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Mini C-arm

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FluoroScan Mini C-arm (HealthMate, Inc., 1986)

Mini C-arm (also called miniature C-arm, mobile C-arm or extremity fluoroscope) is a compact, portable fluoroscopic X-ray imaging system designed for real-time imaging of the small bones and joints of the extremities. It takes its name from the C-shaped arm connecting the X-ray source on one end to the image detector on the other.

The Mini C-arm was commercially cleared in the United States in February 1985.[1] In February 2010, Radiology Today reported the device as used in applications for orthopedics, emergency rooms and pediatric imaging. Same use especially for the upper limb surgery was acknowledged by The Journal of Hand Surgery and others.[2][3][4]

Before its introduction, the only available fluoroscopy systems were full-size stationary C-arms designed for spinal and large-joint surgery but costs expensively. As referenced in U.S. Patent No. 10,076,302, "existing fluoroscopic machines are also expensive and emit large doses of radiation".[5][6][7] The Mini C-arm is a fluoroscopic imaging device used for extremity imaging.[8][9][10][11][8]

Clinical applications

[edit]

The Journal of Bone and Joint Surgery confirmed the device's role in both pediatric fracture care and radiation safety optimization.[12] The Annals of Emergency Medicine documented safety and effectiveness for distal extremity fractures in 1994.[13] Foot & Ankle International published a peer-reviewed documentation of its use in foot and ankle surgery in 1993.[9] Radiology Today described it as standard equipment in hospitals, surgery centers, and physician offices.[2] A 2025 systematic review in the British Journal of Perioperative Practice documented continued and increasing adoption in hand and wrist surgical practice.[14]

Hand and wrist surgery

[edit]

The Mini C-arm introduced portable intraoperative fluoroscopic guidance to hand and wrist surgery. Percutaneous fixation has been documented as a guided extremity procedure in Mini C-arm hand and wrist surgery.[4][15][11] The device also enabled wider clinical use of fluoroscopic wrist motion assessment for carpal instability, which is a dynamic condition not visible on static X-rays.[16] A formal clinical protocol was published in the Journal of Hand Surgery in 2018.[17] Wolf and Weiss reported improved operative efficiency in hand surgery, and a 2022 prospective study reported a 24 minute reduction per postoperative visit and cost savings exceeding $9,500 per patient series.[18][19]

Foot and ankle surgery

[edit]

Documentation of the Mini C-arm in foot and ankle surgery has dated since 1993. An article in Foot & Ankle International entitled "The Fluoroscan Imaging System in Foot and Ankle Surgery" described its use.[9] Key applications of the Mini C-arm include minimally invasive hallux valgus correction, including the MICA (Minimally Invasive Chevron-Akin) technique, as well as percutaneous lag screw fixation of ankle fractures and fluoroscopy-guided K-wire fixation of forefoot deformities. A study in Lower Extremity Review titled "Minimally Invasive Bunion Surgery for Hallux Valgus: A Surgical Technique" also documents these applications.[20][21] Various studies, including a prospective series of 1,064 consecutive foot and ankle procedures, confirmed that all radiation exposures remained below international safety limits.[22][23][24]

Pediatric orthopedic surgery

[edit]

The Mini C-arm's lower dose profile is particularly relevant in pediatrics.[25] It is used for closed reduction and percutaneous pinning of supracondylar humerus fractures. Hsu et al. (JBJS, 2014) studied optimal C-arm positioning to minimize radiation to both patient and surgeon during this procedure.[12] Fanelli et al. (Journal of Pediatric Orthopaedics, 2016) demonstrated a 23-minute reduction in patient waiting time per visit and improved clinical efficiency.[26]

Emergency medicine

[edit]

Emergency departments adopted Mini C-arms for closed reduction of distal radius fractures, foreign body localization, and joint aspiration.[27][28][29] An early peer-reviewed documentation appeared in the Annals of Emergency Medicine (Lee, Orlinsky and Chan, 1994).[13] Lee et al. (JBJS, 2011) established in 279 pediatric forearm fractures that Mini C-arm guidance improved reduction quality, decreased radiation exposure, and reduced the need for repeat reductions.[30] During the COVID-19 pandemic, Mini C-arm fluoroscopy enabled UK hand clinics to maintain continuity of care while avoiding patient transfers to imaging departments.[31]

Design and Technical Characteristics

[edit]

A Mini C-arm consists of the following principal components. Its architecture differs from full-size fluoroscopy C-arms in that it is built with a smaller physical arc, lower power generator capacity, and lighter construction, optimized for extremity imaging of hands, wrists, feet, and ankles.

