CN220360447U - Puncture instrument - Google Patents

Abstract

The utility model discloses a puncture instrument, which comprises a puncture needle and a conveying device for conveying the puncture needle, wherein a conveying channel penetrating through the proximal end and the distal end of the conveying device is arranged in the conveying device, the puncture needle is movably arranged in the conveying channel, and the puncture needle can move under the action of external force so that the distal end of the puncture needle extends out of the distal end of the conveying device; wherein, be equipped with first section of predetermineeing on the pjncture needle, be equipped with the second section of predetermineeing on the conveying passageway, the surface of first section of predetermineeing and/or the internal surface of second section of predetermineeing are equipped with the lubricating layer to reduce the frictional force that produces when the first section of predetermineeing of pjncture needle and the second section of predetermineeing of conveying passageway are buckled and are offset. The utility model discloses a puncture instrument, and aims to solve the problem that a puncture needle of the existing puncture instrument cannot smoothly enter a bent blood vessel.

Description

Puncture instrument

Technical Field

The utility model relates to the technical field of interventional medical instruments, in particular to a puncture instrument.

Background

With the increasing maturity of endovascular prostheses, more and more doctors start to challenge aortic diseases with complex anatomical forms, but using a stent graft at special lesion sites such as aortic arch, celiac artery trunk, bilateral renal arteries or superior mesenteric arteries can affect the blood supply of arterial branch vessels, and generally requires in-situ windowing operation of the stent graft in the surgical process by energy or mechanical means, so that the stent graft generates expected holes, and then the branch stents are conveyed to the holes to be butted with the stent graft. By the method, the dependence of a treatment scheme on the anatomical structure of the branch blood vessel of a human body can be overcome, the operation time is shortened, and the risk of infection is reduced. Generally, the energy windowing mode needs to ablate the stent coating by energy, and the mode has very high requirements on energy equipment. If the energy is too high, the stent coating is carbonized, and the carbonized and decomposed product can generate thrombus; if the energy is too low, the desired windowing effect cannot be achieved, and the energy emitted by the energy device can ablate the stent and burn surrounding tissues.

Compared with the energy windowing technology, the mechanical windowing technology is a relatively conservative but relatively safe windowing technology, and a mechanical puncturing instrument widely applied clinically at present is shown in fig. 1 and mainly comprises a catheter 11', a puncturing needle 12' and a driving device 13 '. The mechanical windowing process is shown in fig. 2, the covered stent 202' is placed in the lesion area 201' of the main vessel to cover the lesion tissue, at this time, the blood flow of the branch vessel 203' is blocked by the covered stent 202', the adjustable curved sheath 14' is led along the path of the branch vessel 203' until the sheath tip is close to the covered stent 202' in the operation process, the catheter 11' of the puncture device is led along the path of the adjustable curved sheath 14' until the head end of the catheter 11' slightly exceeds the head end of the adjustable curved sheath 14', the head end of the catheter 11' is regulated to be substantially perpendicular to the covered film of the covered stent 202' by the adjustable curved sheath 14', the driving device 13' is used for driving the puncture needle 12' to puncture and puncture the covered film of the covered stent 202', the guide wire 15' is led along the guide wire cavity of the puncture needle 12' from the tail end of the driving device 13', the pig tail of the guide wire 15' is placed in the covered film stent 202', and the puncture device is led along the guide wire 15' and the guide wire to the expected hole is obtained after the puncture device is led and the stent is expanded.

Although the mechanical windowing mode can easily obtain the expected holes, the prior mechanical puncturing device has the following defects:

