3D-printed composite structured artificial anus

Abstract

The utility model discloses a kind of artificial anus of 3D printing composite structure formula, comprising: 1) lattice net structure formula outer wing, it replaces anal levator muscle, and is attached to pelvic floor, is placed in bony pelvic medial side;2) lattice net structure formula inner tube, replace original cancerous intestinal tube and proximal intestinal tube anastomosis, for realizing excrement transmission function;3) compressed telescopic tube, upper lattice net structure formula inner tube, when intestinal tract reaches certain pressure, it pops out;4) spiral thread pipe mouth and pressure sensor bottle cap, there are three spiral thread paths at spiral thread pipe mouth can make pipe mouth and bottle cap closely attached, pressure sensor is placed inside bottle cap and is connected with mobile phone APP by bluetooth.The utility model can realize reliable adhesion of outer wing and abdominal wall, inner tube and intestinal tube, prevent patient from falling off in normal life process after implantation, surgical implantation mode is simple and reliable, solve the existing nursing difficulty of bag type artificial anus, many wound complications, poor appearance and patient psychological damage and other problems.

Description

Technical Field

[0001] This utility model relates to a 3D-printed composite structure artificial anus, and relates to the field of medical devices. Background Technology

[0002] An enterostomy, or colostomy, is a surgical procedure that interrupts the continuity of the intestines, connecting the ileum or colon to an opening in the abdominal wall to divert fecal matter. The feces discharged through the enterostomy are collected in a stoma bag attached to the opening. Enterostomies are widely used in various bowel resections due to trauma or disease, such as inflammatory bowel disease or colorectal tumors. Enterostomies can be divided into temporary and permanent types. Temporary enterostomies are mostly used for radical tumor resections that preserve the anus, and are generally reduced three months post-surgery to restore the original continuity of the intestines. Permanent enterostomies are mostly used for radical tumor resections where the anus cannot be preserved. These patients will require a permanent enterostomy for life. It is estimated that approximately 100,000 new patients with permanent enterostomies are added annually in my country, with a cumulative total of about 1 million patients. The significant role of enterostomies in helping patients overcome difficulties is undeniable. However, the current combination of enterostomy and stoma bags causes numerous problems for patients' lives. Besides physiological issues such as the risk of complications like parastomal hernias and difficulties in self-care, patients also face considerable psychological distress, including the odor of the stoma bag, social avoidance due to leakage, and the embarrassment of losing their original anus. To address these inconveniences of existing stoma models, many novel artificial anuses have been developed, such as electronic artificial anuses (CN 103815987 A), conical artificial anuses (CN 214511419 U), and orthotopic implantable artificial anuses (CN 115192247 A). However, these all suffer from complex maintenance, cumbersome usage procedures, lack of reliability, and high surgical implantation risks, making their clinical application difficult. Utility Model Content

[0003] In order to address the shortcomings of existing hanging bag-type artificial anus, as well as the psychological difficulties such as social embarrassment and physiological difficulties such as nursing difficulties and wound complications caused by them, the purpose of this utility model is to provide a 3D printed composite structure artificial anus.

[0004] The technical solution for achieving the technical objective of this utility model is as follows:

[0005] A 3D-printed composite artificial anus includes:

[0006] 1) A lattice-like structure outer wing, which replaces the levator ani muscle, fits against the pelvic floor, and is placed on the inner side of the bony pelvis;

[0007] 2) A lattice-like inner tube replaces the original cancerous intestinal tube and anastomoses with the proximal intestinal tube to achieve the function of fecal transport;

[0008] 3) A pressure-bearing telescopic tube, connected to a lattice-mesh structured inner tube, which pops out when the intestinal tract reaches a certain pressure;

[0009] 4) Spiral grooved nozzle and pressure sensor cap: There are three spiral grooves at the nozzle to ensure a tight fit between the nozzle and the cap. The pressure sensor is placed inside the cap and connects to a mobile app via Bluetooth.

[0010] The lattice-mesh structured outer wing, lattice-mesh structured inner tube, pressure-bearing telescopic tube, and spiral-patterned tube opening are the main body of the anus, while the pressure sensor bottle cap is a separate, reusable assembly / disassembly accessory.

[0011] Both the outer wing with its lattice structure and the inner tube with its crystal network structure have a three-dimensional crystal lattice structure.

[0012] The pressure-retractable tube is normally in a contracted state inside the anus, but it will pop out when the intestinal pressure is greater than 100 mmHg to remind the patient to defecate.

[0013] The beneficial effects of this utility model are:

[0014] 1. A lattice network structure is attached to the inner tube and outer wings of the artificial anus using 3D printing technology. This structure facilitates cell ingrowth, thereby promoting a firm bond between the tissue and the artificial anus implant. On the other hand, the parts of the implant without the attached lattice network structure do not adhere to the tissue, achieving selective adhesion between the artificial anus implant and the organ, effectively fixing the artificial anus.

[0015] 2. The pressure-sensitive telescopic tube and pressure sensor cap can sense changes in intestinal pressure to prompt the patient to defecate.

[0016] 3. The spiral-patterned outer opening can be firmly connected to the outer opening, greatly reducing the possibility of odor and fecal leakage, and enabling patients to control their bowel movements.

[0017] 4. The 3D-printed integrated artificial anus of this utility model can be customized to adapt to the patient's anatomical structure by combining preoperative digital image reconstruction.

[0018] 5. The integrated artificial anus structure of this utility model is simple and practical, the surgical implantation operation is simple, and it is convenient for patients to use. Attached Figure Description

[0019] Figure 1 This is a top view (top view) of the artificial anus.

[0020] Figure 2 This is a frontal view of an artificial anus.

[0021] Figure 3 This is a bottom view (view from below) of the artificial anus.

[0022] Figure 4 It's the cap for an artificial anus. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings.

[0024] Preoperative CT scans are used to determine the shape and size of the intestines and pelvis, and a three-dimensional model of the artificial anus (human anus) is designed. The structure is adjusted according to the specific shape of the organs and tissues to meet the surgical requirements of patients with different body types. Finally, commercial polyurethane acrylate resin is used as the raw material for photopolymerization 3D printing to obtain the final product. The integrated molding of the main body greatly reduces the cumbersome assembly process, and a pressure sensor can be placed in the middle of the outer cover. Example

[0025] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a 3D-printed composite artificial anus includes:

[0026] 1) A lattice-like structure outer wing, which replaces the levator ani muscle, fits against the pelvic floor, and is placed on the inner side of the bony pelvis;

[0027] 2) A lattice-like inner tube replaces the original cancerous intestinal tube and anastomoses with the proximal intestinal tube to achieve the function of fecal transport;

[0028] 3) A pressure-sensitive telescopic tube, connected to a lattice-mesh inner tube, pops out when the intestinal pressure reaches a certain level. After defecation, the patient can insert this telescopic tube back into the anus for repeated internal circulation.

[0029] 4) The spiral-patterned tube opening and pressure sensor cap have three spiral patterns at the tube opening to ensure a tight fit between the tube opening and the cap. When needed, the patient can unscrew the cap to defecate. The pressure sensor is placed inside the cap and connects to a mobile app via Bluetooth. The app can inform the patient of intestinal pressure on their phone and remind them to defecate when the intestinal pressure reaches its peak.

[0030] The lattice-mesh structured outer wing, lattice-mesh structured inner tube, pressure-bearing telescopic tube, and spiral-patterned tube opening are the main body of the anus, while the pressure sensor bottle cap is a separate, reusable assembly / disassembly accessory.

[0031] The outer wing with its lattice structure and the inner tube with its lattice network structure both have a three-dimensional lattice structure. After implantation, this lattice structure facilitates cell ingrowth into the lattice gaps, enabling reliable adhesion between the outer wing and the abdominal wall, and between the inner tube and the intestinal tract. This prevents the implant from falling off during normal daily life. The surgical implantation method is simple and reliable, solving the problems of nursing difficulties, numerous wound complications, poor appearance, and psychological harm to patients associated with existing hanging bag-type artificial anuses.

[0032] The pressure-retractable tube is normally in a contracted state inside the anus, but it will pop out when the intestinal pressure is greater than 100 mmHg to remind the patient to defecate.

[0033] Specifically, the overall height of the anus is approximately 7cm, the outer ring of the protective wing has a diameter of approximately 12cm, and the inner tube has a diameter of approximately 3cm. The outer ring of the protective wing can be trimmed as needed.

[0034] Specifically, the outer wing is 2mm thick, the lattice mesh size is approximately 4-5mm on average, and the mesh portion is approximately 5mm thick.

[0035] Specifically, the inner tube is 2mm thick, the lattice mesh size is approximately 2-3mm on average, and the mesh portion is approximately 5mm thick.

[0036] Specifically, the pressure sensor bottle cap has threads on the inside that fit the outer opening, and the protruding part inside contains a pressure sensor that can be wirelessly connected to a mobile app to alert patients to intestinal pressure and timely defecation.

