CN112932740A - Crimping device for compression bracket - Google Patents

Abstract

Translated fromChinese

本发明提供一种用于压缩支架的压握装置，涉及医疗器械技术领域。所述压握装置包括：引导管；压握绳，所述压握绳的两端部贯穿所述引导管并且所述两端部之间的绳段在所述引导管的远端形成环状部，所述环状部适于套在待压缩的支架上；牵引机构，其设于所述引导管的近端并与所述压握绳的两端部连接，所述牵引机构设置成可操作地牵引所述压握绳以改变所述环状部的大小来压缩所述支架。本发明提供的压握装置结构简单，便于操作，便于使用较小的力来束缚并压缩长度较长、沿长度方向直径变化较大且硬度较高的支架。

The invention provides a crimping device for compressing a stent, which relates to the technical field of medical devices. The crimping device comprises: a guide tube; a crimping cord, two ends of the crimping cord pass through the guiding tube and the cord segment between the two ends forms a loop at the distal end of the guiding tube The annular part is suitable for being sleeved on the stent to be compressed; a traction mechanism is provided at the proximal end of the guide tube and connected with the two ends of the compression rope, and the traction mechanism is arranged to be able to The crimping cord is operatively pulled to change the size of the loop to compress the stent. The crimping device provided by the invention has a simple structure, is easy to operate, and is convenient to use a small force to restrain and compress a stent with a long length, a large diameter change along the length direction, and a high hardness.

Description

Crimping device for compression bracket

Technical Field

The invention relates to the technical field of medical instruments, in particular to a pressing and holding device for a compression bracket.

Background

The aortic dissection refers to the situation that high-speed and high-pressure blood flow in the aorta enters the junction of the intima-media outer layer or the media-media outer layer through the intimal laceration on the aortic wall, so that two true and false cavities of the aorta are formed and are expanded along the major axis direction of the aorta, which can cause rupture of the aorta or ischemia of branch arteries (myocardial infarction, cerebral infarction, viscera or lower limb ischemia), and the like, and the disease condition is serious, and is one of the most serious diseases affecting the aorta.

The classic aortic dissection Stanford was classified into A, B types, depending on where the proximal cleft of the aortic dissection was involved. Among them, the type B dissected lesions are confined to the abdominal aorta or the iliac arteries, the main treatment is the use of endoluminal graft for endoluminal isolation, with minimal invasion and good early clinical outcome. At present, minimally invasive endoluminal isolation has become the first choice for treatment of type B aortic dissection, significantly improving the advanced aortic reconstruction of type B dissection.

The interlayer lesion of the type A is positioned at the whole aorta part (type I) or the ascending aorta part (type II), the disease condition is fierce, the death rate in the acute stage is increased by 1% per hour, the existing treatment scheme for treating the type I mainly comprises emergency chest opening, deep hypothermia and extracorporeal circulation downward opening operation treatment, the ascending aorta interlayer resection and artificial blood vessel replacement are adopted in the operation process, and aortic valve replacement, coronary artery reconstruction, aortic arch replacement and the like are required to be performed at the same time. The operation has large trauma, the death rate is between 10 and 20 percent, the complication rate after the operation is more than 20 percent, and the problems of multi-organ function failure (kidney, brain, respiration, heart, digestive tract and the like), anastomotic hemorrhage, lung infection and the like can also occur after the operation to cause death. Therefore, for the elderly, patients with various complications and multiple organ dysfunction, and patients with organ hypoperfusion after the onset of the dissecting, conservative treatment is forced to be selected, but the conservative treatment has poor prognosis, the mortality rate is between 60 and 90 percent, and the clinical type with the worst prognosis is provided.

