HIGHLY RETRACTABLE INTRAVASCULAR STENT CONVEYING SYSTEM

• US 20170172773A1
• Filed: 05/19/2015
• Published: 06/22/2017
• Est. Priority Date: 05/21/2014
• Status: Active Grant

• Current Assignee: Suzhou Innomed Medical Device Co., Ltd.
• Original Assignee: Suzhou Innomed Medical Device Co., Ltd.
• Inventors: Gong, Xiaoyan Shawn, Zhou, Xiang, Xue, Guanhua, Zhou, Weikun, Qiu, Pengchong
• Granted Patent: US 10,292,848 B2
• Time in Patent Office: Days
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/9517 handle assemblies therefor
• CPC Class Codes: A61F 2/962 having an outer sleeve
• CPC Class Codes: A61F 2/966 with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
• CPC Class Codes: A61F 2002/9665 with additional retaining means
• CPC Class Codes: A61M 25/00 Catheters; Hollow probes dilators A61M29/00; peritoneal catheters A61M1/285; tracheal tubes A61M16/04; for drainage A61M27/00; for uterus, vagina or rectum A61M31/00 ; for measuring or testing A61B; materials for catheters A61L29/00
• CPC Class Codes: A61M 25/0102 Insertion or introduction using an inner stiffening member, e.g. stylet or push-rod

Abstract

A highly retractable intravascular stent delivery system, including a tube assembly and a rotation driving assembly. The tube assembly includes an outer tube 5, an intermediate tube 6, and inner tube 7, wherein an intravascular stent 3 and a stent retaining block 4 are provided within the outer tube 5. The rotation driving assembly includes a housing 9, an outer screw 19, and an intermediate screw 14 located within the housing 9, as well as a driving member. The driving member allows two screws to rotate at opposite directions, so as to drive the outer tube 5 to move toward the proximal end, and the intermediate tube 6 pushes the stent retaining block 4 and the intravascular stent 3 to move toward the distal end. The system uses three-lay tube structure and uses driving gear to drive two screws to move at directions opposite to each other, such that the intermediate tube 6 and the outer tube 5 are driven to move to directions opposite to each other. Therefore, the axial retraction of the intravascular stents can be effectively offset and axial movement of the intravascular stents due to axial retraction of the intravascular stents is avoided, thereby accurately implanting the stents into the body.

Claims

1. A highly retractable intravascular stent delivery system, including a tube assembly and a rotation driving assembly, wherein, the tube assembly extends into the rotation driving assembly and is driven by the rotation driving assembly,

wherein the tube assembly includes an outer tube 5, an intermediate tube 6 disposed within the outer tube 5, and an inner tube 7 disposed within the intermediate tube 6, wherein the inner tube 7 includes a hollow channel through which guide wires pass;

the delivery system is introduced to the target treatment area by the guide wires, and the outer tube 5 includes an intravascular stent loading area within which the intravascular stent 3 is placed; and

a stent retaining block 4 is abutted against the proximal end of the intravascular stent 3, the stent retaining block 4 is fixed on the distal end of the intermediate tube 6;

the distal end of the inner tube 7 passes through the inner cavity of the stent retaining block 4 and the intravascular stent 3 and extends out of the distal surface of the outer tube 5;

the rotation driving assembly includes a housing 9, an outer screw 19 and an intermediate screw 14 disposed within the housing 9 and a driving member for driving the outer screw 19 and the intermediate screw 14 to rotate, wherein outer threads are provided on the outer surface of the outer screw 19 that is threadably connected to an outer screw jaw 21, and the outer screw jaw 21 is non-movably connected to the outer tube 5 through a connection tube for outer tube 13;

outer threads are provided on the outer surface of the intermediate screw 14 that is threadably connected to an intermediate screw jaw 16, and the intermediate screw jaw 16 is non-movably connected to the intermediate tube 6 through a connection tube for intermediate tube 22;

the outer screw 19 and the intermediate screw 14 are respectively provided with left hand threads and right hand threads that are opposite to each other;

the driving member drives the outer screw 19 and the intermediate screw 14 to rotate in opposite direction, and the rotation of the outer screw 19 drives the outer screw jaw 21 to move to the proximal end; and

the rotation of the intermediate screw 14 drives the intermediate screw jaw 16 to move to the distal end, such that the intermediate tube 6 drives the stent retaining block 4 and the intravascular stent 3 to move to the distal end.

