Conveyor device

Abstract

The present invention relates to the technical field of medical devices and provides a delivery device. The delivery device includes a body insertion assembly and a handle assembly. Among them, in the radial direction, an annular accommodation space is formed between the outer tube and the inner tube. The stent and the push tube are located in the accommodation space. The stent and the push tube are arranged in sequence along the axial direction, and the push tube can push the stent out of the accommodation space along the axial direction. The inner tube is fixed to the housing, the operation wheel is rotatably connected to the housing, the outer tube connector is fixed to the outer tube, and the outer tube connector is provided with drive teeth distributed along the axial direction of the outer tube and meshed with the first gear for transmission. One end of the push tube facing away from the stent is fixed to the push tube connector, and the push tube connector is provided with drive teeth distributed along the axial direction of the push tube and meshed with the second gear for transmission. The outer tube connector and the push tube connector are placed parallel to each other along the axial direction, and the operation wheel is in transmission connection with the first gear and the second gear. The forward movement of the push tube compensates for the retracted length of the stent pushed out of the outer tube, achieving the purpose of uniformly releasing the stent.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to a delivery device. Background Art

[0002] In endovascular therapy, stent implantation is an important step. Common delivery devices include a body entry component and a handle component. The body entry component includes an outer tube and an inner tube. The outer tube is sleeved outside the inner tube, and the stent is clamped between the two. After the body entry component extends into the blood vessel, the outer tube is retracted through the handle component, while the inner tube remains stationary, so that the stent is exposed, and the stent changes from the self-compressed state to the expanded state to form a support in the blood vessel.

[0003] However, the stent is woven into a cylindrical stent by nickel-titanium wires through a weaving method. Due to the relatively unfixed contact points of the weaving wires, the angle between the weaving wires becomes smaller when the woven stent is installed into the outer tube, the length of the woven stent will increase, and the advancing lengths of woven stents with different diameters when compressed to the same diameter are different. Therefore, when releasing the stent, it is difficult to achieve precise release and uniform release simply by retracting the outer tube.

[0004] Therefore, there is an urgent need for a delivery device to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a delivery device that can uniformly release the stent in the blood vessel.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A delivery device for delivering a stent into the body. The stent is a flexible mesh structure. The delivery device includes:

[0008] A body entry component, which includes an outer tube, an inner tube, and a push tube. The outer tube is sleeved outside the inner tube, and a ring-shaped accommodation space is formed between the outer tube and the inner tube in the radial direction. The stent and the push tube are sleeved outside the inner tube and are located in the accommodation space. The stent and the push tube are arranged in sequence along the axial direction, and the push tube can axially push the stent out of the accommodation space;

[0009] Handle assembly. The above handle assembly includes a housing, an operation wheel, a first gear, a second gear, an outer tube connector, and a top tube connector. An installation cavity is provided inside the housing. The inner tube is fixed to the housing. The operation wheel is rotatably connected to the housing, and a circumferential portion of the operation wheel is exposed on one side of the housing. The outer tube connector is fixed to the outer tube. The outer tube connector is provided with drive teeth distributed along the axial direction of the outer tube and meshes with the first gear for transmission. One end of the top tube facing away from the bracket is fixed to the top tube connector. The top tube connector is provided with drive teeth distributed along the axial direction of the top tube and meshes with the second gear for transmission. The outer tube connector and the top tube connector are placed parallel to each other along the axis. The operation wheel is in transmission connection with the first gear and the second gear.

[0010] As a preferred technical solution of the above conveying device, it further includes a stabilizing tube. The stabilizing tube is sleeved outside the outer tube and is slidably connected to the outer tube. One end of the stabilizing tube is fixed to the housing.

[0011] As a preferred technical solution of the above conveying device, one of the outer tube connector and the top tube connector is provided with a chute, and the other is provided with a slider slidably connected to the chute.

[0012] As a preferred technical solution of the above conveying device, the first gear and the second gear are arranged at a radial interval, and the outer tube connector and the top tube connector are located between the first gear and the second gear.

[0013] As a preferred technical solution of the above conveying device, the first gear and the second gear are connected by a transmission chain for transmission.

[0014] As a preferred technical solution of the above conveying device, one of the first gear and the second gear is coaxially arranged with the operation wheel and is connected to the operation wheel through a transmission shaft.

[0015] As a preferred technical solution of the above conveying device, a non-return spring piece is installed in the installation cavity. One end of the non-return spring piece is fixed to the housing, and the other end abuts against the drive teeth of the outer tube connector or the drive teeth of the top tube connector, so that the operation wheel can only rotate in the clockwise direction or the counterclockwise direction.