in the clinical use process, as shown in fig. 3, when some distorted blood vessels are encountered, for example, the blood vessel 301 'is in a position similar to a right angle or even an acute angle, or for example, the blood vessel 302' is in a plurality of continuous reverse bending states, as shown in fig. 4, at this time, a bending position A 'of the blood vessel in the blood vessel can form a bending region with a smaller radius, meanwhile, a needle tube synchronously changes along with the blood vessel to generate a bending region with a smaller radius at the bending position A', in the puncture process, the driving device 13 'pushes to generate a pushing force B', the needle tube receives the pushing force to generate a larger outward extrusion force at the twisting position, so that a larger interaction force is generated between the needle tube and the blood vessel 11', and because of the problem of the structure of the needle tube, the friction coefficient between the needle tube and the blood vessel 11' is larger, a larger friction resistance is generated, so that the puncture process has poor hand feeling, and a patient cannot easily judge whether the needle tube is excessively high in resistance or is pricked on the surface of other objects by hand feeling, and whether the stent is covered by a film. Particularly in some particularly twisted blood vessels, stress can accumulate at the position of the bending part and damage the blood vessels near the turning point due to forced pushing under the condition of overlarge resistance; or a larger reverse acting force is generated, so that a larger compressive stress is generated at the C 'of the needle tube, and when the compressive stress is too large, the needle tube is concentrated in stress and crushed and dispersed at the C' of the needle tube, so that the puncture needle cannot smoothly enter.

Disclosure of Invention

Based on the above, the utility model provides a puncture instrument, which aims to solve the problem that a puncture needle of the existing puncture instrument cannot smoothly enter a bent blood vessel.

To achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a puncture instrument, which comprises a puncture needle and a conveying device for conveying the puncture needle, wherein a conveying channel penetrating through the proximal end and the distal end of the conveying device is arranged in the conveying device; the puncture needle is provided with a first preset section, the conveying channel is provided with a second preset section, and the outer surface of the first preset section and/or the inner surface of the second preset section is provided with a lubricating layer so as to reduce friction force generated when the first preset section of the puncture needle is bent and abutted against the second preset section of the conveying channel.

In one embodiment, the lubricating layer is a PTFE layer or a glycerol layer; and/or the thickness of the lubricating layer ranges from 1 μm to 0.5mm.

In one embodiment, the needle comprises a distal needle and a cannula connected to the proximal end of the needle, the cannula comprising an axially extending first portion which is a flexible tube that is bendable.

In one embodiment, the flexible tube comprises a metal braided tube or a hypotube.

In one embodiment, the first preset section is disposed on the first portion of the needle cannula, and a distal end of the first preset section is spaced from a proximal end of the needle by a distance ranging from 5mm to 30mm.

In one embodiment, the delivery device comprises a catheter and a delivery handle; the conveying handle comprises a fixed handle and a movable handle, the distal end of the fixed handle is relatively fixed with the proximal end of the catheter, the distal end of the movable handle is sleeved at the proximal end of the fixed handle and can axially move relative to the fixed handle, and the puncture needle is arranged in the catheter, and the proximal end of the puncture needle penetrates through the fixed handle and is relatively fixed with the movable handle.

In one embodiment, the delivery device further comprises a connector, the fixed handle comprises a first horizontal section with a first aperture, a second horizontal section with a second aperture, and a reducing section in transitional connection with the first horizontal section and the second horizontal section, the second aperture is larger than the first aperture, the first horizontal section is detachably connected with the proximal end of the catheter through the connector, and the distal end of the movable handle is sleeved in the second horizontal section of the fixed handle.

In one embodiment, the needle cannula further includes a second portion extending axially and connected to the proximal end of the first portion, the second portion being a rigid tube having a hardness that is harder than the first portion.

In one embodiment, a radial limiting part is arranged in a gap formed by surrounding the fixed handle, the movable handle and the puncture needle, and the radial limiting part is used for radially restraining the needle tube.

In one embodiment, the distal outer periphery of the movable handle includes a wedge structure that mates with the sloped structure of the inner surface of the reducing section.

By arranging the lubricating layer, the puncture instrument at least reduces the layout friction force between the puncture needle and the catheter, so that the puncture needle can still smoothly move relative to the catheter in the catheter even in a bent blood vessel, and an operator can easily judge whether the puncture instrument is used for successfully puncturing a stent coating or is used for puncturing other tissues or structural members, and damage to a patient or damage other matched instruments can be timely prevented by force feedback.

Drawings

FIG. 1 is a schematic view of a prior art lancing apparatus;

FIG. 2 is a schematic illustration of a surgical procedure performed with a prior art lancing apparatus;

FIG. 3 is a schematic illustration of a tortuous vessel;

FIG. 4 is a schematic view of a prior art lancing device entering a tortuous vessel;

FIG. 5 is a schematic illustration of an exemplary lancing apparatus of the present utility model having a lubricant layer added to a first predetermined segment surface of a needle cannula of a lancet;

FIG. 6 is a partial schematic view of the lubricant layer spaced from the needle tip as it is added to the surface of the first predetermined section of the needle cannula of the lancet;

FIG. 7 is a partial schematic view of a surgical procedure for performing a procedure using an exemplary lancing apparatus according to the present utility model;

FIG. 8 is a partial schematic view of a catheter during a procedure using an exemplary lancing apparatus according to the present utility model;

FIG. 9 is a schematic illustration of an exemplary lancing apparatus according to the present utility model having a lubrication layer added to the inner surface of a second predetermined segment of a catheter;

FIG. 10 is a schematic illustration of an exemplary lancing apparatus incorporating a radial stop according to the present utility model;

FIG. 11 is a schematic illustration of the layout of the distal end of the movable handle of an exemplary lancing apparatus according to the present utility model with a beveled structure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

In addition, in the present utility model, the end of the medical device implanted in the human or animal body or the conveyor conveying the medical device, which is closer to the operator, is defined as the "proximal end", the end farther from the operator is defined as the "distal end", and the "proximal end" and the "distal end" of any member of the medical device or the conveyor are defined according to this principle. "axial" refers to the longitudinal direction of the medical device when delivered, and "radial" refers to the direction of the medical device perpendicular to its "axial" direction, and defines the "axial" and "radial" directions of any component of the medical device in accordance with this principle.

In general, referring to fig. 5 and 8, the present utility model provides a puncture instrument 100 comprising a puncture needle 10 and a delivery device 20 for delivering the puncture needle 10, wherein the delivery device 20 is provided with a delivery channel 20a penetrating a proximal end and a distal end thereof, the puncture needle 10 is movably disposed in the delivery channel 20a, and the puncture needle 10 is movable under an external force such that the distal end of the puncture needle 10 protrudes out of the distal end of the delivery device 20. Wherein, the puncture needle 10 is provided with a first preset section Y1, the conveying channel 20a is provided with a second preset section Y2, the first preset section Y1 and the second preset section Y2 can be propped against each other at the bending position to generate acting force, the outer surface of the first preset section Y1 and/or the inner surface of the second preset section Y2 is provided with a lubricating layer 30, the surface friction degree of the lubricating layer 30 is smaller than that of the first preset section Y1 on the needle tube 12 when the lubricating layer 30 is not arranged, and/or the surface friction degree of the lubricating layer 30 is smaller than that of the second preset section Y2 on the conveying channel 20a when the lubricating layer 30 is not arranged, and the lubricating layer 30 with smaller surface friction degree reduces the friction force of the puncture needle 10 propped against the conveying channel 20a at the bending position, namely, the friction force generated when the first preset section of the puncture needle is propped against the second preset section of the conveying channel is reduced. The first preset section Y1 and the second preset section Y2 may be a section, or may be multiple sections spaced apart or continuous, and may be specifically set as required. It should be noted that, the setting position and the setting length of the preset segment may be set according to the actual situation, and the illustration is only exemplary. For example, the setting position and length of the first preset segment Y1 on the needle tube 11 and the second preset segment Y2 on the conveying channel 20a can be determined according to the positions and the related lengths of the blood vessels of the people of different ages.