2. The highly retractable intravascular stent delivery system of claim 1, wherein the driving member includes a manual knob 11 for driving the rotation of a driving gear 18 positioned outside of the housing 9, and an entire rotation handle assembly rotatably disposed within the housing 9;

the entire rotation handle assembly includes the driving gear 18 located at the proximal end within the housing 9, an outer screw driven wheel 23 and an intermediate screw driven wheel 17, which are fitted with the driving gear 18;

the outer screw driven wheel 23 is non-movably connected to the proximal end of the outer screw 19, and the intermediate screw driven wheel 17 is non-movably connected to the proximal end of the intermediate screw 14.

3. The highly retractable intravascular stent delivery system of claim 1, wherein the driving member includes a second motor 30 disposed at the end of the outer screw 19, a first motor 28 disposed at the end of the intermediate screw 14 and a switch 29 disposed outside of the housing 9 for controlling the second motor 30 and the first motor 28.

4. The highly retractable intravascular stent delivery system of claim 3, wherein the thread pitch of the left hand threads provided on the outer screw 19 is different from that of the right hand threads provided on the intermediate screw 14.

5. The highly retractable intravascular stent delivery system of claim 1, wherein a locking screw 10 is configured at the distal end outside of the housing 9.

6. The highly retractable intravascular stent delivery system of claim 1, wherein a guide groove for outer screw jaw 24 is configured within the housing 9, a connection apparatus for outer screw jaw 20 is configured on the outer screw jaw 21, such that the outer screw jaw 21 moves along the guide groove for outer screw jaw 24, a guide groove for intermediate screw jaw 25 is also configured within the housing 9, a connection apparatus for intermediate screw jaw 15 is configured on the intermediate screw jaw 16, such that the intermediate screw jaw 16 moves along the guide groove for intermediate screw jaw 25.

7. The highly retractable intravascular stent delivery system of claim 1, wherein

a groove 27 is formed on the outer wall of the connection tube for outer tube 13, adjacent to the intermediate screw jaw 16, for readily pushing the connection tube for intermediate tube 22.

8. The highly retractable intravascular stent delivery system of claim 1, wherein a tube sleeve 26 is non-movably disposed at the proximal end of the inner tube 7, such that guide wires extend into the inner tube 7 through the tube sleeve 26.

9. The highly retractable intravascular stent delivery system of claim 1, wherein a guide tube is disposed at the proximal end of the tube assembly, which is air-tightly connected to the tube assembly, and a cleaning valve 12 is air-tightly and non-movably connected to the end of the guide tube.

10. The highly retractable intravascular stent delivery system of claim 1, wherein a hemostasis ring is disposed at the proximal end of the tube assembly.

11. A highly retractable intravascular stent delivery system, including a tube assembly and a rotation driving assembly, wherein, the tube assembly extends into the rotation driving assembly and is driven by the rotation driving assembly,

wherein the tube assembly includes an outer tube 5, an intermediate tube 6 and an inner tube 7, which are gradually sleeved to each other, wherein the inner tube 7 includes a hollow channel through which guide wires pass;

an intravascular stent 3 is disposed between the outer tube 5 and the inner tube 7, which is located at the distal end of the intermediate tube 6;

the rotation driving assembly includes a housing 9, an outer screw 19 and an intermediate screw 14 disposed within the housing 9, and a driving member for driving the outer screw 19 and the intermediate screw 14 to rotate, wherein, the outer screw 19 and the intermediate screw 14 are configured to be parallel with each other, left hand threads and right threads which are opposite to each other are provided on the outer screw 19 and the intermediate screw 14, the driving member drives the outer screw 19 and the intermediate screw 14 to rotate at directions opposite to each other, such that the outer screw 19 drives the outer tube 5 to move toward the proximal end, and the intermediate screw 14 drives the intermediate tube 6 to move toward the distal end, and further the intermediate tube 6 pushes the intravascular stent 3 to move toward the distal end.

12. The highly retractable intravascular stent delivery system of claim 11, wherein the outer tube 5 includes an intravascular stent loading area within which the intravascular stent 3 is placed;

a stent retaining block 4 is abutted against the proximal end of the intravascular stent 3, the stent retaining block 4 is fixed on the distal end of the intermediate tube 6;

the distal end of the inner tube 7 passes through the inner cavity of the stent retaining block 4 and the intravascular stent 3, and extends out of the distal surface of the outer tube 5.

