Atrial septum puncture needle sheath system

Abstract

The invention provides an atrial septum puncture needle sheath system, relates to the technical field of medical devices, and aims to solve the problem that in the prior art, no hand feeling feedback is given to an operator when an oval foramen is punctured and broken through. The interatrial septum puncture needle sheath system comprises a dilator outer tube, a handle shell, an inner needle assembly, a pushing mechanism and a pull rod, the pushing mechanism and the pull rod are installed in the handle shell, the dilator outer tube is connected to the front end of the handle shell, the rear end of the inner needle assembly is arranged in the handle shell, and the front end of the inner needle assembly extends into the dilator outer tube; the rear end of the inner needle assembly is movably connected with the front end of the pull rod through a first elastic piece, and when the front end of the inner needle assembly punctures a to-be-punctured part, the first elastic piece pushes the inner needle assembly to move towards the front end of the inner needle assembly relative to the pull rod and triggers a feedback mechanism. According to the atrial septum puncture needle sheath system, a feedback mechanism can be triggered when the to-be-punctured part is punctured, so that an operator perceives that the to-be-punctured part is punctured by the inner needle assembly, further propulsion is avoided, and the operation safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an atrial septum puncture needle sheath system. Background Art

[0002] Atrial septum puncture has become one of the most commonly used techniques in interventional cardiology, and is used for the treatment of left heart system arrhythmias, left atrial appendage closure, percutaneous left ventricular assist device implantation, and various mitral valve lesion surgeries. The atrial septum puncture needle plays a role in penetrating the atrial septum during atrial septum puncture. The early atrial septum puncture was founded by Ross. The key point is to send the puncture sheath and dilator along the guide wire into the superior vena cava. When the atrial septum puncture needle is sent to 1 cm away from the opening at the distal end of the dilator, while slowly withdrawing the puncture sheath from the superior vena cava downward, rotate it clockwise to point to the left posterior lower direction, which is the 4-5 o'clock direction when viewed from bottom to top. When continuing to slowly withdraw, the distal end of the puncture sheath moves past the bulge of the aortic root and moves to the right to overlap with the spine shadow. Then withdraw the puncture sheath further so that its distal end slides into the fossa ovalis. During the process of observing the withdrawal of the puncture sheath under the cooperation of X-ray, three jumping signs can be seen. Finally, push the puncture needle to penetrate into the left atrium. The needle is slowly advanced from the tip of the component into the septum, and the operator can sense the breakthrough feeling of penetrating through the septum into the left atrium. In recent years, with the rapid development of catheter ablation for atrial fibrillation, the technical requirements for atrial septum puncture have become higher and higher. It is required that the operator can not only puncture through the atrial septum, but also puncture to the optimal site to improve safety and effectiveness.

[0003] Standard transseptal puncture instruments include: puncture needles, guide wires, dilators, and puncture sheaths. Currently, integrated transseptal puncture devices have emerged. As described in the patent application document of CN115919431A, the dilator and the puncture needle are combined in one instrument, and the pushing is controlled through a handle. This type of integrated design can reduce the exchange operation of the puncture needle and the dilator compared to the standard transseptal puncture combination. At the same time, a limit for the puncture needle to penetrate out of the dilator can be set in the transmission mechanism of the handle, reducing the damage to the inner wall of the atrium that may be caused by the puncture needle penetrating too far. The pushing of the puncture needle of this puncture device often adopts directly pushing the driving component along the axial direction of the handle, and the process of the driving component and the process of the puncture needle are also 1:1. Whether it is the traditional puncture method or this integrated puncture method, the actual distance that the puncture needle extends out of the dilator during the operation is basically 3-6 millimeters. Although the mechanical limit design is used to avoid the risk of penetrating too far due to excessive force, the short-distance movement is still very difficult to achieve good fine controllability for the direct manual pushing on the handle, increasing the learning curve for the operator to correctly use such instruments. A rotary pushing method has also emerged for the integrated puncture device. For example, as described in patent CN115670610A, there is a device similar to a rotary turntable on the handle, which can control the extension and retraction of the needle tip. Another related patent CN115349927A, an integrated device for cooperating with an interventional robotic arm to complete transseptal puncture, controls the movement of the puncture needle in the dilator through the axial rotation of the screw in the handle. The rotary needle insertion method design allows the user to perform more precise operations. Since the rotation of the finger is limited by a certain degree each time, for example, rotating half a circle, that is, 180 degrees can only advance 1 mm, it can well avoid the risk of excessive extension due to excessive pushing force.

