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TWI543785B - 注入泵的原位管測量 - Google Patents

注入泵的原位管測量 Download PDF

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Publication number
TWI543785B
TWI543785B TW098135603A TW98135603A TWI543785B TW I543785 B TWI543785 B TW I543785B TW 098135603 A TW098135603 A TW 098135603A TW 98135603 A TW98135603 A TW 98135603A TW I543785 B TWI543785 B TW I543785B
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sensor
tubular member
tube
shuttle mechanism
pump
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TW098135603A
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TW201032850A (en
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周豫
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百特國際股份有限公司
巴克斯特保健股份有限公司
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142Pressure infusion, e.g. using pumps
    • A61M5/14212Pumping with an aspiration and an expulsion action
    • A61M5/14228Pumping with an aspiration and an expulsion action with linear peristaltic action, i.e. comprising at least three pressurising members or a helical member
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142Pressure infusion, e.g. using pumps
    • A61M5/14212Pumping with an aspiration and an expulsion action
    • A61M5/14232Roller pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00Machines, pumps, or pumping installations having flexible working members
    • F04B43/08Machines, pumps, or pumping installations having flexible working members having tubular flexible members
    • F04B43/082Machines, pumps, or pumping installations having flexible working members having tubular flexible members the tubular flexible member being pressed against a wall by a number of elements, each having an alternating movement in a direction perpendicular to the axes of the tubular member and each having its own driving mechanism
