side tube.

[0017] According to a puncture needle provided by the present invention, the angle formed by the side tube and the needle tube axially toward the proximal end is an acute angle.

[0018] According to the present invention, the elastic element of a puncture needle is a spring.

[0019] According to a puncture needle provided by the present invention, the proximal end of the needle tube is chamfered.

[0020] The technical solution of the present invention has at least the following advantages:

[0021] 1. The puncture needle provided by the present invention includes: a needle tube, a side tube, and a support guidewire. The distal end of the needle tube is provided with a cutting edge, and the proximal end of the needle tube is provided with a syringe interface. One end of the side tube is fixedly disposed near the proximal end of the needle tube, and the inner cavity of the side tube is connected to the inner cavity of the needle tube. The support guidewire passes through the inner cavity of the side tube and the inner cavity of the needle tube, extending from the inner cavity of the side tube towards the distal end of the inner cavity of the needle tube. A blunt tip is provided at the distal end of the support guidewire, wherein the blunt tip is adapted to switch between a puncture state retracted into the inner cavity of the needle tube and a protective state extended into the inner cavity of the needle tube.

[0022] This puncture needle has a side tube on one side of the needle tube, and a support guidewire is placed inside the side tube and the inner lumen of the needle tube. The distal end of the support guidewire has a blunt tip. By controlling the support guidewire, the blunt tip is controlled to extend out of and retract into the inner lumen of the needle tube. When the puncture needle punctures subcutaneous tissue, the blunt tip is controlled to retract into the inner lumen of the needle tube, allowing the puncture needle to normally puncture the subcutaneous tissue and pericardium into the pericardial cavity. When the puncture needle enters the pericardial cavity, the blunt tip is controlled to extend out of the inner lumen of the needle tube, so that the blunt tip blocks the cutting edge of the needle tube. At this time, the puncture needle is protected by the blunt tip, preventing direct contact between the puncture needle and the atria, ventricles, or coronary arteries, and preventing the puncture needle from puncturing the atria, ventricles, or coronary arteries. Simultaneously, the blunt tip allows the operator to appropriately advance the puncture needle within the pericardial cavity, ensuring the stability of the puncture needle and preventing it from puncturing the atria, ventricles, or coronary arteries during movement within the pericardial cavity.

[0023] 2. The puncture needle provided by this invention has a fixing member fixedly installed in the inner cavity of the side tube. The fixing member has a through hole for a support guidewire to pass through. A connecting portion is provided at one end of the support guidewire passing through the through hole. The radial diameter of the connecting portion is larger than the radial diameter of the through hole, and the connecting portion is adapted to move within the inner cavity of the side tube. It also includes a limiting sleeve, which includes an mounting portion detachably mounted at the end of the side tube. A limiting portion is coaxially mounted on the mounting portion, and a limiting hole is opened in the axial direction of the limiting portion. A locking structure is movably installed within the limiting hole and connected to the connecting portion. The connecting portion is limited by the fixing member and the limiting sleeve, allowing it to move between the fixing member and the limiting sleeve within the inner cavity of the side tube. This restricts the movement of the blunt tip at the end of the support guidewire. The movement of the connecting portion between the fixing member and the limiting sleeve is controlled by the locking structure, meaning the locking structure can control whether the blunt tip enters or exits the inner cavity of the needle tube.

[0024] 3. The puncture needle provided by the present invention has a locking structure including a connector, which passes through a limiting hole and is connected to a connecting part. An elastic element is coaxially sleeved on the connector, located between the connecting part and the limiting sleeve. One end of the elastic element abuts against the connecting part, and the other end of the elastic element abuts against the abutting part of the limiting sleeve. Furthermore, the elastic element applies an elastic force to the connecting part in the direction of the fixing element. By applying an elastic force to the connecting part in the direction of the fixing element, the blunt tip can extend out of the needle tube lumen under the action of the elastic element, actively protecting the distal end of the needle tube and further preventing the puncture needle from puncturing the atrium, ventricle, or coronary artery when moving within the pericardial cavity.

