3D printing composite structure type artificial anus

Abstract

The invention discloses a 3D printing composite structure type artificial anus, which comprises: 1) a lattice net structure type outer wing which replaces levator ani muscle, is attached to the pelvic floor, and is arranged on the inner side of the bony pelvis; (2) the lattice net structure type inner tube replaces an original cancerization intestinal canal to be matched with a near-end intestinal canal and is used for achieving the excrement conveying function; (3) the pressed telescopic tube is connected with the lattice net-shaped structure type inner tube and pops up when the intestinal tract reaches a certain pressure; and 4) a spiral thread pipe opening and a pressure sensor bottle cap, three circles of spiral threads are arranged at the spiral thread pipe opening so that the pipe opening can be tightly attached to the bottle cap, and the pressure sensor is arranged in the bottle cap and connected with a mobile phone APP through Bluetooth. Reliable adhesion between the outer wing and the abdominal wall and between the inner tube and the intestinal tube can be achieved, falling of a patient in the normal life process after implantation is prevented, the surgical implantation mode is simple and reliable, and the problems that an existing hanging bag type artificial anus is difficult to nurse, multiple in wound complications, poor in appearance, capable of causing psychological injuries to the patient and the like are solved.

Description

Technical Field

[0001] The invention relates to a 3D printed composite structure artificial anus and relates to the field of medical devices. Background Art

[0002] Enterostomy is a surgical method that interrupts the original intestinal continuity and connects the ileum or colon to the opening of the abdominal wall to achieve the diversion of feces. The feces discharged through the enterostomy is collected in an ostomy bag attached to the opening. Enterostomy is widely used in intestinal segment resection for various trauma or diseases, such as inflammatory bowel disease or colorectal tumors. Enterostomy can be divided into temporary enterostomy and permanent enterostomy. Temporary enterostomy is mostly used for trauma or radical resection of tumors with anus preservation. It is usually reduced 3 months after surgery to restore the original continuity of the intestine. Permanent enterostomy is mostly used for radical resection of tumors that cannot preserve the anus. The enterostomy of these patients will be used for life. There is no doubt that colostomy plays a huge role in helping patients overcome difficulties. However, on the other hand, the current combination of colostomy and ostomy bag has caused many troubles in the patients' lives. In addition to the physiological problems such as parastomal hernia and difficulty in self-care, patients are faced with considerable psychological difficulties, such as social avoidance caused by odor and leakage of ostomy bags, and the embarrassment of losing the original anus as a normal individual. In order to solve the above inconveniences brought by the existing ostomy model, people have developed many related new artificial anuses such as electronic artificial anuses (CN 103815987 A), cone artificial anuses (CN 214511419 U) and in situ implanted artificial anuses (CN 115192247 A), but they are all complicated to maintain, cumbersome to use, lack of reliability, and high risk of surgical implantation, so that they are difficult to be used in clinical practice. Summary of the invention

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

[0004] The technical solution of the present invention to achieve its technical purpose is as follows: A 3D printed composite structure artificial anus, comprising: 1) The lattice mesh structure outer wing replaces the levator ani muscle, fits the pelvic floor, and is placed on the inner side of the bony pelvis; 2) A lattice-shaped inner tube replaces the original cancerous intestinal tube and anastomoses with the proximal intestinal tube to achieve the function of fecal transport; 3) A pressurized telescopic tube connected to a lattice-shaped inner tube that pops out when the intestine reaches a certain pressure; 4) Spiral pipe mouth and pressure sensor bottle cap. There are three spiral patterns at the pipe mouth to make the pipe mouth and the bottle cap fit tightly. The pressure sensor is placed inside the bottle cap and connected to the mobile phone APP via Bluetooth. The lattice mesh structure type outer wing, the lattice mesh structure type inner tube, the pressure-bearing telescopic tube and the spiral tube opening are the main body of the human anus, and the pressure sensor bottle cap is a separate and repeatedly disassembled assembly accessory.

[0005] The outer wing of the lattice structure and the inner tube of the lattice structure both have a three-dimensional lattice structure.

[0006] The pressurized telescopic tube is in a contracted state inside the anus under normal circumstances, and will pop out to remind the patient to defecate when the intestinal pressure is greater than 100 mmHg.

[0007] The beneficial effects of the present invention are: 1. A lattice mesh structure is attached to the inner tube and outer wing of the artificial anus through 3D printing technology. This structure is conducive to cell growth, thereby promoting the firm combination of tissue and artificial anus implant. On the other hand, the part of the implant that is not attached with the lattice mesh structure does not adhere to the tissue, thereby achieving selective adhesion of the artificial anus implant to the organ and effectively fixing the artificial anus.

[0008] 2. The pressurized telescopic short tube and the pressure sensor bottle cap can sense the pressure changes in the intestine to prompt the patient to defecate.

[0009] 3. The spiral outer opening can be firmly combined with the outer opening, which greatly reduces the possibility of odor and feces leakage, and enables the patient to control defecation.

[0010] 4. The 3D printed integrated artificial anus of the present invention can be combined with preoperative digital image reconstruction to achieve personalized product customization that adapts to the patient's anatomical structure.

[0011] 5. The integrated artificial anus of the present invention has a simple and practical structure, is easy to implant and is convenient for patients to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the top view (top view) of the artificial anus.

[0013] Figure 2 This is a front view of an artificial anus.

[0014] Figure 3 This is the bottom view of the artificial anus (bottom view).

[0015] Figure 4 It's the bottle cap of an artificial anus.

[0016] Figure 5 This is a picture of the abdominal stoma suture after surgery.

[0017] Figure 6 This is a picture of the abdominal stoma one week after surgery. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below with reference to the accompanying drawings.

[0019] 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 organ tissue to meet the surgical requirements of patients of different body sizes. Finally, commercial polyurethane acrylate resin is used as the raw material for light-curing 3D printing to obtain the final product. The integrated molding of the main part greatly reduces the tedious assembly process, and a pressure sensor device can be placed in the middle of the outer cover. Example

[0020] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a 3D printed composite structure artificial anus includes: 1) The lattice mesh structure outer wing replaces the levator ani muscle, fits the pelvic floor, and is placed on the inner side of the bony pelvis; 2) A lattice-shaped inner tube replaces the original cancerous intestinal tube and anastomoses with the proximal intestinal tube to achieve the function of fecal transport; 3) The pressurized telescopic tube is connected to the lattice mesh structure inner tube, which pops out when the intestinal pressure reaches a certain level. After the patient has a bowel movement, the telescopic tube can be inserted back into the anus for repeated circulation; 4) Spiral tube mouth and pressure sensor bottle cap. There are three circles of spiral patterns at the tube mouth to make the tube mouth and the bottle cap fit tightly. The patient can unscrew the bottle cap to defecate when needed. The pressure sensor is placed inside the bottle cap and connected to the mobile phone APP via Bluetooth. The patient can be informed of the intestinal pressure on the mobile phone to remind the patient to defecate when the intestinal pressure reaches its peak.

[0021] The lattice mesh structure type outer wing, the lattice mesh structure type inner tube, the pressure-bearing telescopic tube and the spiral tube opening are the main body of the human anus, and the pressure sensor bottle cap is a separate and repeatedly disassembled assembly accessory.

[0022] The described shaped-structured outer wing and lattice-net-structured inner tube both have a three-dimensional lattice structure. This lattice structure is conducive to the growth of cells into the lattice gaps after being implanted in the body, and can achieve reliable adhesion between the outer wing and the abdominal wall, and between the inner tube and the intestinal tract, preventing the implant from falling off during the patient's normal life. The surgical implantation method is simple and reliable, and solves the problems of the existing hanging bag-type artificial anus, such as the difficulty in nursing, multiple wound complications, poor appearance and psychological harm to patients.

[0023] The pressurized telescopic tube is in a contracted state inside the anus under normal circumstances, and will pop out to remind the patient to defecate when the intestinal pressure is greater than 100 mmHg.

[0024] Specifically, the overall height of the human anus is about 7 cm, the outer ring of the wing is about 12 cm in diameter, and the inner tube is about 3 cm in diameter. The outer ring of the wing can be trimmed as needed.

[0025] Specifically, the thickness of the outer wing is 2 mm, the lattice mesh size is about 4-5 mm on average, and the thickness of the mesh part is about 5 mm.

[0026] Specifically, the thickness of the inner tube is 2 mm, the average size of the lattice mesh is about 2-3 mm, and the thickness of the mesh part is about 5 mm.

[0027] Specifically, the inner side of the pressure sensor bottle cap has a thread that fits with the outer opening, and the inner protruding part is buried with a pressure sensor that can be connected to a mobile phone APP wirelessly to remind patients of intestinal pressure and timely defecation and other information.

[0028] Application Implementation Examples The above artificial anus was implanted into rabbits as an animal experimental model.

