CN113441613A - Clamping tool for heat setting of vascular stent - Google Patents
Clamping tool for heat setting of vascular stent Download PDFInfo
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- CN113441613A CN113441613A CN202110782845.0A CN202110782845A CN113441613A CN 113441613 A CN113441613 A CN 113441613A CN 202110782845 A CN202110782845 A CN 202110782845A CN 113441613 A CN113441613 A CN 113441613A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
- B21D31/04—Expanding other than provided for in groups B21D1/00 - B21D28/00, e.g. for making expanded metal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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Abstract
The invention relates to a tool clamp for heat setting of a vascular stent, which comprises an expansion mechanism and a rack capable of bearing the expansion mechanism, wherein the expansion mechanism comprises a screw rod, nuts respectively arranged on the left side and the right side of the screw rod, and expansion units with symmetrical structures arranged between the nuts on the left side and the right side. The left nut, the right nut, the screw and the expansion units which are bilaterally symmetrical ensure the stress uniformity of the intravascular stent, reduce the stress concentration of the intravascular stent, improve the mechanical property of the intravascular stent and further prolong the service life of the intravascular stent; furthermore, the nuts on the two sides are pushed simultaneously, so that labor is saved; the length setting of third connecting rod is more favorable to the expansion of blood vessel support.
Description
Technical Field
The invention relates to the field of medical equipment, in particular to a tool clamp for heat setting of a vascular stent.
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.
Chinese patent CN112676472A discloses a frock clamp for adjustable intravascular stent heat setting, which moves along the axial direction through the main shaft, so that the connecting rod assembly rotates to drive the supporting plate to expand along the radial direction, thereby expanding the intravascular stent. Because one side of the supporting plate is abutted to the baffle, the supporting plate can be rubbed by the baffle when sliding and expanding on the baffle, so that the expansion is hard during actual expansion. In addition, because the support plate unilateral receives sliding friction, lead to the atress of support plate both sides different, easily make the uneven circumstances of atress of blood vessel support appearance.
Disclosure of Invention
The invention aims to solve the technical problem of providing a tool clamp for heat setting of a vascular stent, which is uniformly stressed and saves more labor.
In order to solve the technical problems, the invention adopts a technical scheme that:
the invention provides a frock clamp for heat setting of a vascular stent, which comprises an expansion mechanism and a frame capable of bearing the expansion mechanism, wherein the expansion mechanism comprises a screw rod, nuts respectively arranged at the left side and the right side of the screw rod, and expansion units arranged between the nuts at the left side and the right side;
the left side and the right side of the screw rod are both provided with threads, the rotating directions of the threads are opposite, and the nut is in threaded connection with the screw rod; the tool clamp for the heat setting of the vascular stent further comprises a connecting piece, wherein the connecting piece is connected with the nut and can limit the nut to only slide along the axial direction of the screw rod;
the expansion unit has a bilaterally symmetrical structure and is capable of expanding or contracting in a radial direction thereof;
if the screw rod is rotated around the first direction, the nuts on the left side and the right side move oppositely and drive the expansion unit to expand along the radial direction; if the screw rod is rotated around the second direction, the nuts on the left side and the right side move in the opposite direction and drive the expansion unit to contract along the radial direction; the first direction and the second direction are opposite.
According to the expansion device, the left nut and the right nut, the expansion units with the bilaterally symmetrical structures and the screw rod are arranged, so that the nuts on the left side and the right side can move oppositely when the screw rod is rotated, the expansion units are pushed to expand along the radial direction, and the intravascular stent is driven to expand along the radial direction; because the nuts on the left side and the right side are stressed in the same size, the forces on the left side and the right side of the expansion unit are the same, so that the expansion of the intravascular stent is more uniform, the stress concentration of the intravascular stent caused by uneven stress is reduced, the mechanical property of the intravascular stent is further improved, and the service life of the intravascular stent is prolonged; in addition, the nuts on two sides are pushed simultaneously, so that labor is saved.
Preferably, the expansion unit is in including the cover establish the sleeve of the intermediate position of screw rod and symmetry setting the pole subassembly of sleeve left and right sides, the sleeve with screw rod clearance fit, every side the both ends of pole subassembly respectively with correspond the side the nut and sleeve looks swivelling joint.
According to some preferred embodiments, the rod assembly comprises a plurality of linkage groups uniformly distributed along the circumferential direction of the screw rod, each linkage group comprises a first connecting rod, a second connecting rod and a third connecting rod, one end of the first connecting rod is rotatably connected with the nut, the other end of the first connecting rod is rotatably connected with the middle part of the second connecting rod, one end of the second connecting rod is rotatably connected with the sleeve, and the other end of the second connecting rod is rotatably connected with the middle part of the third connecting rod; when the blood vessel bracket is sleeved on the third connecting rod, the third connecting rod is parallel to the axial lead of the screw rod.
Preferably, the included angle a between the first connecting rod and the axial lead of the screw is 1-89 degrees, further 1-60 degrees, and further 10-45 degrees.
Preferably, the included angle r between the second connecting rod and the axial lead of the screw is 1-89 degrees, further 1-60 degrees, and further 20-45 degrees.
When the first connecting rod and the second connecting rod are parallel to the axis, the expansion unit cannot be expanded no matter how much force is used. Dead points of the connecting rod group are completely avoided through the arrangement of the included angle between the first connecting rod and the axis and the arrangement of the included angle between the second connecting rod and the axis, so that the expansion unit can be smoothly expanded.
Preferably, the third connecting rod is parallel to the axial lead of the screw rod, and the vascular stent can be sleeved on the third connecting rod.
Further preferably, the length of the third connecting rod is 40% -45% of the total length of the blood vessel support.
Preferably, the number of the link groups of each side of the rod assembly is 4-16.
Preferably, the connecting piece is a rigid piece with certain rigidity, each nut is provided with the rigid piece, one end of each rigid piece is fixedly connected with the corresponding nut, and the other end of each rigid piece is connected with the rack in a sliding mode. "certain rigidity" in the present application refers to the ability to not or not easily deform under the action of an external force.
Further preferably, the connecting member is made of a metal material or an alloy material. The metal includes, but is not limited to, iron, copper, silver, zinc, titanium, aluminum, the alloy includes, but is not limited to, steel, for example, the connector may be an alloy wire.
According to some preferred embodiments, the expansion unit comprises supporting units respectively located at the left side and the right side and used for supporting the vascular stent, each supporting unit comprises a plurality of third connecting rods uniformly distributed around the circumferential direction of the screw rod, and the length of each third connecting rod is 40% -45% of the total length of the vascular stent.
This application supports intravascular stent through a plurality of third connecting rods that adopt symmetric distribution and have certain length, when guaranteeing holding power and expansion effect, reduces the area of contact of third connecting rod and intravascular stent as far as possible to can reduce the area of friction of third connecting rod and intravascular stent as far as possible, reduce the frictional force on the intravascular stent as far as possible, reduce the risk of intravascular stent wearing and tearing as far as possible, be favorable to intravascular stent's expansion deformation more.
Preferably, a rotating arm is arranged at one end of the screw rod, the rotating arm comprises a connecting part and a rotating arm body, one end of the connecting part is fixedly connected with one end of the screw rod, the other end of the connecting part is fixedly connected with the rotating arm body, and the axis of the rotating arm body is parallel to the axis of the screw rod.
Preferably, the rack comprises a base and support plate components respectively arranged on the left side and the right side of the base; each support plate component comprises a support plate and an end cover, one end of each support plate is fixedly connected with the base, the other end of each support plate is provided with a first groove and is rotatably connected with the end cover, and the end cover is provided with a second groove matched with the first groove;
the screw rod can be arranged between the first groove and the second groove and can rotate around the axis line of the screw rod without moving left and right.
Further preferably, the first groove and the second groove are semicircular grooves, limiting grooves matched with the support plate assembly are respectively arranged on the left side and the right side of the screw rod, the limiting grooves can be arranged between the first groove and the second groove, and the diameter of the screw rod is larger than that of the first groove and larger than that of the limiting grooves.
Further preferably, the rack further comprises a locking mechanism comprising a first locking piece, a second locking piece, and a locking ring; the locking mechanism comprises an end cover, a first locking block, a second locking block, a locking ring and a locking mechanism, wherein the end cover is provided with a first groove, the first locking block is arranged on the end cover and fixedly connected with the end cover, the second locking block is arranged on the supporting plate and fixedly connected with the supporting plate, the locking ring is hinged with the first locking block and provided with a through groove matched with the second locking block, and when the end cover is arranged on the first groove, the locking ring can rotate around a hinged point to enable the second locking block to be clamped in the through groove, so that the locking mechanism is in a locking state.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the expansion unit, the left nut, the right nut, the screw and the expansion units which are bilaterally symmetrical are arranged, so that when the screw is rotated, the nuts on the left side and the right side can move oppositely, the expansion units are pushed from the left side and the right side respectively to enable the expansion units to drive the intravascular stent to expand along the radial direction, and because the propelling force of the left nut and the propelling force of the right nut are the same, the left stress and the right stress of the intravascular stent during expansion are the same, the intravascular stent can be uniformly expanded, the stress concentration caused by uneven stress of the intravascular stent is reduced, the mechanical property of the intravascular stent is improved, and the service life of the intravascular stent is further prolonged;
furthermore, the nuts on the two sides are pushed simultaneously, so that labor is saved;
further, through the setting of the length of third connecting rod, when guaranteeing stent dilation homogeneity, reduce the friction area between third connecting rod and the stent as far as possible to reduce the required power of expansion as far as possible, reduce the frictional force on the stent as far as possible, not only greatly reduced the wear rate of stent processing, still be favorable to stent's expansion more.
Drawings
FIG. 1 is a schematic structural view of a tooling fixture according to an embodiment of the present invention;
FIG. 2 is a schematic view of a tool holder (without a frame) in a condensed state according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a tool holder (without a frame) in an expanded state according to an embodiment of the present invention;
fig. 4 is an enlarged view of a portion a in fig. 3;
FIG. 5 is a schematic structural diagram of a rack in an embodiment of the present invention;
in the figure: 1. the blood vessel stent comprises a base, 2, a support plate, 3, an end cover, 4, a locking mechanism, 41, a first locking block, 42, a second locking block, 43, a locking ring, 5, a screw rod, 51, a connecting part, 52, a rotating arm body, 6, a nut, 71, a first connecting rod, 72, a second connecting rod, 73, a third connecting rod, 8, a sleeve, 9, a blood vessel stent, 10 and a connecting piece.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the embodiments of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive. In the description of the embodiments of the present invention, it should be understood that the terms "left", "right", etc. indicate orientations or positional relationships based on those shown in fig. 1 only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise. In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations. In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or the first and second features being in contact, not directly, but via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature. The following disclosure provides many different embodiments or examples for implementing different configurations of embodiments of the invention. To simplify the disclosure of embodiments of the invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit embodiments of the invention. Furthermore, embodiments of the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
As shown in fig. 1, a tooling clamp for heat setting of a vascular stent comprises an expansion mechanism which can be used for expanding the vascular stent 9 and a frame which can bear the expansion mechanism.
As shown in fig. 2, the expanding mechanism includes a screw 5, nuts 6 respectively provided on both left and right sides of the screw 5, and an expanding unit provided between the left and right nuts 6 and capable of expanding or contracting in the radial direction by the nuts 6 on both sides. The expansion unit has a bilateral symmetry structure, the intravascular stent 9 can be sleeved on the expansion unit, and the intravascular stent 9 can be expanded step by step through the expansion of the expansion unit.
The screw 5 has threads on both the left and right sides, and the threads on the left and right sides are opposite in direction. The nuts 6 are respectively arranged at the left and right sides of the screw 5 and are in threaded connection with the screw 5, so that when the reverse threads at the two sides are respectively matched with the nuts 6 at the two sides, the nuts 6 at the two sides can move oppositely or reversely by rotating the screw 5.
The frock clamp for the heat setting of the blood vessel support further comprises a connecting piece 10, wherein the connecting piece 10 is a rigid piece with certain rigidity, the rigid piece is made of a metal material or an alloy material, and the rigid piece is made of low-carbon steel. Preferably, the connecting member 10 in this embodiment is an alloy wire. One end of the connecting piece 10 is connected with the base 1 of the frame in a sliding way, and the other end of the connecting piece 10 is fixedly connected with the nut 6, so that the nut 6 is limited to move only along the axial direction of the screw 5. Preferably, the base 1 is provided with a slideway (not shown) which is matched with the connecting piece 10, and the extending direction of the slideway is parallel to the axial line of the screw rod 5, so that when the screw rod 5 is rotated, the connecting piece 10 can move in the slideway along the axial direction of the screw rod 5 under the driving of the nut 6.
When the screw rod 5 is forced to rotate around the axial lead of the screw rod, the nuts 6 can move along the axial lead direction of the screw rod 5, and the nuts 6 on the left side and the right side can move in opposite directions due to opposite thread turning directions on the left side and the right side, so that the expansion unit is pushed to realize radial expansion; when the screw 5 is rotated in the opposite direction, the nuts 6 on the left and right sides move in the opposite direction and drive the expansion unit to contract in the radial direction. Compared with the arrangement of a single-side propelling component, the screw rod 5, the nuts 6 on the left side and the right side and the expansion unit are arranged in a matched mode, so that the uniformity of expansion of the intravascular stent 9 can be guaranteed, and the nuts 6 on the left side and the right side can be simultaneously propelled more conveniently.
In order to rotate the screw rod 5 conveniently, a rotating arm is further arranged at the right end of the screw rod 5, the rotating arm comprises a connecting portion 51 and a rotating arm body 52, one end of the connecting portion 51 is fixedly connected with and perpendicular to one end of the screw rod 5, the other end of the connecting portion 51 is connected with and perpendicular to the rotating arm body 52, and the axis of the rotating arm body 52 is parallel to the axis of the screw rod 5. When the stent 9 needs to be expanded, the rotating arm body 52 can be rotated around the axis of the screw 5, and the rotation of the rotating arm body 52 drives the screw 5 to rotate.
The expanding mechanism further comprises a sleeve 8 sleeved in the middle of the screw rod 5 and rod assemblies symmetrically arranged on the left side and the right side of the sleeve 8. The sleeve 8 is in clearance fit with the screw 5, and when the screw 5 rotates around the axis of the screw, the sleeve 8 cannot rotate along with the rotation of the screw 5 because a clearance is reserved between the sleeve 8 and the screw 5; because the rod components on the left side and the right side of the sleeve 8 are symmetrically arranged and the stress on the left side and the right side is consistent when the rod components are expanded or contracted, the sleeve 8 can not move along with the rotation of the screw rod 5. The lever assemblies on the left and right sides of the sleeve 8 are symmetrically arranged, and only the lever assembly on the left side is taken as an example for explanation.
As shown in fig. 4, the rod assembly is composed of a plurality of links arranged along the circumferential direction of the screw 5, and the links are preferably arranged at equal intervals in order to make the force applied to the stent 9 more uniform. The connecting rod group can be provided with 4-16 groups, specifically several groups, and the diameter, the material and the like of the blood vessel stent 9 which is expanded according to actual needs can be selected.
