Patent ID: 7727197

Claim:
A method of making a surgical device for injecting a chemical agent within a subject for use in endoscopic injection therapies, the method comprising the steps of: a. fabricating a spring from a helically wound wire coated about its circumference with a low friction material to form an internal passageway; b. determining a desired length of a guide housing; c. cutting said spring to an initial length to form a guide housing, wherein said initial length is greater than said desired length; d. assembling the device comprising the steps of: i. providing a support body; ii. inserting at least a portion of a motion transmitting unit within said body, said unit comprising a first end portion proximal to said support body and a second end portion remote from said support body, wherein said motion transmitting unit is movable relative to said support body; iii. providing an agent delivery system comprising a needle having a hollow elongated body, a first end for extending into a subject and a second end fixed to said motion transmitting member, and structure defining a conduit between said support body and said needle; iv. fixing said needle to said motion transmitting unit; and v. sliding at least a portion of said motion transmitting unit adjacent said needle within said guide housing; and e. conditioning said guide housing prior to use of the device in an endoscopic surgical procedure by manipulating the guide housing to flatten the low friction material between the wire, so the initial length shortens to essentially the desired length.