During the use of biopsy forceps, it is of great importance to moderate the using strength. The key to the full use of biopsy forceps is mainly relying on the mastery of the correct strength. In recent years, most biopsy forceps have adopted a rigid four-link structure, making the use of biopsy forceps more convenient. Thus, once the biopsy clamp thread is broken, the normal welding process will not be able to fix the problem as metal barbs may form. This is the mechanism by which we see the formation of the biopsy clamp thread cavity. That is to say, as the small hole and the molten metal surrounding the hole walls move forward with the forward speed of the leading beam, the molten metal will immediately fill the void left after the hole moves away and condenses with it, and the weld is then formed.Īll of the foregoing processes can happen very quickly so that the welding speed of biopsy forceps can easily reach several meters per minute. As the beam will continuously enter the small hole, the material outside the hole will be continuously flowing, and the hole will be always in a stable state of flowing as the beam moves. The liquid flow and wall surface tension outside the hole walls will be held and dynamically balanced with the continuously generated vapor pressure inside the hole cavity. The liquid metal will be surrounded by solid material (while in most conventional welding processes and laser conduction welding, energy is first deposited on the surface of the work-piece and then transported to the interior by transfer). ![]() The small hole will then be filled with high temperature steam generated by continuous evaporation of the wall material under beam irradiation, and the four walls of the hole will be surrounded by molten metal. Heat is then transferred from the outer wall of this high-temperature hole to melt the metal surrounding the hole cavity. ![]() This small hole filled with vapor is just like a black hole and it can absorb almost all of the incident beam energy, and the equilibrium temperature inside the hole cavity will reach about 2500☌. Under high enough power density laser irradiation, the material will evaporate and a small hole will be formed. The energy conversion mechanism is accomplished through the "Key-hole" structure. The laser radiation will first heat the surface that is needed to be machined, and then the surface heat will spread to the inside through heat conduction, and the work-piece will melt to form a specific melt pool by controlling the laser parameters such as the width, energy, peak power and repetition frequency of the laser pulse. Normally, the laser welding of biopsy forceps can be realized by continuous or pulsed laser beam. ![]() There are many types of endoscopic biopsy forceps, including standard type, side-opening type, head-end with needle type, round cup-shaped, tooth-shaped cup-shaped, and so on. Biopsy forceps are indispensable for gastrointestinal endoscopic biopsy, and they are one of the most common accessories used by endoscopic nurses. Biopsy is the technique of removing diseased tissue from the patient's body by cutting, clamping or puncturing for pathological examination, as needed for differential diagnosis and treatments.
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