Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, an embodiment of the present invention provides a valve stent 13 delivery device, including: a housing 10, a conical head 11, a telescopic mesh 12, a valve holder 13, a pusher 14 and a nitinol tube 15, wherein:
the cone head 11 is fixedly connected with the nickel-titanium tube 15, the shell 10 is movably sleeved on the surface of the nickel-titanium tube 15, and the shell 10 is abutted with the cone head 11;
The telescopic net 12, the valve support 13 and the propeller 14 are sequentially and movably sleeved on the surface of the nickel-titanium tube 15 and positioned in the shell 10, a first end of the telescopic net 12 is fixedly connected with the nickel-titanium tube 15, a second end of the telescopic net 12 is fixedly connected with the propeller 14, and the first end and the second end of the telescopic net 12 are opposite;
a plurality of limiting holes 121 are formed in the telescopic net 12 at positions perpendicular to the connecting lines of the first end and the second end, and the second end of the valve bracket 13 is abutted against the propeller 14;
in the initial state of the telescopic net 12 is an extended state, and in the condition that the telescopic net 12 is in the extended state, the first end of the valve bracket 13 is inserted into the plurality of limiting holes 121;
the nitinol tube 15 moves the expandable mesh 12 away from the valve holder 13 and causes the expandable mesh 12 to enter a contracted state from an expanded state, and the first end of the valve holder 13 is separated from the plurality of limiting holes 121 with the expandable mesh 12 in the contracted state.
In this embodiment, by providing a device for delivering a valve stent 13, the problem that the existing valve stent 13 has large elastic force and is easy to be ejected in the release process can be effectively solved. The operating principle is that when the valve bracket 13 is transported, the telescopic net 12 is inserted into the valve bracket 13 and is arranged in the shell 10, and the telescopic net 12 is in an extending state to fix the valve bracket 13; the telescopic net 12 is compressed to be in a contracted state in the process of releasing the valve support 13, and the valve support 13 is sequentially and slowly released from the second end to the first end, so that the elastic force in the process of releasing the valve support 13 is reduced, and the occurrence of ejection problems is reduced.
When the valve support 13 needs to be released, the nickel-titanium tube 15 and the conical head 11 drive the first end of the telescopic net 12 to be far away from the valve support 13, so that the telescopic net 12 is compressed to be in a contracted state, at the moment, the limiting holes 121 on the telescopic net 12 are also separated from the valve support 13 along with the deformation of the telescopic net 12, the valve support 13 is released without being acted by the limiting holes 121, and the natural state of the valve support 13 is restored.
Wherein the stretchable net 12 is in a stretched state when not subjected to external force.
Alternatively, as shown in fig. 2 and 3, the limiting hole 121 is square, each side of the square is wound with a fixed number of turns of wire 122, and the wire 122 is made of gold wire or platinum iridium alloy wire.
In this embodiment, the specific position of the valve stent 13 delivery device in the human body is confirmed by the wire 122 wound around the limiting hole 121, so that the operator can conveniently determine the position.
Specifically, when the heart valve is transported to the target position and not released yet, the relative position of the limiting hole 121 is confirmed by the X-ray, so that the operator can determine the specific position of the valve holder 13, and thus determine whether to release the valve holder 13.
Wherein, the limit hole 121 has a side length of 3mm to 8mm, and the number of windings on each side is 1 to 10. The stable insertion between the valve holder 13 and the telescopic mesh 12 can also be achieved by winding the wire 122.
Optionally, the material of the telescopic mesh 12 is nickel-titanium alloy wire.
In the present embodiment, the use of nickel-titanium alloy wires allows the stretchable net 12 to have a stretchable performance while maintaining a constant strength. Wherein the nickel titanium alloy wire has a diameter of 20 μm to 80 μm and a braiding density of 20PPI to 150PPI, and is processed by a special die fixing heat treatment to form the stretchable net 12.
Optionally, as shown in fig. 1, a first fixing ring 123 is disposed at a first end of the telescopic net 12, a second fixing ring 124 is disposed at a second end of the telescopic net 12, the first fixing ring 123 is fixedly connected with the nitinol tube 15, and the second fixing ring 124 is movably sleeved on the surface of the nitinol tube 15, and the second fixing ring 124 is fixedly connected with the propeller 14.
In this embodiment, the first fixing ring 123 and the second fixing ring 124 enable the telescopic net 12 to move relative to the nitinol tube 15, and also facilitate the inspection and replacement of the telescopic net 12.
Specifically, the first end of the stretchable net 12 is fixed to the first fixing ring 123, and the second end of the stretchable net 12 is fixed to the second fixing ring 124, so that the stretchable net 12 and the fixing ring form a whole. The first fixing ring 123 is fixedly connected with the nitinol tube 15, the second fixing ring 124 is fixedly connected with the propeller 14, so that the first end of the telescopic net 12 and the nitinol tube 15 can synchronously move through the first fixing ring 123 when the telescopic net 12 is in a contracted state, and the second end of the telescopic net 12 and the propeller 14 are fixed and do not move, thereby realizing that the telescopic net 12 enters the contracted state.
The material of the first fixing ring 123 and the second fixing ring 124 is stainless steel or cobalt chrome, and the telescopic net 12 can be fixed with the first fixing ring 123 and the second fixing ring 124 in a press-holding manner.
