Combined needle and dilator apparatus
First Claim
1. A combined needle and dilator apparatus, comprising:
- a. A needle with an elongated shaft terminating forwardly in a head having an outer diameter greater than the outer diameter of the shaft adjacent the head and defining a generally rearwardly facing shoulder, the head terminating forwardly in a cutting edge; and
b. A dilating sheath slidably carried about the needle shaft and having a generally cylindrical front portion terminating in a forward rim abutting the shoulder of the needle head, said front portion having a uniform outer diameter substantially equal to the outer diameter of the needle head to define, with the head, a generally smooth surface;
the sheath further having a generally cylindrical body portion with an outer diameter greater than the outer diameter of said front portion, and a tapered portion having rearwardly divergent walls and disposed between said front portion and said body portion of the sheath, the tapered portion having an outer surface smoothly merging into the outer surfaces of the front portion and the body portion.
3 Assignments
0 Petitions
Accused Products
Abstract
The present invention provides a combined needle and dilator comprising a needle having a head with an outer diameter greater than the outer diameter of the body of the needle and a dilating sheath carried about the needle and abutting the rearward needle portion of the needle head. The dilating sheath has a front portion with an outer diameter substantially equal to the outer diameter of the needle head to define, with the head, a generally smooth surface; a body portion with an outer diameter greater than that of the front portion; and a tapered portion disposed between the front and body portions. The tapered portion has an outer surface smoothly merging into the outer surfaces of the front portion and the body portion.
139 Citations
9 Claims
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1. A combined needle and dilator apparatus, comprising:
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a. A needle with an elongated shaft terminating forwardly in a head having an outer diameter greater than the outer diameter of the shaft adjacent the head and defining a generally rearwardly facing shoulder, the head terminating forwardly in a cutting edge; and b. A dilating sheath slidably carried about the needle shaft and having a generally cylindrical front portion terminating in a forward rim abutting the shoulder of the needle head, said front portion having a uniform outer diameter substantially equal to the outer diameter of the needle head to define, with the head, a generally smooth surface;
the sheath further having a generally cylindrical body portion with an outer diameter greater than the outer diameter of said front portion, and a tapered portion having rearwardly divergent walls and disposed between said front portion and said body portion of the sheath, the tapered portion having an outer surface smoothly merging into the outer surfaces of the front portion and the body portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification