Puncture positioning device

Abstract

The invention provides a puncture positioning device, which relates to the technical field of puncture equipment and comprises an outer sheath tube, a puncture tip is arranged at the far end of the outer sheath tube, and a handle part is arranged at the near end of the outer sheath tube; the inner sheathing canal is sleeved with the outer sheathing canal in a sliding mode, a guide part is arranged at the far end of the inner sheathing canal, and a positioning part is arranged at the near end of the inner sheathing canal; the puncture needle is slidably arranged in the inner sheath tube in a sleeved mode, the far end of the puncture needle is provided with a deflection contact part, and the near end of the puncture needle is connected with an operation handle; wherein the guide part of the inner sheath tube is exposed out of the outer sheath tube when the positioning part and the handle part are axially clamped, the guide part comprises a guide surface and a puncture opening, and the deflection contact part of the puncture needle is configured to deflect after being in contact with the guide surface and penetrate through the puncture opening in the guide part to puncture target tissue. When the puncture needle directly punctures and cannot reach an expected puncture part, lateral puncture can be realized by utilizing deflection of the puncture needle to reach the expected puncture part, so that the pain of a patient is reduced, and the operation accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of puncture devices, and in particular to a puncture positioning device. Background Art

[0002] During puncture surgery operations, due to the complexity and instability of the distribution of internal tissues and other structures in the human body, as well as the uncertainty of the human body posture during puncture, the following problems are often faced during puncture operations: the puncture needle cannot reach the desired puncture site. Typically, in lung puncture, due to rib obstruction and the patient's lateral lying posture, it is not always possible to find a suitable angle to directly insert the puncture needle into the target position during puncture surgery.

[0003] At this time, the current practice is to insert the puncture needle into the human body for a certain distance, and then use the puncture needle to pull the tissues in the patient's body, thereby pulling the target puncture site so that the target puncture site is pulled onto the path of the puncture needle, and then re-puncture or further increase the puncture depth to reach the desired puncture site. In this process, the patient has to endure great pain, and due to the uncontrollable deflection of the tissues in the patient's body and the inability to directly observe the human tissues during the adjustment process, it is difficult to ensure the accuracy of the surgery. Summary of the Invention

[0004] The purpose of the present invention is to provide a puncture positioning device to solve the technical problem that the puncture needle in the prior art is not convenient to reach the desired puncture site.

[0005] The present invention provides a puncture positioning device, including:

[0006] An outer sheath tube, with a puncture tip provided at the distal end and a handle portion provided at the proximal end;

[0007] An inner sheath tube, slidably sleeved inside the outer sheath tube, with a guiding portion provided at the distal end and a positioning portion provided at the proximal end, and the positioning portion is positioned with the handle portion through an axial clamping and circumferential positioning mechanism;

[0008] A puncture needle, slidably sleeved inside the inner sheath tube, with a deflection contact head provided at the distal end and an operation handle connected to the proximal end;

[0009] Wherein, the guiding portion of the inner sheath tube is exposed outside the outer sheath tube when the positioning portion and the handle portion are axially clamped, and the guiding portion includes a guiding surface and a puncture opening, and the deflection contact head of the puncture needle is configured to deflect after contacting the guiding surface and penetrate through the puncture opening on the guiding portion to puncture the target tissue.

[0010] In an optional embodiment, the guiding surface is a plane.

[0011] In an optional embodiment, the angle between the guiding surface and the axis of the inner sheath tube is 30 to 60 degrees.

[0012] In an alternative embodiment, the positioning portion includes an optical recognition mark, which is configured to match with the image acquisition module of the medical navigation system and indicate the circumferential position of the positioning portion.

[0013] In an alternative embodiment, the circumferential positioning mechanism includes at least two circumferentially distributed first positioning members provided on the handle portion and a second positioning member provided on the positioning portion, and the first positioning member and the second positioning member can cooperate with each other to achieve circumferential locking.

