x
Feedback Get in Touch
Print Feedback Get in Touch

  • Forcep inserts

    Reliable performance

    Catalogue

Biopsy

Biopsy Forceps Inserts

Biopsy

Ø5mm

33cm WL (Standard)

Swipe for more information

33cm WL (Standard)
Re-order Description Size Minimum qty Sterile
400082 Eisner™ 5mm Biopsy Forceps 11mm Jaw 1 pc Non-Sterile
400521 Eisner™ 5mm Biopsy Pin Forceps 10mm Jaw 1 pc Non-Sterile
400100 Eisner™ 5mm Biopsy Punch Forceps 11mm Jaw 1 pc Non-Sterile
400086 Eisner™ 5mm Blakesley Biopsy Forceps 10mm Jaw 1 pc Non-Sterile
400080 Eisner™ 5mm Minibite Biopsy Forceps 8mm Jaw 1 pc Non-Sterile

45cm WL (Bariatric)

Swipe for more information

45cm WL (Bariatric)
Re-order Description Size Minimum qty Sterile
401082 Eisner™ 5mm Biopsy Forceps 11mm Jaw 1 pc Non-Sterile
401521 Eisner™ 5mm Biopsy Pin Forceps 10mm Jaw 1 pc Non-Sterile
401100 Eisner™ 5mm Biopsy Punch Forceps 11mm Jaw 1 pc Non-Sterile
401086 Eisner™ 5mm Blakesley Biopsy Forceps 10mm Jaw 1 pc Non-Sterile
401080 Eisner™ 5mm Minibite Biopsy Forceps 8mm Jaw 1 pc Non-Sterile

Ø10mm

33cm WL (Standard)

Swipe for more information

33cm WL (Standard)
Re-order Description Size Minimum qty Sterile
400720 Eisner™ 10mm Spoon Forceps 27mm Jaw 1 pc Non-Sterile

45cm WL (Bariatric)

Swipe for more information

45cm WL (Bariatric)
Re-order Description Size Minimum qty Sterile
401720 Eisner™ 10mm Spoon Forceps 27mm Jaw 1 pc Non-Sterile

Clamps

Clamp Forcep Inserts

Clamps

Ø5mm

33cm WL (Standard)

Swipe for more information

33cm WL (Standard)
Re-order Description Size Minimum qty Sterile
400102 Eisner™ 5mm DeBakey Forceps 20mm Jaw 1 pc Non-Sterile
400103 Eisner™ 5mm DeBakey Forceps 30mm Jaw 1 pc Non-Sterile
400104 Eisner™ 5mm DeBakey Forceps 40mm Jaw 1 pc Non-Sterile
400287 Eisner™ 5mm Dorsey Fenestrated Forceps 43mm Jaw 1 pc Non-Sterile
400012 Eisner™ 5mm Hunter Jaeger Forceps 21mm Jaw 1 pc Non-Sterile
400311 Eisner™ 5mm Marques DA Double Fen. Forceps 25mm Jaw 1 pc Non-Sterile
400313 Eisner™ 5mm Marques DA Triple Fen. Forceps 35mm Jaw 1 pc Non-Sterile
400310 Eisner™ 5mm Marques SA Double Fen. Forceps 25mm Jaw 1 pc Non-Sterile
400312 Eisner™ 5mm Marques SA Triple Fen. Forceps 35mm Jaw 1 pc Non-Sterile
400314 Eisner™ 5mm Marques Upcurve Forceps 25mm Jaw 1 pc Non-Sterile

45cm WL (Bariatric)

Swipe for more information

45cm WL (Bariatric)
Re-order Description Size Minimum qty Sterile
401102 Eisner™ 5mm DeBakey Forceps 20mm Jaw 1 pc Non-Sterile
401103 Eisner™ 5mm DeBakey Forceps 30mm Jaw 1 pc Non-Sterile
401104 Eisner™ 5mm DeBakey Forceps 40mm Jaw 1 pc Non-Sterile
401287 Eisner™ 5mm Dorsey Fenestrated Forceps 43mm Jaw 1 pc Non-Sterile
401012 Eisner™ 5mm Hunter Jaeger Forceps 21mm Jaw 1 pc Non-Sterile
401311 Eisner™ 5mm Marques DA Double Fen. Forceps 25mm Jaw 1 pc Non-Sterile
401313 Eisner™ 5mm Marques DA Triple Fen. Forceps 35mm Jaw 1 pc Non-Sterile
401310 Eisner™ 5mm Marques SA Double Fen. Forceps 25mm Jaw 1 pc Non-Sterile
401312 Eisner™ 5mm Marques SA Triple Fen. Forceps 35mm Jaw 1 pc Non-Sterile
401314 Eisner™ 5mm Marques Upcurve Forceps 25mm Jaw 1 pc Non-Sterile