[0004] However, the existing rotary integrated puncture devices still have two deficiencies: First, the rotary needle insertion system design can achieve precise operations and is very suitable for operating with a robotic arm. However, for the operator, there is a lack of tactile feedback (breaking feeling) given to the operator when the puncture breaks through the foramen ovale. Moreover, if the puncture needle extends too long out of the dilator, there is a risk of piercing the distal atrial wall. The most ideal situation for transseptal puncture operation is actually not only to limit the extension of the puncture needle, but that after the puncture breakthrough is completed, the puncture needle can be automatically retracted into the dilator, and then the operator can directly push the dilator into the left atrium. Summary of the Invention

[0005] The purpose of the present invention is to provide a transseptal puncture needle sheath system to solve the problem in the prior art of lacking tactile feedback given to the operator when the puncture breaks through the foramen ovale. The transseptal puncture needle sheath system of the present invention can trigger a feedback mechanism when piercing the part to be pierced, enabling the operator to sense that the inner needle assembly has pierced the part to be pierced and avoiding further advancement to improve the safety of the operation.

[0006] An atrial septal puncture needle sheath system provided by the present invention includes an outer dilator tube, a handle housing, an inner needle assembly, and a pushing mechanism and a pull rod installed in the handle housing. The outer dilator tube is connected to the front end of the handle housing. The rear end of the inner needle assembly is arranged in the handle housing and its front end extends into the outer dilator tube. The rear end of the inner needle assembly is movably connected to the front end of the pull rod through a first elastic member.

[0007] The pushing mechanism can drive the inner needle assembly and the pull rod to move forward to the front end of the handle housing simultaneously and make the front end of the inner needle assembly extend out of the outer dilator tube. When the front end of the inner needle assembly abuts against the part to be punctured, the inner needle assembly moves backward relative to the pull rod and compresses the first elastic member. When the front end of the inner needle assembly punctures the part to be punctured, the first elastic member pushes the inner needle assembly to move forward relative to the pull rod and triggers a feedback mechanism.

[0008] As a preferred solution of the present invention, it further includes a link mechanism. The link mechanism is installed at the front end of the pull rod. The link mechanism can make the pushing mechanism and the pull rod in a locked state or an unlocked state. When the link mechanism and the pull rod are in a locked state, the pushing mechanism can drive the pull rod to move. When the pushing mechanism and the pull rod are in an unlocked state, the pull rod can move relative to the pushing mechanism.

[0009] As a preferred solution of the present invention, the inner needle assembly includes an inner needle and a push rod. The push rod is fixedly connected to the outside of the inner needle. The front end of the inner needle extends into the outer dilator tube. The push rod is installed in the handle housing. An installation groove is provided at the front end of the pull rod. The rear end of the push rod extends into the installation groove. The first elastic member is installed in the installation groove and one end of it abuts against the push rod and the other end abuts against the pull rod. The rear end of the pull rod extends to the outside of the handle housing.

[0010] As a preferred solution of the present invention, a sliding groove is provided inside the installation groove of the pull rod. A sliding block is provided on the side wall of the push rod. The sliding block is slidably arranged in the sliding groove along the axial direction of the pull rod. The link mechanism is installed on one side of the sliding groove. The movement of the sliding block in the sliding groove can drive the link mechanism to make the pushing mechanism and the pull rod in a locked state or an unlocked state.

[0011] As a preferred embodiment of the present invention, the link mechanism includes a first link, a second link and a connecting block. The first link and the second link are respectively arranged on the front and rear sides of the connecting block. The middle sections of the first link and the second link are respectively rotatably connected to the pull rod through a rotating shaft. The first end of the first link is rotatably connected to the connecting block and its second end extends towards the front end of the pull rod. The first end of the second link is rotatably connected to the connecting block and its second end extends towards the rear end of the pull rod.

[0012] As a preferred embodiment of the present invention, the pushing mechanism includes a pushing component and a connecting sleeve. The pushing component is connected to the connecting sleeve and can drive the connecting sleeve to move back and forth. The connecting sleeve is sleeved on the outside of the front end of the pull rod. An elastic limiting block is arranged in the connecting sleeve. The connecting block and the elastic limiting block can be in a locked state or an unlocked state.

[0013] As a preferred embodiment of the present invention, when the sliding block moves to the front end of the sliding groove, it can drive the second end of the first link to lift and move the connecting block towards the inner side of the push rod, so that the connecting block and the elastic limiting block are in an unlocked state.

[0014] As a preferred embodiment of the present invention, it further includes a fixing ring. The fixing ring is sleeved on the outside of the push rod and fixedly connected to the handle housing. When the push rod and the link mechanism move towards the fixing ring, the fixing ring can press the second end of the second link towards the inner side of the push rod and drive the connecting block to move towards the outer side of the push rod, so that the connecting block and the elastic limiting block are in a locked state.

[0015] As a preferred embodiment of the present invention, it further includes a second elastic member. The second elastic member is installed on the outside of the pull rod. One end of the second elastic member is connected to the tail end of the handle housing and the other end is connected to the pull rod. When the pushing mechanism and the pull rod are in an unlocked state, the second elastic member can pull the pull rod towards the tail end of the handle housing.

