CN210147898U

CN210147898U - Fixture for heat setting of nickel-titanium alloy intravascular stent

Info

Publication number: CN210147898U
Application number: CN201921011221.3U
Authority: CN
Inventors: 李楠希; 程海鹰; 冯海全; 永亮
Original assignee: Inner Mongolia University of Technology
Current assignee: Inner Mongolia University of Technology
Priority date: 2019-07-01
Filing date: 2019-07-01
Publication date: 2020-03-17
Anticipated expiration: 2029-07-01

Abstract

The utility model discloses a nickel titanium alloy frock clamp for vascular support heat setting, it belongs to intervene medical instrument processing field for the expansion nickel titanium alloy vascular support, it is hard to solve the expansion, and bearing structure is difficult for getting into support inner chamber, problem that heat treatment efficiency is low. The expansion shaft type self-propelled telescopic bed mainly comprises a base, a left side support, an expansion shaft, a left side end cover, a lining plate, a right side end cover, a propelling shaft and a right side support. The beneficial effect of this anchor clamps: the rotary propulsion is adopted, the labor is saved compared with the linear propulsion, the two end faces of the lining plate are designed into the inclined planes with certain gradients, the propulsion shaft can conveniently enter the support, the separable narrow and long support structure is adopted, the heat treatment of a plurality of metal vascular supports can be carried out at one time, and the heat treatment efficiency is improved. Only need take out the opening packing ring during loading and unloading, promote clamping efficiency, easy operation is swift, and the practicality is strong.

Description

Fixture for heat setting of nickel-titanium alloy intravascular stent

Technical Field

The utility model relates to an intervene medical instrument processing field, in particular to nickel titanium alloy frock clamp for vascular support heat setting.

Background

In recent years, the number of deaths caused by cardiovascular diseases is increased year by year, the mortality rate is higher than that of tumors and other diseases, the deaths are the first in China and become healthy first killers, and at present, intracavity stent implantation is the most common method for treating cardiovascular and cerebrovascular diseases. The metal stent takes biomedical metal or alloy as a raw material, wherein the nickel-titanium alloy has the characteristics of good shape memory effect, superelasticity, lower magnetization coefficient and small influence on magnetic resonance imaging. It is often used to treat stenotic lesions such as intracranial artery, carotid artery, thoracic and abdominal aorta, lower extremity artery, etc.

In order to save cost, the nitinol metal stent generally adopts a thin tube to be subjected to laser cutting treatment, and then is subjected to expansion and heat treatment for several times so as to reach the required size. When the nickel-titanium alloy metal blood vessel stent is expanded, due to the memory property, the plastic deformation of martensite and austenite can be realized only by depending on the temperature change. At present, one end of the nickel-titanium alloy metal stent is inserted into a metal vascular stent for expansion in production, and the nickel-titanium alloy metal stent has higher rigidity and larger friction force with the wall of the metal vascular, so that the force is hard to push, and the cylinder is not easy to enter. In addition, for some thin-diameter nickel-titanium alloy intravascular stents, the corresponding expanded cylinders are thin, and in the insertion process, the uniform stress cannot be guaranteed by hands, so that the cylinders are easy to deform and bend, the machining efficiency is low, and the requirements of common machine tool fixtures cannot be met. Therefore, the nickel-titanium alloy tool clamp for the heat setting of the intravascular stent is provided.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel nickel titanium alloy frock clamp for vascular support heat setting, solve the problem that the background art mentioned.

In order to achieve the above object, the utility model provides a following technical scheme:

nickel-titanium alloy is frock clamp for vascular support heat setting mainly includes: the device comprises a base, a left side support, an expansion shaft, a left side end cover, a lining plate, a right side end cover, a propulsion shaft and a right side support, wherein the left side support and the right side support are installed at the upper end of the base and are fixed through bolts; right side support one end is articulated mutually through the cylindric lock with the right side end cover, and the other end passes through second bolt and second open washer fixed connection with the right side end cover, the expansion axle inserts from the junction of left side support and left side end cover, and the right-hand member is the screw thread axle, the outer terminal surface mounting welt of screw thread axle, the welt overcoat has nickel titanium alloy blood vessel support, the propulsion axle inserts from right side support and right side end cover junction, and the axle center processing has the internal thread, and the propulsion axle left end carries out threaded connection through internal thread and screw thread axle.