[0029] New Zealand rabbits weighing 2-3 kg were selected as experimental subjects. 3% pentobarbital was injected into the ear vein at a dose of 1 ml / kg body weight. After anesthesia, the following operations were performed while monitoring blood sample saturation and vital signs such as heart rate and blood pressure were stable: fix the rabbit in the supine position on the operating table. Shave the rabbit's abdominal hair, disinfect the surgical area with iodine cotton balls, lay the operating towel, and the surgeon cut the lower abdomen to the perineal union along the midline incision of the abdomen, make a midline incision along the linea alba, cut the skin and peritoneum in turn, open the abdominal cavity, and after exploring the abdominal cavity for abnormalities, find the junction of the ileum, cecum, and colon, ligate the regional artery, and cut the intestinal tube from the starting point. After sufficient disinfection, the proximal intestinal tube is inserted from the inner opening of the artificial anus inner tube and sutured and fixed to the outer opening of the inner tube. The lattice mesh structure is in close contact with the outside of the intestinal tube to ensure subsequent effective adhesion. The lattice mesh structure-style wings are fitted and fixed to the wall peritoneum, and the outer cover is combined with the outer opening of the inner tube through spiral patterns to close the outer opening of the artificial anus ( Figure 4 ). Two weeks after the artificial anus was implanted, it was found that the implant adhered firmly to the tissue and the rabbits were able to defecate smoothly ( Figure 5 ).

[0030] Another application embodiment of the present invention is to implant the artificial anus into a pig animal model; select a Bama pig weighing 20 kg as an experimental subject, and induce anesthesia by intravenous injection of propofol at 2.5-3.5 mg / kg, and maintain anesthesia by intubation of 1-3% isoflurane gas. When the blood sample saturation and vital signs such as heart rate and blood pressure are stable, the following operations are performed: the pig is placed supinely on the operating table, the abdominal surgical area is disinfected and covered with sterile towels, the surgeon makes a midline incision in the lower abdomen to the perineum, and gradually frees the terminal rectum with an ultrasonic scalpel to the anal canal; after another surgeon disinfected the pig's perineum, he used an electric knife to cut the external anal sphincter, and continued to move upward along the anal canal to reunite with the abdominal surgical area, completing the complete freeing of the lower rectum and anus, and cutting the intestinal tube 2-3 cm away from the anal opening. The proximal intestinal tube was inserted from the inner opening of the artificial anus tube and sutured to the outer opening of the inner tube. The lattice mesh structure was in close contact with the outside of the intestinal tube to ensure subsequent effective adhesion. The lattice mesh structure-style wings were fitted and fixed to the bony pelvis, and the outer cover was combined with the outer opening of the inner tube through the spiral pattern to close the external opening of the human anus. One month after the artificial anus was implanted, it was seen that the implant adhered firmly to the tissue, and the Bama pigs were able to defecate smoothly.

[0031] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, all of which belong to the protection scope of the present invention. The protection scope of the present invention is given by the attached claims and any equivalent technical solutions thereof.

Claims

1. A 3D printed composite structure artificial anus, characterized in that: include: 1) The lattice mesh structure outer wing replaces the levator ani muscle, fits the pelvic floor, and is placed on the inner side of the bony pelvis; 2) A lattice-shaped inner tube replaces the original cancerous intestinal tube and anastomoses with the proximal intestinal tube to achieve the function of fecal transport; 3) A pressurized telescopic tube connected to a lattice-shaped inner tube that pops out when the intestine reaches a certain pressure; 4) Spiral pattern pipe mouth and pressure sensor bottle cap. The spiral pattern pipe mouth is provided with spiral pattern to make the pipe mouth and bottle cap fit tightly. The pressure sensor is placed inside the bottle cap and connected to the mobile phone APP via Bluetooth. The lattice mesh structure type outer wing, the lattice mesh structure type inner tube, the pressure-bearing telescopic tube and the spiral tube opening are the main body of the human anus, and the pressure sensor bottle cap is a separate and repeatedly disassembled assembly accessory.

2. The artificial anus according to claim 1, characterized in that: The outer wing of the lattice structure and the inner tube of the lattice structure both have a three-dimensional lattice structure.

3. The artificial anus according to claim 1, characterized in that: The pressurized telescopic tube is in a contracted state inside the anus under normal circumstances, and will pop out to remind the patient to defecate when the intestinal pressure is greater than 100 mmHg.

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