[0037] Application Implementation Examples

[0038] The artificial anus described above was implanted into rabbits as an animal experimental model.

[0039] New Zealand rabbits weighing 2-3 kg were selected as experimental subjects. 3% pentobarbital was injected intravenously via the ear vein at a dose of 1 ml / kg body weight. After anesthesia, and while monitoring blood saturation and vital signs such as heart rate and blood pressure, the following procedures were performed: The rabbit was fixed in a supine position on the operating table. The fur on the rabbit's abdomen was shaved, and the surgical area was routinely disinfected with iodine-soaked cotton balls. A surgical drape was laid. The surgeon made an incision along the midline of the abdomen down to the perineum, and then along the linea alba. The skin and peritoneum were incised sequentially to open the abdominal cavity. After confirming no abnormalities were found, the junction of the ileum, cecum, and colon was located. The regional artery was ligated, and the intestinal segment was severed from its origin. After thorough disinfection, the proximal intestinal segment was inserted through the inner opening of the artificial anus and sutured to the outer opening. The lattice-like structure of the segment ensured close contact with the outer side of the intestinal segment, guaranteeing effective adhesion. The lattice-like protective wings adhered to the peritoneum wall, and the outer cover was sealed to the outer opening of the artificial anus via a spiral pattern. Two weeks after the artificial anus was implanted, it was observed that the implant adhered firmly to the tissue, and the experimental rabbits were able to defecate smoothly.

[0040] In another embodiment of this invention, the artificial anus described above is implanted into a pig animal model. A 20kg Bama pig is selected as the experimental subject. Anesthesia is induced by intravenous injection of propofol at 2.5-3.5mg / kg, and maintained by intubation with 1-3% isoflurane gas. While monitoring blood saturation and vital signs such as heart rate and blood pressure, the following procedures are performed: the pig is placed supine on the operating table. The abdominal surgical area is prepared, disinfected, and covered with sterile drapes. The surgeon makes an incision along the midline of the abdomen down to the perineum, and uses an ultrasonic scalpel to gradually dissect the distal end of the anus. From the intestine to the anal canal; after disinfecting the pig's perineum, another surgeon used an electrocautery to cut the external anal sphincter and continued to dissect upwards along the anal canal to rejoin the abdominal surgical area, completing the complete dissection of the lower rectum and anus. The intestinal segment was severed 2-3 cm from the anal opening, and the proximal intestinal segment was inserted through the inner opening of the artificial anus tube and sutured to the outer opening of the inner tube. The lattice-like structure of the intestinal segment was in close contact with the outer side of the intestinal segment to ensure effective adhesion later. The lattice-like structure of the protective wings was attached and fixed to the bony pelvis, and the outer cover was sealed to the outer opening of the anus by spiral stitching. One month after the artificial anus was implanted, the implant was found to be firmly adhered to the tissue, and the Bama pig was able to defecate smoothly.

[0041] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, all of which fall within the protection scope of this utility model. The protection scope of this utility model is defined by the appended claims and any equivalent technical solutions.

Claims

1. A 3D-printed composite artificial anus, characterized in that, include: 1) A lattice-like structure outer wing, which replaces the levator ani muscle, fits against the pelvic floor, and is placed on the inner side of the bony pelvis; 2) A lattice-like inner tube replaces the original cancerous intestinal tube and anastomoses with the proximal intestinal tube to achieve the function of fecal transport; 3) A pressure-bearing telescopic tube, connected to a lattice-mesh structured inner tube, which pops out when the intestinal tract reaches a certain pressure; 4) Spiral grooved nozzle and pressure sensor cap: The spiral grooved nozzle allows the nozzle to fit tightly with the cap. The pressure sensor is placed inside the cap and connects to a mobile app via Bluetooth. The lattice-mesh structured outer wing, lattice-mesh structured inner tube, pressure-bearing telescopic tube, and spiral-patterned tube opening are the main body of the anus, while the pressure sensor bottle cap is a separate, reusable assembly / disassembly accessory.

2. The artificial anus according to claim 1, characterized in that, Both the outer wing with its lattice structure and the inner tube with its crystal network structure have a three-dimensional crystal lattice structure.

3. The artificial anus according to claim 1, characterized in that, The pressure-retractable tube is normally in a contracted state inside the anus, but it will pop out when the intestinal pressure is greater than 100 mmHg to remind the patient to defecate.

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