Non-reusable retractable safety syringe

Claim 2

A non-reusable retractable safety syringe comprising: (a) a cylindrical barrel having first and second barrel ends and an inside diameter wall there between; (b) a chamber for receipt of fluid within said barrel and between said first and second barrel ends; (c) a plastic hollow plunger having a distal end, said plunger being extendable into said barrel through the first end of said barrel, and selectively movable from expanded position toward an expended position; (d) means for permitting the plunger to thereafter move to a collapsed position relative to the second end of the barrel; (e) a hollow needle in secured relationship relative to the second end of the barrel; (f) biasing means in initially secured relationship relative to the second end of the barrel for biasing the needle toward the hollow plunger; (g) means for directing forward pressure upon said plunger; (h) sealing means including an elastomeric sealing member engaged to one end of the plunger for slidable sealing engagement with the inside diameter wall of the barrel; (i) means for telescopically engaging the plunger distal end to the sealing means and including a series of radially spaced breakable support struts having an external diameter and disposed around and to the distal end of the plunger, the sealing means including a tubular housing having an internal diameter larger than the external diameter of the support struts, whereby the support struts selectively secure the plunger to the sealing means, and upon forward pressure being applied to the plunger sufficient to break the struts, the plunger may thereafter telescopically move within the external diameter of the tubular housing from the expended position to the collapsed position, and (j) a cutting tip carried by the plunger for cutting through the sealing member such that the biasing means thereafter releases the needle into the plunger when the plunger is at the collapsed position relative to the second end of the barrel.

Claim 3

A non-reusable retractable safety syringe, comprising: (a) a cylindrical barrel having first and second barrel ends and an inside diameter wall there between; (b) a chamber for receipt of fluid within the barrel and between the first and second barrel ends; (c) a plastic hollow plunger extendable into the barrel through the first end of the barrel, and selectively movable from expanded position toward an expended position and thereafter to a fully collapsed position relative to the second end of the barrel; (d) a hollow needle in secured relationship relative to the second end of the barrel; (e) biasing means in initially secured relationship relative to the second end of the barrel for biasing the needle toward the hollow plunger; (f) means for directing forward pressure upon the plunger; (g) sealing means including an elastomeric sealing member engaged to one end of the plunger when the plunger is in the expanded position and when the plunger is moving toward the expended position for slidable sealing engagement with the inside diameter wall of the barrel, the sealing means being disengageable from the one end of the plunger during movement of the plunger toward, but prior to, the plunger being placed at the collapsed position; (h) means for telescopically engaging the plunger distal end to the sealing means and including a series of radially spaced breakable support struts having an external diameter and disposed around and to the distal end of the plunger, the sealing means including a tubular housing having an internal diameter larger than the external diameter of the support struts, whereby the support struts selectively secure the plunger to the sealing means, and upon forward pressure being applied to the plunger sufficient to break the struts, the plunger may thereafter telescopically move within the external diameter of the tubular housing from the expended position to the collapsed position; and (i) a cutting tip carried by the plunger for cutting through the sealing member such that the biasing means releases the needle into the plunger when the plunger is at the collapsed position relative to the second end of the barrel.

Claim 4

A non-reusable retractable safety syringe, comprising: (a) a cylindrical barrel having first and second barrel ends and an inside diameter wall there between; (b) a chamber for receipt of fluid within the barrel and between the first and second barrel ends; (c) a plastic hollow plunger extendable into the barrel through the first end of the barrel, and selectively movable from expanded position toward an expended position and thereafter to a fully collapsed position relative to the second end of the barrel; (d) a hollow needle in secured relationship relative to the second end of the barrel; (e) biasing means in initially secured relationship relative to the second end of the barrel for biasing the needle toward the hollow plunger; (f) means for directing forward pressure upon the plunger; (g) sealing means including an elastomeric sealing member engaged to one end of the plunger when the plunger is in the expanded position and when the plunger is moving toward the expended position for slidable sealing engagement with the inside diameter wall of the barrel, the sealing means being disengageable from the one end of the plunger during movement of the plunger toward, but prior to, the plunger being placed at the collapsed position; (h) means for telescopically engaging the plunger distal end to the sealing means and including a series of radially spaced breakable support struts having an external diameter and disposed around and to the distal end of the plunger, the sealing means including a tubular housing having an internal diameter larger than the external diameter of the support struts, whereby the support struts selectively secure the plunger to the sealing means, and upon forward pressure being applied to the plunger sufficient to break the struts, the plunger may thereafter telescopically move within the external diameter of the tubular housing from the expended position to the collapsed position; and (i) a cutting tip carried by the plunger for cutting through the sealing member such that the biasing means releases the needle into the plunger when the plunger is at the collapsed position relative to the second end of the barrel.

Claim 5

A non-reusable retractable safety syringe comprising: (a) a cylindrical barrel having first and second barrel ends and an inside diameter wall there between; (b) a chamber for receipt of fluid within the barrel and between the first and second barrel ends; (c) a plastic hollow plunger extendable into the barrel through the first end of the barrel, and selectively movable from an expanded position toward an expended position, and thereafter to a collapsed position relative to the second end of the barrel; (d) a hollow needle in secured relationship relative to the second end of the barrel; (e) biasing means in initially secured relationship relative to the second end of the barrel for biasing the needle toward the hollow plunger; (f) means for directing forward pressure upon the plunger; (g) sealing means including an elastomeric sealing member engaged to one end of the plunger for slidable sealing engagement with the inside diameter watt of the barrel; (h) a cutting tip carried by the plunger for cutting through the sealing member such that the biasing means thereafter releases the needle into the plunger when the plunger is at the collapsed position relative to the second end of the barrel; (i) means for telescopically engaging the plunger distal end to the sealing means and including a series of radially spaced breakable support struts having an external diameter and disposed around and to the distal end of the plunger, the sealing means including a tubular housing having an internal diameter larger than the external diameter of the support struts, whereby the support struts selectively secure the plunger to the sealing means, and upon forward pressure being applied to the plunger sufficient to break the struts, the plunger may thereafter telescopically move within the external diameter of the tubular housing from the expended position to the collapsed position; and (j) locking means having a member on each of the barrel and plunger to lock the plunger relative to the barrel when the plunger is placed in the collapsed position relative to the second end of the barrel so that the plunger may not thereafter move within the barrel toward the expanded position.

Claim 6

A non-reusable retractable safety syringe comprising: (a) a cylindrical barrel having first and second barrel ends and an inside diameter wall there between; (b) a chamber for receipt of fluid within the barrel and between the first and second barrel ends; (c) a plastic hollow plunger extendable into the barrel through the first end of the barrel, and selectively movable from an expanded position toward an expended position, and thereafter to a collapsed position relative to the second end of the barrel; (d) a hollow needle in secured relationship relative to the second end of the barrel; (e) biasing means in initially secured relationship relative to the second end of the barrel for biasing the needle toward the hollow plunger; (f) means for directing forward pressure upon the plunger; (g) sealing means including an elastomeric sealing member engaged to one end of the plunger for slidable sealing engagement with the inside diameter watt of the barrel; (h) a cutting tip carried by the plunger for cutting through the sealing member such that the biasing means thereafter releases the needle into the plunger when the plunger is at the collapsed position relative to the second end of the barrel; (i) means for telescopically engaging the plunger distal end to the sealing means and including a series of radially spaced breakable support struts having an external diameter and disposed around and to the distal end of the plunger, the sealing means including a tubular housing having an internal diameter larger than the external diameter of the support struts, whereby the support struts selectively secure the plunger to the sealing means, and upon forward pressure being applied to the plunger sufficient to break the struts, the plunger may thereafter telescopically move within the external diameter of the tubular housing from the expended position to the collapsed position; and (j) locking means having a member on each of the barrel and plunger to lock the plunger relative to the barrel when the plunger is placed in the collapsed position relative to the second end of the barrel so that the plunger may not thereafter move within the barrel toward the expanded position.

Claim 7

A non-reusable retractable safety syringe comprising: (a) a cylindrical barrel having first and second barrel ends and an inside diameter wall there between; (b) a chamber for receipt of fluid within the barrel and between the first and second barrel ends; (c) a plastic hollow plunger extendable into the barrel through the first end of the barrel, and selectively movable from an expanded position toward an expended position, and thereafter to a collapsed position relative to the second end of the barrel; (d) a hollow needle in secured relationship relative to the second end of the barrel; (e) biasing means in initially secured relationship relative to the second end of the barrel for biasing the needle toward the hollow plunger; (f) means for directing forward pressure upon the plunger; (g) sealing means including an elastomeric sealing member engaged to one end of the plunger when the plunger is the expanded position and when the plunger is moving toward the expended position, for slidable sealing engagement with the inside diameter wall of the barrel, the sealing means being disengageable from the one end of the plunger during movement of the plunger after reaching the expended position and when the plunger is in thereafter moving toward, but prior to, the plunger being placed at the collapsed position; (h) a cutting tip carried by the plunger for cutting through the sealing member such that the biasing means thereafter releases the needle into the plunger when the plunger is at the collapsed position relative to the second end of the barrel; (i) means for telescopically engaging the plunger distal end to the sealing means and including a series of radially spaced breakable support struts having an external diameter and disposed around and to the distal end of the plunger, the sealing means including a tubular housing having an internal diameter larger than the external diameter of the support struts, whereby the support struts selectively secure the plunger to the sealing means, and upon forward pressure being applied to the plunger sufficient to break the struts, the plunger may thereafter telescopically move within the external diameter of the tubular housing from the expended position to the collapsed position; and (i) locking means having a member on each of the barrel and plunger to lock the plunger relative to the barrel when the plunger is placed in the collapsed position relative to the second end the barrel so that the plunger may not thereafter move within the barrel toward the expanded position.

Claim 8

A non-reusable retractable safety syringe comprising: (a) a cylindrical barrel having first and second barrel ends and an inside diameter wall there between; (b) a chamber for receipt of fluid within the barrel and between the first and second barrel ends; (c) a plastic hollow plunger extendable into the barrel through the first end of the barrel, and selectively movable from an expanded position toward an expended position, and thereafter to a collapsed position relative to the second end of the barrel; (d) a hollow needle in secured relationship relative to the second end of the barrel; (e) biasing means in initially secured relationship relative to the second end of the barrel for biasing the needle toward the hollow plunger; (f) means for directing forward pressure upon the plunger; (g) sealing means including an elastomeric sealing member engaged to one end of the plunger when the plunger is the expanded position and when the plunger is moving toward the expended position, for slidable sealing engagement with the inside diameter wall of the barrel, the sealing means being disengageable from the one end of the plunger during movement of the plunger after reaching the expended position and when the plunger is in thereafter moving toward, but prior to, the plunger being placed at the collapsed position; (h) a cutting tip carried by the plunger for cutting through the sealing member such that the biasing means thereafter releases the needle into the plunger when the plunger is at the collapsed position relative to the second end of the barrel; (i) means for telescopically engaging the plunger distal end to the sealing means and including a series of radially spaced breakable support struts having an external diameter and disposed around and to the distal end of the plunger, the sealing means including a tubular housing having an internal diameter larger than the external diameter of the support struts, whereby the support struts selectively secure the plunger to the sealing means, and upon forward pressure being applied to the plunger sufficient to break the struts, the plunger may thereafter telescopically move within the external diameter of the tubular housing from the expended position to the collapsed position; and (i) locking means having a member on each of the barrel and plunger to lock the plunger relative to the barrel when the plunger is placed in the collapsed position relative to the second end the barrel so that the plunger may not thereafter move within the barrel toward the expanded position.

Claim 9

A non-reusable retractable safety syringe comprising: (a) a cylindrical barrel having first and second barrel ends and an inside diameter wall there between; (b) a chamber for receipt of fluid within said barrel and between said first and second barrel ends; (c) a plastic hollow plunger extendable into said barrel through the first end of said barrel, and selectively movable from expanded position toward an expended position, and thereafter to a collapsed position relative to the second end of the barrel; (d) a hollow needle in secured relationship relative to the second end of the barrel; (e) biasing means in initially secured relationship relative to the second end of the barrel for biasing the needle toward the hollow plunger; (f) means for directing forward pressure upon said plunger; (g) sealing means including an elastomeric sealing member and engaged to one end of the plunger for slidable sealing engagement with the inside diameter wall of the barrel; (h) means for telescopically engaging the plunger distal end to the sealing means and including a series of radially spaced breakable support struts having an external diameter and disposed around and to the distal end of the plunger, the sealing means including a tubular housing having an internal diameter larger than the external diameter of the support struts, whereby the support struts selectively secure the plunger to the sealing means, and upon forward pressure being applied to the plunger sufficient to break the struts, the plunger may thereafter telescopically move within the external diameter of the tubular housing from the expended position to the collapsed position; and (i) a cutting tip for cutting through the sealing member such that the biasing means thereafter releases the needle into the plunger when the plunger is at the collapsed position relative to the second end of the barrel.

