Stent releasing device capable of recycling stent
By designing a retrievable stent release device, and utilizing the sliding control of the outer tube, middle tube, and handle, the problem of improper stent release position is solved, achieving precise release and retrieval of the stent and avoiding stent damage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2026-03-17
AI Technical Summary
When existing stent release devices are used in non-vascular lumen areas of the human body, human factors and the axial retraction characteristics of the stent can easily lead to improper release positions. Existing retrieval methods may damage the stent or fail to release it completely.
A stent release device for a retrievable stent was designed, comprising an outer tube, a middle tube, and an inner tube. The relative sliding of the outer tube and the middle tube is controlled by a handle to achieve adjustable release and retrieval of the stent. The release status is observed using a visible ring to ensure accurate stent positioning.
It enables precise release and retrieval of the stent, avoiding stent damage and improving operational flexibility and accuracy.
Smart Images
Figure CN223995017U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical devices, and in particular to a stent release device for a retrievable stent. Background Technology
[0002] Nonvascular stents are medical devices used to expand and support nonvascular lumens, including esophageal stents, urethral stents, biliary stents, airway stents, and colonic stents. They are widely used in the esophagus, intestines, bile duct, trachea, urethra, and other sites to treat diseases of the respiratory, digestive, and urinary systems. They are used to treat luminal stenosis caused by benign or malignant factors or to reconstruct the structure and function of lumines.
[0003] During the placement of non-vascular stent systems into non-vascular lumens in the human body, the accuracy of stent placement is crucial. However, due to human error and the axial retraction characteristics of the stent itself, situations frequently arise during stent placement (when the stent is not fully deployed), where the placement is found to be inappropriate, requiring stent retrieval and adjustment. Current stent retrieval methods typically involve clamping the proximal end of the stent with grippers for adjustment. This method is prone to causing the grippers to become stuck at the proximal end of the stent, leading to the inability to deploy the stent and potentially damaging the proximal end. Utility Model Content
[0004] This invention provides a stent release device for a recyclable stent to solve at least one of the above-mentioned problems.
[0005] According to one aspect of the present invention, a recyclable support release device is provided, comprising an outer tube, a middle tube, and an inner tube sequentially arranged from the outside to the inside, a first handle connected to the outer tube, and a second handle connected to the middle tube; the inner tube has a guide head at its front end, the guide head being located at the front end of the outer tube, and the outer diameter of the guide head being larger than the inner diameter of the outer tube; the middle tube is slidably connected to the outer tube, and the middle tube has an annular fixing block at its front end, the outer diameter of the fixing block being larger than the outer diameter of the middle tube and smaller than the inner diameter of the outer tube; the front end of the support is sleeved between the outer tube and the inner tube, and the rear end of the support is sleeved between the fixing block and the outer tube.
[0006] This utility model discloses a recyclable stent release device. When the stent delivery tube is inserted into the designated position within the body cavity, keeping the second handle stationary, the locking button on the first handle is released, and the first handle is pulled backward, bringing it closer to the second handle. The first handle moves the outer tube backward, gradually releasing and opening the front end of the stent. If the stent is not fully released at the rear end, and the release position is not ideal, the release position needs adjustment. While keeping the second handle stationary, the first handle can be moved away from it, causing the second handle to move the front end of the outer tube towards the front end of the stent, gradually retracting the stent's front end completely into the outer tube. At this point, the locking button on the first handle is tightened, and the front end of the stent release tube is adjusted to the appropriate release position. The locking button on the first handle is then released, and the previous operation is repeated. Pulling the first handle backward, bringing it closer to the second handle, causes the first handle to move the outer tube backward, gradually releasing and opening the stent's front end until the front end of the outer tube is completely detached from the rear end of the stent, and the stent is fully released. Finally, tighten the locking button on the first handle and pull the second handle to remove the entire support release device from the human body cavity.
[0007] In some embodiments, a visible / hidden ring is provided on the outer side of the front end of the central tube of this invention.
[0008] In some embodiments, the first handle of this invention is provided with a fixing button for fixing the position of the first handle relative to the middle tube.
[0009] In some embodiments, the first handle of this invention is a hollow tube, with the middle tube and inner tube passing through the first handle.
[0010] In some embodiments, the first handle of this utility model is provided with a hollow external threaded rod and a nut adapted to the external threaded rod; the rear end of the outer tube is flared and is sleeved on the external threaded rod. By tightening the nut, the outer tube is fixedly connected to the first handle.
[0011] In some embodiments, the present invention also includes a tail shank connected to the inner tube; the middle tube is slidably connected to the inner tube.
[0012] In some embodiments, the second handle of this invention is a hollow tube with an inner tube passing through it.
[0013] In some embodiments, a booster tube is sleeved between the inner tube and the middle tube of this invention.
[0014] In some embodiments, the booster tube of this invention is made of stainless steel.
[0015] In some embodiments, the rear end of the second handle of this invention is provided with a receiving groove for accommodating the tailstock. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of the support release device of the recyclable support according to one embodiment of the present invention;
[0017] Figure 2 for Figure 1 The diagram shows the structure of the stent release device for the recyclable stent during the stent release process.
[0018] Figure 3 for Figure 1 An enlarged view of point A shown in the diagram;
[0019] Figure 4 for Figure 2 An enlarged view of point B shown in the diagram;
[0020] Figure 5 This is a schematic diagram of the structure of the support release device of the recyclable support according to another embodiment of the present invention;
[0021] Figure 6 for Figure 5 The diagram shows the structure of the stent release device for the recyclable stent during the stent release process.
[0022] Figure 7 for Figure 5 An enlarged schematic diagram of point C is shown below;
[0023] Figure 8 for Figure 6 The enlarged schematic diagram at point D is shown. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.
[0026] Finally, it should be noted that in this document, relational terms such as first and second, counterclockwise and clockwise, forward and reverse are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising" or "including" include not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0027] The present invention will now be described in further detail with reference to the accompanying drawings.
[0028] Figure 1 and Figure 3 The structure of a stent release device for a recyclable stent according to one embodiment of the present invention is shown schematically.
[0029] refer to Figure 1 and Figure 3 As shown, the stent release device of the recyclable stent includes a stent delivery tube and an operating handle. The stent delivery tube includes an outer tube 11, a middle tube 12, and an inner tube 13. The operating handle includes a first handle 21 and a second handle 22.
[0030] The outer tube 11, the middle tube 12, and the inner tube 13 are sequentially fitted from the outside to the inside. The outer tube 11 is connected to the first handle 21, which is a hollow tube. The middle tube 12 and the inner tube 13 pass through the first handle 21. The middle tube 12 is connected to the second handle 22.
[0031] The inner tube 13 is provided with a guide head 30 at its front end. The guide head 30 is located at the front end of the outer tube 11, and the outer diameter of the guide head 30 is larger than the inner diameter of the outer tube 11.
[0032] The middle tube 12 is slidably connected to the outer tube 11. An annular fixing block 14 is provided at the front end of the middle tube 12. The outer diameter of the fixing block 14 is larger than the outer diameter of the middle tube 12 but smaller than the inner diameter of the outer tube 11. The length of the fixing block 14 can be 6-10 mm. This ensures that the fixing block 14 is firmly pressed against the rear end of the bracket 10, and also prevents excessive friction between the fixing block 14 and the interior of the outer tube 11, thus avoiding hindering the relative sliding of the outer tube 11 and the middle tube 12.
[0033] The front end of the bracket 10 is fitted between the outer tube 11 and the inner tube 13, and the rear end of the bracket 10 is fitted between the fixing block 14 and the outer tube 11.
[0034] A concealed ring 15 is provided on the outer front end of the central tube 12. The concealed ring 16 facilitates the doctor's observation of whether the stent 10 is close to or fully released.
[0035] The first handle 21 is provided with a fixing button 211 for fixing the position of the first handle 21 relative to the middle tube 12.