For the type a dissections, the related art proposes an ascending aortic valve stent graft for interventional minimally invasive surgical treatment (see the chinese patent application with application No. 202110254813.3, entitled "graft suitable for treating ascending aortic root disease", and chinese utility model patent application with application No. 202120497297.2, entitled "graft suitable for treating ascending aortic root disease") and a delivery system capable of delivering the ascending aortic valve stent graft (see the chinese patent application with application No. 202110254322.9, entitled "delivery system for delivering ascending aortic valve stent graft", and chinese utility model patent application with application No. 202120497299.1, entitled "delivery system for delivering ascending aortic valve stent graft"). When loading the ascending aortic valve stent-graft into the delivery system, it is necessary to compress the stent-graft to a smaller diameter using a stent crimping device and then load the compressed stent-graft into the delivery catheter of the delivery system.

Existing stent crimping devices, also known as crimpers, valve loading devices, or valve preparation devices, are an auxiliary device that squeezes a valve stent to a smaller diameter and into a delivery catheter. Fig. 1 is a schematic structural view of a conventional stent crimping device in the prior art. As shown in fig. 1, the conventional stent crimping device 1 is a handheld rotary extrusion type crimping device, and is formed by uniformly distributing and arranging rigid structures with a certain width along the circumferential direction, and each structure realizes centripetal and centrifugal motion through a sliding mechanism, so as to change the diameter of a central ring. The device has the advantages of being suitable for compressing peripheral stents and valve stents with shorter length and more uniform diameter, and being simple and quick to operate. The disadvantages are: due to the volume limitation of the structure, the change range of the maximum diameter and the minimum diameter of the central circle is limited, and the brackets with different diameters need to be pressed and held through multiple models; the structure is in rigid contact with the support, so that certain scratch risk is caused on the surface of the support; the central ring is a rigid structure with a certain width, and if a stent with a sudden change of the structure in the length direction is pressed, unpredictable deformation risks can be caused to the stent; the arc of the central circle is formed by fitting a rigid straight line, has certain discontinuity and contains steps, so that the bracket with the barb structure is not suitable for being held by pressure. The ascending aorta valve stent in the related art is characterized in that: the length is long, and the diameter change along the length direction is large; the hardness is high and the change rule along the axial direction is complex; the stent has a barb structure. It cannot be effectively crimped using the conventional stent crimping device.

Disclosure of Invention

In order to solve the technical problems, the embodiment of the invention provides a pressing and holding device for a compression bracket, which is suitable for a bracket with a barb structure, which has a long compression length, a large diameter change along the length direction, high hardness and a complex change rule along the axial direction.

In an embodiment of the present invention, the crimping device includes:

a guide tube;

a crimping rope, wherein two end parts of the crimping rope penetrate through the guide tube and a rope section between the two end parts forms a ring-shaped part at the far end of the guide tube, and the ring-shaped part is suitable for being sleeved on the bracket to be compressed;

a traction mechanism disposed at the proximal end of the guide tube and coupled to both ends of the crimping rope, the traction mechanism configured to operably draw the crimping rope to change the size of the loop to compress the stent.

In one embodiment of the present invention, the traction mechanism includes:

the rotating shaft is fixed at the proximal end of the guide tube;

the rotating disc is sleeved on the rotating shaft and connected with two end parts of the pressing and holding rope, and the rotating disc can rotate around the rotating shaft so that the pressing and holding rope is wound on the rotating disc;

a handle fixed to the turntable, the handle being operated to rotate the turntable to pull the squeeze cord.

In another embodiment of the present invention, the traction mechanism includes:

the far end of the threaded pipe is sleeved with the near end of the guide pipe, external threads are arranged on the periphery of the threaded pipe, and a slit is formed in the side wall of the threaded pipe;

the knob is rotatably sleeved on the outer periphery of the threaded pipe, and a part of the inner periphery of the knob is provided with an internal thread meshed with the external thread;

the lantern ring is sleeved on the periphery of the threaded pipe and is rotatably connected with one end of the knob, so that the knob can rotate relative to the lantern ring;

the sliding blocks are arranged in the cavities in the threaded pipes and connected with two end parts of the pressing and holding ropes, and the sliding blocks can slide along the axial direction of the threaded pipes;

and the connecting piece penetrates through the slit and is respectively connected with the sliding block and the lantern ring, so that the knob is rotated to move along the axial direction of the threaded pipe to drive the sliding block to pull the pressing and holding rope.

