# US 5,704,918 A · Syringe > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,704,918 A - Document ID: US5704918A - Status: Granted - Kind: A - Application number: 08/766,913 - Filed: 1996-12-13 - Granted: 1998-01-06 - Earliest claimed: 1992-12-01 - Inventors: Tetsuro Higashikawa - Web page: https://patentgrep.com/patent/US5704918A ## CPC - A61M 5/19: having more than one chamber - A61M 5/284: {comprising means for injection of two or more media, e.g. by mixing} - A61M 5/3129: {Syringe barrels (A61M5/3205, A61M5/50 take precedence)} - A61M 5/31596: {comprising means for injection of two or more media, e.g. by mixing} - A61M 5/286: {upon internal pressure increase, e.g. pierced or burst (A61M5/283 takes precedence)} - A61M 5/31598: {having multiple telescopically sliding coaxial pistons encompassing volumes for components to be mixed} - A61M 5/348: {snap lock, i.e. upon axial displacement of needle assembly (A61M5/344 takes precedence)} - A61M 2005/1787: {Syringes for sequential delivery of fluids, e.g. first medicament and then flushing liquid} - A61M 2005/287: {by displacing occluding plugs} - A61M 2005/3104: {Caps for syringes without needle} - A61M 2005/3123: {having air entrapping or venting means, e.g. purging channels in pistons} - A61M 2005/3132: {having flow passages for injection agents at the distal end of the barrel to bypass a sealing stopper after its displacement to this end due to internal pressure increase} - A61M 2005/3139: {Finger grips not integrally formed with the syringe barrel, e.g. using adapter with finger grips} - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} ## Abstract In medical scenes requiring emergency, where plural medicines are to be injected simultaneously, or solution of solid medicine is to be injected, different kinds of injection agents, without being previously mixed, are accommodated in chambers formed separately in a cylinder. In using a syringe, both injection agents can be sequentially injected separately or mixedly by a simple operation. ## Claims ### Claim 1 A syringe, comprising: a cylinder having a connection portion for a syringe needle at one end and an opening at the other end; two partitions formed apart from each other within said cylinder, with a hole formed in one of said partitions remote from said connection portion; a first small cylinder having a tip which abuts on said one partition and which rotatably abuts on an inside of said cylinder; a valve member, residing at the tip of said first small cylinder, for communicating the chamber between said partitions with a chamber formed in said first small cylinder in accord with the hole formed in said partition or separating both chambers from each other in displacement from said hole by rotation of said small cylinder; a plunger slidably provided in said first small cylinder; and a passage communicating the chamber between said partitions with said connection portion provided when said plunger is moved toward said syringe needle. ### Claim 2 (depends on 1) A syringe according to claim 1, further comprising: a second small cylinder having the same structure as said first small cylinder. ### Claim 3 (depends on 1) A syringe according to claim 1, wherein: said passage includes an enlarged portion formed adjacent said syringe needle connection portion, a cylindrical receiver, accommodated in said enlarged portion, for slidably receiving said partition inside itself, and a passing-through passage formed in said receiver. ### Claim 4 A syringe, comprising: a cylinder having a connection portion for a syringe needle at one end and an opening at the other end; and a plunger to be inserted into the cylinder from the opening, wherein, between said connection portion and said plunger within said cylinder, at least one partition is slidably provided to watertightly divide an internal space into plural chambers of said cylinder, an injection agent is accommodated within at least one chamber defined between said partitions or between said partition and said plunger, a passage communicating each of said chambers with said connecting portion is provided when said plunger is moved to the side of said syringe needle, a pillar member having a hollow portion communicating with said connection portion and protruding into said cylinder to close its tip is further provided, said passage consists of said hollow portion of said pillar member and a through-hole formed on the side of said pillar member, one of said partitions is slidably fit between an outer periphery of said pillar member and an inner periphery of said cylinder so as to close said through-hole, and said passage is opened when said partition slides toward the side of said syringe needle. ### Claim 5 A syringe, comprising: a cylinder, having a connection portion for a syringe needle at a first end and an opening at a second end; and a plunger to be inserted into the cylinder from the opening, wherein a plurality of partitions are slidably provided between said connection portion and said plunger within said cylinder to divide an internal space of said cylinder into plural watertight chambers, wherein between adjacent partitions or between one of said partition and said plunger, two or more chambers are formed, wherein the chambers are filled with respective injection agents, and a passage formed integrally with the cylinder and communicating each of said chambers with said connection portion is provided without distorting said partitions when said plunger is moved within said cylinder toward said first end, wherein at the center portion of a different partition from said partition, a passage member having a double pipe structure is provided in which an internal cylinder is coaxially held in an external cylinder with a gap therebetween, said passage further includes a hollow portion formed in said internal cylinder so that the side of the syringe needle is opened and the side of the plunger is closed and through-hole is formed on the side of said internal cylinder, a small partition for sealing said gap between said internal and external cylinders and closing said through-hole is slidably fit, and said passage is opened when said partition slides toward said small partition. ### Claim 6 A syringe, comprising: a cylinder having a connection portion for a syringe needle at one end and an opening at the other end; and a plunger to be inserted into the cylinder from the opening, wherein between said connection portion and said plunger within said cylinder, at least one partition is slidably provided to watertightly divide the internal space into plural chambers of said cylinder, within at least one chamber between said partitions or between said partition and said plunger, an injection agent is accommodated, a passage communicating each of said chambers with said connecting portion is provided when said plunger is moved to the side of said syringe needle, a passage rod member is provided within said cylinder so a to extend along said cylinder in a longitudinal direction of said cylinder and pass through said partition and said plunger watertightly, wherein one of said passages includes a terminal hollow portion formed in the longitudinal direction of said passage rod member and whose one end communicates with said connection portion, and a first through-hole formed in the neighborhood of the other end of said terminal hollow portion and communicating said hollow portion with the inside of said cylinder, the other passage includes at least one intermediate hollow portion separated from said terminal hollow portion and each other and formed in the longitudinal direction of said passage rod member, and a second through-hole formed in the neighborhood of each of both ends of said intermediate hollow portion and communicating said hollow portion with the inside of said cylinder, and as said plunger moves, said partition is shifted from the position where said passage is closed to the position where it is opened. ### Claim 7 A syringe, comprising: a cylinder having a connection portion for a syringe needle at one end and an opening at the other end; and a plunger to be inserted into the cylinder from the opening, wherein between said connection portion and said plunger within said cylinder, at least one partition is slidably provided to divide watertightly the internal space into plural chambers of said cylinder, within at least one chamber between said partitions or between said partition and said plunger, an injection agent is accommodated, a passage communicating each of said chambers with said connecting portion is provided when said plunger is moved to the side of said syringe needle, and said passage consists of at least one pair of through-holes separated from each other by a distance longer than the length of said partition in said cylinder and a pipe connecting the through-holes of each pair with each other. ### Claim 8 (depends on 7) A syringe according to claims 7, wherein: a passage communicating said pipe with said connection portion is formed at said partition nearest to said syringe needle. ### Claim 9 A syringe, comprising: a main cylinder having a connection portion for a syringe needle at one end and an opening at the other end; a first plunger to be inserted into the cylinder from the opening; between said connection portion and said plunger within said cylinder, at least two partitions slidably provided to divide an internal space of the main cylinder into at least two watertight chambers adapted to be filled with different injection agents of said cylinder; at least one passage communicating each of said chambers with said connection portion; a hole formed in one of said partitions remote from said connection portion; a first inner cylinder having a tip which abuts on said one partition and which rotatably abuts on the inside of said cylinder; and a valve member disposed at the tip of said inner cylinder. ### Claim 10 (depends on 9) A syringe according to claim 9, wherein: a second inner cylinder having the same structure as said first inner cylinder is provided in said main cylinder. ### Claim 11 (depends on 9) A syringe according to claim 9, wherein: an enlarged portion is formed near said syringe needle connection portion and a cylindrical receiver is accommodated in said enlarged portion for slidably receiving said partition inside itself and said passage is formed in the cylindrical receiver. ### Claim 12 A syringe, comprising: a main cylinder having a connection portion for a syringe needle at one end and an opening at the other end; a first plunger to be inserted into the cylinder from the opening; between said connection portion and said plunger within said cylinder, at least two partitions slidably provided to divide an internal space of the main cylinder into at least two watertight chambers adapted to be filled with different injection agents of said cylinder; at least one passage communicating each of said chambers with said connection portion; and a pillar member having a hollow portion communicating with said connection portion and protruding into said main cylinder to close its tip, wherein said passage comprises said hollow portion of said pillar member and a first through-hole formed on the side of said pillar member, and one of said partitions being slidably fit between the outer periphery of said pillar member and the inner periphery of said cylinder so as to close said first through-hole. ### Claim 13 A syringe, comprising: a main cylinder having a connection portion for a syringe needle at one end and an opening at the other end; a first plunger to be inserted into the cylinder from the opening; between said connection portion and said plunger within said cylinder, at least two partitions slidably provided to divide an internal space of the main cylinder into at least two watertight chambers adapted to be filled with different injection agents of said cylinder; and at least one passage communicating each of said chambers with said connection portion, wherein at the center portion of a second partition, a passage having a double pipe structure is provided in which a third internal cylinder is coaxially held in said cylinder with a gap from each other, said second passage further including a hollow portion formed in said third internal cylinder so that the side of the syringe needle is opened and the side of the plunger is closed and a second through-hole formed on the side of said third internal cylinder, and an inner partition for sealing said gap between said two cylinders for closing said second through-hole is slidably fit therein. ### Claim 14 A syringe, comprising: a main cylinder having a connection portion for a syringe needle at one end and an opening at the other end; a first plunger to be inserted into the cylinder from the opening; between said connection portion and said plunger within said cylinder, at least two partitions slidably provided to divide an internal space of the main cylinder into at least two watertight chambers adapted to be filled with different injection agents of said cylinder; at least one passage communicating each of said chambers with said connection portion; and a passage rod member is provided within said main cylinder so as to extend along said main cylinder in a longitudinal direction of said main cylinder and passes through said partition and said plunger watertightly, wherein the first passage comprises a terminal hollow portion formed in the longitudinal direction of said passage rod member and whose one end communicates with said connection portion, and a third through-hole formed near the other end of said terminal hollow portion and communicating said hollow portion with the inside of said cylinder, and the second passage comprises at least one intermediate hollow portion separated from said terminal hollow portion and each other, and formed in the longitudinal direction of said passage rod member, and a fourth through-hole formed near each of both ends of said intermediate hollow portion and communicating said hollow portion with the inside of said main cylinder. ### Claim 15 A syringe, comprising: a main cylinder having a connection portion for a syringe needle at one end and an opening at the other end; a first plunger to be inserted into the cylinder from the opening; between said connection portion and said plunger within said cylinder, at least two partitions slidably provided to divide an internal space of the main cylinder into at least two watertight chambers adapted to be filled with different injection agents of said cylinder; and at least one passage communicating each of said chambers with said connection portion; wherein said at least one passage comprises at least one pair of through-holes separated from each other by a distance longer than the length of one of said at least two partitions in said main cylinder and a pipe connecting the through-holes of said at least one pair with each other. ### Claim 16 (depends on 15) A syringe according to claim 15, wherein: said at least one passage communicating said pipe with said connection portion is formed at that one of said at least two partitions which is located nearest to said syringe needle. ### Claim 17 (depends on 9) A syringe according to claim 9, wherein: within said main cylinder, a hollow fixed type inner cylinder is provided coaxially with said main cylinder at a portion of the hollow portion of said fixed type inner cylinder, a closing portion is formed, and on both sides of said closing portion fifth and sixth through-holes are formed to communicate the hollow portion of said fixed type inner cylinder with that of said cylinder, a partition of said second plunger is fit within said fixed type inner cylinder to form one of said chambers therebetween, and another partition, and the first plunger is fit between said main cylinder and said fixed type inner cylinder to form the other chamber therebetween, the one passage includes a terminal passing-through portion formed within said fixed type inner cylinder and said fifth through-hole, the other passage comprises a sixth through-hole. ### Claim 18 (depends on 1) A syringe according to claim 1, characterized in that another small cylinder having the same structure as said small cylinder is provided in said cylinder.