[0025] 4. The puncture needle provided by this invention has a limiting member fixedly installed on the connecting member corresponding to the limiting hole. The limiting member is adapted to move along the axial direction of the limiting hole through the limiting hole, or to rotate the limiting member so that the limiting member is locked on one side of the limiting hole. When the limiting member is locked on one side of the limiting hole, the elastic member is in a compressed state, and the blunt end is located in the inner cavity of the needle tube. At this time, the distal end of the puncture needle is not protected by the blunt end, and the puncture needle can normally penetrate the subcutaneous tissue. After the puncture needle penetrates the subcutaneous tissue, the limiting member is rotated to enter the limiting hole. The elastic member applies an elastic force to the connecting part in the direction of the fixing member. Since the distal end of the puncture needle is in the subcutaneous tissue, the blunt end is subjected to the pressure of the subcutaneous tissue. The pressure of the subcutaneous tissue is greater than the elastic force of the elastic member. At this time, The elastic element cannot push the blunt tip out of the needle tube lumen, meaning the puncture needle can normally puncture subcutaneous tissue and pericardium. When the puncture needle passes through the pericardium and enters the pericardial cavity, because the external pressure on the blunt tip inside the needle tube lumen is less than the elastic force of the elastic element, the elastic element applies an elastic force to the connecting part in the direction of the fixing element, which pushes the blunt tip out of the needle tube lumen. This causes the blunt tip to extend out of the needle tube lumen to protect the distal end of the needle tube, preventing the puncture needle from puncturing the atrium, ventricle, or coronary artery when moving within the pericardial cavity.

[0026] 5. The puncture needle provided by the present invention has a long strip-shaped limiting member, which makes it easy to rotate the limiting member to lock the limiting member on one side of the limiting hole, and facilitates the control of the blunt tip of the puncture needle to switch between the protection state and the puncture state.

[0027] 6. The puncture needle provided by the present invention includes a locking structure that further includes a pulling member. The pulling member is disposed at the end of the connecting member. The pulling member and the connecting member are respectively disposed on both sides of the limiting sleeve. The locking structure can be pulled by the pulling member to control the blunt tip to retract into or extend out of the needle tube cavity. At the same time, the locking structure can be limited by the pulling member to prevent the locking structure from entering the side tube cavity completely.

[0028] 7. The puncture needle provided by the present invention has a placement cavity in the inner cavity of the side tube corresponding to the blunt tip. The placement cavity is located between the fixing member and the connecting end of the side tube. The blunt tip is pulled into the placement cavity by pulling the locking structure so that other instruments can enter from the inner cavity of the needle tube and prevent the blunt tip from blocking other instruments from passing through the inner cavity of the needle tube.

[0029] 8. The puncture needle provided by the present invention has an acute angle formed by the side tube and the needle tube axially facing the proximal end. By setting the side tube and the needle tube to an acute angle, it prevents other instruments from accidentally penetrating into the inner cavity of the side tube when they are inserted from the proximal end of the needle tube, and ensures that other instruments can be smoothly inserted from the proximal end of the inner cavity of the needle tube and exited from the distal end of the inner cavity of the needle tube.

[0030] 9. The puncture needle provided by the present invention has a spring as its elastic element, which has a simple structure and is easy to install.

[0031] 10. The puncture needle provided by the present invention has a chamfered proximal end of the needle tube to facilitate the insertion of other instruments into the inner lumen of the needle tube from the proximal end. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a front view of the puncture needle provided by the present invention;

[0034] Figure 2 This is a schematic diagram of the structure of the needle tube and side tube in the puncture needle provided by the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the limiting sleeve in the puncture needle provided by the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of the limiting sleeve in the puncture needle provided by the present invention;

[0037] Figure 5 This is a schematic diagram of the locking structure in the puncture needle provided by the present invention;

[0038] Figure 6 This is a schematic diagram of the structure of the locking structure, the limiting sleeve and the elastic element in the puncture needle provided by the present invention.

[0039] Figure 7 A cross-sectional view of the puncture needle provided by the present invention in a protected state;

[0040] Figure 8 for Figure 7 Cross-sectional view of the interior of the middle side tube;

[0041] Figure 9 A cross-sectional view of the puncture needle provided by the present invention in the puncture state;

[0042] Figure 10for Figure 9 Cross-sectional view of the interior of the middle side tube.