Ø10mm

33cm WL (Standard)

Swipe for more information

33cm WL (Standard)
Re-order Description Size Minimum qty Sterile
400781 Eisner™ 10mm Nussbaum Intestinal Forceps 90mm Jaw 1 pc Non-Sterile

45cm WL (Bariatric)

Swipe for more information

45cm WL (Bariatric)
Re-order Description Size Minimum qty Sterile
401781 Eisner™ 10mm Nussbaum Intestinal Forceps 90mm Jaw 1 pc Non-Sterile

Curved Vascular Clamps

Curved Vascular Clamp Forceps Inserts

Curved Vascular Clamps

Ø5mm

33cm WL (Standard)

Swipe for more information

33cm WL (Standard)
Re-order Description Size Minimum qty Sterile
400204 Eisner™ 5mm Crafoord 35 Clamp Forceps 35mm Jaw 1 pc Non-Sterile
400206 Eisner™ 5mm Crafoord 50 Clamp Forceps 50mm Jaw 1 pc Non-Sterile
400220 Eisner™ 5mm DeBakey Curved 50 Clamp Forceps 50mm Jaw 1 pc Non-Sterile
400221 Eisner™ 5mm DeBakey S-shape 50 Clamp Forceps 50mm Jaw 1 pc Non-Sterile
400202 Eisner™ 5mm Satinsky 40 Clamp Forceps 40mm Jaw 1 pc Non-Sterile
400200 Eisner™ 5mm Satinsky 50 Clamp Forceps 50mm Jaw 1 pc Non-Sterile

45cm WL (Bariatric)

Swipe for more information

45cm WL (Bariatric)
Re-order Description Size Minimum qty Sterile
401204 Eisner™ 5mm Crafoord 35 Clamp Forceps 35mm Jaw 1 pc Non-Sterile
401206 Eisner™ 5mm Crafoord 50 Clamp Forceps 50mm Jaw 1 pc Non-Sterile
401220 Eisner™ 5mm DeBakey Curved Clamp Forceps 50mm Jaw 1 pc Non-Sterile
401221 Eisner™ 5mm DeBakey S-shape Clamp Forceps 50mm Jaw 1 pc Non-Sterile
401202 Eisner™ 5mm Satinsky 40 Clamp Forceps 40mm Jaw 1 pc Non-Sterile
401200 Eisner™ 5mm Satinsky 50 Clamp Forceps 50mm Jaw 1 pc Non-Sterile

Dissectors

Dissector Forcep Inserts

Dissectors

Ø5mm

33cm WL (Standard)

Swipe for more information

33cm WL (Standard)
Re-order Description Size Minimum qty Sterile
400015 Eisner™ 5mm Dolphin Cup Forceps 15mm Jaw 1 pc Non-Sterile
400021 Eisner™ 5mm Dolphin Forceps 14mm Jaw 1 pc Non-Sterile
400087 Eisner™ 5mm Duckbill Rounded Forceps 10mm Jaw 1 pc Non-Sterile
400030 Eisner™ 5mm Geegee Forceps 38mm Jaw 1 pc Non-Sterile
400733 Eisner™ 5mm Kelly Baby Criss Cross Forceps 15mm Jaw 1 pc Non-Sterile
400732 Eisner™ 5mm Kelly Criss Cross Forceps 20mm Jaw 1 pc Non-Sterile
551712 Eisner™ 5mm Maryland DeBakey Forceps 29mm Jaw 1 pc Non-Sterile
400660 Eisner™ 5mm Maryland Long Forceps 24mm Jaw 1 pc Non-Sterile
400731 Eisner™ 5mm Maryland Standard Forceps 20mm Jaw 1 pc Non-Sterile
400661 Eisner™ 5mm Maryland Grasping Dissecting Forceps 17mm Jaw 1 pc Non-Sterile
400735 Eisner™ 5mm Mixter Forceps 13mm Jaw 1 pc Non-Sterile
400016 Eisner™ 5mm Pointed Forceps 22mm Jaw 1 pc Non-Sterile
400342 Eisner™ 5mm Reddick Olsen Forceps 13mm Jaw 1 pc Non-Sterile

