Telescopic atrial septum puncture needle

Abstract

The invention discloses a telescopic interatrial septum puncture needle, and relates to the technical field of medical instruments, the telescopic interatrial septum puncture needle comprises a puncture needle body, a needle sheath, an elastic limiting connecting piece and a telescopic operating mechanism, and the needle sheath is elastically connected with the puncture needle body through the elastic limiting connecting piece; the telescopic operation mechanism is used for pushing the puncture needle body to move along the needle sheath. The puncture needle body is completely contained in the needle sheath before puncture reaches the interatrial septum position, when a cortex is punctured, the puncture needle body can be pushed to extend by a proper length through the supporting rod, the puncture needle body can conveniently penetrate through the cortex to enter a human body, and in the process, the elastic limiting connecting piece generates resilience force; when the supporting rod is withdrawn, the puncture needle can retract by means of resilience force of the elastic limiting connecting piece, so that the telescopic function is achieved, the situation that the puncture needle body damages the side wall of a human body cavity before reaching the interatrial septum position is avoided, meanwhile, the puncture needle point retracted in the needle sheath is wrapped by the tubular elastic limiting connecting piece, and the puncture needle is convenient to use. And the inner wall of the needle sheath is prevented from being damaged.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a retractable atrial septal puncture needle. Background Art

[0002] Ablation of the left atrium requires the ablation catheter to enter the left atrium. Currently, the most common method for the ablation catheter to enter the left atrium is through atrial septal puncture. Atrial septal puncture is a minimally invasive surgery performed under the guidance of imaging equipment. The puncture needle passes through the atrial septum of the heart to establish a channel connecting the left heart and the right heart. Through the channel, the therapeutic device to be implanted can be placed in the left atrium.

[0003] In the prior art, a sheath is used to carry a puncture needle into a designated position in the human body. During the process, the needle tip exposed outside the sheath first penetrates the cortex, then moves along the body to the designated position. After reaching the designated position, the puncture needle is extended outward to complete the puncture.

[0004] The shortcomings of the existing technology are: due to the complex internal structure of the human body and the individual differences in physiological and anatomical structures, coupled with the influence of different operating experience and operating levels of medical personnel, after the puncture needle enters, the puncture needle tip may cause damage to the patient's cavity wall, or damage the puncture sheath, thereby affecting the progress of the operation. Therefore, atrial septal puncture needs to ensure that the puncture needle does not hurt the human body, and at the same time, it must ensure that the puncture sheath will not be damaged during the delivery process. This is a technical problem that urgently needs to be solved in medicine. Summary of the invention

[0005] The purpose of the present invention is to provide a retractable atrial septal puncture needle to solve the technical problem in the prior art that the atrial septal puncture needle is easy to damage the wall of the human body cavity during the puncture process.

[0006] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0007] A retractable atrial septal puncture needle comprises a puncture needle body and a needle sheath, wherein the puncture needle body is slidably inserted into the needle sheath, and further comprises:

[0008] An elastic limiting connector, wherein the needle sheath and the puncture needle body are elastically connected via the elastic limiting connector;

[0009] The telescopic operating mechanism is arranged in the needle sheath and is used to push the puncture needle body to move along the needle sheath.

[0010] As a further solution of the present invention: the puncture needle body includes a hollow tube body and a puncture needle tip, the hollow tube body is slidably inserted into the needle sheath, and one end of the hollow tube body away from the needle sheath is fixedly connected to the puncture needle tip.

[0011] As a further solution of the present invention: the elastic limiting connector is a tubular structure, and one end of the elastic limiting connector is fixedly connected to the outer wall of the needle sheath, and the other end is fixedly connected to one end of the hollow tube body close to the puncture needle tip.

[0012] As a further solution of the present invention: the outer diameter of the hollow tube body is greater than the outer diameter of the puncture needle tip.

[0013] As a further solution of the present invention: a locking mechanism is provided between the hollow tube body and the needle sheath.

