Medical expansion support

Abstract

The utility model relates to a medical dilation stent which comprises a catheter and a stent assembly, the stent assembly comprises a scissors fork mechanism, a first dilation plate, a second dilation plate and a pull rod, the near end of the scissors fork mechanism is connected to the far end of the catheter, the first dilation plate and the second dilation plate are oppositely connected to the scissors fork mechanism, and the far end of the pull rod is connected with the scissors fork mechanism. When the shear fork mechanism stretches out towards the far end, the first expansion plate and the second expansion plate are relatively close to each other; and when the scissor fork mechanism retracts towards the near end, the first expansion plate and the second expansion plate are relatively far away to expand. According to the utility model, the maximum expansion diameter is variable, and the diameter can be freely adjusted according to the diameter of a lesion blood vessel from the minimum diameter to the maximum diameter; only one expansion stent is needed for a single lesion, so that the consumable cost is reduced, and the operation time is shortened; the functions of medicine carrying, nicking, blades and the like can be added, so that the consumption of consumables is greatly reduced, and the cost is reduced; and the risk of expansion rupture does not exist, and the operation safety is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, and in particular relates to a medical expansion stent. Background Art

[0002] Balloons are one of the commonly used instruments for intracavitary treatment. For lesions in different parts and different types of diseases, a wide variety of balloon catheters with various uses have been developed on the market. Balloon angioplasty has become the standard treatment for vascular access stenosis, such as common diseases in vascular surgery: iliac vein stenosis, which can be treated with balloon angioplasty; arteriovenous fistula stenosis, which can be treated with balloon angioplasty; coronary artery stenosis, a common disease in cardiovascular surgery, can also be dilated with a balloon; ureteral stenosis, a common disease in urology, can also be dilated with a balloon.

[0003] The use of ordinary balloons is as follows: incremental balloon dilatation first uses a small diameter balloon to expand the channel, then uses a slightly larger diameter balloon to longitudinally disconnect the plaque, and finally uses a balloon with a diameter of 1:1 to the blood vessel to fully dilate. The disadvantages of ordinary balloons include:

[0004] 1. Uncontrolled balloon expansion. During balloon expansion, rotational tearing, radial tearing, and axial tearing may occur, causing uneven force on the blood vessel wall, thereby squeezing and tearing the plaque or blood vessel wall at the stenotic site, resulting in vascular dissection;

[0005] 2. When the size of a single balloon is fixed after expansion, multiple balloons are needed during surgery: if the diameter of the lesioned blood vessel is 8mm, multiple balloons of different diameters (5 / 6 / 7mm in diameter) are needed to expand the blood vessel one by one. The more balloons are used, the longer the surgery time and the higher the cost for the patient.

[0006] 3. The balloon has the risk of rupture due to high pressure and may damage the blood vessel wall. Summary of the invention

[0007] The utility model aims to provide a medical expansion stent, which adopts the novel expansion stent to replace the common balloon to expand the lesion.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0009] A medical expandable stent comprises a catheter and a stent assembly, wherein the stent assembly comprises a scissor mechanism, a first expansion plate, a second expansion plate and a pull rod, wherein the proximal end of the scissor mechanism is connected to the distal end of the catheter, the first expansion plate and the second expansion plate are relatively connected to the scissor mechanism, and the distal end of the pull rod is connected to the scissor mechanism to drive the scissor mechanism to extend and retract, and when the scissor mechanism extends toward the distal end, the first expansion plate and the second expansion plate are relatively close to each other; when the scissor mechanism retracts toward the proximal end, the first expansion plate and the second expansion plate are relatively far apart and expanded.

[0010] Preferably, in the above technical solution, the scissor mechanism comprises:

[0011] A pair of first rods: the proximal ends of the pair of first rods are connected to the distal end of the catheter and are pivotally connected to each other;

[0012] A pair of second rods: the proximal ends of the pair of second rods are respectively connected to the distal ends of the pair of first rods through a first pivot, and the pair of second rods are cross-arranged and pivoted at the intersection;

[0013] A pair of third rods, the proximal ends of the pair of third rods are respectively connected to the distal ends of the pair of second rods through a second pivot, and the distal ends of the pair of third rods are connected through a third pivot,

[0014] The first expansion plate and the second expansion plate are connected to one of the first pivot and the second pivot of the scissor-fork mechanism; the distal end of the pull rod is connected to the intersection of the scissor-fork mechanism and one of the third pivot.

[0015] Further preferably, a guide column is connected to the other of the first pivot and the second pivot of the scissor-fork mechanism, and a guide groove is provided on the inner side surface of the first expansion plate and the second expansion plate, and the guide groove extends along the telescopic direction of the scissor-fork mechanism, and the guide column can be slidably disposed in the guide groove of the first expansion plate and the second expansion plate.

[0016] Preferably, in the above technical solution, the support assembly further comprises a control member, which is arranged at the proximal end of the catheter and cooperates with the proximal end of the pull rod, and the control member is operated to pull the pull rod to drive the scissor mechanism to extend and retract.

[0017] Further preferably, the distal end of the operating member is arranged in the catheter and is connected to the catheter by a thread, the proximal end of the operating member is exposed from the proximal end of the catheter for operation, the distal end of the operating member is provided with a limiting groove, the proximal end of the pull rod has a limiting portion, and the limiting portion of the pull rod is arranged in the limiting groove of the operating member.

[0018] More preferably, the control member is provided with a hole, and the hole is at least used for passing a guide wire.

[0019] Preferably, in the above technical solution, a developing component is provided at the proximal end and / or the distal end of the scissor mechanism.

[0020] Preferably, in the above technical solution, outer surfaces of the first expansion plate and the second expansion plate are coated with a drug layer.

[0021] Preferably, in the above technical solution, outer surfaces of the first expansion plate and the second expansion plate are provided with blades or notching members.

[0022] Preferably, in the above technical solution, the first expansion plate and the second expansion plate are arc-shaped, and the arc-shaped openings of the first expansion plate and the second expansion plate are opposite to each other.

[0023] Preferably, in the above technical solution, the material of the pull rod is selected from stainless steel wire and nickel-titanium memory alloy.

[0024] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0025] The maximum expansion diameter of the expansion stent of the utility model is variable, and can be freely adjusted from the minimum diameter to the maximum diameter according to the maximum diameter of the diseased blood vessel;

[0026] The utility model only needs one expansion stent for a single lesion, thus reducing the cost of consumables and shortening the operation time;

[0027] The expansion plate of the utility model can add functions such as drug loading, notching, and blades, which can reflect the functions of current special balloons, greatly reduce the use of consumables and reduce costs;

[0028] The expansion stent of the utility model does not have the risk of expansion rupture, and the operation is highly safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Attached Figure 1 is a front view schematic diagram of the expandable stent of this embodiment in a collapsed state;

[0030] Attached Figure 2 is a right side schematic diagram of the expandable stent of this embodiment in a collapsed state;

[0031] Attached Figure 3 is a front view schematic diagram of the expandable stent of this embodiment in an expanded state;

[0032] Attached Figure 4 is a right side schematic diagram of the expandable stent of this embodiment in an expanded state;

[0033] Attached Figure 5(a) , 5(b) Schematic diagram of the cooperation between the guide groove and the guide column of the first / second expansion plate in this embodiment;

[0034] Attached Figure 6 is a cross-sectional schematic diagram of the control member in this embodiment;

[0035] Attached Figure 7(a) , 7(b) Schematic diagram of the expansion process of this embodiment.

[0036] In the above attached figure:

[0037] 1. Catheter;

[0038] 200, first rod; 201, second rod; 202, third rod; 203, first pivot; 204, second pivot; 205, third pivot;

[0039] 21. first expansion plate; 22. second expansion plate; 23. pull rod; 230. limit portion; 24. control member; 240. limit groove; 241. hole; 25. guide column; 26. guide groove;

[0040] 30. Blood vessels; 31. Embolism. DETAILED DESCRIPTION

[0041] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] like Figure 1-4 The medical expansion stent shown includes a catheter 1 and a stent assembly.

[0044] The support assembly includes a scissors-fork mechanism, a first expansion plate 21, a second expansion plate 22, a pull rod 23 and an operating member 24. The proximal end of the scissors-fork mechanism is connected to the distal end of the catheter 1. The first expansion plate 21 and the second expansion plate 22 are relatively connected to the scissors-fork mechanism. The distal end of the pull rod 23 is connected to the scissors-fork mechanism to drive the scissors-fork mechanism to extend and retract. The operating member 24 is arranged at the proximal end of the catheter 1 and cooperates with the proximal end of the pull rod 23. The operating member 24 is operated to pull the pull rod 23 to drive the scissors-fork mechanism to extend and retract.

[0045] In the initial state, the scissor mechanism extends toward the distal end, and the first expansion plate 21 and the second expansion plate 22 are relatively close to each other, so as to facilitate entering the lesion area. Figure 1 , 2 As shown; in the expanded state, the scissor mechanism retracts toward the proximal end, the first expansion plate 21 and the second expansion plate 22 are relatively far away and expanded, thereby expanding the embolization area, as shown Figure 3 , 4 shown.

[0046] The scissor-type mechanism includes a pair of first rods 200, a pair of second rods 201 and a pair of third rods 202. Wherein:

[0047] The proximal ends of a pair of first rods 200 are connected to the distal end of the catheter 1 and are pivotally connected to each other, that is, the proximal ends of the two rods can rotate relative to each other.

[0048] The proximal ends of a pair of second rod members 201 are respectively connected to the distal ends of a pair of first rod members 200 via a first pivot 203. The pair of second rod members 201 are cross-arranged and pivoted at the intersection, that is, the proximal end of a second rod member 201 is connected to the distal end of a first rod member 200 via a first pivot 203, and the pair of second rod members 201 and the pair of first rod members 200 are respectively connected via two first pivots 203.

[0049] The proximal ends of a pair of third rod members 202 are respectively connected to the distal ends of a pair of second rod members 201 via a second pivot 204, and the distal ends of a pair of third rod members 202 are connected via a third pivot 205, that is, the proximal end of a third rod member 202 is connected to the distal end of a second rod member 201 via a second pivot 204, and the pair of third rod members 202 and the pair of second rod members 201 are respectively connected via two second pivots 204.

[0050] In this way, a pair of first rods 200, a pair of second rods 201 and a pair of third rods 202 form two parallelogram structures, and the extension and retraction of the scissor mechanism is realized by the rotation of each pivot. Of course, more rods can also be added to form three, four or more parallelogram structures.

[0051] The inner surfaces of the first expansion plate 21 and the second expansion plate 22 are connected to one of the first pivot 203 and the second pivot 204 of the scissor-fork mechanism. In the figure: the first expansion plate 21 and the second expansion plate 22 are connected to the second pivot 204 of the scissor-fork mechanism. Since the pair of third rods 202 and the pair of second rods 201 are connected by two second pivots 204 respectively, the first expansion plate 21 and the second expansion plate 22 are respectively connected to one second pivot 204, and the two are opposite to each other.

[0052] In one implementation of this embodiment: a guide post 25 is connected to the other of the first pivot 203 and the second pivot 204 of the scissor mechanism, and a guide groove 26 is provided on the inner side surface of the first expansion plate 21 and the second expansion plate 22, and the guide groove 26 extends along the extension direction of the scissor mechanism, and the guide post 25 is slidably arranged in the guide groove 26 of the first expansion plate 21 and the second expansion plate 22. In the figure, the guide post 25 is connected to the first pivot 203 of the scissor mechanism, and through the cooperation of the guide post 25 and the guide groove 26, when the scissor mechanism is extended and retracted, the guide post 25 can slide in the guide groove 26, and the stability is improved while guiding. As shown in Figure 5 (a): the cross section of the guide post 25 is I-shaped, and the shape of the guide groove 26 matches it. The structure is simple, but there is no limit between the guide post 25 and the guide groove 26; as shown in Figure 5 (b): the cross section of the guide post 25 is T-shaped, and the shape of the guide groove 26 matches it. The T-shaped guide post 25 can limit the guide post 25 from escaping from the guide groove 26.

[0053] In one implementation of this embodiment: the first expansion plate 21 and the second expansion plate 22 are arc-shaped, and the arc-shaped openings of the first expansion plate 21 and the second expansion plate 22 are opposite. Compared with the linear expansion plate, the arc-shaped expansion plate forms a cylindrical structure after being relatively close and folded, with a smooth outer circumference, which is not easy to hurt the human body and has a relatively small volume.

[0054] In one implementation of this embodiment: the outer surface of the first expansion plate 21 and the second expansion plate 22 is coated with a drug layer, or a notch or a blade is provided to achieve the function equivalent to a special balloon. After the first expansion plate 21 and the second expansion plate 22 are expanded, the drug layer on the outer surface of the first expansion plate 21 and the second expansion plate 22 can contact the tissue to achieve a therapeutic effect; or a specific shape can be carved out by the notch, or the tissue can be cut.

[0055] The distal end of the pull rod 23 is connected to the intersection of the scissor mechanism and one of the third pivots. In the figure, the pull rod 23 is connected to the third pivot 205 of the scissor mechanism; the proximal end of the pull rod 23 penetrates the catheter 1 and is connected to the control member 24. The pull rod 23 can be made of stainless steel wire or nickel-titanium memory alloy, which usually has a certain hardness to pull the scissor mechanism and is soft and bendable.

[0056] In one implementation of this embodiment: the distal end of the operating member 24 is disposed in the catheter 1 and is connected to the catheter 1 by a thread, the proximal end of the operating member 24 is exposed from the proximal end of the catheter 1 for operation, the distal end of the operating member 24 is provided with a limiting groove 240, the proximal end of the pull rod 23 has a limiting portion 230, and the limiting portion 230 of the pull rod 23 is disposed in the limiting groove 240 of the operating member 24, such as Figure 6 As shown. A scale can be set on the catheter 1 or the control member 24, and the extension and retraction of the scissor mechanism can be accurately controlled by the scale. In the figure, the cross-sectional shape of the limit groove 240 and the limit portion 230 is also T-shaped. In this way, when the exposed end of the rotation control member 24, the control member 24 moves axially relative to the catheter 1, thereby pushing or pulling the pull rod 23 to move. In addition, a hole 241 is provided on the control member 24, and the hole 241 is at least used to pass the guide wire. Of course, this embodiment only provides one implementation method of the control member 24, and other methods may also be used.

[0057] The proximal end and / or the distal end of the scissor mechanism is also provided with a developing component, through which the position of the scissor mechanism can be determined, so as to perform a telescopic operation on it.

[0058] The working process of this embodiment is described in detail below:

[0059] As shown in FIG. 7( a ), in the initial state, the scissor mechanism is extended to the maximum length, the pair of first rods 200 , the pair of second rods 201 and the pair of third rods 202 are all close to each other, the first expansion plate 21 and the second expansion plate 22 are close to each other, and the expanded stent is delivered to the embolization position through the guide wire;

[0060] As shown in Figure 7(b), when the expandable stent reaches the embolization position, the pull rod 23 is pulled toward the proximal end, the scissors-fork mechanism contracts, the first expansion plate 21 and the second expansion plate 22 move away and open, and the embolization area is expanded; then the pull rod 23 is pushed toward the distal end, the scissors-fork mechanism extends, the first expansion plate 21 and the second expansion plate 22 move closer and close together, the expandable stent is rotated, and then the pull rod 23 is pulled toward the proximal end, the scissors-fork mechanism contracts, the first expansion plate 21 and the second expansion plate 22 move away and open, and the embolization area is expanded. Repeat the above steps, and after the embolization area is fully opened, continue to push the expandable stent or remove the expandable stent.