[0016] As a preferred embodiment of the present invention, the pushing component includes a knob and a screw rod. The knob is rotatably installed on the handle housing. The knob is coaxially connected to the screw rod through a thread. The rear end of the screw rod is connected to the connecting sleeve through a bearing. The rotation of the knob can drive the screw rod and the connecting sleeve to move back and forth along the axial direction of the handle housing.

[0017] Compared with the prior art, the present invention has the following positive effects:

[0018] The atrial septum puncture needle sheath system provided by the present invention includes an outer dilator tube, a handle housing, an inner needle assembly, and a pushing mechanism and a pull rod installed in the handle housing. The outer dilator tube is connected to the front end of the handle housing. The rear end of the inner needle assembly is arranged in the handle housing and its front end extends into the outer dilator tube. The rear end of the inner needle assembly is movably connected to the front end of the pull rod through a first elastic member. The pushing mechanism can drive the inner needle assembly and the pull rod to move forward simultaneously towards the front end of the handle housing and make the front end of the inner needle assembly extend out of the outer dilator tube. When the front end of the inner needle assembly abuts against the part to be punctured, the inner needle assembly moves towards its rear end relative to the pull rod and compresses the first elastic member. When the front end of the inner needle assembly punctures the part to be punctured, the first elastic member pushes the inner needle assembly to move towards its front end relative to the pull rod and triggers a feedback mechanism. When the atrial septum puncture needle sheath system of the present invention is in use, the pushing mechanism drives the inner needle assembly and the pull rod to move forward simultaneously towards the front end of the handle housing and make the front end of the inner needle assembly extend out of the outer dilator tube. When the front end of the inner needle assembly abuts against the part to be punctured, the inner needle assembly moves towards its rear end relative to the pull rod and compresses the first elastic member. When the front end of the inner needle assembly punctures the part to be punctured, due to the disappearance of the resistance at the front end of the inner needle assembly, the first elastic member pushes the inner needle assembly to move towards its front end relative to the pull rod and triggers a feedback mechanism. The feedback mechanism gives the operator feedback in the form of vibration or sound, enabling the operator to sense that the inner needle assembly has punctured the part to be punctured and avoiding further advancement to improve the safety of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 is a schematic structural diagram of the atrial septum puncture needle sheath system of the present invention;

[0021] Figure 2 is a schematic structural diagram of the interior of the handle housing of the present invention;

[0022] Figure 3 is an exploded view of the interior of the handle housing of the present invention;

[0023] Figure 4 is a schematic structural diagram of the interior of the atrial septum puncture needle sheath system of the present invention in the initial state;

[0024] Figure 5 is Figure 4 a partial enlarged view of A in

[0025] Figure 6State diagram of the linkage mechanism when the front end of the inner needle in the present invention abuts against the puncture site to be punctured;

[0026] Figure 7 State diagram of the linkage mechanism when the front end of the inner needle in the present invention punctures the puncture site to be punctured;

[0027] Figure 8 State diagram of the linkage mechanism when the second elastic member in the present invention pulls the pull rod and the inner needle assembly backward;

[0028] Figure 9 State diagram of the linkage mechanism when the connecting sleeve of the pushing mechanism in the present invention moves backward.

[0029] In the figure: 1. Handle housing; 2. Outer dilator tube; 3. Inner needle assembly; 31. Inner needle; 32. Push rod; 321. Slide block; 322. First collision surface; 4. Pushing mechanism; 41. Knob; 42. Screw; 43. Connecting sleeve; 431. Elastic limit block; 44. Bearing; 5. First elastic member; 6. Pull rod; 61. Installation groove; 62. Slide groove; 621. Second collision surface; 63. Limit ring; 64. Installation hole; 65. Limit plate; 66. Slide groove; 7. Second elastic member; 8. Linkage mechanism; 81. Connecting block; 82. First link; 83. Second link; 9. Fixed ring. Detailed implementation manners

[0030] In the description of the present invention, it should be noted that unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0031] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0032] The following further describes the detailed implementation manners of the present invention with reference to the drawings.

[0033] Example 1:

[0034] A transseptal puncture needle sheath system provided in this example, as Figures 1-9 shown, includes an outer dilator tube 2, a handle housing 1, an inner needle assembly 3, and a pushing mechanism 4 and a pull rod 6 installed in the handle housing 1. The outer dilator tube 2 is connected to the front end of the handle housing 1. The rear end of the inner needle assembly 3 is disposed within the handle housing 1 and its front end extends into the outer dilator tube 2. The rear end of the inner needle assembly 3 is movably connected to the front end of the pull rod 6 by a first elastic member 5. The first elastic member 5 can provide a thrust for the relative movement of the inner needle assembly 3 and the pull rod 6. The inner needle assembly 3, the pushing mechanism 4, and the pull rod 6 are coaxially disposed within the handle housing 1. The pushing mechanism 4 is detachably connected to the pull rod 6. The inner needle assembly 3 can movably pass through the internal setting of the pushing mechanism 4.