  • C-arm assembly: A C-shaped arm with the X-ray tube at one end and the image detector at the other. The arm rotates around the patient's extremity, typically 120°-150°, enabling anteroposterior, lateral, and oblique views without repositioning the patient. The C-frame design allows the device to rotate through vertical, inverted, and horizontal configurations, reducing scatter radiation patterns around the operating table during live procedures.[32]
  • X-ray source (tube head): A micro-focus X-ray tube operating at low tube current and a source-to-detector distance of approximately 40 cm, producing significantly less scattered radiation.[32]
  • Image detector: Early systems used a small image intensifier, typically 4-6.7 cm diameter. The evolution from vacuum-tube image intensifiers to flat-panel detectors (FPDs) represents an important engineering advancement: FPD systems offer a smaller, more compact mechanical frame, extended dynamic range, and elimination of the spatial (geometric) distortion inherent to the curved input screen of a vacuum-tube intensifier.[33]
  • Dynamic fluoroscopy capability: The system processes both static radiographs and real-time dynamic imaging, allowing the clinician to capture moving physiological actions such as joint flexion intraoperatively.[4]
  • Monitor and processing unit: A mounted display (typically 20-24 inches) showing real-time fluoroscopic images. Digital capabilities include image capture, cine loops, zoom, contrast adjustment, and DICOM export.[32]
  • Mobile cart: A wheeled cart housing electronics, monitor arm, and C-arm mounting. Current system weights range from approximately 30-100 pounds (14-45 kg), enabling room-to-room mobility.[32]
  • Foot pedal and surgeon-operated controls: The surgeon activates X-ray exposure via a floor-mounted foot pedal. The control systems and lightweight construction are designed to be surgeon operated.[32]

Radiation Safety

[edit]

The Mini C-arm produces less scatter radiation than standard fluoroscopic C-arms, primarily due to its shorter source-to-detector distance and lower tube current. Key peer-reviewed findings:

  • Athwal et al. (2005, Journal of Hand Surgery) demonstrated universally lower radiation exposure across all hand surgery configurations.[34] Singer (2005, Journal of Hand Surgery) provided quantified measurement of radiation exposure specifically to the surgeon's hands, establishing the safety basis for routine clinical use.[35]
  • Dawe et al. (2011, Foot and Ankle Surgery) documented 53% lower radiation dose area product in foot and ankle surgery.[24]
  • FESSH (2016, J. Hand Surgery European Volume) reported surgeons receive less than 3% of annual radiation limits during intraoperative hand and wrist fluoroscopy.[36]
  • A prospective series of 1,064 consecutive foot and ankle procedures confirmed all radiation exposures remained below international occupational and patient dose limits throughout daily clinical use.[22]
  • Standard radiation protection practices apply, including lead aprons, thyroid shields, leaded gloves, and the ALARA principle (As Low As Reasonably Achievable).

Origin

[edit]

The Mini C-arm was pioneered by American entrepreneur Larry S. Grossman, as reported in Crain's Chicago Business, which profiled him in an article headlined "Picture Brightens for Pioneer in X-ray Systems Technology."[37] According to contemporaneous reports in the Chicago Sun-Times, Larry S. Grossman founded HealthMate, Inc. in 1982 to adapt NASA-derived low-intensity X-ray imaging (LIXI) technology into a mains-powered fluoroscopic instrument for medical use.[38][39]

U.S. Patent 4,142,101, titled "Low intensity X-ray and gamma-ray imaging device," issued to Lo I Yin on February 27, 1979 and assigned to NASA, describes a compact, portable imaging device. This invention formed the basis for the Lixiscope (Low Intensity X-ray Imaging Scope) technology that the Mini C-arm was built upon.[40]

Under a consulting agreement between HealthMate, Inc. and the QTR Consulting Group,[38][39][37] a second patent was issued in 1985, which was assigned to NASA, for a proprietary high-voltage power supply designed by Arthur P. Ruitberg and Kenneth M. Young.[41]

