CN113749834A - Stent delivery system - Google Patents
Stent delivery system Download PDFInfo
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- CN113749834A CN113749834A CN202111029161.XA CN202111029161A CN113749834A CN 113749834 A CN113749834 A CN 113749834A CN 202111029161 A CN202111029161 A CN 202111029161A CN 113749834 A CN113749834 A CN 113749834A
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- stent delivery
- microcatheter
- short
- stent
- core wire
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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
- A61F2/95—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
Abstract
The present invention provides a stent delivery system, comprising: a guidewire lumen for establishing a passageway in a blood vessel; the short microcatheter is used for accommodating the bracket, and the distal end of the short microcatheter is fixedly connected with the proximal end of the lumen of the guide head; a core wire for advancing the stent delivery system; the core wire is inserted into and penetrates through the lumen of the guide head and the short microcatheter and is fixedly connected with the lumen of the guide head and/or the short microcatheter; the stent delivery tube is sleeved on the core wire and is suitable for being inserted into and pulled out of the short microcatheter; the far end of the bracket delivery pipe is provided with a bracket limiting part so as to limit the bracket at the near end side of the bracket limiting part; and a stent adapted to be fitted over the stent delivery tube, to be crimped between the short microcatheter and the stent delivery tube as the stent delivery tube is inserted into the short microcatheter, and to be released from the stent delivery tube when the stent delivery tube is removed from the short microcatheter. The invention integrates the functions of the micro guide wire and the micro catheter, reduces the using amount of instruments and saves the operation time.
Description
Technical Field
The present invention relates to a stent delivery system.
Background
Generally, a stent or a spring ring product is selected for treating bleeding and ischemic cerebrovascular diseases, and a general operation strategy is to establish a passage, then deliver devices such as the stent or the spring ring to a diseased part, push out the stent or the spring ring and complete an operation.
The disadvantages of the above process are: on the one hand, during surgery, instruments such as guide wires, intermediate catheters, microcatheters, delivery systems and stents or coils are required. More instruments are used, the process is more complicated, and the operation time is long. On the other hand, the release process of the stent is usually realized by pushing the stent out of the microcatheter, the delivery resistance is large, and the operation risk is increased.
Disclosure of Invention
To overcome the drawbacks of the prior art, it is an object of the present invention to provide a stent delivery system that does not require the use of a guide wire and a microcatheter to establish access, but has the function of a guide wire to establish access, and at the same time has the function of a microcatheter to bind the stent, which is released at the end of the short microcatheter near the operator.
To achieve the above objects, the present invention discloses a stent delivery system. The stent delivery system includes: a seeker lumen for establishing a pathway in a blood vessel, comprising a flat tubular lumen section near a distal end and a tapered tubular lumen section near a proximal end; a short microcatheter for receiving the stent; the distal end of the short microcatheter is fixedly connected with the proximal end of the cavity of the guide head; a core wire for advancing the stent delivery system; the core wire is inserted into and penetrates through the cavity of the guide head and the short microcatheter and is fixedly connected with the cavity of the guide head and/or the short microcatheter; a stent delivery tube sleeved on the core wire and adapted to slide along the core wire to insert and remove the short microcatheter; the far end of the bracket delivery pipe is provided with a bracket limiting part; and a stent having a contracted state and a fully expanded state; the stent is suitable for being sleeved on the stent delivery tube, is squeezed between the short microcatheter and the stent delivery tube as the stent delivery tube is inserted into the short microcatheter and is in a contracted state under the restraint of the stent delivery tube; when the stent delivery tube is moved out of the proximal end of the short microcatheter, the stent is gradually exposed out of the short microcatheter from the proximal end to the distal end under the driving of the stent delivery tube, so that the stent gradually expands from the proximal end to the distal end in a radial direction to the full expansion state.
Preferably, the guide head lumen is formed by winding a metal wire.
Preferably, the straight tube lumen segment has a first diameter; the short microcatheter has a second diameter greater than the first diameter; the tapered lumen section gradually increases in diameter in a proximal direction from a first diameter to a second diameter.
Preferably, the inner diameter of the cavity section of the flat pipe is larger than or equal to the diameter of the core wire, and the inner surface of the cavity section of the flat pipe is fixedly connected with the core wire. More preferably, the inner diameter of the straight tube cavity section is larger than the diameter of the core wire, and the unilateral gap between the core wire and the inner surface of the straight tube cavity section is 0.02-0.05 mm.
Preferably, the stent delivery system further comprises a connecting ring, wherein the connecting ring is sleeved on the core wire and is positioned at the connecting part of the guide head lumen and the short microcatheter; the connecting ring is respectively and fixedly connected with the core wire, the cavity of the guide head and the short microcatheter.
Preferably, the guide head lumen, the connecting ring and the bracket limiting component are all made of materials including developing materials.
Preferably, the proximal end of the core wire is provided with a marker band for indicating that the stent has been completely exposed outside the short microcatheter and is in a fully expanded state when the proximal end of the stent delivery tube is moved proximally relative to the core wire to reach the marker band.
Preferably, the distal end of the core wire is flush with the distal end of the lumen of the guide head, and a hemispherical convex head is formed by laser melting or soldering or dispensing.
Preferably, the nose has a diameter greater than or equal to the outer diameter of the distal end of the lumen of the guide tip.
Preferably, the core wire comprises a first straight section, a conical reducing section and a second straight section from the far end to the near end in sequence; the first straight section has a third diameter, the second straight section has a fourth diameter greater than the third diameter, and the tapered section gradually increases in diameter in a proximal direction from the third diameter to the fourth diameter.
Preferably, the stent delivery tube is a variable-diameter hypotube; the reducing hypotube comprises a distal part, a secondary proximal part and a proximal part which are sequentially connected; the distal portion is clearance fit with the first straight section of the core wire; the proximal portion is clearance fit with the second straight section of the core wire; the secondary proximal portion is tapered for achieving a smooth transition between the distal and proximal portions; the length of the second proximal portion is greater than the length of the tapered section of the core wire.
Preferably, a distal end portion of the variable-diameter hypotube has a cutting groove, and a sub-proximal end portion and a proximal end portion of the variable-diameter hypotube do not have a cutting groove.
Preferably, the distance between adjacent cutting grooves of the distal end part of the variable diameter hypotube gradually increases from the distal end to the proximal end.
Preferably, the stent delivery tube further comprises a plurality of support tubes which are sleeved on the stent delivery tube at intervals along the extension direction of the stent delivery tube; the stent is crimped between the short microcatheter and the plurality of support tubes as the stent delivery tube is inserted into the short microcatheter.
Preferably, the plurality of support tubes are polymer tubes.
Preferably, the total length of the core wire is 1800-2200 mm; the length of the short micro-catheter is 50-150 mm; the length of the cavity section of the straight pipe is 5-150 mm; the length of the conical cavity section is 10-50 mm.
Compared with the prior art, the invention has the following advantages:
1. existing surgical procedures typically include the following steps: (1) firstly, establishing a passage by using a loach guide wire, and enabling the far end of the loach guide wire to reach the part above the internal carotid artery by an operator by controlling the near end of the loach guide wire; (2) leading the middle catheter to reach C3 and C4 sections of internal carotid artery along the loach guide wire; (3) withdrawing the loach guide wire, and passing through the micro guide wire on the inner cavity of the middle catheter to reach the far end of the target blood vessel; (4) the microcatheter is arranged on the microcatheter, the microcatheter reaches the far end of the target blood vessel, and the microcatheter is withdrawn; (5) the stent is guided into the microcatheter, pushed to the distal end along the microcatheter, released at the distal end of the target vessel, and finally released at the target vessel location. The invention integrates the functions of a micro guide wire and a micro catheter, and does not need to establish a passage by respectively using the micro guide wire and the short micro catheter. The conveying system integrates the functions of the micro guide wire and the micro catheter by fixedly connecting the cavity of the guide head, the short micro catheter and the core wire, and reduces the using amount of instruments. Meanwhile, as the invention integrates the functions of the micro guide wire and the micro catheter, the above (3) - (5) can be combined into one step, thereby saving the operation time of 5-10 minutes and reducing the operation risk.
2. The core wire is combined with the cavity of the guide head wound by the metal wire, so that the shaping according to the blood vessel condition can be facilitated, and the blood vessel super-selection is realized.
3. The stent releases the stent from the proximal end of the short microcatheter by pulling back the stent delivery tube relative to the core wire, changes the form that the former relative motion is the release of pushing the stent, reduces the delivery resistance and reduces the operation risk.
4. The reducing design of the core wire can enhance the support and mechanical transmission efficiency of the conveying system.
5. The variable diameter design of the stent delivery tube and the design that the distance between adjacent cutting grooves is gradually increased from the far end to the near end can enhance the support performance and the mechanical transmission efficiency of the delivery system.
6. The release of the stent from the short microcatheter can be visually identified by arranging a marker band at the proximal end of the core wire.
Drawings
The embodiments of the invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:
FIG. 1 shows a cross-sectional view of a stent delivery system of the present invention.
Fig. 2 shows a cross-sectional view of a guidewire introducer sheath of the stent delivery system of the present invention.
Fig. 3 shows a cross-sectional view of a stent delivery tube of the stent delivery system of the present invention.
FIGS. 4a-4c are schematic diagrams of a stent preloading procedure for the stent delivery system of the present invention; wherein, fig. 4a corresponds to the situation where the stent is located outside the short microcatheter; FIG. 4b corresponds to the situation where the stent is partially inserted into a short microcatheter; fig. 4c corresponds to the situation where the stent is fully inserted into a short microcatheter.
FIGS. 5a-5c are schematic views illustrating a stent release process of the stent delivery system of the present invention; wherein FIG. 5a corresponds to the situation where the stent has just begun to be released; FIG. 5b corresponds to the situation in which the stent is fully released; fig. 5c corresponds to the situation when the other parts than the stent are withdrawn after the stent release is completed.
Detailed Description
The technical solution of the present invention will be described in further detail below by way of examples with reference to the accompanying drawings, but the present invention is not limited to the following examples.
Before describing in detail the embodiments of the present invention, the terms to which the present invention relates are explained as follows:
"proximal" refers to the end proximal to the operator and "distal" refers to the end distal to the operator.
Referring to fig. 1-3, the stent delivery system of the present invention generally comprises a guidewire lumen 1, a short microcatheter 5, a core wire 6, a stent delivery tube 8 and a stent 7. The guide head lumen 1 is used for establishing a passage in a blood vessel, the short microcatheter 5 is used for accommodating a stent, and the distal end of the short microcatheter 5 is fixedly connected with the proximal end of the guide head lumen 1. The core wire 6 is used for advancing the stent delivery system, and the core wire 6 is inserted into and penetrates through the guide head lumen 1 and the short microcatheter 5 and is fixedly connected with the guide head lumen 1 and/or the short microcatheter 5. The stent delivery tube 8 is sleeved on the core wire 6 and adapted to slide along the core wire for insertion and removal of the short microcatheter 5. The far end of the bracket delivery pipe 8 is provided with a bracket limiting part 3. In this embodiment, the support limiting component 3 is a limiting ring sleeved on the distal end of the reducing hypotube 8, so as to limit the support 7 on the proximal side of the support limiting component 3. In other embodiments, the stent position limiter 3 may be implemented by other forms, such as one or more position limiting plates disposed perpendicular to the stent delivery tube 8 at the distal end of the stent delivery tube 8, etc. As in other embodiments, the bracket stop member 3 may also be a stop groove for receiving the bracket 7. The stent 7 has a contracted state and a fully expanded state, is suitable for being sleeved on the stent delivery tube 8, is squeezed between the short microcatheter 5 and the stent delivery tube 8 along with the insertion of the stent delivery tube 8 into the short microcatheter 5, and is in the contracted state under the restraint of the stent delivery tube; and when the stent delivery tube 8 moves out of the short microcatheter 5, the stent 7 is gradually exposed out of the short microcatheter 5 from the proximal end to the distal end under the driving of the stent delivery tube 8, so as to gradually radially expand from the proximal end to the distal end to the fully expanded state, and then is released from the stent delivery tube 8. In this embodiment, the stent 7 is a self-expanding stent (e.g., including, but not limited to, a self-expanding cut stent or a self-expanding braided stent), the body of which is typically made of a nickel-titanium material or other superelastic material.
In particular, the seeker lumen 1 comprises a flat tubular lumen section near the distal end and a tapered tubular lumen section near the proximal end. Wherein the straight lumen section of the seeker lumen 1 has a first diameter, the short microcatheter 5 has a second diameter greater than the first diameter, and the diameter of the tapered lumen section of the seeker lumen 1 gradually increases from the first diameter to the second diameter in a proximal direction. Preferably, the seeker lumen 1 is wound from wire.