In yet another embodiment of the present invention, the traction mechanism includes:

the far end of the threaded pipe is sleeved with the near end of the guide pipe, external threads are arranged on the periphery of the threaded pipe, and a slit is formed in the side wall of the threaded pipe;

the knob is rotatably sleeved on the outer periphery of the threaded pipe, and a part of the inner periphery of the knob is provided with an internal thread meshed with the external thread;

the lantern ring is sleeved on the periphery of the threaded pipe and fixedly connected with one end of the knob, and an annular sliding rail is arranged on the inner periphery of the lantern ring;

the sliding blocks are arranged in the cavities in the threaded pipes and connected with two end parts of the pressing and holding ropes, and the sliding blocks can slide along the axial direction of the threaded pipes;

one end of the connecting piece is connected with the sliding block, the other end of the connecting piece penetrates through the slit and is connected with the lantern ring through the annular sliding rail, and the connecting piece can slide along the annular sliding rail so as to enable the knob to move along the axial direction of the threaded pipe through rotating the knob to drive the sliding block to pull the pressing and holding rope.

In one embodiment of the present invention, the number of the slits is plural, and the slits are arranged at equal intervals in the circumferential direction of the threaded pipe;

the number of the connecting pieces is the same as the number of the slits.

In one embodiment of the present invention, the number of the slits and the number of the connecting members are 2.

In one embodiment of the invention, the connecting element is integrally formed with the slider.

In still another embodiment of the present invention, the traction mechanism includes:

the far end of the threaded pipe is sleeved with the near end of the guide pipe, external threads are arranged on the periphery of the threaded pipe, and two slits are symmetrically arranged on the side wall of the threaded pipe along the circumferential direction of the threaded pipe;

the knob is rotatably sleeved on the outer periphery of the threaded pipe, and a part of the inner periphery of the knob is provided with an internal thread meshed with the external thread;

the lantern ring is sleeved on the periphery of the threaded pipe and is rotatably connected with one end of the knob, so that the knob can rotate relative to the lantern ring;

the pull rod is arranged in the cavity in the threaded pipe and connected with two end parts of the pressing and holding rope, and the two end parts of the pull rod respectively penetrate through the two slits of the threaded pipe and are connected with the lantern ring, so that the knob is rotated to move axially along the threaded pipe to drive the pull rod to pull the pressing and holding rope.

In one embodiment of the present invention, the pressure holding string is in the form of a wire or a band.

In one embodiment of the present invention, the material of the pressing rope is fabric or soft plastic.

Compared with the prior art, the crimping device for the compression bracket provided by the embodiment of the invention has the following beneficial technical effects:

the stent to be compressed is bound by a loop part formed by a pressure holding rope at the far end of the guide tube, and the traction device is arranged at the near end of the guide tube to pull the pressure holding rope, and the embodiment of the invention has the advantages that: the pressing and holding device has simple structure and convenient operation; the flexible pressing and holding rope can not cause damage to the surface of the bracket; the width of the pressing and holding rope is small, so that the part with barbs on the bracket is easily avoided to realize safe pressing and holding; the annular part can be adjusted to any diameter to bind and compress the bracket with a large or small diameter, and the application range is wide; the pressure holding rope is flexible and continuous, can be self-adapted to the sudden change part of the bracket structure, and avoids the deformation of the bracket; the bracket applicable to the embodiment of the invention has wide and various bracket ranges, and the crimping process is safe and effective.

Drawings

FIG. 1 is a schematic view of a conventional stent crimping device of the prior art;

FIG. 2 is a schematic structural view of a crimping device for compressing a stent according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of a crimping device for compressing a stent according to another embodiment of the present invention;

FIG. 4 is a cross-sectional view of the crimping device shown in FIG. 3, taken along the axial direction;

FIG. 5 is an enlarged partial view of the crimping device shown in FIG. 4;

fig. 6 is a schematic structural view of a crimping device for a compression stent according to still another embodiment of the present invention.

Fig. 7 is a schematic structural view of a crimping device for a compression stent according to still another embodiment of the present invention.

