CN114305570A - Conveyor and stent system - Google Patents
Conveyor and stent system Download PDFInfo
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- CN114305570A CN114305570A CN202210205732.9A CN202210205732A CN114305570A CN 114305570 A CN114305570 A CN 114305570A CN 202210205732 A CN202210205732 A CN 202210205732A CN 114305570 A CN114305570 A CN 114305570A
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- A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
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Abstract
The invention relates to a conveying device and a stent system, which comprise an outer sheath tube, a multi-cavity tube and an inner catheter, wherein the multi-cavity tube is provided with a fixed cavity and a guide cavity which are axially communicated, the multi-cavity tube comprises a main body section and a reducing section positioned at the far end of the main body section, the diameter of the reducing section is smaller than that of the main body section, an accommodating gap is formed between the outer wall of the reducing section and the inner wall of the outer sheath tube, the inner catheter is sleeved in the fixed cavity and is relatively fixed with the multi-cavity tube, the far end of the inner catheter extends out from the far end of the multi-cavity tube, and the multi-cavity tube and the inner catheter are simultaneously and movably arranged in the inner cavity of the outer sheath tube along the axial direction of the outer sheath tube. Above-mentioned conveyor and stent system, the inflection section that forms when branch sheath control seal wire inflection is held in this accommodation clearance, can not reduce the maximum diameter of outer sheath pipe effectively under the condition of the diameter of multicavity pipe, reduces the wound, be suitable for more patients, enlarge the adaptation disease scope, and it is more convenient that the doctor uses during the operation, the operation is simpler.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a conveying device and a bracket system.
Background
The aorta diseases such as aortic aneurysm, aortic dissection and the like are one of the most fatal vascular surgical diseases with the highest treatment difficulty, and the coated metal stent performs the intracavity repair (EVAR) on the aortic dissection, so that the coated metal stent is a minimally invasive and simple interventional operation method which is developed in recent years and aims at high-risk patients with thoracic aortic dissection and abdominal aortic dissection. However, common complications related to EVAR treatment include graft-to-graft endoleak, graft displacement, etc., and to solve this problem, a bifurcated stent graft (including a left stent leg and a right stent leg) can be used to treat an abdominal aortic aneurysm lesion, and the bifurcated stent graft is delivered to the lesion site of the aorta through incisions of the left and right femoral arteries by a delivery device, so as to protect the lesion vessels and repair the aortic lesion.
Bifurcated type covered stent's structural feature contains support left leg and support right leg simultaneously, because support left leg and support right leg exist simultaneously, outer sheath pipe external diameter is all great relatively in the conveyor who is applicable to bifurcated type covered stent at present, this is compared in the conveyor who carries ordinary covered stent, need do great incision on femoral artery in the transportation process, thereby lead to leading to causing great wound for the patient, it is high to patient's femoral artery requirement, it is few to lead to applicable patient, the adaptation disease scope is little, and the conveyor of great diameter also hardly adapts to in intravascular movement, use when the doctor operates hard, the operation is complicated.
Disclosure of Invention
In view of the above, it is necessary to provide a delivery device and a stent system for solving the problem that a delivery device suitable for delivering a bifurcated stent graft has a large diameter.
The present invention provides a delivery device for delivering bifurcated stents, the delivery device comprising:
an outer sheath tube;
a branch sheath for constraining a branch section of a bifurcated stent, the branch sheath having a branch sheath control guidewire disposed thereon, the branch sheath control guidewire configured for withdrawal of the branch sheath;
a multi-lumen tube having a fixation lumen and a guide lumen therethrough in an axial direction, the multi-lumen tube including a main body segment and a reducer segment at a distal end of the main body segment, the reducer segment having a diameter smaller than a diameter of the main body segment, an accommodating gap being formed between an outer wall of the reducer segment and an inner wall of the outer sheath tube to enable the branch sheath control guidewire to be folded back in the accommodating gap, the guide lumen being configured for passage of a stent control guidewire;
an inner catheter sleeved in the fixed cavity and fixed relative to the multi-cavity tube, wherein the distal end of the inner catheter extends out of the distal end of the multi-cavity tube, and the multi-cavity tube and the inner catheter are simultaneously and movably arranged in the inner cavity of the outer sheath tube along the axial direction of the outer sheath tube.
