Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 568 for “"needle"”.
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Investigation of Needle-Tissue Interaction during Ultrasonic Needle Intervention
Needle intervention procedures are now frequently conducted in hospitals and clinics, because of the benefits of minimal invasiveness, possible manoeuvrability with needle deflection, and good compatibility with other medical procedures like imaging in laparoscopy. A lab-based prototype of …
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Needle-free injection nozzle geometry
The development of needle-free injection (NFI) delivery systems has become increasingly important because of the advantages it affords such as increased patient acceptability, enhanced occupational safety for health providers, safe disposal, and increased speed of mass vaccination in the face of …
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Intradermal needle-free powdered drug injection
This thesis presents a new method for needle-free powdered drug injection. The design, construction, and testing of a bench-top helium-powered device capable of delivering powder to controllable depths within the dermis is presented. This device uses a jet of gas undergoing choked flow to entrain …
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An optical smart needle : point-of-care technologies for integrated needle guidance using optical frequency domain ranging
Obtaining accurate needle placement is of critical importance in many medical scenarios. In the setting of fine needle aspiration biopsy (FNAB), manual palpation is often the only cue for determining the optimal position of the needle. As a result, FNAB procedures frequently yield non-diagnostic …
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Needle-less injection system for drug delivery
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.
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Needle Localization for Breast Biopsy: The Patient's Experience
<p>The needle localization procedure for breast biopsy (NLP) can be painful and distressing for some women. This study was carried out to learn what factors might increase or decrease NLP pain and distress, and to gain insight into possible interventions to make the procedure more comfortable for …
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Needle Length Required for Intramuscular Injection in Women
… of the subcutaneous tissue and the length of needle required to reach the musculature. Gross body measurements were correlated with the internal measurements to develop criteria predicting the depth on other individuals. Review of the literature showed that most authorities recommend two to …
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Instrumentation to characterize needle insertion into biological tissue
… deliver drugs through the human skin using micro needles. It is crucial to characterize the insertion of micro needles into biological tissues. Hence, instrumentation will be designed and fabricated for the characterization of micro needle insertion. This thesis focuses on the design and …
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Needle-free drug delivery using shock wave techniques
A recent advancement in the area of needle-free injection systems has been the development of devices capable of epidermal delivery of powder medications. These devices use high-pressure compressed gas to accelerate drug particles 2 to 50 gpm in size to velocities of 200 to 1000 m/s. At these …
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A Lorentz-force actuated needle-free intraocular injection device
… numerous complications. Lorentz-force actuated needle-free jet injection has been shown to successfully deliver fluid to various layers of skin, and, by its nature, may reduce intravitreal injection anxiety and complications. The challenges of adapting current Lorentz-force actuated needle-free …
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Design of an endoscopic biopsy needle with flexural members
… sample from a patient, current endoscopic biopsy needles generally do not preserve tissue histology and often require multiple attempts to obtain a tissue sample. This paper presents an endoscopic biopsy needle with internal flexures that enable tissue to enter the hollow needle and then be …
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Lorentz-force actuated needle-free injection for intratympanic pharmaceutical delivery
… using a standard, 0.31 mm (30-gauge) hypodermic needle. The feasibility of using the jet injector to deliver drug to the inner ear with less tissue damage than seen in standard procedures is shown offering an avenue for improved inner ear drug delivery methods and technology.
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Characteristics of pine needle combustion in a semi-gasifier burner
… was to develop a stronger understanding of pine needle combustion behavior in a semi-gasifier, in order to ultimately design an effective pine needle cook stove for people in the developing world. Pine needles are a cheap, energy-dense fuel source that can be harnessed for cooking purposes, but …
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A Lorentz-force actuated controllable needle-free drug delivery system
The advantages of delivering injections via needle-free methods are numerous. However, conventional methods for needle-free injection lack sufficient control over depth of penetration and shape of injection. Thus, a needle-free injector was designed, constructed, and tested, using a controllable …
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Smart Surgical Needle Actuated by Shape Memory Alloys for Percutaneous Procedures
… today are performed percutaneously using needle-based procedures, i.e. through the skin and soft tissue. Needle insertion is known as one of the recent needle-based techniques that is used in several diagnostic and therapeutic medical procedures such as brachytherapy, thermal ablations and …
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An investigation of the needle like structure in high speed steel
Thesis--Michigan State College of Agriculture and Applied Science, 1927
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Single Crystal Based Ultrasound Actuated Needle For Regional Anaesthesia and Biopsy
Ultrasound guidance of needle-based regional anaesthesia and tissue biopsy is widely used in clinical practice. Ultrasound imaging has improved the efficacy and reduced some side effects during regional nerve block. However, the presentation and interpretation of real-time ultrasound guided needle …
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A needle-tip embedded fibre optical force sensor for tissue identification
… identification of biological tissue types during needle insertion is subject to a lack of precise monitoring techniques, especially in an intensive magnetic resonance environment. One approach to improve this situation is to attach optical sensors to the surgical needle. In this research, a …
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