Ally Bridge Group

Founded in 2013, Ally Bridge Group is a global healthcare investment firm headquartered in New York. It focuses on private and public equity investments in pioneering life sciences companies and technologies that address major unmet medical needs.

Slanix Alex

Portfolio Manager and President, Public Equity

Tinnie Chau

Vice President

Charles Chon

Managing Director

David Nikodem

Managing Director

Sebastian Paquette

Principal, Private Equity

Steven Plachtyna

Vice President, Private Equity

Plachtyna, Steven

Vice President

Kevin Reilly

Managing Director

Reese Yeh

Managing Director

Frank Yu

Founder and CEO

Past deals in Medical Devices

Cardiac Dimensions

Series E in 2025
Cardiac Dimensions, Inc. is a medical device company focused on developing innovative minimally invasive treatments for heart failure and associated cardiovascular issues. Founded in 2000 and headquartered in Kirkland, Washington, with additional operations in Sydney, Australia, and Offenbach, Germany, the company is known for its Carillon Mitral Contour System. This permanent implant is designed specifically for the treatment of functional mitral regurgitation, utilizing a catheter-based approach to reshape the mitral valve and effectively reduce regurgitation. By providing a non-surgical option for patients, Cardiac Dimensions aims to improve outcomes for those suffering from heart-related conditions.

VitalConnect

Venture Round in 2025
VitalConnect is a company that specializes in wearable biosensor technology for wireless patient monitoring. It develops innovative solutions that enable continuous monitoring and recording of patients' vital signs through an adhesive patch applied to the body. The technology integrates expertise in biomedical engineering, data analytics, and chip design, allowing vital data to be displayed on mobile devices and computer systems. This capability empowers healthcare professionals to respond promptly to urgent situations and gain valuable insights into patient health, facilitating informed decision-making in both inpatient and outpatient settings, including hospital monitoring, post-discharge care, and cardiac monitoring.

Aerin Medical

Venture Round in 2025
Aerin Medical is a health technology company that develops non-invasive therapeutic devices to improve nasal breathing. Its portfolio includes VivAer for nasal airway obstruction and RhinAer for chronic rhinitis, along with VivAer Stylus and RhinAer Stylus, plus a compact console that delivers temperature-controlled radiofrequency energy to remodel nasal soft tissue. The technology targets the underlying causes of nasal congestion and offers alternatives to invasive surgery. The company, founded in 2011, is based in Sunnyvale, California.

Kestra Medical Technologies

Private Equity Round in 2024
Kestra Medical Technologies develops and commercializes wearable medical devices and digital health solutions for cardiovascular care. The company provides monitoring, data collection, and therapeutic intervention to protect at-risk patients, with real-time and retrospective analysis. Its Cardiac Recovery System platform integrates monitoring, therapy, digital health tools, and patient support into a single solution, anchored by the ASSURE wearable cardioverter defibrillator designed to prevent sudden cardiac death and aid cardiac recovery. Kestra aims to transform patient outcomes in cardiovascular disease through intuitive, connected technologies.

InSightec

Private Equity Round in 2024
InSightec Ltd. is a pioneering company based in Tirat Carmel, Israel, specializing in non-invasive medical treatments through its Exablate platform, which employs MR guided focused ultrasound technology. Founded in 1999, InSightec develops and distributes systems that address various oncology and gynecology conditions, including the Exablate Neuro for personalized thalamotomy in movement disorders and pain management. The Exablate system has received multiple regulatory approvals, including CE marks and FDA approval, for treatments of symptomatic uterine fibroids, pain from bone metastases, and adenomyosis. The company provides comprehensive support services, including onsite clinical training and maintenance, to medical professionals using its technology in facilities across Israel and internationally. InSightec maintains a strategic partnership with Lantheus Holdings and has expanded its presence in Europe, Asia, and the Americas, earning recognition for its innovative contributions to the field of acoustic surgery.

Mainstay Medical

Private Equity Round in 2024
Mainstay Medical is a medical device company focused on developing and commercializing ReActiv8, an implantable neurostimulation system designed to treat chronic mechanical low back pain by restoring control to the lumbar stabilizing muscles. Headquartered in Dublin, Ireland, it operates in Ireland, the United States, and Australia and collaborates with scientists and clinical experts to deliver therapies for the large underserved population of people with debilitating chronic low back pain. Founded in 2008, the company aims to provide a restorative treatment that improves function and quality of life by reestablishing muscle control in the lumbar spine.

CMR Surgical

Series D in 2023
Founded in 2014, CMR Surgical designs and manufactures medical devices for minimal access surgery. Its flagship product is Versius, a surgical robotic system that enhances laparoscopic surgery by providing surgeons with 3D high-definition imagery and feedback during operations.

LightForce Orthodontics

Series D in 2023
LightForce Orthodontics designs and manufactures customized, 3D-printed orthodontic solutions. Its product family includes Cloud Brackets, a white ceramic polycrystalline alumina bracket system; LightTray, a 3D-printed indirect bonding jig; and TurboTrays, 3D-printed guides for bite correction. The company’s technology enables precise slot dimensions and contoured edges with mass customization based on patient anatomy, and it operates a digital platform that connects orthodontists and technicians to co-create treatment plans. On-demand manufacturing supports patient-specific treatment, aiming to improve clinical outcomes and treatment efficiency.

Relievant Medsystems

Venture Round in 2023
Relievant Medsystems, Inc. is a medical device company focused on developing innovative solutions for chronic axial low back pain. Founded in 2004 and headquartered in Minneapolis, Minnesota, with a development office in Sunnyvale, California, the company has created the Intracept System. This minimally invasive procedure specifically targets the basivertebral nerve, providing relief by blocking pain signal transmission. The Intracept System offers patients a low-risk therapy option aimed at alleviating chronic vertebrogenic low back pain.

Ceribell

Series C in 2022
Ceribell designs and manufactures medical devices for acquiring and interpreting electroencephalography (EEG) data in patients with various neurological conditions. Its flagship product, the Ceribell EEG System, includes a headband that accommodates diverse hair types and head sizes, along with a pocket-sized recorder offering clinical quality EEG and on-device display. The system enables healthcare providers to set up EEG monitoring in just six minutes, with a proprietary Brain Stethoscope function converting brainwaves into sound for easier detection of seizures.

Aerin Medical

Private Equity Round in 2022
Aerin Medical is a health technology company that develops non-invasive therapeutic devices to improve nasal breathing. Its portfolio includes VivAer for nasal airway obstruction and RhinAer for chronic rhinitis, along with VivAer Stylus and RhinAer Stylus, plus a compact console that delivers temperature-controlled radiofrequency energy to remodel nasal soft tissue. The technology targets the underlying causes of nasal congestion and offers alternatives to invasive surgery. The company, founded in 2011, is based in Sunnyvale, California.

Quantum Surgical

Venture Round in 2021
Quantum Surgical develops surgical robotics and intelligent tools to democratize minimally invasive liver cancer treatment. The company's robotics support percutaneous ablation therapies and related minimally invasive procedures, aiming to improve patient outcomes and safety in interventional oncology. By enabling precise robotic assistance, Quantum Surgical seeks to help healthcare providers perform safer, more effective liver cancer interventions, with potential for higher cure rates and shorter recovery times.

Elligo Health Research

Series E in 2021
Elligo Health Research, Inc. is a healthcare organization focused on improving the clinical research landscape by bringing research directly to healthcare clinics. Founded in 2016 and headquartered in Austin, Texas, the company utilizes advanced healthcare informatics and electronic health records to enhance patient and physician participation in clinical trials. By enabling physicians to conduct trials within their practices, Elligo eliminates common barriers related to patient enrollment and study delays, while providing essential infrastructure and support. This approach not only accelerates the development of new pharmaceutical, biotechnology, and medical device products but also ensures that patients benefit from access to cutting-edge therapies without the logistical challenges of traditional trials. Elligo's model empowers physicians and offers patients the opportunity to contribute to clinical research, ultimately fostering advancements in healthcare for future generations.

Imperative Care

Series D in 2021
Founded in 2015, Imperative Care specializes in developing innovative medical technologies aimed at improving stroke treatment. Its flagship products include the Large Distal Platform catheter for deeper reach and the ZOOM Aspiration System for clot removal. The company's mission is to enhance treatment speed and effectiveness, ultimately optimizing patient recovery.

Mainstay Medical

Private Equity Round in 2021
Mainstay Medical is a medical device company focused on developing and commercializing ReActiv8, an implantable neurostimulation system designed to treat chronic mechanical low back pain by restoring control to the lumbar stabilizing muscles. Headquartered in Dublin, Ireland, it operates in Ireland, the United States, and Australia and collaborates with scientists and clinical experts to deliver therapies for the large underserved population of people with debilitating chronic low back pain. Founded in 2008, the company aims to provide a restorative treatment that improves function and quality of life by reestablishing muscle control in the lumbar spine.

MedAvail

Series E in 2020
MedAvail Holdings, Inc. is a technology-enabled pharmacy company based in Mississauga, Canada, specializing in the integration of automated pharmacy services within clinics and other healthcare settings. The company operates primarily through two segments: Retail Pharmacy Services and Pharmacy Technology. Its Retail Pharmacy Services segment generates most of its revenue by operating SpotRx, a full-service retail pharmacy that utilizes MedAvail's automated technology, primarily serving Medicare patients in the United States. The Pharmacy Technology segment focuses on the development and commercialization of the MedAvail MedCenter, an advanced robotic dispensing platform that can be sold or leased to third-party clients. Additionally, MedAvail offers telehealth solutions, enabling remote consultations with pharmacists via on-site kiosks and home delivery services.

Rapid Micro Biosystems

Venture Round in 2020
Rapid Micro Biosystems, Inc. is a life sciences technology company specializing in the detection of microbial contamination in the pharmaceutical, biotechnology, and personal care product manufacturing sectors. Founded in 2006 and based in Lowell, Massachusetts, with an additional office in Germany, the company offers the Growth Direct System, an automated platform designed to modernize and streamline microbial quality control testing workflows. This system includes automated imaging and analysis of proprietary consumables, providing a non-destructive method for microbial enumeration. In addition to its core products, Rapid Micro Biosystems offers services such as on-site installation, regulatory compliance assistance, validation, technical support, and training. Its solutions are applicable in environmental monitoring, water testing, and bioburden testing, facilitating the efficient manufacturing and safe release of healthcare products like biologics and vaccines.

Pulmonx

Series H in 2020
Pulmonx Corporation is a medical technology company specializing in minimally invasive solutions for the diagnosis and treatment of chronic obstructive pulmonary disease (COPD), particularly severe emphysema. Its primary offerings include the Zephyr Endobronchial Valve, designed for patients with hyperinflation due to emphysema, as well as the Chartis Pulmonary Assessment System, which assesses collateral ventilation, and the StratX Lung Analysis Platform, a cloud-based service that analyzes computed tomography data to identify suitable treatment areas. Pulmonx aims to improve the quality of life for patients who remain symptomatic despite medical management and may not be candidates for surgical interventions. The company has received FDA pre-market approval for the Zephyr Valve and has established a global presence, serving markets in the United States, Europe, the Middle East, Africa, and the Asia-Pacific region. Founded in 1995 and headquartered in Redwood City, California, Pulmonx has become a leader in interventional procedures for COPD, supported by extensive clinical evidence demonstrating the effectiveness of its technologies.

Imperative Care

Series C in 2019
Founded in 2015, Imperative Care specializes in developing innovative medical technologies aimed at improving stroke treatment. Its flagship products include the Large Distal Platform catheter for deeper reach and the ZOOM Aspiration System for clot removal. The company's mission is to enhance treatment speed and effectiveness, ultimately optimizing patient recovery.

Venclose

Series C in 2019
Venclose, Inc. is a medical technology company based in San Jose, California, founded in 2014. The company specializes in developing endovenous radiofrequency ablation therapy systems aimed at treating chronic venous insufficiency. Venclose's technology focuses on improving both the physician and patient experience during the treatment of damaged veins. The company's solutions facilitate ease of navigation and positioning during procedures, minimize invasiveness, and provide real-time data to inform treatment decisions. By enabling a straightforward catheter plug-in, Venclose empowers medical professionals to effectively address venous reflux, ultimately restoring healthy blood flow in patients.

Pulmonx

Series G in 2019
Pulmonx Corporation is a medical technology company specializing in minimally invasive solutions for the diagnosis and treatment of chronic obstructive pulmonary disease (COPD), particularly severe emphysema. Its primary offerings include the Zephyr Endobronchial Valve, designed for patients with hyperinflation due to emphysema, as well as the Chartis Pulmonary Assessment System, which assesses collateral ventilation, and the StratX Lung Analysis Platform, a cloud-based service that analyzes computed tomography data to identify suitable treatment areas. Pulmonx aims to improve the quality of life for patients who remain symptomatic despite medical management and may not be candidates for surgical interventions. The company has received FDA pre-market approval for the Zephyr Valve and has established a global presence, serving markets in the United States, Europe, the Middle East, Africa, and the Asia-Pacific region. Founded in 1995 and headquartered in Redwood City, California, Pulmonx has become a leader in interventional procedures for COPD, supported by extensive clinical evidence demonstrating the effectiveness of its technologies.

Quantum Surgical

Series A in 2018
Quantum Surgical develops surgical robotics and intelligent tools to democratize minimally invasive liver cancer treatment. The company's robotics support percutaneous ablation therapies and related minimally invasive procedures, aiming to improve patient outcomes and safety in interventional oncology. By enabling precise robotic assistance, Quantum Surgical seeks to help healthcare providers perform safer, more effective liver cancer interventions, with potential for higher cure rates and shorter recovery times.