[0035] The pushing mechanism 4 can drive the inner needle assembly 3 and the pull rod 6 to move simultaneously towards the front end of the handle housing 1 and make the front end of the inner needle assembly 3 extend out of the outer dilator tube 2. When the front end of the inner needle assembly 3 abuts against the part to be punctured, the inner needle assembly 3 moves towards its rear end relative to the pull rod 6 and compresses the first elastic member 5. At this time, the thrust of the first elastic member 5 on the inner needle assembly 3 is less than the resistance of the part to be punctured to the inner needle assembly 3. Therefore, it is necessary to continue to push the inner needle assembly 3 forward through the pushing mechanism 4. When the front end of the inner needle assembly 3 punctures the part to be punctured, the first elastic member 5 pushes the inner needle assembly 3 to move towards its front end relative to the pull rod 6 and triggers a feedback mechanism. The first elastic member 5 can be a spring. The feedback mechanism can be the jitter or sound generated by the first elastic member when the inner needle assembly 3 punctures the part to be punctured, so as to feedback to the operator, enabling the operator to perceive it and avoid further advancement, thereby improving the safety of the operation.

[0036] When the transseptal puncture needle sheath system of this example is in use, the pushing mechanism 4 drives the inner needle assembly 3 and the pull rod 6 to move simultaneously towards the front end of the handle housing 1 and make the front end of the inner needle assembly 3 extend out of the outer dilator tube 2. When the front end of the inner needle assembly 3 abuts against the part to be punctured, the inner needle assembly 3 moves towards its rear end relative to the pull rod 6 and compresses the first elastic member 5. When the front end of the inner needle assembly 3 punctures the part to be punctured, due to the disappearance of the resistance at the front end of the inner needle assembly 3, the first elastic member 5 pushes the inner needle assembly 3 to move towards its front end relative to the pull rod 6 and triggers a feedback mechanism. The feedback mechanism gives the operator a feedback of vibration or sound, enabling the operator to perceive that the inner needle assembly 3 has punctured the part to be punctured, avoiding further advancement, and improving the safety of the operation.

[0037] As a preferred embodiment, the atrial septum puncture needle sheath system of this embodiment further includes a link mechanism 8. The link mechanism 8 is installed at the front end of the pull rod 6, and the link mechanism 8 can make the pushing mechanism 4 and the pull rod 6 in a locked state or an unlocked state. When the link mechanism 8 and the pull rod 6 are in a locked state, the pushing mechanism 4 can drive the pull rod 6 to move. When the pushing mechanism 4 and the pull rod 6 are in an unlocked state, the pull rod 6 can move relative to the pushing mechanism 4.

[0038] When the link mechanism 8 and the pull rod 6 are in a locked state, the pushing mechanism 4 can drive the inner needle assembly 3 and the pull rod 6 to move forward to the front end of the handle housing 1 at the same time and make the front end of the inner needle assembly 3 extend out of the dilator outer tube 2. When the pushing mechanism 4 and the pull rod 6 are in an unlocked state, the pull rod 6 can drive the inner needle assembly 3 to move backward relative to the pushing mechanism 4 to the rear end of the handle housing 1 at the same time, so as to pull back the inner needle assembly 3 in time and retract it into the dilator outer tube 2.

[0039] As a preferred embodiment, as Figure 2 shown, the inner needle assembly 3 includes an inner needle 31 and a push rod 32. The push rod 32 is fixedly connected to the outside of the inner needle 31. The front end of the inner needle 31 extends into the dilator outer tube 2, and the push rod 32 is installed in the handle housing 1. The front end of the push rod 32 is connected to the handle housing 1, and the rear end of the push rod 32 passes through the pushing mechanism 4. An installation groove 61 is provided at the front end of the pull rod 6, and the installation groove 61 extends along the axial direction of the pull rod. The rear end of the push rod 32 extends into the installation groove 61. The first elastic member 5 is installed in the installation groove 61, and one end of it abuts against the push rod 32 and the other end abuts against the pull rod 6. The rear end of the pull rod 6 extends to the outside of the handle housing 1. The installation groove 61 stably sets the first elastic member between the pull rod 6 and the push rod 32, and also provides a guiding function for the movement of the push rod 32 relative to the pull rod 6.

