The Electrosurgical Generator (OBS-350A) is a non-sterile, reusable multi-purpose electrosurgical generator that is designed to perform monopolar and bipolar functions in the surgical operation area.

Device Description

The generator is enclosed in a metal and molded plastic enclosure and will have an angled front panel in the display and controls area. The front panel displays and controls will be sealed to facilitate cleaning and minimize the possibility of problems caused by accidental spills. The receptacles for the active electrosurgical accessories will be in a recessed area and will conform to IEC60601-1:2005/(R) 2012 And A1:2012.

Device components: Chassis and Cover, Front panel controls, Power supply board, Microprocessor board, Footswitch board, Interface circuits, Front panel receptacles.

Special features: Three CUT modes (Pure CUT, Blend 1, Blend 2), Three COAG modes (COAG1 (Spray), COAG2 (Forced), COAG3 (Soft)), Two Bipolar modes (Bipolar1 (Macro), Bipolar2 (Micro)), Memory (10 memory Presets), CQMS (contact quality monitoring system), Power ON self diagnostics, PPS (peak power system).

AI/ML Overview

Here's a breakdown of the acceptance criteria and study information for the OBS Electrosurgical Generator (model: OBS-350A), based on the provided document:

1. Table of Acceptance Criteria and Reported Device Performance

The acceptance criteria in this document are primarily based on achieving "substantial equivalence" to a predicate device (Valleylab Force FX). This means the OBS-350A is considered acceptable if its performance is comparable to the predicate across various parameters, particularly regarding safety and effectiveness.

Acceptance Criteria Category	Specific Criteria/Tests	Reported Device Performance (OBS-350A vs. Predicate)	Outcome
Intended Use	Same as predicate	Electrosurgical Generator for monopolar and bipolar functions in surgical operations.	Achieved
Technological Characteristics & Principles of Operation	Similar to predicate	HF energy, Monopolar and Bipolar output waveforms.	Achieved
Electrical Waveforms	Comparable to predicate	"The electrical waveforms of the OBS-350A were comparable to the electrical waveforms of the predicate devices. This was confirmed for all output modes (waveforms) at rated load."	Achieved
Tissue Thermal Effects	Comparable to predicate	"The tissue thermal effects test was conducted by OBS-350A and predicate devices to demonstrate the tissue thermal effects equivalence in porcine muscle, kidney and liver tissue." "Tissue thermal effects tests by OBS-350A and predicate devices demonstrate the similarity of thermal effects in three tissues."	Achieved
Safety Standards	Compliance with ES60601-1:2005/(R)2012 And A1:2012	Complies with ES60601-1:2005/(R)2012 And A1:2012	Achieved
Performance Standards	Compliance with IEC60601-2-2:2009	Complies with IEC60601-2-2:2009	Achieved
EMC Standards	Compliance with IEC60601-1-2:2007	Complies with IEC60601-1-2:2007	Achieved
Output Powers	Comparable range to predicate	See detailed power output comparison in the document (Table on Page 8). Most values for power, voltage, and frequency are similar or within acceptable ranges.	Achieved (deemed "SE")
Open Circuit Vp-p (max)	Comparable range to predicate	See detailed open circuit voltage comparison in the document (Table on Page 8). Most values are similar or within acceptable ranges.	Achieved (deemed "SE")
Accessory Compatibility	Legally marketed and compatible. Maximum electrical capacity of accessories ≥4500 Vp	Accessories are legally marketed and have a max electrical capacity ≥4500 Vp. Specific OBS accessories are recommended.	Achieved
CQMS (Contact Quality Monitoring System)	Measures resistance between ESU pad and patient; alarms if >113 ohms; stops output.	Described as functioning as designed.	Achieved
Power ON self diagnostics	All working modes/functions simulated and monitored; displays error codes and alarms if failure occurs; disables operations.	Described as functioning as designed.	Achieved
PPS (Peak Power System)	Automatically senses resistance and adjusts output voltage to maintain consistent effect.	Described as functioning in Pure CUT, Blend CUT, and Bipolar modes.	Achieved
Duty Cycle	10 seconds on, 30 seconds off for 1 hour at max power and rated load.	Described as suitable for this duty cycle.	Achieved