[0036] Figure 2 and Figure 4 schematically shown Figure 1 The structure of the stent release device for the recyclable stent shown is illustrated during the stent release process. (Reference) Figure 2 and Figure 4 As shown, when the stent delivery tube is inserted into the designated position within the body cavity, keep the second handle 22 stationary, release the fixing button 211 on the first handle 21, and pull the first handle 21 backward, bringing it closer to the second handle 22. The first handle 21 moves the outer tube 11 backward, gradually releasing and opening the front end of the stent 10. If the operator finds that the stent 10 is not fully released before the rear end of the stent 10 is completely released, the release position of the stent 10 needs to be adjusted. Keeping the second handle 22 stationary, the first handle 21 can be moved away from the second handle 22. The second handle 22 moves the front end of the outer tube 11 towards the front end of the stent 10, gradually and completely retracting the front end of the stent 10 into the outer tube 11. At this point, tighten the fixing button 211 on the first handle 21, adjust the front end of the stent release tube to the appropriate stent release position again, loosen the fixing button 211 on the first handle 21, and repeat the previous operation. Pull the first handle 21 backward so that the first handle 21 moves towards the second handle 22. The first handle 21 drives the outer tube 11 to move backward, and the front end of the stent 10 gradually releases and opens until the front end of the outer tube 11 is completely separated from the rear end of the stent 10, and the stent 10 is released into place. Finally, tighten the fixing button 211 on the first handle 21 and pull the second handle 22 to withdraw the entire stent release tube from the human body cavity.
[0037] Figure 5 and Figure 7 The structure of a stent release device for a recyclable stent according to another embodiment of the present invention is shown schematically.
[0038] refer to Figure 5 and Figure 7 As shown, the stent release device of the recyclable stent includes a stent delivery tube and an operating handle. The stent delivery tube includes an outer tube 11, a middle tube 12, and an inner tube 13. The operating handle includes a first handle 21 and a second handle 22.
[0039] The outer tube 11, the middle tube 12, and the inner tube 13 are sequentially fitted from the outside to the inside. The outer tube 11 is connected to the first handle 21, which is a hollow tube. The middle tube 12 and the inner tube 13 pass through the first handle 21. The middle tube 12 is connected to the second handle 22.
[0040] The inner tube 13 is provided with a guide head 30 at its front end. The guide head 30 is located at the front end of the outer tube 11, and the outer diameter of the guide head 30 is larger than the inner diameter of the outer tube 11.
[0041] The middle tube 12 is slidably connected to the outer tube 11. An annular fixing block 14 is provided at the front end of the middle tube 12. The outer diameter of the fixing block 14 is larger than the outer diameter of the middle tube 12 and smaller than the inner diameter of the outer tube 11. The length of the fixing block 14 can be 6-10 mm.
[0042] The front end of the bracket 10 is fitted between the outer tube 11 and the inner tube 13, and the rear end of the bracket 10 is fitted between the fixing block 14 and the outer tube 11.
[0043] A concealed ring 15 is provided on the outer front end of the central tube 12. The concealed ring 16 facilitates the doctor's observation of whether the stent 10 is close to or fully released.
[0044] The first handle 21 is provided with a fixing button 211 for fixing the position of the first handle 21 relative to the middle tube 12.
[0045] The recyclable support release device also includes a tail handle 23, which is connected to the inner tube 13, and the inner tube 13 is slidably connected to the middle tube 12. The interior of the second handle 22 is hollow tubular, and the inner tube 13 passes through the interior of the second handle 22.
[0046] A booster tube 16 is sleeved between the inner tube 13 and the middle tube 12, which facilitates smoother relative sliding between them. In this embodiment, the booster tube 16 is made of stainless steel, which also increases the strength of the support release tube. In other embodiments, polymer materials such as PE, PP, and PEEK can also be used.
[0047] Figure 6 schematically shown Figure 5 The structure of the stent release device of the recyclable stent shown in the stent release process.
