Nasogastric Tube Insertion
Nasogastric tube (NG) insertion is an important skill in the emergency care setting. It requires knowledge of indications, patient preparation, insertion technique and methods to verify correct intragastric positioning.
In this study, we examined the feasibility of a new visual system for nasogastric tube insertion simulation training. The prototype system is composed of an optical fiber and a computer monitor.
Size
An INSERTION TUBE is a long, thin, flexible tube that houses various components. It may be made from a variety of materials, including polyurethane or polyester. It typically has a length of about 1.5 meters.
The insertion tube can be used to insert an endoscope into a patient. The shaft of the insertion tube device can house a range of components, such as an image fiber optic bundle, electronic wires, one or more working channels, articulation wires, and spring guides.
In a more preferred embodiment, the insertion tube has a proximal and distal end. A helical monocoil 14 and a net-like braid 18 are each attached to the proximal and distal ends, respectively, of the formed tube sub-assembly 20. The proximal end of the braid/monocoil portion of the tube sub-assembly 20 is sized to receive a first end collar 22 and a second end collar 26, each having recesses 27, that are sized for receiving the ends of the braid/monocoil portion against an annular shoulder 29.
Another preferred embodiment of the insertion tube has a proximal end that is positioned at an angle between a first axis and a second axis. A flexible section 63 of the proximal end is sized to bend in up, down, left and right directions. This bending section is controlled by four angulation wires that are attached to the proximal end at different positions. These angulation wires are designed to allow the endoscope operator to control the bending section through the rotation of knobs.
A force-modifying element, such as a pulley or an axially movable ferrule, is positioned in the working channel to increase the applied force to the articulatable segment. The force-modifying element may be inserted into the working channel at a position opposite to the proximal end, causing the articulatable segment to bend in one direction.
To minimize the interindividual variation in the predicted insertion lengths of nasogastric tubes, it is important for nurses to use consistent predicting methods. In this study, we compared three predicting methods for the insertion length of gastric tubes: age-related height-based (ARHB); nose-ear-xiphoid (NEX); and nose-ear-mid-umbilicus (NEMU). The ARHB method was found to be more accurate than NEX, and NEX should be replaced by a new method.
Material
An INSERTION TUBE is the flexible tube of an insertion section of an endoscope which is designed to be inserted into a body cavity of a living body. For this reason, the insertion section is preferably to have a suitable flexibility (i.e., the insertion section must be capable of being bent). In addition to having sufficient flexibility, the outer cover of the flexible tube also has to be able to transmit torque and track body cavities. This allows the insertion section to be easily inserted into the body cavity, and reduces the burden on patients.
A variety of materials are used for the flexible tubes of the insertion sections of endoscopes. These materials are known to have properties such as good flexibility, resistance to chemical attack and heat, and biocompatibility. The most commonly used materials for the insertion sections of endoscopes are polyurethane, silicone and latex rubber.
However, the flexibility and biocompatibility of these materials vary, and they can be prone to cracking, puncturing or disintegrating. In order to prevent Bending Section Mesh this, the insertion tubes are coated with a protective coating made of stainless steel or tungsten.
Therefore, a high-quality outer cover material which has excellent flexibility, chemical resistance and heat resistance is needed. Moreover, the material used for making the outer cover must be biocompatible and should not cause any discomfort to the patient when being inserted into the body cavity.
In accordance with this invention, an outer cover material containing a polyurethane elastomer and a polyester elastomer which is mixed together in a uniformly mixed state is obtained. By adjusting the weight average molecular weight of the polyester elastomer and the viscosity of the polyurethane elastomer in a molten state, it is possible to improve the chemical resistance and heat resistance property and the weather resistance property of the outer cover material.
The outer cover material is produced using an extruder with a mixing screw. In this process, the polyurethane elastomer is mixed with the polyester elastomer at a compounding ratio of 0.1 parts by weight of the polyurethane elastomer with respect to 1 part by weight of the polyester elastomer, and the mix is rotated. This mixture is then injected into the head section of the extruder to form an elongated tubular body from which an outer cover is formed.
Shape
A well-designed insertion tube is the heart of any endoscopist’s toolkit. The best ones are engineered to have the optimal blend of flexibility, elasticity, column strength and torquing properties. It’s no secret that these characteristics are essential for accurate insertion into the gastrointestinal tract.
The top of the line gastroscope insertion tubes, for instance, are constructed with a combination of soft and hard resins that make up the outer polymer layer of the tube. The hard resin is used for the proximal 40 cm, which serves as a traumatic aid to snagging through tortuous colons, while the soft resin makes up the rest of the tube, which helps to prevent loop formation in the parts of the digestive tract that have already been straightened by the scope.
One of the more interesting and challenging aspects of a reusable insertion tube is its design and construction. First, a flat, spiral metal band with a diameter of a millimeter or so is wound into a round shape using a special machine called an extruder. A polymer coating is then applied to the outside of this wire mesh, forming a tangle-free surface that’s watertight and biocompatible.
To keep the traction from becoming too much of a good thing, a stiffness control ring is attached to the extruder, which rotates to achieve various levels of rigidity. A well-executed mechanism is a cinch to use, allowing endoscopists to adjust their insertion tube from stiff to supple with ease. The tube also boasts a dazzling array of optical devices and a slew of other features designed to maximize convenience and patient safety.
Function
An INSERTION TUBE is a medical device Bending Section Mesh that allows a physician to access an area of the body. It is designed to help doctors diagnose and treat diseases. In a typical procedure, an INSERTION TUBE is inserted into the esophagus to provide a visual and audio view of the gastrointestinal tract.
In some cases, a doctor may use an INSERTION TUBE to drain fluids or air from a person’s chest. This can help the person’s lungs recover from a collapsed condition or an enlarged lung. The doctor may also use an INSERTION TUBE to remove blood from the pleural space, which can help patients recover from surgery.
INSERTION TUBEs are made of metal and usually have an outer sheath layer. This sheath layer is usually made from a polyurethane or other biocompatible material that has a combination of strength, flexibility, and lubricity.
The inner spiral tube of the INSERTION TUBE is connected to the outer sheath in a manner that does not allow the outer sheath to be deformed or dislodged by pressure from the body. This makes it easier for the doctor to insert the INSERTION TUBE into the body without any problems.
When an INSERTION TUBE is used to insert an endoscope into a passageway, it is important that the endoscope does not rotate with the instrument handle during the procedure. This is because the handle can rotate the display, causing a mismatch in the way that the light from the illumination fibers is displayed.
In order to prevent this from happening, an INSERTION TUBE may have a protective feature that is disposed along the entire length of the working channel. The protection feature can be a ring or other structure that is attached to the distal end of the INSERTION TUBE.
To achieve this, an INSERTION TUBE may include a helical monocoil 14 and a net-like braid 18 that covers the helical monocoil 14. Both the helical monocoil 14 and the net-like braid 18 are attached to each other at proximal and distal ends of the formed tube sub-assembly 20.