2. Sample Size for the Test Set and Data Provenance

Sample Size for Test Set: The document does not specify a numerical sample size for the "test set" in terms of number of devices or number of tissue samples for the bench testing. It refers to "evaluations" and "tests."
Data Provenance: The testing was "bench" testing, comparing the performance of the OBS-350A against its own design specifications and against the predicate device (Valleylab Force FX). The document implicitly indicates the testing was done by the manufacturer (Baisheng Medical Co., Ltd.) as part of their submission for market clearance. No country of origin for test data is explicitly stated beyond the manufacturer's location in China. The testing is considered prospective in the sense that it was conducted directly to support this 510(k) submission.

3. Number of Experts Used to Establish Ground Truth for the Test Set and Qualifications

The document does not mention the use of experts to establish a "ground truth" for the test set. The evaluation is focused on direct comparison of physical and electrical characteristics and compliance with recognized standards. This is typical for electrosurgical generators, where performance is objectively measured rather than subjectively interpreted (like image analysis).

4. Adjudication Method for the Test Set

No adjudication method is described, as the testing involves objective measurements rather than subjective assessments requiring reader adjudication.

5. If a Multi-Reader Multi-Case (MRMC) Comparative Effectiveness Study was done

No, an MRMC comparative effectiveness study was not done. The document explicitly states: "Clinical and animal studies were not deemed necessary to support substantial equivalence." This type of study would involve human readers (e.g., surgeons) evaluating the device's performance, which was not performed or required here.

6. If a Standalone (i.e. algorithm only without human-in-the-loop performance) was done

This question is not applicable in the context of an electrosurgical generator. A standalone "algorithm" performance is relevant for AI/software devices that make diagnostic or treatment recommendations. The OBS-350A is a physical medical device that applies energy. Its performance is measured directly, not via an algorithm operating independently to produce an outcome. The document does mention software validation for the device's embedded software, which would be a form of "standalone" software assessment, but not in the AI/human-in-the-loop sense.

7. The Type of Ground Truth Used

The "ground truth" in this context is established by:
- Design Specifications: The device's performance is compared against its own defined design specifications.
- Predicate Device Performance: Direct comparison of electrical waveforms and tissue thermal effects against a legally marketed predicate device (Valleylab Force FX).
- Recognized Standards: Compliance with international standards such as IEC 60601-1, IEC 60601-2-2, and IEC 60601-1-2.

8. The Sample Size for the Training Set

This question is not applicable. The OBS-350A is an electrosurgical generator, not an AI/machine learning device that requires a "training set" of data.

9. How the Ground Truth for the Training Set was Established

This question is not applicable, as there is no "training set" for this type of medical device.

Summary

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Image /page/0/Picture/1 description: The image shows the logo for the U.S. Department of Health and Human Services. The logo features a stylized caduceus symbol, which is a staff with two snakes entwined around it. The words "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" are arranged in a circular pattern around the caduceus symbol. The logo is simple and recognizable, and it is used to represent the U.S. Department of Health and Human Services.

Food and Drug Administration 10903 New Hampshire Avenue Document Control Center - WO66-G609 Silver Spring, MD 20993-0002

January 30, 2017

Baisheng Medical Co., Ltd. % Mr. Albert T.W. Li Manager, Principle Administrator Office of Medical Device Evaluation Center for Measurement Standards Industrial Technology Research Institute Room 307, Bldg. 4, 321, Sec. 2 Kuang Fu Rd Hsinchu, Taiwan 30011 R.O.C.

Re: K162034

Trade/Device Name: OBS Electrosurgical Generator (model: OBS-350A) Regulation Number: 21 CFR 878.4400 Regulation Name: Electrosurgical Cutting and Coagulation Device and Accessories Regulatory Class: Class II Product Code: GEI Dated: July 22, 2016 Received: July 22, 2016

Dear Mr. Li:

We have reviewed your Section 510(k) premarket notification of intent to market the device referenced above and have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments, or to devices that have been reclassified in accordance with the provisions of the Federal Food, Drug, and Cosmetic Act (Act) that do not require approval of a premarket approval application (PMA). You may, therefore, market the device, subject to the general controls provisions of the Act. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration. Please note: CDRH does not evaluate information related to contract liability warranties. We remind you, however, that device labeling must be truthful and not misleading.