In one embodiment, the radial distance between the outer wall of the main body segment and the inner wall of the outer sheath is less than the diameter of the branch sheath control guidewire; and/or the presence of a gas in the gas,
the radial distance between the outer wall of at least one part of the section of the reducing section and the inner wall of the outer sheath tube is larger than the diameter of the branch sheath control guide wire.
In one embodiment, the diameter of the variable diameter section decreases gradually from the proximal end to the distal end.
In one embodiment, the minimum diameter of the variable diameter section is larger than the diameter of the inner catheter, and the distal end of the variable diameter section is configured to abut the bifurcated stent in the collapsed state.
In one embodiment, the axis of the fixation lumen coincides with the axis of the multilumen tubing which fits coaxially with the inner catheter; and/or the presence of a gas in the gas,
the outer wall of the outer sheath tube is provided with a hydrophilic coating.
In one embodiment, the number of the guide cavities is two, the two guide cavities are isolated from each other, the stent control guide wire comprises a constraint guide wire and a release guide wire, the two guide cavities are respectively used for the constraint guide wire and the release guide wire to pass through, and the constraint guide wire is configured to be used for constraining the main frame section and one branch section of the bifurcation stent to a contraction state or releasing the main frame section and one branch section of the bifurcation stent to an expansion state; the release guidewire is configured for locking or releasing the bifurcated stent to or relative to the inner catheter.
In one embodiment, the branch sheath is further provided with a tether configured for tethering the other branch segment of the bifurcated stent to a contracted state or releasing to an expanded state, the tether configured for connecting the tethering guidewire.
In one embodiment, the proximal end of the branch sheath has a tapered section; and/or the presence of a gas in the gas,
the restriction piece is connected at the distal end of branch sheath pipe, branch sheath control seal wire is connected at the near end of branch sheath pipe, the near end of branch sheath control seal wire still is provided with the development component.
In one embodiment, the delivery device further comprises:
the guiding head is arranged at the far end of the inner catheter and is provided with an inner cavity which is axially communicated, and the inner cavity of the guiding head is communicated with the inner cavity of the inner catheter; and/or the presence of a gas in the gas,
the handle is provided with an inner cavity which is axially communicated, the far end of the handle is connected with the near end of the sheath tube, and the inner cavity of the handle is communicated with the inner cavity of the sheath tube.
The present invention also provides a rack system, comprising:
the conveying device;
a bifurcated stent configured to fit over the inner catheter.
Above-mentioned conveyor and stent system, the multicavity pipe is the structure that has main part section and reducing section, the accommodation clearance that forms between reducing section and the outer sheath pipe can make branch sheath control seal wire can carry out the inflection, just so can be under the condition that the diameter of multicavity pipe does not reduce, the maximum diameter of outer sheath pipe is dwindled effectively, the reduction of outer sheath pipe maximum diameter just means that the wound that causes for the patient can effectively reduce, make conveyor can be suitable for more patients, enlarge the adaptation disease scope, and also can adapt to more in the intravascular movement after conveyor's diameter reduces, it is more convenient to use when making the doctor perform the operation, the operation is simpler.
Drawings
Fig. 1 is a schematic structural diagram of a conveying device according to an embodiment of the present invention;
FIG. 2 is a schematic view of a portion of a delivery device according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a body section and a reducer section provided in accordance with an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a fixation chamber and a guide chamber provided in one embodiment of the present invention;
fig. 5 is a schematic structural view of a branch sheath, a tether and a branch sheath control guidewire according to an embodiment of the present invention.
Reference numerals:
001. a bifurcated stent; 002. a main frame section; 003. a branching section;
100. an outer sheath tube; 200. a multi-lumen tube; 300. an inner conduit; 400. a branch sheath tube; 500. a guide head; 600. a handle;
210. a main body section; 220. a diameter-changing section; 230. a fixed cavity; 240. a guide chamber;
231. a receiving gap;
410. a tie down; 420. a branch sheath control guidewire; 430. a tapered section; 440. a developing member;
421. the branch sheath controls the return section of the guidewire.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the 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 at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
To more clearly describe the structure of the delivery system, the term "distal" is defined herein to mean the end of the system distal to the operator during a surgical procedure, and "proximal" to mean the end of the system proximal to the operator during a surgical procedure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1 to 5, an embodiment of the present invention provides a delivery device for delivering a bifurcated stent 001, where the bifurcated stent 001 includes a main frame section 002 and two branch sections 003, the bifurcated stent 001 may be of different types mentioned above or may be configured as required by those skilled in the art, for example, the bifurcated stent 001 may be adapted to be introduced into an abdominal aorta via a femoral artery and placed in the abdominal aorta with the aid of X-rays, and the two branch sections 003 of the bifurcated stent 001 may be adapted to be placed in left and right iliac arteries respectively for release, and besides, the bifurcated stent 001 may be adapted to be used in similar situations, which are not described and limited herein.
The delivery device comprises an outer sheath 100, a multi-lumen 200, an inner catheter 300 and a branch sheath 400, wherein a branch sheath control guidewire 420 is arranged on the branch sheath 400, the branch sheath control guidewire 420 is configured for retracting the branch sheath 400, and the branch sheath 400 is used for restraining a branch section of a bifurcated stent. The multi-lumen tube 200 has a fixing lumen 230 and a guide lumen 240 running axially therethrough, the multi-lumen tube 200 includes a main body segment 210 and a reducer segment 220 located at a distal end of the main body segment 210, the diameter of the reducer segment 220 is smaller than that of the main body segment 210, an accommodating gap 231 is formed between an outer wall of the reducer segment 220 and an inner wall of the outer sheath tube 100, so that the branch sheath control guidewire 420 can be folded back in the accommodating gap 231, and the folded-back portion can be referred to as a folded-back segment 421 of the branch sheath control guidewire 420. The guide lumen 240 is configured for passing a stent control guide wire, the inner catheter 300 is sleeved in the fixing lumen 230 and fixed relative to the multi-lumen tube 200, wherein the distal end of the inner catheter 300 extends from the distal end of the multi-lumen tube 200, the multi-lumen tube 200 and the inner catheter 300 are movably disposed in the inner lumen of the outer sheath tube 100 along the axial direction of the outer sheath tube 100, and the inner lumen of the inner catheter 300 is configured for passing a main guide wire.
The delivery apparatus modifies the configuration of multilumen tubing 200 so that multilumen tubing 200 is no longer a straight barrel of uniform axial diameter, but rather has a tubular body configuration with a body section 210 and a reducer section 220, the diameters of body section 210 and reducer section 220 being different so that when multilumen tubing 200 is axially fitted within the lumen of outer sheath tube 100, the radial distance between the outer wall of body section 210 and the inner wall of outer sheath tube 100 is different from the radial distance between the outer wall of reducer section 220 and the inner wall of outer sheath tube 100, specifically a relatively larger receiving gap 231 may be formed between the outer wall of reducer section 220 and the inner wall of outer sheath tube 100, which receiving gap 231 may be used to receive branch sheath control guidewire 420.
In this regard, body segment 210 and reducer segment 220 may be integrally formed, i.e., the portion of multi-lumen tube 200 proximal to the distal end may have a smaller diameter than the other portions. The main body section 210 and the reducer section 220 may also be fixedly connected by welding or the like. In the present embodiment, the main body section 210 and the reducer section 220 are integrally formed.
When one of the branch sections 003 of the bifurcated stent 001 is contracted by the branch sheath 400, the branch sheath control guide wire 420 is positioned at the proximal end of the branch sheath 400, and at this time, the branch sheath control guide wire 420 needs to be folded back by 180 degrees so that the branch sheath control guide wire 420 faces the distal end and extends from the distal end of the outer sheath 100 to the outside of the outer sheath 100. When the multi-lumen tube 200 is a straight tube, sufficient radial clearance must be reserved between the outer wall of the multi-lumen tube 200 and the inner wall of the outer sheath tube 100 to allow 180 degree inflection of the branch sheath control guidewire 420, so that the inflection segment 421 of the branch sheath control guidewire 420 can have a space for accommodating, which is one of the root causes of the existing outer sheath tube having an excessively large outer diameter.
In the present application, the accommodation gap 231 formed between the reducing section 220 of the multi-lumen tube 200 and the outer sheath tube 100 can accommodate the branch sheath control guide wire 420, so that the bending section 421 formed when the branch sheath control guide wire 420 is bent back is accommodated in the accommodation gap 231, and thus the maximum diameter of the outer sheath tube 100 can be effectively reduced without reducing the diameter of the multi-lumen tube 200, and the reduction of the maximum diameter of the outer sheath tube 100 means that the trauma can be effectively reduced, so that the delivery device can be applied to more patients, and the adaptation disease range can be enlarged, and the delivery device can be more adapted to move in the blood vessel after the diameter is reduced, so that the use of the medical doctor is more convenient and the operation is simpler.
The outer diameter of the main body section 210 of the multi-lumen tube 200 may be set to 4.5mm to 5.2mm, the outer diameter of the main body section 210 may be set to 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5.0mm, 5.1mm and 5.2mm, the axial length of the variable diameter section 220 of the multi-lumen tube 200 may be set to 12mm to 15mm, the axial length of the variable diameter section 220 may be set to 12mm, 13mm, 14mm and 15mm, the outer diameter of the variable diameter section 220 of the multi-lumen tube 200 may be set to 3.3mm to 4.0mm, and the outer diameter of the main body section 210 may be set to 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm and 4.0 mm.
The outer diameter of the outer sheath 100 may be set to 5.0mm to 6.0mm, the outer diameter of the outer sheath 100 may be specifically 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, and 6.0mm, the inner diameter of the outer sheath 100 may be set to 4.9mm to 5.6mm, and the inner diameter of the outer sheath 100 may be specifically 4.9mm, 5.0mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, and 5.6 mm.
The diameter of the branch sheath control guidewire 420 may be set to 0.8mm to 1.2mm, and the diameter of the branch sheath control guidewire 420 may specifically be varied from 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1.0mm, 1.05mm, 1.1mm, 1.15mm and 1.2 mm. Those skilled in the art can select the sizes of the portions of the multi-lumen tube 200, the outer sheath tube 100, and the branch sheath control guidewire 420 according to the requirement, so as to form a matching structure, and to realize the accommodation of the folded section 421 of the branch sheath control guidewire 420 by the accommodation gap 231, which is not limited herein.
In one embodiment, the radial distance between the outer wall of the main body segment 210 and the inner wall of the outer sheath 100 is smaller than the diameter of the branch sheath control guidewire 420, and at this time, the radial distance between the outer wall of the main body segment 210 and the inner wall of the outer sheath 100 is sufficiently small, and the branch sheath control guidewire 420 cannot be squeezed into the gap between the outer wall of the main body segment 210 and the inner wall of the outer sheath 100, so that the branch sheath control guidewire 420 can be folded back easily and cannot be clamped between the gap between the multi-lumen tube 200 and the outer sheath 100, and then the branch sheath control guidewire 420 is extended out of the outer sheath 100 from the distal end of the outer sheath 100 and then folded back by 180 degrees to extend proximally, which can be convenient for the surgeon to operate.
For the formation of the accommodation gap 231, the radial distance between the outer wall of at least a part of the section of the reducing section 220 and the inner wall of the outer sheath 100 may be controlled to be larger than the diameter of the branch sheath control guidewire 420, so that the accommodation gap 231 for allowing the branch sheath control guidewire 420 to extend into can be formed, the reducing section 220 of the multi-lumen tube 200 may be a gradual diameter variation, a step-shaped diameter variation, or other diameter variations, as long as the radial distance between the outer wall of a part of the section of the reducing section 220 and the inner wall of the outer sheath 100 can be ensured to form the accommodation gap 231 for accommodating the branch sheath control guidewire 420, for example, in one embodiment, the diameter of the reducing section 220 is gradually reduced from the proximal end to the distal end, and the distal end of the reducing section 220 can easily extend into the branch sheath control guidewire 420, until the branch sheath control guidewire 420 is proximally advanced, it is restricted from further proximal advancement.
The section of the distal end of inner catheter 300 extending from the distal end of multi-lumen tube 200 is a section for receiving bifurcated stent 001, and the length of the section is defined to be sufficient to receive bifurcated stent 001 of a corresponding size, and in one embodiment, the minimum diameter of variable diameter section 220 is larger than the diameter of inner catheter 300, and the distal end of variable diameter section 220 is configured to abut bifurcated stent 001 in a contracted state, so that bifurcated stent 001 is abutted by the distal end of variable diameter section 220, and the assembly of bifurcated stent 001 is more stable.
