WO2015055052A1 - 提高安全性的肺动脉支架及肺动脉瓣膜置换装置 - Google Patents

提高安全性的肺动脉支架及肺动脉瓣膜置换装置 Download PDF

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Publication number
WO2015055052A1
WO2015055052A1 PCT/CN2014/085471 CN2014085471W WO2015055052A1 WO 2015055052 A1 WO2015055052 A1 WO 2015055052A1 CN 2014085471 W CN2014085471 W CN 2014085471W WO 2015055052 A1 WO2015055052 A1 WO 2015055052A1
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Prior art keywords
stent
pulmonary artery
pulmonary
flared
safety
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PCT/CN2014/085471
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English (en)
French (fr)
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曾敏
范拉里
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杭州启明医疗器械有限公司
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Publication of WO2015055052A1 publication Critical patent/WO2015055052A1/zh

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/24—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body
    • A61F2/2412—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body with soft flexible valve members, e.g. tissue valves shaped like natural valves
    • A61F2/2418—Scaffolds therefor, e.g. support stents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004—Rounded shapes, e.g. with rounded corners
    • A61F2230/0013—Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063—Three-dimensional shapes
    • A61F2230/0073—Quadric-shaped
    • A61F2230/0078—Quadric-shaped hyperboloidal
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063—Three-dimensional shapes
    • A61F2230/0073—Quadric-shaped
    • A61F2230/008—Quadric-shaped paraboloidal
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0039—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in diameter

Definitions

  • the invention belongs to the field of medical technology, and in particular relates to a pulmonary artery stent and a pulmonary valve replacement device for improving safety.
  • the most common type of cyanotic congenital heart disease in the right ventricular outflow tract is the tetralogy of Fallot (TOF). According to the Shanghai Children's Medical Center, the most common patients with TOF surgery are 6 months to 3 years old. This age group of surgical patients accounts for 74% of the total number of patients.
  • Classical procedures include VSD repair, right ventricular outflow obstruction, and pulmonary artery (valve and valve) stenosis relief.
  • the patch used in the operation does not conform to the growth of the human body, and it is easy to produce re-stenosis or valvular lesions, and the condition will become heavier with age.
  • severe pulmonary regurgitation PR
  • Severe PR will lead to a large increase in right ventricular volume load.
  • the right ventricular cavity will be enlarged, and the right ventricular contraction and blood discharge function will be reduced.
  • the patient's exercise tolerance will be significantly reduced, and even arrhythmia may occur.
  • RV EDV right ventricular end-diastolic volume / body surface area
  • the patient may even die suddenly. Therefore, the patient needs to undergo a new thoracotomy to place a new artificial pulmonary valve.
  • secondary or secondary surgery is not only difficult, but also has high risk and mortality.
  • interventional therapy to the pulmonary valve replacement device not only effectively terminates the massive reflux of the pulmonary artery, but also improves the blood circulation and right ventricular function of the lung tissue to achieve the therapeutic purpose, and avoids the thoracotomy again.
  • the prior art pulmonary valve replacement device is composed of a mesh stent made of a memory metal material and a unidirectional open trilobal valve sewed in the stent.
  • FIG. 1 shows a conventional pulmonary valve.
  • the pulmonary artery stent of the replacement device has a reticulated saddle-shaped cylindrical structure, and the network structure is composed of a regular diamond shape.
  • the pulmonary artery stent is cut by a laser on a tube of a memory metal material to form a diamond-shaped hollow shape, when the pulmonary artery is formed. After the stent is released, the pulmonary stent is lifted as shown in Figure 1.
  • the ends of the expanded ends of the pulmonary stent will inevitably form sharp projections (such as the m portion in Figure 1). And n)), the sharp bulge easily punctures blood vessels and tissues, which increases the difficulty of surgery and the risk of surgery.
  • the shape of the two ends of the pulmonary artery stent is completely different from the central portion, if the entire pulmonary artery stent is integrally cut and heat-treated, Due to the differences in the physiological structure of different patients, it is necessary to customize a variety of different types of pulmonary stents, corresponding cutting and heat treatment Arts, complex tools, it will increase the cost of surgery.
  • the invention provides a pulmonary artery stent with improved safety, high safety and convenient processing.
  • An improved safety pulmonary stent comprises a tubular support grid and two flared sections respectively connected to the axial ends of the support grid, each flare section passing through the fixing member and the support grid The ends are connected.
