Syringe and catheter apparatus
First Claim
1. Improved syringe and catheter apparatus comprising:
- catheter means for internally blocking a body passage, said catheter means being adapted to internally receive a predetermined maximum volume of pressurized gas from a source thereof and having an inflatable portion insertable into the body passage for inflation therein by the pressurized gas received within said catheter means;
syringe means operable to discharge up to said predetermined maximum volume of pressurized gas through an outlet of said syringe means into the interior of said catheter means;
pressure reducing means carried by said syringe means defining an essentially inextensible enlargement of the gas-receiving interior of said catheter means, said enlargement functioning as a pressure absorption zone which reduces to a predetermined magnitude the maximum internal pressure within the gas receiving interior of said catheter means caused by receipt therein of said predetermined maximum volume of pressurized gas from said syringe means so that said predetermined maximum volume of pressurized gas may be forced into and retained within the gas-receiving interior of said catheter means without creating therein a pressure exceeding said predetermined magnitude thereof; and
orifice means operatively associated with said outlet of said syringe means for limiting the initial pressurization rate of said inflatable portion of said catheter means during an initial portion of the operation of said syringe means.
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Accused Products
Abstract
To inflate the balloon element on the distal end of a pulmonary artery catheter an improved gas syringe is provided which is both volume and pressure-limited so that the syringe is capable of discharging into the catheter no more than the maximum design gas inlet volume thereof while at the same reducing the maximum attainable pressure within the catheter to a predeterminable level substantially below that reached when a conventional volume-limited syringe of the same gas discharge capacity is used. The syringe volume delivery limitation is achieved by forming rearwardly disposed plunger stop members, or a suitable vent opening, in a sidewall portion of the syringe body. The pressure limitation is obtained by forming a pressure absorption zone which defines a substantially inextensible enlargement of the gas-receiving interior of the catheter. In an alternate embodiment of the syringe, an orifice plate having a small orifice opening therein is secured across the syringe outlet to limit the balloon inflation rate during an initial portion of the operation of the syringe.
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Citations
32 Claims
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1. Improved syringe and catheter apparatus comprising:
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catheter means for internally blocking a body passage, said catheter means being adapted to internally receive a predetermined maximum volume of pressurized gas from a source thereof and having an inflatable portion insertable into the body passage for inflation therein by the pressurized gas received within said catheter means; syringe means operable to discharge up to said predetermined maximum volume of pressurized gas through an outlet of said syringe means into the interior of said catheter means; pressure reducing means carried by said syringe means defining an essentially inextensible enlargement of the gas-receiving interior of said catheter means, said enlargement functioning as a pressure absorption zone which reduces to a predetermined magnitude the maximum internal pressure within the gas receiving interior of said catheter means caused by receipt therein of said predetermined maximum volume of pressurized gas from said syringe means so that said predetermined maximum volume of pressurized gas may be forced into and retained within the gas-receiving interior of said catheter means without creating therein a pressure exceeding said predetermined magnitude thereof; and orifice means operatively associated with said outlet of said syringe means for limiting the initial pressurization rate of said inflatable portion of said catheter means during an initial portion of the operation of said syringe means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A syringe for use in internally pressurizing a catheter, comprising:
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a hollow body adapted to receive a quantity of gas and having a hollow outlet end portion operatively connectable to the catheter for discharging gas thereinto from within said body; a plunger received in said body for movement toward and away from said outlet end thereof to respectively discharge gas through said outlet end and draw gas into said body; pressure reducing means for limiting the pressure increase within the catheter to a predetermined magnitude when a predetermined maximum volume of gas is forced into the catheter from said syringe, said pressure reducing means including stop means, interposed between said plunger and said outlet end of said body, for engaging and stopping said plunger in a spaced relationship with said outlet end during movement of said plunger toward said outlet end; and orifice means carried by said hollow body for limiting the initial pressurization rate within the catheter during an initial portion of the operation of said syringe. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification