CN109567981B - Support system, conveying device thereof, rear release structure and support - Google Patents
Support system, conveying device thereof, rear release structure and support Download PDFInfo
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- CN109567981B CN109567981B CN201710912006.XA CN201710912006A CN109567981B CN 109567981 B CN109567981 B CN 109567981B CN 201710912006 A CN201710912006 A CN 201710912006A CN 109567981 B CN109567981 B CN 109567981B
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- 230000007704 transition Effects 0.000 claims description 21
- 230000007246 mechanism Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 230000017531 blood circulation Effects 0.000 abstract description 9
- 230000003902 lesion Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 206010028980 Neoplasm Diseases 0.000 description 2
- 210000004204 blood vessel Anatomy 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 206010002329 Aneurysm Diseases 0.000 description 1
- 208000025494 Aortic disease Diseases 0.000 description 1
- 208000002251 Dissecting Aneurysm Diseases 0.000 description 1
- 208000032843 Hemorrhage Diseases 0.000 description 1
- 208000035965 Postoperative Complications Diseases 0.000 description 1
- 208000025865 Ulcer Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 210000000709 aorta Anatomy 0.000 description 1
- 208000007474 aortic aneurysm Diseases 0.000 description 1
- 206010002895 aortic dissection Diseases 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 230000008733 trauma Effects 0.000 description 1
- 231100000397 ulcer Toxicity 0.000 description 1
- 230000002792 vascular Effects 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
- A61F2/06—Blood vessels
- A61F2/07—Stent-grafts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
- A61F2/962—Instruments specially adapted for placement or removal of stents or stent-grafts having an outer sleeve
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Transplantation (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Cardiology (AREA)
- Animal Behavior & Ethology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Gastroenterology & Hepatology (AREA)
- Pulmonology (AREA)
- Prostheses (AREA)
- Media Introduction/Drainage Providing Device (AREA)
- Surgical Instruments (AREA)
Abstract
The invention provides a bracket system, a conveying device thereof, a rear release structure and a bracket. The proximal end of the support is provided with at least one proximal end connecting part, each proximal end connecting part is provided with a through hole, the rear release structure comprises a rear release control member, at least one distal end connecting part and at least one rear release constraint member, each distal end connecting part is provided with another through hole and is arranged at one end of the rear release constraint member, when the other end of the rear release constraint member is connected with the conveyor, and one end of the rear release control member passes through the through hole of the distal end connecting part to be connected with the conveyor when the through hole of the proximal end connecting part passes, and then one end of the rear release control member is pulled out of the conveyor and the distal end connecting part when the other end of the rear release control member is pulled, the constraint of the rear release constraint member can be released, so that the separable connection between the proximal end of the support and the conveyor is realized, and even if high-speed blood flow impacts the proximal end of the support is released, the proximal end of the support can not be folded.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to a bracket system, a conveying device thereof, a rear release structure and a bracket.
Background
The use of stent grafts for aortic disease treatment is a major advance in aortic surgery, with indications including aortic dissection, aortic aneurysm prosthesis, aortic penetrating ulcers, etc. The technique greatly reduces the operation mortality and postoperative complications, reduces the operation trauma and ensures that the patient recovers faster. The mechanism of the treatment is that the covered stent is sent into the lesion part through a special conveyer and then is opened, so that the tumor body is isolated from blood, and the death risk caused by rupture and massive hemorrhage of the aneurysm or the compression of the tumor body to surrounding tissues and organs is eliminated.
Among them, the precise positioning and release of the stent graft is critical for the intervention in the aortic lumen, which challenge is the high speed and high pressure of the aortic blood flow. At the instant of stent graft release, the stent may collapse proximally (proximal) under the impact of the blood flow. The folding of the proximal end of the stent can easily cause poor adherence of the proximal end of the stent and poor lesion isolation effect, and the stimulation of the stent peak to the vessel wall is increased to cause serious clinical consequences.
Thus, how to avoid stent proximal turnover is a focus of research on aortic stent delivery.
Disclosure of Invention
The invention aims to provide a stent system, a conveying device thereof, a rear release structure and a stent, which can prevent the stent from being folded under the impact of blood flow when the stent is released.