Each connecting rod group comprises a first connecting rod 71, a second connecting rod 72 and a third connecting rod 73, one end of the first connecting rod 71 is hinged with the nut 6, the other end of the first connecting rod 71 is hinged with the middle part of the second connecting rod 72, and the included angle a between the first connecting rod 71 and the axial lead of the screw 5 is 1-89 degrees, for example, the included angle a can be 10 degrees, 20 degrees, 30 degrees, 40 degrees, 50 degrees, 60 degrees, 70 degrees, 80 degrees and the like; one end of the second connecting rod 72 is hinged with one end of the sleeve 8, the other end of the second connecting rod 72 is connected with the middle part of the third connecting rod 73, and the included angle r between the second connecting rod 72 and the axial lead of the screw 5 is 1-89 degrees, for example, the included angle r can be 10 degrees, 20 degrees, 30 degrees, 40 degrees, 50 degrees, 60 degrees, 70 degrees, 80 degrees, and the like; when the blood vessel stent 9 is sleeved on the third connecting rod 73, the third connecting rod 73 is parallel to the axial lead of the screw 5.
The length of the third connecting rod 73 is not easy to be too long, the longer the length of the third connecting rod 73 is, the larger the contact area between the third connecting rod 73 and the blood vessel stent 9 is, the larger the friction area between the third connecting rod 73 and the blood vessel stent 9 is, so that the larger the expansion force applied to the whole blood vessel stent when the expansion requirements under the same conditions are met is, and the larger the friction force is, so that the expansion of the blood vessel stent is not facilitated; meanwhile, the larger the friction force is, the higher the abrasion risk of the blood vessel support 9 is; the length of the third link 73 is not too short, and the shorter the third link 73 is, the smaller the contact area between the third link 73 and the blood vessel stent 9 is, the more uneven the whole stress of the blood vessel stent 9 is, the more uneven the expansion of the blood vessel stent 9 is, and the situation that the middle is narrow and the two ends are wide occurs. Preferably, when the axial shortening rate of the blood vessel support 9 is within 10%, the length of the third link 73 is preferably 40% to 45% of the total length of the blood vessel support 9 in order to reduce the friction between the blood vessel support 9 and the third link 73 as much as possible under the condition that the stress of the blood vessel support 9 is uniform.
As shown in fig. 5, the rack includes a base 1, and identical leg assemblies symmetrically disposed on the left and right sides of the base 1, respectively, and the leg assembly on the left side is explained below. The support plate component comprises a support plate 2 and an end cover 3, the lower end of the support plate 2 is fixedly connected with the base 1, and the upper end of the support plate 2 is hinged with the end cover 3. The upper end of the support plate 2 is provided with a first groove, and the first groove is preferably a semicircular groove; one end of the end cover 3, which is hinged with the support plate 2, is provided with a second groove matched with the first groove, and when the end cover 3 is covered on the support plate 2, the first groove and the second groove form a round hole. In order to enable the screw rod 5 to only rotate around the axis line of the screw rod and cannot move along the axis line direction, the left side and the right side of the screw rod 5 are respectively provided with a limiting groove 53 matched with the round holes, the limiting grooves 53 on the left side and the right side can be correspondingly arranged in the round holes on the support plate components on the corresponding sides and are in clearance fit with the corresponding round holes, the diameter of the screw rod 5 is larger than that of the round holes and is larger than that of the limiting groove 53, so that the limiting grooves 53 can be clamped in the corresponding round holes and cannot move left and right, and the screw rod 5 cannot move left and right under the rotating state. Of course, there are other ways to make the screw 5 only rotate around its axis and not move along the axis, for example: can respectively set up the stopper in the left and right sides of screw rod 5, when screw rod 5 set up in the round hole, the stopper of both sides is located the outside of the round hole of corresponding side respectively and is pressed close to with extension board 2 or end cover 3 mutually in order to play about spacing, and in this kind of mode, for making screw rod 5 can set up in the round hole and can rotate around its axial lead, the diameter of round hole is greater than the diameter of screw rod 5.