If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it may be subject to additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 898. In addition, FDA may publish further announcements concerning your device in the Federal Register.

Please be advised that FDA's issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal statutes and regulations administered by other Federal agencies. You must comply with all the Act's requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part 801); medical device reporting (reporting of medical device

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related adverse events) (21 CFR 803); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820); and if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.

If you desire specific advice for your device on our labeling regulation (21 CFR Part 801), please contact the Division of Industry and Consumer Education at its toll-free number (800) 638-2041 or (301) 796-7100 or at its Internet address

http://www.fda.gov/MedicalDevices/ResourcesforYou/Industry/default.htm. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR Part 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please go to

http://www.fda.gov/MedicalDevices/Safety/ReportaProblem/default.htm for the CDRH's Office of Surveillance and Biometrics/Division of Postmarket Surveillance.

You may obtain other general information on your responsibilities under the Act from the Division of Industry and Consumer Education at its toll-free number (800) 638-2041 or (301) 796-7100 or at its Internet address

http://www.fda.gov/MedicalDevices/ResourcesforYou/Industry/default.htm.

Sincerely yours.

Jennifer R. Stevenson -S

For Binita S. Ashar, M.D., M.B.A., F.A.C.S. Director Division of Surgical Devices Office of Device Evaluation Center for Devices and Radiological Health

Enclosure

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Indications for Use

510(k) Number (if known) K162034

Device Name OBS Electrosurgical Generator

Indications for Use (Describe)

The Electrosurgical Generator (OBS-350A) is a non-sterile, reusable multi-purpose electrosurgical generator that is designed to perform monopolar and bipolar functions in the surgical operation area.

Type of Use (Select one or both, as applicable)
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Prescription ID #1-977-901-Patient Pharmacy	Over The Counter Health #1-977-901-Patient Pharmacy
----------------------------------------------------------------------------------------------------	---------------------------------------------------------------------------------------------

X | Prescription Use (Part 21 CFR 801 Subpart D)

| | Over-The-Counter Use (21 CFR 801 Subpart C)

CONTINUE ON A SEPARATE PAGE IF NEEDED.

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Image /page/3/Picture/0 description: The image shows the logo for OBS, which is a green, stylized water droplet followed by the letters "OBS" in a bold, sans-serif font, also in green. A registered trademark symbol is located in the upper right corner of the logo. The logo is simple and clean, suggesting a focus on water or environmental concerns.

PREMARKET NOTIFICATION 510(K) Summary

This summary of 510(k) safety and effectiveness information is being submitted in accordance with the requirements of SMDA 1990 and Title 21 CFR §807.92.

The assigned 510(k) Number:_ K162034

1.0 Sponsor Identification

Baisheng Medical Co.,Ltd.
Address:	No.11, Fusheng Road, Xinhui District, Jiangmen Guangdong, China.
Phone:	+86-750-6628113 +86-750-6691112
Fax:	+86-750-6616122
General manager:	Mr Chen xi
E-mail:	renzheng@bs0750.com
Contact person:	Peter
E-mail:	peter@bs0750.com
Date	Mar 27th, 2015

2.0 Proposed Device Identification

Trade Name:	OBS Electrosurgical Generator
Model:	OBS-350A
Common Name:	Electrosurgical Generator

Regulatory Information:

Classification Name:	electrosurgical, cutting & coagulation & Devices and accessories;
Classification:	Class II(Product Code GEI)
Regulation Number:	21CFR 878.4400
Review Panel:	General& Plastic Surgery

K162034	Page 1 of 7
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Image /page/4/Picture/0 description: The image shows a green logo with the letters "OBS" in a stylized font. The "O" is shaped like a water droplet, and the "B" and "S" are connected. There is a registered trademark symbol in the upper right corner of the logo. The logo is simple and clean, and the green color suggests a connection to nature or the environment.