To achieve the above object, the present invention discloses a stent, the proximal end of which is provided with at least one proximal connection portion, each of which has a through hole for cooperation with a rear release structure to achieve detachable connection of the proximal end of the stent with a conveyor.
Further, the present invention also provides a rear release structure for the stent, the rear release structure comprising a rear release control member, at least one distal connection portion, and at least one rear release constraint, each distal connection portion having another through hole and being disposed at one end of the rear release constraint;
When the other end of the rear release restraint is connected with the conveyor and one end of the rear release restraint passes through the one through hole of the proximal end connecting part, one end of the rear release control piece passes through the other through hole of the distal end connecting part and then is connected with the conveyor;
When the other end of the rear release control member is pulled, one end of the rear release control member is withdrawn from the other through-hole of the conveyor and the distal connecting portion to unbind the rear release restraint.
Optionally, the rear release structure further includes a radial limiting portion disposed on the conveyor, one end of the rear release control member is further combined with the radial limiting portion before and/or after passing through the distal end connecting portion, and the radial limiting portion is configured to limit displacement of the distal end connecting portion in a radial direction of the stent.
Optionally, the radial stop comprises at least two through holes, one end of the rear release control passing through one through hole before passing through the distal connection and through the other through hole after passing through the distal connection, the one through hole being closer to the distal end of the conveyor than the other through hole.
Optionally, the conveyor is provided with at least one fixing hole of the rear release constraint member, and the other end of the rear release constraint member is fixed with the fixing hole of the rear release constraint member.
Optionally, a blind hole is formed in the conveyor, and one end of the rear release control member is fixed to the blind hole.
Still further, the present invention provides a conveying apparatus, including a conveyor and the rear release structure.
Optionally, the conveyer includes transition pipe and conical head, the conical head is located the proximal end of transition pipe, be provided with radial spacing portion and back release restraint fixed orifices on the transition pipe, be provided with the blind hole on the conical head.
Optionally, the conveyor further comprises a main control member, wherein a plurality of binding coils are arranged on the support, one end of the main control member sequentially passes through the plurality of binding coils from the distal end to the proximal end of the support, and the main control member passes through the radial limiting part and then is inserted into the blind hole to be fixed.
Still further, the present invention also provides a stent system comprising the delivery device and the stent.
In summary, in the stent and the rear release structure provided by the invention, at least one proximal end connecting part with a through hole is arranged at the proximal end of the stent, and a distal end connecting part with another through hole is arranged at one end of the rear release restraint, in practical use, the other end of the rear release restraint is connected with the conveyor, meanwhile, one end of the rear release restraint passes through the one through hole of the proximal end connecting part, then the rear release control piece passes through the other through holes of the stent and the distal end connecting part, and one end of the rear release control piece is connected with the conveyor, so that the separable connection between the proximal end of the stent and the conveyor is realized, and therefore, the proximal end of the stent can be released from the constraint of the conveyor only after the rear release control piece is pulled out, and when the stent is released, even if a high-speed blood flow impacts the proximal end of the stent, the proximal end of the stent can not be folded, and when a part of the stent is attached to the vessel wall, the rear release control piece can be pulled out, the proximal end of the stent can not be folded, and the proximal end of the stent can not be folded, because the proximal end of the stent can be completely attached to the vessel wall.
The core of the rear release structure is that the near end of the bracket is bound on the conveyor through a through hole matched with the near end of the bracket by a wire, the structure is simpler, and the rear release structure can be suitable for the bracket without a bare section structure. The rear release structure of the invention has no great change to the original structure of the covered stent, and the rear release structure is connected to the conveyor, so that the covered stent can be withdrawn from the body after the operation is finished.
Drawings
Fig. 1 is a schematic structural view of a conveying device according to a first embodiment of the present invention;
FIG. 2 is a schematic view of a structure of a stent according to a first embodiment of the present invention when the stent is connected to a delivery device;
FIG. 3 is a schematic view of a stent system according to a first embodiment of the present invention implanted in an aorta;
fig. 4 is a schematic view of the structure of the rear release restraint and rear release control as connected to the bracket and conveyor in accordance with one embodiment of the present invention.