Further, the upper end of the left side support is provided with a transverse semicircular groove and a longitudinal semicircular groove, the lower end of the left side end cover is provided with a transverse semicircular groove and a longitudinal semicircular groove, the transverse semicircular groove and the transverse semicircular groove form a circular hole, an expansion shaft is inserted into the circular hole, the longitudinal semicircular groove and the longitudinal semicircular groove form a circular hole, and a cylindrical pin is inserted into the circular hole.

Furthermore, a blind hole is drilled in the expansion shaft, and the end part of the cylindrical pin is inserted into the blind hole.

Further, left side end cover front end is equipped with first U type groove, first bolt passes left side support and first U type groove and presss from both sides the left side support and left side end cover clamp fixedly, install first split washer on the first bolt, first split washer is placed in first U type groove upper end, first split washer external diameter is greater than first U type inslot width, the nut is installed to first bolt upper end, and the external circle diameter of nut is less than first U type inslot width.

Furthermore, a semicircular groove is formed in the upper end of the right side support, a semicircular groove is formed in the lower end of the right side end cover, a circular hole is formed between the semicircular groove and the semicircular groove, and a propelling shaft is inserted into the circular hole and is rotatably connected with the circular hole.

Further, right side end cover front end is equipped with second U type groove, the second bolt passes right side support and second U type groove and presss from both sides right side support and right side end cover fastening and decide, install second opening packing ring on the second bolt, second opening packing ring is placed in second U type groove upper end, second opening packing ring external diameter is greater than second U type inslot width, the nut is installed to second bolt upper end, and the external circle diameter of nut is less than second U type inslot width.

Furthermore, the lining plate is a hollow cylinder formed by three arc-shaped cylinders, the inner diameter of the hollow cylinder formed by the three arc-shaped cylinders is equal to that of the nickel-titanium alloy intravascular stent, and inner chamfers are arranged at the front ends of the inner side walls of the two ends of the lining plate.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the propulsion shaft adopts screw thread precession, and is more labor-saving compared with linear propulsion because of rotary motion.

2. The two end parts of the lining plate are inclined planes with certain gradient, and the left end of the propulsion shaft and the left end of the expansion shaft are cones with certain gradient, so that the propulsion shaft can easily enter the inner cavity of the nickel-titanium metal intravascular stent.

3. The support and the end covers are arranged on two sides of the pushing shaft, the pushing shaft and the expansion shaft are respectively positioned in holes formed by the support and the end cover on the two sides, and in the screwing process of the pushing shaft, the axis of the pushing shaft and the axis of the expansion shaft are always ensured to be on the same horizontal line, so that the bending deformation of the expansion shaft caused by uneven force application when the pushing shaft is rotated by hands is avoided.

4. The separable structure is adopted, the whole body formed by the expansion shaft, the lining plate, the expanded nickel-titanium alloy intravascular stent and the propulsion shaft can be independently taken down for heat treatment, the whole clamp does not need to be placed in a heat treatment furnace, and the space is saved. The expansion shaft, the lining plate, the expanded nickel-titanium alloy intravascular stent and the propulsion shaft form a whole body in a narrow and long structure, the occupied space is small, more nickel-titanium alloy intravascular stents can be subjected to one-time heat treatment, and the heat treatment efficiency is improved. In addition, both sides end cover U type groove size all is greater than the nut circumcircle diameter of fixed end cover, only needs to unscrew the nut, takes off the opening packing ring, and both sides end cover can be opened, promotes the clamping efficiency of heat treatment part, and the heat treatment part is the whole that expansion shaft, welt, after the expansion nickel titanium alloy intravascular stent and propulsion shaft constitute.