3.0 Predicate Device Identification: 510(k) Number: K944602 Predicate Device Trade name: Valleylab Force FX Manufacturer Name: VALLEYLAB INC. Address: 5920 LONGBOW DRIVE BOULDER, CO 80301

4.0 Indication for use

The Electrosurgical Generator (OBS-350A) is a non-sterile, reusable multi-purpose electrosurgical generator that is designed to perform monopolar and bipolar functions in the surgical operation area.

5.0 Device Description

5.1 Operation modes and functions

A 3 CUT modes:

Pure CUT: Pure be used for a clean, precise cut in any tissue with little or no hemostasis.

Blend 1: be applied to any tissues and make slight hemostasis effect while cutting. Blend 2: be applied to any tissues and make good hemostasis effect while cutting.

3 Coaqulation (COAG) modes A

COAG1 (Spray): Spray for coagulating large tissue areas with superficial depth of necrosis.

COAG2 (Forced): can be used in laparoscope surgery and swift contacting coagulation of other elaborate tissues.

COAG3 (Soft): Its coagulation effect on the tissues is deep, but the scope is rather small because of its good effect on the single blood spot.

2 Bipolar modes A

Bipolar1 (Macro): be used for rapid coagulation such as artery vessel sealing, the voltage is higher and there is more power than the other bipolar mode.

Bipolar2 (Micro): be used for most bipolar applications, voltage is kept low to prevent sparking, the power remains constant over a specific range of tissue resistance, allowing consistent tissue effect.

K162034

Page 2 of 7

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Image /page/5/Picture/0 description: The image shows the green OBS logo. The logo consists of a stylized green drop shape followed by the letters "OBS" in a bold, sans-serif font, also in green. A small registered trademark symbol is located in the upper right corner of the logo.

5.2 Physical Characteristics:

5.3 Device components

Chassis and Cover, Front panel controls, Power supply board, Microprocessor board, Footswitch board, Interface circuits, Front panel receptacles.

5.4 Accessories compatible

A First, the accessories shall be Legally marketed in America;
A Second, Compatibility data: max electrical capacity of these accessories ≥4500 Vp which will be available.
く Electrosurgical pencil
イ Split Electrosurgical pad (also named neutral electrode, return electrode, neutral pad...)
く Electrosurqical bipolar forceps
く Footswitch for Monopolar procedures
く Footswitch for Bipolar procedures
く Cord for bipolar forceps
く Cord for electrosurgical pad

Note: The proposed device in this submission is only the ESU generator submitted. To avoid incompatibility and unsafe operation, we recommend using the following OBS accessories with the OBS-350A:

Electrosurgical pencil (510(k) No.: K092634) OBS-Db(#0039D, #0039H, #0025D, #0035H) OBS-Dr(#0038D, #0038H, #0030D, #0030H) OBS-Df(#0048D, #0048H, #0040D, #0040H)
V Split Electrosurgical pad (510(k) No .: K102372) GBS-Db(#1031a, #1131a, #1031b, #1131b, #1041a, #1031n, #1131n, #2031, #2131, #3031, #1031ac, #1041ac)
5.5 Special features
- A Three CUT modes: Pure CUT, Blend 1, Blend 2;
- Three COAG mode: COAG1(Spray), COAG2(Forced), COAG3(Soft);
- Two Bipolar modes: Bipolar1(Macro) and Bipolar2(Micro);
- A Memory: 10 memory Presets, the unit automatically reset to the last activated Preset setting:

K162034	Page 3 of 7

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Image /page/6/Picture/0 description: The image shows the logo for OBS, which is a green stylized water droplet followed by the letters "OBS" in green. A registered trademark symbol is located in the upper right corner of the logo. The logo is simple and clean, and the green color suggests a connection to nature or the environment.

CQMS (contact quality monitoring system): The ESU pad contact quality monitor system (CQMS) will measure the resistance bewteen the ESU pad and patient, if the resistance was beyond the defined upper limit, the alarm system will be activaed. During monopolar electrosurgery, a patient Split ESU pad is always required to safely recover the current that flows through the patient's body and return it to the generator. A reduction in surface area contact or poor conductivity between the patient and the ESU pad can cause the current to become concentrated, potentially resulting in burns at the ESU pad site.

