Unidirectional flap

Abstract

The invention discloses a unidirectional flap. The unidirectional flap comprises a framework and an isolation membrane, wherein the framework comprises a far end, a near end and at least three vertical beams which are arranged between the near end and the far end; membrane-coating loca are arranged on the surfaces of the vertical beams; convex points are arranged on the membrane-coating loca and used for increasing friction force between the unidirectional flap and a bronchial tube; at least one isolation membrane penetrates through the membrane-coating loca to be covered on the surface of the far end; a mesh is arranged at the far end; and the near end is a closed structure which is composed of 2-3 sealed, mutually-separated and flap-shaped structures. According to the unidirectional flap, due to the adoption of the closed framework structure, support force and stability of the framework are improved; and quoin points, contacted with the inner wall of the bronchial tube, of the framework are reduced; damage rate of the inner wall of the bronchial tube caused due to machines is reduced; and occurrence probability of bronchitis is reduced.

Description

technical field [0001] The invention belongs to the field of medical devices, and relates to an implantable medical device, in particular to a one-way valve implanted into the lung by intervention for treating lung diseases. Background technique [0002] Chronic obstructive pulmonary disease, such as emphysema, is a common lung disease. Traditionally, medical treatment of emphysema includes oxygen inhalation, prevention of lung infection, bronchial spasm relief, etc., but the curative effect is extremely limited; surgical treatment is mostly based on lung volume reduction surgery, but there are many limitations, such as Strict surgical indications, many complications, anesthesia and anesthesia-related complications, difficult to predict preoperative curative effect, postoperative unsatisfactory results caused by too much or too little resection, high surgical cost And greater mental and physical pain, in addition, some patients often cannot tolerate surgery because of their...

AI Technical Summary

Problems solved by technology

[0008] (2) The duckbill bronchial valve has an open structure at both ends, which is not conducive to loading the controllable connection part and recovery part at the end of the device, so the release process is uncontrollable, the frame jumps forward, and it cannot be accurately positioned in the emphysema area ;If the release position is wrong, the device cannot be retracted into the sheath and released again

[0009] (3) The treatment effect is not good, and there are still symptoms of airflow obstruction such as pneumothorax and secretion accumulation, which may be because the opening of the duckbill valve 105 is located in the middle of the valve support 103, and the opening of the duckbill valve 105 is far away from the inner wall of the bronchus The mucociliary of the bronchi cannot be discharged naturally through the movement of the mucociliary of the bronchi;

[0010] (4) The slit width of the duckbill valve 105 opening is limited, which can easily lead to accumulation of secretions, and the secretion can only be discharged from the slit by coughing

[0015] (2) Since the anchor rod 205 is too long, it will damage the inner wall of the bronchi, increasing the risk of complications such as bronchitis;

[0016] (3) The umbrella-shaped bronchial valve is an open structure at both ends, and its release process is uncontrollable, and the frame 202 may jump forward, which cannot be accurately positioned in the emphysema area; in addition, if the release position is found to be wrong, the device will also Cannot be retracted into the sheath for re-release;

[0017] (4) The struts 204 and anchors 205 of the umbrella-shaped bronchial valve are connected together by welding. Both the struts 204 and the anchors 205 are elastic and their ends extend independently of each other, so the struts 204 and the anchors 205 The ends are easily bent and deformed;

[0018] (5) When the umbrella-shaped bronchial valve is placed in the bronchi, once the strut 204 and the anchor rod 205 are deformed non-axisymmetrically, the umbrella-shaped structure is easy to tilt, resulting in a large gap between the insulating membrane 207 and the bronchial wall. As a result, the umbrella-shaped bronchial valve loses its function of preventing external air from entering the tissue in the emphysema area

[0020] (1) The open port of the bronchial valve has many protruding corner nodes in contact with the inner wall of the bronchi, which can easily lead to bronchial inflammation

[0021] (2) The release of the bronchial valve is uncontrollable. When the device is released in the bronchus, there is a risk of device jumping forward, and it cannot be precisely located in the emphysema area;

[0022] (3) After the bronchial valve is released in the bronchus, it cannot be recovered into the sheath, and the inner wall of the trachea and the vocal cords will be damaged during the recovery process;

[0023] (4) For the duckbill bronchial valve, the opening of the duckbill-shaped valve is too small, which may easily cause blockage of tissue secretions in the emphysema area and increase the risk of bronchial inflammation; The opening of the device is far away from the inner wall of the bronchus, which is not conducive to the complete discharge of secretions in the lung tissue in the emphysema area; in addition, the duckbill valve is made of silicone rubber, which has poor mechanical properties such as tensile strength and tear strength;

[0024] (5) For the umbrella-shaped bronchial valve, both ends of the umbrella-shaped frame are slender and elastic branches independent of each other, so when the two ends of the frame 202 are stressed, they are easy to bend and deform to reduce the supporting force and lose balance, resulting in the umbrella-shaped bronchial valve Inclined, resulting in a large air leakage gap between the polyurethane insulating film 207 and the inner wall of the bronchus, thereby losing the medical function of the device

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