Elastomeric plunger tip for a syringe
First Claim
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1. An elastomeric plunger tip particularly suited for a blood sampling syringe, said tip comprising a compressible, elastomeric material having a durometer of about 35 to about 75 when measured on the Shore A scale, having the ability to retain its resilience at temperatures at least as low as 0°
- C., and being provided with a peripheral annular wiper lip extending axially forwardly and radially outwardly so that it forms the sole sealing element when said plunger tip if inserted in said syringe, said plunger tip providing the syringe with a self-aspirating characteristic when used to sample arterial blood while maintaining an effective seal for containing the blood sample.
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Accused Products
Abstract
An elastomeric plunger tip for syringes comprises a compressible, elastomeric material having a durometer of about 35 to about 75 when measured on the Shore A scale and maintains its resilience at temperatures at least as low as 0° C. The plunger tip is provided with a peripheral annular wiper lip extending axially forwardly and radially outwardly into sealing contact with the syringe barrel.
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Citations
44 Claims
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1. An elastomeric plunger tip particularly suited for a blood sampling syringe, said tip comprising a compressible, elastomeric material having a durometer of about 35 to about 75 when measured on the Shore A scale, having the ability to retain its resilience at temperatures at least as low as 0°
- C., and being provided with a peripheral annular wiper lip extending axially forwardly and radially outwardly so that it forms the sole sealing element when said plunger tip if inserted in said syringe, said plunger tip providing the syringe with a self-aspirating characteristic when used to sample arterial blood while maintaining an effective seal for containing the blood sample.
- View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A compressible and elastomeric syringe plunger tip particularly suited for a blood sampling syringe comprising a generally cylindrical main portion, an integral annular elastically deformable wiper extending peripherally radially outwardly and axially forwardly from a forward portion thereof at an acute angle to the longitudinal center axis of said tip and terminating at the outer edge thereof in a wiping edge, when used in a syringe assembly said annular wiper being the sole sealing element between said plunger tip and the syringe, said tip comprising a compressible, elastomeric material having a durometer of about 35 to about 75 when measured on the Shore A scale, having the ability to retain its resilience at temperatures at least as low as 0°
- C., and being provided with a peripheral annular wiper lip extending axially forwardly and radially outwardly so that it forms the sole sealing element when said plunger tip is inserted in said syringe, said plunger tip providing the syringe with a self-aspirating characteristic when used to sample arterial blood while maintaining an effective seal for containing the blood sample.
- View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A compressible and elastomeric syringe plunger tip comprising a generally cylindrical main portion, an integral annular elastically deformable wiper extending peripherally radially outwardly and axially forwardly from a forward portion thereof at an acute angle to the longitudinal center axis of said tip and terminating at the outer edge thereof in a wiping edge, when used in a syringe assembly said annular wiper being the sole sealing element between said plunger tip and the syringe, said tip comprising a compressible, elastomeric material having a durometer of about 35 to about 75 when measured on the Shore A scale, having the ability to retain its resilience at temperatures at least as low as 0°
- C., and being provided with a peripheral annular wiper lip extending axially forwardly and radially outwardly so that it forms the sole sealing element when said plunger tip is inserted in said syringe, said plunger tip having a plurality of raised portions speed circumferentially around said plunger tip and located at the rearward portion of said plunger tip, said raised portions engaging the wall of said syringe, when the plunger tip is inserted therein, to prevent canting of said plunger tip.
- View Dependent Claims (25, 26, 27, 28)
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29. A self-aspirating disposable syringe assembly particularly suited because of the low force requirement for the operation thereof to be used for obtaining a blood sample from a patient comprising a barrel having a cylindrical inner wall and a plunger comprising a plunger stem and a compressible, elastomeric, generally cylindrical plunger tip of lesser diameter than the inner wall of said barrel, said plunger tip having an integral, annular, elastically deformable wiper extending peripherally radially outwardly and axially forwardly from said plunger tip at a forward portion thereof at an acute angle to the longitudinal center axis of said plunger tip and terminating at the other edge thereof in a wiping edge thereof in a wiping edge having a minimal diameter slightly in excess of the diameter of the inner wall of said barrel, thereby forming a sealing engagement with the inner wall of said barrel, said annular wiper being the sole sealing element between said plunger tip and said wall, said plunger tip comprising a compressible, elastomeric material having a durometer of about 35 to about 75 when measured on the Shore A scale, having the ability to retain its resilience at temperatures at least as low as 0°
- C., and being provided with a peripheral annular wiper lip extending axially forwardly and radially outwardly so that it forms the sole sealing element when said plunger tip is inserted in said syringe, said plunger tip providing the syringe with a self-aspirating characteristic when used to sample arterial blood while maintaining an effective seal for containing the blood sample.
- View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A disposable syringe assembly particularly suited because of the low force requirement for the operation thereof to be used for obtaining a blood sample from a patient comprising a barrel having a cylindrical inner wall and a plunger comprising a plunger stem and a compressible, elastomeric, generally cylindrical plunger tip of lesser diameter than the inner wall of said barrel, said plunger tip having an integral, annular, elastically deformable wiper extending peripherally radially outwardly and axially forwardly from said plunger tip at a forward portion thereof at an acute angle to the longitudinal center axis of said plunger tip and terminating at the outer edge thereof in a wiping edge having a minimal diameter slightly in excess of the diameter of the inner wall of said barrel, thereby forming a sealing engagement with the inner wall of said barrel, said annular wiper being the sole sealing element between said plunger tip and said wall, said plunger tip having a plurality of raised portions spaced circumferentially around said plunger tip and located at the rearward portion of said plunger tip, said raised portions engaging said inner wall of said barrel with a minimum of frictional contact to prevent canting of said plunger tip in said barrel, said plunger tip comprising a compressible, elastomeric material having a durometer of about 35 to 75 when measured on the Shore A scale, having the ability to retain its resilience at temperatures at least as low as 0°
- C., and being provided with a peripheral annular wiper lip extending axially forwardly and radially outwardly so that it forms the sole sealing element when said plunger tip is inserted in said syringe, said syringe assembly being prefilled with anticoagulant.
- View Dependent Claims (41, 42, 43, 44)
Specification