Drawings

FIG. 1 is a schematic view of the overall structure of a nickel-titanium alloy intravascular stent after being clamped by a fixture for heat setting of the metallic intravascular stent to be expanded;

FIG. 2 is a schematic view of the supporting structure of the jig for heat setting the nickel-titanium alloy stent of the present invention;

FIG. 3 is a partial cross-sectional view of a front view of a tool holder for heat-setting a nickel-titanium alloy stent according to the present invention;

FIG. 4 is a schematic view of the expansion shaft of the jig for heat setting of the nickel-titanium alloy stent of the present invention;

FIG. 5 is a cross-sectional view of the nickel-titanium alloy intravascular stent of the present invention after being spliced by the jig lining board for heat setting;

FIG. 6 is a schematic structural view of a liner plate of a jig for heat setting a nickel-titanium alloy vascular stent of the present invention;

fig. 7 is the overall structure schematic diagram of the nickel-titanium alloy intravascular stent after expansion by the tool clamp for heat setting.

In the figure: 1. a base; 2. a left side bracket; 21. a transverse semicircular groove; 22. a longitudinal semicircular groove; 3. an expansion shaft; 31. blind holes; 32. a threaded shaft; 4. a left end cap; 41. a transverse semicircular groove; 42; a longitudinal semicircular groove; 43. a first U-shaped groove; 5. a cylindrical pin; 6. a first split washer; 61. a second split washer; 7. the nickel-titanium alloy intravascular stent is to be expanded; 8. a liner plate; 81, inner chamfering; 9. a right side end cap; 91. a semicircular groove; 92. a second U-shaped groove; 10. a propeller shaft; 101. an internal thread; 11. a right side bracket; 111. a semicircular groove; 12. a first bolt; 121. and a second bolt.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.

As shown in fig. 1-7, the utility model relates to a nickel titanium alloy frock clamp for vascular stent heat setting mainly includes: the device comprises a base 1, a left side bracket 2, an expansion shaft 3, a left side end cover 4, a lining plate 8, a right side end cover 9, a propulsion shaft 10 and a right side bracket 11, wherein the left side bracket 2 and the right side bracket 11 are installed at the upper end of the base 1 and are fixed through bolts, one end of the left side bracket 2 is hinged with the left side end cover 4 through a cylindrical pin, and the other end of the left side bracket 2 is fixedly connected with the left side end cover 4 through a first bolt 12 and a first open gasket 6; right side support 11 one end is articulated mutually through the cylindric lock with right side end cover 9, the other end passes through second bolt 121 and second split washer 61 fixed connection with right side end cover 9, expansion shaft 3 inserts from the junction of left side support 2 and left side end cover 4, and the right-hand member is threaded shaft 32, the outer terminal surface mounting welt 8 of threaded shaft 32, welt 8 overcoat has nickel titanium alloy intravascular stent 7, propulsion shaft 10 inserts from the junction of right side support 11 and right side end cover 9, and the axle center processing has internal thread 101, propulsion shaft 10 left end carries out threaded connection through internal thread 101 and threaded shaft 32.

The upper end of left side support 2 is equipped with horizontal semicircle recess 21 and vertical semicircle recess 22, and left side end cover 4 lower extreme is equipped with horizontal semicircle recess 41 and vertical semicircle recess 42, and horizontal semicircle recess 21 and horizontal semicircle recess 41 form the round hole, insert expansion shaft 3 in this round hole, and vertical semicircle recess 22 and vertical semicircle recess 42 form the round hole, insert cylindric lock 5 in this round hole.

The expanding shaft 3 is drilled with a blind hole 31, and the end of the cylindrical pin 5 is inserted into the blind hole 31.