  • the pulmonary artery stent is a modular structure, and has three modules: two flared segments and a support grid.
  • the flared section is connected to the support grid by a fixing member. Therefore, the selection of the fixing member should facilitate the pulmonary artery. Mounting and dismounting of the bracket.
  • the flared section has a plurality of peaks at one end of the support grid, and all of the peaks have a smooth outer edge.
  • the peak part has a smooth outer edge, that is, the peak part is curved, which avoids the puncture of blood vessels and tissues under the continuous movement of the heart after the release of the pulmonary artery stent, which reduces the difficulty of surgery, avoids the risk of surgery, and improves safety.
  • the at least one flared section is a wavy structure in which a single wire is wound.
  • the flared section mainly serves as a supporting and positioning function, so that the pulmonary artery stent can be stably positioned at the implantation position, and the flared section is made of a single wire, which can meet the positioning requirements, and the processing thereof is easier, and the single wire is performed.
  • the angle can be bent at a suitable angle. More preferably, the two flared sections are wavy structures wound by a single wire.
  • the supporting grid has a plurality of cells distributed circumferentially adjacent to one end of each of the flared segments, and the trough portions of the undulating structure are connected to the vertices of the cells.
  • the number of troughs is less than the number of cells corresponding to the flared section. In this way, cells are spaced between adjacent troughs, and the hollowed-out area formed between the flared section and the support grid is larger, which reduces the blocking effect on blood flow.
  • the number of troughs is one-half of the number of cells corresponding to the flared segments. Too small number of troughs will affect the stability of the positioning of the pulmonary artery stents, that is, there is a cell between adjacent troughs, which can ensure the stability of the positioning while making the hollowing area of the larger area between the flared section and the supporting grid.
  • the fixing member is a flexible binding tape.
  • the flared section can be firmly tied to the support grid and is easy to operate.
  • the present invention also provides a pulmonary valve replacement device comprising the safety-enhancing pulmonary artery stent and a prosthetic valve disposed within the pulmonary artery stent.
  • the support grid and the flared section adjacent to the right chamber outflow channel are coated.
  • the film wraps the fastener.
  • the structure of the pulmonary artery stent means a structure in a state in which the human body is completely opened.
  • the entire pulmonary artery stent is integrally engraved and processed.
  • the two flared sections and the support grid are three modules, and the flared section and the support grid are connected by a fixing member, that is, The detachable section and the support grid are detachable and have the following advantages:
  • the ends of the two ends of the pulmonary artery stent will inevitably form a sharp protrusion, and the present invention can completely overcome the defect, and the flared section can be separately processed into a suitable shape and then mounted to the support net. On the shelf.
  • the adjustment of the length of the pulmonary artery stent can be adapted to solve the problem of the difference in the physiological structure and the lesion site of most patients, in the prior art, various types of pulmonary artery stents need to be prepared for different patients.
  • the support grid is Tubular, different lengths of support grid can be used only when the same mold is used, without a bracket for a set of molds, which greatly saves costs.
  • the fixation member and the membrane do not affect the stability of the positioning of the pulmonary stent while ensuring valve compliance.
  • FIG. 1 is a schematic view showing the structure of a pulmonary artery stent in the prior art.
  • FIG. 2 is a schematic perspective view of a pulmonary artery stent of the present invention for improving safety.
  • Figure 3 is a front elevational view of the pulmonary stent of the present invention for improved safety.
  • Fig. 4 is a schematic view showing the simple structure of a pulmonary artery stent for improving safety in the present invention.
  • Fig. 5 is a structural schematic view showing one of the flared sections of the pulmonary artery stent for improving safety according to the present invention.
  • Fig. 6 is a structural schematic view showing another flared section of a pulmonary artery stent for improving safety according to the present invention.
  • Fig. 7 is a structural schematic view showing the fixing of the flared section and the supporting grid in the pulmonary artery stent of the present invention.
  • FIGS. 2 to 4 show the structure of the pulmonary artery stent of the present invention, including the support grid 1 and two flared sections respectively connected to the axial ends of the support grid 1, respectively, which are the outflow flare section 2a and the flow inflow and expansion Segment 2b.
  • the support grid 1 is tubular and consists of a continuous diamond shape. Of course, it can also be composed of an elliptical shape and an irregular shape. There is no strict requirement, as long as the support and compliance of the pulmonary artery stent are ensured.