[0061] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A medical expandable stent, characterized in that: It includes a catheter and a bracket assembly, and the bracket assembly includes a scissor mechanism, a first expansion plate, a second expansion plate and a pull rod. The proximal end of the scissor mechanism is connected to the distal end of the catheter, and the first expansion plate and the second expansion plate are relatively connected to the scissor mechanism. The distal end of the pull rod is connected to the scissor mechanism to drive the scissor mechanism to extend and retract. When the scissor mechanism extends toward the distal end, the first expansion plate and the second expansion plate are relatively close to each other; when the scissor mechanism retracts toward the proximal end, the first expansion plate and the second expansion plate are relatively far apart and expanded.

2. The medical expandable stent according to claim 1, characterized in that: The scissor-fork mechanism comprises: A pair of first rods: the proximal ends of the pair of first rods are connected to the distal end of the catheter and are pivotally connected to each other; A pair of second rods: the proximal ends of the pair of second rods are respectively connected to the distal ends of the pair of first rods through a first pivot, and the pair of second rods are cross-arranged and pivoted at the intersection; A pair of third rods, the proximal ends of the pair of third rods are respectively connected to the distal ends of the pair of second rods through a second pivot, and the distal ends of the pair of third rods are connected through a third pivot, The first expansion plate and the second expansion plate are connected to one of the first pivot and the second pivot of the scissor-fork mechanism; the distal end of the pull rod is connected to the intersection of the scissor-fork mechanism and one of the third pivot.

3. The medical expandable stent according to claim 2, characterized in that: A guide column is connected to the other of the first pivot and the second pivot of the scissor-fork mechanism, and a guide groove is provided on the inner side surface of the first expansion plate and the second expansion plate. The guide groove extends along the telescopic direction of the scissor-fork mechanism, and the guide column can be slidably arranged in the guide groove of the first expansion plate and the second expansion plate.

4. The medical expandable stent according to claim 1, characterized in that: The support assembly also includes a control member, which is arranged at the proximal end of the catheter and cooperates with the proximal end of the pull rod. The control member is operated to pull the pull rod to drive the scissor mechanism to extend and retract.

5. The medical expandable stent according to claim 4, characterized in that: The distal end of the operating member is arranged in the catheter and is connected to the catheter by a thread. The proximal end of the operating member is exposed from the proximal end of the catheter for operation. A limiting groove is provided at the distal end of the operating member, and a limiting portion is provided at the proximal end of the pull rod. The limiting portion of the pull rod is arranged in the limiting groove of the operating member.

6. The medical expandable stent according to claim 5, characterized in that: The control member is provided with a hole, and the hole is at least used for passing a guide wire.

7. The medical expandable stent according to claim 1, characterized in that: The proximal end and / or the distal end of the scissor mechanism is provided with a developing component.

8. The medical expandable stent according to claim 1, characterized in that: The outer surfaces of the first expansion plate and the second expansion plate are coated with a drug layer, or; The outer surfaces of the first expansion plate and the second expansion plate are provided with blades or notching pieces.

9. The medical expandable stent according to claim 1, characterized in that: The first expansion plate and the second expansion plate are arc-shaped, and the arc-shaped openings of the first expansion plate and the second expansion plate are opposite to each other.

10. The medical expandable stent according to claim 1, characterized in that: The material of the pull rod is selected from stainless steel wire and nickel-titanium memory alloy.

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