The front end of the left end cover 4 is provided with a first U-shaped groove 43, a first bolt 12 penetrates through the left support 2 and the first U-shaped groove 43 to clamp and fix the left support 2 and the left end cover 4, a first opening washer 6 is mounted on the first bolt 12, the first opening washer 6 is placed at the upper end of the first U-shaped groove 43, the outer diameter of the first opening washer 6 is larger than the inner width of the first U-shaped groove 43, a nut is mounted at the upper end of the first bolt 12, and the diameter of the outer circle of the nut is smaller than the inner width of the first U-shaped groove 43.

The upper end of the right side bracket 11 is provided with a semicircular groove 111, the lower end of the right side end cover 9 is provided with a semicircular groove 91, the semicircular groove 111 and the semicircular groove 91 form a circular hole, and a propelling shaft 10 is inserted into the circular hole and is rotatably connected with the circular hole.

The front end of the right side end cover 9 is provided with a second U-shaped groove 92, a second bolt 121 penetrates through the right side support 11 and the second U-shaped groove 92 to clamp and fix the right side support 11 and the right side end cover 9, a second opening washer 61 is mounted on the second bolt 121, the second opening washer 61 is placed at the upper end of the second U-shaped groove 92, the outer diameter of the second opening washer 61 is larger than the inner width of the second U-shaped groove 92, a nut is mounted at the upper end of the second bolt 121, and the diameter of the circumscribed circle of the nut is smaller than the inner width of the second U-shaped groove 92.

The lining plate 8 is a hollow cylinder formed by three arc-shaped cylinders, the inner diameter of the hollow cylinder formed by the three arc-shaped cylinders is equal to that of the nickel-titanium alloy intravascular stent 7, and the front ends of the inner side walls of the two ends of the lining plate 8 are provided with inner chamfers 81.

Example (b): sleeving a lining plate 8 on the outer surface of a threaded shaft 32 on an expansion shaft 3, temporarily fixing, sleeving a nickel-titanium alloy support 7 to be expanded on the outer surface of the lining plate 8, inserting a cylindrical pin 5 into a left blind hole 31 of the expansion shaft 3, opening a left end cover 4, placing the expansion shaft 3 in a round hole formed by a transverse semicircular groove 21 and a transverse semicircular groove 41, enabling the cylindrical pin 5 to be positioned in the round hole formed by a longitudinal semicircular groove 22 and a longitudinal semicircular groove 42, closing the left end cover 4, placing a first opening gasket 6 at the upper end of a first U-shaped groove 43 of the left end cover 4, installing a first bolt 12 in a hole at the front end of a left support 2 and passing through an inner groove of the first opening gasket 6, screwing a nut, tightly pressing the left end cover 4, opening a right side pressing plate 9, placing a propulsion shaft 10 in the round hole formed by a semicircular groove 111 and a semicircular groove 91, rotating the propulsion shaft 10, and enabling the threaded shaft 32 on the expansion shaft 3 to be screwed into one part in, closing the right end cover 9, placing the second open washer 61 on the upper end of the second U-shaped groove 92 of the right end cover 9, installing the second bolt 121 in the hole at the front end of the right bracket 11 and passing through the inner groove of the second open washer 61, then screwing the nut, rotating the propulsion shaft 10 until the propulsion shaft is rotated to the leftmost position of the threaded shaft 32 and stopped. The nuts at the upper ends of the left side end cover 4 and the right side end cover 9 are unscrewed, the first opening washer 6 and the second opening washer 61 are respectively taken down, and the left side end cover 4 and the right side end cover 9 can be opened without taking down the nuts because the sizes of the two U-shaped grooves at the front ends of the left side end cover 4 and the right side end cover 9 are larger than the sizes of the nuts. The whole body consisting of the lining plate 8, the nickel-titanium alloy intravascular stent 7 to be expanded, the expansion shaft 3 and the propulsion shaft 10 is taken out and put into a heat treatment furnace for heat treatment. After the heat treatment, the expanding shaft 3 is fixed, the propelling shaft 10 is rotated reversely, the propelling shaft 10 can be taken out, and then the lining plate 8 is taken down.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. Nickel-titanium alloy is frock clamp for vascular support heat setting mainly includes: base (1), left side support (2), expansion axle (3), left side end cover (4), welt (8), right side end cover (9), propulsion axle (10) and right side support (11), its characterized in that: a left side support (2) and a right side support (11) are installed at the upper end of the base (1) and fixed through bolts, one end of the left side support (2) is hinged with the left side end cover (4) through a cylindrical pin, and the other end of the left side support is fixedly connected with the left side end cover (4) through a first bolt (12) and a first opening gasket (6); right side support (11) one end is articulated mutually through the cylindric lock with right side end cover (9), and the other end passes through second bolt (121) and second opening packing ring (61) fixed connection with right side end cover (9), expansion shaft (3) are inserted from the junction of left side support (2) and left side end cover (4), and the right-hand member is threaded shaft (32), outer terminal surface installation welt (8) of threaded shaft (32), welt (8) overcoat has nickel titanium alloy vascular support (7), propulsion shaft (10) are inserted from right side support (11) and right side end cover (9) junction, and the axle center processing has internal thread (101), and propulsion shaft (10) left end carries out threaded connection through internal thread (101) and threaded shaft (32).