Claim 10

A non-reusable retractable safety syringe comprising: (a) a cylindrical barrel having first and second barrel ends and an inside diameter wall there between; (b) a chamber for receipt of fluid within said barrel and between said first and second barrel ends; (c) a plastic hollow plunger extendable into said barrel through the first end of said barrel, and selectively movable from expanded position toward an expended position, and thereafter to a collapsed position relative to the second end of the barrel; (d) a hollow needle in secured relationship relative to the second end of the barrel; (e) biasing means in initially secured relationship relative to the second end of the barrel for biasing the needle toward the hollow plunger; (f) means for directing forward pressure upon said plunger; (g) sealing means including an elastomeric sealing member and engaged to one end of the plunger for slidable sealing engagement with the inside diameter wall of the barrel; (h) means for telescopically engaging the plunger distal end to the sealing means and including a series of radially spaced breakable support struts having an external diameter and disposed around and to the distal end of the plunger, the sealing means including a tubular housing having an internal diameter larger than the external diameter of the support struts, whereby the support struts selectively secure the plunger to the sealing means, and upon forward pressure being applied to the plunger sufficient to break the struts, the plunger may thereafter telescopically move within the external diameter of the tubular housing from the expended position to the collapsed position; and (i) a cutting tip for cutting through the sealing member such that the biasing means thereafter releases the needle into the plunger when the plunger is at the collapsed position relative to the second end of the barrel.

Claim 11

A non-reusable retractable safety syringe comprising: (a) a cylindrical barrel having first and second barrel ends and an inside diameter wall there between; (b) a chamber for receipt of fluid within said barrel and between said first and second barrel ends; (c) a plastic hollow plunger extendable into said barrel through the first end of said barrel, and including means for permitting the plunger to be selectively movable from expanded position toward an expended position, and having means for permitting the plunger to thereafter move to a collapsed position relative to the second end of the barrel; (d) a hollow needle in secured relationship relative to the second end of the barrel; (e) biasing means in initially secured relationship relative to the second end of the barrel for biasing the needle toward the hollow plunger; (f) means for directing forward pressure upon said plunger; (g) sealing means including an elastomeric sealing member and engaged to one end of the plunger for slidable sealing engagement with the inside diameter wall of the barrel; (h) means for telescopically engaging the plunger distal end to the sealing means and including a series of radially spaced breakable support struts having an external diameter and disposed around and to the distal end of the plunger, the sealing means including a tubular housing having an internal diameter larger than the external diameter of the support struts, whereby the support struts selectively secure the plunger to the sealing means, and upon forward pressure being applied to the plunger sufficient to break the struts, the plunger may thereafter telescopically move within the external diameter of the tubular housing from the expended position to the collapsed position; and (h) a cutting tip carried by the plunger for cutting through the sealing member such that the biasing means thereafter releases the needle into the plunger when the plunger is at the collapsed position relative to the second end of the barrel.

Claim 12

A non-reusable retractable safety syringe comprising: (a) a cylindrical barrel having first and second barrel ends and an inside diameter wall there between; (b) a chamber for receipt of fluid within said barrel and between said first and second barrel ends; (c) a plastic hollow plunger extendable into said barrel through the first end of said barrel, and including means for permitting the plunger to be selectively movable from expanded position toward an expended position, and having means for permitting the plunger to thereafter move to a collapsed position relative to the second end of the barrel; (d) a hollow needle in secured relationship relative to the second end of the barrel; (e) biasing means in initially secured relationship relative to the second end of the barrel for biasing the needle toward the hollow plunger; (f) means for directing forward pressure upon said plunger; (g) sealing means including an elastomeric sealing member and engaged to one end of the plunger for slidable sealing engagement with the inside diameter wall of the barrel; (h) means for telescopically engaging the plunger distal end to the sealing means and including a series of radially spaced breakable support struts having an external diameter and disposed around and to the distal end of the plunger, the sealing means including a tubular housing having an internal diameter larger than the external diameter of the support struts, whereby the support struts selectively secure the plunger to the sealing means, and upon forward pressure being applied to the plunger sufficient to break the struts, the plunger may thereafter telescopically move within the external diameter of the tubular housing from the expended position to the collapsed position; and (h) a cutting tip carried by the plunger for cutting through the sealing member such that the biasing means thereafter releases the needle into the plunger when the plunger is at the collapsed position relative to the second end of the barrel.