  • the diameter and length of the support grid 1 can be of a conventional size or can be tailored to the specific circumstances of the patient.
  • the support grid 1 is adjacent to the end of the outflow flared section 2a and has twelve cells distributed around the circumference, which is named as the first cell 3.
  • the support grid 1 is also adjacent to the end of the flared section 2b.
  • the twelve cells of the distribution are named as the second cell 4.
  • the first cell and the second cell in the text are distinguished by naming for convenience of description, and do not represent different structures.
  • the outflow flared section 2a is located substantially in the main pulmonary artery near the branch of the pulmonary artery. As shown in Fig. 5, the outflow flared section 2a is a wave-shaped structure formed by a single wire, and the peak 5 of the wave-shaped structure has a circular arc shape.
  • the trough 6 of the wavy structure is connected to the apex of the first cell 3, ie at this location, the fixing member 7 connects the flared section 2a to the end of the support grid 1, and in addition, the wave of the flared section 2a
  • the shaped structure has six peaks 5 and six troughs 6, and a first cell 3 is spaced between adjacent troughs 6, whereby six outflow regions are formed between the outflow flared section 2a and the support grid 1 .
  • the flow-in flared section 2b is located substantially in the right chamber outflow channel, similar to the structure of the outflow flared section 2a. As shown in Fig. 6, the flow-in flare section 2b is also a wavy structure in which a single wire is wound, and the wave-shaped structure
  • the peak portion has a circular arc shape, and the trough of the wavy structure is connected to the apex of the second cell 4, that is, at this portion, the fixing member will flow into the flared portion 2b to be connected to the end of the support grid 1, and
  • the wavy structure flowing into the flared section 2b has six peaks and six troughs, and a second cell 4 is spaced between the adjacent troughs, thereby flowing into the flared section 2b and the support grid 1 Between the six hollow areas, at least two peaks flowing into the flared section 2b can be used to connect to the delivery system.
  • the fixing member 7 is a flexible binding tape, and the outflow flared portion 2a and the end portion of the supporting mesh frame 1 corresponding to the flow-in flared portion 2b are respectively fixed, and the flow-out flared portion 2a is taken as an example, as shown in FIG.
  • the wrapped flexible tie wrap connects the two at the apex of the trough and the first cell by winding.
  • the ends 8a and 8b of the flexible tie wrap may be mated or fixed by knotting, bonding, hot melt, or the like.
  • the outflow flared section or the flow-in flared section and the support grid are not limited to the fixing method, and the selection can be flexibly.
  • the pulmonary artery stent is divided into three modules, and the two flared sections (flowing into the flared section and the outflowing flared section) are detachably connected with the support grid, and the support grid can be engraved on the memory metal pipe.
  • the inlet flare section and the outflow flare section are formed by bending a single wire, and finally, the flow into the flare section and the outflow flare section are connected with the support grid, and the length of the support grid can be flexible according to the patient's condition. Select, and flow into the flared section and the outflow flared section are common.