The reference numerals are explained as follows:
1-conical head, 101-blind hole, 2-transition pipe, 201-third through hole, 203-second through hole, 202-first through hole, 3-back release restraint, 301-distal connection, 4-inner tube, 5-back release control, 6-main control, 7-bracket, 701-proximal connection, 702-restraint coil.
Detailed Description
To make the objects, advantages and features of the present invention more apparent, the stent system and its delivery device, post-release structure and stent of the present invention will be described in further detail with reference to fig. 1-4. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
First, the present embodiment provides a stent system comprising a delivery device and a stent 7, said stent 7 preferably being a stent graft. The delivery device includes a conveyor and a rear release structure.
As shown in fig. 1 to 4, the stent 7 includes a proximal connection portion 701, and the proximal connection portion 701 is located at a proximal end of the stent 7. Herein, the proximal end of the stent 7 is the end far from the operator, for example, when used for aortic treatment, the proximal end of the stent 7 is the end near the heart, i.e., the proximal end (best shown in fig. 3). The proximal connection 701 has a through hole for cooperating with a rear release structure described below to enable the proximal end of the stent 7 to be detachably connected to a conveyor.
The rear release structure includes a distal connection 301, a rear release restraint 3 and a rear release control 5. The distal connecting portion 301 has another through hole, and one end of the rear release constraint 3 is configured to have the distal connecting portion 301.
In specific use, the other end of the rear release restraint 3 is connected to the conveyor, while one end of the rear release restraint 3 passes through the one through hole of the proximal end connection part 701, then, one end of the rear release control 5 sequentially passes through the other through hole of the bracket 7 and the distal end connection part 301 from the distal end to the proximal end of the bracket 7, and one end of the rear release control 5 passes out of the other through hole and then is connected to the conveyor, thereby realizing the relative fixation of the proximal end of the bracket and the conveyor. Thus, when the stent 7 is released, the connection between the proximal end of the stent and the conveyor can be realized by means of the rear release structure, and at this time, even if the high-speed blood flow impinges on the proximal end of the stent, the proximal end of the stent can not be folded, and further, once the stent 7 is well attached to the vessel wall, the rear release control member 5 can be pulled away, so that the connection between the proximal end of the stent and the conveyor is released, and the proximal end of the stent is completely attached to the vessel wall.
Specifically, upon withdrawal of the rear release control member 5, the other end of the rear release control member 5 (which is located outside the body and preferably fixed to an external mechanism) may be pulled to withdraw one end of the rear release control member 5 from the other through-hole of the conveyor and the distal connecting portion 301, thereby releasing the restriction of the rear release restriction 3 and allowing the proximal end of the stent 7 to resume the expanded state.
In this embodiment, the stent 7 has an expanded state and a compressed state. When the bracket 7 is installed, the outer diameter of the bracket 7 is restrained by a plurality of restraint coils 702 on the bracket 7 (see fig. 3 in particular) so that the bracket 7 is folded into a compressed state; when the stent 7 is released, the other end of the main control member 6 is pulled to release the constraint of the outer diameter of the stent, so that the stent 7 is sprung open to an expanded state.
The proximal connection 701 may be one or more, and the number of the rear release constraints 3 corresponds to the proximal connection 701. Preferably, the number of proximal connectors 701 is plural, and thus the rear release constraints 3 are plural, each rear release constraint 3 carries one distal connector 301, and one proximal connector 701 allows one rear release constraint 3 to pass through. In an alternative, the proximal connection 701 is provided in two, and then the rear release restraint 3 is provided in two accordingly.
For convenience of description, the stent system, the delivery device, the stent and the rear release structure of the present embodiment are further described below by using two proximal connectors 701 as illustrations, but not limited thereto.