[0016] As a preferred technical solution of the above conveying device, it further includes a locking member. The locking member is slidably connected to the housing along the radial direction of the outer tube, and one end of the locking member is exposed outside the housing, and the other end can be inserted into the outer tube connector and the top tube connector along the radial direction of the inner tube.

[0017] As a preferred technical solution of the above-mentioned conveying device, a conical head is connected to one end of the inner tube facing away from the housing, and at least a part of the conical head is located outside the accommodating space.

[0018] As a preferred technical solution of the above-mentioned conveying device, a holding groove is provided on the other side of the housing.

[0019] Advantages of the present invention:

[0020] In the initial state, the stent is in the retracted state and located in the accommodating space. During use, first push the in-body component to the diseased position in the blood vessel in the body, and then rotate the operation wheel. The operation wheel drives the first gear and the second gear to rotate. The first gear meshes with the transmission teeth of the outer tube connector for transmission. As the first gear rotates, the outer tube connector moves axially along the outer tube towards the side away from the outer tube. The outer tube is pulled by the outer tube connector and retracts into the housing, while the inner tube remains stationary. As a result, the sleeved part of the outer tube and the inner tube outside the housing decreases, and the accommodating space shrinks towards the side where the housing is located, causing the stent to be exposed outside the accommodating space. Due to the loss of the restraint of the outer tube, the stent changes from the retracted state to the expanded state and abuts against the inner peripheral wall of the blood vessel.

[0021] Furthermore, when the first gear rotates, the second gear also rotates accordingly. The second gear meshes with the transmission teeth of the push tube connector for transmission. As the second gear rotates, the push tube connector moves axially along the push tube towards the side where the push tube is located, causing the push tube to be able to move along the axial direction of the inner tube away from the housing against the stent. Since the moving directions of the push tube and the outer tube are opposite, it can accelerate the speed at which the stent is exposed from the accommodating space, and the forward movement of the push tube compensates for the retracted length of the stent pushed out of the outer tube, achieving the purpose of uniformly releasing the stent. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the content of the embodiments of the present invention and these drawings.

[0023] Figure 1 It is a schematic structural diagram of the conveying device provided by the embodiment of the present invention;

[0024] Figure 2 It is a schematic structural diagram of the in-body component provided by the embodiment of the present invention;

[0025] Figure 3 It is a schematic structural diagram of the handle assembly provided by the embodiment of the present invention;

[0026] Figure 4 isFigure 3 Local enlargement at A in Figure 1 ;

[0027] Figure 5 is Figure 3 Local enlargement at A in Figure 2 .

[0028] In the figure:

[0029] 10. Bracket;

[0030] 20. Insertion body assembly; 21. Outer tube; 22. Inner tube; 23. Thrust tube; 24. Stabilizing tube; 25. Tapered head; 26. Steel pipe;

[0031] 30. Handle assembly; 31. Housing; 311. Holding groove; 32. Operating wheel; 33. First gear; 34. Second gear; 35. Outer tube connecting piece; 36. Thrust tube connecting piece; 37. Transmission chain; 38. Anti-rebound piece;

[0032] 39. Locking member;

[0033] 40. Luer connector. Specific embodiments

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present invention, rather than limiting the present invention. In addition, it should be noted that for the sake of description, only parts related to the present invention rather than all structures are shown in the accompanying drawings.

[0035] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected" and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0036] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is at a lower horizontal height than the second feature.

[0037] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, 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. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] As Figures 1 to 5 shown, the present application provides a conveying device for conveying the stent 10 into the body. The stent 10 is a flexible mesh structure. The conveying device includes a body entering component 20 and a handle component 30. Among them, the body entering component 20 includes an outer tube 21, an inner tube 22 and a pushing tube 23. The outer tube 21 is sleeved outside the inner tube 22. Radially, an annular accommodating space is formed between the outer tube 21 and the inner tube 22. The stent 10 and the pushing tube 23 are sleeved outside the inner tube 22 and are located in the accommodating space. The stent 10 and the pushing tube 23 are arranged in sequence along the axial direction, and the pushing tube 23 can push the stent 10 out of the accommodating space along the axial direction; the handle component 30 includes a housing 31, an operating wheel 32, a first gear 33, a second gear 34, an outer tube connecting piece 35 and a pushing tube connecting piece 36. An installation cavity is provided inside the housing 31. The inner tube 22 is fixed to the housing 31. The operating wheel 32 is rotatably connected to the housing 31, and a circumferential part of the operating wheel 32 is exposed on one side of the housing 31. The outer tube connecting piece 35 is fixed to the outer tube 21. The outer tube connecting piece 35 is provided with transmission teeth distributed along the axial direction of the outer tube 21 and meshes with the first gear 33 for transmission. One end of the pushing tube 23 facing away from the stent 10 is fixed to the pushing tube connecting piece 36. The pushing tube connecting piece 36 is provided with transmission teeth distributed along the axial direction of the pushing tube 23 and meshes with the second gear 34 for transmission. The outer tube connecting piece 35 and the pushing tube connecting piece 36 are placed parallel to each other along the axial direction. The operating wheel 32 is in transmission connection with the first gear 33 and the second gear 34.