Claim 13

A non-reusable retractable safety syringe comprising: (a) a cylindrical barrel having first and second barrel ends and an inside diameter wall there between; (b) a chamber for receipt of fluid within said barrel and between said first and second barrel ends; (c) a plastic hollow plunger extendable into said barrel through the first end of said barrel, and selectively movable from expanded position toward an expended position, and having means for permitting the plunger to thereafter move to a collapsed position relative to the second end of the barrel; (d) a hollow needle in secured relationship relative to the second end of the barrel; (e) biasing means in initially secured relationship relative to the second end of the barrel for biasing the needle toward the hollow plunger; (f) means for directing forward pressure upon said plunger; (g) sealing means including an elastomeric sealing member and engaged to one end of the plunger for slidable sealing engagement with the inside diameter wall of the barrel; (h) means for telescopically engaging the plunger distal end to the sealing means and including a series of radially spaced breakable support struts having an external diameter and disposed around and to the distal end of the plunger, the sealing means including a tubular housing having an internal diameter larger than the external diameter of the support struts, whereby the support struts selectively secure the plunger to the sealing means, and upon forward pressure being applied to the plunger sufficient to break the struts, the plunger may thereafter telescopically move within the external diameter of the tubular housing from the expended position to the collapsed position, and (i) a cutting tip defined on the plunger for cutting through the sealing member such that the biasing means thereafter releases the needle into the plunger when the plunger is at the collapsed position relative to the second end of the barrel.

Claim 14

A non-reusable retractable safety syringe comprising: (a) a cylindrical barrel having first and second barrel ends and an inside diameter wall there between; (b) a chamber for receipt of fluid within said barrel and between said first and second barrel ends; (c) a plastic hollow plunger extendable into said barrel through the first end of said barrel, and selectively movable from expanded position toward an expended position, and having means for permitting the plunger to thereafter move to a collapsed position relative to the second end of the barrel; (d) a hollow needle in secured relationship relative to the second end of the barrel; (e) biasing means in initially secured relationship relative to the second end of the barrel for biasing the needle toward the hollow plunger; (f) means for directing forward pressure upon said plunger; (g) sealing means including an elastomeric sealing member and engaged to one end of the plunger for slidable sealing engagement with the inside diameter wall of the barrel; (h) means for telescopically engaging the plunger distal end to the sealing means and including a series of radially spaced breakable support struts having an external diameter and disposed around and to the distal end of the plunger, the sealing means including a tubular housing having an internal diameter larger than the external diameter of the support struts, whereby the support struts selectively secure the plunger to the sealing means, and upon forward pressure being applied to the plunger sufficient to break the struts, the plunger may thereafter telescopically move within the external diameter of the tubular housing from the expended position to the collapsed position, and (i) a cutting tip defined on the plunger for cutting through the sealing member such that the biasing means thereafter releases the needle into the plunger when the plunger is at the collapsed position relative to the second end of the barrel.

Claim 15

A non-reusable retractable safety syringe comprising: (a) a cylindrical barrel having first and second barrel ends and an inside diameter wall there between; (b) a chamber for receipt of fluid within said barrel and between said first and second barrel ends; (c) a plastic hollow plunger extendable into said barrel through the first end of said barrel, and selectively movable from expanded position toward an expended position, and having means for permitting the plunger to thereafter move to a collapsed position relative to the second end of the barrel; (d) a hollow needle in secured relationship relative to the second end of the barrel; (e) biasing means in initially secured relationship relative to the second end of the barrel for biasing the needle toward the hollow plunger; (f) means for directing forward pressure upon said plunger; (g) sealing means including an elastomeric sealing member and engaged to one end of the plunger for slidable sealing engagement with the inside diameter wall of the barrel; (h) means for telescopically engaging the plunger distal end to the sealing means and including a series of radially spaced breakable support struts having an external diameter and disposed around and to the distal end of the plunger, the sealing means including a tubular housing having an internal diameter larger than the external diameter of the support struts, whereby the support struts selectively secure the plunger to the sealing means, and upon forward pressure being applied to the plunger sufficient to break the struts, the plunger may thereafter telescopically move within the external diameter of the tubular housing from the expended position to the collapsed position; and (i) a cutting tip carried by the plunger for cutting through the sealing member such that the biasing means thereafter releases the needle into the plunger when the plunger is at the collapsed position relative to the second end of the barrel, said cutting tip having a cutting configuration at its distal end.

