What Is A Catheter Information Technology Essay

A catheter is a flexible hollow tubing made either of latex silicone, or Teflon which can be slotted into the organic structure of a individual, which creates a channel for fluids to go through through it or for the entry of a medical device. For many old ages, the cuticular catheters that were used so were a field tubing that was produced from industrial compounds that was available and the design for any peculiar catheter was chiefly based on what the intended usage of the supposed device is to be, in other words a catheter designed will hold the characteristic that will heighten the use of the device in a individual.

In the 1950s and early 1960s, there was a really common pattern which was to cut a proper size of industrial polyvinyl chloride ( PVC ) or nylon tube and have it disinfected with the other surgical equipment. Nowadays, there are many specialised catheter designs. For illustration, specific catheter designs allow catheters to be used in pneumonic, cardiac ( vascular ) , neonatal, cardinal nervous system, and extradural tissues. Catheters are designed to execute tissue extirpation ( tissue remotion ) and even function as channel for thermic, optics, and several other medical devices.

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There are 3 major types of catheter

Coronary- this are used for angiography ( x-ray of blood vas after the injection of radiopague substance ) used as for angioplasty ( altering the construction of a vas ) , and it is besides used for ultrasound processs in the bosom or in peripheral venas and arterias.

Nephritic – this are used for urine incontinency ( an inability to command ) , deceasing patient and vesica drainage following surgery, a really intolerable hurt or illness.

Infusion – this are used for infixing drugs into the organic structure, which allows easy mark of an isolate countries within the organic structure where the infused drugs are delivered.

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Fig 1The image above is an illustration of how the catheter is inserted into a human urinary piece of land.


In the first measure in bring forthing a Foley catheter, the long thin tubing that will be inserted into the vesica is made. The liquid gum elastic silicone is poured into room temperature vulcanisation ( RTV ) gum elastic mold. The mold is so shaped to a desire form pattern whether 2 or 3 end product

The Si is heated. This procedure clip is anyplace from 0.5 to 40 hours. After it cools the tubing is taking off from the mold

A little gap is so punched in the distal terminal of the tubing furthest off from the 2 end products.

A thin set of healed latex is slipped over the tubing by manus to organize a sheath around the tubing. It is positioned so that the latex covers the gap that has been punched in the tubing.

To organize the balloon, the whole length of the tubing is immersed into the latex, which creates an greatcoat bed and bonds the set to the tubing closest to the distal and proximal terminals of the set, organizing the balloon.

Fig 2 Foley catheter

adds to the thickness of the balloon and is used to set the outer diameter of the tubing to the desired size.

The catheter is so transported to the packaging Centre where it is put into a kit with a needleless syringe ( to make full the balloon ) and a drainage bag.

Quality control is in built in the fabrication procedure to guarantee a quality catheter ; at each stairss of the fabrication procedure the machine operation checks the concluding merchandise. The thermoplastic stuff is dipped in liquid to guarantee that there are no defects or escape.

The Over-The-Wire Catheter & A ; The Rapid-Exchange Catheter

The OTW and RX catheter is merely like the other catheter, this catheter includes a wire that guides the catheter through it. Wayss are provided for doing the catheter to be put easy and moved within the vascular system with the usher wire and assisting the usher wire to be moved around within the on the job catheter during promotion of the usher wire for maneuvering the catheter through. This makes it possible for the usher wire and the catheter to be put at the same clip, without revolving the catheter, by revolving it this could damage the working catheter, such as “ balloon wrapper ” . A catheter system in conformity with the present innovation may besides include a usher wire sized for interpolation into an carnal vascular system and holding a proximal and a distal terminal. The distal terminal includes a agency for progressing the usher wire through the vascular system which is more peculiarly may include a flexible, yet shape-able, end part.

The agencies provided for enabling rotary motion of the usher wire within the working catheter allows the way and re way of the shape-able flexible terminal part to places suited for progressing the usher wire, with the working catheter coupled thereto, through the vascular system.