[0039] In the initial state, the stent 10 is in a retracted state and is located in the accommodating space. When in use, first push the body entering component 20 to the diseased position in the blood vessel in the body, and then rotate the operating wheel 32. The first gear 33 and the second gear 34 are driven to rotate by the operating wheel 32. The first gear 33 meshes with the transmission teeth of the outer tube connecting piece 35 for transmission. As the first gear 33 rotates, the outer tube connecting piece 35 moves axially along the outer tube 21 to the side away from the outer tube 21. The outer tube 21 is pulled by the outer tube connecting piece 35 and retracts into the housing 31, while the inner tube 22 remains stationary. As a result, the sleeved part of the outer tube 21 and the inner tube 22 outside the housing 31 decreases, and the accommodating space shrinks toward the side where the housing 31 is located, so that the stent 10 is exposed outside the accommodating space. Due to the loss of the restraint of the outer tube 21, the stent 10 changes from the retracted state to the expanded state and abuts against the inner peripheral wall of the blood vessel.

[0040] Furthermore, when the first gear 33 rotates, the second gear 34 also rotates accordingly. The second gear 34 meshes with and drives the transmission teeth of the pipe jacking connector 36. As the second gear 34 rotates, the pipe jacking connector 36 moves along the axial direction of the pipe jacking 23 towards the side where the pipe jacking 23 is located, causing the pipe jacking 23 to move along the axial direction of the inner pipe 22 away from the housing 31 against the support 10. Since the moving directions of the pipe jacking 23 and the outer pipe 21 are opposite, the speed of the support 10 being exposed from the accommodation space can be increased, and the forward movement of the pipe jacking 23 compensates for the retracted length of the support 10 pushed out of the outer pipe 21, achieving the purpose of evenly releasing the support 10.

[0041] Preferably, the sum of the distance that the outer pipe 21 retracts into the housing 31 and the distance that the pipe jacking 23 advances out of the housing 31 is equal to the axial change length when the support 10 is installed.

[0042] When the outer pipe 21 is retracted into the housing 31, since the outer pipe 21 is in direct contact with the inner peripheral wall of the blood vessel, the outer pipe 21 is subjected to the frictional force of the blood vessel wall, and the releasing force for releasing the support 10 causes the insertion assembly 20 to move closer to the small curvature side of the blood vessel, thereby affecting the positioning of the support 10 in the blood vessel.

[0043] Therefore, the delivery device in this embodiment further includes a stabilizing tube 24. The stabilizing tube 24 is sleeved outside the outer pipe 21 and is slidably connected to the outer pipe 21, and one end of the stabilizing tube 24 is fixed to the housing 31. The stabilizing tube 24 provides a stable passage when the outer pipe 21 retracts into the housing 31 and the pipe jacking 23 advances out of the housing 31, improves the stability of the inserted part, and offsets the moving force causing the outer pipe 21 to move towards the small curvature side of the blood vessel. The stabilizing tube 24 is located between the outer pipe 21 and the blood vessel, and the frictional force between the inner peripheral wall of the stabilizing tube 24 and the outer peripheral wall of the outer pipe 21 is relatively low, which also enables the outer pipe 21 to retract into the housing 31 more smoothly.

[0044] Optionally, one of the outer pipe connector 35 and the pipe jacking connector 36 is provided with a sliding groove, and the other is provided with a sliding block slidably connected to the sliding groove. With this arrangement, the outer pipe connector 35 and the pipe jacking connector 36 support each other, maintaining their relative stability when moving along the axial direction of the inner pipe 22, so as to reduce the relative radial swing, and further ensure that the retraction of the outer pipe 21 into the housing 31 and the pushing and advancing of the pipe jacking 23 out of the housing 31 can all be relatively stable along the axial direction of the inner pipe 22, so as to reduce the influence on the change of the support 10 from the retracted state to the expanded state.