45cm WL (Bariatric)

Swipe for more information

45cm WL (Bariatric)
Re-order Description Size Minimum qty Sterile
401015 Eisner™ 5mm Dolphin Cup Forceps 15mm Jaw 1 pc Non-Sterile
401021 Eisner™ 5mm Dolphin Forceps 14mm Jaw 1 pc Non-Sterile
401087 Eisner™ 5mm Duckbill Rounded Forceps 10mm Jaw 1 pc Non-Sterile
401030 Eisner™ 5mm Geegee Forceps 38mm Jaw 1 pc Non-Sterile
401733 Eisner™ 5mm Kelly Baby Criss Cross Forceps 15mm Jaw 1 pc Non-Sterile
401732 Eisner™ 5mm Kelly Criss Cross Forceps 20mm Jaw 1 pc Non-Sterile
401660 Eisner™ 5mm Maryland Long Forceps 24mm Jaw 1 pc Non-Sterile
401731 Eisner™ 5mm Maryland Standard Forceps 20mm Jaw 1 pc Non-Sterile
401661 Eisner™ 5mm Maryland Grasping Dissecting Forceps 17mm Jaw 1 pc Non-Sterile
401735 Eisner™ 5mm Mixter Forceps 13mm Jaw 1 pc Non-Sterile
401016 Eisner™ 5mm Pointed Forceps 22mm Jaw 1 pc Non-Sterile
401342 Eisner™ 5mm Reddick Olsen Forceps 13mm Jaw 1 pc Non-Sterile

Ø10mm

33cm WL (Standard)

Swipe for more information

33cm WL (Standard)
Re-order Description Size Minimum qty Sterile
400076 Eisner™ 10mm Geegee Forceps 52mm Jaw 1 pc Non-Sterile
400739 Eisner™ 10mm Mixter 90o Forceps 28mm Jaw 1 pc Non-Sterile
400741 Eisner™ 10mm Overholt Criss Cross Forceps 25mm Jaw 1 pc Non-Sterile
400737 Eisner™ 10mm Overholt-Mixter Stepdown Forceps 30mm Jaw 1 pc Non-Sterile
400736 Eisner™ 10mm Right Angle Forceps 24mm Jaw 1 pc Non-Sterile

45cm WL (Bariatric)

Swipe for more information

45cm WL (Bariatric)
Re-order Description Size Minimum qty Sterile
401076 Eisner™ 10mm Geegee Forceps 52mm Jaw 1 pc Non-Sterile
401739 Eisner™ 10mm Mixter 90o Forceps 28mm Jaw 1 pc Non-Sterile
401741 Eisner™ 10mm Overholt Criss Cross Forceps 25mm Jaw 1 pc Non-Sterile
401737 Eisner™ 10mm Overholt-Mixter Stepdown Forceps 30mm Jaw 1 pc Non-Sterile
401736 Eisner™ 10mm Right Angle Forceps 24mm Jaw 1 pc Non-Sterile

Fenestrated Dissectors

Fenestrated Dissector Forceps Inserts

Fenestrated Dissectors

Ø5mm

33cm WL (Standard)

Swipe for more information

33cm WL (Standard)
Re-order Description Size Minimum qty Sterile
400040 Eisner™ 5mm Bullnose Fenestrated Forceps 10mm Jaw 1 pc Non-Sterile
400088 Eisner™ 5mm Fenestrated Dissecting Forceps 13mm Jaw 1 pc Non-Sterile
400132 Eisner™ 5mm Fenestrated Strong Forceps 8mm Jaw 1 pc Non-Sterile
400285 Eisner™ 5mm Johan Fenestrated Forceps 17mm Jaw 1 pc Non-Sterile
400291 Eisner™ 5mm Johan Long DA Fen. Forceps 40mm Jaw 1 pc Non-Sterile
400288 Eisner™ 5mm Johan Long SA Fen. Forceps 40mm Jaw 1 pc Non-Sterile
400289 Eisner™ 5mm Johan Loop DA Forceps 21mm Jaw 1 pc Non-Sterile
400284 Eisner™ 5mm Johan Loop SA Forceps 20mm Jaw 1 pc Non-Sterile
400052 Eisner™ 5mm Wave Fenestrated Forceps 14mm Jaw 1 pc Non-Sterile

45cm WL (Bariatric)

Swipe for more information

45cm WL (Bariatric)
Re-order Description Size Minimum qty Sterile
401040 Eisner™ 5mm Bullnose Fenestrated Forceps 10mm Jaw 1 pc Non-Sterile
401088 Eisner™ 5mm Fenestrated Dissecting Forceps 13mm Jaw 1 pc Non-Sterile
401132 Eisner™ 5mm Fenestrated Strong Forceps 8mm Jaw 1 pc Non-Sterile
401285 Eisner™ 5mm Johan Fenestrated Forceps 17mm Jaw 1 pc Non-Sterile
401291 Eisner™ 5mm Johan Long DA Fen. Forceps 40mm Jaw 1 pc Non-Sterile
401288 Eisner™ 5mm Johan Long SA Fen. Forceps 40mm Jaw 1 pc Non-Sterile
401289 Eisner™ 5mm Johan Loop DA Forceps 21mm Jaw 1 pc Non-Sterile
401284 Eisner™ 5mm Johan Loop SA Forceps 20mm Jaw 1 pc Non-Sterile
401052 Eisner™ 5mm Wave Fenestrated Forceps 14mm Jaw 1 pc Non-Sterile

Extractors

Extractor Forcep Inserts

Extractors

Ø5mm

33cm WL (Standard)

Swipe for more information

33cm WL (Standard)
Re-order Description Size Minimum qty Sterile
400048 Eisner™ 5mm Cats Paw Tenaculum Forceps 20mm Jaw 1 pc Non-Sterile
400717 Eisner™ 5mm Davis Claw (Serrated Tooth) Forceps 22mm Jaw 1 pc Non-Sterile
400013 Eisner™ 5mm Eistige Forceps 22mm Jaw 1 pc Non-Sterile
400033 Eisner™ 5mm Eistige SA Forceps 22mm Jaw 1 pc Non-Sterile
400017 Eisner™ 5mm Gripper Forceps 21mm Jaw 1 pc Non-Sterile
400217 Eisner™ 5mm Interlocker Forceps 22mm Jaw 1 pc Non-Sterile
400715 Eisner™ 5mm Ripple Claw (St Andrews) Forceps 23mm Jaw 1 pc Non-Sterile
400364 Eisner™ 5mm Tenaculum Forceps 22mm Jaw 1 pc Non-Sterile

45cm WL (Bariatric)

Swipe for more information

45cm WL (Bariatric)
Re-order Description Size Minimum qty Sterile
401048 Eisner™ 5mm Cats Paw Tenaculum Forceps 20mm Jaw 1 pc Non-Sterile
401717 Eisner™ 5mm Davis Claw (Serrated Tooth) Forceps 22mm Jaw 1 pc Non-Sterile
401013 Eisner™ 5mm Eistige Forceps 22mm Jaw 1 pc Non-Sterile
401033 Eisner™ 5mm Eistige SA Forceps 22mm Jaw 1 pc Non-Sterile
401017 Eisner™ 5mm Gripper Forceps 21mm Jaw 1 pc Non-Sterile
401217 Eisner™ 5mm Interlocker Forceps 22mm Jaw 1 pc Non-Sterile
401715 Eisner™ 5mm Ripple Claw (St Andrews) Forceps 23mm Jaw 1 pc Non-Sterile
401364 Eisner™ 5mm Tenaculum Forceps 22mm Jaw 1 pc Non-Sterile

Ø10mm

33cm WL (Standard)

Swipe for more information

33cm WL (Standard)
Re-order Description Size Minimum qty Sterile
400710 Eisner™ 10mm Claw (Mother in-law) Forceps 30mm Jaw 1 pc Non-Sterile
400753 Eisner™ 10mm Tenaculum Forceps 35mm Jaw 1 pc Non-Sterile

45cm WL (Bariatric)

Swipe for more information

45cm WL (Bariatric)
Re-order Description Size Minimum qty Sterile
401710 Eisner™ 10mm Claw (Mother in-law) Forceps 30mm Jaw 1 pc Non-Sterile
401753 Eisner™ 10mm Tenaculum Forceps 35mm Jaw 1 pc Non-Sterile

Graspers

Grasper Forceps Inserts

Graspers

Ø5mm

33cm WL (Standard)

Swipe for more information

33cm WL (Standard)
Re-order Description Size Minimum qty Sterile
400010 Eisner™ 5mm Alligator Retrograde Forceps 15mm Jaw 1 pc Non-Sterile
400197 Eisner™ 5mm Allis 35 Forceps 35mm Jaw 1 pc Non-Sterile
400089 Eisner™ 5mm Allis Forceps 13mm Jaw 1 pc Non-Sterile
400011 Eisner™ 5mm Allis SA Forceps 13mm Jaw 1 pc Non-Sterile
400330 Eisner™ 5mm Allis Long Forceps 28mm Jaw 1 pc Non-Sterile
400130 Eisner™ 5mm Babcock Duval Forceps 25mm Jaw 1 pc Non-Sterile
400251 Eisner™ 5mm Babcock SA Forceps 12mm Jaw 1 pc Non-Sterile
400250 Eisner™ 5mm Babcock Super Fine Paddle Forceps 30mm Jaw 1 pc Non-Sterile
400252 Eisner™ 5mm Babcock Traditional Forceps 20mm Jaw 1 pc Non-Sterile
400009 Eisner™ 5mm Bonnies Forceps 15mm Jaw 1 pc Non-Sterile
400355 Eisner™ 5mm Bullnose Flat Face Forceps 13mm Jaw 1 pc Non-Sterile
400127 Eisner™ 5mm Bullnose Forceps 13mm Jaw 1 pc Non-Sterile
400002 Eisner™ 5mm Bullnose Long Forceps 22mm Jaw 1 pc Non-Sterile
400001 Eisner™ 5mm Bullnose Short Jaw Forceps 11mm Jaw 1 pc Non-Sterile
400201 Eisner™ 5mm Cobra Forceps 13mm Jaw 1 pc Non-Sterile
400019 Eisner™ 5mm Crocodile Forceps 17mm Jaw 1 pc Non-Sterile
400004 Eisner™ 5mm Kocher Forceps 15mm Jaw 1 pc Non-Sterile
400136 Eisner™ 5mm McKearnan Standard Forceps 15mm Jaw 1 pc Non-Sterile
400025 Eisner™ 5mm McKearnan Medium Forceps 20mm Jaw 1 pc Non-Sterile
400137 Eisner™ 5mm McKearnan Long Forceps 22mm Jaw 1 pc Non-Sterile
400036 Eisner™ 5mm Rat Tooth Forceps 12mm Jaw 1 pc Non-Sterile
400042 Eisner™ 5mm Pin Grasping Forceps 12mm Jaw 1 pc Non-Sterile
400029 Eisner™ 5mm Tungsten Carbide (TC) Grasping Forceps 16mm Jaw 1 pc Non-Sterile

45cm WL (Bariatric)

Swipe for more information

45cm WL (Bariatric)
Re-order Description Size Minimum qty Sterile
401010 Eisner™ 5mm Alligator Retrograde Forceps 15mm Jaw 1 pc Non-Sterile
401197 Eisner™ 5mm Allis 35 Forceps 35mm Jaw 1 pc Non-Sterile
401089 Eisner™ 5mm Allis Forceps 13mm Jaw 1 pc Non-Sterile
401011 Eisner™ 5mm Allis SA Forceps 13mm Jaw 1 pc Non-Sterile
401330 Eisner™ 5mm Allis Long Forceps 28mm Jaw 1 pc Non-Sterile
401130 Eisner™ 5mm Babcock Duval Forceps 25mm Jaw 1 pc Non-Sterile
401251 Eisner™ 5mm Babcock SA Forceps 12mm Jaw 1 pc Non-Sterile
401250 Eisner™ 5mm Babcock Super Fine Paddle Forceps 30mm Jaw 1 pc Non-Sterile
401252 Eisner™ 5mm Babcock Traditional Forceps 20mm Jaw 1 pc Non-Sterile
401009 Eisner™ 5mm Bonnies Forceps 15mm Jaw 1 pc Non-Sterile
401355 Eisner™ 5mm Bullnose Flat Face Forceps 13mm Jaw 1 pc Non-Sterile
401127 Eisner™ 5mm Bullnose Forceps 13mm Jaw 1 pc Non-Sterile
401002 Eisner™ 5mm Bullnose Long Forceps 22mm Jaw 1 pc Non-Sterile
401001 Eisner™ 5mm Bullnose Short Jaw Forceps 11mm Jaw 1 pc Non-Sterile
401201 Eisner™ 5mm Cobra Forceps 13mm Jaw 1 pc Non-Sterile
401019 Eisner™ 5mm Crocodile Forceps 17mm Jaw 1 pc Non-Sterile
401004 Eisner™ 5mm Kocher Forceps 15mm Jaw 1 pc Non-Sterile
401136 Eisner™ 5mm McKearnan Standard Forceps 15mm Jaw 1 pc Non-Sterile
401025 Eisner™ 5mm McKearnan Medium Forceps 20mm Jaw 1 pc Non-Sterile
401137 Eisner™ 5mm McKearnan Long Forceps 22mm Jaw 1 pc Non-Sterile
401036 Eisner™ 5mm Rat Tooth Forceps 12mm Jaw 1 pc Non-Sterile
401042 Eisner™ 5mm Pin Grasping Forceps 12mm Jaw 1 pc Non-Sterile
401029 Eisner™ 5mm Tungsten Carbide (TC) Grasping Forceps 16mm Jaw 1 pc Non-Sterile

Ø10mm

33cm WL (Standard)

Swipe for more information

33cm WL (Standard)
Re-order Description Size Minimum qty Sterile
400295 Eisner™ 10mm Anvil Grasping Forceps 30mm Jaw 1 pc Non-Sterile
400078 Eisner™ 10mm Babcock Forceps 30mm Jaw 1 pc Non-Sterile
400084 Eisner™ 10mm Collin-Duval Grasping Forceps 32mm Jaw 1 pc Non-Sterile
400280 Eisner™ 10mm Duval Long Forceps 43mm Jaw 1 pc Non-Sterile
400085 Eisner™ 10mm Pennington-Collin Forceps 38mm Jaw 1 pc Non-Sterile

45cm WL (Bariatric)

Swipe for more information

45cm WL (Bariatric)
Re-order Description Size Minimum qty Sterile
401295 Eisner™ 10mm Anvil Grasping Forceps 30mm Jaw 1 pc Non-Sterile
401078 Eisner™ 10mm Babcock Forceps 30mm Jaw 1 pc Non-Sterile
401084 Eisner™ 10mm Collin-Duval Grasping Forceps 32mm Jaw 1 pc Non-Sterile
401280 Eisner™ 10mm Duval Long Forceps 43mm Jaw 1 pc Non-Sterile
401085 Eisner™ 10mm Pennington-Collin Forceps 38mm Jaw 1 pc Non-Sterile

Grasper Scissors

Grasper Scissor Forceps Inserts

Grasper Scissors

Ø5mm

33cm WL (Standard)

Swipe for more information

33cm WL (Standard)
Re-order Description Size Minimum qty Sterile
400331 Eisner™ 5mm Knot Pusher Scissor Insert 16mm Jaw 1 pc Non-Sterile

45cm WL (Bariatric)

Swipe for more information

45cm WL (Bariatric)
Re-order Description Size Minimum qty Sterile
401331 Eisner™ 5mm Knot Pusher Scissor Insert 16mm Jaw 1 pc Non-Sterile

Ovary/Tubal

Ovary/Tubal Forceps Inserts

Ovary/Tubal

Ø5mm

33cm WL (Standard)

Swipe for more information

33cm WL (Standard)
Re-order Description Size Minimum qty Sterile
400046 Eisner™ 5mm Blunt Nose Tubal Forceps 20mm Jaw 1 pc Non-Sterile
400045 Eisner™ 5mm Tubal Forceps 16mm Jaw 1 pc Non-Sterile

45cm WL (Bariatric)

Swipe for more information

45cm WL (Bariatric)
Re-order Description Size Minimum qty Sterile
401046 Eisner™ 5mm Blunt Nose Tubal Forceps 20mm Jaw 1 pc Non-Sterile
401045 Eisner™ 5mm Tubal Forceps 16mm Jaw 1 pc Non-Sterile