IT969475B - Perfezionamento nei dispositivi di erogazione di medicinali aggiusta bili in base ad erogazione in por tata o volum - Google Patents

Perfezionamento nei dispositivi di erogazione di medicinali aggiusta bili in base ad erogazione in por tata o volum

Info

Publication number
IT969475B
IT969475B IT53254/72A IT5325472A IT969475B IT 969475 B IT969475 B IT 969475B IT 53254/72 A IT53254/72 A IT 53254/72A IT 5325472 A IT5325472 A IT 5325472A IT 969475 B IT969475 B IT 969475B
Authority
IT
Italy
Prior art keywords
delivery
improvement
basis
port
volume
Prior art date
Application number
IT53254/72A
Other languages
English (en)
Italian (it)
Inventor
Phee C Mc
Original Assignee
American Hospital Supply Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by American Hospital Supply Corp filed Critical American Hospital Supply Corp
Application granted granted Critical
Publication of IT969475B publication Critical patent/IT969475B/it

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/1412—Burettes, measuring cylinders
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/1411—Drip chambers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4895—Solvent bonding, i.e. the surfaces of the parts to be joined being treated with solvents, swelling or softening agents, without adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/731—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
    • B29C66/7318—Permeability to gases or liquids
    • B29C66/73181—Permeability to gases or liquids permeable
    • B29C66/73182—Permeability to gases or liquids permeable to gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/731—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
    • B29C66/7318—Permeability to gases or liquids
    • B29C66/73185—Permeability to gases or liquids non-permeable
    • B29C66/73187—Permeability to gases or liquids non-permeable to liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/14—Filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/753—Medical equipment; Accessories therefor

Landscapes

  • Health & Medical Sciences (AREA)
  • Vascular Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
IT53254/72A 1971-11-26 1972-10-09 Perfezionamento nei dispositivi di erogazione di medicinali aggiusta bili in base ad erogazione in por tata o volum IT969475B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20250571A 1971-11-26 1971-11-26

Publications (1)

Publication Number Publication Date
IT969475B true IT969475B (it) 1974-03-30

Family

ID=22750165

Family Applications (1)

Application Number Title Priority Date Filing Date
IT53254/72A IT969475B (it) 1971-11-26 1972-10-09 Perfezionamento nei dispositivi di erogazione di medicinali aggiusta bili in base ad erogazione in por tata o volum

Country Status (11)

Country Link
US (1) US3776229A (de)
JP (1) JPS4863591A (de)
BE (1) BE790246A (de)
CA (1) CA1000149A (de)
CH (1) CH550006A (de)
DE (1) DE7236504U (de)
ES (1) ES184882Y (de)
FR (1) FR2160821B1 (de)
GB (1) GB1383975A (de)
IT (1) IT969475B (de)
TR (1) TR17096A (de)

Families Citing this family (53)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951145A (en) * 1973-10-25 1976-04-20 Bob Lee Smith Intravenous measuring chamber
US3954623A (en) * 1974-05-28 1976-05-04 Johnson & Johnson Blood filtration unit
US3941126A (en) * 1974-08-08 1976-03-02 Dietrich Joseph W Apparatus for long term intravenous administration of diluted incompatible multiple medications
JPS5125593U (de) * 1974-08-15 1976-02-25
US3965895A (en) * 1974-08-21 1976-06-29 Cutter Laboratories, Inc. Apparatus for controlled volume and rate administration of liquids
US3967620A (en) * 1974-09-10 1976-07-06 United States Surgical Corporation Volume limiting chamber
US3993066A (en) * 1974-11-01 1976-11-23 Baxter Laboratories, Inc. Burette chamber for use with intravenous solution administration set
US3976068A (en) * 1975-01-03 1976-08-24 Origo, Inc. Drug dispenser for use with intravenous feeding pump
US3982534A (en) * 1975-01-10 1976-09-28 Buckman Thomas P Intravenous administration system
US4332247A (en) * 1978-08-30 1982-06-01 Baxter Travenol Laboratories, Inc. Administration set including burette with pivotable air valve
CA1132424A (en) * 1978-08-30 1982-09-28 Herbert Mittleman Administration set including burette with pivotable air valve
US4269222A (en) * 1979-03-27 1981-05-26 Palti Yoram Prof Constant flow device
US4294249A (en) * 1979-10-18 1981-10-13 Cutter Laboratories, Inc. Swage-molded injection site
US4292969A (en) * 1979-12-19 1981-10-06 Raible Donald A Fluid regulating device with torsional control
US4355639A (en) * 1980-05-21 1982-10-26 Sis-Ter S.P.A. Apparatus for the parenteral administration of liquids at a constant, adjustable flow rate
US4432760A (en) * 1980-07-21 1984-02-21 Baxter Travenol Laboratories, Inc. Administration set including burette with pivotable air valve
US4610374A (en) * 1984-10-29 1986-09-09 Dougherty Brothers Company Apparatus for mixing flowable materials in sealed containers
US4735608A (en) * 1986-05-14 1988-04-05 Del F. Kahan Apparatus for storing and reconstituting antibiotics with intravenous fluids
CA1335167C (en) * 1988-01-25 1995-04-11 Steven C. Jepson Pre-slit injection site and associated cannula
US5964785A (en) * 1988-01-25 1999-10-12 Baxter International Inc. Bayonet look cannula for pre-slit y-site
EP0659448B1 (de) 1988-01-25 1997-03-19 Baxter International Inc. Vorgeschlitzte Injektionsstelle und Spritz zulaufende Kanüle
US5211638A (en) * 1988-01-25 1993-05-18 Baxter International Inc. Pre-slit injection site
CA1330412C (en) 1988-07-08 1994-06-28 Steven C. Jepson Pre-slit injection site and tapered cannula
MX173202B (es) 1989-03-17 1994-02-08 Baxter Int Sitio para colocar inyecciones con pre-hendidura y canula ahusada
JPH0634826B2 (ja) * 1989-07-04 1994-05-11 テルモ株式会社 液体流通弁及びこれを備えた医療器具
US5776125A (en) * 1991-07-30 1998-07-07 Baxter International Inc. Needleless vial access device
US5300034A (en) * 1992-07-29 1994-04-05 Minnesota Mining And Manufacturing Company Iv injection site for the reception of a blunt cannula
US5351383A (en) * 1992-07-29 1994-10-04 Minnesota Mining And Manufacturing Company Method of making an injection or sampling site
US5423751A (en) * 1993-02-18 1995-06-13 Harrison; Samuel W. Contrast media dispensing apparatus
US5593385A (en) * 1993-02-18 1997-01-14 Harrison; Samuel W. Contrast media dispensing apparatus
CA2090291A1 (en) * 1993-02-24 1994-08-25 Yueh-Horng Chen Device for use in controlling intravenous drip
US5779674A (en) * 1996-05-06 1998-07-14 Mallinckrodt Medical, Inc. Fluid gas removal drip chamber
US6162206A (en) * 1997-12-23 2000-12-19 Baxter International Inc. Resealable access site
US6261267B1 (en) * 1998-10-09 2001-07-17 Globe Enterprises, Inc. Automatic IV shut off valve
DE60027811T2 (de) * 1999-03-11 2006-10-19 Medtronic, Inc., Minneapolis In eine Drainagekammer für Cerebrospinalflüssigkeit eingebaute hydrophobe Entlüftung
US6321597B1 (en) * 1999-05-28 2001-11-27 Deka Products Limited Partnership System and method for measuring volume of liquid in a chamber
US6520937B2 (en) 2000-12-18 2003-02-18 Scimed Life Systems, Inc. Fluid injection device
US6554806B2 (en) * 2001-02-05 2003-04-29 Alaris Medical Systems, Inc. Burette safety valve
US20030040707A1 (en) * 2001-08-24 2003-02-27 Kappel Thomas Francis Manual/auto-prime air eliminator
CN101229403B (zh) * 2008-02-27 2010-06-02 龚明秀 莫菲氏滴管
US8070730B2 (en) * 2009-03-27 2011-12-06 Tyco Healthcare Group Lp Integral insufflation valve
CN103495224A (zh) * 2013-09-26 2014-01-08 淮安市恒春医疗器材有限公司 止液罐式自动排气止液输液器
US10094694B2 (en) * 2014-11-24 2018-10-09 Art Healthcare Ltd. Drop and drip measurement
WO2016099596A1 (en) * 2014-12-17 2016-06-23 Mobile I.V. Systems Llc Drip chamber assembly that functions irrespective of orientation
US10105899B2 (en) * 2015-03-26 2018-10-23 Becton, Dickinson And Company IV membrane attachment systems and methods
US10201667B2 (en) 2015-03-26 2019-02-12 Becton, Dickinson And Company IV membrane attachment systems and methods
US10232130B2 (en) 2015-03-26 2019-03-19 Becton, Dickinson And Company Anti-run dry membrane
US10702689B2 (en) 2015-03-26 2020-07-07 Becton, Dickinson And Company Auto-stop vent plug
US10646648B2 (en) 2015-04-01 2020-05-12 Becton, Dickinson And Company IV flow management systems and methods
JP6840723B2 (ja) 2015-08-05 2021-03-10 アート メディカル リミテッドＡｒｔ Ｍｅｄｉｃａｌ Ｌｔｄ． ポイント・オブ・ケア尿分析器
BR102017008203B1 (pt) * 2017-04-20 2020-05-05 Caetano Norival câmara de diluição e gotejamento
EP4003455A4 (de) * 2019-07-26 2023-08-30 Mobile I.V. Systems, LLC Ansaugvorrichtung für eine tropfkammer eines flüssigkeitsinfusionssystems
US20240050643A1 (en) * 2020-10-05 2024-02-15 Mobile I.V. Systems, LLC Drip chamber with automatic vent and shutoff

