CN100508913C - Indirect artificial valva outside vein - Google Patents

Abstract

The invention discloses an extravenous indirect artificial valve. The upper body of the valve and the lower body of the valve are connected by the valve shafts on both sides; the opposite ends of the upper body of the valve and the lower body of the valve are respectively provided with pressure points at the distal end of the blood vessel wall and pressure points at the proximal end of the blood vessel wall. Distal contact, the pressure point at the proximal end of the blood vessel wall can be in contact with the proximal end of the vein; the pressure points at the proximal end of the blood vessel wall of the upper valve body and the lower valve body are all fixed with fixed sutures to fix the upper valve body, the lower valve body, and the vein wall. When the blood flow flows from the proximal end of the vein to the distal end of the vein, it can close the compression point at the distal end of the vessel wall; when the blood flow flows from the distal end of the vein to the proximal end of the vein, the pressure point at the distal end of the energy vessel wall can be washed away . The invention can maintain the selective one-way flow of blood in the vein and has the function of a physiological valve; moreover, the device is placed outside the vessel wall to maintain the integrity of the vessel intima and reduce the possible risk of intravascular thrombosis after surgery.

Description

An extravenous indirect artificial valve

technical field

The invention relates to a medical device, in particular to an extravenous indirect artificial valve for treating deep venous insufficiency of lower limbs.

Background technique

In the blood circulation of the whole body of the human body, the return of blood from the lower limbs to the heart against gravity is an important part of the whole blood circulation. There are two main reasons why the blood of the lower limbs can resist gravity and return smoothly. One is that the muscles of the lower legs contract and relax alternately, acting as a muscle pump to squeeze the venous blood wrapped in the muscles to the heart; the other is that in the veins of the entire lower limbs, Generally, there is a venous valve every 10 to 20 centimeters to prevent the backflow of blood. However, due to other reasons such as congenital valvular poor structure, thrombus blockage or long-term standing weight bearing, valve closure is insufficient. This kind of disease is called deep venous insufficiency of the lower extremities. daily life and work. But at present, surgery is the first choice for this kind of disease, but various treatment methods have not yet achieved satisfactory results.

In recent years, many foreign scholars have proposed the design of their own valve substitutes. At present, the types of valve substitutes in foreign research mainly include: (1) Turn all or the intima of the vein wall to the cavity to form a valve-like structure, but scar contracture may occur after surgery, resulting in stenosis of the vein diameter, or even (2) Using stainless steel, platinum, etc. to manufacture artificial valves, such designs expose artificial implants directly to blood, which may cause thrombosis; (3) Design devices that regularly compress veins outside the tube wall, simulating Venous valve function. At present, the gastrocnemius muscle loop is used to compress the vein. When the lower limbs of the human body are in motion, the gastrocnemius muscle loop compresses the vein to simulate the function of the venous valve. However, in a resting state, the gastrocnemius muscle loop cannot function as a valve.

Contents of the invention

In order to solve the above technical problems, the object of the present invention is to provide an extravenous indirect artificial valve, a surgical implant device for maintaining selective unidirectional flow of blood in the vein.

The technical scheme adopted in order to realize the above-mentioned object invention is:

The upper body of the valve and the lower body of the valve are connected by the valve shafts on both sides; the opposite ends of the upper body of the valve and the lower body of the valve are respectively provided with pressure points at the distal end of the blood vessel wall and pressure points at the proximal end of the blood vessel wall. Distal contact, the pressure point at the proximal end of the blood vessel wall can be in contact with the proximal end of the vein; the pressure points at the proximal end of the blood vessel wall of the upper valve body and the lower valve body are all fixed with fixed sutures to fix the upper valve body, the lower valve body, and the vein wall.

The compression area of the distal compression point of the vessel wall is smaller than the compression area of the proximal compression point of the vessel wall; the compression degree of the compression point of the distal vessel wall is greater than that of the proximal compression point of the vessel wall; the projection of the compression point of the distal vessel wall and the valve axis in the axial direction of the vessel The distance is smaller than the projected distance between the compression point at the proximal end of the vessel wall and the valve axis.

The material of the valve upper body and the lower valve body is titanium alloy whose outer layer is coated with expanded polytetrafluoroethylene (ePTFE) layer.

The beneficial effects of the invention are: the invention can maintain the selective one-way flow of blood in the vein, and has the function of a physiological valve; moreover, the device is placed outside the blood vessel wall to maintain the integrity of the intima of the blood vessel and reduce postoperative intravascular Possible risk of thrombosis.

Description of drawings

Fig. 1 is a perspective view of the structural principle of the present invention;

Fig. 2 is a schematic structural view of the present invention in a closed state;

Fig. 3 is the sectional view of line A-A among Fig. 2;

Fig. 4 is the sectional view of B-B line among Fig. 2;

Fig. 5 is a schematic structural view of the present invention in an open state;

Fig. 6 is the sectional view of C-C line among Fig. 5;

Fig. 7 is a sectional view taken along line D-D in Fig. 5 .