GRAIL

Series C in 2018
GRAIL focuses on developing technologies for early cancer detection. Founded in 2016, the company specializes in a pan-cancer screening test that measures circulating nucleic acids in blood using high-intensity sequencing.

ShockWave Medical

Series C in 2016
ShockWave Medical is a medical device company focused on developing and commercializing intravascular lithotripsy technology to treat calcified plaque in peripheral vascular, coronary vascular, and valvular diseases. The company markets lithoplasty catheters, including M5 for above-the-knee peripheral artery disease, C2 for coronary artery disease, and S4 for below-the-knee lesions, designed to modify calcium and improve vessel compliance before angioplasty or stent delivery. Its sonic pressure wave technology aims to limit injury to healthy tissue and facilitate procedures such as transcatheter coronary interventions and valve therapies. The business serves interventional cardiologists, vascular surgeons, and interventional radiologists through a direct sales force and distributors. It operates in the United States, Germany, the rest of Europe, and other international markets. Founded in 2009, ShockWave Medical is headquartered in Santa Clara, California.

Sorrento Therapeutics

Post in 2016
Sorrento Therapeutics, Inc. is a clinical-stage biopharmaceutical company based in San Diego, California, focused on developing innovative therapies for cancer, autoimmune diseases, inflammatory conditions, and neurodegenerative disorders. The company leverages its proprietary G-MAB antibody library to create a diverse range of treatments, including chimeric antigen receptor T-cell therapies, bispecific antibodies, and antibody-drug conjugates. Key products in development include anti-CD38 CAR-T therapy for multiple myeloma and a non-opioid neurotoxin, resiniferatoxin, aimed at treating severe pain in late-stage cancer and osteoarthritis. Sorrento also explores drug delivery technologies such as Sofusa, which targets the lymphatic system, and ZTlido, a lidocaine delivery system for postherpetic neuralgia. Additionally, the company is involved in various collaborations to enhance its research and development efforts, including projects focused on COVID-19 therapeutics. With a commitment to addressing significant unmet medical needs, Sorrento Therapeutics aims to advance its diverse pipeline through both innovative drug development and strategic partnerships.

TESARO

Post in 2016
Tesaro, Inc. is an oncology-focused biopharmaceutical company established in 2010 and headquartered in Waltham, Massachusetts. The company is dedicated to developing and commercializing cancer therapeutics and supportive care products. Its primary offerings include ZEJULA, a potent oral poly polymerase inhibitor for the maintenance treatment of recurrent ovarian, fallopian tube, or primary peritoneal cancer, and VARUBI, a neurokinin-1 receptor antagonist designed to prevent chemotherapy-induced nausea and vomiting. Additionally, Tesaro is engaged in the development of several immunotherapy antibody candidates, including TSR-042, TSR-022, and TSR-033, all currently in phase I clinical trials. The company collaborates with various organizations, such as AnaptysBio, Janssen Biotech, and Merck Sharp & Dohme, to enhance its research and development efforts. Tesaro aims to leverage its management team's expertise to identify and commercialize innovative treatments that improve the lives of cancer patients. As of January 2019, Tesaro operates as a subsidiary of GlaxoSmithKline.

ShockWave Medical

Series B in 2015
ShockWave Medical is a medical device company focused on developing and commercializing intravascular lithotripsy technology to treat calcified plaque in peripheral vascular, coronary vascular, and valvular diseases. The company markets lithoplasty catheters, including M5 for above-the-knee peripheral artery disease, C2 for coronary artery disease, and S4 for below-the-knee lesions, designed to modify calcium and improve vessel compliance before angioplasty or stent delivery. Its sonic pressure wave technology aims to limit injury to healthy tissue and facilitate procedures such as transcatheter coronary interventions and valve therapies. The business serves interventional cardiologists, vascular surgeons, and interventional radiologists through a direct sales force and distributors. It operates in the United States, Germany, the rest of Europe, and other international markets. Founded in 2009, ShockWave Medical is headquartered in Santa Clara, California.

Conventus Orthopaedics

Series A in 2014
Conventus Orthopaedics offers orthopedic and sports medicine services, including surgery, reconstructive procedures, spine surgery, joint replacement, sports medicine, physical therapy, and fracture care. Founded by medical professionals in 2009, the company focuses on less invasive treatments for complex periarticular fractures. It employs advanced nitinol technology to create a platform that delivers robust fixation and reliable repairs. The practice is located in Maple Grove, Minnesota.
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