Catheter placement device

Claim 2

A catheter placement device having, in combination: an elongated resiliently flexible plastic catheter having an imperforate tip at one end shaped for blunt dissection of tissue, a central passage extending through said catheter from the opposite end thereof to said tip, said passage terminating adjacent said tip in a transverse end wall, and at least one laterally opening port adjacent said tip communicating with said passage; an elongated cannula disposed in said catheter in sliding, telescoped relation therewith and haviNg a transverse end surface engaging said end wall, the other end portion of said cannula projecting through said opposite end of the catheter; means on said other cannula end forming a grip for said placement device whereby said imperforate tip is pressed through tissue by a force applied through the cannula against said transverse end wall; and said cannula having a longitudinal passage opening through the transverse end surface thereof toward said end wall, and said port in said catheter being connected to said cannula passage by means including a connecting passage opening through the central portion of said end wall.

Claim 3

A catheter placement device having, in combination: an elongated catheter having an imperforate rounded tip at one end, a longitudinal passage of preselected diameter extending through said catheter from the end thereof opposite said tip and terminating in a transverse end wall adjacent said tip, and a connecting passage extending from said end wall into said tip and opening laterally therefrom to form at least one port communicating through said connecting passage with said longitudinal passage; an elongated cannula having an outside diameter approximately equal to said inside diameter, a longitudinal internal passage, and opposite ends through which the internal passage opens, said cannula being disposed within said catheter with a sliding fit with one of its ends abutting against said wall and with said internal passage communicating with said port through said connecting passage; and means on the other end of said cannula forming a grip for said placement device whereby said tip is pressed through tissue by a force applied through said cannula and said end wall while said port remains in communication with said cannula passage.

Claim 4

A catheter placement device having, in combination: an elongated catheter having an imperforate rounded tip at one end, a longitudinal passage of preselected diameter extending through said catheter from the end thereof opposite said tip and terminating in a transverse end wall adjacent said tip, and a connecting passage extending from said end wall into said tip and opening laterally therefrom to form at least one port communicating through said connecting passage with said longitudinal passage; an elongated cannula having an outside diameter approximately equal to said inside diameter, a longitudinal internal passage, and opposite ends through which the internal passage opens, said cannula being disposed within said catheter with a sliding fit with one of its ends abutting against said wall and with said internal passage communicating with said port through said connecting passage; and means on the other end of said cannula forming a grip for said placement device whereby said tip is pressed through tissue by a force applied through said cannula and said end wall while said port remains in communication with said cannula passage.

Claim 5

A catheter placement device having, in combination: an elongated resiliently flexible plastic catheter having an imperforate tip at one end shaped for blunt dissection of tissue, a central passage extending through said catheter from the opposite end thereof to said tip, said passage terminating adjacent said tip in a transverse end wall; an elongated cannula disposed in said catheter in sliding, telescoped relation therewith and having a traverse end surface engaging said end wall, the other end portion of said cannula projecting through said opposite end of the catheter; means on said other cannula end forming a grip for said placement device whereby said imperforate tip is pressed through tissue by a force applied through the cannula against said transverse end wall; and two laterally opening ports formed on opposite sides of said catheter adjacent said tip at the opposite ends of a cross-passage through the catheter between said end wall and said tip, said cross-passage being connected to said catheter passage by a connecting port centrally located in said end wall to communicate with the interior of said cannula through said end surface thereof.

Claim 6

A catheter placement device having, in combination: an elongated resiliently flexible plastic catheter having an imperforate tip at one end shaped for blunt dissection of tissue, a central passage extending through said catheter from the opposite end thereof to said tip, said passage terminating adjacent said tip in a transverse end wall; an elongated cannula disposed in said catheter in sliding, telescoped relation therewith and having a traverse end surface engaging said end wall, the other end portion of said cannula projecting through said opposite end of the catheter; means on said other cannula end forming a grip for said placement device whereby said imperforate tip is pressed through tissue by a force applied through the cannula against said transverse end wall; and two laterally opening ports formed on opposite sides of said catheter adjacent said tip at the opposite ends of a cross-passage through the catheter between said end wall and said tip, said cross-passage being connected to said catheter passage by a connecting port centrally located in said end wall to communicate with the interior of said cannula through said end surface thereof.

Claim 7

A catheter placement device as defined in claim 3 in which said tip is generally hemispherical in shape and said cross-passage is offset from the center of curvature toward said tip, said tip being thickened longitudinally of said cross-passage to a nearly rectangular shape to dispose said laterally opening ports in planes extending substantially longitudinally of said catheter.