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00Machines, pumps, or pumping installations having flexible working members
    • F04B43/12Machines, pumps, or pumping installations having flexible working members having peristaltic action
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/14Detection of the presence or absence of a tube, a connector or a container in an apparatus
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/33Controlling, regulating or measuring
    • A61M2205/3317Electromagnetic, inductive or dielectric measuring means
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/33Controlling, regulating or measuring
    • A61M2205/3331Pressure; Flow
    • A61M2205/3334Measuring or controlling the flow rate
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/33Controlling, regulating or measuring
    • A61M2205/3375Acoustical, e.g. ultrasonic, measuring means
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/168Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
    • A61M5/16804Flow controllers

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Vascular Medicine (AREA)
  • Anesthesiology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Reciprocating Pumps (AREA)

Description

注入泵的原位管測量
本揭示發明之領域係注入泵,且大致上有關用於經由靜脈路徑抽吸或注入各體積之醫療流體至一病人的系統、設備、及方法。
注入泵被用於經由靜脈點滴將藥物及液體注入病人。而一些注入泵處理相當大之體積,在此可對於具有輸送僅只極小控制下之液體體積的能力之注入泵更感興趣。所使用之藥物可為很重要的、諸如止痛劑、包括鴉片劑之麻醉劑、消炎劑、胰島素、止痙攣的藥物、抗生素、化療藥物、心血管藥物、與類似者等。在一連續之基礎下,很多這些藥物在很低劑量中被需要,以致該病人遍及一長時段具有一穩定、可靠之液流、諸如每小時0.1毫升。如果脈動被使用,該劑量率可被以每脈動或大丸藥之納升或微升的觀點測量。不管一小體積或較大體積之注入泵是否被使用,該注入泵之準確性對於該病人係一成功之結果。
沿著管件之長度,一些注入泵具有一抽吸室,其具有一進入閥及一排出閥。該注入流體被允許經過一打開之進入閥進入該抽吸室中之管件的一段長度,並接著藉由閉塞該管件被隔絕,且藉由在該管件之一入口關閉該進入閥。然後,該排出閥被打開,且一抽吸機件壓縮或以別的方式磨擦所討論的該段長度之管件,以由該抽吸室抽吸該流體或排出該流體朝向該病人。既然該入口被該關閉之閥所阻斷,該液體僅只能以一打開之閥經過該出口離開。該排出閥接著被關上,且該進入閥及抽吸機件被打開,以允許額外之流體由一流體來源進入該抽吸室。該上面係多少被稱為單一抽吸循環或衝程。
