Double-end guide wire for lower limb artery CTO interventional therapy

Abstract

The utility model provides a double-end guide wire for lower limb artery CTO interventional therapy. A first guide wire head end and a second guide wire head end are arranged at the two ends of a push rod mandrel respectively. The first guide wire head end comprises a guide wire core, a metal wire, a first spring ring sheath and an outer sheath, one end of the guide wire core is connected with the push rod mandrel, the first spring ring sheath is sleeved on the guide wire core, a gap is reserved between the tail end of the first spring ring sheath and the tail end of the guide wire core, the outer sheath is arranged at the tail end of the first spring ring sheath, and the metal wire is arranged in the outer sheath. Free metal wires are arranged on the end surface of the inner side of the outer sheath; the structure of the second guide wire head end is the same as that of the first guide wire head end, or the second guide wire head end is a second spring ring protective sleeve arranged on the push rod mandrel in a sleeving mode, and the tail end of the second spring ring protective sleeve is conical. In the retrograde puncture and opening process of the artery occlusion section, the two ends of the guide wire can serve as working ends, and the operation that after the guide wire is withdrawn, the direction is turned, and a far-end blood vessel is subjected to super-selection again is avoided. The device is suitable for various vasculopathy of iliac artery, femoral popliteal artery and the like.

Description

Technical Field

[0001] The utility model relates to a surgical instrument, in particular to a double-head guide wire used for interventional treatment of CTO of lower limb arteries. Background Art

[0002] Guidewires are important tools in medical interventional procedures. In all interventional procedures, the guidewire must reach or exceed the target lesion before follow-up instruments are used for subsequent diagnosis or treatment.

[0003] At present, interventional intraluminal vascular recanalization is an important means of treating lower extremity arterial vascular occlusive lesions. Chronic total occlusion (CTO) is a common lesion of lower extremity arteriosclerosis occlusion. Due to the particularity of lower extremity anatomy, lower extremity arterial CTO lesions are usually long, up to 20-30cm, with hard lesions and often accompanied by calcification of the media or intima. The resistance of the guidewire tip through the lesion is large, often accompanied by bending and damage of the tip. In addition, in different segments of the CTO lesion, the nature of the lesion will also change, and the requirements for guidewire performance are also different. For example, the resistance of the segment with more thrombus components is small, and a guidewire with a small head hardness and good tracking performance is required; while lesions with plaques and calcification require a guidewire with a large head hardness and good pushing performance. The damage of the guidewire and the demand for different guidewire characteristics for different lesion properties make it usually take more than 2-3 guidewires to open a lower extremity CTO lesion.

[0004] In addition, when the antegrade guidewire cannot open the CTO lesion, the surgeon will select the normal vascular segment at the distal end of the CTO for reverse blood flow puncture, and then insert the guidewire and catheter to open the CTO lesion in the reverse blood flow direction. After the retrograde guidewire passes through the lesion, it is necessary to dock with the antegrade catheter, lead out the retrograde guidewire, follow up with the antegrade catheter, and after the antegrade catheter passes through the CTO lesion, withdraw the retrograde guidewire, and insert the antegrade guidewire again for subsequent operations. This technical operation is relatively complex and cumbersome, and there is a risk that the antegrade guidewire cannot enter the true lumen after the retrograde guidewire is completely withdrawn.

[0005] Based on this, the utility model intends to provide a double-headed guidewire for vascular interventional operations, which can reduce the consumption of guidewires during the operation and simplify the operation steps during the reverse penetration of the lower limb arteries. Utility Model Content

[0006] The purpose of the utility model is to design a double-ended guidewire for interventional treatment of CTO in lower extremity arteries. On the one hand, both ends of the guidewire can be used to open the lesion segment, reducing the consumption of the guidewire; on the other hand, the design of different characteristics at the two ends of the guidewire allows the guidewire end suitable for the nature of the lesion to be selected by changing the direction of the guidewire in lesions of different natures; secondly, the double-ended guidewire can be operated bidirectionally in the retrograde operation of the lower extremity artery, reducing the surgical steps and greatly improving the surgical efficiency. The specific plan is as follows:

[0007] A double-headed guidewire for interventional treatment of CTO of lower limb arteries, the double-headed guidewire for interventional treatment of CTO of lower limb arteries is provided with a push rod core shaft, characterized in that a first guide wire tip end and a second guide wire tip end are respectively provided at both ends of the push rod core shaft;

[0008] The first guide wire head end comprises a guide wire core, a metal wire, a first spring coil sheath and an outer sheath, one end of the guide wire core is connected to the push rod core shaft, the first spring coil sheath is sleeved on the guide wire core, a distance is left between the end of the first spring coil sheath and the end of the guide wire core, the outer sheath is installed at the end of the first spring coil sheath, and a free metal wire is provided on the inner end surface of the outer sheath;

[0009] The second guide wire tip has the same structure as the first guide wire tip, or,

[0010] The second guide wire head end is a second spring coil sheath sleeved on the core shaft of the push rod, and the end of the second spring coil sheath is tapered.

[0011] Furthermore, the outer sheath is a polymer sheath with a hydrophilic coating on the surface.

[0012] Furthermore, the push rod core shaft is made of stainless steel.

[0013] Furthermore, the guide wire core is made of nickel-titanium alloy.

[0014] Furthermore, the surface of the second spring coil sheath has a hydrophilic coating.

[0015] The utility model has the beneficial effects:

[0016] 1) Due to the double-head design, the double-head guidewire of the utility model has more flexibility in vascular intervention operations. Both the first guidewire tip and the second guidewire tip can be used as the operating end, which greatly reduces the consumption of the guidewire during the operation and avoids the operation of re-selecting the distal blood vessel after the guidewire is withdrawn. It is suitable for multiple vascular lesions such as the iliac artery and the femoral popliteal artery. For complex vascular lesions, bidirectional operation can be performed during the reverse penetration of lower extremity arterial occlusive lesions, simplifying the current surgical steps.

[0017] 2) The design of the first and second guide wire tips of the Shaping Ribbon structure allows them to pass through the lesion area smoothly due to their high hardness and good pushability when encountering hard lesions such as plaques and calcifications. The free metal wire design in the outer sheath not only increases the tracking performance of the guide wire, but also provides sufficient support when encountering resistance to prevent the guide wire tip from bending and breaking.

[0018] 3) The design of the second guide wire tip of the conical second spring coil sheath is more suitable for lesion segments with more thrombus components, and its conical design can easily penetrate the thrombus.

[0019] 4) The presence of the hydrophilic coating greatly reduces the friction between the first and second guide wire tips in the blood vessel, thereby improving the smoothness of the operation.

[0020] 5) When it is necessary to switch between antegrade and retrograde operations, the double-ended guidewire design greatly simplifies the surgical steps and reduces surgical risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A cross-sectional view of a double-ended guide wire structure provided in Example 1 of the utility model;

[0023] Figure 2 A cross-sectional view of a double-ended guide wire structure provided in Example 2 of the utility model. DETAILED DESCRIPTION

[0024] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0025] In order to thoroughly understand the present invention, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution of the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0026] The double-ended guidewire provided by the utility model is characterized in that the structures at both ends of the guidewire are made of the same or different materials or structures. The design of the same materials and structures at both ends of the guidewire can be used to explore the gaps in CTO lesions. When one end of the guidewire is worn or deformed, the other end can be replaced, which helps to reduce the consumption of the guidewire. When the CTO lesion is hard and difficult to pass, one end of the guidewire can be designed to have a structure with a higher hardness at the head end, and the two ends make the two ends of the guidewire have different characteristics, which can cope with different vascular lesions.

[0027] Embodiment 1

[0028] like Figure 1 As shown, the push rod core shaft 1 can be made of stainless steel or other alloy wires, and a first guide wire head end 4 and a second guide wire head end 5, both of which are Shaping Ribbon structures, are provided at both ends of the guide wire. The first guide wire head end 4 and the second guide wire head end 5 both include a guide wire core 41, a metal wire 42, a first spring coil sheath 43 and an outer sheath 44. The guide wire core 41 is a nickel-titanium alloy wire, and is relatively long and thin. One end of the guide wire core 41 is connected to the push rod core shaft 1, and the first spring coil sheath 43 is sleeved on the guide wire core 41. The end of the first spring coil sheath 43 is spaced from the end of the guide wire core 41. The outer sheath 44 is installed at the end of the first spring coil sheath 43. A metal wire 42 with a free end is provided on the inner end surface of the outer sheath 44, and the metal wire 42 is not directly connected to the guide wire core 41. The outer sheath 44 is a polymer sheath with a hydrophilic coating on the surface, which makes the head end softer, more flexible and trackable, and easier to shape.

[0029] When one end of the guide wire is worn or deformed during superselective passage through vascular stenosis or occlusive lesions, the other end can be replaced, which helps to reduce guide wire consumption.

[0030] Embodiment 2

[0031] like Figure 2 As shown, one end of the double-headed guidewire provided in this embodiment adopts the same ShapingRibbon structure as that of the first embodiment. The relevant structural description can be referred to above and will not be repeated here. The other end directly uses the stainless steel push rod core shaft 1 as the second guidewire core 52, and a second spring coil sheath 51 is sleeved on the second guidewire core 52. The end of the second spring coil sheath 51 is conical and has a hydrophilic coating on the surface, so that the head end has better support, pushing force and twist control, good tactile feedback, easy to operate, suitable for passing lesions with large resistance, and is beneficial to plaque fibrous caps, calcified lesions, etc.

[0032] In summary, the double-ended guidewire provided by the utility model has an innovative structural design, so that the two ends of the guidewire have different characteristics to meet the needs of different vascular lesions. In Example 1, both ends of the double-ended guidewire adopt a Shaping Ribbon structure, which shows good pushability and tracking when passing through vascular stenosis or occlusion lesions. At the same time, when encountering hard lesions, it can also pass smoothly due to its high hardness and good pushability. At the same time, the free metal wire design in the outer sheath not only increases the tracking ability of the guidewire, but also provides sufficient support when encountering resistance, preventing the bending and breakage of the guidewire tip.

[0033] In the second embodiment, one end of the double-ended guidewire still adopts the Shaping Ribbon structure, while the other end directly uses the stainless steel push rod core as the guidewire core, and is sheathed with a conical second spring coil sheath. This design makes the guidewire at this end have better support, pushing force and twist control, and is easy to control, especially suitable for passing through lesions with large resistance, such as plaque fibrous caps, calcified lesions, etc.

[0034] The double-ended guidewire provided by the utility model not only reduces the consumption of the guidewire during the operation, but also avoids the operation of reversing the direction and reselecting the distal blood vessel after the guidewire is withdrawn, greatly simplifying the surgical steps and reducing the surgical risks. In addition, the presence of the hydrophilic coating also greatly reduces the friction of the guidewire in the blood vessel, improving the smoothness of the operation.

[0035] In general, the double-headed guidewire provided by the utility model has the advantages of clever design, comprehensive functions, easy operation, and a wide range of applications, and is expected to provide a more efficient and safe solution for vascular interventional surgery.

[0036] The above describes the preferred embodiments of the utility model. It should be understood that the utility model is not limited to the above-mentioned specific implementation methods, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the utility model without departing from the scope of the technical solution of the utility model, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the utility model. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of protection of the technical solution of the utility model.

Claims

1. A double-ended guidewire for interventional treatment of CTO of lower limb arteries, the double-ended guidewire for interventional treatment of CTO of lower limb arteries being provided with a push rod core shaft (1), characterized in that: A first guide wire head end (4) and a second guide wire head end (5) are respectively provided at both ends of the push rod core shaft (1); The first guide wire head end (4) comprises a guide wire core (41), a metal wire (42), a first spring coil sheath (43) and an outer sheath (44); one end of the guide wire core (41) is connected to the push rod core shaft (1); the first spring coil sheath (43) is sleeved on the guide wire core (41); a distance is left between the end of the first spring coil sheath (43) and the end of the guide wire core (41); the outer sheath (44) is installed at the end of the first spring coil sheath (43); and a metal wire (42) with a free end is provided on the inner end surface of the outer sheath (44); The second guide wire tip (5) has the same structure as the first guide wire tip (4), or, The second guide wire head end (5) is a second spring coil sheath (51) sleeved on the push rod core shaft (1), and the end of the second spring coil sheath (51) is conical.

2. A double-ended guidewire for interventional treatment of lower extremity artery CTO as claimed in claim 1, characterized in that: The outer sheath (44) is a polymer sheath with a hydrophilic coating on the surface.

3. A double-ended guidewire for interventional treatment of lower extremity artery CTO as claimed in claim 1, characterized in that: The push rod core shaft (1) is made of stainless steel.

4. A double-ended guidewire for interventional treatment of lower extremity artery CTO as claimed in claim 1, characterized in that: The guide wire core (41) is made of nickel-titanium alloy.

5. A double-ended guidewire for interventional treatment of lower extremity artery CTO as claimed in claim 1, characterized in that: The surface of the second spring coil sheath (51) is provided with a hydrophilic coating.

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