[0014] In an alternative embodiment, the first positioning member is a groove, and the second positioning member is a protrusion. The second positioning member can penetrate into the first positioning member to achieve circumferential locking.

[0015] In an alternative embodiment, a sampling portion is provided on the deflection contact head of the puncture needle, and the opening direction of the sampling portion is the same as the direction of the puncture opening of the guiding portion.

[0016] In an alternative embodiment, a circumferential limiting mechanism is provided between the puncture needle and the inner sheath tube. The circumferential limiting mechanism includes a first limiting member located at the positioning portion and a second limiting member located at the operating handle, and the first limiting member and the second limiting member can cooperate with each other to achieve circumferential locking.

[0017] In an alternative embodiment, the first limiting member is a protrusion, and the second limiting member is a groove. The first limiting member can penetrate into the second limiting member to achieve circumferential locking.

[0018] In an alternative embodiment, the deflection contact head of the puncture needle is made of flexible nitinol alloy.

[0019] The puncture positioning device provided by the present invention has the following beneficial effects:

[0020] 1. The present invention adopts a three-layer structure of an outer sheath tube, an inner sheath tube and a puncture needle. Among them, the guiding surface of the inner sheath tube can deflect the deflection contact head of the puncture needle, so as to realize lateral puncture from the puncture opening of the guiding portion. Compared with the prior art in which the puncture needle can only directly puncture along the axial direction, the present invention can use the deflection of the puncture needle to achieve lateral puncture to reach the desired puncture site when the puncture needle cannot directly puncture to the desired puncture site, thus avoiding the operation of pulling the patient's internal tissues with the puncture needle, reducing the patient's pain and improving the accuracy of the operation.

[0021] 2. An axial clamping connection is provided between the outer sheath tube and the inner sheath tube, which can accurately control the length of the part of the guiding portion exposed outside the outer sheath tube; the circumferential positioning mechanism is convenient for accurately controlling the direction of the guiding portion, so as to accurately guide the lateral puncture orientation of the deflection contact head of the puncture needle and make the puncture needle accurately reach the desired puncture site. Description of the Drawings

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are 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.

[0023] Figure 1 It is a schematic diagram of the overall structure of the puncture positioning device provided by an embodiment of the present invention;

[0024] Figure 2 It is a three-dimensional schematic diagram of a partial structure at the distal end of the puncture positioning device provided by an embodiment of the present invention;

[0025] Figure 3 It is a side schematic diagram of a partial structure at the proximal end of the puncture positioning device provided by an embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of a partial structure at the distal end of the puncture positioning device provided by an embodiment of the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the circumferential limiting mechanism of the puncture positioning device provided by an embodiment of the present invention;

[0028] Figure 6 It is a schematic diagram of the structure of the circumferential positioning mechanism of the puncture positioning device provided by an embodiment of the present invention;

[0029] Figure 7 It is a schematic diagram of the structure of the inner sheath tube of the puncture positioning device provided by an embodiment of the present invention;

[0030] Figure 8 It is a schematic diagram of the structure of the distal end of the puncture positioning device in the puncture state provided by an embodiment of the present invention.

[0031] Icon: 100 - outer sheath tube; 110 - handle part; 111 - first positioning member; 200 - inner sheath tube; 210 - guiding part; 211 - guiding surface; 212 - puncture opening; 220 - positioning part; 221 - second positioning member; 222 - first limiting member; 300 - puncture needle; 310 - deflecting contact head; 320 - operating handle; 321 - second limiting member. Specific Embodiments

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention generally described and illustrated in the figures herein can be arranged and designed in a variety of different configurations.

[0033] Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of the present invention.

[0034] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

[0035] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0036] In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0037] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "installed", "connected", "connected to" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. 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 circumstances.

[0038] In the present invention, the distal end refers to the end close to the human body and far from the operator, and the proximal end refers to the end far from the human body and close to the operator.