該抽吸機件可包括壓縮該管件抵靠著一固定不動之塊件或壓盤的單一抽吸構件。於此案例中,該抽吸構件或壓盤可具有一大體上類似於該入口及排出閥之間的長度。另一選擇係,該抽吸機件可包括複數依照順序壓縮該管件之抽吸指部或構件。在此情況下,特別是如果有充分之抽吸指部,使得至少一指部隨時正壓縮該管件,在此可不需要一入口及/或排出閥。
整個注入之準確性係視每一抽吸循環之準確性而定。換句話說,重要的是以精確性得知每一抽吸循環所抽吸之流體的體積,以得知該整個注入隨著時間之消逝的體積。每一抽吸循環之體積係視該管件之內徑而定。由於從管件至管件之內徑的變異性而發生一問題。在其他所有事物之中,此變異性係由於製造製程及容差。其將為有助於該注入泵能夠決定、或測量待利用於一特定注入之特定IV管件的內徑。基於此資訊,該注入泵能調整該抽吸機件之功能性(該抽吸機件之速率與衝程),以確保及維持準確性,而不管管件內徑變異性。
額外地,該注入泵能使用此資訊,以避免過度地壓縮該管件(由於過度應力而減少管件壽命)及不夠壓縮該管件(導致不精確及無效率)。
使用注入泵,以將藥劑及其他液體精確地注入至病人。被調配之數量可藉由用於調配一特別液體至病人之特別管件的內部尺寸之精確知識所改善。
本揭示內容包括一可輸送規定數量之藥劑、諸如胰島素或嗎啡至病人之注入泵。該注入泵精確地輸送該規定數量之適當藥劑,以便對於該病人確保該最佳之可能結果。該注入泵以管件、且特別以該管件之接觸長度來操作,以經過該接觸長度輸送來自一來源、諸如靜脈注射(“IV”)容器之藥劑,使得該藥劑不會接觸空氣,冒著使該病人暴露至汙染物之風險。該管件典型係藉由經過一模具擠出該塑膠材料所製成。該結果管件之尺寸、諸如該內徑或該外徑能變化多達百分之三或四。本注入泵藉由決定該管件於使用期間之接觸部份的實際尺寸克服此問題。
該注入泵以測量將該管件固持在該接觸區域的物理限制間之距離的至少一感測器操作。該等物理限制可包括一固定不動之表面或壓盤及一運動表面或壓盤,該管件係在其間被壓縮及降壓。特別地是,一方法及對應系統包括以下步驟:將管件載入一夾具;於該夾具的相向表面之間壓縮該管件;當壓縮時接收一指示該管件之壓縮的信號;接收一指示該管件抵靠著該等相向表面之至少一表面的接觸長度之信號;及計算該管件之直徑及厚度。
另一方法及對應系統包括以下步驟:將管件載入一夾具;於該夾具的相向表面之間壓縮該管件;當壓縮時產生及接收一指示該等相向表面間之距離的信號;產生及接收一指示該管件抵靠著該等相向表面之至少一表面的接觸長度之信號;及計算該管件之內徑及厚度。
如所討論之方法與系統係特別很適合用於一注入泵。該注入泵包括一管件夾緊區段,其具有可移動部份及固定不動部份;一第一感測器,其被安裝在該可移動部份或該固定不動部份之一上,用於偵測該可移動部份與該固定不動部份間之距離;至少一個第二感測器,用於以該可移動部份及該固定不動部份之至少一個偵測管件的接觸長度;一進入閥;一排出閥;及一梭動機構,其具有一梭動機構固定不動部份及一梭動機構可移動部份,該二部份被組構成擠壓該梭動機構固定不動部份及該梭動機構可移動部份間之一段長度的管件,其中該梭動機構可移動部份移向該梭動機構固定不動部份及移動遠離該梭動機構固定不動部份,以操作該注入泵。
另一選擇係,該注入泵包括一外殼;一管件夾緊區段,其具有可移動部份及固定不動部份,該管件夾緊區段被安裝在該外殼上;一第一感測器,其被安裝在該可移動部份或該固定不動部份之一上,用於偵測該可移動部份與該固定不動部份間之距離;至少一個第二感測器,用於以該可移動部份及該固定不動部份之至少一個偵測管件的接觸長度;及一正排量泵,用於操縱管件,以精確地輸送一藥劑。
據此,本揭示內容之一優點係提供一用於在決定經由管件注入泵所抽吸之醫療流體體積中補償管件製造變動之系統及方法。
本揭示內容之另一優點係提供一用於在決定經由管件注入泵所抽吸之醫療流體體積中補償管件載入變動之系統及方法。
額外之特色及優點被在此中敘述,且將由以下之實施方式及該等圖面變得明顯。
現在參考該等圖面及特別參考圖1,說明本揭示內容的梭動機構型注入泵50之具體實施例。注入泵50包括管件16、一進入閥52、一排出閥53、及一具有上運動壓盤12與下固定不動壓盤14之梭動部份10。閥門52及53及該梭動部份10係分別藉由線性作動器54a至54c所作動。一注入泵控制器100控制注入泵50及其線性作動器54a至54c,其能以注入泵50之其他處理器、諸如監督處理器及一安全處理器(未示出)操作。
為抽吸流體,作動器54a打開進入閥52。作動器54b關閉排出閥53,且作動器54c縮回壓盤12,允許管件16打開,以例如經由重力接收一液體藥物。作動器54a及54b接著分別造成閥門52及53之狀態顛倒,且作動器54c將壓盤12推向壓盤14,以壓縮管件51,驅散剛才充填壓盤12及14間之管件51的該體積之流體。
如在下面所詳細地討論者,一感測器18、19(例如感測器對)係嵌入運動壓盤12及固定不動壓盤14。一發射器18能被附接至運動壓盤12,而一接收器19係依序附接至固定不動壓盤14。於使用中,當該梭動機構運動壓盤12關閉管件51以抽吸待注入該病人之液體時,該發射器18及接收器19分別送出及接收信號,且如在下面所討論地偵測該對間之距離。同時,一包括複數感測器之感測器陣列24偵測該管件區段與壓盤12及14接觸之長度,亦在下面討論。以此方式,感測器18、19及感測器陣列24偵測及測量該管件之壓縮距離及接觸長度,其被送至控制器100,以計算被真正地抽吸的溶液之精確體積。此感測可為每一注入泵衝程重複。注入泵控制器100接著整合該精確地決定之體積,以調整運動壓盤12之運動的頻率及/或距離,以確保準確性。
現在參考圖2,用於在此中所討論之多數具體實施例,一高階流程圖顯示藉由控制器100所施行之演算法或製程流程圖的一具體實施例。於該製程中,第一步驟101係將該管件載入上面所討論之梭動部份10。一旦被載入,該管件係在步驟102於二相向表面之間壓縮,並以感測器測量該等表面間之距離,且測量該管件及該等表面的至少一表面間之接觸長度。當該測試正發生時,控制器100在步驟103對於信號輸出中之改變監視該等感測器。該等表面之運動可被停止,如在步驟104所視,當在此於該信號中幾乎無改變時。該信號係接著在步驟105被記錄,且控制器100施行計算,以決定該管件之接觸長度、該管件之厚度、及其外徑與內徑,如在步驟106所視。控制器100接著使用該上面之實際尺寸計算真正地被抽吸的液體之體積,並調整未來之抽吸(例如衝程頻率),以造成一實際總體積等於所抽吸之流體的目標總體積。
現在參考圖3A及3B,圖1之注入泵50的梭動部份10被更詳細地顯示,且包括一隨著管件16操作之下壓盤、固定不動壓盤14、及一上運動壓盤12。於所說明之具體實施例中,該下壓盤14係平行於該上運動壓盤12。管件16典型係聚氯乙烯,但亦可為由聚乙烯、聚丙烯、另一醫學上可接受之塑膠、或這些材料的一組合所製成。於圖3A中,在壓縮之前,當最初被放入梭動部份10時,管件16具有一管件厚度t及一外部半徑R0
當該可移動壓盤12被關上時,如圖3B所示,管件16被壓縮。於圖3A及3B兩者中,d係該上及下壓盤12及14間之距離,r係該連續改變管件曲線之半徑,且其中該管件與該等壓盤分開之地點界定該管件與該等壓盤的一切線接觸距離。如藉由管件16的左邊及右邊上之箭頭所示,該管件之長度l與該上及下壓盤12、14界定此接觸距離,且其中長度l之邊緣界定切線釋放點,現在將說明圖3A及3B中所示之方程式。在管件16之側面,該連續改變曲線由該管件接觸下及上壓盤14及12之接觸長度延伸。該等壓盤係彼此平行。如此,該最近形成之曲線係具有半徑r之半圓形,該r係等於該等壓盤間之距離d的一半。每一最近形成之半圓形的曲線長度係等於πr,且兩半圓形或端部之總長度係2πr。關於圖3A所示之方程式表達該下文:該管件16之總外部曲線長度將不會於壓縮期間改變,當該管件16係呈等於2πR0之圓的形狀時,該總外部曲線長度等於其圓周。當該管件被壓縮至如圖1之右側部份所示的一位置時,該總外部曲線長度等於該二最近形成半圓形之長度2πr(或πd)+兩倍該接觸長度l。解決用於R0,該管件之實際半徑,其係看出R0係d/2+l/π。於圖3A中,該管件16係剛好與該等壓盤12、14相線。於此案例中,該二壓盤間之距離d正好是該管件16之外徑2R0。該接觸長度如此係零,且兩倍此長度21亦為零。因此,該管件之圓周係π乘以所測量之距離d、該直徑、等於2πr,或在此情況下為2πR0。該管件的一平面內之面積係π乘以該半徑平方,且該體積係藉由乘以管件之長度或被該注入泵推進的液體之長度所計算。