[0014] As a further solution of the present invention: the locking mechanism includes a convex ring member and a retaining ring member, the convex ring member is fixedly connected to one end of the hollow tube body close to the needle sheath, and the convex ring member is slidably fitted in the needle sheath, the retaining ring member is arranged at one end of the needle sheath close to the puncture needle tip, and the retaining ring member and the convex ring member are limitedly fitted.

[0015] As a further solution of the present invention: the telescopic operating mechanism includes a support rod and a support handle, the support handle is fixedly arranged at one end of the support rod, and the support handle is used to control the support rod to penetrate into the needle sheath to push the puncture needle body.

[0016] As a further solution of the present invention: a reducing end body is provided at one end of the support rod away from the support handle, and the reducing end body matches the hollow tube body.

[0017] As a further solution of the present invention: it also includes a puncture operating handle, and the end of the needle sheath away from the puncture needle body is fixedly connected to the puncture operating handle, and an engaging locking mechanism for locking the relative position of the support rod and the needle sheath is provided between the puncture operating handle and the support handle.

[0018] As a further solution of the present invention: the engagement locking mechanism includes an engagement rack, and the engagement rack is provided with two groups, and is respectively fixedly connected to the puncture operation handle and the support handle, and the two groups of engagement racks cooperate with each other.

[0019] Beneficial effects of the present invention:

[0020] 1. In the present invention, before the puncture reaches the position of the atrial septum, the puncture needle body is completely stored in the needle sheath. When puncturing the cortex, the puncture needle body can be pushed out to an appropriate length by the support rod, so as to conveniently pass through the cortex and enter the human body. During this process, the elastic limiting connector generates a rebound force. When the support rod is withdrawn, the puncture needle can be retracted by relying on the rebound force of the elastic limiting connector, thereby realizing the telescopic function, avoiding the puncture needle body from damaging the side wall of the human body cavity before reaching the position of the atrial septum. At the same time, the puncture needle tip retracted in the needle sheath is also wrapped by the tubular elastic limiting connector, which can prevent damage to the inner wall of the needle sheath.

[0021] 2. In the present invention, the puncture needle body is pushed up by the support rod to slide and retract relative to the needle sheath. During the early cortical puncture and the puncture of the designated position of the atrial septum, the elastic limiting connector arranged between the puncture needle body and the needle sheath will deform to generate a rebound force. The direction of the rebound force is opposite to the direction of the pushing force of the support rod, so that the puncture needle body advancing during the puncture process can be restricted and hindered to a certain extent by relying on the rebound force, thereby avoiding damage caused by excessive pushing force and facilitating the operator to control the puncture force. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the puncture needle body of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure in which the puncture needle tip is accommodated in the needle sheath in the present invention;

[0026] Figure 4 It is a schematic diagram of the structure when the puncture needle tip of the present invention extends out from the needle sheath;

[0027] Figure 5 It is a structural schematic diagram of the telescopic operating mechanism in the present invention;

[0028] Figure 6 It is a schematic diagram of the structure in which two groups of meshing racks are meshed with each other in the present invention.

[0029] In the figure: 1. puncture needle body; 101. puncture needle tip; 102. hollow tube body; 2. elastic limit connector; 3. needle sheath; 4. puncture operating handle; 5. telescopic operating mechanism; 501. support rod; 502. support handle; 6. bite rack; 7. locking mechanism; 701. convex ring member; 702. retaining ring member. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] like Figure 1-Figure 6As shown, a retractable atrial septal puncture needle comprises a puncture needle body 1, a needle sheath 3 and a puncture operating handle 4 for operating the puncture needle body 1. The puncture operating handle 4 is convenient for the operator to grasp the entire puncture needle for related operations. A Luer connector is provided on one side of the puncture operating handle 4 to facilitate the connection of related instruments. The puncture needle body 1 is slidably inserted into the inner side of one end of the needle sheath 3, and the puncture needle body 1 slides and retracts along the needle sheath 3.