[0039] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0040] An embodiment of the present invention provides a puncture positioning device, as Figures 1 to 8 shown, including: an outer sheath tube 100, a puncture tip 120 is provided at the distal end of the outer sheath tube 100, and a handle portion 110 is provided at the proximal end; an inner sheath tube 200, the inner sheath tube 200 is slidably sleeved inside the outer sheath tube 100, a guiding portion 210 is provided at the distal end of the inner sheath tube 200, and a positioning portion 220 is provided at the proximal end. The positioning portion 220 and the handle portion 110 are positioned through an axial clamping and circumferential positioning mechanism; a puncture needle 300, the puncture needle 300 is slidably sleeved inside the inner sheath tube 200, a deflecting contact head 310 is provided at the distal end of the puncture needle 300, and an operation handle 320 is connected to the proximal end; wherein, the guiding portion 210 of the inner sheath tube 200 is exposed outside the outer sheath tube 100 when the positioning portion 220 and the handle portion 110 are axially clamped. The guiding portion 210 includes a guiding surface 211 and a puncture opening 212. The deflecting contact head 310 of the puncture needle 300 is configured to deflect after contacting the guiding surface 211 and penetrate through the puncture opening 212 on the guiding portion 210 to puncture the target tissue.

[0041] Wherein, Figure 1 is a schematic diagram of the overall structure of the puncture positioning device provided by the embodiment of the present invention. In Figure 1 , the positioning portion 220 and the handle portion 110 are already in an axially clamped state, and the guiding portion 210 of the inner sheath tube 200 is already exposed outside the outer sheath tube 100. Figure 2 is a three-dimensional schematic diagram of a partial structure of the distal end of the puncture positioning device provided by the embodiment of the present invention. Figure 3 is a side schematic diagram of a partial structure of the proximal end of the puncture positioning device provided by the embodiment of the present invention, further showing the state and structure of the guiding portion 210 of the inner sheath tube 200 exposed outside the outer sheath tube 100. Figure 4 is a partial structure schematic diagram of the distal end of the puncture positioning device provided by the embodiment of the present invention, showing the handle portion 110, the positioning portion 220 and the operation handle 320. Figure 5 is a schematic diagram of the structure of the circumferential limiting mechanism of the puncture positioning device provided by the embodiment of the present invention. Figure 5 In, some partial structures such as the handle portion 110 of the outer sheath tube 100 are hidden. Figure 6 is a schematic diagram of the structure of the circumferential positioning mechanism of the puncture positioning device provided by the embodiment of the present invention. Figure 6 In, some partial structures such as the operation handle 320 of the puncture needle 300 are hidden. Figure 7Schematic diagram of the inner sheath tube 200 of the puncture positioning device provided by the embodiment of the present invention, Figure 7 Part of the length of the inner sheath tube 200 is hidden. Figure 8 Schematic diagram of the distal end of the puncture positioning device provided by the embodiment of the present invention in the puncture state, further showing the state where the deflection contact head 310 of the puncture needle 300 is deflected under the action of the guiding part 210.

[0042] The puncture positioning device provided in this embodiment adopts a three-layer structure of an outer sheath tube 100, an inner sheath tube 200, and a puncture needle 300. Among them, the guiding surface 211 of the inner sheath tube 200 can deflect the deflection contact head 310 of the puncture needle 300, so as to achieve lateral puncture from the puncture opening 212 of the guiding part 210. Compared with the technical solution in the prior art where the puncture needle 300 can only directly puncture along the axis, the present invention can use the deflection of the puncture needle 300 to achieve lateral puncture to reach the desired puncture site when the puncture needle 300 cannot directly reach the desired puncture site by direct puncture, thereby avoiding the operation of using the puncture needle 300 to pull the tissues in the patient's body, reducing the pain of the patient, and improving the accuracy of the operation.