Optionally, a connecting pipe 141 is disposed on one side of the pusher 14 near the valve, the connecting pipe 141 is movably sleeved on the surface of the nitinol tube 15, and a first end of the connecting pipe 141 is fixedly connected with the second fixing ring 124.
In this embodiment, the pusher 14 is fixedly connected to the second end of the expandable mesh 12 through the connecting tube 141, so that the expandable mesh 12 is connected to the pusher 14, and the valve holder 13 is accommodated between the limiting hole 121 of the expandable mesh 12 and the pusher 14.
Wherein, since the valve support 13 has a certain height, a corresponding height needs to be set between the telescopic net 12 and the pusher 14 to adapt to the valve support 13. By providing the connection tube 141 on the propeller 14, the use of the material of the telescopic net 12 can be reduced as much as possible, while the connection of the telescopic net 12 and the propeller 14 is achieved, and at the same time, costs can be saved.
Optionally, the conical head 11 includes a threaded head 111, the threaded head 111 is movably sleeved on the surface of the nitinol tube 15, threads are disposed on the inner side of the conical head 11, and the conical head 11 and the threaded head 111 are fixed through threaded connection.
In the present embodiment, the bit 11 is connected to the nitinol tube 15 by the screw head 111, and the bit 11 can be easily removed and maintained at a fixed strength. The bit 11 may be made of a block polyether amide resin or nylon material, so that an operator can conveniently confirm the position of the bit 11 in the human body.
Optionally, as shown in fig. 4, the device further comprises an inner tube 16, an outer tube 17, a screw 18 and a handle 19, wherein the inner tube 16 is movably sleeved on the surface of the nickel-titanium tube 15, and the outer tube 17 is movably sleeved on the surface of the inner tube 16;
The screw 18 is movably sleeved on the surface of the nickel-titanium tube 15, and the handle 19 is movably sleeved on the surface of the screw 18;
The inner tube 16 is positioned between the screw 18 and the pusher 14, one end of the inner tube 16 is fixedly connected with one side of the pusher 14 away from the valve, and the other end of the inner tube 16 is fixedly connected with the screw 18;
The outer tube 17 is located between the handle 19 and the housing 10, one end of the outer tube 17 is fixedly connected with one side of the housing 10 away from the bit 11, and the other end of the outer tube 17 is fixedly connected with the handle 19.
In this embodiment, when the inner tube 16 and the outer tube 17 are bent in the direction of the blood vessel during transportation, the valve stent 13 is transported to the target position, and then the valve stent 13 is exposed from the inside of the casing 10 away from the conical head 11 by the handle 19, and the release of the valve stent 13 is prepared.
Specifically, as shown in fig. 6, the inner tube 16 and the outer tube 17 are bent along the blood vessel during transportation to deliver the valve stent to the target site. The operator then moves the handle 19 away from the conical head 11, as shown in fig. 7, to expose the valve holder 13. The heart valve is released by moving the nitinol tube 15 to bring the expandable mesh 12 into a contracted state, completing the release process of the whole heart valve.
Wherein the handle 19 effects movement of the housing 10 by rotation with the screw 18.
Alternatively, the outer tube 17 is provided with an outer layer, an intermediate layer and an inner layer, wherein the outer layer is made of a block polyether amide or nylon material, the intermediate layer is made of a stainless steel material, and the inner layer is made of polytetrafluoroethylene material.
In this embodiment, since the outer tube 17 needs to be bendable and also support the valve holder 13 in a certain relative position, the outer tube 17 needs to be made of multiple layers of material to achieve this.
Wherein the outer layer needs to bend relative to the vessel to avoid damaging the vessel during transport of the valve stent 13. The middle layer needs to maintain the overall strength of the outer tube 17, and maintain the valve support 13 in a certain position when the outer tube 17 can convey the valve support 13 while supporting the overall structure. The movable connection of the inner side to the inner tube 16 is required to have a certain lubrication effect to achieve a relative movement of the handle 19 with the housing 10.
Wherein, according to the shape track characteristic of the transportation device in the human body, the hardness of the part of the outer layer structure of the outer tube 17 close to the outer shell 10 is lower, and the hardness of the part of the outer layer structure of the outer shell 10 far from the outer shell 10 is higher.
Optionally, as shown in fig. 4 and 5, the device further comprises a fixing frame 20 and a moving block 21, wherein the fixing frame 20 is movably sleeved on the surface of the nickel-titanium tube 15, and the fixing frame 20 is fixedly connected with one side of the screw 18 far away from the inner tube 16;
The fixed frame 20 is provided with a groove, and the movable block 21 is fixedly connected with the nickel-titanium tube 15 through the groove.
In the present embodiment, the structure of the fixing frame 20 and the moving block 21 facilitates the operator to control the handle 19 and the moving block 21 simultaneously to release the valve support 13.
Wherein, as shown in fig. 6 and 7, the moving block 21 is fixedly connected with the nitinol tube 15, and an operator can move the nitinol tube 15 through the moving block 21, so that the telescopic net 12 enters the contracted state from the expanded state, and release the valve support 13. After release, the retractable mesh 12 and the conical head 11 are retracted to complete the procedure, as shown in fig. 8.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.