[0040] As a preferred embodiment, as Figure 2 and Figure 5 shown, a sliding groove 62 is provided inside the installation groove 61 of the pull rod 6. The sliding groove 62 can be provided along the inner circumference of the pull rod 6 for one week, or along both sides of the pull rod 6. A sliding block 321 is provided on the side wall of the push rod 32, which can be provided along the outer wall of the push rod 32 for one week, or along both sides of the push rod 32. The sliding block 321 is slidably arranged in the sliding groove 62 along the axial direction of the pull rod 6. The sliding groove 62 provides a guiding space for the sliding of the sliding block 321 in the axial direction of the pull rod 6. The link mechanism 8 is installed on one side of the sliding groove 62. The movement of the sliding block 321 in the sliding groove 62 can drive the link mechanism 8 to make the pushing mechanism 4 and the pull rod 6 in a locked state or an unlocked state. Specifically, as Figure 3As shown, mounting holes 64 are provided on the side wall of the pull rod 6. The mounting holes 64 communicate with the sliding grooves 62, and the linkage mechanism 8 is installed in the mounting holes 64. The sliding grooves 62 guide and limit the sliding of the sliding block 321, making the connection between the push rod 32 and the pull rod 6 more stable, and restricting the distance that the push rod 32 moves relative to the pull rod 6.

[0041] Preferably, as Figure 6 shown, a first collision surface 322 is provided on the front side wall of the sliding block 321, a second collision surface 621 is provided on the front side wall of the sliding groove 62, and corresponding metal sheets are provided on the first collision surface 322 and the second collision surface 621. When the first elastic member 5 pushes the push rod 32 forward, the sliding block 321 moves forward in the sliding groove 62 until the first collision surface 322 collides with the second collision surface 621, and the two corresponding metal sheets collide to produce a sound, thereby feeding back to the operator to remind the operator that the front end of the inner needle assembly 3 has pierced the part to be pierced.

[0042] As a preferred embodiment, as Figure 2 and Figure 5 shown, the linkage mechanism 8 includes a first connecting rod 82, a second connecting rod 83 and a connecting block 81. The first connecting rod 82 and the second connecting rod 83 are respectively arranged on the front and rear sides of the connecting block 81. The middle sections of the first connecting rod 82 and the second connecting rod 83 are respectively rotatably connected to the pull rod 6 through a rotating shaft. The first end of the first connecting rod 82 is rotatably connected to the connecting block 81 and its second end extends towards the front end of the pull rod 6. The first end of the second connecting rod 83 is rotatably connected to the connecting block 81 and its second end extends towards the rear end of the pull rod 6.

[0043] Specifically, as Figure 3 shown, the first connecting rod 82 and the second connecting rod 83 are respectively rotatably installed in the mounting holes 64 through a rotating shaft. A sliding groove 66 is provided in the middle of the mounting holes 64. The sliding groove 66 has a bottom surface. The connecting block 81 is movably arranged in the connecting groove and can move radially along the pull rod 6. The width of the sliding groove 66 is greater than the width of the mounting holes 64, so that the connecting block 81 is prevented from moving back and forth along the mounting holes. The bottom end of the connecting block 81 is connected to the bottom surface of the sliding groove 66 through a third elastic member. The connecting block 81 protrudes from the outer wall of the pull rod 6 or contracts into the pull rod 6. When the connecting block 81 protrudes from the outer wall of the pull rod 6, the third elastic member enables the connecting block 81 to maintain the state of protruding from the outer wall of the pull rod 6. A limiting plate 65 is also provided in the mounting holes 64 at the rear side of the sliding groove 66. The limiting plate 65 is arranged close to the inner wall of the mounting groove 61. The second end of the second connecting rod 83 extends to the outside of the limiting plate 65 to prevent the second end of the second connecting rod 83 from rotating into the mounting groove 61.

[0044] As Figure 5As shown, when the second end of the first link 82 is lifted, it can drive the connecting block 81 to move downward, and when the second end of the second link 83 is pressed downward, it can drive the connecting block 81 to move upward.

[0045] Preferably, as Figure 5 shown, the widths of the first ends of the first link 82 and the second link 83 are both smaller than the widths of their respective second ends, so that when the sliding block 321 slides in the sliding groove 62, it can touch the second end of the first link 82 upward, causing it to rotate and drive the connecting block 81 to move downward. The length of the second end of the second link 83 is greater than the length of the second end of the first link 82.

[0046] As a preferred embodiment, the pushing mechanism 4 includes a pushing component and a connecting sleeve 43. The pushing component is connected to the connecting sleeve 43 and can drive the connecting sleeve 43 to move back and forth. The connecting sleeve 43 has a cylindrical structure with both ends open. The connecting sleeve 43 is sleeved outside the front end of the pull rod 6. An elastic limiting block 431 is arranged in the connecting sleeve 43. The connecting block 81 and the elastic limiting block 431 can be in a locked state or an unlocked state.

