Stent for treating benign prostatic hyperplasia and using method thereof
By adopting an isosceles triangle design with three parallel pillars and V-shaped rods in the prostate stent, the problem of uneven support and difficulty in retracting in the treatment of prostate hyperplasia is solved, and the effect of stable support and convenient retracting is achieved, reducing the risk of surgery.
Patent Information
- Application Number
- CN202510423312.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2025-07-29
AI Technical Summary
The existing prostate stents are difficult to evenly distribute stress when expanded, and are prone to local stress concentration. They may deform or displace during long-term use, and are difficult to retract, which increases the complexity and risk of surgical operations.
The V-shaped rod design is designed with three parallel pillars and three sets of spaced V-shaped rod tips facing the distal end, forming an isosceles triangle structure, providing strong support and fixing the position through the anchoring function, while facilitating retraction operation.
It improves the support effect of the stent, prevents displacement, reduces the difficulty of surgical operation, and improves surgical efficiency and safety.
Smart Images
Figure CN120381356A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of medical devices, and particularly relates to a stent for treating benign prostatic hyperplasia and a method for using the same. Background Art
[0002] The prostate is a fibromuscular and glandular organ located below the bladder. When the prostate enlarges, the gland compresses and squeezes the prostatic urethra. Benign prostatic hyperplasia is a common disease in middle-aged and elderly men, and its main symptoms include difficulty in urination, thinning of the urine stream, frequent urination, urgency, etc., which seriously affect the quality of life of patients. As a minimally invasive treatment method, prostate stents are widely used in clinical treatment.
[0003] Existing prostate stents mostly rely on point support and open grid structures to resist tissue pressure. This structure is difficult to evenly distribute stress during expansion, and local stress concentration is likely to occur. Moreover, during long-term use, the stent may deform or shift due to tissue pressure and changes in the shape of the prostatic cavity, resulting in poor support effect. In addition, existing prostate stents are difficult to retract after implantation, which brings great difficulties to the removal of the stent. Once the stent shifts or needs to be replaced, doctors often need to perform complex surgical operations, increasing the pain of patients and the surgical risk. Summary of the Invention
[0004] The purpose of the present invention is to provide a stent for treating benign prostatic hyperplasia with good support, not easily displaced and easy to retract.
[0005] Another purpose of the present invention is to provide a method for using the above-mentioned stent.
[0006] To achieve the above purpose, the technical solution adopted by the present invention is:
[0007] On the one hand, the present invention provides a stent for treating benign prostatic hyperplasia, the stent includes three parallelly arranged struts and three groups of connecting rod groups respectively arranged between every two struts. Each group of connecting rod groups has a plurality of V-shaped rods arranged at intervals. The tips of the V-shaped rods on the three groups of connecting rod groups all face the distal direction. When observing along the length direction of the struts, the projection of the stent is an isosceles triangle.
[0008] The present invention innovatively adopts the design of V-shaped rods and struts, significantly improving the performance of the prostate stent. On the one hand, the V-shaped rods not only provide strong support for the overall stent, effectively supporting the prostate and alleviating the problem of urethral compression caused by prostate hyperplasia, but also their tips have an anchoring function, firmly fixing the position of the stent and preventing it from displacing into the bladder, thus ensuring the stable functioning of the stent in the body. On the other hand, the structural design of the V-shaped rods and struts makes the retraction operation of the stent more convenient, greatly reducing the operation difficulty for doctors when replacing the stent and improving the surgical efficiency and safety.
[0009] Preferably, the tips of the V-shaped rods on the same connecting rod group are located on the center line between the two struts corresponding to the connecting rod group, and the shapes and sizes of the V-shaped rods on the same connecting rod group can be the same or different. Such a setting facilitates the stent to be shrunk to a smaller volume and is convenient for retraction.
[0010] Further preferably, the shapes and sizes of the V-shaped rods on the same connecting rod group are the same, and the shapes and sizes of the V-shaped rods on the two connecting rod groups located on the two side surfaces of the stent are the same.
[0011] In some embodiments, the V-shaped rods on the two connecting rod groups located on the two side surfaces of the stent are symmetrically arranged, so as to ensure the same support force in different regions on the two side surfaces of the stent.
[0012] Preferably, the number of V-shaped rods in each connecting rod group can be the same or different.
[0013] Further preferably, the number of V-shaped rods in each connecting rod group is independently 3 to 6, such as 3, 4, 5 or 6.
