26 Risk classification list of medical devices pertaining to Oncology 2026-Jan-02 308 KB
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Appendix A File No.: MED-16014(12)/1/2024-eoffice Notice Classification of Medical Devices Pertaining to Oncology
S. No. Device name Intended use Risk Classification 1 Accelerator system chair A component of a therapeutic accelerator system intended to support and position a seated patient during radiation therapy treatments involving the use of either a medical linear accelerator or non-linear accelerator. Class C 2 Accelerator system quality assurance device An instrument specifically intended to be used to check the calibration and performance of linear and non-linear medical accelerator systems used for radiation therapy applications, for quality assurance (QA) purposes. Class C 3 Alternating electric field antimitotic cancer treatment system An assembly of portable devices intended to apply low-intensity, intermediate-frequency (100-300 kHz) alternating electric fields to treat certain forms of recurrent or newly-diagnosed cancer; typically glioblastoma multiforme (GBM) [malignant brain tumour]. Class D 4 Alternating electric field antimitotic cancer treatment system transducer array A head-worn component of an alternating electric field cancer treatment system intended to convert intermediate-frequency (100-300 kHz) alternating electric current to low-intensity alternating electric fields to treat certain forms of recurrent or newly- diagnosed cancer; typically glioblastoma multiforme (GBM) [malignant brain tumour]. Class D 5 Alternating electric field antimitotic cancer treatment system generator A portable, battery-powered component of an alternating electric field cancer treatment system intended to generate intermediate-frequency (100- 300 kHz) alternating electric current to treat certain forms of recurrent or newly-diagnosed cancer; typically glioblastoma multiforme (GBM) [malignant brain tumour]. Class C 6 Anorectal brachytherapy system applicator, remote-afterloading A remote afterloading brachytherapy applicator specifically intended for use in radiation therapy treatments of the rectum and/or anus. Class C 7 Anorectal brachytherapy system applicator, manual A manual brachytherapy applicator specifically intended to be used in radiation therapy treatments of the rectum and/or anus. Class C 8 Balloon kyphoplasty kit A collection of sterile surgical instruments and devices intended to be used for the reduction of vertebral compression fractures (VCFs) caused by trauma, cancer, or osteoporosis during a minimally invasive procedure commonly known as balloon kyphoplasty. It typically consists of a bone access needle, an osteo introducer, an inflation syringe, and the inflatable bone tamp (implantable devices such as fillers/cements not included). This is a single-use device. Class B
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9
Bladder instillation buffer solution
A sterile buffer solution intended to be used
exclusively for bladder instillation to help create an
optimal environment necessary for the effective
treatment of superficial bladder cancer with a
chemotherapy agent. This does not include
pharmaceuticals.
Class B
10
Brachytherapy source spacer
A sterile, bioabsorbable device intended to separate
radioactive sources of the seed type that are
permanently implanted in close proximity to a
selected localized tumour, to increase the
distribution of radioactivity to the tumour.
Class D
11
Brachytherapy system remote-
afterloading operator console
A mains electricity (AC-powered) component of a
remote- afterloading brachytherapy system intended
to function as the primary control panel for the
remote afterloader. It may also be intended to
interface with other devices (e.g., radiation therapy
treatment planning computer) as part of a picture
archiving and communication system (PACS).
Class C
12
Breast 3-D infrared
imaging/vascular analysis system
An assembly of mains electricity (AC-powered)
devices intended for three-dimensional (3-D) breast
imaging and breast vascular analysis, typically used
with mammography screening to perform a breast
cancer risk examination.
Class C
13
Breast brachytherapy system
applicator, remote-afterloading
A sterile, remote-afterloading brachytherapy
applicator specifically intended for use in radiation
therapy treatments of the breast.This is a single-use
device.
Class C
14
Breast transilluminator
A mains electricity (AC-powered) transilluminating
device intended to visualize translucent breast
tissue for the diagnosis of cancer, or other
conditions, diseases or abnormalities using low
intensity emissions of visible light and near-infrared
radiation. This device may also be known as a
diaphanoscope.
Class B
15
Breast ultrasound imaging
system, intracorporeal
An assembly of mains electricity (AC-powered)
devices intended for intracorporeal
(endosonography or endoscopic) ultrasound
imaging procedures involving the breast.