Detailed Description

To facilitate an understanding of the various aspects, features and advantages of the present inventive subject matter, reference is made to the following detailed description taken in conjunction with the accompanying drawings. It is to be understood that the following embodiments are illustrative only and not intended to limit the scope of the present invention, and that various combinations may be made without departing from the spirit of the invention.

Embodiments of the present invention provide a crimping device for compressing a stent that is adapted to compress the stent to a smaller diameter and then load the compressed stent into a delivery catheter. This pressure is held the device and is included: a guide tube; a crimping rope, wherein two end parts of the crimping rope penetrate through the guide tube and a rope section between the two end parts forms a ring-shaped part at the far end of the guide tube, and the ring-shaped part is suitable for being sleeved on the bracket to be compressed; a traction mechanism disposed at the proximal end of the guide tube and coupled to both ends of the crimping rope, the traction mechanism configured to operably draw the crimping rope to change the size of the loop to compress the stent. Herein, the distal end refers to the end farther from the operator when the operator operates the crimping device, and the proximal end refers to the end closer to the operator.

In this embodiment, after the stent to be compressed is placed into the loop formed by the crimping rope at the distal end of the guide tube, the pulling mechanism is operable to pull the crimping rope to change the size of the loop to compress the stent.

[ first embodiment ] to provide a liquid crystal display device

The following describes a squeezing device according to an embodiment of the present invention with reference to fig. 2.

Fig. 2 is a schematic view of a crimping device according to an embodiment of the present invention. As shown in fig. 2, in the present embodiment, the crimpingdevice 20 includes: aguide tube 21, acrimp cord 22 and atraction mechanism 23. Wherein, theguide tube 21 is in a shape of a slender rod, and a channel for the two ends of the pressing and holdingrope 22 to pass through is arranged in theguide tube 21; both ends of the crimpingrope 22 penetrate through the channel inside theguide tube 21 and the rope section between the two ends forms a loop at the distal end of theguide tube 21, the loop being adapted to fit over thestent 10 to be compressed; atraction mechanism 23 is disposed at the proximal end of theguide tube 21 and connected to both ends of the crimpingcord 22, and is operable to pull the crimpingcord 22 to change the size of the loop to compress thestent 10.

Wherein,traction mechanism 23 includes: ashaft 231, adial 232, and ahandle 233. Therotation shaft 231 is fixed to the proximal end of theguide tube 21, therotation plate 232 is sleeved on therotation shaft 231 and connected to both end portions of the pressing and graspingrope 22, therotation plate 232 can rotate around therotation shaft 231 so that the pressing and graspingrope 22 can be wound around the rotation plate, thehandle 233 is fixed to therotation plate 232, the pressing and graspingrope 22 is wound around the rotation plate by rotating therotation plate 232 by operating thehandle 233, and the pressing and graspingrope 22 is pulled to change the size of the annular portion.

In use, thestent 10 to be compressed can be placed in the ring portion, the ring portion is attached to the outer circumference of thestent 10, then therotating disc 232 is rotated by thehandle 233 to wind thepressing rope 22 around therotating disc 232, and therotating disc 232 can pull thepressing rope 22 by the two end portions of thepressing rope 22 while rotating, so as to reduce the ring portion, thereby compressing thestent 10. After compression, the pulling mechanism may be operated to continuously pull on the crimpingcords 22 to maintain thestent 10 in the compressed state, and then place thestent 10 in the compressed state into the delivery catheter of the delivery system.

In this embodiment, thestent 10 to be compressed may be an ascending aortic valve stent having a relatively long length, a relatively large diameter change along the length direction, a relatively high hardness, and a complex change rule along the axial direction in the related art, and including a barb structure, or may be another valve stent having a relatively long length. For the stent with longer length and larger diameter change along the length direction, the traction mechanism can be operated to adjust the size of the annular part, the stent is compressed in sections, and the compressed stent is placed into a conveying catheter of a conveying system in sections. For example, after a portion of the stent is compressed and placed in the delivery catheter of the delivery system, the loop may be sized to move to the next portion of the stent, compress the next portion of the stent, then place the compressed next portion of the stent in the delivery catheter of the delivery system, and so on until the entire stent is compressed and placed in the delivery catheter of the delivery system.