Alternatively, the proximal connection 701 may be a closed loop, and the distal connection 301 may be a closed loop. Of course, the present invention includes, but is not limited to, obtaining either of the proximal connection 701 and the distal connection 301 in a coil-closed manner, and obtaining these connections in an open-cell manner. For example, two closed loops are tied to the proximal end of the stent to form two proximal connections 701, or two through holes are cut into the proximal end of the stent to obtain two proximal connections 701. For example, one end of the rear release restraint 3 is wound to form a distal end connecting portion 301, or one end of the rear release restraint 3 is provided with a through hole to obtain a distal end connecting portion 301.
Wherein the length of the rear release constraint 3 is determined experimentally in order to obtain a better rear release effect. If the rear release restraint 3 is too long, the rear release effect is poor, namely the proximal end of the bracket has enough displacement space to turn over; if the rear release restraint 3 is too short, the proximal end of the stent tends to be lifted, and the stent cannot be attached to the vessel wall.
Further, to ensure the restraining effect of the rear release restraint 3, the rear release structure further includes a radial limit portion provided on the conveyor. The rear release control member 5 has one end, which may be combined with the radial limiting portion before passing through the distal connecting portion 301, after passing through the distal connecting portion 301, or before and after passing through the distal connecting portion 301, where the radial limiting portion is used to limit the distal connecting portion 301 to displace in the radial direction of the stent, so that the distal connecting portion 301 is prevented from moving in the radial direction of the stent, and the proximal end of the stent is more effectively prevented from being folded.
Further, the radial limiting portion includes at least two through holes, specifically, two through holes, for example, a first through hole 202 and a second through hole 203, respectively. As shown in fig. 4, one end of the rear release control member 5 passes through one second through hole 203 before passing through two distal end connecting portions 301 and passes through one first through hole 202 after passing through the distal end connecting portions 301, and it is apparent that the second through hole 203 is closer to the distal end of the conveyor than the first through hole 202. Herein, proximal refers to the end that is closer to the heart of the patient, i.e., the end that is farther from the operator, and distal refers to the end that is farther from the heart of the patient, while also being closer to the operator.
In order to apply force in the axial direction of the bracket 7, the line connecting the first through hole 202 and the second through hole 203 coincides with or is parallel to the axis of the conveyor, and the axis of the conveyor is on the same straight line with the axis of the bracket 7.
Still further, two third through holes 201 are further provided on the conveyor, and each third through hole 201 is fixed to the other end of one rear release restraint 3, so that the third through holes 201 are also called rear release restraint fixing holes, and may be knotted. Preferably, a blind hole 101 is further formed in the conveyor, and one end of the rear release control member 5 is fixed to the blind hole 101.
Next, the rear release structure of the present embodiment will be further described in connection with a specific conveyor.
As shown in fig. 1 to 4, a conveyor comprises a cone head 1 and a transition tube 2, the cone head 1 being located at the proximal end of the transition tube 2, the other end of the rear release restriction 3 being in particular connected to the transition tube 2, and one end of the rear release control 5 being connected to the cone head 1. In aortic lesion treatment, the conical head 1 is intended to be placed close to the heart, which is pre-implanted in the body for guiding purposes. The conical head 1 can be connected with the transition pipe 2 in a threaded or snap-on mode.
Optionally, the conical head 1 is provided with a blind hole 101, the diameter of which blind hole 101 is just capable of accommodating the rear release control member 5 and the main control member 6. Preferably, the depth of the blind hole 101 is 5-20mm. The end parts of the rear release control piece 5 and the main control piece 6 are inserted into the blind holes 101, so that the control piece can be prevented from being exposed outside the conical head to damage vascular tissues.
Further, the transition pipe 2 has a second through hole 203, a first through hole 202, and two third through holes 201 in this order from the distal end to the proximal end thereof. The transition pipe 2 and the conical head 1 are not limited to being formed separately, but may be formed integrally.
Two of the third through holes 201 are selectively provided on wings protruding from both sides of the transition pipe 2. The two third through holes 201 are preferably symmetrically arranged. The first through-hole 202 is optionally provided on another wing protruding from one side of the transition duct 2. The second through hole 203 is optionally an opening of the hollow inner cavity of the transition tube 2 disposed to the outside of the distal end thereof.