Claim 16

A non-reusable retractable safety syringe comprising: (a) a cylindrical barrel having first and second barrel ends and an inside diameter wall there between; (b) a chamber for receipt of fluid within said barrel and between said first and second barrel ends; (c) a plastic hollow plunger extendable into said barrel through the first end of said barrel, and selectively movable from expanded position toward an expended position, and having means for permitting the plunger to thereafter move to a collapsed position relative to the second end of the barrel; (d) a hollow needle in secured relationship relative to the second end of the barrel; (e) biasing means in initially secured relationship relative to the second end of the barrel for biasing the needle toward the hollow plunger; (f) means for directing forward pressure upon said plunger; (g) sealing means including an elastomeric sealing member and engaged to one end of the plunger for slidable sealing engagement with the inside diameter wall of the barrel; (h) means for telescopically engaging the plunger distal end to the sealing means and including a series of radially spaced breakable support struts having an external diameter and disposed around and to the distal end of the plunger, the sealing means including a tubular housing having an internal diameter larger than the external diameter of the support struts, whereby the support struts selectively secure the plunger to the sealing means, and upon forward pressure being applied to the plunger sufficient to break the struts, the plunger may thereafter telescopically move within the external diameter of the tubular housing from the expended position to the collapsed position; and (i) a cutting tip carried by the plunger for cutting through the sealing member such that the biasing means thereafter releases the needle into the plunger when the plunger is at the collapsed position relative to the second end of the barrel, said cutting tip having a cutting configuration at its distal end.

Claim 17

The non-reusable retractable safety-syringe of claim 8 wherein said cutting configuration is pyramid-like with equa-distant sides extending to the center distal point.

Claim 18

A non-reusable retractable safety syringe comprising: (a) a cylindrical barrel having first and second barrel ends and an inside diameter wall there between; (b) a chamber for receipt of fluid within said barrel and between said first and second barrel ends; (c) a plastic hollow plunger having a distal end, said plunger being extendable into said barrel through the first end of said barrel, and selectively movable from expanded position toward an expended position; (d) means for permitting the plunger to thereafter move to a collapsed position relative to the second end of the barrel; (e) a hollow needle in secured relationship relative to the second end of the barrel; (f) biasing means in initially secured relationship relative to the second end of the barrel for biasing the needle toward the hollow plunger; (g) means for directing forward pressure upon said plunger; (h) sealing means including an elastomeric sealing member for slidable sealing engagement with the inside diameter wall of the barrel, said sealing means further including a tubular housing for receipt and carriage of said sealing means therearound, said tubular housing being initially engaged with, but selectively permanently disengagable from, the distal end of the plunger after the plunger is moved to the expended position; (i) means for engaging the plunger distal end to the tubular housing of the sealing means and for permitting selective telescopic movements of the plunger distal end into the tubular housing; and (j) a cutting tip carried by the plunger for cutting through the sealing members such that the biasing means thereafter releases the needle into the plunger when the plunger is at the collapsed position relative to the second end of the barrel.

Claim 19

A non-reusable retractable safety syringe comprising: (a) a cylindrical barrel having first and second barrel ends and an inside diameter wall there between; (b) a chamber for receipt of fluid within said barrel and between said first and second barrel ends; (c) a plastic hollow plunger having a distal end, said plunger being extendable into said barrel through the first end of said barrel, and selectively movable from expanded position toward an expended position; (d) means for permitting the plunger to thereafter move to a collapsed position relative to the second end of the barrel; (e) a hollow needle in secured relationship relative to the second end of the barrel; (f) biasing means in initially secured relationship relative to the second end of the barrel for biasing the needle toward the hollow plunger; (g) means for directing forward pressure upon said plunger; (h) sealing means including an elastomeric sealing member for slidable sealing engagement with the inside diameter wall of the barrel, said sealing means further including a tubular housing for receipt and carriage of said sealing means therearound, said tubular housing being initially engaged with, but selectively permanently disengagable from, the distal end of the plunger after the plunger is moved to the expended position; (i) means for engaging the plunger distal end to the tubular housing of the sealing means and for permitting selective telescopic movements of the plunger distal end into the tubular housing; and (j) a cutting tip carried by the plunger for cutting through the sealing members such that the biasing means thereafter releases the needle into the plunger when the plunger is at the collapsed position relative to the second end of the barrel.