Reciprocation vitreous suction cutter head

• US 4,108,182 A
• Filed: 02/16/1977
• Issued: 08/22/1978
• Est. Priority Date: 02/16/1977
• Status: Expired due to Term

• Current Assignee: Xomed Surgical Products, Inc. (Medtronic Plc)
• Original Assignee: Concept, Inc. (Bristol-Myers Squibb Company)
• Inventors: Trott, Arthur F., Hartman, Robert M.
• Primary Examiner(s): Yasko, John D.
• Application Number:
  US05/769,191
• Time in Patent Office: 552 Days
• Field of Search: 128/305, 128/303, 128/310, 128/276, 30/133, 30/217, 30/220, 30/272 A
• US Class Current: 606/171
• CPC Class Codes: A61B 2017/320028 with reciprocating movements
• CPC Class Codes: A61F 9/00763 with rotating or reciprocating cutting elements, e.g. concentric cutting needles atherectomy cutting instruments A61B17/3207; endoscopic cutting instruments A61B17/320016

Abstract

A surgical instrument comprising a housing with a motor and source of power contained in the housing. A removable sheath is placed over the housing and a cutter assembly is removably mounted to the housing so that the housing is protected from external materials and contamination. The cutter assembly has a body, a tube projecting from the body, a reciprocating blade positioned in the tube and a cam drive transfer mechanism mounted in the cutter body which transmits motion to the blade from the motor shaft. The tube defines an aperture in its side and the blade as it reciprocates in combination with the walls defining the aperture shears vitreous material entering the hole. A second passage is formed in the cutter body communicating with the tube to allow pressure differentials to be exerted to the tube.

The cutter head and removable protective sheath are replaced after each successive operation in order to eliminate patient-to-patient cross contamination.

Claims

1. A surgical cutting device comprising a housing, motor means mounted inside said housing, means to energize said motor means, a shaft mounted to said motor means inside said housing, a cutter head removably secured to said housing, said cutter head comprising a body, an elongated tube secured to said cutter head body, a blade positioned in said tube and adapted to be reciprocated within said tube, said tube provided with an aperture therein to allow said blade to come in contact with tissue, drive transfer means mounted in said cutter head, said drive transfer means comprising a cam connected to said shaft, a cam follower assembly mounted in said cutter head engaging said cam, said blade means mounted to said cam follower thereby transmitting motion from said motor means to said blade means, said cutter head defining a passage-way communicating with said tube and adapted to supply a vacuum from an external source to said tube so that tissue sheared off by the reciprocation of said blade inside said tube will be carried off into said passage-way.

2. A surgical instrument comprising a housing, motor means mounted in said housing and contained in said housing, said motor means being connected to a source of power, a removable sheath means mounted over said housing and surrounding said housing to protect said housing from external materials and contamination, and also to prevent cross contamination between successive operations, a cutter means removably mounted to said housing, said cutter means comprising a body, a tube projecting from said body, a blade means slidably mounted in said tube and mechanical drive transfer means mounted in said cutter means body, said mechanical drive transfer means connecting said blade means to said motor means for reciprocating movement of said blade means when said motor is activated, said tube defining an aperture in its side, said blade means in combination with the internal walls defining said tube aperture being adapted to shear tissue entering said hole, and a second passage means formed in said body and communicating with said tube to allow pressure differentials to be exerted to said tube.

3. A cutter means as claimed in claim 2 wherein said cutter means is disposable.

4. A surgical instrument as claimed in claim 2 wherein said source of power is battery means located within said housing.

5. A cutter means as claimed in claim 2 wherein said drive transfer means comprises a cam means removably connected to a drive shaft and adapted to be rotated by said drive shaft, a cam follower assembly mounted in said cutter means adapted to engage said cam and be reciprocated by said cam, spring means mounted around said cam follower assembly adapted to urge said blade means toward said drive housing.

6. The drive transfer means of claim 5 further comprising seal means surrounding said cam follower body adjacent a cam follower retaining ring which seal means serves to maintain a fluid tight seal between said cam follower and said blade.

7. The surgical instrument as claimed in claim 2 further including a source of vacuum connected to said body second passage means, said source of vacuum comprising a syringe connected to said second passage means by a hose means, said syringe being adapted to be activated by pulling the plunger out of the syringe to form a partial vacuum in the syringe and in the second passage means leading out to the aperture formed in said tube.

8. A surgical cutting apparatus comprising a drive housing, sheath means surrounding said drive housing and mounted to said drive housing, a removable cutting means mounted to said drive housing in engagement with said sheath means to form a fluid tight seal between said drive housing, sheath means and removable cutting means, motor means mounted in said drive housing, said motor means including a micromotor with a drive shaft, a source of power mounted in said drive housing, said motor means and source of power being enclosed in said drive housing, said removable cutting means comprising a cam means adapted to be connected to said motor shaft and blade means connected to a cam follower driven by said cam when said motor means is energized.

9. A surgical cutting apparatus as claimed in claim 8 wherein said cutting means comprises a body defining an axial bore, a cam follower assembly slidably mounted in said bore, said cam follower assembly comprising a coupling member, a tubular blade secured to one end of said coupling member, the other end of said coupling member being formed to engage a cam driven by said drive shaft, seal means surrounding said cam follower assembly dividing said axial bore into at least two separate compartments, said tubular blade defining an aperture therein.

10. A surgical cutting instrument as claimed in claim 8 wherein said sheath means comprises a flexible sack having a closed end and an open end with an annular lip.

11. A surgical cutting device for incising vitreous and other materials from the eye comprising an elongated tubular housing having an open end and a closed end, said tubular housing defining an opening in the side wall thereof adjacent the closed end, a tubular cutting member mounted coaxially within said tubular housing in sliding contact with the inner surface of said tubular housing, said tubular cutting member having a cutting edge facing said closed end of said tubular housing, mechanical actuation cam means for producing relative actual movement between said tubular housing and said tubular cutting member so that said tubular cutting member extends past said aperture of said tubular housing and incises substances drawn into said aperture in said tubular housing by acting in concert with the wall of said tubular housing defining said aperture, means coupling said tubular cutting member to a suction source to draw the incised substances from said housing up through said tubular cutting member and activation means to activate said mechanically actuated means said activation means being removably mounted to said elongated tubular housing.

12. A surgical cutting device for incising vitreous and other materials from the eye comprising an elongated tubular housing having an opened end and a closed end, said tubular housing defining an opening in the side wall thereof adjacent the closed end, a tubular cutting member mounted coaxially within said tubular housing in sliding contact with the inner surface of said tubular housing, said tubular member having an opening in the side wall, providing a passage for vitreous material and the like into the tubular housing allowing removal of materials from the interior of said housing, said tubular member having a cutting edge facing said closed end of said tubular housing, mechanically actuated cam means for producing relative actual movement between said tubular housing and said tubular member so that said tubular member incises material drawn into said aperture in said tubular housing by acting in concert with the wall of said tubular housing, said opening providing communication of said tubular member to a suction pressure source to draw the incised material up through said tubular member and from said housing and means to activate said mechanically actuated cam means removably mounted to said elongated tubular housing, said activation means comprising an enclosed power source and motor mounted in said tubular housing, said cam means comprising a cam connected to said motor and a cam follower means engaging said cam, said cam follower means comprising a body with said tubular members being mounted to said body.