Bionic prostate stent

Abstract

The utility model relates to the technical field of medical instruments, in particular to a bionic prostate stent which comprises a supporting body supported in a prostate, the supporting body is of a close-packed spiral structure formed by winding metal wires with memory characteristics, and the cross section of the supporting body is of a triangle-like structure matched with an inner cavity of the prostate. The two ends of the supporting body in the length direction are a first end face and a second end face respectively, and the rotation angle between the second end face and the first end face is alpha. The prostate is distracted by simulating a human body prostate physiological anatomical structure and adopting the supporting body with the triangular-like section, the comfort level of a patient is improved, the supporting body makes contact with tissue more stably and is not prone to displacement, meanwhile, the supporting body of the close-packed spiral structure has high supporting force, in addition, the stress in the twisting state is small, and the supporting body is more stable. Therefore, the urethral mucosa can be prevented from being scratched by excessive stress.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a bionic prostate stent. Background Art

[0002] Benign prostatic hyperplasia (BPH) is the most common disease in older men, with its incidence increasing with age. It often causes a range of symptoms, including difficulty urinating, interrupted urination, and difficulty urinating. In severe cases, it can lead to urinary retention, which can lead to stones, hematuria, and even kidney damage over time. Currently, drug treatments for BPH are quite effective, and most patients achieve good results with medication. However, with age, drug effectiveness gradually decreases, necessitating further surgery. However, by this age, patients are generally advanced in age, have multiple underlying medical conditions, and surgical risks are high. Therefore, many patients opt for long-term indwelling catheterization, which severely impacts their quality of life.

[0003] Prostate stent is the latest treatment for benign prostatic hyperplasia. The stent uses nickel-titanium memory metal stent as the main material and is placed in the prostate part of the urethra. It uses elastic expansion force to stretch the urethra squeezed by prostate hyperplasia, open the urethra, and fix it in the prostate segment of the urethra through a fixing device. The operation has small trauma, fast recovery and good effect.

[0004] The cross-section of the stents in the prior art is generally circular, which does not completely match the shape of the prostate cavity, increasing the patient's discomfort. In addition, the stent is not easy to remove, and a large pulling force is required during the removal process, which can easily cause scratches to the urethral mucosa. Utility Model Content

[0005] The technical problem to be solved by the present invention is: in order to solve the problems that the cross-section of the stents in the prior art is roughly circular, which does not completely match the shape of the prostate cavity, increases the patient's discomfort, and the stents are not easy to remove. A large pulling force is required during the removal process, which easily causes scratches to the urethral mucosa. A bionic prostate stent is now provided.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: a bionic prostate stent, comprising a support body supported inside the prostate, wherein the support body is a closely packed spiral structure formed by winding a metal wire with memory properties, and the cross section of the support body is a triangular structure that matches the prostate cavity, wherein the triangular structure is formed by three arcs formed by the inward concavity of the three sides of the triangle, and the two ends of the support body along its length direction are a first end face and a second end face, respectively, and the rotation angle between the second end face and the first end face is α:

[0007] Furthermore, the rotation angle α between the second end face and the first end face is 30°±2°.

[0008] Furthermore, the cross-sectional area of ​​the support body gradually increases from the first end surface to the second end surface, and the first end surface is located at the front end of the prostate cavity.

[0009] Furthermore, the support also includes an anchor fixed to the front end of the sphincter, and a cross-sphincter winding is connected between the support body and the anchor.

[0010] Furthermore, the anchoring member is a closely packed spiral structure formed by winding metal wires and is conical in shape, and the small end of the anchoring member is opposite to the first end face of the supporting body.

[0011] Furthermore, circular arcs are used to transition between two adjacent arcs of the triangular structure.

[0012] Furthermore, the stent is electrochemically polished, and the exterior of the stent is coated with a corrosion-resistant coating, the material of the corrosion-resistant coating being e-PTFE.

[0013] The beneficial effects of the present invention are as follows: the present invention simulates the physiological and anatomical structure of the human prostate and adopts a support body with a triangular cross-section to expand the prostate, thereby improving the patient's comfort. The support body is in more stable contact with the tissue and is not easily displaced. At the same time, the support body with a dense spiral structure has a high supporting force. In addition, the stress in the twisted form is smaller, and it is easier to stretch into a filamentous shape, which can avoid excessive stress from scratching the urethral mucosa. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a schematic structural diagram of the utility model from the first perspective;

[0016] Figure 2 This is a structural diagram of the utility model from a second viewing angle;

[0017] Figure 3 It is a side view of the utility model;

[0018] Figure 4 It is the tensile force required to stretch the same distance at different rotation angles after cooling at 5°C.

[0019] Figure 5 This is a schematic diagram of the utility model after being placed in the prostate.

[0020] In the picture:

[0021] 1. Support body; 101. Arc line; 102. First end surface; 103. Second end surface;

[0022] 2. Anchor; 201, small end; 202, large end;

[0023] 3. Transsphincteric winding;

[0024] 4. Prostate;

[0025] 5. Sphincter. DETAILED DESCRIPTION

[0026] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that illustrate the basic structure of the present invention only in a schematic manner. Therefore, they only show components relevant to the present invention, and directions and references (e.g., up, down, left, right, etc.) may be used solely to facilitate the description of features in the drawings. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0027] like Figure 1-Figure 3 As shown, a bionic prostate stent includes a support body 1 supported within the prostate 4. The support body 1 is a close-packed spiral structure formed by winding a metal wire with memory properties using a winding process. The metal wire is a temperature-controlled nickel-titanium wire. The metal wire has a first form (i.e., the close-packed spiral structure) at a first temperature of approximately 37°C, which is close to human body temperature. The support body 1 placed in the prostate 4 can maintain a fixed structure and can open the prostate 4. Compared with the mesh structure in the prior art, it has a stronger support force and can open the bladder neck. The support body 1 has a second form at a second temperature of approximately 5°C. At this temperature, the stent softens and is easier to pull into a filament. When it needs to be removed, it can be softened by simply inserting 5°C physiological saline, and the filamentous stent can be withdrawn using a urethral forceps.

[0028] The cross-section of the support body 1 is a triangular structure that matches the inner cavity of the prostate 4. The triangular structure is formed by three arcs 101 formed by the inward concavity of the three sides of the triangle. After implantation, the three arcs 101 of the support body 1 are in contact with the prostate 4 tissue, and the intersection is wrapped by the hyperplastic prostate 4 tissue, eliminating the foreign body sensation and improving patient comfort. The support body 1 also has more stable contact with the tissue and is not easily displaced.

[0029] The two ends of the support body 1 along its length direction are respectively a first end face 102 and a second end face 103. The rotation angle between the second end face 103 and the first end face 102 is α, that is, the second end face 103 is formed by rotating the first end face 102 by a certain angle, so that the support body 1 is not a regular prismatic structure, and its overall shape is a twisted shape. The support body 1 of this structure has less stress, and it is easier to stretch into a filament and then exit the human body, which can avoid excessive stress from scratching the urethral mucosa.

[0030] This embodiment simulates the physiological and anatomical structure of the human prostate and adopts a support body 1 with a triangular cross-section to support the prostate 4, thereby improving the patient's comfort. The support body 1 is in more stable contact with the tissue and is not easily displaced. At the same time, the support body 1 with a dense spiral structure has a high supporting force. In addition, the stress in the twisted form is smaller and it is easier to stretch into a filament, which can avoid excessive stress from scratching the urethral mucosa.

[0031] In some examples, the rotation angle α between the second end surface 103 and the first end surface 102 is 30°±2°, Figure 4 It can be seen that when α is 30°, the minimum force required to stretch the same distance is 0.5N, and the support body 1 is easier to be pulled into a filamentous shape, which can avoid excessive stress causing scratches on the urethral mucosa when the support body 1 does not match the human body and needs to be pulled out.

[0032] In some examples, the cross-sectional area of ​​the support body 1 gradually increases from the first end surface 102 to the second end surface 103 , and the first end surface 102 is located at the front end of the inner cavity of the prostate 4 .

[0033] In some examples, such as Figure 1 and Figure 2 As shown, the stent also includes an anchor 2 fixed to the front end of the sphincter 5, and a cross-sphincter winding 3 is connected between the support body 1 and the anchor 2. The front end of the sphincter 5 can be fixed by the anchor 2, so that the stent is not easy to shift, the stability of the stent is improved, and the pain and increased medical costs caused by reoperation for reduction or removal due to displacement can be avoided. The linear structure of the cross-sphincter 5 winding 3 does not contact the sphincter 5, will not interfere with the activity of the sphincter 5, will not affect the closing function of the urethral sphincter 5, and will not cause urinary tract infection.

[0034] In some examples, the anchor 2 is a dense spiral structure formed by winding metal wire, and it is conical in shape, light in weight, and gradually close to the front end of the sphincter 5. The metal wire is also made of nickel-titanium wire. The small end of the anchor 2 is opposite to the first end face 102 of the support body 1, that is, the two ends of the entire bracket are the large end of the anchor 2 and the second end face 103 of the support body 1, respectively. The two cooperate with each other to position the entire bracket to prevent the bracket from moving forward or backward.

[0035] In some examples, arc transitions are used between two adjacent arcs 101 of the triangular structure to prevent damage to the prostate 4 tissue, and the curvature of this portion is smaller than the curvature of the arc 101 .

[0036] In some examples, due to the special urine corrosion environment of the urethra and the fact that the prostate lesions of many patients are in a state of continuous growth, tissue can easily enter the interior of the stent. Once the stent needs to be removed, surgical treatment is required, and it will cause tears in the prostate 4 and urethra. Therefore, the stent needs to be coated. Although the polymer membrane in the prior art can prevent the prostate 4 tissue from entering the interior of the stent, the polymer membrane is prone to calcification, crystallization, and corrosion, causing risks such as inflammation, hematuria, and bacterial infection. The support body 1 of the present application is electrochemically polished, and the outside of the support body 1 is coated with a corrosion-resistant coating. The material of the corrosion-resistant coating is e-PTFE. e-PTFE is also a relatively inert material with a low friction coefficient and non-adhesive properties, and has durability, degradation resistance and high biocompatibility. Its inertness can usually prevent cells from adhering to the prosthesis, and its microporous structure can prevent cell penetration and tissue growth. Therefore, the bionic prostate 4 stent can be implanted for a long time.

[0037] Working principle:

[0038] During stent placement, the patient is locally anesthetized and, under X-ray, a cystoscope is used to mark the length and degree of stenosis of the patient's prostate 4. The appropriate stent size is selected, and the support body 1 is placed on the patient's prostate 4. The transsphincteric winding 3 spans the sphincter 5, and the anchor 2 is placed at the front end of the sphincter 5. Figure 5 When removing the stent, place 5°C saline solution to soften it. Use a urethral clamp to grasp the front end of the anchor 2 and remove the filamentous stent. This application is particularly suitable for high-risk patients, as intraoperative and postoperative bleeding is minimal, and patients recover faster. Furthermore, the stent is easily removed without affecting other treatments, and most patients are able to urinate on their own after surgery.

[0039] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A bionic prostate stent, characterized by: The invention comprises a support body (1) supported inside a prostate (4), wherein the support body (1) is a closely packed spiral structure formed by winding a metal wire with memory properties, and the cross section of the support body (1) is a triangular structure matching the inner cavity of the prostate (4), wherein the triangular structure is formed by three arcs (101) formed by the three sides of the triangle being concave inward, and the two ends of the support body (1) along its length direction are a first end face (102) and a second end face (103), respectively, and the rotation angle between the second end face (103) and the first end face (102) is α.

2. The bionic prostate stent according to claim 1, characterized in that: The rotation angle α between the second end surface (103) and the first end surface (102) is 30°±2°.

3. The bionic prostate stent according to claim 1, characterized in that: The cross-sectional area of ​​the support body (1) gradually increases from the first end surface (102) to the second end surface (103), and the first end surface (102) is located at the front end of the inner cavity of the prostate (4).

4. The bionic prostate stent according to claim 3, characterized in that: The support further comprises an anchoring member (2) fixed at the front end of the sphincter (5), and a sphincter-splitting winding wire (3) is connected between the support body (1) and the anchoring member (2).

5. The bionic prostate stent according to claim 4, characterized in that: The anchoring member (2) is a dense spiral structure formed by winding metal wires and is conical in shape. The small end of the anchoring member (2) is opposite to the first end surface (102) of the supporting body (1).

6. The bionic prostate stent according to claim 1, characterized in that: Circular arcs are used to transition between two adjacent arcs (101) of the triangular structure.

7. The bionic prostate stent according to claim 1, characterized in that: The stent is electrochemically polished, and the exterior of the stent is coated with a corrosion-resistant coating made of e-PTFE.

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