Grossman devised the concept of replacing the radioactive isotope used in the patented Lixiscope with a micro-focused X-ray tube and adding a high-voltage power supply to that device to make it controllable. As reported in NASA's Spinoff Magazine, "HealthMate replaced the isotope penetrating source with a variable power x-ray tube".[42][43] As described in the Chicago Sun-Times article by Susan Chandler, dated June 1985, "The main difference between the Lixiscope and the FluoroScan is the power source of its X-rays. The FluoroScan uses an x-ray generator."[38][44]

The FDA's Center for Devices and Radiological Health granted marketing clearance to HealthMate, Inc. for the FluoroScan system in June 1985.[1]

History

[edit]

HealthMate introduced the FluoroScan Mini C-arm in the United States in 1985.[38][39] Following a Chapter 11 reorganization in 1989,[45] HealthMate was renamed FluoroScan Imaging Systems, Inc.

A second early mini C-arm system, the XiTec XiScan, also became available in the early 1990s. The XiScan technology has since been continued by FM Control of Vitoria-Gasteiz, Spain, whose XiScan Series 5000 is a European-manufactured mini C-arm available in European and international markets.[46][47]

FluoroScan Imaging Systems, Inc. was acquired by Hologic, Inc. (NASDAQ: HOLX), in 1996.[48][49] Under Hologic, the product line was rebranded as the Fluoroscan Insight.[50] Successive generations include the Premier, Premier Encore, InSight, InSight 2, and InSight FD. Hologic announced the end-of-sale and end-of-life for the Fluoroscan InSight FD mini C-arm, effective September 30, 2025.[51]

In 2004, OrthoScan, Inc. was established. OrthoScan introduced the OrthoScan FD with a flat-panel detector, offering 2K x 1.5K matrix resolution versus the 1K x 1K standard of image intensifier systems.[52][53] OrthoScan subsequently introduced the FD Pulse, which included a pulsed fluoroscopy option.[54] In September 2011, OrthoScan was acquired by German private investment firm Aton GmbH, which also held a majority stake in Ziehm Imaging.[55] Aton later merged the two C-arm companies and renamed the combined entity Ziehm-OrthoScan. They subsequently produced the TAU Mini C-arm brand.[56]

OEC Medical Systems, Inc. (Salt Lake City, Utah) entered the Mini C-arm market with its Mini 6600 and MiniView 6800 models. OEC was acquired by GE Medical Systems in November 1999 and the product line continued under the GE OEC brand.[57][58]

Turner Imaging Systems (Orem, Utah) developed the SMART-C, a battery-powered, portable Mini C-arm that received FDA 510(k) clearance in October 2019 and weighs only 16 pounds.[59]

Regulatory Status

[edit]

In the United States, Mini C-arm fluoroscopy systems are regulated by the Food and Drug Administration (FDA) as Class II medical devices under 21 CFR Part 892 (Radiology Devices), requiring 510(k) clearance prior to marketing. Radiation-emitting electronic products are additionally subject to performance standards under 21 CFR Part 1020. In the United States, Mini C-arms may be operated by licensed physicians, subject to state radiation control regulations. This physician operable status makes the Mini C-arm distinct from standard C-arms, which typically require a radiographer.[2][60][61]

See also

[edit]

References

[edit]
  1. 1 2 "510(k) Premarket Notification K843920". U.S. Food and Drug Administration, Center for Devices and Radiological Health. June 1985. Retrieved 2026-05-21.
  2. 1 2 3 "C-Arm Technology Update". Radiology Today. 11 (2): 22. 2010.
  3. ↑ Hasham S, Burke FD, Evans SJ, Arundell MK, Quinton DN (2007). "An Audit of the Safe Use of the Mini C-Arm Image Intensifier in the Out-Patient Setting". Journal of Hand Surgery. 32 (5): 576–579. doi:10.1016/J.JHSE.2007.03.013. PMID 17950224.
  4. 1 2 3 Swindells MG, O'Brien CM, Armstrong DJ, Arundell MK (2011). "The use of the Mini C-arm in the outpatient setting: Evolving practice". Journal of Plastic, Reconstructive & Aesthetic Surgery. 64 (5): 688–689. doi:10.1016/j.bjps.2010.08.012. PMID 20870477.
  5. ↑ US 10076302, Franklin J; Kolovich G & Ruff E et al., "Imaging systems and methods", issued September 18, 2018, assigned to Micro C, LLC
  6. ↑ van Rappard JR, Hummel WA, de Jong T, Mouës CM (2019). "A Comparison of Image Quality and Radiation Exposure Between the Mini C-Arm and the Standard C-Arm". HAND. 14 (6): 765–769. doi:10.1177/1558944718770210. PMC 6900691. PMID 29661071.
  7. ↑ Lagotzki S, Iftikhar A, Friebe M, Boese A (2018). "Flexible interventional imaging system based on miniaturized X-ray tubes (FlexScan)". Current Directions in Biomedical Engineering. 4 (1): 63–66. doi:10.1515/cdbme-2018-0016.
  8. 1 2 "FluoroScan Mini C-arm unit". Health Devices. 24 (2): 44–70. 1995. PMID 7737880.
  9. 1 2 3 Gehrke JC, Mellenberg DE Jr, Donnelly RE, Johnson KA (1993). "The Fluoroscan Imaging System in Foot and Ankle Surgery". Foot & Ankle International. 14 (9): 545–549. doi:10.1177/107110079301400912. PMID 8314193.
  10. ↑ Naidu J, Botchu R, Iyengar KP (2024). "Safe usage of Mini C-arm in operating room environment". Journal of Perioperative Practice. 34 (9): 260–263. doi:10.1177/17504589241228138. PMID 38462719.
  11. 1 2 Chan KW, McAdams TR (2004). "Central screw placement in percutaneous screw scaphoid fixation: a cadaveric comparison of proximal and distal techniques". Journal of Hand Surgery (American Volume). 29 (1): 74–79. doi:10.1016/j.jhsa.2003.09.002. PMID 14751108.
  12. 1 2 Hsu RY, Lareau CR, Kim JS, et al. (2014). "Effect of C-Arm Position on Radiation Exposure During Fixation of Pediatric Supracondylar Fractures of the Humerus". JBJS. 96 (15): e129. doi:10.2106/JBJS.M.01076. PMID 25100782.
  13. 1 2 Lee SM, Orlinsky M, Chan LS (1994). "Safety and Effectiveness of Portable Fluoroscopy in the Emergency Department for the Management of Distal Extremity Fractures". Annals of Emergency Medicine. 24 (4): 725–730. doi:10.1016/S0196-0644(94)70284-5. PMID 8092602.
  14. ↑ Benitez, AC; Brook, K (2025). "Mini C-arm: Are the Risks Truly 'Mini' to Theatre Practitioners?". British Journal of Perioperative Practice 17504589251388271. doi:10.1177/17504589251388271. PMID 41194577.
  15. ↑ Ammari T, et al. (2021). "Establishing local diagnostic reference levels for Mini C-arm use in upper limb surgery". The Surgeon. 19 (6): e338–e343. doi:10.1016/j.surge.2020.08.007. PMID 32994124.
  16. ↑ Protas JM, Jackson WT (1980). "Evaluating carpal instabilities with fluoroscopy". American Journal of Roentgenology. 135 (1): 137–140. doi:10.2214/ajr.135.1.137. PMID 6771978.
  17. ↑ Sulkers GS, Strackee SD, Schep NW, Maas M (2018). "Wrist cineradiography: a protocol for diagnosing carpal instability". Journal of Hand Surgery (European Volume). 43 (4): 418–425. doi:10.1177/1753193417694820. PMC 5791518. PMID 28488457.
  18. ↑ Wolf JM, Weiss AP (1999). "Portable mini-fluoroscopy improves operative efficiency in hand surgery". Journal of Hand Surgery (American Volume). 24 (1): 182–184. doi:10.1053/jhsu.1999.jhsu24a0182. PMID 10048535.
  19. ↑ Kesler K, Buckwalter JA (2022). "Efficiency Benefits of Live Fluoroscopy in Hand Clinics". Iowa Orthopaedic Journal. 42 (2): 118–121. PMC 9769344. PMID 36601224.
  20. ↑ Ozdemir E, Aynardi M (2024). "Minimally Invasive Bunion Surgery for Hallux Valgus: A Surgical Technique". Lower Extremity Review.
  21. ↑ Flaherty A, Chen J (2024). "Minimally Invasive Chevron Akin Osteotomy for Hallux Valgus Correction". JBJS Essential Surgical Techniques. 14 (1) e22.00021. doi:10.2106/JBJS.ST.22.00021. PMC 10805425. PMID 38268770.
  22. 1 2 "Prospective analysis of intraoperative radiation dose in foot and ankle surgery using mini-C-arm: 1,064 procedures". Orthopaedics & Traumatology: Surgery & Research. 105 (3): 503. 2019.
  23. ↑ Gangopadhyay S, Scammell BE (2009). "Optimising use of the mini C-arm in foot and ankle surgery". Foot and Ankle Surgery. 15 (3): 139–143. doi:10.1016/j.fas.2008.10.004. PMID 19635421.
  24. 1 2 Dawe E, et al. (2011). "A comparative study of radiation dose and screening time between mini C-arm and standard fluoroscopy in elective foot and ankle surgery". Foot and Ankle Surgery. 17 (1): 33–36. doi:10.1016/j.fas.2010.01.001. PMID 21276563.
  25. ↑ Gendelberg D, Hennrikus W, Slough J, King S (2016). "A Radiation Safety Training Program Results in Reduced Radiation Exposure for Orthopaedic Residents Using the Mini C-arm". Clinical Orthopaedics and Related Research. 474 (2): 578–584. doi:10.1007/s11999-015-4631-0. PMC 4709301. PMID 26566977.
  26. ↑ Fanelli MG, Hennrikus WL, Slough Hill JM, Armstrong DG, King SH (2016). "The Mini C-arm Adds Quality and Efficiency to the Pediatric Orthopedic Outpatient Clinic". Journal of Pediatric Orthopaedics. 39 (6): e1097–e1099. doi:10.3928/01477447-20160808-01. PMID 27504650.
  27. ↑ "Procedural Use of a Mini C-arm in the Emergency Department". Academic Life in Emergency Medicine (ALiEM). December 31, 2025.
  28. ↑ Kumar R, Muzzammil M, Maqsood K, et al. (2017). "Role of Mini C-arm in Orthopedic Emergency Department". Journal of Trauma and Critical Care. 1 (2): 34–37.
  29. ↑ Odom MR (2020). "Foreign Bodies in the Skin: Evaluation and Management". American Family Physician. 101 (12): 740–747. PMID 32538598.
  30. ↑ Lee MC, Stone NE, Ritting AW, et al. (2011). "Mini-C-Arm Fluoroscopy for Emergency-Department Reduction of Pediatric Forearm Fractures". Journal of Bone and Joint Surgery (Am.). 93 (15): 1442–1447. doi:10.2106/JBJS.J.01052. PMID 21915550.
  31. ↑ Nagy M, Ashwood N, Abouelela A, Suryawanshi S, Sidhu GA, Kitsis C (2022). "The Use of Fluoroscan in Hand Clinic During the COVID Pandemic to Optimise Conservative Treatment". Cureus. 14 (9) e29494. doi:10.7759/cureus.29494. PMC 9595256. PMID 36312667.
  32. 1 2 3 4 5 US 6,234,672, "Miniature C-arm apparatus with C-arm mounted controls" Fig. 3(A-D)
  33. ↑ Nickoloff EL (2011). "AAPM/RSNA Physics Tutorial for Residents: Physics of Flat-Panel Fluoroscopy Systems—Survey of Modern Fluoroscopy Imaging: Flat-Panel Detectors versus Image Intensifiers and More". RadioGraphics. 31 (2): 591–602. doi:10.1148/rg.312105185. PMID 21415199.
  34. ↑ Athwal GS, Bueno RA, Wolfe SW (2005). "Radiation Exposure in Hand Surgery: Mini Versus Standard C-Arm". Journal of Hand Surgery (American Volume). 30 (6): 1310–1316. doi:10.1016/j.jhsa.2005.06.023. PMID 16344194.
  35. ↑ Singer G (2005). "Radiation Exposure to the Hands from Mini C-arm Fluoroscopy". Journal of Hand Surgery (American Volume). 30 (4): 795–797. doi:10.1016/j.jhsa.2005.01.007. PMID 16039374.