[0045] Optionally, the first gear 33 and the second gear 34 are arranged at a radial interval, and the outer pipe connector 35 and the top pipe connector 36 are located between the first gear 33 and the second gear 34. With such an arrangement, the acting forces applied to the outer pipe connector 35 and the top pipe connector 36 in the radial direction by the first gear 33 and the second gear 34 enable the outer pipe connector 35 and the top pipe connector 36 to further support each other and reduce the radial swing.

[0046] Furthermore, the insertion direction of the slider into the chute is parallel to the connection direction of the first gear 33 and the second gear 34.

[0047] Optionally, the first gear 33 and the second gear 34 are connected by a transmission chain 37. With such an arrangement, the first gear 33 and the second gear 34 can rotate in the same direction. Since the first gear 33 and the second gear 34 are arranged at a radial interval, the meshing of the first gear 33 with the outer pipe connector 35 causes the outer pipe connector 35 to pull the outer pipe 21 into the housing 31, while the meshing of the second gear 34 with the top pipe connector 36 causes the top pipe connector 36 to push the top pipe 23 out of the housing 31.

[0048] Optionally, one of the first gear 33 and the second gear 34 is coaxially arranged with the operating wheel 32 and is connected to the operating wheel 32 through a transmission shaft. In this way, the transmission structure is simplified, and compared with the radial meshing transmission, the axial transmission makes the transmission structure more compact, and further makes the volume of the housing 31 smaller and more convenient to hold.

[0049] Optionally, a non-return spring piece 38 is installed in the installation cavity. One end of the non-return spring piece 38 is fixed to the housing 31, and the other end abuts against the transmission teeth of the outer pipe connector 35 or the transmission teeth of the top pipe connector 36, so that the operating wheel 32 can only rotate in the clockwise direction or the counterclockwise direction. In this embodiment, the operating wheel 32 rotates in the clockwise direction. Thus, when the operating wheel 32, the first gear 33 and the second gear 34 rotate clockwise, the transmission teeth of the outer pipe connector 35 or the transmission teeth of the top pipe connector 36 can push the non-return spring piece 38, causing the non-return spring piece 38 to undergo elastic deformation, and then allowing the transmission teeth to move relative to it. However, when the operating wheel 32, the first gear 33 and the second gear 34 rotate counterclockwise, the transmission teeth of the outer pipe connector 35 or the transmission teeth of the top pipe connector 36 abut against the non-return spring piece 38 in the axial direction of the inner pipe 22 and are thus locked.

[0050] Since the peripheral side of the operating wheel 32 is at least partially exposed outside the shell 31, the conveying device is very likely to accidentally touch the operating wheel 32 during transportation or when grasping, causing it to rotate, thereby exposing the bracket 10 outside the accommodating space, requiring readjustment, or the product is scrapped due to the contamination of the bracket 10. Therefore, the conveying device in this embodiment also includes a locking member 39, which is slidably connected to the shell 31 along the radial direction of the outer tube 21, and one end of the locking member 39 is exposed outside the shell 31, and the other end can be plugged with the outer tube connector 35 and the top tube connector 36 along the radial direction of the inner tube 22. In this way, when not in use, the locking member 39 is plugged with the outer tube connector 35 and the top tube connector 36 along the radial direction of the inner tube 22 to limit the relative movement of the outer tube connector 35 and the top tube connector 36 along the axial direction of the inner tube 22, thereby maintaining the initial state of the factory. When in use, the locking member 39 is pulled out to release the lock.

[0051] Optionally, one end of the locking member 39 located in the housing 31 abuts against one end of the outer tube connector 35 facing away from the outer tube 21 and is plugged into the top tube connector 36. Alternatively, one end of the locking member 39 located in the housing 31 abuts against one end of the top tube connector 36 facing away from the top tube 23 and is plugged into the outer tube connector 35.

[0052] Optionally, the end of the inner tube 22 facing away from the housing 31 is connected with a conical head 25, and the conical head 25 is at least partially located outside the accommodating space. When the in-body assembly 20 is inserted into the body, the conical head 25 can gradually expand the blood vessels, so that the subsequent outer tube 21 can be smoothly inserted.