In this embodiment, the operation handle rotates the rotating disc to pull the pressing and holding rope, which is more labor-saving than the direct pulling of the pressing and holding rope, and the bracket with higher hardness can be compressed by only a small force. Of course, in addition to compressing a stiffer stent, the crimping device provided by this embodiment may also compress other less stiff stents, such as sinus polymer stents.

[ second embodiment ]

The following describes a squeezing device according to another embodiment of the present invention with reference to fig. 3, 4, and 5.

Fig. 3 is a schematic view of a crimping device according to another embodiment of the present invention, fig. 4 is a sectional view of the crimping device shown in fig. 3 in an axial direction, and fig. 5 is a partially enlarged view of the crimping device shown in fig. 4. As shown in fig. 3, 4, and 5, in the present embodiment, the crimpingdevice 30 includes: aguide tube 31, acrimp cord 32, and atraction mechanism 33. Wherein, the guidingtube 31 is in a shape of a slender rod, and a channel for the two ends 321 of the pressing holdingrope 32 to pass through is arranged in the guiding tube; both ends 321 of the crimpingcord 32 penetrate through the channel inside theguide tube 31 and the cord section between the two ends forms aloop 322 at the distal end of theguide tube 31, theloop 322 being adapted to fit over thestent 10 to be compressed; a pullingmechanism 33 is disposed at the proximal end of theguide tube 31 and connected to both ends 321 of the crimping cord, and is operable to pull the crimpingcord 32 to change the size of theloop 322 to compress thestent 10.

Wherein,traction mechanism 33 includes: threadedtube 331,knob 332,collar 333,slider 334, andconnector 335. The distal end of the threaded tube 331 is sleeved with the proximal end of the guide tube 31, a cavity in the threaded tube 331 and a channel in the guide tube 31 form a passage for the movement of the compression holding rope, the periphery of the threaded tube 331 is provided with external threads, and the side wall of the threaded tube 331 is provided with a slit; the knob 332 is rotatably sleeved on the outer periphery of the threaded pipe 331, and at least a part of the inner periphery of the knob 332 is provided with an internal thread for meshing with the external thread of the threaded pipe 331; the sleeve ring 333 is sleeved on the periphery of the threaded pipe 331 and is rotatably connected with one end of the knob 332, so that the knob 332 can rotate relative to the sleeve ring 333; the slider 334 is disposed in the cavity inside the threaded tube 331 and connected to both ends 321 of the crimping cord, and the slider 334 is capable of sliding in the axial direction of the threaded tube 331; the connecting member 335 passes through a slit of a side wall of the threaded tube 331 and is connected to a slider 334 disposed in an inner cavity of the threaded tube 331 and a collar 333 disposed at an outer periphery of the threaded tube 331, respectively, so that the slider 334 is moved to pull the gripping string 32 by rotating the knob 332 to move the knob 332 axially along the threaded tube 331.

When in use, thestent 10 to be compressed can be placed into theannular part 322, theannular part 322 is wrapped on the periphery of thestent 10, then theknob 332 is turned, theknob 332 and thecollar 333 connected with theknob 332 move towards the proximal end of the threadedtube 331 along the axial direction of the threadedtube 331, and thecollar 333 can move towards the proximal end of the threadedtube 331 while driving theslider 334 and the two ends 321 of the pressing and holding rope connected with theslider 334 to move towards the proximal end of the threaded tube along the axial direction of the threaded tube through the connecting piece 335 (as shown in the arrow direction in fig. 5), so that theannular part 322 is reduced to compress thestent 10. For a stent having a long length and a large diameter change along the length direction, thetraction mechanism 33 may be operated to adjust the size of thering portion 322, to compress the stent in stages, and to place the compressed stent in a delivery catheter of a delivery system in stages.