The short microcatheter 5 typically comprises an inner layer, an intermediate layer, and an outer layer, wherein the intermediate layer is typically a metal braid or a metal coil spring layer, and the stiffness gradually decreases from the inner layer to the outer layer. Preferably, the middle layer of the short microcatheter 5 and the lumen 1 of the guide head are fixedly connected by welding. In other embodiments, the introducer lumen 1 and the short microcatheter 5 may be fixedly connected by other means, such as gluing, mechanical clamping, etc. The inner diameter of the straight tube cavity section of the seeker tube cavity 1 is equal to or larger than the diameter of the core wire 6, and the inner surface of the straight tube cavity section of the seeker tube cavity 1 is fixedly connected with the core wire 6. In the case where the inner diameter of the straight tube lumen section of the seeker lumen 1 is greater than the diameter of the core wire 6, the inner diameter of the straight tube lumen section is typically no greater than 150% of the diameter of the core wire 6. In this embodiment, when the inner diameter of the straight tube lumen segment is larger than the diameter of the core wire 6, the unilateral gap between the core wire and the inner surface of the straight tube lumen segment is 0.02-0.05 mm. Such a gap ensures that assembly is accomplished smoothly, which would be difficult if there were no gap. In addition, if the gap exists, a connecting medium such as glue, tin solder and the like can be allowed to enter the gap, and the connecting strength is ensured.
Preferably, the stent delivery system further comprises a connection ring 2, the connection ring 2 is sleeved on the core wire 6 and is preferably located at the connection position of the guide head lumen 1 and the short microcatheter 5, and the connection ring 2 is fixedly connected with the core wire 6, the guide head lumen 1 and the short microcatheter 5 respectively. Through setting up go-between 2, can play support and spacing effect to core silk 6. Meanwhile, the connection ring 2 is preferably made of a metal material, so as to be better fixedly connected with the core wire 6, the guide head lumen 1 and the middle layer of the short microcatheter 5 which are made of the metal material in a welding mode.
By the mode, the guide head lumen 1, the short microcatheter 5 and the core wire 6 are organically combined together, so that the stent delivery system disclosed by the invention is ensured to integrate the functions of the microcatheter and the microcatheter, a passage is not required to be established by respectively using the microcatheter and the short microcatheter, and the using amount of instruments is reduced. Meanwhile, because the micro guide wire and the micro catheter do not need to be used respectively, the steps of withdrawing the micro guide wire and further feeding the micro catheter after the micro guide wire is withdrawn are reduced, the operation time of 5-10 minutes can be saved, and the operation risk is reduced. Meanwhile, the guide head lumen 6 formed by winding the metal wire has good bending capability, and the support property of the core wire 6 is combined, so that an operator can conveniently shape according to the blood vessel condition, and the blood vessel reselection is realized. Preferably, the total length of the core wire 6 is 1800-2200mm, the length of the short microcatheter 5 is 50-150mm, the length of the flat tube cavity section is preferably 5-150mm, and the length of the conical tube cavity section is preferably 10-50 mm. More preferably, the length of the straight tube cavity section is 100mm, and the length of the conical tube cavity section is 30 mm.
Preferably, the guide head lumen 1, the connecting ring 2 and the stent spacing component 3 are all made of materials including developing materials, so as to facilitate the development positioning for the delivery and release of the stent 7 in the stent delivery system.
Preferably, the proximal end of the core wire 6 is provided with a marker band 9 for indicating that the stent 7 has been removed from the short microcatheter 5 and is in a fully expanded state, i.e. the stent 7 has been released from the stent delivery tube 8, when the proximal end of the stent delivery tube 8 is moved in the proximal direction relative to the core wire 6 to reach said marker band 9.
In this embodiment, as shown in fig. 1, the distal end of the core wire 6 is flush with the distal end of the lumen of the guide tip, and a hemispherical protrusion is formed by laser melting, soldering or dispensing, so that the core wire 6 is fixedly connected with the distal end of the lumen 1 of the guide tip. The diameter of the raised head is equal to or larger than the outer diameter of the far-end part of the cavity 1 of the guide head, and the semicircular raised head can reduce the damage to the blood vessel while ensuring the limiting effect. In the case where the nose has a diameter greater than the outer diameter of the distal end of the introducer lumen 1, the diameter of the nose is typically no greater than 150% of the outer diameter of the distal end of the introducer lumen 1.
Furthermore, the core wire 6 preferably has a diameter-variable structure, i.e. the core wire 6 comprises a first straight section, a tapered diameter-variable section and a second straight section in sequence from the distal end to the proximal end. Wherein the first straight section has a third diameter, the second straight section has a fourth diameter greater than the third diameter, and the tapered section gradually increases in diameter in a proximal direction from the third diameter to the fourth diameter. Preferably, the marker band 9 is disposed on the second straight section of the core wire 6, as shown in fig. 1 and 2. Through the reducing design of the core wire 6, the support and the mechanical transmission efficiency of the conveying system can be enhanced.