[0043] The application scenario of the puncture positioning device in this embodiment is that the desired puncture site cannot be reached by the direct puncture of the conventional puncture needle 300. For example, during lung puncture, the patient is generally in a lateral lying position. Due to the obstruction of the ribs in the lungs, the desired puncture site cannot be directly reached by the conventional puncture needle 300. At this time, the current method is to insert the puncture needle 300 into the human body for a certain distance, and then use the puncture needle 300 to pull the tissues in the patient's body, so as to pull the target puncture site to the path of the puncture needle 300, and then re-puncture or further increase the puncture depth, so as to reach the desired puncture site. In this process, the patient has to bear great pain, and due to the uncontrollable deflection of the tissues in the patient's body and the inability to directly observe the human tissues during the adjustment process, it is difficult to ensure the accuracy of the operation.

[0044] In this case, the puncture positioning device provided in this embodiment can first perform puncture. The outer sheath tube 100 wraps the inner sheath tube 200 and the puncture needle 300 to reach an intermediate position first. Then, the position of the outer sheath tube 100 is fixed, and the puncture handle is further operated to make the puncture needle 300 continue to move distally within the inner sheath tube 200. After the deflection contact head 310 of the puncture needle 300 contacts the guiding surface 211 and continues to move distally, the guiding surface 211 deflects the deflection contact head 310. The puncture needle 300 continues to move distally, and the deflection contact head 310 penetrates out of the puncture opening 212 of the inner sheath tube 200, and the puncture needle 300 realizes lateral puncture, and then can reach the target position that the general puncture needle 300 cannot reach.

[0045] An axial clamping connection is provided between the outer sheath tube 100 and the inner sheath tube 200, which can accurately control the length of the part of the guiding portion 210 exposed to the outer sheath tube 100; the circumferential positioning mechanism facilitates accurately controlling the direction of the guiding portion 210, thereby accurately guiding the lateral puncture orientation of the deflection contact head 310 of the puncture needle 300, so that the puncture needle 300 can accurately reach the desired puncture site.

[0046] In some embodiments, the guiding surface 211 is a plane, such as Figure 2 , Figure 3 , Figure 7 and Figure 8 shown. The guiding surface 211 in the form of a plane can more accurately guide the deflection amplitude or deformation amplitude of the deflection contact head 310 of the puncture needle 300. In particular, it can avoid the deflection contact head 310 of the puncture needle 300 from curling or even forming a barbed shape, ensuring that the deflection contact head 310 of the puncture needle 300 will not undergo an excessive deformation when deflecting, and ensuring that the puncture needle 300 can return to the inner sheath tube 200 and the outer sheath tube 100 after the puncture is completed and then be removed from the patient's body.

[0047] In some other embodiments, the guiding surface 211 can also be set in the shape of a curved surface or an arc surface, etc.

[0048] In some embodiments, as Figure 3 shown, the angle between the guiding surface 211 and the axis of the inner sheath tube 200 is 30 to 60 degrees. More specifically, it can be 30 degrees, 45 degrees, and 60 degrees. If the angle is too small, it is likely to result in insufficient deflection amplitude of the puncture needle 300, and further lead to insufficient lateral movement distance of the deflection contact head 310 of the puncture needle 300, making it difficult to reach the target position; if the angle is too large, it is likely to result in excessive resistance, and the guiding portion 210 cannot stably guide the puncture needle 300 to deflect, resulting in the deformation failure of the puncture needle 300.

[0049] In some other embodiments, the angle between the guiding surface 211 and the axis of the inner sheath tube 200 can also be less than 30 degrees or greater than 60 degrees, and the deflection of the deflection contact head 310 of the puncture needle 300 can be completed according to the specific application scenario or the material of the specific puncture needle 300.