13. The highly retractable intravascular stent delivery system of claim 11, wherein outer threads are provided on the outer surface of the outer screw 19 that is threadably connected to an outer screw jaw 21, the outer screw jaw 21 is non-movably connected to the outer tube 5 through a connection tube for outer tube 13;

outer threads are provided on the outer surface of the intermediate screw 14 that is threadably connected to an intermediate screw jaw 16, the intermediate screw jaw 16 is non-movably connected to the intermediate tube 6 through a connection tube for intermediate tube 22;

the rotation of the outer screw 19 drives the outer screw jaw 21 to move toward the proximal end and the rotation of the intermediate screw 14 drives the intermediate screw jaw 16 to move toward the distal end.

14. The highly retractable intravascular stent delivery system of claim 11, wherein the driving member includes a manual knob 11 for driving the rotation of a driving gear 18, which is positioned outside of the housing 9, and an entire rotation handle assembly rotatably disposed within the housing 9, wherein the entire rotation handle assembly includes a driving gear 18 located at the proximal end within the housing 9, an outer screw driven wheel 23 and an intermediate screw driven wheel 17, which are fitted with the driving gear 18;

the outer screw driven wheel 23 is non-movably connected to the proximal end of the outer screw 19, and the intermediate screw driven wheel 17 is non-movably connected to the proximal end of the intermediate screw 14.

15. The highly retractable intravascular stent delivery system of claim 11, wherein the driving member includes a second motor 30 disposed at the end of the outer screw 19, a first motor 28 disposed at the end of the intermediate screw 14 and a switch 29 disposed outside of the housing 9 for controlling the second motor 30 and the first motor 28.

16. A highly retractable intravascular stent delivery system, including a tube assembly and a rotation driving assembly, wherein, the tube assembly extends into the rotation driving assembly and is driven by the rotation driving assembly,

wherein the tube assembly includes an outer tube 5, an intermediate tube 6 disposed within the outer tube 5, and an inner tube 7 disposed within the intermediate tube 6, wherein the inner tube 7 includes a hollow channel through which guide wires pass, the delivery system is introduced to the target treatment area by the guide wires, and the outer tube 5 includes an intravascular stent loading area within which the intravascular stent 3 is placed;

and a stent retaining block 4 is abutted against the proximal end of the intravascular stent 3, the stent retaining block 4 is fixed to the distal end of the intermediate tube 6;

the distal end of the inner tube 7 passes through the inner cavity of the stent retaining block 4 and the intravascular stent 3 and extends out of the distal surface of the outer tube 5;

the rotation driving assembly includes a housing 9, an outer screw 19 or an intermediate screw 14 disposed within the housing 9 and a driving member for driving the outer screw 19 or the intermediate screw 14 to rotate, wherein outer threads are provided on the outer surface of the outer screw 19 that is threadably connected to an outer screw jaw 21, and the outer screw jaw 21 is non-movably connected to the outer tube 5 through a connection tube for outer tube 13;

outer threads are provided on the outer surface of the intermediate screw 14 that is threadably connected to an intermediate screw jaw 16, and the intermediate screw jaw 16 is non-movably connected to the intermediate tube 6 through a connection tube for intermediate tube 22;

the driving member drives respectively the outer screw 19 or the intermediate screw 14 to rotate in directions opposite to each other, and the rotation of the outer screw 19 drives the outer screw jaw 21 and the outer tube 5 to move to the proximal end; and

the rotation of the intermediate screw 14 drives the intermediate screw jaw 16 and the intermediate tube 6 to move to the distal end.

17. The highly retractable intravascular stent delivery system of claim 16, wherein the driving member includes a manual knob 11 for driving the rotation of a driving gear 18, which is positioned outside of the housing 9, and an entire rotation handle assembly rotatably disposed within the housing 9, wherein the entire rotation handle assembly includes a driving gear 18 located at the proximal end within the housing 9, a driven wheel for the outer screw 23 and a driven wheel for the intermediate screw 17, which are fitted with the driving gear 18;

the driven wheel for the outer screw 23 is non-movably connected to the proximal end of the outer screw 19, and the driven wheel for the intermediate screw 17 is non-movably connected to the proximal end of the intermediate screw 14.

18. The highly retractable intravascular stent delivery system of claim 16, wherein the driving member includes a second motor 30 disposed at the end of the outer screw 19, a first motor 28 disposed at the end of the intermediate screw 14 and a switch 29 disposed outside of the housing 9 for controlling the second motor 30 and the first motor 28.