[0032] The puncture needle also includes an elastic limiting connector 2 and a telescopic operating mechanism 5; the end of the needle sheath 3 away from the puncture needle body 1 is fixedly connected to the puncture operating handle 4, and before reaching the atrial septum puncture position, the puncture needle body 1 can be completely stored in the needle sheath 3, and then the puncture operating handle 4 drives the needle sheath 3 and the stored puncture needle body 1 to move to the atrial septum puncture position. In this process, since the puncture needle body 1 is stored in the needle sheath 3, the puncture needle body 1 is prevented from scratching the human body cavity wall, and the maximum puncture length of the puncture needle body 1 is within the safe length range;

[0033] One end of the needle sheath 3 close to the puncture needle body 1 is also elastically connected to the puncture needle body 1 through an elastic limiting connector 2. When the elastic limiting connector 2 is in a normal state, one end of the puncture needle body 1 is inserted 10 mm inside the needle sheath 3, and the other end is exposed outside the needle sheath 3. The elastic limiting connector 2 can be stretched or bent to deform. When the puncture needle body 1 is pushed out, the elastic limiting connector 2 can rely on the interaction between the rebound force and the thrust of the elastic limiting connector 2 to keep the puncture needle body 1 stable.

[0034] It should be noted that the elastic limiting connector 2 is made of high-performance materials, such as superelastic nickel-titanium alloy or medical-grade silicone, and has high elasticity, good flexibility, large recoverable deformation and biocompatibility.

[0035] The telescopic operating mechanism 5 is cooperatively arranged in the needle sheath 3 , and the telescopic operating mechanism 5 is used to push the puncture needle body 1 to move.

[0036] It should be noted that the puncture needle body 1 is initially completely received in the needle sheath 3, and the elastic limiting connector 2 is completely folded and received in the needle sheath 3 as the puncture needle body 1 is completely folded and received in the needle sheath 3 and is in a fixed state, that is, the elastic limiting connector 2 is Figure 4 The original state shown is folded into Figure 3After the state shown, the elastic limiting connector 2 is turned outward as a whole and can maintain this shape. In this state, the puncture operation is started. First, the telescopic operating mechanism 5 is used to push the puncture needle body 1 out to a proper distance, which is not enough to make the elastic limiting connector 2 fold and recover. Then, the end of the puncture needle body 1 pierces the cortex and enters the human body. In this process, the elastic limiting connector 2 is compressed and generates a rebound force due to the movement of the puncture needle body 1, which is convenient for generating a rebound resistance on the puncture needle body 1. The rebound resistance is in opposite directions to the pushing force of the telescopic operating mechanism 5, which is convenient for keeping the puncture needle body 1 moving slowly and steadily. After passing through the cortex and piercing the blood vessel, the telescopic operating mechanism 5 is withdrawn. At this time, the puncture needle body 1 relies on the rebound of the elastic limiting connector 2 The force is retracted into the needle sheath 3, and the elastic limiting connector 2 is relied on to remain stable relative to the needle sheath 3, and then the needle sheath 3 and the puncture needle body 1 stored in the needle sheath 3 are pushed to move to the specified position, and finally the puncture needle body 1 is pushed out through the telescopic operating mechanism 5, driving the elastic limiting connector 2 to recover to the outside of the needle sheath 3. During this process, the moving distance of the puncture needle body 1 is within the safe distance, and then the telescopic operating mechanism 5 is slowly pushed to make the puncture needle body 1 further extended. During this process, the elastic limiting connector 2 is stretched and generates a rebound force due to the elongation of the puncture needle body 1. The rebound force generated at this time interacts with the thrust of the telescopic operating mechanism 5, so that the puncture needle body 1 moves slowly and safely, tests the required puncture distance, and ensures that the atrial septum puncture is safer.

[0037] It should be noted that, in order to facilitate the control of the puncture distance of the puncture needle body 1, the positions of the puncture needle body 1 and the needle sheath 3 can be detected in real time in cooperation with relevant camera detection equipment.