Fig 3 OTW Catheter

Rapid-exchange ( RX ) systems, which are the current criterion for coronary intercessions, have significantly reduced the usage of fluoroscopy and shortened procedural clip compared to the conventional over-the wire ( OTW ) coronary angioplasty systems, with indistinguishable success and complication rates. Besides the characteristics of shorter and more comfy to manage wires, the RX devices besides allow the usage of smaller diameter wires, catheters, and stents. Hence, RX systems are going progressively popular for non coronary intercessions, peculiarly carotid and nephritic processs. Transdermal nephritic angioplasty is a safe, lasting, and effectual option for patients with renovascular high blood pressure and has the possible to decelerate the progressive diminution in nephritic map. Technological betterments in nephritic arteria intercessions have well reduced the complication rate in the past 5 years.6 However, it is virtually unknown whether the usage of RX systems specifically translates into a clinically relevant benefit for the patient in footings of increased procedural safety.


Medical device is a term used in general to specify medical merchandises that are manufactured which, chiefly because of the physical consequence of the device, is used for medical intents of patients. In medical device fabrication, and even in all fabrication, it is impossible non to hold fluctuation in procedures. It is from this fluctuation the demand for quality control is set. When doing medical devices it frequently is the instance that, fabrication and so matching of little parts with complex geometries and tight tolerances, particularly with stuffs like Ti and nitinol. This makes the procedure of production more complex so therefore the merchandise and procedure control quality control becomes more critical. Product quality is a really of import portion in medical device fabrication, because quality in medical device agencies safety for the patient, Poor quality of merchandises can take to patient hurt and decease. Hence, a cardinal challenge for maker is to ever look into for, understand and extinguish the root causes for fluctuation of a merchandise. The usage of statistical techniques helps in analysing fluctuation, so as to place, and predict the systems behaviour. Most medical device makers use statistical techniques under the counsel of quality direction systems.

Statistical techniques are really of import in fabrication because they are known to better the quality of a product/device and for better fabrication efficiency. When statistical techniques are successfully used it can assist makers increase productiveness of people, equipment and fabrication systems, more peculiarly in the medical device sector, it can be really helpful for the safety of patient when the merchandise is ever of a high quality. Commercially the importance of the proper usage of statistical technique has been recognised by major participants in the sector. For illustration, in Ireland Boston scientific vice-president, Fred Colen, said that their company ‘s displacement to a statistics grounded quality control system is a ‘new twenty-four hours ‘ for the company. Meanwhile at authorities degree the importance of statistical techniques has been highlighted in the publication ‘Future Skill of the Irish Medical Device Sector ‘ . Those in the sector will be cognizant of the demand for proper use of the technique because of the increasing review taken, by regulative and accreditation organic structures.

[ Demot Hale and John Sheil, Statistical Techniques in Medical Device Manufacturing, College of Engineering & A ; information sciences, NUI Galway, Ireland. ]

Coupled with the market and patient safety force per unit areas, medical device industries must run into with the demands of regulative and accreditation organic structures. The regulative

bureaus lay down demands from pre-design to post terminal of life, for medical devices. So when these regulative demands are met, the opportunities of merchandises that are insecure come ining the market topographic point are greatly minimized. Universally, there are assorted bureaus that regulate medical devices. For Irish makers the ISO household of criterions, United States FDA quality system ordinance ( QSR ) , and the CE Medical Device directives, are really of import.

2.3 CE Medical Device Regulations ( Measure of safety )

For a medical merchandise to be sold in Europe there must ever be a clearly labelled CE Mark on the peculiar merchandise, or on its packaging. CE taging attached to a medical merchandise is a lawfully blessing of that merchandise, which signifies that the merchandise has met all the demands of the Medical Device Directive ( MDD 93/42/EEC ) , In Vitro Diagnostic Device Directive ( IVDD 98/79/EC ) , or the Active Implantable Medical Device Directive ( AIMD 90/385/EEC ) , depending on the medical device in inquiry.

MDD 93/42/EEC comprises of 22 narrations, 23 articles and 12 extensions. The narrations are the statement of policies, while the article describes the regulating Torahs and the extensions describes the mechanism the directive ( the regulations, demand and appraisal ) . Governments nominative administrations, which are known as the notified organic structures are responsible for doing certain that the medical device meets the directives demands. The demand directive processs are described in Annexes II, III, IV, V, VI and VII. Statistical techniques are referred to in Annex IV: EC Verification. This annex directs the peculiar notified organic structure the methods be used for proving the populations of medical devices. In the instance that a medical device can non be examined separately, the notified organic structure will execute a statistical confirmation. From this maker will be directed to show the same batches from which a random sample will be taken. The trying method must guarantee that the quality bound correspond to a chance of credence of 5 % , with a non-conformity per centum of between 3 % and 7 % .

MDD 2007/47/EC, is the latest alteration to MDD 93/42/EEC, which came into jurisprudence on the 21st of March 2010. It has been modified and now includes statistical control based on variables, and every bit good it says that trying strategy should hold ‘operational features which guarantee a high degree of safety and public presentation harmonizing to the province of art ‘ . But with MDD 93/42/EEC the directives states that the ‘sampling strategies will be established by the consonant criterions.

IVDD 98/79/EC this is directing for devices that are used for the extraction of specimen from the human organic structure, like reagents instruments and specimen in a container. In the IVDD 98/79/EC, statistical demand can be seen in Annex VI: EC Verification, necessitating trying strategies for merchandise testing where every device can non be tested separately. As with MDD 2007/47/EC, ‘statistical control of merchandises is base on properties or variables affecting a high degree of safety and public presentation harmonizing to the province of art ‘ . The trying strategy will once more be established via the ISO harmonised criterions.

AIMDD 90/385/EEC is a directing which is used for devices which are to be to the full or partly inserted surgically or medically into the human organic structure, and that is traveling to stay in the organic structure after the process. Statistical demands for this can be found in Annex IV: EC Verification, necessitating trying strategies for merchandise testing where every device can non be tested separately. The directives states that ‘statistical control of merchandises will be based on properties implying a sampling system with the undermentioned features:

A degree of quality matching to a chance of credence of 95 % , with a non conformance per centum of between 0.29 and 1 % .

A bound quality matching to a chance of credence of 5 % , with a per centum of non-conformity of between 3 and 7 % .

As earlier in the old directive the trying strategy will be established through the ISO 13485 criterion.

Table 1 – A common model for medical device ordinances


The Food & A ; Drug disposal is a step of Safety and Effectiveness of a merchandise ; it is an bureau of the United States Department of Health and Human Services that is responsible for modulating and oversing the safety, efficiency and security of nutrients, runing from dietetic addendums, drugs vaccinums, biological medical merchandises, blood merchandises, medical devices, radiation-emitting devices, veterinary merchandises and cosmetics.

FDA develops and executes the current Good Fabrication practises ( cGMP ) within the quality System Regulation ( QSR ) for medical devices. A maker must show all these ordinance to run into the footings of the Regulation so that the device can be lawfully approved so so it can be marketed.

As stated by the regulating organic structure for statistical technique which is referred to Subpart J, Constructing a CAPA ; appropriate statistical methodological analysis shall be employed where necessary to observe repeating quality jobs and in ‘Analysing service studies ‘ ; each maker shall analyse service studies with appropriate statistical methodological analysis.

Sub portion O which is peculiarly dedicated to statistical techniques has the undermentioned statement:

Where appropriate, each industry shall set up and keep processs for placing valid statistical techniques required for set uping, commanding, and verifying the acceptableness of procedure capableness and merchandise features

Sampling programs, when used, shall be written and based on a valid statistical principle. Each maker shall set up and keep processs to guarantee than trying methods are equal for their intended usage to guarantee that when alterations occur the sampling programs are reviewed. These activities shall be documented

In instances where the maker can prove merchandises for conformity, the usher states the maker either trials all merchandises or tests a part of the merchandises utilizing trying program based on an acceptable statistical principle. A maker shall be prepared to show the statistical principle for any sampling program used. Plans should be developed by qualified mathematicians or statisticians, or be taken from established criterions such as ANSI ZI.4. So from this statement one can see the hazard that is involved with sampling and notes that the sampling hazard is usually determined in quantitative footings by finding the ‘operating characteristic curve ‘ for the selected program.


This is lay-down papers that guides a fabrication industry. The Quality System Inspection Technique ( QSIT ) is a critical papers which has been prepared by the FDA to assist guild people working in the medical device industries. As a papers which is for the populace, the QSIT is of great relevancy to makers because it is this really the statements that are really clear and directs how to come in footings with the demands of 21 CFR Part 820. Part of the quality system that is of import is the disciplinary and preventative action ( CAPA ) subsystem. In relation to statistical techniques from the CAPA subsystem, it is the QSIT that recommends the usage of proper statistical procedure control techniques to supply grounds of conformity with the preventive action demand.

When analyzing a quality job that keeps resurfacing the QSIT high spots Pareto analysis, spreadsheets and pie charts as statistical techniques. In the instance of production and procedure control and monitoring activities will be based on a valid statistical principle.

The Medical Device Reporting ( MDR ) devised a method for FDA so that they would be able to place and supervise the existent hapless events affecting in medical devices, so that this job may be prevented and corrected every bit shortly as it is detected.

2.6 ISO / ISO Guidance papers

The International Standards Organisation ( ISO ) is an international criterion industries uses as a benchmark for quality direction. ISO 13485 is the criterion that medical device industry uses for quality direction. While this is one its ain, it is based on the ISO 9001. The enfranchisement ISO 13485 illustrates that the maker must ever run into the demand of the client and besides of import regulative demands of medical devices.

ISO 13485 uses this procedure for quality direction which is sub-divided into 8 subdivisions:

Clause 1-3: Summarizes the range, mentions, footings and definition of the directives

Clause 4: Describes the papers control demands for a quality direction system.

Clause 5: Describes direction duties.

Section 6: Summarizes the demands for the direction resources.

From this clause, Section 6.2.2 provinces that ‘the administration shall find the necessary competency for forces executing a work impacting merchandise quality and supply preparation or take actions to fulfill these demands. This is an of import consideration for those utilizing the statistical techniques. it mandates an administration to choose the proper tool to rectify state of affairss. Clause 7 is more peculiar on merchandise realisation, incorporating demands sing design and development, buying proof, traceability and supply of finished merchandise.

In ISO 9001 the demands for statistical techniques is seen merely in clause 8: Measurement, Analysis & A ; Improvement, where the way is as follow ; the organisation shall be after and implement the monitoring, measuring, analysis and betterment procedures needed:

a ) To show conformance of the merchandise.

B ) To guarantee conformance of the quality direction system and

degree Celsius ) To keep the effectivity of the quality direction system. This shall include finding of applicable methods including statistical techniques and the degree to which it is used on the medical device.

ISO counsel papers is a proficient study which is used in helping and administration and the one used for statistical techniques is ISO/TR 10017. It is helpful for statistical techniques and serves as a usher in developing, implementing maintaining and bettering a quality direction system in conformity with the demands of ISO 9001. This counsel papers is really of import to medical device makers.

ISO/TR 10017, provinces that the justification for utilizing a peculiar statistical technique is that their application would assist to better the effectivity of the quality direction system.

The statistical techniques identified by ISO / TR 10017 are:

Measurement analysis

Statistical Process control ( SPC )

Design of Experiments ( DOE )

Process Capability Analysis

Descriptive statistics

Hypothesis Testing

Arrested development Analysis

Dependability Analysis



Time Series Analysis

From the each of the technique is described under the undermentioned header, what it is, what it is required, Restrictions and cautiousness, and illustration of applications. In Technical study it besides lists each clause and sub-clause of ISO 9001 ; for each of them it identifies the demand, or absence of demand for quantitative informations. Where the demand for quantitative informations is identified, it besides identifies possible back uping statistical techniques

Table 2- Quality system criterions used by different Governments

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