為藉由此方法測量該管件直徑,該管件理論上能被壓縮至任何位置。如圖3B的方程式區塊2中所顯示,在二不同距離d1及d2取得接觸長度l1、l2。於壓縮步驟期間,接觸長度l1及l2間之差值係與壓盤距離d中之差值成比例的。使用這些對應值,接觸長度l中之變化能藉由壓盤距離d中之變化所決定。此外,當以此方法測量管件直徑時,多數測試能藉由壓縮管件至很多不同位置,且接著使用所有該等計算之平均以獲得一更精確之值被施行。
圖4A至4C描述一典型之狀態,其中當可移動注入泵壓盤12被關上時,管件16被壓縮,擠壓管件16抵靠著下固定不動壓盤14。於此具體實施例中,該等壓盤12、14間之距離d係藉由一超音波感測器(感測器對18與19)所測量,而使一發射器18與頂部壓盤12坐落在一起,及一接收器19與底部壓盤14坐落在一起。很多注入泵業已包括一超音波感測器,其被用作一氣泡混入感測器。很多時候,這預先存在之感測器能被使用於注入泵50之感測器18、19(圖1)。其他具體實施例可使用一電容式感測器、諸如線性可變差分變壓器(“LVDT”)之線性傳感器、或另一距離測量感測器。當上壓盤12被降低時,管件16如在圖4B所視被壓平至一距離d。
當可移動壓盤12被完全地降低時,如圖4C所示,管件16壓縮,使得該等壓盤12、14係僅只藉由該管件16本身分開,且該距離d係該管件壁面之厚度t的兩倍。控制器100能使用感測器18、19,以看出該距離d係不再改變,且決定該管件16被充分地壓縮,如圖4C所視。當壓盤12及14緊密地彼此接近時,甚至在完全壓縮之前,距離感測器18、19顯示該距離d正極緩慢地改變,並僅只藉由該管件本身之厚度所分開,而在其內沒有空氣或液體。如以圖1所討論,作動器54c施加一力量至上壓盤12,以關閉該壓盤抵靠著固定式壓盤14。一力量感測器亦可或另一選擇係被提供及搜尋力量中之增加,以發出圖4C之完全壓縮的信號。作動器54c的一電力或耗電量亦可或另一選擇係被監視,以搜尋耗電量中之增加,指示完全壓縮。
有又另一選擇方式係決定管件壓縮之推進距離、或數量,如圖5A及5B所示。如同先前,梭動部份10包括一運動之上方部份或壓盤12、一底部壓盤14、及管件16。然而在此,壓盤12係藉由一馬達20(例如線性)以一編碼器22推進。該馬達可包括一導螺桿、一滾珠螺桿、螺旋起重機等,以將旋轉式動作轉換至平移動作,以運動壓盤12抵靠著管件16。馬達20及編碼器22係連接至上面所示之控制器100,其提供該控制器100能使用及亦轉換成比率資訊之位置資訊。控制器100控制馬達20及記錄來自編碼器22而關於馬達20之位置的軸桿之資料,且將該位置、或位置中之變化轉換成壓盤12的平移位置中之變化的精確計算。由一習知位置開始,該壓盤12之行程及位置可在任何時刻使用來自該編碼器之資訊、涉及很多地追蹤一重編碼距離d、於管件16之壓縮期間的很多離散時間區段被決定。
圖5A、5B及6顯示一感測器陣列24。感測器陣列24包括分開達一距離l之至少二感測器26。如圖6所示,可有至少二感測器26之一或更多行或列的每一個,每一行或列分開達一距離l,其可為相同或可為不同的,用於很多應用,二感測器26之單一列可為適當的。該二感測器26偵測該等感測器26間之管件16的存在。當該管件16不再與該等感測器26接觸時,該等感測器26將不指示該管件之存在。此狀態可發生該管件與壓盤12及14僅只具有切線接觸點。該等感測器26間之距離l可被設定在該長度,其中當該等壓盤間之距離d係2t時,該管件之邊緣剛好與等感測器接觸。用於一給定之管件組構,以習知之內徑及外徑與壁面厚度,當有一習知之管件壓縮數量時,該等壓盤12、14將被分開達一距離d,該管件之長度抵達長度l,且該管件厚度係大約2t。為設定該距離1,當該等壓盤被分開達一距離d及與該等壓盤接觸之管件16具有厚度2t時,可作測量,且校準資料點用於測量該管件與該等壓盤及感測器接觸之長度l。
當該管件壓抵靠著梭動部份10之壓盤12及14時,該等感測器26之陣列24係能夠偵測該管件之存在。譬如,小巧之壓力感測器、電容式或感應式感測器可被使用。感測器26偵測該上面所顯示之管件16壓平部份的存在。當該管件係僅只切線地接觸該等壓盤時,感測器26將中止偵測管件16之存在。當管件16接觸該感測器時,一壓力感測器26譬如將顯示壓力中之快速上昇或增長。當該壓力被移去時,壓力及該壓力信號之掉落將為同樣快速的。當該管件接近該電容式感測器、例如隔開一習知距離l之二電容式感測器26時,一電容式感測器26將以類似方式操作,具有管件材料、特別是潮濕材料之快速偵測。
除了上面所描述之感測器陣列24以外,有其他方式,其可被用來偵測接觸長度及管件壓縮。圖7A及7B再次描述梭動部份10,其具有一固定不動壓盤14、運動壓盤12、及一段長度之注入泵管件16。於所說明之具體實施例中,一電容式感測器30被安裝在該頂部或運動壓盤12上,且一目標32被安裝在該下、固定不動壓盤14上。當頂部壓盤12被降低進入適當位置以擠壓管件16時,電容式感測器30偵測底部壓盤14上之目標32。使用一電容式感測器可能造成精確偵測注入泵50(圖1)以感測器30之校準。其將被認知於此組構中,其他近接感測器可被使用,例如感應式及超音波感測器。相對注入泵50之操作(圖1),此等近接感測器係小的及不引人注目的。目標32係同樣不引人注目的。譬如,目標32可僅只為被鑄造成壓盤14或位於接近運動壓盤12之注入泵50的本體之另一零件的金屬之小珠粒或四方塊。
用於決定該接觸長度及距離之另一設備及方法被描述在圖8A及8B中。又在此,梭動部份10包括一頂部壓盤12及底部壓盤14,該底部壓盤承接圓形之塑膠管件16。頂部壓盤12係配備有二型式之感測器,即一近接感測器34及二微動開關36。底部壓盤14係配備有一用於近接感測器34的配套之感測物件38。如果近接感測器34係一電容式感測器,醫如,感測物件38係一適合用於藉由電容式感測器所偵測之目標,例如一薄金屬板或導電區域,如果該底部壓盤14係金屬,感應式或電容式感測器能感測壓盤14本身,而沒有一分開之目標。
頂部壓盤12亦包括二微動開關36。該等微動開關係小的極限開關,當該管件16之接觸部份接近(關閉)或離開(管件打開)該頂部壓盤12之底部表面時,其被引發。如此,微動開關36類似於上面所討論之感測器陣列24操作,使該等微動開關間之距離用作該感測器陣列之距離l。再者另一選擇係,一線性可變差分變壓器(“LVDT”)、有時候亦被稱為一線性電壓位移轉換器亦可被用於決定壓盤12及14間之距離d。
參考圖9至11討論關於該等上面圖示所敘述之各種感測器的樣本讀數。於圖9中,近接感測器被用於感測該可移動壓盤12朝向固定不動壓盤14之方式。該方式可不為線性的,且一多少非線性之信號被顯示。然而,當該二壓盤係很接近時,該信號傾向於很小改變。亦即,該距離非線性地改變直至距離24,且於2t及一假想的零距離之間保持恆定。控制器100可因此被組構成搜尋變化Δd至零,以決定該管件16被完全地壓縮。如此,於一具體實施例中,當該近接感測器信號強度係恆定至在某一數量或百分比內時,該2t距離被推論。此型樣譬如對於電容式感測器、感應式感測器、超音波感測器有效。
於圖10中,壓力感測器讀數被揭示。於此具體實施例中,譬如當作感測器陣列24的一部份之壓力感測器讀取一零值,在該相切點d=2r上昇至一很低值,如所示(圖3B)。當壓盤12持續關閉時,當該管件係由d=2r壓縮至d=2t時,該壓力上昇,當抵達該2t距離(管件被壓縮扁平)時,直至一很快速之上昇發生。
圖11描述一微動開關用之讀數,當該管件壓縮該接觸部份時,該微動開關將如所想要地打開或關閉。於所說明之情況中,該開關通常係打開,且當壓盤12關閉時,該開關保持打開,具有一恆定之信號,直至抵達該相切點(d=2r),在此點,該開關被斷開。該開關接著於d=2r及d=2t之間被保持關閉,甚至通過2t之點,直至壓盤12打開與該微動開關被重新設定。
本揭示內容亦涵蓋一狀態,其中管件16不會正好安坐在梭動部份10之中心。譬如,圖12A描述上及下壓盤12、14,其中該管件16係至該左側偏置一距離Δd。感測器26a及26b(例如壓力感測器)將注意該偏置。圖12B顯示分開達距離l的二壓力開關26a及26b之陣列24在不同時間取得該壓力。在此情況下,管件16係偏置至該左側,且左側上之該第一感測器、壓力感測器26a首先在一與藉由在該右側上之感測器26b所偵測的壓力不同之時間及距離偵測該壓力。於圖12C中,如果二插針型微動開關被使用,如於圖8A及8B中,在該右側上之開關36被斷開之前,該左側上之開關36被該管件所斷開。於此案例中,該真正之管件接觸長度將為等於l+Δl,在此l係二感測器(圖12A)間之距離,且Δl係藉由當該左側上之第一感測器偵測壓力之時及當該右側上之第二感測器偵測壓力之時間之時間差異所造成的額外之接觸長度,如圖12D中所示。管件與該壓盤接觸之額外長度係Δl。由當該第一及第二壓力感測器偵測壓力中之急劇上昇時,壓盤距離中之差異Δd可藉由時間中之差異所測量。Δl係接著使用Δd計算,如圖12D中所示。以該總管件接觸長度l+Δl、及該等壓盤間之距離,該管件之直徑能被計算。當然,如果有一藉由該偏置所造成之時間延遲,距離Δd中之變化將被倒轉至接觸長度Δl中之變化。
現在參考圖13,本揭示內容之管件直徑偵測係以用線性蠕動泵60的另一選擇之操作顯示。注入泵60包括一馬達61、一驅動器軸桿62、及複數用於將注入泵桿64壓抵靠著管件65之凸輪板63。該等作動器64壓抵靠著固定不動部份66,由桿至桿連續地擠壓輸液。注入泵60亦包括一額外之凸輪板67。於此具體實施例中,注入泵控制器100控制馬達61、分開之凸輪板67,及由一近接感測器69接收信號。在該注入泵之控制器的命令之下,凸輪板67包括一近接感測器69。當該凸輪板被向前驅策時,近接感測器69感測固定不動部份68中之目標70,其可為固定不動部份66的一部份或可為不同的。固定不動部份68包括長度感測器71,用於感測管件65抵靠著固定不動部份68之接觸長度。微處理器控制器100由該等感測器69、71接收信號,且控制該馬達61、該凸輪板67、及該注入泵之其他部份。
對於一電腦可讀取媒體上之電腦程式,微控制器100亦具有一記憶體,或能存取至一記憶體,該電腦可讀取媒體用於儲存上面所討論之配方,且用於計算該管件之接觸長度及直徑,亦如上面所討論者。由這些讀數及計算,控制器100計算一已被傳送至病人的藥物或輸液之體積。
應了解對在此中所敘述之目前較佳具體實施例的各種變化及修改,對於那些熟諳此技藝者將變得明顯。可作成此等變化及修改,而不會由本主題之精神及範圍脫離,且不會縮減其有意之利益。因此,其係意欲藉由所附申請專利範圍涵蓋此等變化及修改。
10...梭動部份
12...運動壓盤
14...固定不動壓盤
16...管件
18...發射器
19...接收器
20...馬達
22...編碼器
24...感測器陣列
26...感測器
26a...感測器
26b...感測器
30...電容式感測器
32...目標
34...近接感測器
36...微動開關
38...物件
50...注入泵
51...管件
52...進入閥
53...排出閥
54a...線性作動器
54b...線性作動器
54c...線性作動器
60...蠕動泵
61...馬達
62...驅動器軸桿
63...凸輪板
64...注入泵桿
65...管件
66...固定不動部份
67...凸輪板
68...固定不動部份
69...近接感測器
70...目標
71...長度感測器
100...注入泵控制器
圖1係一具有本揭示內容之管件測量系統及方法的梭動機構型注入泵之側視圖。
圖2係一概要流程圖,大概地說明一藉由注入泵控制器所使用之演算法,以施行本揭示內容之管件測量。
圖3A、3B及4A至4C係圖1之梭動機構型注入泵的管件接觸部份之垂直剖面圖,描述管件於一夾具中之壓縮。
圖5A及5B係垂直剖面圖,描述用於測量管件壓縮之設備及方法的一具體實施例。
圖6係一透視圖,說明一用於圖5A及5B的具體實施例中之平面式感測器陣列。
圖7A及7B係垂直剖面圖,描述用於測量二壓盤間之距離的設備及方法之一具體實施例。
圖8A及8B係垂直剖面圖,描述用於測量二壓盤間之距離及該管件與該上壓盤的接觸長度之設備及方法的一具體實施例。
圖9至11係圖解視圖,描述在上面之設備及方法中所取得之感測器讀數。
圖12A至12D係各種視圖,描述一用於校正管件偏置之系統及方法。
圖13描述本揭示內容之管件測量設備及方法的另一選擇凸輪驅動式注入泵具體實施例。