[0014] In some embodiments, the number of V-shaped rods on the two connecting rod groups located on the two side surfaces of the stent is the same and is 3 to 5.
[0015] In some embodiments, the number of V-shaped rods on the connecting rod group on the bottom side surface of the stent is the same and is 3 to 4.
[0016] Preferably, the width of the V-shaped rod is 0.1 mm to 0.5 mm.
[0017] Preferably, the thickness of the V-shaped rod is 0.1 mm to 0.5 mm.
[0018] Preferably, the V-shaped angle of the V-shaped rod is 30° to 90°.
[0019] In some embodiments, the V-shaped angle of the V-shaped rod on the bottom surface of the stent is 50° to 70°.
[0020] In some embodiments, the V-shaped angle of the V-shaped rod on the side surface of the stent is 50° to 70°.
[0021] Preferably, the stent further includes a recovery rod connected between the proximal ends of any two struts, the recovery rod is V-shaped and its tip faces the proximal direction.
[0022] More preferably, the tip of the recovery rod is located on the center line between the two struts corresponding to the recovery rod.
[0023] In some embodiments, there are two recovery rods, and the two recovery rods are located between two different struts.
[0024] Preferably, the base angle R1 of the isosceles triangle is 60° - 80°, and the apex angle R2 is 20° - 60°.
[0025] Preferably, the diameter D of the circumscribed circle of the isosceles triangle is 4 mm - 20 mm.
[0026] Preferably, the length of the strut is 15 mm - 50 mm.
[0027] Preferably, the width of the strut is 0.1 mm - 0.5 mm.
[0028] Preferably, the thickness of the strut is 0.1 mm - 0.5 mm.
[0029] Preferably, the material of the stent is nitinol alloy.
[0030] Preferably, the stent is made by laser engraving and heat setting processes.
[0031] The second aspect of the present invention is to provide an implantation system, including the stent as described above.
[0032] Preferably, the implantation system further includes a delivery device. The delivery device refers to the prior art and will not be specifically described.
[0033] The third aspect of the present invention is to provide a method for using the above stent, including advancing the stent to the prostatic urethra through the delivery device, embedding the tip of the V-shaped rod of the stent into the soft tissue of the prostatic urethra to prevent the stent from moving.
[0034] Preferably, the method of use further includes attaching the bottom end of the stent to the soft tissue of the prostatic urethra on the inner side of the middle lobe of the prostate, and attaching the two sides of the stent to the soft tissue of the prostatic urethra on the inner side of the lateral lobes of the prostate respectively.
[0035] Preferably, the method of use further includes clamping the recovery rod of the stent with forceps and pulling the stent in a direction away from the bladder to control the stent to retract into the delivery device.
[0036] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:
[0037] Through the design of the V-shaped rod and the strut, the present invention not only provides strong support for the overall stent, can effectively support the prostate, relieve the urethral compression problem caused by prostate hyperplasia, but also the tip of the V-shaped rod has an anchoring function, can firmly fix the position of the stent, prevent its displacement into the bladder, so as to ensure the stable function of the stent in the body; in addition, this design makes the retraction operation of the stent more convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings.
[0039] Figure 1 Structural schematic diagram of the prostate stent provided for Embodiment 1;
[0040] Figure 2 Structural schematic diagram of another angle of the prostate stent provided for Embodiment 1;
[0041] Figure 3 Side view of the prostate stent provided for Embodiment 1;
[0042] Figure 4 Structural schematic diagram of the V-shaped rod provided for Embodiment 1;
[0043] Wherein: 1, strut; 11, proximal end of the strut; 12, distal end of the strut; 2, V-shaped rod; 21, tip of the V-shaped rod; 22, first rod; 23, second rod; 3, recovery rod; 31, tip of the recovery rod;
[0044] x, center line; a, V-shaped angle; R1, base angle; R2, apex angle; D, diameter. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0045] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.
[0046] In the description of the embodiments of the present invention, it should be understood that the distal end refers to the end of the instrument or component that is far from the operator, and the proximal end refers to the end of the instrument or component that is close to the operator; the axial direction refers to the direction parallel to the center line connecting the distal end and the proximal end of the instrument or component; the inner and outer positions are defined by the distance relative to the center of the instrument or component, where the inner is the position close to the center of the instrument or component, and the outer is the position far from the center of the instrument or component. The description of the above orientation terms is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present invention.
[0047] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.