Preferably, the stent delivery tube 8 is a variable diameter hypotube which comprises a distal portion, a sub-proximal portion and a proximal portion which are connected in sequence. In correspondence with the core wire 6, the distal portion of the variable diameter hypotube is clearance fitted with the first straight section of the core wire 6, and the proximal portion of the variable diameter hypotube is clearance fitted with the second straight section of the core wire 6. Furthermore, the secondary proximal portion of the tapered hypotube is tapered and longer than the tapered section of the core wire 6 for achieving a smooth transition of the distal and proximal portions and ensuring that the stent delivery tube 8 can be moved proximally to the appropriate position relative to the core wire 6 to complete the release of the stent 7.
In addition, in order to ensure that the proximal end of the variable-diameter hypotube has enhanced supporting force, the distal end portion of the variable-diameter hypotube has a cutting groove, and the sub-proximal end portion and the proximal end portion do not have a cutting groove. Meanwhile, in order to further enhance the support and mechanical transmission efficiency of the delivery system, the distance between adjacent cutting grooves of the distal part of the reducing hypotube is gradually increased from the distal end to the proximal end.
The delivery and release process of the stent 7 is described below. Before the surgery is started, the stent 7 is preloaded in the short microcatheter 5. The process of preloading involves crimping the stent 7 into a contracted state for loading into the short microcatheter 5 with the stent delivery tube 8, as shown in fig. 4a-4 c. After being loaded into the short microcatheter 5, the stent 7 is tightly crimped between the short microcatheter 5 and the stent delivery tube 8, and the stent 7 will remain in a contracted state under the constraint of the short microcatheter 5. After the pre-load is completed, the delivery system may be inserted into the vessel through an auxiliary device and delivered to the site; the preloaded delivery system may also be delivered to the site within the intermediate catheter, optionally after insertion of the intermediate catheter to the site. As shown in fig. 5a-5c, after reaching the vicinity of the affected part, the stent 7 is released, and at this time, the core wire 6 is pushed further to the far end, the position of the stent delivery tube 8 is kept approximately unchanged, so that the stent delivery tube 8 is pulled back relative to the core wire 6, which causes the stent 7 to be gradually exposed out of the short microcatheter 5 from the near end to the far end, so that the stent gradually expands radially from the near end to the far end to be in a fully expanded state, and then the release from the short microcatheter 5 and the stent delivery tube 8 is completed. After the stent 7 is in the fully expanded state, the core wire 6 and the stent delivery tube 8 are pulled back so that all portions except the stent 7 are withdrawn proximally. By pulling back the stent delivery tube 8 relative to the core wire 6, the stent 7 is released from the proximal end of the short microcatheter 5, changing the form that the former relative movement is the release of pushing the stent, reducing the delivery resistance and reducing the operation risk.
In this embodiment, the stent delivery system further includes a plurality of support tubes 4 that are provided around the stent delivery tube 8 at intervals in the extending direction of the stent delivery tube 8, so that the stent 7 is crimped between the plurality of support tubes 4 and the short microcatheter 5 when the stent 7 is delivered. The support tube 4 is preferably made of polymer, and when the stent 7 is pressed into the short micro-catheter 5, the support tube 4 moves the stent 7 by the friction force generated by pressing the stent 7, so as to facilitate the insertion and extraction process of the stent 7 relative to the short micro-catheter 5.
The embodiments of the present invention are not limited to the above-described examples, and various changes and modifications in form and detail may be made by those skilled in the art without departing from the spirit and scope of the present invention, and these are considered to fall within the scope of the present invention.
Claims (16)
1. A stent delivery system, comprising:
a seeker lumen for establishing a pathway in a blood vessel, comprising a flat tubular lumen section near a distal end and a tapered tubular lumen section near a proximal end;
a short microcatheter for receiving the stent; the distal end of the short microcatheter is fixedly connected with the proximal end of the cavity of the guide head;
a core wire for advancing the stent delivery system; the core wire is inserted into and penetrates through the cavity of the guide head and the short microcatheter and is fixedly connected with the cavity of the guide head and/or the short microcatheter;
a stent delivery tube sleeved on the core wire and adapted to slide along the core wire to insert and remove the short microcatheter; the far end of the bracket delivery pipe is provided with a bracket limiting part; and
a stent having a contracted state and a fully expanded state; the stent is suitable for being sleeved on the stent delivery tube, is squeezed between the short microcatheter and the stent delivery tube as the stent delivery tube is inserted into the short microcatheter and is in a contracted state under the restraint of the stent delivery tube; when the stent delivery tube is moved out of the short microcatheter, the stent is gradually exposed out of the short microcatheter from the proximal end to the distal end under the driving of the stent delivery tube, so that the stent gradually expands radially from the proximal end to the distal end to the fully expanded state.