  • the embodiment further provides a pulmonary valve replacement device, which supports the mesh frame and the film that flows into the flared section 2b, and the prosthetic three-leaf valve is sewn into the support mesh frame, and the outflow flared section 2a is wrapped by the membrane and flows out. There is still a hollow area between the flared section 2a and the support grid to ensure smooth blood flow. At the same time, in order to further strengthen the strength of the fixing member and increase the tissue climbing after implantation, the fixing member can be wrapped with a film.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)
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Abstract

一种提高安全性的肺动脉支架及肺动脉瓣膜置换装置，所述提高安全性的肺动脉支架包括管状的支撑网架（1）以及分别与所述支撑网架（1）轴向两端相连的两个扩口段（2a，2b），每个扩口段（2a，2b）通过固定件（7）与所述支撑网架（1）的端部相连，所述扩口段（2a，2b）背向支撑网架（1）的一端带有若干波峰（5），所有的波峰（5）部位带有平滑的外缘。所述肺动脉瓣膜置换装置，包括如所述的提高安全性的肺动脉支架以及设置在所述肺动脉支架内的假体瓣膜。扩口段（2a，2b）与支撑网架（1）通过固定件（7）进行连接，即所述的扩口段（2a，2b）与支撑网架（1）之间为可拆卸连接方式，提高了安全性，且使用更加灵活，同时也降低了加工的难度。

Description

提高安全性的肺动脉支架及肺动脉瓣膜置换装置 技术领域
本发明属于医疗技术领域，尤其涉及一种提高安全性的肺动脉支架及肺动脉瓣膜置换装置。
 背景技术
右室流出道狭窄的青紫型先天性心脏病患者，需要在婴幼儿或儿童早期施行体外循环下开胸心脏纠治术。
在右室流出道狭窄的青紫型先天性心脏疾病中最常见的是法洛式四联症（TOF）。上海儿童医学中心资料显示TOF手术最常见病人年龄为6个月~3岁，这个年龄阶段手术病人占总手术人数的74%。经典手术包括VSD修补，右室流出道梗阻和肺动脉（瓣环与瓣膜）狭窄解除。
通常，大部分法洛式四联症合并肺动脉瓣上狭窄（肺动脉主干与左右肺动脉分枝狭窄），主要采用自右室流出道（RVOT）跨肺动脉瓣至肺动脉主干（MPA）和左右肺动脉分枝（LPA与RPA）补片扩大成型术。上海儿童医学中心资料显示：1999年4月至2011年12月，所有TOF手术病人记录抽调1999年、2000年、2001年、2002年、2003年、2005年、2007年、2009年、2011年合计9年统计数共1851例，其中做了此类补片扩大成型术有1569例，占总数84.76%。
手术中使用的补片，并不能顺应人体的生长，很容易产生再次狭窄或瓣膜病变，且随着年龄的增长，病情会越来越重。另外，由于无瓣膜，术后会并发严重的肺动脉返流（PR）。重度的PR会导致右心室容量负荷大量增加，长期以往会造成右心室腔扩大，随之右心室收缩排血功能下降，患者运动耐量明显下降，甚至出现心率失常。国外研究资料提示当右心室舒张末容量/体表面积（RV EDV Index）＞150ml/m²时，患者甚至会发生猝死。因此，患者需要接受再次开胸手术置入新的人工肺动脉瓣。但是二次或二次以上手术不但手术难度大，且有较高的危险性和死亡率。
应用介入治疗方式植入肺动脉瓣膜置换装置不仅有效终止了肺动脉的大量返流，改善肺组织血液循环与右心室功能达到了治疗目的，并避免了再次开胸手术。