[0050] In some embodiments, the positioning portion 220 includes an optical recognition mark, which is configured to match with the image acquisition module of the medical navigation system and indicate the circumferential position of the positioning portion 220. Medical navigation devices are currently widely used. A medical navigation device includes an image acquisition module, such as an infrared camera, etc., which can acquire specific image elements to assist in performing surgeries. When the positioning portion 220 includes an optical recognition mark, the medical navigation device can directly acquire the circumferential position of the positioning portion 220. The operator can accurately obtain the circumferential position of the positioning portion 220 according to the information provided by the medical navigation device. The circumferential position of the positioning portion 220 also affects the circumferential position of the puncture opening 212 of the guiding portion 210. The operator can thereby accurately control the deflection direction of the deflection contact portion 310 of the puncture needle 300.

[0051] For example, the medical navigation device can include AR glasses, VR glasses, etc. The optical recognition mark can include a reflective film that can reflect infrared light to be observed by the infrared camera of the medical navigation device. The optical recognition mark can be in the shape of vertical stripes, triangles, notched rings, etc. These examples are only for assisting understanding and do not constitute specific limitations of the present invention.

[0052] In some embodiments, such as Figure 6 As shown, the circumferential positioning mechanism includes at least two first positioning members 111 circumferentially distributed on the handle portion 110 and a second positioning member 221 provided on the positioning portion 220. The first positioning member 111 and the second positioning member 221 can cooperate with each other to achieve circumferential locking. Specifically, the first positioning member 111 is a groove, and the second positioning member 221 is a protrusion. The second positioning member 221 can penetrate into the first positioning member 111 to achieve circumferential locking. In these embodiments, axial clamping can also be achieved between the handle portion 110 and the positioning portion 220 through the groove and the protrusion; in other embodiments, the handle portion 110 and the positioning portion 220 can achieve axial clamping through other end face structures.

[0053] There are at least two first positioning members 111 to achieve positioning at multiple angles. Specifically, it can be set to four, six, eight, etc. The multiple first positioning members 111 can also be arranged to be evenly distributed circumferentially, which is more convenient for adjusting the angle.

[0054] In other embodiments, the first positioning member 111 and the second positioning member 221 can also adopt other forms. For example, the first positioning member 111 is a protrusion and the second positioning member 221 is a groove. The circumferential positioning mechanism can also adopt other mechanisms, such as a ratchet.

[0055] In some embodiments, the deflection contact head 310 of the puncture needle 300 is provided with a sampling part. The opening direction of the sampling part is consistent with the direction of the puncture opening 212 of the guiding part 210. When the deflection contact head 310 penetrates out of the puncture opening 212 of the guiding part 210, the sampling part also penetrates out accordingly. Since the opening direction of the sampling part is consistent with the direction of the puncture opening 212 of the guiding part 210, the sampling part can accurately sample, and when the sampling part returns to the inner sheath 200, the sample in the sampling part will not fall off and will not be interfered by the guiding surface 211, and the sampling can be successfully completed. Specifically, the sampling part can be a groove.

[0056] In some embodiments, as Figure 5 shown, a circumferential limiting mechanism is provided between the puncture needle 300 and the inner sheath 200. The circumferential limiting mechanism includes a first limiting member 222 located at the positioning part 220 and a second limiting member 321 located at the operating handle 320. The first limiting member 222 and the second limiting member 321 can cooperate with each other to achieve circumferential locking. Specifically, the first limiting member 222 is a convex block, and the second limiting member 321 is a groove. The first limiting member 222 can penetrate into the second limiting member 321 to achieve circumferential locking.

[0057] The direction of the sampling part only needs to be kept consistent with the direction of the puncture opening 212 of the guiding part 210. The deflection direction of the deflection contact head 310 of the puncture needle 300 is limited by the guiding surface 211 and the puncture opening 212 of the guiding part 210. Therefore, by setting the circumferential limiting mechanism to achieve circumferential locking, the direction locking between the sampling part and the puncture opening 212 of the guiding part 210 can be realized, ensuring that the opening direction of the sampling part is consistent with the direction of the puncture opening 212 of the guiding part 210. The circumferential limiting mechanism can also prevent the sample from falling off due to the rotation of the puncture needle 300 during sampling.