Class C
16
Breast ultrasound imaging
system, extracorporeal
An assembly of mains electricity (AC-powered)
devices intended for extracorporeal ultrasound
imaging procedures involving the breast.
Class B
17
Intraoperative cancer diagnostic
probe
An active device intended for detection of breast
cancer lesions of various subtypes intraoperatively
by checking for tumour side margins.
Class C
18
Capsular tension ring
A circular band intended to be used to enhance the
mechanical stability of a subluxated crystalline lens
capsule in the presence of weak or absent
supporting zonules.
Class C
19
Cervical cone knife, single-use
A surgical, manually-operated, instrument that is
inserted into the vagina and intended for excising a
sample of abnormal tissue, e.g., indicated by the
presence of precancerous changes, from the cervix.
This is a sterile, single-use device.
Class A
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20 Cervical cytology scraper, single- use A hand-held, manual surgical instrument intended to scrape and retrieve cytological material from the surface of the cervix (neck of the uterus) or vaginal area for pathological examination and diagnosis, often for the detection of cervical cancer. This is a sterile, single-use device. Class A 21 Colonic cytology sampling set A collection of devices intended to collect exfoliated colonic cells (colonocytes) from the surface of human rectal mucosa for colorectal cancer investigation and/or patient screening. It typically includes a proctoscope with obturator and a hand- operated, syringe-type, air pump with a sampling balloon. This is a single-use device. Class B 22 Computer vision/Machine learning-aided software application for cancer detection A standalone software application intended to be used to scan radiological images (X-ray, CT scan, etc.) in order to screen/diagnose for cancerous tissues using machine learning-based training models and computer vision. Class C 23 Coronary artery brachytherapy system applicator, manual- afterloading A sterile flexible tube intended to deliver/remove radiation therapy sources into/from a coronary artery, typically into the lumen of an implanted stent, as part of a manual-afterloading brachytherapy system. This is a single-use device. Class D 24 Cryosurgical set/ Cryoablation system A collection of sterile, disposable devices intended for use in conjunction with a cryosurgical unit as well as monitoring and other devices to perform a surgical technique that involves freezing a targeted area of tissue to damage and destroy cancer cells in the unwanted portions. Class C 25 Electrocancer therapy system An assembly of devices intended for the treatment of tumours and the destruction of cancerous cells using low-voltage direct current of small intensity delivered via electrodes placed across the affected body area. Class C 26 Electronic clinical breast examination system A portable assembly of devices intended to electronically measure, map, document and store information about breast lesions/masses with regard to shape, size, location, consistency/relative hardness during a clinical breast examination (CBE). Class B 27 Electroporation therapy system A mobile assembly of devices intended to apply electrical impulses to the tissue to enable electroporation for the delivery of chemotherapeutic or genetic (DNA/RNA) materials. This does not include pharmaceuticals or biological materials. Class C 28 Electroporation therapy system endoscopic applicator A sterile, patient-contact component of an electroporation therapy system intended to fit onto the distal tip of an endoscope and connect to an electroporation therapy system generator to deliver electrical impulses to tissues during endoscopy as part of electroporation therapy. Class C
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Embolization particle,
bioabsorbable
A bioabsorbable, implantable bead/microsphere
intended to be used to temporarily occlude an artery
supplying hyperplastic/neoplastic tissue in a variety
of anatomies (e.g., liver, lung, breast, bladder,
uterus, head or neck); it does not include a
pharmaceutical agent. It is typically available as an
injectable solution containing numerous
microspheres [e.g., degradable starch microspheres
(DSM)].
Class D
30
Embolization particle, non-
bioabsorbable
A non-bioabsorbable, implantable bead/microsphere
intended to be introduced into the peripheral
vasculature during an interventional radiology
procedure to treat hypervascularized tumours and
arteriovenous malformation in a variety of anatomies
(e.g., head, neck, spine, liver, genitourinary tract,
uterus, gastrointestinal, limbs and lungs). It is
typically available as injectable solution containing
numerous microspheres [e.g., compressible
polyvinyl alcohol (PVA) microspheres] intended to
permanently obstruct blood flow to the
tumour/malformation.
Class D
31
Endocervical aspirator
A collection of devices intended to remove
superficial tissue from the mucous membrane lining
the cervical canal (endometrium) through manually-
powered suction. It typically includes a slender
endocervical curette, a syringe, a bulb, and a
pipette.
Class B
32
Externally-propelled flexible video
colonoscope
A non-sterile endoscope intended for the visual
examination of the entire adult colon [lower
gastrointestinal (GI) tract] to aid in screening and
detection of colorectal cancer and other diseases of
the lower GI tract. This is a single-use device.
Class B
33
Extravascular-circulation
hyperthermia system
An assembly of devices intended to produce and
control heated fluids circulated within a vessel
applied to the body (e.g., vest, mattress, jacket,
band, pad, body wrap, catheter, probe) for systemic
or localized heating to treat malignant tumours,
benign growths, or other disease-related conditions.
Class B
34
Extravascular-circulation
hyperthermia system applicator,
extracorporeal
A vessel applied to the outside of the body (e.g., in
the form of a jacket, vest, body wrap, cushion,
blanket, or mattress) that incorporates tubing
through which heated fluids are circulated for
systemic or localized heating to treat malignant
tumours, benign growths, or other disease-related
conditions. The applicator typically includes a
thermometry component that monitors the
temperature of the applicator during operation. This
is a reusable device.
Class A
35
Extravascular-circulation
hyperthermia system applicator,
intracorporeal
A component of a hyperthermia system that typically
consists of catheter-enclosed tubing which is
intended to be introduced into the body either
manually or endoscopically for localized heating to
treat malignant tumours, benign growths, or other
disease-related conditions. This may include a
thermometry component that monitors the
temperature of the applicator during operation. This
is a single-use device.
Class B
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Facial prosthesis
An externally-applied device intended to be used as
an artificial substitute for parts or sections of the
face [e.g., nose, eye(s), eye brows, upper lip] to help
restore facial appearance. It may be held in position
with magnets or screw-like implants embedded into
the patient's facial bone. This includes implantable
screws.
Class C
37
Fixed-aperture therapeutic x-ray
system collimator
A non-automated, x-ray beam-limiting device that is
a component of a therapeutic x-ray system and
whose opening size/length/shutter assembly is fixed.
It is intended for use in radiation therapy
applications to limit the effects of scattered radiation
and to protect the patient by limiting or eliminating
exposure to non-target body areas during treatment.
This device is specifically designed for use with an
x-ray simulation or therapeutic x-ray system.
Class C
38
Flexible fibreoptic bronchoscope
An endoscope intended for the visual examination
and treatment of the trachea, bronchi, and lungs. It
is inserted through the mouth or nose during
bronchoscopy. This device may allow operator to
take biopsies and samples of secretions. This is a
reusable device.
Class B
39
Flexible fibreoptic
mediastinoscope
A surgically-invasive endoscope with a flexible
inserted portion intended for the visual examination
and treatment of the mediastinum (the intrapleural
space located behind the sternum). This device is
commonly used to examine structures such as
lymph nodes during a staging evaluation of lung
cancer, or to establish the diagnosis of a tumour that
is localized to the mediastinum. This is a reusable
device.
Class B
40
Flexible ultrasound bronchoscope
An endoscope intended to be used in conjunction
with an ultrasound probe for the visual examination
and treatment of the trachea, bronchi, and lungs.
This device may allow biopsies and access to
samples of secretions. This is a reusable device.
Class B
41
Flexible video bronchoscope
An endoscope intended for endoscopic procedures
of the airways and tracheobronchial tree (i.e.,
bronchoscopy). This is a reusable device.
Class B
42
General-purpose infusion pump,
mechanical, reusable
A non-electric, mechanically-powered (e.g., a spring
mechanism) device intended for the continuous or
intermittent infusion of medication, typically for
antibiotic therapy, chemotherapy, or pain
management by intravenous (IV), subcutaneous,
intramuscular, or epidural routes. It may be used for
patient-controlled analgesia (PCA), and may include
mechanical indicators for flow and fluid level status.
This is a reusable device.
Class C
43
General-purpose infusion pump,
mechanical, single-use
A portable, non-electric, mechanically-powered
device intended for use by healthcare professionals
for dispensing a single dose of fluid medication (e.g.,
for antibiotic therapy, chemotherapy, analgesia).
This is a single-use device.
Class C
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Hyperthermia system
temperature probe
A device (a probe) intended to be used exclusively
to monitor tissue or body temperature during
hyperthermia treatments. Depending on the kind of
hyperthermia system it is used with, e.g., ultrasound,
radio-frequency (RF) or microwave, etc. This is a
reusable device.
Class C
45
Implantable Vascular
port/catheter
A fully-implantable device assembly intended to
provide access to arteries/veins (excludes coronary
and intracerebral circulation) for infusion (e.g.,
chemotherapeutic agents, blood transfusions)
and/or drainage (e.g., blood).
Class C
46
Intracavitary-circulation
hyperthermia system
An assembly of electrically-powered devices
intended to continuously lavage body cavities (e.g.,
pleural cavity, peritoneal cavity, bladder lumen) with
warmed fluids/chemotherapeutic agents to raise the
local temperature and/or enhance the effect of
drugs, typically in the treatment of malignancy.
Class C
47
Intraoperative gamma radiation
detection system probe control
unit
An electrically-powered component of an
intraoperative gamma radiation detection system
intended to detect and quantify gamma radiation
emitted from previously-administered
radiopharmaceuticals (e.g., localized in sentinel
lymph nodes), in conjunction with a dedicated
invasive probe (not included). It typically consists of
a console with display, audiovisual alarms, and
controls.
Class C
48
Intraoperative gamma radiation
detection system probe
An electrically-powered, invasive component of an
intraoperative gamma radiation detection system
intended to be introduced into the body during a
surgical procedure to detect and quantify gamma
radiation emitted from previously-administered
radiopharmaceuticals (e.g., localized in sentinel
lymph nodes), in conjunction with a dedicated
control unit (not included).
Class C
49
Intraoperative tumour margin
fluorescence imaging system
A set of devices intended for fluorescent imaging of
an area within the body using the excitation of an
injected fluorophore (e.g., pegulicianine). It is
typically used for intraoperative detection of residual
cancerous tissue in the resection cavity following
removal of the primary specimen during surgical
procedure (e.g., lumpectomy). This is a reusable
device.
Class C
50
Intravascular/intracavitary-
circulation hyperthermia system
An assembly of devices intended to circulate
warmed fluids or autologous blood through the
vasculature or cavity of a targeted anatomical area
(e.g., peritoneal/pleural cavities, thorax, abdomen,
section of a limb) to treat cancer. It heats the
blood/fluids to temperatures up to 43 °C to enhance
the effect of drugs [e.g., for intraperitoneal
hyperthermic chemotherapy (IPHC)] and help
destroy cancer cells.
Class C
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Intravascular/intracavitary-
circulation hyperthermia system
set (Kit for hyperthermic
perfusion)
A collection of non-powered, sterile devices
intended for use with an intravascular/intracavitary-
circulation hyperthermia system for the circulation of
blood/fluid between the patient and the system's
extracorporeal circuit during cancer therapy. It
typically consists of drains/catheters, tubing,
connectors, manual clamps, temperature sensors,
and hard or soft reservoirs. This is a single-use
device.
Class B
52
Microwave ablation system
An assembly of devices consisting of a generator
and a probe (and other accessories) intended to
generate and transmit microwave energy for
localized non-vascular soft-tissue ablation, typically
to treat tumours, hydatid cysts and/or menorrhagia.It
is intended to be used in percutaneous,
laparoscopic, natural orifice or open surgery
procedures to ablate tissue typically in the liver,
lung, pancreas, kidney, and uterus (e.g.,
endometrial ablation).
Class C
53
Microwave ablation system
generator
A mains electricity (AC-powered) device intended to
generate microwave energy for localized non-
vascular soft-tissue ablation, typically to treat
tumours, hydatid cysts and/or menorrhagia
(excludes cerebral and coronary tissues). It is
intended to be used in percutaneous, laparoscopic,
natural orifice or open surgery procedures to ablate
tissue typically in the liver, lung, pancreas, kidney,
and uterus (e.g., endometrial ablation).
Class C
54
Microwave ablation system
probe/microwave ablation
antenna
A hand-held surgical instrument intended to connect
to a microwave ablation system generator to deliver
microwaves to a targeted operative site for localized
soft-tissue ablation, typically to treat tumours,
hydatid cysts and/or menorrhagia. The device is
intended to be used in percutaneous, endoscopic
[e.g., gastroscopic, laparoscopic], natural orifice or
open surgery procedures to ablate tissues (e.g.,
endometrial ablation).