现有技术中的肺动脉瓣膜置换装置，由记忆金属材料制成的网状支架，以及缝制在该支架内的可单向开放的三叶瓣膜构成，图1显示了一种现有的肺动脉瓣膜置换装置的肺动脉支架，呈网状的马鞍形圆筒结构，网状结构由规则的菱形组成，通常，肺动脉支架通过激光在记忆金属材料的管材上进行切割加工，形成菱形的镂空形状，当肺动脉支架被释放后，肺动脉支架涨开如图1所示的状态，但是基于加工工艺的限制，肺动脉支架膨胀两端的端部仍会不可避免的形成尖锐的凸出部（如图1中的m部位和n部位），尖锐的凸出部易戳破血管、组织，增加了手术难度和手术风险，另外，由于肺动脉支架两端与中部的形状完全不同，若将整个肺动脉支架进行一体切割和热处理，由于不同患者生理结构的差异，需定制多种不同型号的肺动脉支架，对应的切割和热处理工艺、工具复杂，这无疑增加了手术的成本。
 技术问题
本发明提供了一种提高安全性的肺动脉支架，安全性高且加工方便。
 技术解决方案
一种提高安全性的肺动脉支架，包括管状的支撑网架以及分别与所述支撑网架轴向两端相连的两个扩口段，每个扩口段通过固定件与所述支撑网架的端部相连。
本发明中，肺动脉支架为模块结构，共三个模块：两个扩口段与支撑网架，组装时，通过固定件将扩口段与支撑网架相连，因此，固定件的选择应方便肺动脉支架的安装与拆卸。
所述扩口段背向支撑网架的一端带有若干波峰，所有的波峰部位带有平滑的外缘。波峰部位带有平滑的外缘即波峰部位呈弧形，避免了肺动脉支架在释放后心脏不断运动状态下戳伤血管、组织，降低了手术难度，规避了手术风险，提高了安全性。
作为优选，至少一个扩口段为单根金属丝绕成的波浪形结构。扩口段主要起支撑定位作用，可使肺动脉支架稳固的定位在植入位置，扩口段由单根金属丝制成，即可满足定位要求，且其加工更加容易，将单根金属丝进行适宜角度的弯折即可，更优选的，两个扩口段均为单根金属丝绕成的波浪形结构。
为便于固定件进行固定，所述支撑网架邻近每个扩口段的一端具有绕周向分布的若干单元格，所述波浪形结构的波谷部位与所述单元格的顶点相连。
每个扩口段中，波谷数量小于所述扩口段相对应的单元格的数量。这样，相邻波谷之间间隔有单元格，扩口段与支撑网架之间形成的镂空区域更大，降低对血流的阻挡作用。
优选的，每个扩口段中，波谷数量为所述扩口段相对应的单元格数量的二分之一。波谷数量过少会影响肺动脉支架定位的稳固性，即相邻波谷之间间隔有一个单元格，能够保证定位稳固性的同时使扩口段与支撑网架之间具有较大面积的镂空区域。
作为优选，所述的固定件为柔性绑扎带。可将扩口段与支撑网架牢固的绑扎在一起，且便于操作。
本发明还提供了一种肺动脉瓣膜置换装置，包括所述的提高安全性的肺动脉支架以及设置在所述肺动脉支架内的假体瓣膜。
所述支撑网架以及与右室流出道邻近的扩口段覆膜。
所述膜包裹所述固定件。
本发明中如果没有特殊说明，在描述肺动脉支架的结构时，均是指在人体内完全涨开状态下的结构。
 有益效果
与现有技术相比，本发明的有益效果为：
（1）现有技术中，整个肺动脉支架为一体雕刻加工而成，本发明中，两扩口段与支撑网架为三个模块，扩口段与支撑网架通过固定件进行连接，即所述的扩口段与支撑网架之间为可拆卸连接方式，具有如下优点：
首先，采用一体雕刻工艺，肺动脉支架两端的端部会不可避免的形成尖锐的凸出部，而本发明则可完全克服该缺陷，可单独对扩口段进行适宜形状的加工，再安装到支撑网架上。再次，由于通过肺动脉支架长度的调整能适应解决多数患者的生理结构、病变部位存在差异问题，现有技术中，需要针对不同的患者制备多种型号的肺动脉支架，本发明中，根据患者的具体需求仅需准备不同长度的支撑网架，将相应的支撑网架与扩口段安装在一起即可，模块式组合的方式能更加灵活的适应患者的需求；另外，本发明，支撑网架为管状，不同长度的支撑网架定型时可仅用同一个模具，无需一种支架一套模具，大大节省了成本。
（2）尽管本发明将扩口段与支撑网架之间变为可拆卸连接，固定件和覆膜在保证瓣膜顺应性的同时，并不影响肺动脉支架定位的稳固性。
 附图说明
图1为现有技术中肺动脉支架的结构示意图。
图2为本发明提高安全性的肺动脉支架的立体结构示意图。
图3为本发明提高安全性的肺动脉支架的主视图。
图4为本发明提高安全性的肺动脉支架的简单结构示意图。
图5为本发明提高安全性的肺动脉支架中其中一个扩口段的结构示意图。
图6为本发明提高安全性的肺动脉支架中另一个扩口段的结构示意图。
图7为本发明提高安全性的肺动脉支架中扩口段与支撑网架固定的结构示意图。
 本发明的实施方式
下面结合具体实施例对本发明作进一步阐释。
