The pump unit (10) has a particularly simple design, which includes just two housing parts (14, 15) and also four valve closure members (37) and pump pistons (25, 29). The valve closure members (37) are preferably identical to one another and are trapped in a pocket between both housing parts (14, 1
The pump unit (10) has a particularly simple design, which includes just two housing parts (14, 15) and also four valve closure members (37) and pump pistons (25, 29). The valve closure members (37) are preferably identical to one another and are trapped in a pocket between both housing parts (14, 15). The housing parts (14, 15) are preferably permanently interconnected by an ultrasonic weld seam. The valve closure members are formed by disc-like or plate-like plastic parts, which are resilient per se and which may optionally have a central pin (42) as an assembly and orientation aid. As desired, the valve closure members bear against their respective valve seat (43) with or without bias and form valves which open and close particularly reliably, are responsive to the slowest flow velocities and can be easily sterilized.
대표청구항▼
1. A pump unit (10) for water jet surgery, comprising: a pump housing (13), which has a first housing part (14) and a second housing part (15), whereina suction channel (16) and a pressure channel (17) are formed in the first housing part (14), wherein the pressure channel (17) is configured to conn
1. A pump unit (10) for water jet surgery, comprising: a pump housing (13), which has a first housing part (14) and a second housing part (15), whereina suction channel (16) and a pressure channel (17) are formed in the first housing part (14), wherein the pressure channel (17) is configured to connect to a water jet surgery instrument,at least two pump cylinders (22, 26), which are formed on the second housing part (15) and which are configured to receive pump pistons (25, 29) and from each of which two pump channels (23, 24; 27,28) depart,valve chamber recesses (31), which are formed in one of the housing parts (14, 15),valve chamber closures (32), which are associated with the valve chamber recesses (31) in order to shut off said valve chamber recesses so as to form respective valve chambers (30), into which the pressure channel (17) or the suction channel (16) leads,at least one valve closure member (37), which is permeable to sterilization gas,wherein the suction channel (16), the pressure channel (17) and the pump channels (23, 24, 27, 28) are in communication with select ones of the respective valve chambers (30);wherein the valve chamber closure (32) is formed together with an edge (39) of the valve closure member (37) and one or more recesses (47) defined in the valve closure member (37) in a manner defining an overflow structure (44) that defines a path for the sterilization gas to contact at least portions of opposing sides of the valve closure member (37) while the valve closure member (37) is in a closed position preventing liquid flow between the respective valve chamber (30) and a corresponding one of the pressure channel (17) or the suction channel (16);wherein the at least one valve closure member (37) includes a centrally located hub portion (40) and a spring zone (41) located between the centrally located hub portion (40) and the edge (39), wherein the spring zone (41) is of a reduced thickness relative to the centrally located hub portion (40) and the edge (39) for allowing resilient deformation of the valve closure member at the spring zone (41). 2. The pump unit according to claim 1, wherein the valve closure member (37) comprises a plate portion (38) and a central pin (42) and is arranged in one of the respective valve chambers (30) such that the central pin (42) extends into one of the suction channel (16), the pressure channel (17) and the pump channels (23, 24, 27, 28), wherein the plate portion (38) is configured to deform to open and close a fluid passage through one of the respective valve chambers (30). 3. The pump unit according to claim 1, wherein the valve chamber closures (32) are formed as extensions (42) protruding into the valve chamber recesses (31). 4. The pump unit according to claim 1, wherein the valve chamber closures (32) with the valve chamber recesses (31) define an annular gap (35). 5. The pump unit according to claim 1, wherein the housing parts (14, 15) are interconnected by an integrally bonded connection (36). 6. The pump unit according to claim 5, wherein the connection (36) is a friction weld seam. 7. The pump unit according to claim 5, wherein the connection (36) is arranged in a plane beyond which extensions (33) protrude. 8. The pump unit according to claim 1, wherein each valve chamber closure (32) defines one of the pump channels (23, 24, 27, 28). 9. The pump unit according to claim 1, wherein at least two of said valve chamber closures (32) are associated with each pump cylinder (22, 26), one of said valve chamber closures having one of the pump channels (23, 27) serving as an inlet channel and another of said valve chamber closures having another one of the pump channels (24, 29) serving as an outlet channel. 10. The pump unit according to claim 9, wherein a central pin (42) of the valve closure member (37) is arranged to protrude into the suction channel (16) or into the pump channel (23, 27) serving as the inlet channel. 11. The pump unit according to claim 9, wherein a valve seat (43) is formed at the pump channel (24, 28) that leads to the pressure channel (17). 12. The pump unit according to claim 11, wherein the valve closure member (37) is arranged to bear against the valve seat (43) without play. 13. The pump unit according to claim 1, wherein the suction channel (16) opens out at a valve seat (43), against which the valve closure member (37) bears without play. 14. The pump unit according to claim 1, wherein identical valve closure members of the at least one valve closure member (37) are arranged in the respective valve chambers (30). 15. The pump unit according to claim 1, wherein the valve closure member (37) has a convexly curved surface on one of the opposing sides thereof for engaging with a valve seat (43), and the spring zone (41) is formed at least in part by an annular groove formed on the other of the opposing sides of the valve closure member (37), the annular groove extending about the centrally located hub portion (40). 16. The pump unit according to claim 15, wherein the valve seat (43) has a diameter and the annular groove has a diameter that is at least as large as the diameter of the valve seat. 17. A pump unit (10) for water jet surgery, comprising: a pump housing (13), which has a first housing part (14) and a second housing part (15), whereina suction channel (16) and a pressure channel (17) are formed in the first housing part (14), wherein the pressure channel (17) is configured to connect to a water jet surgery instrument,at least two pump cylinders (22, 26), which are formed on the second housing part (15) and which are configured to receive pump pistons (25, 29) and from each of which two pump channels (23, 24; 27,28) depart,valve chamber recesses (31), which are formed in one of the housing parts (14, 15),valve chamber closures (32), which are associated with the valve chamber recesses (31) in order to shut off said valve chamber recesses so as to form respective valve chambers (30), into which the pressure channel (17) or the suction channel (16) leads,at least one valve closure member (37) having a flexible disc or plate like shape and is configured to deform to open and close a fluid passage through one of the respective valve chambers (30),wherein the suction channel (16), the pressure channel (17) and the pump channels (23, 24, 27, 28) are in communication with select ones of the respective valve chambers (30);wherein at least one of the valve chamber closures (32) is formed together with an edge (39) of an associated valve closure member of the valve closure members (37) and one or more recesses (47) defined by the associated valve closure member in a manner defining an overflow structure (44) that defines a path for a sterilization gas to contact at least portions of opposing sides of the associated valve closure member (37) while the associated valve closure member (37) is in a closed position preventing liquid flow between the respective valve chamber (30) and a corresponding one of the pressure channel (17) or the suction channel (16);wherein the at least one valve closure member (37) includes a centrally located hub portion (40) and a spring zone (41) located between the centrally located hub portion (40) and the edge (39), wherein the spring zone (41) is of a reduced thickness relative to the centrally located hub portion (40) and the edge (39) for allowing resilient deformation of the valve closure member at the spring zone (41). 18. The pump unit according to claim 17, wherein the flexible disc or plate like shape of the at least one valve closure member (37) comprises a plate portion (38) and a central pin (42) and is arranged in one of the respective valve chambers (30) such that the central pin (42) extends into one of the suction channel (16), the pressure channel (17) and the pump channels (23, 24, 27, 28). 19. The pump unit according to claim 18, wherein the central pin (42) of the valve closure member (37) is arranged to protrude into the suction channel (16) or into the pump channel (23, 27) serving as the inlet channel. 20. The pump unit according to claim 17, wherein at least two of said valve chamber closures (32) are associated with each pump cylinder (22, 26), one of said valve chamber closures having one of the pump channels (23, 27) serving as an inlet channel and another of said valve chamber closures having another one of the pump channels (24, 29) serving as an outlet channel.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (6)
Holtermann Ludwig K. (Old Saybrook CT) Lee ; II Leighton (Guilford CT), Check valve.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.