The frame further includes locking mechanisms 4 disposed on the two leg assemblies, respectively, each locking mechanism 4 including a first lock block 41, a second lock block 42, and a lock ring 43. The first locking piece 41 is arranged on the end cover 3 and fixedly connected with the end cover 3, the second locking piece 42 is arranged on the support plate 2 and fixedly connected with the support plate 2, the locking ring 43 is hinged with the first locking piece 41, and the locking ring 43 is provided with a through groove matched with the second locking piece 42. When the end cover 3 is covered on the support plate 2, the locking ring 43 can rotate around the hinge point to enable the second locking block 42 to be positioned in the through groove, so that the locking mechanism 4 is in a locking state, and the end cover 3 cannot rotate; when the locked state needs to be switched to the open state, the locking ring 43 is rotated around the hinge point to separate the through groove from the second locking piece 42.
The working principle is as follows:
(1) sleeving the vascular stent 9 on the expansion mechanism in the condensed state;
(2) opening a locking mechanism 4 and an end cover 3 of the frame, placing the expansion mechanism on the frame, and enabling limiting grooves 53 on two sides of the screw 5 to be respectively arranged in first grooves on corresponding support plates 2;
(3) the end covers 3 on the two sides are respectively covered on the corresponding support plates 2, and the locking mechanisms 4 on the two sides are controlled to be in a locking state;
(4) rotating the rotating arm to enable the screw rod 5 to rotate around the axis of the screw rod 5, so that the nuts 6 on the two sides move towards each other, and the expansion unit expands along the radial direction to expand the blood vessel stent 9;
(5) and stopping rotating the rotating arm until the intravascular stent 9 expands to the target diameter, thereby finishing the expansion.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.
Claims (11)
1. A frock clamp for the heat setting of a blood vessel stent is characterized by comprising an expansion mechanism and a frame capable of bearing the expansion mechanism,
the expansion mechanism comprises a screw rod (5), nuts (6) respectively arranged on the left side and the right side of the screw rod (5), and expansion units arranged between the nuts (6) on the left side and the right side;
threads are arranged on the left side and the right side of the screw rod (5), the rotating directions of the threads are opposite, and the nut (6) is in threaded connection with the screw rod (5);
the frock clamp for the heat setting of the vascular stent also comprises a connecting piece (10), wherein the connecting piece (10) is connected with the nut (6) and can limit the nut (6) to only slide along the axial direction of the screw rod (5);
the expansion unit has a bilaterally symmetrical structure and is capable of expanding or contracting in a radial direction thereof;
if the screw rod (5) is rotated around the first direction, the nuts (6) on the left side and the right side move oppositely and drive the expansion unit to expand along the radial direction; if the screw rod (5) is rotated around the second direction, the nuts (6) on the left side and the right side move in opposite directions and drive the expansion unit to contract along the radial direction; the first direction and the second direction are opposite.
2. The frock clamp for heat setting of the vascular stent according to claim 1, wherein the expansion unit comprises a sleeve (8) sleeved at the middle position of the screw rod (5) and rod assemblies symmetrically arranged at the left side and the right side of the sleeve (8), the sleeve (8) is in clearance fit with the screw rod (5), and two ends of the rod assembly at each side are respectively and rotationally connected with the nut (6) at the corresponding side and the sleeve (8).
3. The frock clamp for heat setting of the vascular stent according to claim 2, wherein the rod assembly comprises a plurality of linkage groups which are uniformly distributed along the circumferential direction of the screw (5), each linkage group comprises a first connecting rod (71), a second connecting rod (72) and a third connecting rod (73), one end of the first connecting rod (71) is rotatably connected with the nut (6), the other end of the first connecting rod (71) is rotatably connected with the middle part of the second connecting rod (72), one end of the second connecting rod (72) is rotatably connected with the sleeve (8), and the other end of the second connecting rod (72) is rotatably connected with the middle part of the third connecting rod (73); when the blood vessel support (9) is sleeved on the third connecting rod (73), the third connecting rod (73) is parallel to the axial lead of the screw rod (5).
4. The frock clamp for heat setting of the vascular stent according to claim 3, wherein the included angle (a) between the first connecting rod (71) and the axial line of the screw (5) is 1-89 degrees, and the included angle (r) between the second connecting rod (72) and the axial line of the screw (5) is 1-89 degrees; and/or the length of the third connecting rod (73) is 40% -45% of the total length of the blood vessel support (9).
5. The tooling clamp for heat setting of the vascular stent according to claim 3 or 4, wherein the number of the connecting rod groups of each rod assembly is 4-16.
6. The frock clamp for heat setting of the vascular stent according to claim 1, wherein the connecting piece (10) is a rigid piece with certain rigidity, each nut (6) is provided with the rigid piece, one end of the rigid piece is fixedly connected with the nut (6), and the other end of the rigid piece is connected with the frame in a sliding way; and/or the connecting piece (10) is made of a metal material or an alloy material.
7. The frock clamp for heat setting of the blood vessel support according to claim 1, wherein the expansion unit comprises support units which are respectively arranged at the left side and the right side and are used for supporting the blood vessel support (9), each support unit comprises a plurality of third connecting rods (73) which are uniformly distributed around the circumferential direction of the screw rod (5), and the length of each third connecting rod (73) is 40% -45% of the total length of the blood vessel support (9).
8. The frock clamp for heat setting of the vascular stent according to claim 1, wherein one end of the screw rod (5) is provided with a rotating arm, the rotating arm comprises a connecting part (51) and a rotating arm body (52), one end of the connecting part (51) is connected with one end of the screw rod (5), the other end of the connecting part (51) is connected with the rotating arm body (52), and the axial lead of the rotating arm body (52) is parallel to the axial lead of the screw rod (5).
9. The frock clamp for the heat setting of the vascular stent according to claim 1, wherein the frame comprises a base (1), and a support plate component respectively arranged at the left side and the right side of the base (1);
each support plate component comprises a support plate (2) and an end cover (3), one end of each support plate (2) is fixedly connected with the base (1), the other end of each support plate (2) is provided with a first groove and is rotatably connected with the end cover (3), and the end cover (3) is provided with a second groove matched with the first groove;
the screw (5) can be arranged between the first groove and the second groove and can rotate around the axis of the screw without moving left and right.
10. The frock clamp for heat setting of the vascular stent according to claim 9, wherein the first groove and the second groove are both semicircular grooves, the left side and the right side of the screw rod (5) are respectively provided with a limiting groove (53) matched with the stent component, the limiting groove (53) can be arranged between the first groove and the second groove, and the diameter of the screw rod (5) is larger than the diameter of the first groove and larger than the diameter of the limiting groove (53).
11. The frock clamp for heat setting of vascular stents according to claim 9, wherein the frame further comprises a locking mechanism (4), the locking mechanism (4) comprises a first locking block (41), a second locking block (42) and a locking ring (43); the first locking block (41) is arranged on the end cover (3) and fixedly connected with the end cover (3), the second locking block (42) is arranged on the support plate (2) and fixedly connected with the support plate (2), the locking ring (43) is hinged to the first locking block (41), the locking ring (43) is provided with a through groove matched with the second locking block (42), and when the end cover (3) is covered on the first groove, the locking ring (43) can rotate around a hinge point to enable the second locking block (42) to be clamped in the through groove, so that the locking mechanism (4) is in a locking state.
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| CN202110782845.0A CN113441613B (en) | 2021-07-12 | 2021-07-12 | Frock clamp for heat setting of vascular stent |
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| CN202110782845.0A CN113441613B (en) | 2021-07-12 | 2021-07-12 | Frock clamp for heat setting of vascular stent |
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| CN113441613B CN113441613B (en) | 2023-04-28 |
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| CN114101504A (en) * | 2021-10-15 | 2022-03-01 | 内蒙古工业大学 | Universal tool clamp for heat setting of metal vascular stent |
| CN116586526A (en) * | 2023-07-13 | 2023-08-15 | 上海威高医疗技术发展有限公司 | Tooling fixture for heat setting of alloy bracket and application method thereof |
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