The OBS-350A generator uses the CQMS to monitor the quality of electrical contact between the patient ESU pad and the patient. The CQMS function is designed to minimize the risk of burns at the ESU site due to a reduction in patient contact area during monopolar electrosurgery.

A How the CQMS works
The CQMS continuously measures the resistance at the ESU pad site and compares it to a standard value of safe resistance (less than 113ohms), thus under the condition of ESU pad releases or shrinks, the contact area to skin would be reduced, and the contact resistance increased, when the resistance is above 113ohms, the alarm will be activated by Red of "ALARM" indicator as well as Error code(Err--0) displayed on the CUT screen, at the same time a continuous alarm voice( > 65db) initiated, and the generator will stop output simultaneously, the alarm cannot be disabled unless the ESU pad adhered in a good condition again.
A Power ON self diagnostics: In the self diagnosis process after Power ON, all working modes and functions operating are simulated and monitored by software control to determine whether they are performed normally, followed by transmitting of corresponding test data to the display module through the control module. If failure occurs, the respective code will be displayed accordingly as prompt and alarm voice delivered simultaneously, which disables all subsequent operations automatically.
A PPS (peak power system):The OBS-350A automatically senses resistance and adjusts the output voltage to maintain a consistent effect across different tissue density. This adjustment is based on the selected mode, the power setting and the level of tissue resistance. The maximum output voltage is controlled to reduce capacitive coupling and video interference and to minimize sparking.

। Pure CUT, Blend CUT and Bipolar modes are equipped this PPS function.

5.6 Duty Cycle

Under maximum power settings and rated load conditions (pure cut350W, 500ohm load) the generator is suitable for activation times of 10seconds on, 30seconds off for 1 hour.

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Image /page/7/Picture/0 description: The image shows the logo for OBS, which is a green, stylized design. The logo consists of three connected shapes that form the letters 'OBS'. The 'O' is a rounded shape, the 'B' is a similar shape with a vertical line extending upwards, and the 'S' is a curved shape. A small 'R' in a circle, indicating a registered trademark, is located in the upper right corner of the logo.

6.0 Performance Data

The performance data were provided in support of the substantial equivalence determination. All standards applied were FDA recognized international standards. The software validation activities were performed in accordance with the FDA Guidance, "Guidance for the Content of Premarket Submissions for Software Contained in Medical Devices" (May 11, 2005). The device software is considered a "Moderate Level of Concern".

6.1 Performance Testing - Bench

In general, the evaluations compared the function of the OBS-350A against the performance characteristics defined by the Design Specification and in comparison to the performance characteristics of the predicate devices. To demonstrate substantial equivalence the following aspects were considered within the validation versus the predicate devices. The results demonstrate that comparable tissue effects and electrical waveforms are achieved with subject and predicate devices for all modes of operation.

The purpose of the bench validation testing was to show equivalence of the electrical waveform between the subject and predicate devices. An oscilloscope and high voltage probe were used as measuring and test equipment. The electrical waveforms of the OBS-350A were comparable to the electrical waveforms of the predicate devices. This was confirmed for all output modes (waveforms) at rated load.

The tissue thermal effects test was conducted by OBS-350A and predicate devices to demonstrate the tissue thermal effects equivalence in porcine muscle, kidney and liver tissue. Thermal Zone Damage Report for OBS-350A and predicate devices are provided in Chapter 029_Appendix 8.

Comprehensive validation bench tests demonstrated and confirmed substantial equivalence to the predicate devices. Testing confirmed that comparable tissue effects and electrical waveforms could be achieved for all modes of operation. Clinical and animal studies were not deemed necessary to support substantial equivalence.

7.0 Substantially Equivalent (SE) Conclusion

The following table compares the proposed device with the predicate device on respects of intended use, technological characteristics and principles of operation as well as performance conformance.

K162034		Page 5 of 7
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Image /page/8/Picture/0 description: The image shows a green logo with the letters "OBS" in a stylized font. The "O" is shaped like a water droplet, and the "S" has a curved, flowing design. A registered trademark symbol is located in the upper right corner of the logo. The logo is simple and clean, with a focus on the letters and the water droplet shape.