In one embodiment, the axis of lumen 230 coincides with the axis of multilumen tubing 200, and multilumen tubing 200 is coaxially assembled with inner catheter 300. in addition, inner catheter 300 may be radially offset to some extent after being fitted within lumen 230 and fixed with respect to multilumen tubing 200, as long as the assembly of bifurcated stent 001 is ensured, and the coaxiality of the two is not strictly limited. Further, the outer wall of the sheath tube 100 may be provided with a hydrophilic coating, and by coating the outer wall of the sheath tube 100 with a hydrophilic coating, the smoothness of the delivery device in the blood vessel may be increased.
In one embodiment, the number of the guide cavities 240 is two, the two guide cavities 240 are isolated from each other, the stent control guide wire comprises a constraining guide wire and a releasing guide wire, the constraining guide wire and the releasing guide wire are movably arranged in the two guide cavities 240 respectively, the constraining guide wire is configured to constrain the main frame section 002 and one branch section 003 of the bifurcation stent 001 to a contracted state or to an expanded state, wherein the main frame section 002 and one branch section 003 of the bifurcation stent 001 can be sleeved on the distal end of the inner catheter 300 before the delivery device is delivered to the diseased blood vessel, the main frame section 002 and the branch section 003 are constrained to the contracted state by utilizing the constraining guide wire, and after the bifurcation stent 001 reaches the target position of the diseased blood vessel, the constraining guide wire is withdrawn to release the constraint of the main frame section 002 and the branch section 003, the main frame section 002 and the branch section 003 are released to the expanded state.
The release wire is configured to lock the bifurcated stent 001 to the inner catheter 300 or release it with respect to the inner catheter 300, and is mainly used to finally release the entire bifurcated stent 001, and the release wire is required to connect the bifurcated stent 001 to the distal end of the inner catheter 300 before the bifurcated stent 001 reaches the target position of the lesion blood vessel, so that the bifurcated stent 001 moves along with the inner catheter 300 in the lesion blood vessel, and when the bifurcated stent 001 reaches the target position of the lesion blood vessel and reaches the expanded state as a whole, the delivery device can be withdrawn to leave the bifurcated stent 001 in the lesion blood vessel, and at this time, the withdrawal release wire can separate the bifurcated stent 001 from the inner catheter 300, so that the bifurcated stent 001 is separated from the delivery device and stays in the lesion blood vessel.
It should be noted that in other embodiments, the number of the guiding cavities 240 may be one, and the stent control guidewire may include a binding guidewire. Alternatively, both the binding and release wires may be routed through the same guide lumen 240 of the multi-lumen tube 200, e.g., only one guide lumen 240 may be provided, in which case both the binding and release wires may be routed through the same guide lumen 240. In other embodiments, there may be a plurality of guide lumens 240, and there may be a plurality of constraining guide wires and a plurality of releasing guide wires respectively, and then different constraining guide wires and releasing guide wires may be respectively located in different guide lumens 240, and further, the number of the guide lumens 240 may be 2N, where N is an integer, the plurality of guide lumens 240 are uniformly distributed along the circumference of the multi-lumen tube 200, and the constraining guide wires and the releasing guide wires are respectively disposed through different guide lumens 240.
In one embodiment, a constraining member 410 is further disposed on the branch sheath 400, the branch sheath 400 is configured to constrain the other branch segment 003 of the bifurcated stent 001 to a contracted state or to release to an expanded state, the constraining member 410 is connected to the branch sheath 400, and the constraining member 410 is configured to connect the constraining guide wire, thereby preventing the branch sheath from slipping off.
The binding piece 410 can be a linear piece, the thread end of the binding piece 410 can penetrate through the bifurcation stent 001 during assembly and then forms a connection with a binding guide wire for binding the bifurcation stent 001, so that the branch sheath 400 is prevented from slipping off on the bifurcation stent 001, one end of the branch sheath control guide wire 420 can be fixed with the branch sheath 400 during assembly, the other end of the branch sheath control guide wire 420 can be exposed out of the conveying device after being folded back, an operator can conveniently withdraw the branch sheath 400 and release the corresponding branch segment 003 to an expanded state, and the binding piece 410 is connected with the binding guide wire, so that the branch sheath control guide wire 420 can be withdrawn simultaneously during withdrawing the binding guide wire, and further, the main frame segment 002 and the two branch segments 003 of the bifurcation stent 001 can be released simultaneously, and the accuracy and the safety of the operation can be effectively improved.
