Infection, Soft Tissue | Direct Antibiotic Delivery of Cefazolin Into Soft Tissue Infections Using Subcutaneous Injection and Ultrasonic Dispersion

Infection, Soft Tissue research study

What is the primary objective of this study?

This study focuses on a new drug delivery system (Direct Antibiotic Delivery) to treat soft tissue infections. In this study, cefazolin is delivered directly to the target tissues using subcutaneous injection of antibiotic solution and then dispersed using high-frequency external ultrasound. Using this system, a much higher concentration of antibiotic can be achieved than through traditional treatment methods. Unlike traditional delivery methods, Direct Antibiotic Delivery does not rely on blood supply and is beneficial for subjects with Diabetes or subjects who have received radiation therapy and blood supply is limited.

Who is eligible to participate?

Inclusion Criteria: - Subjects with pathologically confirmed presence of serious or immediately life-threatening soft tissue infection, cellulitis or open wound caused by bacteria for which cefazolin at this concentration is likely to have activity to inhibit the bacteria, for example, Staphylococcus species or Streptococcus species, Escherichia coli, Proteus mirabilis. - Wounds must demonstrate the presence of skin and skin structure infection, which may be demonstrated by one or more of the following: Culture results as aforementioned, swelling of the tissues, discoloration, open wounds, and/or drainage, which may or may not be associated with pain and/or tenderness. - Confirmed presence of soft tissue cellulitis caused by bacteria for which cefazolin is likely to have activity to inhibit the bacteria will be evidenced by microbiologic cultures taken no greater than ten (10) days prior to treatment. - Subject must have previously been treated by a qualified licensed physician using traditional surgical and/or medical treatments, which may include courses of IV antibiotics, but where Subject was unable to resolve their infection through traditional surgical and/or medical treatments for soft tissue cellulitis caused by bacteria for which cefazolin is likely to have activity to inhibit the bacteria at a maximum concentration of 1 gram per 100 ml saline, as demonstrated by the presence of induration, redness, open wounds, and/or soft tissue swelling. - Subject must be referred by his or her treating physician to the Wound Care Center of the investigational hospital. - The Wound Care Center of the investigational hospital has confirmed that standard therapies have failed to cure the subject's infection and the infection is still present. - Subjects are not on concomitant antibacterial drugs since these drugs have failed to treat the subject's infection. - Subject may be male or female and must be at least 18 years of age. - Subject must sign informed consent as approved by the Institutional Review Board (IRB). Exclusion Criteria: - Subjects who have not received treatment by traditional surgical and/or medical therapies. - Subjects who are allergic to cefazolin. - Subjects who have a serious allergy to penicillin. - Subjects with infections that involve body cavities. - Subjects designated to be vulnerable, i.e., pregnant women, subjects under the age of 18, and subjects who need to have consent provided by a Legally Authorized Representative (LAR). - Subjects who are unable or unwilling to comply with the protocol. - Subjects who have a history of clinically significant or uncontrolled cardiac disease, including congestive heart failure, angina, myocardial infarction, arrhythmia, including New York Heart Association (NYHA) functional classification of 3. - Subjects who have any other life-threatening illness or organ system dysfunction, which, in the opinion of the investigator, would either compromise subject safety or interfere with the evaluation of the safety of the test drug. - Subjects who cannot understand English. - Subjects who have received a treatment under this study are not eligible for re-admittance for thirty (30) days from the date of their last treatment.

Which medical condition, disease, disorder, syndrome, illness, or injury is researched?

Infection, Soft Tissue

Infection, Wound


Diabetic Foot Ulcer

Study Interventions

Interventions can include giving participants drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available or noninvasive approaches such as surveys, education, and interviews.

Drug:CefazolinCefazolin is approved for clinical use for some bacterial infections. The standard routes of administration are Intramuscular (IM) and intravenous (IV). For this study, the route of administration will be delivered using the Silberg TPS, which delivers the cefazolin by subcutaneous injection followed by external ultrasonic dispersion. The concentration delivered is one gram/100 ml saline. Cefazolin can safely be given IM at the much higher concentration of 1 gram/2.5 ml of saline. The maximum dose that may be administered is 3 grams in 300 ml, which is within the approved guidelines of a daily dose. The concentration of antibiotic will be the same; only the dose may vary depending on the size of the wound or area of induration. Each subject will receive only one treatment in this study.

Device:Silberg Tissue Preparation SystemThe TPS is FDA cleared for the subcutaneous infusion and ultrasonic dispersion of tumescent fluid excluding the parenteral delivery of drugs. Under this study, the TPS is a device to deliver cefazolin by subcutaneous injection followed by external ultrasonic dispersion. The TPS consists of a medical grade peristaltic pump that is used to infuse antibiotic solution using a sterile blunt-tipped infusion cannula into a superficial subcutaneous plane. After the cannula has been removed, high frequency external ultrasound is delivered transcutaneously over the area of infusion in order to disperse the antibiotic solution. The power density is within the range allowed for physical therapy.

Study Arms

Research studies and clinical trials typically have two or more research arms. An arm is a group of people who receive the same treatment in the study.

Study Status

No longer available

Start Date:

Completed Date:


Type: Expanded Access


Primary Outcome:

Secondary Outcome:

Study sponsors, principal investigator, and references

Principal Investigator: Barry N Silberg, MD

Lead Sponsor: Sonescence, Inc.


More information:

Weninger KR, Camara CG, Putterman SJ. Observation of bubble dynamics within luminescent cavitation clouds: Sonoluminescence at the nano-scale. Phys Rev E Stat Nonlin Soft Matter Phys. 2001 Jan;63(1 Pt 2):016310. Epub 2000 Dec 27.

Discuss Cellulitis