In the crimping device provided by the embodiment, the threaded pipe and the knob can be self-locked through the internal threads and the external threads, and after the support is compressed, even if an operator does not operate the knob, the traction mechanism still can enable the support to be kept in a compressed state through the self-locking of the threads, so that the operation is convenient. In addition, the pull force of the traction pressing and holding rope is converted into the rotating force of the rotating knob through the knob, compared with the method of directly pulling the pressing and holding rope, the pressing and holding device provided by the embodiment is more labor-saving, and the bracket with higher hardness can be compressed only by smaller force.

In this embodiment, theknob 332 is rotatably connected to thecollar 333, theslider 334 is fixedly connected to thecollar 333 via the connectingmember 335, or theslider 334 is integrally connected to the connectingrod 335 and then fixedly connected to thecollar 333. In other embodiments, theknob 332 may be fixedly connected or integrated with thecollar 333, for example, theknob 332 may be integrally formed with thecollar 333, and thecollar 333 may be rotatable with respect to the connectingmember 335, for example, a ring-shaped sliding track may be provided on the inner circumference of thecollar 333, and the connectingmember 335 may be slid along the ring-shaped sliding track, so that theslider 334 and thepressing rope 32 connected to theslider 334 may be pulled by rotating theknob 332 and thecollar 333.

In this embodiment, the connectingmember 335 is a rigid connecting member, the number of the slits and the connectingmember 335 is two, the two slits are symmetrically arranged along the circumferential direction of the threaded pipe, and the two connectingmembers 335 pass through the two slits, respectively. In other embodiments, if the connectingmember 335 is rigid enough to pull theslider 334 along the gripping cord, only one rigid connecting member and one slot may be provided, such that theslider 334 is connected to thecollar 333 through only one rigid connecting member. If the connectingmember 335 is not rigid enough to pull theslider 334 to pull the gripping string, a plurality of rigid connecting members and a plurality of slots for the plurality of rigid connecting members to pass through may be provided to pull theslider 334 with the plurality of rigid connecting members.

Alternatively, the connectingelement 335 may also be a flexible connecting element, such as a connecting rope, the number of the slits may be more than two, for example, 3 or 4, the number of the flexible connecting elements may be the same as the number of the slits, one flexible connecting element corresponds to one slit, and each flexible connecting element passes through each slit. The plurality of slits may be equally spaced in the circumferential direction of the threadedpipe 331, and the flexible coupling members corresponding to the slits may be equally spaced in the circumferential direction of the threadedpipe 331, thereby equalizing the tensile force of the flexible coupling members to theslider 334.

In this embodiment, theslider 334 is connected to thecollar 333 via the connectingmember 335, but in other embodiments, theslider 334 may be integrated with the connectingmember 335, for example, theslider 334 may be integrated with the connectingmember 335.

In the present embodiment, the pressingrope 32 is in a thin thread shape, and may be made of a soft material, such as fabric, soft plastic, etc., so as to avoid scratching the stent. By adopting the threadlike rope as a binding tool for compressing the stent, when the stent with longer length is compressed, the embodiment can compress the stent section by section, is convenient for compressing the stent with larger diameter change along the length direction and taking out the compressed stent from the annular part, has very narrow width, is soft and continuous, can easily avoid the part with the barb on the stent and can be self-adapted to the part with sudden change of the stent structure, thereby avoiding the deformation of the stent after compression.

[ third embodiment ]

Fig. 6 is a schematic structural view of a crimping device for a compression stent according to still another embodiment of the present invention. As shown in fig. 6, the crimpingdevice 40 provided in the present embodiment includes aguide tube 41, a crimpingcord 42, and a pullingmechanism 43. The structure of the crimpingdevice 40 according to the present embodiment is basically the same as that of the crimpingdevice 30 according to the second embodiment, but different from the second embodiment, the present embodiment uses a long narrow band as a binding tool for compressing the stent, the crimpingcord 42 has a narrow band shape, theguide tube 41 has a long and thin rod shape, the cross section of the guide tube is rectangular, and a passage through which the narrow band-shaped crimpingcord 42 passes is provided inside theguide tube 41. Similar to the use of a thin-line-shaped crimping rope as a constraining tool, the embodiment shown in fig. 7 uses a narrow-band-shaped crimping rope as a constraining tool, the narrow-band-shaped crimping rope has a narrow width, is flexible and continuous, and can also function to adapt to a sudden change position of the stent structure, so as to avoid a barbed position on the stent, avoid stent deformation, and facilitate compression of the stent with a large diameter change along the length direction.

[ fourth embodiment ]

Fig. 7 is a schematic structural view of a crimping device for a compression stent according to still another embodiment of the present invention. As shown in fig. 7, the crimpingdevice 50 according to the present embodiment has basically the same structure as the crimpingdevice 30 according to the second embodiment, and differs from the second embodiment in that the traction mechanism according to the present embodiment includes: threadedtube 531,knob 532,collar 533, and pullrod 534. The far end of the threaded pipe 531 is sleeved with the near end of the guide pipe 51, a cavity is arranged in the threaded pipe 531, external threads are arranged on the periphery of the threaded pipe 531, and two slits are symmetrically arranged on the side wall of the threaded pipe 531 along the circumferential direction of the threaded pipe; the knob 532 is rotatably sleeved on the outer periphery of the threaded pipe 531, and at least a part of the inner periphery of the knob 532 is provided with an internal thread for meshing with the external thread; the lantern ring 533 is sleeved on the periphery of the threaded pipe 531 and is rotatably connected with one end of the knob 532, so that the knob 532 can rotate relative to the lantern ring 533; the pull rod 534 is disposed in the hollow cavity of the threaded tube 531 and connected to the two ends 521 of the pressing and holding rope, and the two ends of the pull rod 534 respectively pass through the two slits of the threaded tube and are connected to the loop 533, so that the knob 532 is rotated to move along the axial direction of the threaded tube 531 to drive the pull rod 534 to pull the pressing and holding rope to change the size of the annular portion 522 to compress the stand 10.

In use, thestent 10 to be compressed can be placed into the ring-shapedportion 522, the ring-shapedportion 522 is wrapped around the outer circumference of thestent 10, then theknob 532 is turned to move theknob 532 and theloop 533 connected to theknob 532 towards the proximal end of the threadedtube 531 along the axial direction of the threadedtube 531, and theloop 533 can drive thepull rod 534 and the pressing and holding rope connected to thepull rod 534 to move towards the proximal end of the threadedtube 531 along the axial direction of the threaded tube while moving towards the proximal end of the threadedtube 531, so as to compress thestent 10 by reducing the ring-shapedportion 522. After the support is compressed, even if an operator does not operate the knob, the traction mechanism can still enable the support to be kept in a compressed state through thread self-locking, and the compressed support can be conveniently placed into a conveying conduit of a conveying system.

In this embodiment, theknob 532 is rotatably connected to thecollar 533, and thepull rod 534 is fixedly connected to thecollar 533 through a slit in the sidewall of the threadedtube 531. In other embodiments, theknob 532 may be fixedly connected to or integrated with theloop 533, for example, theknob 532 may be integrally formed with theloop 533, and thepull rod 534 may be rotatable with respect to theloop 533, for example, an annular slide rail may be provided on an inner circumference of theloop 533, and thepull rod 534 may be slidable along the annular slide rail, so that thepull rod 534 and the press-holding string connected to thepull rod 534 are pulled by rotating theknob 532 and theloop 533.

It should be understood by those skilled in the art that the foregoing is only illustrative of the present invention, and is not intended to limit the scope of the invention.

Claims (10)

1. A crimping device for compressing a stent, the crimping device comprising:

a guide tube;

a crimping rope, wherein two end parts of the crimping rope penetrate through the guide tube and a rope section between the two end parts forms a ring-shaped part at the far end of the guide tube, and the ring-shaped part is suitable for being sleeved on the bracket to be compressed;

a traction mechanism disposed at the proximal end of the guide tube and coupled to both ends of the crimping rope, the traction mechanism configured to operably draw the crimping rope to change the size of the loop to compress the stent.

2. The crimping device of claim 1, wherein the traction mechanism comprises:

the rotating shaft is fixed at the proximal end of the guide tube;

the rotating disc is sleeved on the rotating shaft and connected with two end parts of the pressing and holding rope, and the rotating disc can rotate around the rotating shaft so that the pressing and holding rope is wound on the rotating disc;

a handle fixed to the turntable, the handle being operated to rotate the turntable to pull the squeeze cord.

3. The crimping device of claim 1, wherein the traction mechanism comprises:

the far end of the threaded pipe is sleeved with the near end of the guide pipe, external threads are arranged on the periphery of the threaded pipe, and a slit is formed in the side wall of the threaded pipe;

the knob is rotatably sleeved on the outer periphery of the threaded pipe, and a part of the inner periphery of the knob is provided with an internal thread meshed with the external thread;

the lantern ring is sleeved on the periphery of the threaded pipe and is rotatably connected with one end of the knob, so that the knob can rotate relative to the lantern ring;

the sliding blocks are arranged in the cavities in the threaded pipes and connected with two end parts of the pressing and holding ropes, and the sliding blocks can slide along the axial direction of the threaded pipes;

and the connecting piece penetrates through the slit and is respectively connected with the sliding block and the lantern ring, so that the knob is rotated to move along the axial direction of the threaded pipe to drive the sliding block to pull the pressing and holding rope.

4. The crimping device of claim 1, wherein the traction mechanism comprises:

the far end of the threaded pipe is sleeved with the near end of the guide pipe, external threads are arranged on the periphery of the threaded pipe, and a slit is formed in the side wall of the threaded pipe;

the knob is rotatably sleeved on the outer periphery of the threaded pipe, and a part of the inner periphery of the knob is provided with an internal thread meshed with the external thread;

the lantern ring is sleeved on the periphery of the threaded pipe and fixedly connected with one end of the knob, and an annular sliding rail is arranged on the inner periphery of the lantern ring;

the sliding blocks are arranged in the cavities in the threaded pipes and connected with two end parts of the pressing and holding ropes, and the sliding blocks can slide along the axial direction of the threaded pipes;

one end of the connecting piece is connected with the sliding block, the other end of the connecting piece penetrates through the slit and is connected with the lantern ring through the annular sliding rail, and the connecting piece can slide along the annular sliding rail so as to enable the knob to move along the axial direction of the threaded pipe through rotating the knob to drive the sliding block to pull the pressing and holding rope.

5. The crimping device according to claim 3 or 4,

the number of the slits is multiple, and the slits are arranged at equal intervals along the circumferential direction of the threaded pipe;

the number of the connecting pieces is the same as the number of the slits.

6. The crimping device according to claim 5, wherein the number of the slits and the connecting pieces is 2.

7. The crimping device according to claim 3 or 4, wherein the connecting piece is integrally formed with the slider.

8. The crimping device of claim 1, wherein the traction mechanism comprises:

the far end of the threaded pipe is sleeved with the near end of the guide pipe, external threads are arranged on the periphery of the threaded pipe, and two slits are symmetrically arranged on the side wall of the threaded pipe along the circumferential direction of the threaded pipe;

the knob is rotatably sleeved on the outer periphery of the threaded pipe, and a part of the inner periphery of the knob is provided with an internal thread meshed with the external thread;

the lantern ring is sleeved on the periphery of the threaded pipe and is rotatably connected with one end of the knob, so that the knob can rotate relative to the lantern ring;

the pull rod is arranged in the cavity in the threaded pipe and connected with two end parts of the pressing and holding rope, and the two end parts of the pull rod respectively penetrate through the two slits of the threaded pipe and are connected with the lantern ring, so that the knob is rotated to move axially along the threaded pipe to drive the pull rod to pull the pressing and holding rope.

9. The crimping device of claim 1, wherein the crimping cord is in the form of a wire or a ribbon.

10. The crimping device of claim 1, wherein the material of the crimping cord is a fabric or a soft plastic.

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