For example, the lubricating layer 30 may be a PTFE layer and/or a glycerol layer. Preferably, the thickness of the lubricating layer 30 is in the range of 1 μm to 0.5mm. When the outer surface of the first preset section Y1 and the inner surface of the second preset section Y2 are both provided with the lubricating layer, the lubricating layer provided on the outer surface of the first preset section Y1 and the lubricating layer provided on the inner surface of the second preset section Y2 may be the same or different, and may be specifically set as required. The lubricating layer 30 may be attached to the outer surface of the first preset segment Y1 and/or the inner surface of the second preset segment Y2 by coating or hot melting or the like. Preferably, since the outer surface of the puncture needle 10 is exposed before assembly after manufacture, the lubricating layer provided on the outer surface of the first preset section Y1 may be coated or heat-melted. Wherein the thickness of the coating layer attached to the outer surface of the first predetermined section Y1 of the puncture needle 10 by means of coating is preferably in the range of 1 μm to 30 μm. Since the inner surface of the conveying passage 20a of the conveying device 20 is internally provided with a lubricating layer, which is formed on the inner surface thereof by means of heat fusion, the coating difficulty is high. Preferably, the thickness of the lubricating inner liner attached to the inner surface of the second preset section Y2 of the conveying path 20a by means of hot melting is preferably in the range of 0.02mm to 0.5mm. It should be noted that the material and the attaching manner of the lubrication layer are not limited to the above-mentioned list, and all the layer structures that can be attached to the outer surface of the first preset section Y1 of the puncture needle 10 and reduce the roughness of the outer surface of the first preset section Y1 of the puncture needle 10 fall into the scope of the lubrication layer defined by the present utility model; similarly, any layer structure that can adhere to the inner surface of the second preset section Y2 of the conveying path 20a of the conveying device 20 and reduce the roughness of the inner surface of the second preset section Y2 of the conveying path 20a falls within the scope of the lubrication layer defined in the present utility model.

With continued reference to fig. 5, exemplary needle 10 includes a distal needle 11 and a barrel 12 attached to the proximal end of needle 11. The needle 10 has a guide wire passage (not shown) therein through which a guide wire passes. The needle 11 is of a hollow tubular structure, and the length range is preferably 1-10 mm, and is used for puncturing the covered stent to complete the perforation. Needle cannula 12 is used to conduct pushing force to needle 11 and needle cannula 12 includes a first portion 121, wherein first portion 121 is a flexible tube that is bendable. Preferably, the flexible tube comprises a metal braided tube of wire braided with sufficient flexibility and elongation resistance. The flexible tube also includes a metallic hypotube or a serpentine tube, etc. Preferably, the first preset segment Y1 is disposed on the first portion of the needle tube.

As shown in fig. 6, when the lubricant layer 30 is selectively provided on the needle tube 12 of the puncture needle 10, the needle tube 12 includes a first portion 121 extending in the axial direction, the distal end of the first portion 121 is connected to the proximal end of the needle head 11 of the puncture needle 10, and the first preset segment Y1 is provided on the first portion 121. Preferably, the distance L between the distal end of the first predetermined segment Y1 and the proximal end of the needle 11 is 5-30 mm. I.e. a section of the first portion 121 near the needle 11 of about 5-30 mm is free of a lubricating layer, where the resistance has little effect on the overall puncture feel, since this section of the blood vessel is generally relatively straight, by reducing the length of the lubricating layer, it is possible to prevent the lubricating layer from being directly immersed in the blood by extending beyond the distal end of the delivery device 20 or being abrasion resistant with hard structures such as the braided filaments of the stent, and to reduce the risk of the lubricating layer (especially attached by coating) releasing particles during use. Of course, the distance may be set based on the length of the needle cannula 12 extending from the catheter.

Referring to fig. 5, the delivery device 20 includes a catheter 21 and a delivery handle 22. The conveying handle 22 comprises a fixed handle 221 and a movable handle 222, the distal end of the fixed handle 221 is relatively fixed with the proximal end of the catheter 21, the distal end of the movable handle 222 is sleeved on the proximal end of the fixed handle 221 and can axially move relative to the fixed handle 221, and the puncture needle 10 is arranged in the catheter 21 and the proximal end passes through the fixed handle 221 to be relatively fixed with the movable handle 222. The fixed handle 221 is used for fixing a puncture instrument, and the movable handle 222 is used for being connected with the puncture needle 10 and driving the puncture needle 10 to reciprocate in the conveying channel 20a of the conveying device 20 under the action of external force. Preferably, the distal end of catheter 21 is tapered, and the tapered end of catheter 21 serves as a guide during access. The catheter 21 has a first passageway (not shown) therethrough for the needle 10 to be passed therethrough for receiving the needle 11 and needle cannula 12 to prevent scoring of blood vessels and other instruments. The fixed handle 221 includes a first horizontal section 221a having a first aperture, a second horizontal section 221c having a second aperture, and a variable diameter section 221b transitional connecting the first and second horizontal sections 221a and 221c, the second aperture being larger than the first aperture, the variable diameter section 221b having a variable diameter through hole, the through holes of the first, variable diameter and second horizontal sections 221a and 221b being penetrated and penetrated by the puncture needle 10. It will be appreciated that the through holes of the first horizontal segment 221a, the variable diameter segment 221b, and the second horizontal segment 221c, and the first passage of the conduit 21, together constitute the delivery passage 20a of the delivery device.

To facilitate assembly of the lancing apparatus, the distal end of the stationary handle 221 is detachably connected to the proximal end of the catheter 21. As an embodiment, as shown in fig. 5, the delivery device 20 further includes a connecting member 23, the first horizontal section 221a of the delivery handle 22 is detachably connected to the proximal end of the catheter 21 by the connecting member 23, and the distal end of the movable handle 222 is sleeved in the second horizontal section 221c of the fixed handle 221.

As one arrangement of the lubricant layer 30, as shown in fig. 5 and 6, the lubricant layer 30 is provided on the first preset section Y1 of the needle tube 12.

As shown in FIG. 5, the puncture needle 10 comprises a needle 11 at a distal end and a needle tube 12 connected to a proximal end of the needle 11, the needle tube 12 comprises a first portion 121 extending in an axial direction, the distal end of the first portion 121 is connected to the proximal end of the needle 11 of the puncture needle 10, and a first predetermined segment Y1 is provided on the first portion 121. A PTFE coating is applied to the surface of the first predetermined segment Y1 of the first portion 121, and the PTFE coating has a thickness of 1 to 30 μm. PTFE coatings can act as a lubrication medium due to its extremely low surface roughness, thereby reducing the resistance to pushing.

As shown in fig. 7, after the stent-graft 402 is released in the aortic arch 401, the stent-graft 402 covers the left subclavian branch vessel 403. The medical injector is used for injecting sterile physiological saline from the distal end of the movable handle 222 for exhausting, the catheter 21 wraps the puncture needle 10, the puncture needle 10 enters the left subclavian artery along the adjustable curved sheath 44 from the opening of the armpit artery until the head end of the catheter 21 reaches the vicinity of the covering film bracket 402, the movable handle 222 is used for driving the puncture needle 10 to puncture the covering film bracket, the guide wire 45 enters the covering film bracket 402 along the guide wire cavity in the puncture needle 10 and is positioned in the opening of the covering film bracket, the movable handle 222 is withdrawn for driving the puncture needle 10 to retract into the catheter 21, the puncture instrument is withdrawn and the position of the guide wire 45 is kept still, the opening of the covering film bracket 402 can be completed, an access path is established, the dilating balloon is placed in the opening of the covering film bracket 402 along the guide wire 45, and the opening can be completed by using the balloon to dilate the bracket covering film and obtain expected holes.

With continued reference to fig. 7, if the left subclavian branch vessel 403 is twisted as at 491, a large compressive force is generated between the needle cannula 12 and the catheter 21 at 491 due to the thrust force 492 as shown in fig. 8, but the frictional resistance can be greatly reduced due to the self-lubricating properties of the PTFE coating 31. The puncture device was actually measured to push the movable handle 222 at a speed of 2mm/s after the simulated pipe with a bending radius of 2cm was coiled for 2 circles, and the reaction force applied to the movable handle 222 was only 0.5 to 5N. In the in-vitro simulation using process, the puncture instrument enters the left subclavian branch of the aortic arch through the arm arch model to puncture the PTFE covered stent preset in the aortic arch, and the puncture covered force is only 2-7N. Under the condition of the puncture tectorial membrane force, an operator can easily judge whether the puncture instrument is used for successfully puncturing the stent tectorial membrane or is punctured on other tissues or structural members, and damage to a patient or damage to other matched instruments can be timely prevented through force feedback.

In other embodiments, the PTFE coating 31 may be replaced by a PTFE heat shrink tube, and the heat shrink tube is used instead of the coating, which also has good lubrication effect, and the manufacturing process is simpler, and the length control is easier.

