Photochemical Tissue Bonding
Photochemical Tissue Bonding - Related Videos
10:29
Photochemical Initiation Of Radical Polymerization Reactions
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2023
Source: David C. Powers, Tamara M. Powers, Texas A&M In this video, we will carry out the photochemically initiated polymerization of styrene to generate polystyrene, which is an important commodity plastic. We will learn the fundamentals of photochemistry and use simple photochemistry to initiate radical polymerization reactions. Specifically, in this module we will examine the photochemistry of benzoyl peroxide and its role as a photo-initiator of styrene polymerization reactions. In the...
02:49
Bond Energies and Bond Lengths
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2020
Stable molecules exist because covalent bonds hold the atoms together. The strength of a covalent bond is measured by the energy required to break it, that is, the energy necessary to separate the bonded atoms. Separating any pair of bonded atoms requires energy — the stronger a bond, the greater the energy required to break it. The energy required to break a specific covalent bond in one mole of gaseous molecules is called the bond energy or the bond dissociation energy. The bond energy for a...
02:32
Bonding in Metals
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2020
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. Electron Sea Model Most metal atoms do not possess enough valence electrons to enter into an ionic or covalent bonding. However, the valence electrons in metal atoms are loosely held due to their low electronegativity or attraction with the nucleus. The ionization energy of metal atoms (energy required to remove an electron from...
05:41
Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods
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Cited by 4 •
2016
A protocol for the photochemical oxidative growth of small crystalline iridium oxide nanoparticles on the surface of CdSe@CdS seeded rod nanoparticles is presented.
02:45
Valence Bond Theory
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2020
Overview of Valence Bond Theory Valence bond theory describes a covalent bond as the overlap of half-filled atomic orbitals (each containing a single electron) that yield a pair of electrons shared between the two bonded atoms. The orbitals on two different atoms overlap when a portion of one orbital and a portion of a second orbital occupy the same region of space. According to valence bond theory, a covalent bond results when two conditions are met: (1) an orbital on one atom overlaps an...
FAQs
The photosensitizing agent first associates with proteins at the tissue surfaces. Targeted illumination then activates photochemical reactions that generate reactive intermediates. These intermediates promote covalent crosslinks between proteins, creating a strengthened interface rather than relying only on external mechanical forces. The resulting molecular connections help maintain tissue joining during surgical repair.
Covalent crosslinks provide chemical connections across the apposed tissue interface. This distinguishes the method from closure approaches that depend primarily on sutures or other mechanical fasteners. In bioengineering, forming these links can support precise tissue alignment while reducing dependence on foreign materials, which is relevant to repairs where interface stability and material minimization are important.
Suture-based closure uses implanted mechanical elements to hold tissue edges together, whereas photochemical tissue bonding uses a photosensitizing agent and targeted light to create protein crosslinks at the interface. The photochemical approach can therefore join tissues without relying solely on sutures. Its value is greatest when precise alignment and reduced foreign material are priorities.
Bonding is localized by two linked conditions: association of the photosensitizing agent with the tissue proteins and targeted illumination of the intended interface. Because light activation is directed, the photochemical reaction can be focused on selected tissue regions rather than applied indiscriminately. This targeting supports controlled repair and helps preserve the method's precision in bioengineering applications.
A procedure begins by bringing the biological tissue surfaces into the intended alignment and associating them with a photosensitizing agent. The selected interface is then exposed to targeted illumination, which activates reactive intermediates and promotes covalent protein crosslinking. The process concludes with a bonded tissue interface that can support repair without depending solely on mechanical fasteners.
Reported application areas include wound closure, vascular repair, nerve repair, and corneal procedures. The technique can also support integration of engineered tissues, making it relevant to regenerative medicine and biomimetic repair strategies. These uses reflect its ability to create localized tissue interfaces while offering an alternative to repairs based exclusively on sutures or similar materials.
Photochemical tissue bonding provides a way to connect biological tissues and engineered tissues through protein-level crosslinking at their interface. In regenerative medicine, that capability may help integrate constructed tissue with existing biological structures. Its suture-free, localized approach also supports bioengineering efforts to design repairs that more closely reproduce organized tissue connections.
The technique may contribute to more precise tissue alignment and reduced use of foreign materials during repair. Those features are relevant to minimally invasive surgery because they support localized joining without relying solely on mechanical closure devices. More broadly, the approach links controlled light activation with tissue repair, providing a basis for developing biomimetic surgical strategies.