[0053] Optionally, a gripping groove 311 is provided on the other side of the housing 31. Generally, when the operator is holding the housing 31, his thumb and index finger are clamped on opposite sides of the housing 31, respectively. Therefore, in this embodiment, the peripheral side of the operating wheel 32 is exposed to one side of the housing 31 to facilitate thumb operation, and a gripping groove 311 is provided on the other side of the housing 31 to provide support for the index finger, so that the operator can hold the conveying device more stably during operation.

[0054] Optionally, the inner tube 22 passes through the installation cavity, and the end of the inner tube 22 facing away from the conical head 25 is connected to a Luer connector 40 .

[0055] Optionally, a steel pipe 26 is sleeved on a portion of the inner tube 22 in the installation cavity.

[0056] Furthermore, the inner tube 22 is connected to the steel tube 26 , the steel tube 26 is connected to the tail end Luer, and the tail end Luer is fixed to the shell 31 .

[0057] Furthermore, for easy installation, the housing 31 includes an upper cover and a lower cover that can be buckled together.

[0058] In addition, the above are only the preferred embodiments of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A delivery device for delivering a stent (10) into the body, wherein the stent (10) is a flexible mesh structure, characterized in that, The conveying device comprises: An entry component (20), the entry component (20) comprising an outer tube (21), an inner tube (22) and a top tube (23), the outer tube (21) being sleeved outside the inner tube (22), and in a radial direction, an annular accommodation space is formed between the outer tube (21) and the inner tube (22), the bracket (10) and the top tube (23) being sleeved outside the inner tube (22) and located in the accommodation space, the bracket (10) and the top tube (23) being arranged in sequence along the axial direction, and the top tube (23) being capable of pushing the bracket (10) out of the accommodation space along the axial direction; A handle assembly (30), the handle assembly (30) comprising a housing (31), an operating wheel (32), a first gear (33), a second gear (34), an outer tube connector (35) and a top tube connector (36), the housing (31) being provided with a mounting cavity, the inner tube (22) being fixed to the housing (31), the operating wheel (32) being rotatably connected to the housing (31), and a peripheral portion of the operating wheel (32) being exposed at one side of the housing (31), the outer tube connector (35) being fixed to the outer tube (21), and the outer tube connector (36) being The connecting piece (35) is provided with transmission teeth distributed along the axial direction of the outer tube (21) and meshing with the first gear (33) for transmission; the end of the top tube (23) facing away from the bracket (10) is fixed to the top tube connecting piece (36); the top tube connecting piece (36) is provided with transmission teeth distributed along the axial direction of the top tube (23) and meshing with the second gear (34) for transmission; the outer tube connecting piece (35) and the top tube connecting piece (36) are placed parallel to each other along the axial direction; and the operating wheel (32) is transmission-connected with the first gear (33) and the second gear (34); One of the outer tube connector (35) and the top tube connector (36) is provided with a slide groove, and the other is provided with a sliding block slidably connected to the slide groove; The first gear (33) and the second gear (34) are connected in transmission via a transmission chain (37); The mounting cavity is provided with a non-return spring sheet (38), one end of which is fixed to the housing (31), and the other end of which is in contact with the transmission teeth of the outer tube connector (35) or the transmission teeth of the top tube connector (36), so that the operating wheel (32) can only rotate in a clockwise direction or a counterclockwise direction; The invention also comprises a locking member (39), wherein the locking member (39) is slidably connected to the shell (31) along the radial direction of the outer tube (21), and one end of the locking member (39) is exposed outside the shell (31), and the other end can be plugged into the outer tube connector (35) and the top tube connector (36) along the radial direction of the inner tube (22).

2. The conveying device according to claim 1, characterized in that, It also includes a stabilizing tube (24), which is sleeved outside the outer tube (21) and slidably connected to the outer tube (21), and one end of the stabilizing tube (24) is fixed to the shell (31).

3. The conveying device according to claim 1, characterized in that, The first gear (33) and the second gear (34) are arranged at a radial interval, and the outer pipe connector (35) and the top pipe connector (36) are located between the first gear (33) and the second gear (34).

4. The conveying device according to claim 1, characterized in that, One of the first gear (33) and the second gear (34) is coaxially arranged with the operating wheel (32) and is connected to the operating wheel (32) through a transmission shaft.

5. The conveying device according to claim 1, wherein One end of the inner pipe (22) facing away from the housing (31) is connected with a conical head (25), and at least a part of the conical head (25) is located outside the accommodating space.

6. The conveying device according to any one of claims 1-5, characterized in that, A holding groove (311) is arranged on the other side of the housing (31).

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