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Flat-inclined tip needle

  • US 4,721,506 A
  • Filed: 11/07/1986
  • Issued: 01/26/1988
  • Est. Priority Date: 11/07/1986
  • Status: Expired due to Fees
First Claim
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1. An epidural needle for providing liquid communication with a space proximate the dura mater of a spinal cord of a patient comprising:

  • a needle shaft having a first end and a second end with an axial channel extending therebetween;

    said second end of said needle shaft having an attachment means for providing a liquid tight engagement with the syringe;

    said first end of said needle shaft having an inclined surface and a rounded and blunted point;

    a solid rod having a first end and a second end and being slidably receivable into said axial channel of said needle shaft such that said first end of said solid rod is aligned with said first end of said needle shaft;

    said first end of said solid rod having an inclined surface and a rounded and blunted point;

    said point of said needle shaft and said point of said solid rod together defining a unitary tip configuration having a blunt portion and an inclined portion;

    said blunt portion of said unitary tip forming an end face disposed at an angle of about 80°

    to 100°

    relative a longitudinal axis of said needle shaft whereby said unitary tip avoids nicking, piercing, severing, or perforating the veins, arteries, nerves and dura of the patient in traversing the spinal ligaments in and entering a space proximate the dura mater of the spinal cord of the patient to provide liquid communication with the space when the solid rod is withdrawn from the axial channel of the needle shaft.

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