In other embodiments, the PTFE coating 31 may be replaced with glycerin, which may be introduced into the human body (used in existing injection solutions), and only a few drops of glycerin may be applied in the first preset segment Y1 to achieve a good lubricant effect.

As another arrangement of the lubricating layer 30, as shown in fig. 9, the lubricating layer 30 is provided on the second preset section Y2 of the conveying path.

As shown in FIG. 9, in the present embodiment, the PTFE coating on the surface of the needle tube 12 is omitted, a layer of PTFE lining tube 32 is added on the inner surface of the catheter 21, the thickness of the PTFE lining tube 32 is 0.02-0.5 mm, the PTFE lining tube can play a role in lubrication due to the extremely low surface roughness of PTFE, the friction resistance can be greatly reduced, and the reaction force applied to the puncture instrument when the puncture instrument is pushed at a speed of 2mm/s after a simulation pipeline with a bending radius of 2cm is coiled for 2 circles is actually measured to be only 0.5-5N. In the in-vitro simulation using process, the puncture instrument enters the left subclavian branch of the aortic arch through the arm arch model to puncture the PTFE covered stent preset in the aortic arch, and the puncture covered force is only 2-7N. Under the condition of the puncture tectorial membrane force, an operator can easily judge whether the puncture instrument is used for successfully puncturing the stent tectorial membrane or is stuck on other tissues or structural members, and the damage to the patient caused by the instrument or other matched instruments can be timely prevented through force feedback, so that the health of the patient is finally influenced.

In the above-mentioned scheme of setting the lubrication layer 30, although the resistance of the bending part is greatly reduced by setting the lubrication layer, when the conveying handle of the conveying device adopts the above-mentioned reducing and sleeving manner, and meanwhile, the first part of the needle tube of the puncture needle is a flexible tube, as shown in fig. 4, since the conveying handle of the conveying device adopts the reducing and sleeving manner to connect, a larger radial gap W exists at the C ', the metal braided tube is not well restrained radially at the C ', when the needle tube generates a larger compressive stress at the C ', the stress concentration and crushing of the needle tube are easily caused at the C ', thereby causing the flexible tube to accumulate or the braided needle tube to scatter at the C ', therefore, the following embodiments further propose a more optimal scheme on the basis of setting the lubrication layer 30, thereby further ensuring that the puncture needle smoothly enters the bent blood vessel.

As shown in FIG. 5, and as one preferred embodiment, the needle cannula 12 further includes a second portion 122 extending axially and connected to the proximal end of the first portion 121, the second portion 122 being a rigid tube of a harder hardness than the first portion, such as a metal steel tube, the metal steel tube of the second portion 122 being disposed at C' throughout the needle cannula during the pushing of the needle cannula, the metal steel tube having a high strength and being completely enclosed within the catheter 21 during use, and the needle cannula 12 being free from wire breakage at the site due to stress concentrations caused by reaction forces even if the needle cannula is stuck to certain structural members. That is, the puncture needle of this embodiment has a three-stage structure, the distal needle has a hollow tubular structure with high strength, the first middle portion 121 is a hollow metal braided tube, and the second distal portion 122 is a hollow metal steel tube. The structure ensures that the puncture needle has sufficient flexibility and extensibility resistance on the one hand and higher strength on the other hand, and can form powerful pushing force and simultaneously prevent the needle tube 12 from scattering wires at the position of the conveying handle.

As a further preferred embodiment, as shown in fig. 10, a radial stopper 50 is provided in the gap W between the fixed handle 221 and the movable handle 222 and the puncture needle 10, and the radial stopper 50 is used for radially restraining the metal braided tube. Illustratively, the radial stop 50 is a stop spring (e.g., a coil spring) that is sleeved around the outer periphery of the needle. The rigidity of the limiting spring is smaller, larger reaction force can not be generated, the limiting spring can rebound automatically, the limiting spring wraps the outer surface of the needle tube to limit the outward expansion of the metal wire of the needle tube, and the damage to the instrument caused by the scattered wire of the needle tube due to stress concentration is prevented. The provision of the radial stop 50 has the advantage that the needle cannula 12 may be selected from a two-piece construction without having to provide a three-piece construction, i.e., the braided first portion extends all the way to the handle position, thereby reducing manufacturing flow and difficulty.