[0048] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include indirect contact between the first and second features through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.
[0049] The following disclosure provides many different embodiments or examples for implementing different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the embodiments of the present invention. In addition, the embodiments of the present invention may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.
[0050] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0051] Embodiment 1
[0052] A prostate stent, such as Figures 1 to 3As shown, it includes three parallel pillars 1 and three groups of connecting rods arranged one by one between every two pillars 1. When viewed along the length direction of the pillars 1, the projection of the bracket is an isosceles triangle ( Figure 3 The isosceles triangle structure can better fit the prostatic urethra. Preferably, the base angle R1 of the isosceles triangle is 60° to 80°, and the vertex angle R2 is 20° to 60°. The diameter D of the circumscribed circle of the isosceles triangle is preferably 4mm to 20mm, thereby better fitting the prostatic urethra and providing support for the prostate.
[0053] Taking one of the connecting rod groups as an example, the connecting rod group includes a plurality of V-shaped rods 2 arranged at intervals. The V-shaped rods 2 can provide strong support for the stent as a whole and effectively support the prostate. At the same time, the tip 21 of the V-shaped rod can be embedded in the soft tissue of the prostatic urethra to prevent the stent from moving. In addition, through the cooperation between the V-shaped rods 2 and the pillars 1, the stent can be folded toward the center under force, thereby facilitating the retraction of the stent. Preferably, the tips of the V-shaped rods 2 on the three groups of connecting rod groups are all facing the distal direction, which can not only enable the V-shaped rods 2 to be firmly embedded in the soft tissue when in use, but also help reduce scratches on the soft tissue when the stent is withdrawn.
[0054] Furthermore, the tip of the V-shaped rod 2 on the same connecting rod group is located on the center line x between the two pillars 1 corresponding to the connecting rod group, so that when the bracket is retracted, all the V-shaped rods 2 on the same connecting rod group can be folded in the direction of the center line x, which is beneficial for the bracket to shrink to a smaller volume and facilitate retraction. The shapes and sizes of the V-shaped rods 2 on the same connecting rod group are the same or different. Preferably, the shapes and sizes of the V-shaped rods 2 on the same connecting rod group are the same, and the shapes and sizes of the V-shaped rods 2 on the two groups of connecting rod groups on the two sides are the same, thereby ensuring that the supporting force of different areas of the bracket is consistent. Specifically, as Figure 4 As shown, the V-shaped rod 2 includes a first rod 22 and a second rod 23. The first rod 22 and the second rod 23 are of equal length and size, and one end of the first rod 22 and the second rod 23 are connected to form a V-shaped structure. The width of the first rod 22 and the second rod 23 are preferably 0.1mm to 0.5mm, and the thickness is 0.1mm to 0.5mm. The angle a formed by the first rod 22 and the second rod 23 is 30° to 90°.
[0055] There are 3 to 6 V-shaped rods 2 on each set of connecting rod groups, which are arranged at equal intervals. The number of V-shaped rods 2 in different connecting rod groups can be the same or different. In this embodiment, the connecting rod groups on both sides of the bracket have 4 V-shaped rods 2 and are symmetrically arranged, and the connecting rod group on the bottom surface has 3 V-shaped rods 2. The V-shaped rod 2 at the farthest end on the connecting rod group is connected to the distal end 12 of the corresponding support column, and the V-shaped rod 2 at the nearest end is connected to the proximal end 11 of the corresponding support column. The V-shaped angle A of the V-shaped rod 2 on the bottom surface of the bracket is preferably 50° to 70°, and the V-shaped angle A of the V-shaped rod 2 on the side surface of the bracket is preferably 50° to 70°.
[0056] The three support columns 1 are of the same size and length, with a length of 15 mm to 50 mm, a width of 0.1 mm to 0.5 mm, and a thickness of 0.1 mm to 0.5 mm.
[0057] For the convenience of stent retrieval, the stent further includes a retrieval rod 3 connected between the proximal ends of any two support columns 1. The retrieval rod 3 is V-shaped and the tip 31 of the retrieval rod faces the proximal direction. Further, the tip of the retrieval rod 3 is located on the center line x between the two support columns 1 corresponding to the retrieval rod 3. There are two retrieval rods 3, and the two retrieval rods 3 are located between different two support columns 1, and their width and thickness refer to the V-shaped rod 2. When retrieving the stent, use a foreign body forceps to clamp the two retrieval rods 3, and the stent can be retrieved through the retrieval sheath.