[0047] As Figure 5 shown, when the connecting block 81 is stuck in front of the elastic limiting block 431, the connecting block 81 and the elastic limiting block 431 are in a locked state. When the connecting sleeve 43 moves forward, it can drive the pull rod 6 to move forward. The push rod 32 is also pushed forward by the thrust of the first elastic member 5, so that the front end of the inner needle 31 can extend out of the dilator outer tube 2. As Figure 7 shown, when the connecting block 81 moves downward to the lower side of the elastic limiting block 431, the connecting block 81 and the elastic limiting block 431 are in an unlocked state, enabling the pull rod 6 to be pulled backward relative to the connecting sleeve 43.

[0048] Specifically, the front side wall of the elastic limiting block 431 is flat and the rear side wall is arc-shaped; the front side wall of the connecting block 81 is arc-shaped and the rear side wall is flat. When the connecting block 81 is stuck in front of the elastic limiting block 431, the front side wall of the elastic limiting block 431 is clamped with the rear side wall of the connecting block 81, locking the connecting block 81 and the elastic limiting block 431. When the rear side wall of the elastic limiting block 431 is butted against the front side wall of the connecting block 81, since the elastic limiting block 431 has a certain elastic deformation ability and the connecting block 81 can move up and down, the elastic limiting block 431 and the connecting block 81 cannot be locked.

[0049] As a preferred embodiment, when the sliding block 321 moves to the front end of the sliding groove 62, it can drive the second end of the first link 82 to lift and make the connecting block 81 move toward the inner side of the push rod 32, putting the connecting block 81 and the elastic limiting block 431 in an unlocked state.

[0050] When the front end of the inner needle assembly 3 pierces the part to be pierced, the first elastic member pushes the push rod 32 forward, causing the sliding block 321 to move to the front end of the sliding groove 62, pushing the second end of the first link 82 to lift, thereby driving the connecting block 81 to move towards the inside of the push rod 32, unlocking between the connecting block 81 and the elastic limiting block 431.

[0051] As a preferred embodiment, the atrial septum puncture needle sheath system of this embodiment further includes a fixing ring 9. The fixing ring 9 is sleeved on the outside of the push rod 32 and fixedly connected to the handle housing 1. The fixing ring 9 has a cylindrical structure with openings at both ends. In the initial state, the fixing ring 9 is located behind the connecting sleeve 43, and the front end of the fixing ring 9 can extend into the rear end of the connecting sleeve 43.

[0052] When the push rod 32 and the link mechanism 8 move towards the fixing ring 9, the fixing ring 9 can press the second end of the second link 83 towards the inside of the push rod 32 and drive the connecting block 81 to move towards the outside of the push rod 32, so that the connecting block 81 and the elastic limiting block 431 are in a locked state. The second end of the second link 83 extends to the rear side of the sliding groove 62 to be able to be pressed by the fixing ring 9. The second end of the second link 83 is limited by the limiting plate 65 and will not fall into the sliding groove 62, so it is not affected by the sliding of the sliding block 3,21. Preferably, as Figure 5 shown, the front end face of the fixing ring 9 is arc-shaped to facilitate the second end of the second link 83 to slide into the inside of the fixing ring 9.

[0053] In this embodiment, by providing the fixing ring 9, the fixing ring 9 can press the second end of the second link 83 towards the inside of the push rod 32 and drive the connecting block 81 to move towards the outside of the push rod 32, so that the connecting block 81 and the elastic limiting block 431 can be in a locked state.

[0054] As a preferred embodiment, the atrial septum puncture needle sheath system of this embodiment further includes a second elastic member 7. The second elastic member 7 is installed on the outside of the pull rod 6. One end of the second elastic member 7 is connected to the tail end of the handle housing 1 and the other end is connected to the pull rod 6. When the unlocking state exists between the pushing mechanism 4 and the pull rod 6, the second elastic member 7 can pull the pull rod 6 towards the tail end of the handle housing 1. Specifically, a limiting ring 63 is provided at the tail end of the pull rod 6. The limiting ring 63 is arranged inside the handle housing 1, and the second elastic member 7 is arranged between the limiting ring 63 and the installation groove 61.

[0055] When the connecting block 81 and the elastic limiting block 431 are in an unlocked state, the connecting block 81 is not limited by the elastic limiting block 431. The pull rod 6 and the inner needle assembly can be pulled towards the tail end of the handle housing 1 under the pulling force of the second elastic member 7, so that the inner needle can be retracted into the dilator outer tube 2 in time.