  36. ↑ "FESSH Abstracts 2016 - A-0021: Hand and body radiation exposure during mini C-arm fluoroscopy". Journal of Hand Surgery European Volume. 2016. doi:10.1177/1753193416644553.
  37. 1 2 Bell, Bonnie (September 16, 1995). "Picture Brightens for Pioneer in X-ray Systems Technology". Crain's Chicago Business.
  38. 1 2 3 4 Chandler, Susan (June 23, 1985). "New Firm Banks on Technology and People". Chicago Sun-Times.
  39. 1 2 3 Darby, Edwin (October 16, 1985). "2 Hope FluoroScan Healthy Future". Chicago Sun-Times.
  40. ↑ US 4,142,101, "Low intensity X-ray and gamma-ray imaging device", issued February 27, 1979, assigned to NASA
  41. ↑ US 4,517,472, "High voltage power supply", issued May 14, 1985, assigned to NASA
  42. ↑ "X-Ray Imaging System (FluoroScan)". NASA Spinoff. 2026.
  43. ↑ "X-Ray Imaging System". NASA Technical Reports Server. January 1986.
  44. ↑ "CEO Interview: Larry S. Grossman, Chm & CEO FluoroScan Imaging Systems, Inc". The Wall Street Transcript. December 18, 1995.
  45. ↑ Gornstein, Leslie (September 24, 1994). "IPO Provides X-ray Equipment Firm a Clearer Growth Picture". Crain's Chicago Business.
  46. ↑ "XiTec XiScan 1000 mini C-arm unit". Health Devices. 25 (11): 413–425. 1996. PMID 8913780.
  47. ↑ "XiScan Series 5000 Mini C-arm". FM Control (Vitoria-Gasteiz, Spain).
  48. ↑ "Hologic Inc. (company history and FluoroScan acquisition)". Axis Imaging News. 2006.
  49. ↑ "Agreement and Plan of Merger (Hologic, Inc. and FluoroScan Imaging Systems, Inc.), Form S-4 Registration Statement". U.S. Securities and Exchange Commission, EDGAR. July 18, 1996.
  50. ↑ "Annual Report on Form 10-K for Fiscal Year 2018". Hologic, Inc., via U.S. Securities and Exchange Commission EDGAR. 2018.
  51. ↑ "Annual Report on Form 10-K for Fiscal Year Ended September 28, 2024". Hologic, Inc., via U.S. Securities and Exchange Commission EDGAR. 2024.
  52. ↑ "Orthoscan FD Digital Mini C-arm Review". Block Imaging (independent equipment evaluation). 2024.
  53. ↑ "510(k) Premarket Notification K133174". U.S. Food and Drug Administration, Center for Devices and Radiological Health. March 28, 2014. Retrieved 2026-05-21.
  54. ↑ "510(k) Premarket Notification K161976". U.S. Food and Drug Administration, Center for Devices and Radiological Health. October 6, 2016. Retrieved 2026-05-21.
  55. ↑ "ATON Acquires OrthoScan, Inc". PR Newswire. September 27, 2011.
  56. ↑ "OrthoScan, Inc. launches new TAU family of mini C-arms - the first mini C-arm designed for use with pediatric patients". Ortho Spine News. 2019.
  57. ↑ "GE Makes Bid for OEC Medical to Broaden Interventional Offerings". Diagnostic Imaging.
  58. ↑ "GE Medical Systems". Axis Imaging News. 1999.
  59. ↑ "510(k) Premarket Notification K190024". U.S. Food and Drug Administration, Center for Devices and Radiological Health. September 27, 2019. Retrieved 2026-05-21.
  60. ↑ Daner WE 3rd, Ryan PM, Domson GF, Sima AP, Isaacs JE (2021). "Quality of Mini C-Arm Imaging in Post-Reduction Evaluation of Distal Radius Fractures". Osteology. 1 (3): 105–111. doi:10.3390/osteology1030011.
  61. ↑ Groover ME, Bamberger HB, Evans M, Gazaille RE, Hinkley A, Gerow E (2019). "The Effect of Metal Instrumentation on Patient and Surgical Team Scatter Radiation Exposure Using Mini C-Arm in a Simulated Forearm Fracture Fixation Model". J Am Acad Orthop Surg Glob Res Rev. 3 (11): e045. doi:10.5435/JAAOSGlobal-D-18-00089. PMC 6917351. PMID 31858073.
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