[0038] In some specific embodiments, in order to facilitate the sliding cooperation between the puncture needle body 1 and the needle sheath 3, as shown in FIG. Figure 2 As shown, the puncture needle body 1 includes a hollow tube body 102 and a puncture needle tip 101 . The hollow tube body 102 is slidably inserted into the needle sheath 3 , and one end of the hollow tube body 102 away from the needle sheath 3 is fixedly connected to the puncture needle tip 101 .

[0039] In other specific embodiments, the elastic limiting connector 2 is a tubular structure, and the elastic limiting connector 2 is sleeved on the outside of the hollow tube body 102. One end of the elastic limiting connector 2 is fixedly connected to the outer wall of the needle sheath 3, and the other end is fixedly connected to one end of the hollow tube body 102 close to the puncture needle tip 101, so as to ensure that the puncture needle tip 101 is exposed to the outside for puncture.

[0040] In some specific embodiments, in order to avoid mutual obstruction between the elastic limiting connector 2 and the puncture needle tip 101 when the puncture needle tip 101 is retracted into the needle sheath 3, the outer diameter of the hollow tube body 102 is larger than the outer diameter of the puncture needle tip 101, so that there is a transition step between the hollow tube body 102 and the puncture needle tip 101. Since the hollow tube body 102 is inserted into the needle sheath 3, the size of the puncture needle tip 101 must be smaller than the internal size of the needle sheath 3, and there is a gap between the two. In this way, when the hollow tube body 102 is completely retracted into the needle sheath 3, there is a gap between the puncture needle tip 101 and the needle sheath 3, which facilitates the elastic limiting connector 2 to fold into the needle sheath 3 as the hollow tube body 102 moves.

[0041] In some specific embodiments, in order to prevent the puncture needle body 1 from falling off when the elastic limiting connector 2 is damaged and falls off, Figure 4 As shown, a locking mechanism 7 is provided between the hollow tube body 102 and the needle sheath 3 , and the locking mechanism 7 is used to prevent the hollow tube body 102 from being separated from the needle sheath 3 .

[0042] Among them, the locking mechanism 7 includes a convex ring part 701 and a retaining ring part 702, the convex ring part 701 is fixedly connected to one end of the hollow tube body 102 close to the needle sheath 3, and the convex ring part 701 is slidably fitted in the needle sheath 3, the retaining ring part 702 is arranged at one end of the needle sheath 3 close to the puncture needle tip 101, and the retaining ring part 702 and the convex ring part 701 are limited and matched, the hollow tube body 102 passes through the inner circle position of the retaining ring part 702 and enters the needle sheath 3, and the outer circle width of the convex ring part 701 is greater than the inner circle width of the retaining ring part 702, so that when the elastic limiting connecting part 2 is damaged and falls off, it can prevent the hollow tube body 102 from detaching from the needle sheath 3 with the puncture needle tip 101.

[0043] In some specific embodiments, in combination Figure 1 and Figure 5 As shown, the telescopic operating mechanism 5 includes a support rod 501 and a support handle 502 . The support handle 502 is fixedly arranged at one end of the support rod 501 . The support handle 502 is used to control the support rod 501 to penetrate into the needle sheath 3 to push the puncture needle body 1 .

[0044] In some specific embodiments, in order to facilitate the support rod 501 to effectively push the puncture needle body 1, a reducing end body is provided at the end of the support rod 501 away from the support handle 502, which is approximately conical in shape, and the reducing end body cooperates with the hollow tube body 102. The maximum diameter of the reducing end body is larger than the inner diameter of the hollow tube body 102, and the minimum diameter is smaller than the inner diameter of the hollow tube body 102. This makes it convenient for the reducing end body of the support rod 501 to contact the hollow tube body 102 and effectively perform a pushing effect.

[0045] In other specific embodiments, since the support rod 501 will be subject to the rebound force of the elastic limiting connector 2 during the movement of the puncture needle body 1, in order to ensure that the puncture needle body 1 can remain relatively stable after puncturing to the corresponding position, an interlocking locking mechanism is provided between the puncture operating handle 4 and the support handle 502 for locking the relative position of the support rod 501 and the needle sheath 3.

[0046] Among them, the bite locking mechanism includes a bite rack 6, which is provided with two groups and is respectively fixedly connected to the puncture operating handle 4 and the support handle 502. The bite rack 6 is evenly spaced with oblique teeth, and the two groups of bite racks 6 can cooperate with each other to bite together. The puncture operating handle 4 and the support handle 502 are both elastic rubber bodies, which can be bent and deformed by pressing. The bite rack 6 itself is also an elastic rubber body. When the support rod 501 moves along the needle sheath 3 to push the puncture needle body 1 to a suitable position and stop, in order to avoid the puncture needle body 1 from shrinking due to the rebound force of the elastic limiting connector 2, the puncture operating handle 4 and the support handle 502 can be directly pressed so that the two groups of bite racks 6 are pressed and bitten together. Figure 6 As shown, the support rod 501 is fixed relative to the needle sheath 3, so that the support rod 501 supports the puncture needle body 1 to prevent it from rebounding and shrinking.

[0047] In some specific embodiments, the support rod 501 is a solid polytetrafluoroethylene material body, which has excellent chemical stability, corrosion resistance, sealing, high lubricity and non-stickiness, electrical insulation and good anti-aging resistance, and is easy to use in the current working environment.

[0048] In order to facilitate the understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution is briefly described in combination with specific application scenarios:

[0049] Before puncture, the puncture needle body 1 is completely stored in the needle sheath 3, and the elastic limiting connector 2 is completely folded and stored in the needle sheath 3 along with the puncture needle body 1 and is in a fixed state. During this process, the tubular elastic limiting connector 2 is located between the puncture needle tip 101 and the needle sheath 3, which can effectively prevent the puncture needle tip 101 from damaging the inner wall of the needle sheath 3;

[0050] Then, the support rod 501 is driven by the support handle 502 to penetrate into the needle sheath 3 and contact the hollow tube 102 end of the puncture needle body 1, and then the support rod 501 is used to push up, so that the puncture needle tip 101 extends a proper distance, which is not enough to make the elastic limiting connector 2 fold and recover, and then rely on the exposed puncture needle body 1 to pierce the cortex and enter the human body. In this process, the elastic limiting connector 2 is compressed due to the movement of the puncture needle body 1 to generate a rebound force, which is convenient for generating a rebound resistance for the puncture needle body 1. The rebound resistance is in the opposite direction to the pushing force of the support rod 501, which is convenient for keeping the puncture needle body 1 moving slowly and steadily. After passing through the cortex and piercing the blood vessel, the support rod 501 is withdrawn. At this time, the puncture needle body 1 relies on the rebound force of the elastic limiting connector 2 to be completely retracted into the needle sheath 3, and then the needle sheath 3 and the puncture needle body 1 stored in the needle sheath 3 are pushed to move to the specified position. In this process, since the puncture needle body 1 is in a stored state, damage to the human cavity wall can be avoided;

[0051] Then, the support rod 501 is used to push the puncture needle body 1 out, driving the elastic limiting connector 2 to recover to the outside of the needle sheath 3. During this process, the moving distance of the puncture needle body 1 is within the safe distance. Then, the support rod 501 is slowly pushed to make the puncture needle body 1 further extend. During this process, the elastic limiting connector 2 is stretched and generates a rebound force due to the extension of the puncture needle body 1. The rebound force generated at this time interacts with the thrust of the support rod 501, so that the puncture needle body 1 moves forward slowly and safely, tests the required puncture distance, and ensures that the atrial septum puncture is safer.

[0052] When the support rod 501 moves along the needle sheath 3 to push the puncture needle body 1 to a suitable position, in order to prevent the puncture needle body 1 from shrinking due to the rebound force of the elastic limiting connector 2, the puncture operating handle 4 and the support handle 502 can be directly pressed so that the two sets of engaging racks 6 are pressed and engaged together, thereby fixing the position of the support rod 501 relative to the needle sheath 3. In this way, the support rod 501 supports the puncture needle body 1 to prevent it from rebounding and shrinking. After the puncture is completed, the support rod 501 is withdrawn to perform the subsequent steps of the atrial septal puncture.

[0053] Several embodiments of the present invention are described in detail above, but the embodiments of the present invention are not limited thereto and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A retractable atrial septal puncture needle, comprising a puncture needle body (1) and a needle sheath (3), wherein the puncture needle body (1) is slidably inserted into the needle sheath (3), characterized in that: Also includes: An elastic limiting connector (2), wherein the needle sheath (3) and the puncture needle body (1) are elastically connected via the elastic limiting connector (2); A telescopic operating mechanism (5) is arranged in cooperation with the needle sheath (3), and the telescopic operating mechanism (5) is used to push the puncture needle body (1) to move along the needle sheath (3).

2. The retractable atrial septal puncture needle according to claim 1, characterized in that: The puncture needle body (1) comprises a hollow tube body (102) and a puncture needle tip (101); the hollow tube body (102) is inserted into the needle sheath (3) in a sliding manner; and one end of the hollow tube body (102) away from the needle sheath (3) is fixedly connected to the puncture needle tip (101).

3. The retractable atrial septal puncture needle according to claim 2, characterized in that: The elastic limiting connector (2) is a tubular structure, and one end of the elastic limiting connector (2) is fixedly connected to the outer wall of the needle sheath (3), and the other end is fixedly connected to an end of the hollow tube body (102) close to the puncture needle tip (101).

4. The retractable atrial septal puncture needle according to claim 2, characterized in that: The outer diameter of the hollow tube body (102) is greater than the outer diameter of the puncture needle tip (101).

5. The retractable atrial septal puncture needle according to claim 2, characterized in that: A locking mechanism (7) is provided between the hollow tube body (102) and the needle sheath (3).

6. The retractable atrial septal puncture needle according to claim 5, characterized in that: The locking mechanism (7) comprises a convex ring member (701) and a retaining ring member (702); the convex ring member (701) is fixedly connected to one end of the hollow tube body (102) close to the needle sheath (3), and the convex ring member (701) is slidably fitted in the needle sheath (3); the retaining ring member (702) is arranged at one end of the needle sheath (3) close to the puncture needle tip (101), and the retaining ring member (702) and the convex ring member (701) are limitedly fitted.

7. The retractable atrial septal puncture needle according to claim 2, characterized in that: The telescopic operating mechanism (5) comprises a support rod (501) and a support handle (502), wherein the support handle (502) is fixedly arranged at one end of the support rod (501), and the support handle (502) is used to control the support rod (501) to penetrate into the needle sheath (3) to push the puncture needle body (1).

8. The retractable atrial septal puncture needle according to claim 7, characterized in that: A reducing end body is provided at one end of the support rod (501) away from the support handle (502), and the reducing end body matches the hollow tube body (102).

9. The retractable atrial septal puncture needle according to claim 7, characterized in that: It also includes a puncture operating handle (4), and one end of the needle sheath (3) away from the puncture needle body (1) is fixedly connected to the puncture operating handle (4), and an engaging locking mechanism for locking the relative position of the support rod (501) and the needle sheath (3) is provided between the puncture operating handle (4) and the support handle (502).

10. The retractable atrial septal puncture needle according to claim 9, characterized in that: The occlusal locking mechanism comprises an occlusal rack (6), wherein two groups of the occlusal rack (6) are provided and are respectively fixedly connected to the puncture operation handle (4) and the support handle (502), and the two groups of occlusal racks (6) cooperate with each other.

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