图2~图4示出了本发明肺动脉支架的结构，包括支撑网架1以及分别与支撑网架1轴向两端相连的两个扩口段，分别为流出扩口段2a和流进扩口段2b。
支撑网架1呈管状，由连续的菱形组成，当然也可由椭圆形、不规则形状组成，并没有严格的要求，只要保证肺动脉支架的支撑力和顺应性即可。支撑网架1的直径和长度可采用常规尺寸，也可以根据患者的具体情况针对性的进行定制。
支撑网架1邻近流出扩口段2a的一端具有绕周向分布的十二个单元格，命名为第一单元格3，支撑网架1邻近流进扩口段2b的一端也具有绕周向分布的十二个单元格，命名为第二单元格4，文中的第一单元格和第二单元格仅为方便描述而进行的命名上的区分，并非代表不同的结构。
流出扩口段2a大体位于主肺动脉靠近肺动脉分支口部位，如图5所示，流出扩口段2a为单根金属丝绕成的波浪形结构，波浪形结构的波峰5部位呈圆弧形，该波浪形结构的波谷6与第一单元格3的顶点相连，即在该部位，固定件7将扩口段2a与支撑网架1的端部相连接，另外，该扩口段2a的波浪形结构具有六个波峰5和六个波谷6，相邻的波谷6之间间隔有一个第一单元格3，由此，流出扩口段2a与支撑网架1之间围成六个镂空区域。
流进扩口段2b大体位于右室流出道部位，与流出扩口段2a的结构类似，如图6，流进扩口段2b也为单根金属丝绕成的波浪形结构，波浪形结构的波峰部位呈圆弧形，该波浪形结构的波谷与第二单元格4的顶点相连，即在该部位，固定件将流进扩口段2b与支撑网架1的端部相连接，另外，该流进扩口段2b的波浪形结构具有六个波峰和六个波谷，相邻的波谷之间间隔有一个第二单元格4，由此，流进扩口段2b与支撑网架1之间围成六个镂空区域，流进扩口段2b的至少两个波峰部位可用于与输送系统相连。
固定件7为柔性绑扎带，分别将流出扩口段2a和流进扩口段2b对应的与支撑网架1的端部固定，以流出扩口段2a为例进行说明，如图7所示，缠绕柔性绑扎带在波谷和第一单元格的顶点部位通过缠绕将两者连接。柔性绑扎带的两端头8a和8b可配合连接，或者通过打结、粘结、热熔等方式固定。当然，本发明中流出扩口段或流进扩口段与支撑网架并不仅仅限于该种固定方法，可灵活进行选择。
本发明中，肺动脉支架分为三模块，两扩口段（流进扩口段和流出扩口段）与支撑网架之间可拆卸连接，支撑网架可在记忆金属管材上进行雕刻，流进扩口段和流出扩口段由单根金属丝进行弯折形成，最后再将流进扩口段、流出扩口段与支撑网架相连，支撑网架的长度可根据病人的病症进行灵活选择，而流进扩口段和流出扩口段则可通用。
本实施例还提供了一种肺动脉瓣膜置换装置，支撑网架和流进扩口段2b部位覆膜，支撑网架内缝制有假体三叶瓣膜，流出扩口段2a由膜包裹，流出扩口段2a与支撑网架之间仍具有镂空区域，以保证血流畅通。同时为了进一步加强固定件强度，增加植入后组织爬覆，可用膜将固定件包裹。

Claims (10)

  1. 一种提高安全性的肺动脉支架，包括管状的支撑网架以及分别与所述支撑网架轴向两端相连的两个扩口段，其特征在于，每个扩口段通过固定件与所述支撑网架的端部相连。
  2. 如权利要求1所述的提高安全性的肺动脉支架，其特征在于，所述扩口段背向支撑网架的一端带有若干波峰，所有的波峰部位带有平滑的外缘。
  3. 如权利要求2所述的提高安全性的肺动脉支架，其特征在于，至少一个扩口段为单根金属丝绕成的波浪形结构。
  4. 如权利要求3所述的提高安全性的肺动脉支架，其特征在于，所述支撑网架邻近每个扩口段的一端具有绕周向分布的若干单元格，所述波浪形结构的波谷部位与所述单元格的顶点相连。
  5. 如权利要求4所述的提高安全性的肺动脉支架，其特征在于，每个扩口段中，波谷数量小于所述扩口段相对应的单元格的数量。
  6. 如权利要求5所述的提高安全性的肺动脉支架，其特征在于，每个扩口段中，波谷数量为所述扩口段相对应的单元格数量的二分之一。
  7. 如权利要求1所述的提高安全性的肺动脉支架，其特征在于，所述的固定件为柔性绑扎带。
  8. 一种肺动脉瓣膜置换装置，其特征在于，包括如权利要求1~7所述的提高安全性的肺动脉支架以及设置在所述肺动脉支架内的假体瓣膜。
  9. 如权利要求8所述的肺动脉瓣膜置换装置，其特征在于，所述支撑网架以及与右室流出道邻近的扩口段覆膜。
  10. 如权利要求9所述的肺动脉瓣膜置换装置，其特征在于，所述膜包裹所述固定件。
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