As a further preferred option, as shown in fig. 11, it is further defined that the distal end of the movable handle 222 includes a wedge-shaped structure that mates with the sloped structure of the inner surface of the variable diameter section 221 b. The distal end of the movable handle 222 is changed into a wedge-shaped structure, so that the wedge angle of the movable handle is consistent with the taper of the inner surface of the fixed handle 221, thereby prolonging the coating range of the movable handle 222 on the needle tube 12, playing a role in limiting the outward expansion of the metal wire of the needle tube 12, and preventing the damage to the instrument caused by the wire scattering of the needle tube 12 due to stress concentration.

By arranging the lubricating layer, the puncture instrument at least reduces the layout friction force between the puncture needle and the catheter, so that the puncture needle can still smoothly move relative to the catheter in the catheter even in a bent blood vessel, and an operator can easily judge whether the puncture instrument is used for successfully puncturing a stent coating or is used for puncturing other tissues or structural members, and damage to a patient or damage other matched instruments can be timely prevented by force feedback.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. The puncture instrument is characterized by comprising a puncture needle and a conveying device for conveying the puncture needle, wherein a conveying channel penetrating through the proximal end and the distal end of the conveying device is arranged in the conveying device, the puncture needle is movably arranged in the conveying channel, and the puncture needle can move under the action of external force so that the distal end of the puncture needle extends out of the distal end of the conveying device; the puncture needle is provided with a first preset section, the conveying channel is provided with a second preset section, and the outer surface of the first preset section and/or the inner surface of the second preset section is provided with a lubricating layer so as to reduce friction force generated when the first preset section of the puncture needle is bent and abutted against the second preset section of the conveying channel.

2. The lancing device of claim 1, wherein the lubricating layer is a PTFE layer or a glycerol layer; and/or the thickness of the lubricating layer ranges from 1 μm to 0.5mm.

3. A puncture device according to claim 1 or 2, characterized in that the puncture needle comprises a needle at the distal end and a needle cannula connected to the proximal end of the needle, the needle cannula comprising an axially extending first portion, which is a bendable flexible tube.

4. A lancing device according to claim 3, wherein said flexible tube comprises a metal braided tube or a hypotube.

5. A puncture device as set forth in claim 3, wherein said first predetermined section is provided on said first portion of said needle cannula, and wherein a distal end of said first predetermined section is located at a distance ranging from 5 to 30mm from a proximal end of said needle.

6. A lancing apparatus according to claim 3, wherein said delivery device includes a catheter and a delivery handle; the conveying handle comprises a fixed handle and a movable handle, the distal end of the fixed handle is relatively fixed with the proximal end of the catheter, the distal end of the movable handle is sleeved at the proximal end of the fixed handle and can axially move relative to the fixed handle, and the puncture needle is arranged in the catheter, and the proximal end of the puncture needle penetrates through the fixed handle and is relatively fixed with the movable handle.

7. The lancing apparatus of claim 6, wherein the delivery device further comprises a connector, the stationary handle comprises a first horizontal segment having a first aperture, a second horizontal segment having a second aperture, and a reducing segment transitional coupling the first horizontal segment and the second horizontal segment, the second aperture is larger than the first aperture, the first horizontal segment is detachably coupled to the proximal end of the catheter by the connector, and the distal end of the movable handle is nested within the second horizontal segment of the stationary handle.

8. The lancing apparatus of claim 7, wherein the needle cannula further comprises a second portion extending axially and coupled to the proximal end of the first portion, the second portion being a rigid tube having a hardness that is harder than the first portion.

9. The lancing apparatus of claim 7, wherein a radial stop is disposed in a gap defined between the fixed handle, the movable handle, and the lancet, the radial stop being configured to radially constrain the needle cannula.

10. The lancing apparatus of claim 7, wherein the distal periphery of the movable handle includes a wedge structure that mates with the sloped structure of the inner surface of the reduced section.