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB438611A (en) * 1933-05-24 1935-11-20 Paulo Seabra Improvement in liquid injecting apparatus
US2313219A (en) * 1940-07-16 1943-03-09 Herman E Bulling Fluid dispensing container
US2817372A (en) * 1955-03-21 1957-12-24 Sr Courtland H Barr Transfusion assembly
US3216418A (en) * 1962-06-01 1965-11-09 Abbott Lab Apparatus for administering parenteral solutions
US3216419A (en) * 1963-10-17 1965-11-09 Abbott Lab Apparatus for administering a parenteral solution provided with a diaphragm float valve
US3437224A (en) * 1967-01-18 1969-04-08 Dover Molded Products Co Vial closure

Also Published As

Publication number Publication date
US3776229A (en) 1973-12-04
BE790246A (fr) 1973-02-15
ES184882Y (es) 1974-06-16
FR2160821A1 (de) 1973-07-06
ES184882U (es) 1973-09-16
FR2160821B1 (de) 1977-12-30
TR17096A (tr) 1974-04-25
GB1383975A (en) 1974-02-12
DE7236504U (de) 1973-03-01
AU4725172A (en) 1974-04-04
CH550006A (de) 1974-06-14
CA1000149A (en) 1976-11-23
JPS4863591A (de) 1973-09-04

Similar Documents

Publication Publication Date Title
IT969475B (it) Perfezionamento nei dispositivi di erogazione di medicinali aggiusta bili in base ad erogazione in por tata o volum
IT945114B (it) Perfezionamento nei dispositivi retro riflettenti
IT962159B (it) Perfezionamento nei trasduttori di spostamento e o movimento
IT997864B (it) Perfezionamento nei dispositivi ossigenatori di sangue
IT966784B (it) Perfezionamento nei dispositivi per la misurazione della pressione intraoculare
IT973697B (it) Perfezionamento nei dispositivi per erogare fluidi
IT965201B (it) Perfezionamento nei dispositivi di fissaggio
IT965493B (it) Perfezionamento nei procedimenti per il maneggio di frutt
IT974113B (it) Perfezionamento nei trasduttori di pressione differenzial
IT949713B (it) Perfezionamento negli apparecchi per idroterapia
IT969417B (it) Dispositivo per l applicazione di grappette per impiego in chirurgia
IT961318B (it) Perfezionamento nei dispositivi di fissaggio
IT973822B (it) Perfezionamento nei dispositivi per la rivelazione di perdite
IT1004135B (it) Perfezionamento nei procedimenti e nei dispositivi per la pulitura diforme per fonderia
IT952243B (it) Perfezionamento nei complessi badenti per rasci
SE399361B (sv) Injektionsspruta eller liknande anordning for avgivning och fyllning av vetskor
IT1016439B (it) Dispositivo per l inalazione di pol veri fini
IT957845B (it) Perfezionamento nei vibratori
IT961893B (it) Perfezionamento nei trasduttori elettroacustici di tipo elettro statico
IT973447B (it) Perfezionamento nei dispositivi di tenuta
IT946065B (it) Perfezionamenti nei procedimenti per la preparazione di dicloroe tano
IT972277B (it) Perfezionametni nei gruppi valvolari
IT985370B (it) Perfezionamento nei procedimen ti e dispositivi per la rifini tura di copertoni
IT1045680B (it) Perfezionamento nei giroscopi
IT965484B (it) Perfezionamento nei compressori alternativi