In the figure: 1. Inferior body of the valve, 2. Upper body of the valve, 3. Valve axis, 4. Compression point at the distal end of the vessel wall, 5. Compression point at the proximal end of the vessel wall, 6. Vein wall, 7. Cross-section of the lumen of the vessel, 8 , fixed suture, 9, the distal end of the vein, 10, the proximal end of the vein.

Detailed ways

As shown in Figures 1 and 2, the upper valve body 2 and the lower valve body 1 are connected by valve shafts 3 on both sides; The compression point 5 at the proximal end of the wall, the compression point 4 at the distal end of the blood vessel wall can contact the distal end of the vein 9, and the compression point 5 at the proximal end of the blood vessel wall can contact the proximal end of the vein 10; the upper body of the valve 2 and the proximal end of the blood vessel wall of the lower body 1 The compression points 4 are all fixed with fixed sutures 8 to fix the upper valve body 2, the lower valve body 1 and the vein wall 6.

The compression area of compression point 4 at the distal end of the vessel wall is smaller than the compression area of compression point 5 at the proximal end of the vessel wall; the compression degree of compression point 4 at the distal end of the vessel wall is greater than that at compression point 5 at the proximal end of the vessel wall; The projection distance of 3 in the axial direction of the blood vessel is smaller than the projection distance of the compression point 5 at the proximal end of the blood vessel wall and the valve axis 3 .

The material of the upper valve body 2 and the lower valve body 1 is a titanium alloy whose outer layer is coated with an expanded polytetrafluoroethylene (ePTFE) layer.

The working principle of the present invention is as follows:

As shown in Fig. 2, Fig. 3 and Fig. 4, when the blood flows from the proximal vein 10 to the distal vein 9, the moment generated by the vein wall 6 on the compression point 5 at the proximal end of the vessel wall is greater than that of the vein wall 6 on the The moment generated by the compression point 4 at the distal end of the vessel wall increases the compression degree of the compression point 4 at the distal end of the vessel wall, resulting in the closure of the vein, as shown in Figure 3, while the compression degree of the compression point 5 at the proximal end of the vessel wall becomes greater, as shown in Figure 3 4. The device thus acts as a blocked backflow of blood.

As shown in Fig. 5, Fig. 6 and Fig. 7, when the blood flow flows from the distal end of the vein 9 to the proximal end of the vein 10, the moment generated by the vein wall 6 on the pressure point 4 of the distal end of the blood vessel wall is greater than that of the vein wall 6 on the The moment generated by the compression point 5 at the proximal end of the blood vessel wall, the compression degree of the compression point 4 at the distal end of the blood vessel wall becomes smaller, as shown in Figure 6, while the compression degree of the compression point 5 at the proximal end of the blood vessel wall becomes larger, but it will not be compressed to the vein The degree of closure is shown in Figure 7. Thus, the blood passes smoothly and flows to the heart.

As shown in Figure 2, in order to prevent the lateral displacement of the vein wall 6 at the compression point 5 at the proximal end of the blood vessel wall, the adventitia of the vein wall 6 and the upper valve body 2 and the lower valve body 1 are connected with surgical sutures when the device is installed. The expanded PTFE layer is sutured with eight sutures secured.

During the operation, the surgeon frees one end of the femoral vein, ligates and cuts off the collateral veins on the femoral vein, places the upper valve body 2 and the lower valve body 1 outside the wall of the femoral vein, and places the valve shafts on both sides. 3, suturing the fixed suture 8 again, thereby completing the main operation process of placing the extravenous indirect artificial valve.

The above specific embodiments are used to explain the present invention, rather than to limit the present invention. Within the spirit of the present invention and the protection scope of the claims, any modification and change made to the present invention will fall into the protection scope of the present invention.

Claims (2)

1. An extravenous indirect artificial valve is characterized in that: the upper valve body (2) and the lower valve body (1) are connected by valve shafts (3) on both sides; the upper valve body (2) is opposite to the lower valve body (1) The two ends of the vessel wall are respectively provided with a compression point (4) at the distal end of the vessel wall and a compression point (5) at the proximal end of the vessel wall. The compression point (4) at the distal end of the vessel wall can be in contact with the distal end of the vein (9). Point (5) can be contacted with vein near-end (10); Valve upper body (2) and the blood vessel wall near-end compression point (5) of valve lower body (1) all use fixed suture (8) to valve upper body (2) ) is fixed with the subvalvular body (1) and the vein wall (6); the compression area of the distal compression point (4) of the blood vessel wall is smaller than the compression area of the proximal compression point (5) of the blood vessel wall; the compression point (4) of the distal compression point of the blood vessel wall ) compression degree is greater than that of the compression point (5) at the proximal end of the vessel wall; the projection distance between the compression point (4) at the distal end of the vessel wall and the valve axis (3) in the axial direction of the vessel is smaller than the compression point (5) at the proximal end of the vessel wall and the valve axis (3) Projection distance. 2. A kind of extravenous indirect artificial valve according to claim 1, characterized in that: the material of the upper valve body (2) and the lower valve body (1) is titanium coated with an expanded polytetrafluoroethylene layer. alloy.

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