2. The nickel-titanium alloy intravascular stent tooling clamp for heat setting according to claim 1, characterized in that: the upper end of left side support (2) is equipped with horizontal semicircular groove (21) and vertical semicircular groove (22), left side end cover (4) lower extreme is equipped with horizontal semicircular groove (41) and vertical semicircular groove (42), horizontal semicircular groove (21) and horizontal semicircular groove (41) form the round hole, insert expansion shaft (3) in this round hole, vertical semicircular groove (22) and vertical semicircular groove (42) form the round hole, insert cylindric lock (5) in this round hole.

3. The nickel-titanium alloy intravascular stent heat setting tool clamp according to any one of claims 1 or 2, which is characterized in that: the expanding shaft (3) is drilled with a blind hole (31), and the end part of the cylindrical pin (5) is inserted into the blind hole (31).

4. The nickel-titanium alloy intravascular stent tooling clamp for heat setting according to claim 1, characterized in that: left side end cover (4) front end is equipped with first U type groove (43), left side support (2) and left side end cover (4) are pressed from both sides tightly fixedly in first bolt (12) pass left side support (2) and first U type groove (43), install first opening packing ring (6) on first bolt (12), place in first U type groove (43) upper end first opening packing ring (6), first opening packing ring (6) external diameter is greater than first U type groove (43) inner width, the nut is installed to first bolt (12) upper end, and the external circle diameter of nut is less than first U type groove (43) inner width.

5. The nickel-titanium alloy intravascular stent tooling clamp for heat setting according to claim 1, characterized in that: right side support (11) upper end is equipped with semicircular groove (111), right side end cover (9) lower extreme is equipped with semicircular groove (91), semicircular groove (111) and semicircular groove (91) form the round hole, insert propulsion shaft (10) and rotate the connection in this round hole.

6. The nickel-titanium alloy intravascular stent tooling clamp for heat setting according to claim 1, characterized in that: right side end cover (9) front end is equipped with second U type groove (92), second bolt (121) pass right side support (11) and second U type groove (92) with right side support (11) and right side end cover (9) clamp fixed, install second opening packing ring (61) on second bolt (121), place in second U type groove (92) upper end second opening packing ring (61), second opening packing ring (61) external diameter is greater than second U type groove (92) inner width, the nut is installed to second bolt (121) upper end, and the external circle diameter of nut is less than second U type groove (92) inner width.

7. The nickel-titanium alloy intravascular stent tooling clamp for heat setting according to claim 1, characterized in that: the liner plate (8) is a hollow cylinder formed by three arc-shaped cylinders, the inner diameter of the hollow cylinder formed by the three arc-shaped cylinders is equal to that of the nickel-titanium alloy intravascular stent (7), and inner chamfers (81) are arranged at the front ends of the inner side walls at the two ends of the liner plate (8).