[0056] As a preferred embodiment, the driving assembly includes a knob 41 and a screw rod 42. The knob 41 is rotatably mounted on the handle housing 1. The knob 41 is coaxially connected to the screw rod 42 through a thread. The rear end of the screw rod 42 is connected to the connecting sleeve 43 through a bearing 44. When the knob 41 rotates, it can drive the screw rod 42 and the connecting sleeve 43 to move back and forth along the axial direction of the handle housing 1. In the initial state, the connection block 81 and the elastic limiting block 431 are in a locked state, so as to drive the pull rod 6 and the push rod 32 to move forward simultaneously, so as to push the inner needle forward and extend it out of the dilator outer tube 2 for puncture operation.

[0057] In this embodiment, by setting the knob 41, the distance that the inner needle advances forward is regulated by controlling the rotation angle of the knob 41. Compared with the traditional method of pushing through the handle, it effectively avoids the danger of the traditional puncture or the simple push rod design that the puncture needle rushes forward quickly during the doctor's operation and pierces the inner wall of the atrium. The regulation is more accurate, can achieve good fine control, and improves safety.

[0058] When the atrial septum puncture needle sheath system of this embodiment is in use, the head end of the dilator outer tube 2 abuts against the part to be punctured.

[0059] In the initial state, as Figure 5 shown, the front end of the fixing ring 9 extends into the tail end of the connecting sleeve 43. The second end of the second connecting rod 83 is pressed inside the fixing ring 9. The connection block 81 moves outward to the outside of the pull rod under force and protrudes from the outer wall of the pull rod. At this time, the connection block 81 and the elastic limiting block 431 are in a locked state. Rotate the knob 41, and the knob 41 drives the connecting sleeve 43 to move forward through the screw rod 42. Under the limiting action of the link mechanism 8, the pull rod 6 moves forward, and the push rod 32 also moves forward under the thrust of the first elastic member 5.

[0060] When the front end of the inner needle 31 abuts against the part to be punctured, due to the resistance of the part to be punctured, the push rod 32 moves backward and compresses the first elastic member 5. As Figure 6 shown, the sliding block 321 moves to the rear side of the sliding groove 62 in the sliding groove 62. The knob 41 continues to push the pull rod 6 and the push rod 32 forward.

[0061] When the front end of the inner needle 31 pierces the part to be punctured, due to the disappearance of the resistance at the front end of the inner needle 31, the first elastic member 5 pushes the inner needle assembly 3 to move forward relative to the pull rod 6 towards its front end. The sliding block 321 moves to the front side of the sliding groove 62 in the sliding groove 62, triggering a feedback mechanism, so that the operator can feel that the puncture has broken through. The sliding block 321 touches the second end of the first connecting rod 82, causing it to rotate, driving the connection block 81 to move downward, so that the connection between the connection block 81 and the elastic limiting block 431 is unlocked. As Figure 7 shown.

[0062] Under the tensile force of the second elastic member 7, the pull rod 6 drives the inner needle assembly 3 to move backward a certain distance towards the rear end of the handle housing at the same time, so that the front end of the inner needle retracts into the outer tube 2 of the dilator. This distance can be 1-2 mm, realizing the function of automatic retraction of the inner needle after piercing through, further ensuring that the inner needle will not damage the inner wall of the atrium and improving safety. As Figure 8 shown, at this time, the second end of the second link 83 slides to the inside of the fixed ring 9, causing the connecting block 81 to move outward relative to the pull rod 6 and protrude from the outer wall of the pull rod 6.

[0063] Rotate the knob 41 in the reverse direction to drive the connecting sleeve 43 to move backward. When the rear side of the elastic limiting block 431 contacts the front side of the connecting block 81, as Figure 9 shown, due to its arc-shaped structure and the elastic action of the elastic limiting block 431, the elastic limiting block 431 can move backward beyond the connecting block 81, causing the connecting sleeve 43 to return to its initial position, as Figure 5 shown.

[0064] The above are only the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art of this technology can make several deformations and improvements without departing from the creative concept of the present invention, and all should be covered within the protection scope of the present invention.

Claims

1. An atrial septal puncture needle sheath system, characterized in that, It includes an outer cannula (2) of the dilator, a handle housing (1), an inner needle assembly (3), a pushing mechanism (4) and a pull rod (6) installed in the handle housing (1). The outer cannula (2) of the dilator is connected to the front end of the handle housing (1). The rear end of the inner needle assembly (3) is arranged in the handle housing (1) and its front end extends into the outer cannula (2) of the dilator. The rear end of the inner needle assembly (3) is movably connected to the front end of the pull rod (6) through a first elastic member (5). The pushing mechanism (4) can drive the inner needle assembly (3) and the pull rod (6) to move forward to the front end of the handle housing (1) simultaneously and make the front end of the inner needle assembly (3) extend out of the outer cannula (2) of the dilator. When the front end of the inner needle assembly (3) abuts against the puncture site to be punctured, the inner needle assembly (3) moves backward relative to the pull rod (6) and compresses the first elastic member (5). When the front end of the inner needle assembly (3) punctures the puncture site to be punctured, the first elastic member (5) pushes the inner needle assembly (3) to move forward relative to the pull rod (6) and triggers the feedback mechanism.

2. The atrial septum puncture needle sheath system according to claim 1, wherein It further includes a link mechanism (8). The link mechanism (8) is installed at the front end of the pull rod (6). The link mechanism (8) can make the pushing mechanism (4) and the pull rod (6) be in a locked state or an unlocked state. When the link mechanism (8) and the pull rod (6) are in the locked state, the pushing mechanism (4) can drive the pull rod (6) to move. When the pushing mechanism (4) and the pull rod (6) are in the unlocked state, the pull rod (6) can move relative to the pushing mechanism (4).

3. The atrial septum puncture needle sheath system according to claim 2, characterized in that, The inner needle assembly (3) includes an inner needle (31) and a push rod (32). The push rod (32) is fixedly connected to the outside of the inner needle (31). The front end of the inner needle (31) extends into the outer cannula (2) of the dilator. The push rod (32) is installed in the handle housing (1). An installation groove (61) is arranged at the front end of the pull rod (6). The rear end of the push rod (32) extends into the installation groove (61). The first elastic member (5) is installed in the installation groove (61), one end of which abuts against the push rod (32) and the other end abuts against the pull rod (6). The rear end of the pull rod (6) extends to the outside of the handle housing (1).

4. The atrial septum puncture needle sheath system according to claim 3, characterized in that, A sliding groove (62) is arranged inside the installation groove (61) of the pull rod (6). A sliding block (321) is arranged on the side wall of the push rod (32). The sliding block (321) is slidably arranged in the sliding groove (62) along the axial direction of the pull rod (6). The link mechanism (8) is installed on one side of the sliding groove (62). The movement of the sliding block (321) in the sliding groove (62) can drive the link mechanism (8) to make the pushing mechanism (4) and the pull rod (6) be in a locked state or an unlocked state.

5. The atrial septum puncture needle sheath system according to claim 4, wherein The link mechanism (8) includes a first link (82), a second link (83), and a connecting block (81). The first link (82) and the second link (83) are respectively arranged on the front and rear sides of the connecting block (81). The middle sections of the first link (82) and the second link (83) are respectively rotatably connected to the pull rod (6) through a rotating shaft. The first end of the first link (82) is rotatably connected to the connecting block (81), and its second end extends towards the front end of the pull rod (6). The first end of the second link (83) is rotatably connected to the connecting block (81), and its second end extends towards the rear end of the pull rod (6).

6. The atrial septum puncture needle sheath system according to claim 1, wherein The pushing mechanism (4) includes a pushing component and a connecting sleeve (43). The pushing component is connected to the connecting sleeve (43) and can drive the connecting sleeve (43) to move back and forth. The connecting sleeve (43) is sleeved on the outside of the front end of the pull rod (6). An elastic limiting block (431) is arranged in the connecting sleeve (43). The connecting block (81) and the elastic limiting block (431) can be in a locked state or an unlocked state.

7. The atrial septum puncture needle sheath system according to claim 5, wherein, When the sliding block (321) moves to the front end of the sliding groove (62), it can drive the second end of the first link (82) to lift and make the connecting block (81) move towards the inner side of the push rod (32), so that the connecting block (81) and the elastic limiting block (431) are in an unlocked state.

8. The atrial septum puncture needle sheath system according to claim 5, characterized in that, It further includes a fixing ring (9). The fixing ring (9) is sleeved on the outside of the push rod (32) and is fixedly connected to the handle housing (1). When the push rod (32) and the link mechanism (8) move towards the fixing ring (9), the fixing ring (9) can press the second end of the second link (83) towards the inner side of the push rod (32) and drive the connecting block (81) to move towards the outer side of the push rod (32), so that the connecting block (81) and the elastic limiting block (431) are in a locked state.

9. The atrial septum puncture needle sheath system according to claim 1, wherein It further includes a second elastic member (7). The second elastic member (7) is installed on the outside of the pull rod (6). One end of the second elastic member (7) is connected to the tail end of the handle housing (1), and the other end is connected to the pull rod (6). When the pushing mechanism (4) and the pull rod (6) are in an unlocked state, the second elastic member (7) can pull the pull rod (6) towards the tail end of the handle housing (1).

10. The atrial septum puncture needle sheath system according to claim 6, characterized in that, The pushing component includes a knob (41) and a screw rod (42). The knob (41) is rotatably installed on the handle housing (1). The knob (41) is coaxially connected to the screw rod (42) through a thread. The rear end of the screw rod (42) is connected to the connecting sleeve (43) through a bearing (44). Rotating the knob (41) can drive the screw rod (42) and the connecting sleeve (43) to move back and forth along the axial direction of the handle housing (1).

Images