[0043] Figure label:

[0044] 1. Needle; 101. Proximal end; 102. Distal end; 2. Lateral tube;

[0045] 3. Limiting sleeve; 301. Mounting part; 302. Limiting part; 303. Limiting hole; 304. Abutting part;

[0046] 4. Locking structure; 401. Connecting component; 402. Limiting component; 403. Pulling component;

[0047] 5. Supporting guide wire; 6. Blunt tip; 7. Elastic element; 8. Connecting part; 9. Fixing element. Detailed Implementation

[0048] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0051] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0052] The following is combined Figures 1 to 10The puncture needle of the present invention includes: a needle tube 1, a side tube 2, and a support guide wire 5. The distal end 102 of the needle tube 1 has a cutting edge, and the proximal end 101 of the needle tube 1 has a syringe interface. One end of the side tube 2 is fixedly disposed near the proximal end 101 of the needle tube 1, and the inner cavity of the side tube 2 communicates with the inner cavity of the needle tube 1. The side tube 2 and the needle tube 1 can be arranged parallel to each other or at an angle. Figure 7 and Figure 9 As shown, the support guide wire 5 is inserted into the inner cavity of the side tube 2 and the inner cavity of the needle tube 1. The support guide wire 5 is inserted from the inner cavity of the side tube 2 toward the distal end 102 of the inner cavity of the needle tube 1. A blunt tip 6 is provided at the end of the support guide wire 5 near the distal end 102. The blunt tip 6 is adapted to switch between the puncture state retracted into the inner cavity of the needle tube 1 and the protection state extended out of the inner cavity of the needle tube 1.

[0053] This puncture needle has a side tube 2 on one side of the needle tube 1. A support guide wire 5 is installed in the side tube 2 and the inner lumen of the needle tube 1. A blunt tip 6 is provided at the end of the support guide wire 5 near the distal end 102. The blunt tip 6 is controlled to extend out of and retract into the inner lumen of the needle tube 1 by controlling the support guide wire 5. When the puncture needle punctures the subcutaneous tissue, the blunt tip 6 is controlled to retract into the inner lumen of the needle tube 1, so that the puncture needle can normally puncture the subcutaneous tissue and pericardium to enter the pericardial cavity. When the puncture needle enters the pericardial cavity, the blunt tip 6 is controlled to extend out of the inner lumen of the needle tube 1, so that the blunt tip 6 covers the cutting edge of the needle tube 1. At this time, the puncture needle is protected by the blunt tip 6, which avoids direct contact between the puncture needle and the atrium, ventricle or coronary artery, and prevents the puncture needle from puncturing the atrium, ventricle or coronary artery. Meanwhile, the blunt tip 6 of the puncture needle obstructs the flow, allowing the operator to push the needle appropriately within the pericardial cavity, ensuring its stability and preventing it from puncturing the atrium, ventricle, or coronary artery as it moves within the pericardial cavity.

[0054] Specifically, such as Figure 8 and Figure 10 As shown, a fixing member 9 is fixedly installed inside the side tube 2. The fixing member 9 has a through hole for the support guide wire 5 to pass through. A connecting part 8 is provided at one end of the support guide wire 5 passing through the through hole. The support guide wire 5 can be pulled in and out of the through hole. The radial diameter of the connecting part 8 is larger than the radial diameter of the through hole, and the connecting part 8 is adapted to move within the inner cavity of the side tube 2. Figure 3 and Figure 4 As shown, it also includes a limiting sleeve 3, which includes a mounting part 301. The mounting part 301 is detachably disposed at the end of the side tube 2. For example, the mounting part 301 and the end of the side tube 2 are detachably connected by a thread, or the mounting part 301 and the end of the side tube 2 are detachably connected by a snap-fit ​​connection, etc. A limiting part 302 is coaxially disposed on the mounting part 301, and a limiting hole 303 is formed in the axial direction of the limiting part 302, such as... Figure 6As shown, a locking structure 4 is movably disposed within the limiting hole 303, and the locking structure 4 is connected to the connecting part 8. The connecting part 8 is limited by the fixing member 9 and the limiting sleeve 3, so that the connecting part 8 in the inner cavity of the side tube 2 can move between the fixing member 9 and the limiting sleeve 3, thereby restricting the movement position of the blunt tip 6 at the end of the support guide wire 5. The movement of the connecting part 8 between the fixing member 9 and the limiting sleeve 3 is controlled by controlling the locking structure 4, that is, the control of the locking structure 4 can control the blunt tip 6 to enter or exit the inner cavity of the needle tube 1.