Further, the conveyor further comprises an inner tube 4, said inner tube 4 being located at the distal end of the transition tube 2, and a portion of said inner tube 4 being inserted into the transition tube 2 and connected to the transition tube 2 and the cone head 1. The inner tube 4 is used to allow the main body control member 6 and the rear release control member 5, etc. to pass through.
In order to realize the release of the bracket, the conveyor further comprises a main control member 6 for controlling the release of the bracket 7, wherein the bracket 7 is locked by the main control member 6 after being bound by a plurality of binding coils 702 on the bracket 7, and the release of the bracket can be realized after the locking of the main control member 6 is released.
With continued reference to fig. 4, the routing path of the main control member 6 is: first, one end of the main control member 6 passes through the plurality of binding coils 702 outside the stent from the distal end to the proximal end of the stent to bind the outer diameter of the stent 7, then passes through the first through hole 202, and finally is inserted into the conical head 1 through the blind hole 101, thereby allowing the stent 7 to be folded in a compressed state. The other end of the main control member 6 is preferably fixed with an external mechanism, and after the fixation with the external mechanism is released, the release of the bracket can be realized by pulling the other end of the main control member 6.
Next, the routing path of the rear release control 5 will be further described with reference to fig. 4.
Firstly, the rear release control member 5 passes through the inner cavity of the bracket 7 from the distal end to the proximal end of the bracket 7, then passes through the second through hole 203 of the transition tube 2, passes through the two distal end connecting parts 301 and one first through hole 202 in sequence after passing out of the second through hole 203, and finally is inserted into the conical head 1 through the blind hole 101. Therefore, the two distal end connecting portions 301 are confined between the second through hole 203 and the first through hole 202. In the practical use process, when the proximal end of the stent is subjected to the impact force of blood flow, the proximal end connecting portion 701 moves towards the distal end of the stent, and because the distal end connecting portion 301 is penetrating the proximal end connecting portion 701, the distal end connecting portion 301 will move towards the distal end of the stent 7 under the acting force of the proximal end connecting portion 701 until the proximal end connecting portion 701 cannot move towards the distal end due to the restriction of the length of the rear release restricting member 3 or the second through hole 203, so that the proximal end connecting portion 701 cannot move towards the distal end, and the proximal end of the stent cannot move towards the distal end, thereby finally achieving the purpose of preventing the proximal end of the stent from folding.
In this embodiment, the bracket 7 includes a plurality of axially connected wave bands, each of which is formed by connecting a plurality of wave rods. The shape, size, density of each wave band, and the width, size and connection mode of the wave rod are not limited by the present invention. Preferably, when releasing the stent, i.e. before releasing the control member 5 after withdrawal, three or more sections of the stent 7 are preferably adapted to engage the vessel wall, each section being defined by two adjacent bands.
The specific working process of the bracket system comprises the following steps:
First, the stent 7 is introduced into a conveyor, and the stent 7 is placed in a compressed state; simultaneously, the main control piece 6 passes through all the restraint coils 702 on the bracket 7, and one end of the main control piece 6 passes through the first through hole 202 of the transition pipe 2 and is inserted into the blind hole 101 of the conical head 1 to be fixed; simultaneously, the rear release control piece 5 sequentially passes through the inner cavity of the bracket, the second through hole 203, the two far-end connecting parts 301 and the first through hole 202, and finally is inserted into the blind hole 101 to be fixed;
Secondly, when the bracket 7 is positioned at a proper position in the body, the main control piece 6 is pulled first until three or more structures at the proximal end of the bracket spring open and are attached to the wall of the blood vessel; at this time, although the proximal end of the stent is subjected to the impact force of blood flow, the proximal end of the stent is still constrained by the rear release constraint piece 3 and cannot move to the distal end, so that the stent cannot be folded;
Then, the rear release control member 5 is pulled until the rear release control member 5 is released from the distal end connecting portion 301, at which time the proximal end of the stent is no longer constrained by the rear release constraining member 3;
Then, the main control piece 6 and the rear release control piece 5 are continuously and rapidly pulled, so that all the sections of the bracket are completely sprung and are attached to the wall of the blood vessel; finally, the conveyor is retracted, so that the rear release restraint 3 is withdrawn from the body together with the conveyor.