Class C
55
Microwave hyperthermia system
A mains electricity (AC-powered) device assembly
intended for controlled heating (i.e., temperatures
above 43° Celsius) of the body using microwaves,
for the treatment of malignant or benign tumours or
other disease conditions [e.g., benign prostatic
hyperplasia (BPH), prostatitis]. It may be intended
for both whole-body and localized heating of
tissues/organs.
Class C
56
Microwave hyperthermia system
applicator, extracorporeal
A component of a microwave hyperthermia system
intended to direct and deliver microwave energy
used to produce a systemic or local heating effect.
Class C
57
Microwave hyperthermia system
applicator, intracorporeal
A component of a microwave hyperthermia system
intended to be placed inside the body to deliver
microwave energy to produce a systemic or local
heating effect. It is also referred to as an interstitial
applicator or probe
Class C
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Microwave/electrosurgical system
generator
An electrically-powered component of a microwave
ablation/electrosurgical system intended to generate
both: 1) radio-frequency (RF) electrical current; and
2) microwave energy for subsequent cutting,
coagulation, and ablation of soft tissues during an
endoscopic or open surgical procedure; it is not
dedicated to focal ablation of specific tissues. It is
not intended for inert gas electrosurgery.
Class C
59
Multi-modality hyperthermia
system
A mains electricity (AC-powered) device assembly
intended for controlled heating (i.e., temperatures
above 43° Celsius) of the body using multiple
energy sources, for the treatment of malignant or
benign tumours, or other disease conditions
(excludes cerebral and coronary tissues). It is
intended to achieve whole-body and localized
heating of tissues using two or more energy sources
[e.g., ultrasound, radio-frequency (RF), microwave,
circulating heated fluid].
Class C
60
Photopheresis system blood set
A collection of devices intended for use as part of a
photopheresis system for extracorporeal
photoimmunetherapy to treat immune disorders,
especially cutaneous T-cell lymphoma (CTCL). This
is a sterile, single-use device.
Class C
61
Photopheresis system lamp
assembly
An assembly of ultraviolet A (UVA)-emitting tubular
strip lights that is an exchangeable component of a
photopheresis system, and intended to irradiate
blood components during extracorporeal
photoimmunetherapy to treat immune disorders,
especially cutaneous T-cell lymphoma (CTCL).
Class C
62
Polymer-metal oesophageal stent
A non-bioabsorbable, expandable, tubular device
intended to be implanted into the oesophagus to
maintain luminal patency in strictures and prevent
tumour in-growth. It may also be intended to seal
oesophageal fistulas, reduce acute bleeding from
oesophageal varices, and/or to treat other lesions
causing oesophageal leakage (e.g., anastomotic).
Disposable devices intended for introduction may be
included.
Class C
63
Radiation therapy digital imager
An automated device that is typically mounted on
the gantry of a linear accelerator and intended to
produce digital images of x-rayed anatomical
landmarks to guide radiation treatment (e.g.,
tracking/targeting tumours). The device may be a
digital imaging panel (e.g., of silicon) on robotic
arms; it may also have an x-ray source to generate
higher quality images.
Class C
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Real-time position management
respiratory gating system,
optical/Respiratory gating system,
radiation procedure
An assembly of electronic devices intended to track
the respiratory pattern of a patient by means of
optical technology to correlate tumour position with
the respiratory cycle during radiation treatment
planning, radiotherapy, computed tomography (CT)
imaging, or other radiation procedures. It provides
real-time position management (RPM) and involves
optical-based tracking (e.g., video, infrared, laser) of
the respiratory cycle to enable irradiation control
during the procedure. It may include a tracking
camera connected to a dedicated personal
computer workstation and a reflective chest
wall/abdominal marker.
Class C
65
Robotic Guidance system for
image-Guided procedures
It is an accessory to an imaging system (CT, CT-
PET) intended for the spatial positioning and
orientation of an instrument guide. The device is not
intended to make any contact with the patient.
Class B
66
Scalp cooling system, hair loss
An assembly of electrically-powered devices
intended to reduce scalp hair loss associated with
intravenous chemotherapy treatment by cooling the
scalp to cause vasoconstriction and reduction of
chemotherapy drug uptake by the follicular cells. An
insulating cap (e.g., neoprene) may be worn over
the cooling cap to secure it and prevent
condensation.
Class B
67
Stereotactic radiosurgery system
for central nervous system (CNS)
A set of devices intended to use very precise beams
of gamma rays to treat an area of disease (lesion) or
growth (tumour), especially in the brain, upper spine
and in certain cases, vascular abnormalities.
Class D
68
Teletherapy radionuclide system
table, powered
A device that is a component of a teletherapy
radionuclide system (commonly known as a cobalt
therapy machine) specifically intended to position
and support a patient during treatments
administered using a therapeutic radionuclide
teletherapy system (e.g., a Cobalt-60 teletherapy
system). It can be a stationary or mobile unit, or
incorporated as an integral component of a
radionuclide teletherapy system or gantry
configuration.
Class B
69
Teletherapy radionuclide system,
conventional/Cobalt therapy
machine
A stationary assembly of devices intended to deliver
a therapeutic radiation dose to an anatomical region
from a single external radiation beam produced by a
radionuclide source, typically to treat malignant
tumours; it does not provide image-guided radiation
therapy (IGRT) functionality during treatment
delivery.
Class C
70
Telethermographic system
An electrically powered device intended to measure,
without touching the patient's skin, the self-
emanating infrared radiation that reveals the
temperature variations of the surface of the body.
Class A
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Therapeutic
oncological/gynaecological
ultrasound system (High intensity
focused ultrasound (HIFU)
ablation system)
An assembly of electrically-powered devices
intended to treat solid tumours of hard (bone) and/or
soft tissue [e.g., liver, kidney, breast, prostate]
and/or gynaecological disorders (e.g., uterine fibroid,
adenomyosis, etc.) through noninvasive or non-
surgically invasive localized application of high
intensity focused ultrasound (HIFU) or high intensity
therapeutic ultrasound (HITU) intended to gradually
denature/ablate tissue lesions.
Class C
72
Tumour-therapy radio-frequency
hyperthermia system
A mains electricity (AC-powered) device assembly
intended for controlled heating (i.e., temperatures
around 43° Celsius) of the body using radio-
frequency (RF) energy, for the treatment of
malignant or benign tumours, or other disease
conditions; it is not intended for direct tissue
ablation. It is intended for both whole-body and
localized heating of tissues/organs.
Class C
73
Tumour-therapy radio-frequency
hyperthermia system applicator,
intracorporeal
A component of a radio-frequency (RF)
hyperthermia system intended to be placed in the
body (either manually or endoscopically) to deliver
RF energy to produce a systemic or local heating
effect for the treatment of malignant or benign
tumours, or other disease conditions. It is also
referred to as an interstitial applicator or probe. This
is a single use device.
Class C
74
Ultrasonic hyperthermia
system/Ultrasonic ablation
system
An assembly of devices intended to produce and
control the delivery of high heat (i.e., temperatures
greater than 43 deg Celsius) to the body using
ultrasonic energy for the intracorporeal or
extracorporeal treatment of malignant or benign
tumours, or other disease conditions. It is not
intended for physiotherapy applications.
Class C
75
Ultrasound hyperthermia system
transducer, extracorporeal
An ultrasound (US) transducer assembly that is a
component of an ultrasound hyperthermia system
intended to induce systemic or local body heating of
sufficient magnitude to create a targeted therapeutic
effect. It is mounted within the gantry or housing of
the hyperthermia system or mounted on a floor, wall,
or ceiling suspension that allows the operator to
position the transducer assembly external to the
patient during treatment.
Class C
76
Ultraviolet Extracorporeal
Photopheresis system
An assembly of devices intended for extracorporeal
photoimmunetherapy to treat immune disorders,
especially cutaneous T-cell lymphoma (CTCL). It
irradiates the leukocyte-rich fraction of peripheral
blood by UVA radiation extracorporeally and returns
back the treated and untreated blood to the patient.
This system may or may not use a UV-active drug
(either ingested by patient or injected into the
leukocyte-rich fraction of the extracted peripheral
blood)
Class C
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77 X-ray system tube A replaceable component of a medical or dental diagnostic, or therapeutic x-ray system consisting of a tube (a glass envelope enclosing a filament, anode, cathode under vacuum, and an interface for an electrical connection) intended to convert an input of electrical energy into an output of x-ray energy. It is the x-ray system component that provides a supply of electrons which are free to move, a means of getting the electrons to travel at high-speed, and providing a force which will cause them to suddenly change direction which results in x-ray production. Included are designs referred to as cold-cathode gas discharge tubes, fixed anode tubes, rotating anode tubes, quick change tubes. Class B
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