[0055] Specifically, such as Figure 5 As shown, the locking structure 4 includes a connector 401, which can be made of steel wire, a connecting rod, etc. Figure 6 The connector 401 passes through the limiting hole 303 and connects to the connecting part 8. An elastic element 7 is coaxially sleeved on the connector 401. The elastic element 7 is located between the connecting part 8 and the limiting sleeve 3. One end of the elastic element 7 presses against the connecting part 8, and the other end of the elastic element 7 presses against the abutting part 304 of the limiting sleeve 3. Furthermore, the elastic element 7 applies an elastic force to the connecting part 8 in the direction of the fixing element 9. By applying an elastic force to the connecting part 8 in the direction of the fixing element 9 by the elastic element 7, the blunt tip 6 can extend out of the inner cavity of the needle tube 1 under the action of the elastic element 7, actively providing protection for the distal end 102 of the needle tube 1, and further preventing the puncture needle from puncturing the atrium, ventricle, or coronary artery when moving in the pericardial cavity.

[0056] Specifically, such as Figure 5 As shown, a limiting member 402 is fixedly installed on the connector 401 corresponding to the limiting hole 303. The limiting member 402 is adapted to pass through the limiting hole 303 and move along the axial direction of the limiting hole 303, or to rotate the limiting member 402 so that the limiting member 402 is locked on one side of the limiting hole 303. The limiting hole 303 can be configured to have a rectangular cross-section, and the limiting member 402 can be configured to have a rectangular cross-section. The limiting member 402 can pass through the limiting hole 303, and the cross-sectional shape of the limiting member 402 is similar to the cross-sectional shape of the limiting hole 303. When the limiting member 402 rotates, the orthographic projection of the limiting member 402 cannot fall into the limiting hole 303, and the limiting member 402 cannot pass through the limiting hole 303. At this time, the limiting member 402 is fixed on one side of the limiting hole 303. When the limiting member 402 rotates, the orthographic projection of the limiting member 402 can fall into the limiting hole 303, and the limiting member 402 can pass through the limiting hole 303.

[0057] like Figure 9 and Figure 10As shown, when the limiting member 402 is engaged on one side of the limiting hole 303, the elastic member 7 is in a compressed state, and the blunt tip 6 is located inside the needle tube 1. At this time, the distal end 102 of the puncture needle is not protected by the blunt tip 6, and the puncture needle can normally penetrate the subcutaneous tissue. After the puncture needle penetrates the subcutaneous tissue, the limiting member 402 is rotated to enter the limiting hole 303. The elastic member 7 applies an elastic force to the connecting part 8 in the direction of the fixing member 9. Since the distal end 102 of the puncture needle is in the subcutaneous tissue, the blunt tip 6 is subjected to the pressure of the subcutaneous tissue. The pressure of the subcutaneous tissue is greater than the elastic force of the elastic member 7. At this time, the elastic member 7 cannot push the blunt tip 6 out of the inner cavity of the needle tube 1, that is, the puncture needle can normally puncture the subcutaneous tissue and pericardium. Figure 7 and Figure 8 As shown, when the puncture needle passes through the pericardium and enters the pericardial cavity, since the external pressure on the blunt tip 6 inside the needle tube 1 is less than the elastic force of the elastic member 7, the elastic member 7 applies an elastic force to the connecting part 8 in the direction of the fixing member 9, which pushes the blunt tip 6 out of the needle tube 1. This causes the blunt tip 6 to extend out of the needle tube 1 to protect the distal end 102 of the needle tube 1, preventing the puncture needle from puncturing the atrium, ventricle, or coronary artery when it moves within the pericardial cavity.

[0058] Specifically, such as Figure 5 As shown, the limiting member 402 is elongated, for example, the limiting member 402 is rectangular, and the corners of the rectangle are chamfered. The limiting member 402 is set in an elongated shape so that the limiting member 402 can be rotated and locked into one side of the limiting hole 303, which facilitates the control of the blunt tip 6 of the puncture needle to switch between the protection state and the puncture state.

[0059] Specifically, such as Figure 5 As shown, the locking structure 4 also includes a pulling member 403, which is disposed at the end of the connecting member 401. The pulling member 403 and the connecting part 8 are respectively disposed on both sides of the limiting sleeve 3. The pulling member 403 can pull the locking structure 4 to control the blunt head 6 to retract into or extend out of the inner cavity of the needle tube 1. At the same time, the pulling member 403 can limit the locking structure 4 to prevent the locking structure 4 from fully entering the inner cavity of the side tube 2. Figure 5 As shown, the tension member 403 can be spherical or cylindrical.

[0060] Specifically, such as Figure 7As shown, the inner cavity of the side tube 2 has a placement cavity corresponding to the blunt tip 6. The placement cavity is located between the fixing member 9 and the connecting end of the side tube 2. By pulling the locking structure 4, the blunt tip 6 is pulled into the placement cavity to facilitate the entry of other instruments from the inner cavity of the needle tube 1 and to prevent the blunt tip 6 from blocking other instruments from passing through the inner cavity of the needle tube 1. When the puncture needle reaches the designated position in the pericardial cavity, the limiting cannula 3 can be removed from the end of the side tube 2. Then, the locking structure 4 is pulled to move the support guide wire 5 and the blunt tip 6 towards the inner cavity of the side tube 2 until the blunt tip 6 reaches the placement cavity. At this time, other instruments can be inserted from the proximal end 101 of the inner cavity of the needle tube 1. The blunt tip 6 is in the inner cavity of the side tube 2, preventing the blunt tip 6 from blocking other instruments from passing through the inner cavity of the needle tube 1.

[0061] Specifically, such as Figure 2 As shown, the angle formed by the side tube 2 and the needle tube 1 in the axial direction towards the proximal end 101 is an acute angle. By setting the side tube 2 and the needle tube 1 to an acute angle, other instruments are prevented from accidentally penetrating into the inner cavity of the side tube 2 when they are inserted from the proximal end 101 of the needle tube 1. This ensures that other instruments can be smoothly inserted from the proximal end 101 of the inner cavity of the needle tube 1 and exited from the distal end 102 of the inner cavity of the needle tube 1.

[0062] Specifically, such as Figure 6 As shown, the elastic element 7 is a spring, which has a simple structure and is easy to install.

[0063] Specifically, such as Figure 2 As shown, the proximal end 101 of the needle tube 1 is chamfered to facilitate the insertion of other instruments into the inner cavity of the needle tube 1 from the proximal end 101.

[0064] The working principle of the puncture needle in this embodiment is as follows:

[0065] Before the puncture procedure, the blunt tip 6 of the puncture needle is retracted into the inner cavity of the needle tube 1, positioning the puncture needle in the puncture state. Figure 9 and Figure 10As shown, at this time, the limiting member 402 of the locking structure 4 is engaged on one side of the limiting hole 303, the blunt tip 6 is located inside the inner cavity of the needle tube 1, the connecting part 8 and the abutting part 304 compress the elastic member 7, and the elastic member 7 applies an elastic force to the connecting part 8 in the direction of the fixing member 9. When the puncture needle is in the puncture state, the operator uses the distal end 102 of the puncture needle to penetrate the subcutaneous tissue. When the puncture needle has penetrated one end of the subcutaneous tissue, the operator rotates the limiting member 402 so that the limiting member 402 can penetrate the limiting hole 303. At this time, because the subcutaneous tissue applies pressure to the blunt tip 6 inside the inner cavity of the needle tube 1, the pressure applied by the subcutaneous tissue to the blunt tip 6 is greater than the elastic force of the elastic member 7, so the blunt tip 6 is still inside the inner cavity of the needle tube 1, and the puncture needle can continue to puncture the subcutaneous tissue and pericardium. When the distal end 102 of the puncture needle passes through the pericardium and enters the pericardial cavity, the external pressure on the blunt tip 6 decreases. At this time, the external pressure is less than the elastic force of the elastic element 7. The elastic force of the elastic element 7 drives the connecting part 8 to move towards the fixing part 9, and the limiting part 402 moves along the axial direction of the limiting hole 303, that is, it drives the support guide wire 5 to push the blunt tip 6 to move, so that the blunt tip 6 extends out of the inner cavity of the needle tube 1. At this time, the puncture needle is in a protected state. Figure 7 and Figure 8 As shown, the puncture needle is shielded by the blunt tip 6, allowing the operator to push the needle appropriately within the pericardial cavity, ensuring its stability and preventing it from puncturing the atrium, ventricle, or coronary artery while moving within the pericardial cavity.

[0066] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A puncture needle characterized by, The utility model relates to a kind of needle tube and its supporting device, including: Needle tube (1), the distal end (102) of which has blade part, the proximal end (101) of the needle tube (1) is equipped with syringe interface; Side tube (2), one end is fixedly arranged on the needle tube (1) close to the proximal end (101), the inner cavity of the side tube (2) is communicated with the inner cavity of the needle tube (1) and is arranged; Supporting guide wire (5), from the inner cavity of the side tube (2) to the distal end (102) direction of the inner cavity of the needle tube (1), the end of the supporting guide wire (5) close to the distal end (102) is provided with blunt head (6);The blunt head (6) is adapted to switch between the puncture state of retracting into the inner cavity of the needle tube (1) and the protection state of extending out of the inner cavity of the needle tube (1); The inner cavity of the side tube (2) is fixedly provided with fixing part (9), the fixing part (9) is provided with through hole, the supporting guide wire (5) passes through the through hole and the end of the through hole is provided with connecting part (8), the radial diameter of the connecting part (8) is greater than the radial diameter of the through hole; It also includes limiting sleeve (3), the limiting sleeve (3) includes mounting portion (301), the mounting portion (301) is detachably arranged on the end of the side tube (2), the mounting portion (301) is coaxially provided with limiting portion (302), the limiting portion (302) is provided with limiting hole (303) in the axial direction, the locking structure (4) is movably arranged in the limiting hole (303), the locking structure (4) is connected with the connecting part (8); The locking structure (4) includes connecting piece (401), the connecting piece (401) is connected with the connecting part (8) through the limiting hole (303), the elastic member (7) is coaxially sleeved on the connecting piece (401), one end of the elastic member (7) abuts against the connecting part (8), the other end abuts against the abutting portion (304) of the limiting sleeve (3), the elastic member (7) exerts elastic force on the connecting part (8) towards the direction of the fixing part (9); The included angle formed by the side tube (2) and the needle tube (1) in the direction of the proximal end (101) is acute, and the proximal end (101) of the needle tube (1) is chamfered.

2. The puncture needle of claim 1, wherein The connecting piece (401) is fixedly provided with limiting part (402) corresponding to the limiting hole (303), the limiting part (402) is adapted to move or rotate the limiting part (402) along the axis direction of the limiting hole (303) by passing through the limiting hole (303), and the limiting part (402) is fixedly arranged on one side of the limiting hole (303).

3. The puncture needle of claim 2, wherein The limiting part (402) is in strip shape.

4. The puncture needle of claim 3, wherein The locking structure (4) further includes pulling member (403), the pulling member (403) is arranged at the end of the connecting piece (401), and the pulling member (403) and the connecting part (8) are respectively arranged on both sides of the limiting sleeve (3).

5. The puncture needle according to any one of claims 1 to 4, characterized in that The inner cavity of the side tube (2) is provided with a placing cavity corresponding to the blunt head (6), and the placing cavity is located between the fixing part (9) and the connecting end of the side tube (2).

6. The puncture needle of any one of claims 1-4, wherein, The elastic member (7) is a spring.

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