[0058] The material of the above stent is nitinol alloy and can be made by laser engraving and heat setting processes.
[0059] Working principle:
[0060] When in use, the stent is advanced to the prostatic urethra through a delivery device, and the position of the stent is adjusted so that its bottom end fits the soft tissue of the prostatic urethra on the inner side of the middle lobe of the prostate, and both sides fit the soft tissue of the prostatic urethra on the inner side of the lateral lobe of the prostate respectively, and the tip 21 of the V-shaped rod of the stent is embedded in the soft tissue of the prostatic urethra to prevent the stent from moving.
[0061] When replacing, use a clamp to clamp the retrieval rod 3 of the stent and pull the stent away from the bladder to control the stent to retract into the delivery device.
[0062] The above embodiments are only for illustrating the technical concept and characteristics of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims
1. A stent for treating benign prostatic hyperplasia, characterized in that, The stent includes three parallel struts (1) and three sets of connecting rod groups respectively arranged between every two struts (1). Each set of connecting rod groups has a plurality of V-shaped rods (2) arranged at intervals. The tips of the V-shaped rods (2) on the three sets of connecting rod groups all face the distal direction. When observing along the length direction of the struts (1), the projection of the stent is an isosceles triangle.
2. The stent for treating benign prostatic hyperplasia according to claim 1, wherein The tips of the V-shaped rods (2) on the same set of connecting rod groups are located on the center line (x) between the two struts (1) corresponding to this set of connecting rod groups. The shapes and sizes of the V-shaped rods (2) on the same set of connecting rod groups are the same or different.
3. The stent for treating benign prostatic hyperplasia according to claim 2, wherein The shapes and sizes of the V-shaped rods (2) on the same set of connecting rod groups are the same. The V-shaped rods (2) on the two sets of connecting rod groups located on both sides of the stent are symmetrically arranged.
4. The stent for treating benign prostatic hyperplasia according to any one of claims 1 to 3, characterized in that, The number of V-shaped rods (2) in each set of connecting rod groups is the same or different. The number of V-shaped rods (2) in each set of connecting rod groups is independently 3 to 6 respectively; and / or, The width of the V-shaped rod (2) is 0.1 mm to 0.5 mm, and the thickness is 0.1 mm to 0.5 mm; and / or, The V-shaped angle (a) of the V-shaped rod (2) is 30° to 90°.
5. The stent for treating benign prostatic hyperplasia according to claim 1, characterized in that, The stent further includes a recovery rod (3) connected between the proximal ends of any two struts (1). The recovery rod (3) is V-shaped and its tip faces the proximal direction.
6. The stent for treating benign prostatic hyperplasia according to claim 5, characterized in that, The tip of the recovery rod (3) is located on the center line (x) between the two struts (1) corresponding to this recovery rod (3); and / or, There are two recovery rods (3), and the two recovery rods (3) are located between different two struts (1).
7. The stent for treating benign prostatic hyperplasia according to claim 1, wherein The base angle (R1) of the isosceles triangle is 60° to 80°, and the apex angle (R2) is 20° to 60°; and / or, The diameter (D) of the circumcircle of the isosceles triangle is 4 mm to 20 mm.
8. The stent for treating benign prostatic hyperplasia according to claim 1, characterized in that, The length of the strut (1) is 15 mm to 50 mm, the width is 0.1 mm to 0.5 mm, and the thickness is 0.1 mm to 0.5 mm.
9. The stent for treating benign prostatic hyperplasia according to claim 1, characterized in that, The material of the stent is nitinol alloy; and / or, The stent is made by laser engraving and heat setting processes.
10. The method of using the stent according to any one of claims 1 to 9, characterized in that, The usage method includes advancing the stent to the prostatic urethra through a delivery device, embedding the tips of the V-shaped rods (2) of the stent into the soft tissue of the prostatic urethra to prevent the stent from moving.
11. The method of using the stent according to claim 10, characterized in that, The usage method further includes fitting the bottom end of the stent to the soft tissue of the prostatic urethra on the inner side of the middle lobe of the prostate, and fitting the two sides of the stent to the soft tissue of the prostatic urethra on the inner side of the lateral lobes of the prostate respectively.
12. The method of using the bracket according to claim 10, characterized in that, The usage method further includes clamping the recovery rod (3) of the stent with forceps and pulling the stent in the direction away from the bladder to control the stent to retract into the delivery device.