[0058] In some embodiments, the second positioning member 221 of the circumferential positioning mechanism and the first limiting member 222 of the circumferential limiting mechanism can be an integral structure. For example, the upper and lower ends of a convex block located on the positioning part respectively form the first limiting member 222 and the second positioning member 221.

[0059] In some embodiments, the deflection contact head 310 of the puncture needle 300 is made of flexible nickel-titanium alloy material. The nickel-titanium alloy material has good deformation and recovery effects. It can deflect under the action of the guiding surface 211 during puncture and is also easy to retract into the inner sheath 200 when withdrawn. Other parts of the puncture needle 300 can be made of flexible nickel-titanium alloy material or other materials according to needs.

[0060] The common size of the puncture needle 300 is from 0.5 mm to 1 mm, and there may also be other customized sizes.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A puncture positioning device, characterized in that, Comprising: An outer sheath tube (100), with a puncture tip (120) provided at the distal end of the outer sheath tube (100) and a handle portion (110) provided at the proximal end; An inner sheath tube (200), which is slidably sleeved inside the outer sheath tube (100). A guiding portion (210) is provided at the distal end of the inner sheath tube (200), and a positioning portion (220) is provided at the proximal end. The positioning portion (220) and the handle portion (110) are positioned through an axial clamping and circumferential positioning mechanism; A puncture needle (300), which is slidably sleeved inside the inner sheath tube (200). A deflecting contact head (310) is provided at the distal end of the puncture needle (300), and an operating handle (320) is connected to the proximal end; Wherein, the guiding portion (210) of the inner sheath tube (200) is exposed outside the outer sheath tube (100) when the positioning portion (220) and the handle portion (110) are axially clamped. The guiding portion (210) includes a guiding surface (211) and a puncture opening (212). The deflecting contact head (310) of the puncture needle (300) is configured to deflect after contacting the guiding surface (211) and penetrate through the puncture opening (212) on the guiding portion (210) to puncture the target tissue.

2. The puncture positioning device according to claim 1, wherein The guiding surface (211) is a plane.

3. The puncture positioning device according to claim 2, characterized in that, The angle between the guiding surface (211) and the axis of the inner sheath tube (200) is 30 to 60 degrees.

4. The puncture positioning device according to claim 1, characterized in that, The positioning portion (220) includes an optical recognition mark, which is configured to match with the image acquisition module of the medical navigation system and indicate the circumferential position of the positioning portion (220).

5. The puncture positioning device according to claim 1, characterized in that, The circumferential positioning mechanism includes at least two circumferentially distributed first positioning members (111) provided on the handle portion (110) and a second positioning member (221) provided on the positioning portion (220). The first positioning member (111) and the second positioning member (221) can cooperate with each other to achieve circumferential locking.

6. The puncture positioning device according to claim 5, characterized in that, The first positioning member (111) is a groove, and the second positioning member (221) is a convex block. The second positioning member (221) can penetrate into the first positioning member (111) to achieve circumferential locking.

7. The puncture positioning device according to claim 1, characterized in that The deflecting contact head (310) of the puncture needle (300) is provided with a sampling portion, and the opening direction of the sampling portion is consistent with the direction of the puncture opening (212) of the guiding portion (210).

8. The puncture positioning device according to claim 7, characterized in that, A circumferential limiting mechanism is provided between the puncture needle (300) and the inner sheath tube (200). The circumferential limiting mechanism includes a first limiting member (222) located at the positioning portion (220) and a second limiting member (321) located at the operating handle (320). The first limiting member (222) and the second limiting member (321) can cooperate with each other to achieve circumferential locking.

9. The puncture positioning device according to claim 8, wherein The first limiting member (222) is a convex block, and the second limiting member (321) is a groove. The first limiting member (222) can penetrate into the second limiting member (321) to achieve circumferential locking.

10. The puncture positioning device according to claim 1, characterized in that, The deflection contact head (310) of the puncture needle (300) is made of flexible nitinol alloy.

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