The branch sheath 400 can be a coated tube body, the branch sheath 400 is sleeved on the branch section 003 to be capable of constraining the corresponding branch section 003 to a contraction state, and is compressed in the inner cavity of the sheath 100 in parallel with the main frame section 002 and the other branch section 003 of the bifurcation stent 001, so that when the conveying device is guided into a target position of a diseased vessel, the positioning of the bifurcation stent 001 can be assisted, and the accuracy and the safety of the operation can be improved.
In one embodiment, the proximal end of the branch sheath 400 has a tapered section 430, and the tapered section 430 may cooperate with the tapered section 220, so as to prevent the proximal end of the branch sheath 400 from occupying the space of the accommodating gap 231 as much as possible when the proximal end of the branch sheath 400 approaches the tapered section 220, thereby avoiding the folding back of the folded-back section 421 of the branch sheath control guidewire 420 in the accommodating gap 231. Wherein the tie 410 may be connected to the distal end of the branch sheath 400 to facilitate the connection of the tie 410 with a tie guidewire on the bifurcated stent 001, and the branch sheath control guidewire 420 may be connected to the proximal end of the branch sheath 400 to facilitate the extension of the branch sheath control guidewire 420 proximally to fold back within the receiving gap 231.
The proximal end of the branch sheath control guide wire 420 is further provided with a developing element 440, the developing element 440 can be as close to the branch sheath 400 as possible, the developing element 440 can adopt a structure such as a developing ring suitable for being arranged on the branch sheath control guide wire 420, and the developing element 440 can be distributed on the branch sheath control guide wire 420 in a plurality of arrays, so that the position of the branch sheath 400 can be conveniently determined in the operation process.
In one embodiment, the delivery device further comprises a guide head 500 disposed at the distal end of the inner catheter 300, the guide head 500 has an inner cavity penetrating axially, the inner cavity of the guide head 500 is communicated with the inner cavity of the inner catheter 300, at this time, a main guide wire can pass through the inner cavity of the guide head 500 and the inner cavity of the inner catheter 300 and extend out from the distal end of the guide head 500, the distal end of the bifurcated stent 001 is connected with the guide head 500, the delivery device can be delivered into a diseased blood vessel through the main guide wire, and the problem of accurate release of the bifurcated stent 001 can be solved, wherein the guide head 500 has a tapered structure and can guide the delivery device to smoothly advance in the blood vessel.
In one embodiment, the delivery device further includes a handle 600 having an inner cavity extending axially therethrough, a distal end of the handle 600 is connected to a proximal end of the sheath tube 100, the inner cavity of the handle 600 is communicated with the inner cavity of the sheath tube 100, the handle 600 can assist an operator to stably hold the entire delivery device, and a person skilled in the art can select a type and a structure of the handle 600 according to requirements, so that the handle 600 can also be used for controlling various links such as releasing the bifurcated stent 001 and withdrawing the delivery system, and the like, which is not limited herein.
A stent system comprising the delivery device and a bifurcated stent 001, the bifurcated stent 001 configured for fitting over the inner catheter 300. Since the detailed structure, functional principle and technical effect of the conveying device are described in detail in the foregoing, detailed description is omitted here, and any technical content related to the conveying device can refer to the above description.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A delivery device for delivering bifurcated stents, the delivery device comprising:
an outer sheath tube;
a branch sheath for constraining a branch section of a bifurcated stent, the branch sheath having a branch sheath control guidewire disposed thereon, the branch sheath control guidewire configured for withdrawal of the branch sheath;
a multi-lumen tube having a fixation lumen and a guide lumen therethrough in an axial direction, the multi-lumen tube including a main body segment and a reducer segment at a distal end of the main body segment, the reducer segment having a diameter smaller than a diameter of the main body segment, an accommodating gap being formed between an outer wall of the reducer segment and an inner wall of the outer sheath tube to enable the branch sheath control guidewire to be folded back in the accommodating gap, the guide lumen being configured for passage of a stent control guidewire;
an inner catheter sleeved in the fixed cavity and fixed relative to the multi-cavity tube, wherein the distal end of the inner catheter extends out of the distal end of the multi-cavity tube, and the multi-cavity tube and the inner catheter are simultaneously and movably arranged in the inner cavity of the outer sheath tube along the axial direction of the outer sheath tube.