10...梭動部份
12...運動壓盤
14...固定不動壓盤
16...管件
18...發射器
19...接收器
24...感測器陣列
50...注入泵
52...進入閥
53...排出閥
54a...線性作動器
54b...線性作動器
54c...線性作動器

Claims (20)

  1. 一種測量管件之方法,包括:將管件載入一夾具;於該夾具的相向表面之間壓縮該管件;當壓縮時接收一指示該管件之壓縮的信號;接收一指示該管件抵靠著該等相向表面之至少一表面的接觸長度之信號;及計算該管件之直徑及厚度。
  2. 如申請專利範圍第1項的測量管件之方法,另包括監視指示該管件之壓縮的信號、或指示該接觸長度之信號。
  3. 如申請專利範圍第1項的測量管件之方法,其中指示該管件之壓縮的信號係該夾具的相向表面間之距離的指示。
  4. 如申請專利範圍第1項的測量管件之方法,其中指示該管件之壓縮的信號係藉由線性可變差分變壓器(LVDT)、超音波感測器、氣泡混入(air-in-line)感測器、或電容式感測器所產生。
  5. 如申請專利範圍第1項的測量管件之方法,其中指示該接觸長度之信號係藉由感測器、壓力感測器、感測器陣列、開關陣列、或電容式感測器所產生。
  6. 如申請專利範圍第1項的測量管件之方法,其中該等相向表面係注入泵的一部份。
  7. 如申請專利範圍第1項的測量管件之方法,其中該 計算步驟使用二個半圓及管件與該等相向表面之接觸長度來計算該管件之直徑。
  8. 如申請專利範圍第1項的測量管件之方法,其包括:產生及接收指示該管件之壓縮的信號;及產生及接收指示該管件之接觸長度的信號。
  9. 如申請專利範圍第1項的測量管件之方法,其中該計算步驟包括計算該管件之內徑。
  10. 如申請專利範圍第9項的測量管件之方法,另包括使用所計算之內徑計算液體輸液(infusate)之體積。
  11. 一種注入泵,其採用根據申請專利範圍第1至10項任一項之方法,該注入泵包括:一進入閥;一排出閥;一梭動機構,其包括一梭動機構固定不動部份及一梭動機構可移動部份,該梭動機構固定不動部份及該梭動機構可移動部份被組構成擠壓該梭動機構固定不動部份及該梭動機構可移動部份間之一段長度的管件,其中該梭動機構可移動部份移向該梭動機構固定不動部份及移動遠離該梭動機構固定不動部份,以操作該注入泵;一第一感測器,其安裝在該梭動機構可移動部份及該梭動機構固定不動部份中之一者上,用於偵測該梭動機構可移動部份與該梭動機構固定不動部份間之距離;及至少一個第二感測器,用於偵測管件與該梭動機構可 移動部份及該梭動機構固定不動部份之至少一個的接觸長度。
  12. 如申請專利範圍第11項之注入泵,其中該第一感測器包括LVDT、超音波感測器、氣泡混入感測器、或電容式感測器。
  13. 如申請專利範圍第11項之注入泵,其中該第二感測器包括感測器、壓力感測器、感測器陣列、開關陣列、或電容式感測器。
  14. 如申請專利範圍第11至13項任一項之注入泵,另包括一目標,該目標安裝在該梭動機構可移動部份及該梭動機構固定不動部份中的不包括該第一感測器之一者上。
  15. 一種注入泵,其採用根據申請專利範圍第1至10項任一項之方法,該注入泵包括:一正排量泵,用於操縱管件,以精確地輸送一藥劑;一第一感測器,其安裝在該正排量泵的可移動部份或固定不動部份之一上,用於偵測該可移動部份與該固定不動部份間之距離;及至少一個第二感測器,用於偵測管件與該可移動部份及該固定不動部份之至少一個的接觸長度。
  16. 如申請專利範圍第15項之注入泵,其中該正排量泵係一梭動機構泵或一蠕動泵。
  17. 如申請專利範圍第15項之注入泵,其中該第一感測器係一氣泡混入感測器或一近接感測器。
  18. 如申請專利範圍第15項之注入泵,其中該至少一個第二感測器包括二隔開之感測器或微動開關。
  19. 如申請專利範圍第15項之注入泵,另包括在一電腦可讀取碟片上之電腦程式,用於計算該管件之長度及直徑。
  20. 如申請專利範圍第15項與第17至19項任一項之注入泵,其中該注入泵係一線性蠕動泵,且該可移動部份係複數凸輪板之一。
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