[0048] refer to Figure 6As shown, when the stent delivery tube is inserted into the designated position within the body cavity, keep the second handle 22 stationary, release the fixing button 211 on the first handle 21, and pull the first handle 21 backward, bringing it closer to the second handle 22. The first handle 21 moves the outer tube 11 backward, gradually releasing and opening the front end of the stent 10. If the stent 10 is not fully released before its rear end is completely released, and the release position is not ideal, it needs to be adjusted. Keeping the second handle 22 stationary, the first handle 21 can be moved away from the second handle 22. The second handle 22 moves the front end of the outer tube 11 towards the front end of the stent 10, gradually retracting the front end of the stent 10 completely into the outer tube 11. At this point, tighten the fixing button 211 on the first handle 21, adjust the front end of the stent release tube to the appropriate stent release position again, loosen the fixing button 211 on the first handle 21, and repeat the previous operation. Pull the first handle 21 backward so that the first handle 21 moves towards the second handle 22. The first handle 21 drives the outer tube 11 to move backward, and the front end of the stent 10 gradually releases and opens until the front end of the outer tube 11 is completely separated from the rear end of the stent 10, and the stent 10 is released into place. Finally, tighten the fixing button 211 on the first handle 21 and pull the second handle 22 to withdraw the entire stent release device from the human body cavity.
[0049] While pulling the first handle backward, the tail handle 23 is also pulled backward, moving it away from the second handle 22. The tail handle 23 drives the inner tube 13 and the guide head 30 backward. As the bracket 10 is released, the guide head 30, pulled by the inner tube 13, also gradually moves backward, remaining inside the bracket 10 and gradually moving towards its rear end. When the front end of the outer tube 11 gradually moves to the rear end of the bracket 10 until the bracket 10 is completely released, the guide head 30 also disengages from the rear end of the bracket 10, smoothly retracting and avoiding the risk of the guide head being unable to retract due to compression of the bracket 10. When moving the first handle 21 away from the second handle 22 to retract the bracket 10, the tail handle 23 should also be moved towards the second handle 22 simultaneously, so that the guide head 30 can be located at the front end of the bracket 10 when it is fully retracted.
[0050] Figure 8 The diagram schematically illustrates the connection structure between the outer tube and the first handle of a bracket release device that facilitates effective retraction of the guide head, according to one embodiment of the present invention.
[0051] refer to Figure 8As shown, the rear end of the outer tube 11 is flared. The first handle 21 is provided with a hollow external thread rod 213 and a nut 212 that is adapted to the external thread rod 213. The rear end of the outer tube 11 is sleeved on the external thread rod 213. Tightening the nut 212 can fix the outer tube 11 to the first handle 21.
[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A stent release device for a retrievable stent, characterized by The outer tube, the middle tube and the inner tube are sequentially sleeved from outside to inside, the first handle is connected with the outer tube, and the second handle is connected with the middle tube; The front end of the inner tube is provided with a guide head, the guide head is located at the front end of the outer tube, and the outer diameter of the guide head is greater than the inner diameter of the outer tube; The middle tube is in sliding connection with the outer tube, the front end of the middle tube is provided with an annular fixing block, the outer diameter of the fixing block is greater than the outer diameter of the middle tube and less than the inner diameter of the outer tube; The front end of the support is sleeved between the outer tube and the inner tube, and the rear end of the support is sleeved between the fixing block and the outer tube.
2. The retrievable stent releasing device of claim 1, wherein, The front end of the middle tube is provided with a visible and invisible ring outside.
3. The recoverable stent releasing device of claim 1, wherein, The first handle is provided with a fixing button for fixing the position of the first handle relative to the middle tube.
4. The recoverable stent releasing device of claim 1, wherein, The first handle is a hollow tube, and the middle tube and the inner tube pass through the first handle.
5. The recoverable stent releasing device of claim 1, wherein, A hollow external thread rod is arranged in the first handle, and a nut matched with the external thread rod is arranged in the first handle, the rear end of the outer tube is in a trumpet shape, the rear end of the outer tube is sleeved on the external thread rod, and the outer tube is fixedly connected with the first handle by screwing the nut.
6. The recoverable stent releasing device of claim 1, wherein, The tail handle is connected with the inner tube. The middle tube is in sliding connection with the inner tube.
7. The recoverable stent releasing device of claim 6, wherein, The second handle is a hollow tube, and the inner tube passes through the second handle.
8. The recoverable stent releasing device of claim 6, wherein, The boost tube is sleeved between the inner tube and the middle tube.
9. The recoverable stent releasing device of claim 8, wherein, The boost tube is made of stainless steel.
10. Recuperable stent releasing device according to any of claims 6-9, characterized in that, The rear end of the second handle is provided with a containing groove for containing the tail handle.