Items	Proposed deviceOBS-350A	Predicate device(Force FX)	SECompare
ProductCode	GEI	GEI	Same
RegulationNumber	878.4400	878.4400	Same
Indicationfor use	The Electrosurgical Generator(OBS-350A) is a non-sterile,reusable multi-purposeelectrosurgical generator that isdesigned to perform monopolarand bipolar functions in thesurgical operation area.	The Valleylab Force Fx is anisolated, microprocessor basedESU generator intended for use inthe operating room for generalprocedures where ESU cuttingand coagulation is required. Thegenerator is equipped withmonopolar and bipolar outputs.	SE
Energy	HF energy	HF energy	Same
Input power	120V/230V, 60Hz/50Hz	100-120V/220-240V, 60Hz/50Hz	SE
Powerconsumption	880VA	850VA	SE
Outputfrequency	330~460KHz Sinusoid	390~470KHz Sinusoid	SE
Output Mode	Pure cut:350Wmax, Load:500Ω,Blend 1(macro):250Wmax, Load:500Ω,Blend 2(micro):150Wmax, Load:500Ω,COAG1(Spray):120Wmax, Load:500Ω,COAG2(Forced):100Wmax, Load:500Ω,COAG3(Soft):50Wmax, Load:500Ω,Bipolar1(macro):100Wmax, Load:100Ω,Bipolar2(micro):100Wmax, Load:100Ω,	Low cut: 300Wmax, Load:300Ω,Pure cut:300Wmax, Load:300Ω,Blend: 200Wmax, Load:300Ω,Low(Desiccate):120Wmax,Load:500Ω, Crest factor:5.0Med(Fulgurate):120Wmax,Load:500Ω, Crest factor:7.0High(Spray):120Wmax,Load:500Ω,Crest factor:8.0BIPOLAR:Low(Precise):70Wmax, Load:100Ω,Med(Standard) :70Wmax, Load:100Ω,Macro:70Wmax, Load:100Ω,	SE

Items	Proposed deviceOBS-350A	Predicate device(Force FX)	SECompare
Open circuitVp-p(max)	Monopolar CUTPure: 2120VBlend1: 2720VBlend2: 2200VMonopolar COAGCOAG1(Spray):4500VCOAG2(Forced): 4150VCOAG2(soft): 2500VBipolar:Bipolar1(macro): 500VBipolar2(micro):350V	Monopolar CUTLow: 1350VPure: 2300VBlend: 3300VMonopolar COAGDesiccate:3500VFulgurate: 8500VSpray: 9000VBipolar:Precise: 450VStandard: 320VMacro: 750V	SE
Outputwaveform	Monopolar and bipolar	Monopolar and bipolar	SE
Safety	ES60601-1:2005/(R)2012And A1:2012	IEC60601-1:2005	Same
Performance	IEC60601-2-2:2009	IEC60601-2-2:2009	Same
EMC	IEC60601-1-2:2007	IEC60601-1-2:2007	Same

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Image /page/9/Picture/0 description: The image shows the logo for OBS, which is a green, stylized water droplet next to the letters "OBS" in a bold, green font. A circled "R" trademark symbol is located in the upper right corner of the image. The background is white.

The tissue thermal effects tests by OBS-350A and predicate devices demonstrate the similarity of thermal effects in three tissues, verified substantial equivalence with predicate devices.

8.0 Comparison to Predicate Devices and conclusions

The Electrosurgical Generator model OBS-350A has the same intended use, operating procedures, principles of operation, technology and tissue thermal effects as the predicate devices. The OBS-350A does not raise additional issues of safety or efficacy compared to the predicate devices, and the slight differences have been proved to be substantial equivalence by performance bench test and comparison analyzing. Thus, the subject device and predicate device are substantial equivalence (SE).

Regulation Number and Section

§ 878.4400 Electrosurgical cutting and coagulation device and accessories.

(a)
Identification. An electrosurgical cutting and coagulation device and accessories is a device intended to remove tissue and control bleeding by use of high-frequency electrical current.(b)
Classification. Class II.