2. The stent delivery system of claim 1, wherein the guide tip lumen is wound from a wire.
3. The stent delivery system of claim 1, wherein the straight tube lumen segment has a first diameter; the short microcatheter has a second diameter greater than the first diameter; the tapered lumen section gradually increases in diameter in a proximal direction from a first diameter to a second diameter.
4. The stent delivery system of claim 3, wherein the inner diameter of the straight tube lumen segment is greater than or equal to the diameter of the core wire and the inner surface of the straight tube lumen segment is fixedly attached to the core wire.
5. The stent delivery system according to claim 1, further comprising a connection ring, wherein the connection ring is sleeved on the core wire and is positioned at the connection position of the guide head lumen and the short microcatheter; the connecting ring is respectively and fixedly connected with the core wire, the cavity of the guide head and the short microcatheter.
6. The stent delivery system of claim 5, wherein the introducer lumen, the connecting ring, and the stent spacing component are all made of a material comprising a visualization material.
7. The stent delivery system of claim 1, wherein the proximal end of the core wire is provided with a marker band for indicating that the stent has been fully exposed outside the short microcatheter and is in a fully expanded state when the proximal end of the stent delivery tube is moved proximally relative to the core wire to the marker band.
8. The stent delivery system of claim 1, wherein the distal end of the core wire is flush with the distal end of the introducer lumen and is formed into a hemispherical nose by laser melting or soldering or spot gluing.
9. The stent delivery system of claim 8, wherein the nose has a diameter greater than or equal to an outer diameter of the distal end of the introducer lumen.
10. The stent delivery system of claim 1, wherein the core wire comprises, in order from a distal end to a proximal end, a first straight section, a tapered section, and a second straight section; the first straight section has a third diameter, the second straight section has a fourth diameter greater than the third diameter, and the tapered section gradually increases in diameter in a proximal direction from the third diameter to the fourth diameter.
11. The stent delivery system of claim 10, wherein the stent delivery tube is a variable diameter hypotube; the reducing hypotube comprises a distal part, a secondary proximal part and a proximal part which are sequentially connected; the distal portion is capable of clearance fitting with the first straight section of the core wire; the proximal portion is capable of clearance fitting with the second straight section of the core wire; the secondary proximal portion is tapered for achieving a smooth transition between the distal and proximal portions; the length of the second proximal portion is greater than the length of the tapered section of the core wire.
12. The stent delivery system of claim 11, wherein a distal portion of the variable diameter hypotube has cut slots and a sub-proximal portion and a proximal portion of the variable diameter hypotube do not have cut slots.
13. The stent delivery system of claim 11, wherein a spacing between adjacent cut slots of the distal portion of the variable diameter hypotube increases from the distal end to the proximal end.
14. The stent delivery system according to claim 1, further comprising a plurality of support tubes provided on the stent delivery tube at intervals along an extension direction of the stent delivery tube; the stent is crimped between the short microcatheter and the plurality of support tubes as the stent delivery tube is inserted into the short microcatheter.
15. The stent delivery system of claim 1, wherein the plurality of support tubes are polymeric tubes.
16. The stent delivery system of claim 1, wherein the core wire has an overall length of 1800 and 2200 mm; the length of the short micro-catheter is 50-150 mm; the length of the cavity section of the straight pipe is 5-150 mm; the length of the conical cavity section is 10-50 mm.
Priority Applications (1)
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|---|---|---|---|
| CN202111029161.XA CN113749834A (en) | 2021-09-02 | 2021-09-02 | Stent delivery system |
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| CN202111029161.XA CN113749834A (en) | 2021-09-02 | 2021-09-02 | Stent delivery system |
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| CN113749834A true CN113749834A (en) | 2021-12-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116212201A (en) * | 2023-02-17 | 2023-06-06 | 上海励楷科技有限公司 | Low-resistance conveying assembly and bracket conveying system |
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2021
- 2021-09-02 CN CN202111029161.XA patent/CN113749834A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116212201A (en) * | 2023-02-17 | 2023-06-06 | 上海励楷科技有限公司 | Low-resistance conveying assembly and bracket conveying system |
| CN116212201B (en) * | 2023-02-17 | 2024-04-12 | 上海励楷科技有限公司 | Low-resistance conveying assembly and bracket conveying system |
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