2. The delivery device of claim 1, wherein a radial distance between an outer wall of the main body segment and an inner wall of the outer sheath is less than a diameter of the branch sheath control guidewire; and/or the presence of a gas in the gas,
the radial distance between the outer wall of at least one part of the section of the reducing section and the inner wall of the outer sheath tube is larger than the diameter of the branch sheath control guide wire.
3. The delivery device of claim 1, wherein the tapered section tapers in diameter in a proximal to distal direction.
4. The delivery device of claim 1, wherein a minimum diameter of the tapered section is greater than a diameter of the inner catheter, a distal end of the tapered section being configured to abut the bifurcated stent in a collapsed state.
5. The delivery device according to claim 1, wherein the axis of the fixation lumen coincides with the axis of the multilumen tubing which fits coaxially with the inner catheter; and/or the presence of a gas in the gas,
the outer wall of the outer sheath tube is provided with a hydrophilic coating.
6. The delivery device according to claim 1, wherein the number of the guide lumens is two, the two guide lumens are isolated from each other, the stent control guidewire comprises a constraining guidewire and a releasing guidewire, the two guide lumens are respectively used for passing the constraining guidewire and the releasing guidewire, and the constraining guidewire is configured to constrain the main frame section and one branch section of the bifurcation stent to a contraction state or release the main frame section and the branch section to an expansion state; the release guidewire is configured for locking or releasing the bifurcated stent to or relative to the inner catheter.
7. The delivery device of claim 6, wherein a tether is further disposed on the branch sheath, the branch sheath configured for constraining the other branch segment of the bifurcated stent to a contracted state or releasing to an expanded state, the tether configured for connecting with the tether guidewire.
8. The delivery device of claim 7, wherein the proximal end of the branch sheath has a tapered section; and/or the presence of a gas in the gas,
the restriction piece is connected at the distal end of branch sheath pipe, branch sheath control seal wire is connected at the near end of branch sheath pipe, the near end of branch sheath control seal wire still is provided with the development component.
9. The delivery device of any of claims 1-8, further comprising:
the guiding head is arranged at the far end of the inner catheter and is provided with an inner cavity which is axially communicated, and the inner cavity of the guiding head is communicated with the inner cavity of the inner catheter; and/or the presence of a gas in the gas,
the handle is provided with an inner cavity which is axially communicated, the far end of the handle is connected with the near end of the sheath tube, and the inner cavity of the handle is communicated with the inner cavity of the sheath tube.
10. A mounting system, comprising:
the delivery device of any one of claims 1-9;
a bifurcated stent configured to fit over the inner catheter.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210205732.9A CN114305570B (en) | 2022-03-04 | 2022-03-04 | Conveyor and stent system |
| PCT/CN2023/070824 WO2023165261A1 (en) | 2022-03-04 | 2023-01-06 | Delivery apparatus and stent system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210205732.9A CN114305570B (en) | 2022-03-04 | 2022-03-04 | Conveyor and stent system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114305570A true CN114305570A (en) | 2022-04-12 |
| CN114305570B CN114305570B (en) | 2022-05-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210205732.9A Active CN114305570B (en) | 2022-03-04 | 2022-03-04 | Conveyor and stent system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114305570B (en) |
| WO (1) | WO2023165261A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023165261A1 (en) * | 2022-03-04 | 2023-09-07 | 上海微创心脉医疗科技(集团)股份有限公司 | Delivery apparatus and stent system |
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| AU2009200350B1 (en) * | 2009-02-02 | 2009-07-16 | Cook Incorporated | Preloaded stent graft delivery device |
| CN114305570B (en) * | 2022-03-04 | 2022-05-20 | 上海微创心脉医疗科技(集团)股份有限公司 | Conveyor and stent system |
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| CN101897629A (en) * | 2009-05-26 | 2010-12-01 | 微创医疗器械(上海)有限公司 | Branched membrane-covered support conveying system and conveying method thereof |
| CN102370532A (en) * | 2010-08-13 | 2012-03-14 | 黄连军 | Collateral type tectorial membrane support frame conveyor as well as installing method and release method thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2023165261A1 (en) | 2023-09-07 |
| CN114305570B (en) | 2022-05-20 |
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