It should be noted that, the rear release restraint 3 includes, but is not limited to, a flexible body such as a wire, a rope, a belt, etc., and the rear release control member 5 and the main control member 6 are preferably medical guide wires, so that local materials are conveniently obtained, and the use cost is reduced. The rear release control 5 and the body control 6 may be arranged in parallel in the inner tube 4. The third through hole 201 is not limited to a through type, and may be a blind hole as long as the rear release restraint 3 and the transition pipe 2 can be fixed. The third through hole 201 is not limited to being provided between the first through hole 202 and the second through hole 203, and the position of the fixing point is specifically set according to the length of the rear release restraint 3.
Finally, the above embodiments describe how the conveyor is connected and the release structure is described in detail, however, the present invention includes, but is not limited to, the connection modes listed in the above embodiments, and any contents that are transformed based on the constraint modes provided in the above embodiments fall within the scope of the present invention. One skilled in the art can recognize that the above embodiments are illustrative.
In summary, in the stent and the rear release structure provided by the invention, at least one proximal end connecting part with a through hole is arranged at the proximal end of the stent, and a distal end connecting part with another through hole is arranged at one end of the rear release restraint, in practical use, the other end of the rear release restraint is connected with the conveyor, meanwhile, one end of the rear release restraint passes through the one through hole of the proximal end connecting part, then the rear release control piece passes through the other through holes of the stent and the distal end connecting part, and one end of the rear release control piece is connected with the conveyor, so that the separable connection between the proximal end of the stent and the conveyor is realized, and therefore, the proximal end of the stent can be released from the constraint of the conveyor only after the rear release control piece is pulled out, and when the stent is released, even if a high-speed blood flow impacts the proximal end of the stent, the proximal end of the stent can not be folded, and when a part of the stent is attached to the vessel wall, the rear release control piece can be pulled out, the proximal end of the stent can not be folded, and the proximal end of the stent can not be folded, because the proximal end of the stent can be completely attached to the vessel wall.
The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.
Claims (9)
1. A rear release structure for a stent, the proximal end of the stent being provided with at least one proximal connection portion, each proximal connection portion having a through hole for cooperation with the rear release structure to effect detachable connection of the proximal end of the stent to a conveyor, characterized by comprising a rear release control member, at least one distal connection portion, and at least one rear release constraint, each distal connection portion having another through hole and being provided at one end of the rear release constraint;
When the other end of the rear release restraint is connected with the conveyor and one end of the rear release restraint passes through the one through hole of the proximal connecting part, one end of the rear release control piece passes through the other through hole of the distal connecting part and then is connected with the conical head of the conveyor; the other end of the rear release control piece is fixed with an external mechanism;
When the other end of the rear release control member is pulled, one end of the rear release control member is withdrawn from the other through-hole of the conveyor and the distal connecting portion to unbind the rear release restraint.
2. The rear release structure of claim 1, further comprising a radial stop disposed on the conveyor, one end of the rear release control member further being coupled to the radial stop before and/or after passing through the distal connection, the radial stop for limiting displacement of the distal connection in a radial direction of the stent.
3. The post-release structure of claim 2, wherein the radial stop comprises at least two through-holes, one end of the post-release control passing through one through-hole before passing through the distal connection and through another through-hole after passing through the distal connection, the one through-hole being closer to the distal end of the conveyor than the other through-hole.
4. The rear release mechanism of claim 1, wherein the conveyor is provided with at least one rear release restraint securing aperture, the other end of the rear release restraint being secured to the rear release restraint securing aperture.
5. The rear release mechanism of claim 1, wherein the cone head is provided with a blind hole, and wherein one end of the rear release control member is fixed to the blind hole.
6. A delivery device comprising a conveyor and a post-release structure according to any one of claims 1-5; the conveyor includes a conical head.
7. The delivery device of claim 6, wherein the delivery device further comprises a transition tube, the cone head is positioned at a proximal end of the transition tube, a radial stop and a rear release constraint fixture hole are provided on the transition tube, and a blind hole is provided on the cone head;
The radial limiting part is used for limiting the displacement of the distal end connecting part in the radial direction of the bracket, the fixing hole of the rear release constraint part is fixed with the other end of the rear release constraint part, and the blind hole is fixed with one end of the rear release control part.
8. The delivery device of claim 7, wherein the delivery device further comprises a main control member, wherein the support is provided with a plurality of binding coils, and one end of the main control member sequentially passes through the plurality of binding coils from the distal end to the proximal end of the support, passes through the radial limiting portion, and is inserted into the blind hole to be fixed.
9. A stent system comprising a delivery device as claimed in any one of claims 6 to 8 and a stent, the proximal end of the stent being provided with at least one proximal connection, each proximal connection having a through hole for cooperation with the rear release structure to effect detachable connection of the proximal end of the stent to a delivery device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710912006.XA CN109567981B (en) | 2017-09-29 | 2017-09-29 | Support system, conveying device thereof, rear release structure and support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710912006.XA CN109567981B (en) | 2017-09-29 | 2017-09-29 | Support system, conveying device thereof, rear release structure and support |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109567981A CN109567981A (en) | 2019-04-05 |
| CN109567981B true CN109567981B (en) | 2024-09-20 |
Family
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021129286A1 (en) * | 2019-12-23 | 2021-07-01 | 杭州唯强医疗科技有限公司 | Covered stent system and covered stent thereof |
| CN113069258B (en) * | 2021-06-07 | 2022-02-08 | 上海微创心脉医疗科技(集团)股份有限公司 | Conveyor and medical device |
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| CN104586537A (en) * | 2013-10-31 | 2015-05-06 | 微创心脉医疗科技（上海）有限公司 | Covered stent |
| CN104706449A (en) * | 2013-12-17 | 2015-06-17 | 微创心脉医疗科技（上海）有限公司 | Stent delivery system and later releasing assembly thereof |
| CN208552127U (en) * | 2017-09-29 | 2019-03-01 | 微创心脉医疗科技（上海）有限公司 | Support system and its conveying device, rear release structure and bracket |
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| US8292943B2 (en) * | 2003-09-03 | 2012-10-23 | Bolton Medical, Inc. | Stent graft with longitudinal support member |
| US8876877B2 (en) * | 2009-04-23 | 2014-11-04 | Medtronic Vascular, Inc. | Centering for a TAA |
| CN102961198B (en) * | 2012-10-31 | 2015-06-10 | 普霖医疗科技(广州)有限公司 | Covered stent conveyor |
| US10350096B2 (en) * | 2012-12-26 | 2019-07-16 | Cook Medical Technologies Llc | Expandable stent-graft system having diameter reducing connectors |
| US9095463B2 (en) * | 2013-02-21 | 2015-08-04 | Medtronic Vascular, Inc. | Stent-graft delivery having a tip capture mechanism with elongated cables for gradual deployment and repositioning |
| CN203619729U (en) * | 2013-12-17 | 2014-06-04 | 微创心脉医疗科技（上海）有限公司 | Stent conveying system and rear release component thereof |
| CN105943213B (en) * | 2015-12-23 | 2019-01-04 | 微创心脉医疗科技（上海）有限公司 | Stent delivery system and its application method |
| CN105943211A (en) * | 2015-12-23 | 2016-09-21 | 微创心脉医疗科技（上海）有限公司 | Stent delivering system and back releasing assembly thereof |
| CN106473835B (en) * | 2016-10-11 | 2019-04-19 | 有研医疗器械（北京）有限公司 | Branched membrane-covered support and its transportation system and method for releasing |
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| CN104586537A (en) * | 2013-10-31 | 2015-05-06 | 微创心脉医疗科技（上海）有限公司 | Covered stent |
| CN104706449A (en) * | 2013-12-17 | 2015-06-17 | 微创心脉医疗科技（上海）有限公司 | Stent delivery system and later releasing assembly thereof |
| CN208552127U (en) * | 2017-09-29 | 2019-03-01 | 微创心脉医疗科技（上海）有限公司 | Support system and its conveying device, rear release structure and bracket |
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